Title of Invention	ASSEMBLY ARRANGEMENT BETWEEN A BEARING INNER RACE AND A JOURNAL
Abstract	The assembly arrangement between an inner race 6 of a bearing and a journal 2 supported in rotation in this bearing comprises: - a journal annular groove 36 and a race annular groove 26 which interact to form an annular channel 52 when they are placed opposite one another, - a retaining ring 40 placed in the said annular channel 52, which prevents a relative movement in translation between the said journal 2 and the said inner race 6, and - at least one recess 38 of the said journal 2 and at least one tooth 32 of the said inner race 6, which interact to prevent a relative movement in rotation between the said journal 2 and the said inner race 6.

Title of Invention

ASSEMBLY ARRANGEMENT BETWEEN A BEARING INNER RACE AND A JOURNAL

Abstract

The assembly arrangement between an inner race 6 of a bearing and a journal 2 supported in rotation in this bearing comprises: - a journal annular groove 36 and a race annular groove 26 which interact to form an annular channel 52 when they are placed opposite one another, - a retaining ring 40 placed in the said annular channel 52, which prevents a relative movement in translation between the said journal 2 and the said inner race 6, and - at least one recess 38 of the said journal 2 and at least one tooth 32 of the said inner race 6, which interact to prevent a relative movement in rotation between the said journal 2 and the said inner race 6.

Full Text	ORIGINAL 9 The present invention relates to assembly arrangement between a bearing inner race and a journal, race and journal suitable for such an arrangement, and turbomachine fitted therewith .-• • . 1 • •, Field of the Invention " . * The' present invention relates to the assembly between an inner race of a bearing and a journal guided in 10 rotation by this bearing. It is aimed at an assembly arrangement making it. possible to assemble the inner race and the journal. V.' It is aimed at a bearing inner race suitable for such • , an assembly arrangement, and a journal suitable for such an assembly arrangement. . Finally it is aimed at a turbomachine fitted with such 2(',- a bearing inner race and/or such a journal and/or ..fitted with such an assembly arrangement. Background of the Invention ' 2t In all of the following, the term "journal" will be used which must be understood as being any' similar'part or belonging to a rotating shaft. Figures 2 and 3 illustrate, schematically and in axial 3( section, respectively two known arrangements of the assembly between a journal and a bearing inner race. In these two examples, the bearing is a roller bearing. "Axial section" means a section taken along the 3,1 longitudinal axis, of the journal. In these tw6 figures,, similar elements bear similar reference.numbers. Reference number 102 indicates a journal having an axis ^ 104. The journal 102 is supported by a bearing having a bearing inner race 106 and a bearing, outer race 108. Between the bearing inner race 106 and the bearing 5 "outer race 108 there are rollers 110. The bearing outer race is attached to.a fixed part 112. The bearing inner race 106 is attached to the journal 102. Figure 2 illustrates an assembly arrangement in which ' 13 the bearing inner race 106 is attached to an end of the journal 102 by means of a weld 116. The bearing inner race 106 forms here an extension of (' ,, , the journal 102. In other words, this configuration is 15 similar to a configuration in which the rollers 110 would be directly incorporated into the journal 102. Such an, assembly arrangement by welding has, disadvantages. Specifically, the bearing inner race 106 2) and the journal 102 are made of different materials. It ' is often difficult to make a firm weld between two' parts made of different materials. In addition, when . > such a weld is made, the lifetime of the assembly is not always satisfactory. 2 5 Figure 3 illustrates an assembly arrangement in which the bearing inner race 106 is mounted by being clamped .axially against a shoulder 118 of the journal 102, and , attached by means of a clamping nut 120. An anti- 3) rotation device 122 associated with the clamping nut 120 prevents rotation of the latter relative to the journal 102. Such a mechanical assembly . by clamping nut does not 3) have - the disadvantage specific to an assembly by weldirig. However it has, another disadvantage linked to the bulk of the assembly. Specifically, in turbomachines designed to receive such assemblies, it ' 3 - '. is increasingly necessary to limit the axial length of j ^ ^ the journal or of the rotating shaft. The presence of the clamping nut 120 and its anti-rotation device 122 placed at the end of the journal 102 beyond the bearing ,) inner race 106, requires the axial length of the journal 102 to be greater than the axial length of a journal 102 suitable for an assembly by welding. An object of the present invention is to provide an • i I') assembly arrangement of an inner race and a journal . . that does not have the aforementioned disadvantages. More precisely, an object of the present invention is ( to provide an assembly arrangement that is mechanical 1,)'. and that does not require an increase in. the axial .length of the journal. In everything that follows, the "bearing inner race", .respectively the "bearing outer race", will simply be 2) called "inner race", respectively "outer race". Summary of the Invention According to a first aspect, the invention relates to- . ' ;, 2) an assembly arrangement between an inner race of a .' bearing and a journal supported in rotation in this bearing, the journal having an axis. This bearing arrangement comprises-. 3] - a journal annular groove made on an outer face of the journal and a race annular groove made on an inner face ' of the inner race,, the two annular grooves interacting to form an annular channel between the journal and the inner face when they are placed opposite one another, j. - a retaining ring placed in the annular channel,, which prevents a relative movement, in translation along the , axis of the journal, between the journal and the inner • A race, and - at least one recess of the said journal and at least ;i one tooth of the said inner race, which interact to prevent a relative movement, in rotation about the axis of the journal, between the journal and the inner race. Each tooth extends radially inwards from the inner face 1(1 of the inner race. The at least one recess may be a blind hole of the ' -journal. The at, least one recess may be a longitudinal ( groove of the journal. !:> Preferably, the assembly arrangement comprises at least . , one opening connecting the race annular groove to an • , .• outer face of the inner race. 2) Preferably, the retaining ring is furnished with a split to make it easier to insert in the annular channel. • _ Preferably, the journal annular groove and the at least 2 5 one recess are placed either side of at least one oil duct which opens onto an outer face of the journal and which carries oil to the inner race through the j ournal. ' 3} In addition, the. a-ssembly arrangement comprises a bevel of the inner race, in the vicinity of the race annular groove. Optionally, the assembly arrangement comprises a race 35 radial shoulder and a journal radial shoulder which • interact to produce an axial abutment of the inner race on the journal. According to a second aspect, the invention relates to ^ a bearing inner race suitable for an assembly arrangement between this inner race and a journal, ^ according to a first aspect of the invention. The ,) journal has an .axis. This race comprises: - a race body designed to interact with a bearing outer race, 1() - a first race end comprising first race assembly means • to prevent a relative movement, in translation along the axis of the journal, between the journal and the inner race, and - ( , . !;[ - a second race end comprising second- race assembly means for preventing a relative movement, in rotation about the axis of the journal, between the journal- and the inner race . .^ t 2) The first race assembly means comprise a race annular • groove made on an inner face of the inner race. The first race assembly means also comprise -a bevel made at the extremity of the first race end, on an 2) inner face of the inner race and in the vicinity of the race annular groove. The first race assembly means also comprise at least one opening connecting the race annular groove .to an 3) outer face of the inner race. The second race ' assembly means comprise at least one tooth extending radially inwards at the extremity of the second race end. 3) ' Optionally, the bearing inner race comprises a race radial shoulder between the r&ce body and the first race end. ^ According to a third aspect, the invention relates to a journal suitable for an assembly arrangement between . •. ; . this inner race and a journal, according to the first . :i aspect of the invention. The journal has an axis. It comprises: - first journal assembly means for preventing a relative movement, in translation along the axis of. the . 10 journal, between the journal and the inner race, and • ' - second journal assembly means for preventing a relative movement, in rotation about the axis of the ( journal, between the journal and the inner race. The first journal assembly means comprise a. journal annular groove made on an outer-face of the journal. The second journal assembly means comprise at least one 20 recess made in the journal. Each recess may be, for example, a blind hole of the journal, or else a longitudinal groove of the journal. ;. ';, 2) Optionally, the journal comprises a journal radial '• shoulder. Preferably, the journal comprises at least one oil duct which opens onto an outer face of the said journal 3) between the said first journal \assembly means and the said second journal assembly means. According to a fourth aspect, the invention relates to • a turbomachine, in particular an aircraft engine, 3) fitted with a'n assembly arrangement according to the •first aspect, or with a bearing inner race according to the second aspect, or with a journal according to the, third.aspect. g^ The assembly arrangement according to the invention is • an inner race on a journal towards an end of the . ) latter. It is of particular value when the desire is to • reduce the axial, dimension of the journal. This is particularly the case when the- end of the journal is close to another part and the user desires to prevent , any collision or any contact between them during the 1) operation of the turbomachine. ( • Brief Description of the Drawings > ' " I) • • The invention will be better understood on reading the following detailed description of embodiments of the ; invention, given as illustrations and in no way . '. \ . limiting,, with reference to the appended drawings, in 2) which: . . - Figure 1 illustrates schematically and in axial section an embodiment of an assembly arrangement between an inner race and a journal, according to the 25 invention; - Figure 2, already described, illustrates schematically and in axial section a first known assembly arrangement between an inner race and a 3 3 j ournal; ,. - Figure 3, already described, illustrates schematically and in axial' section a second known assembly arrangement between an inner race and a 3 5' journal. Description of Preferred Embodiments • • • with reference to Figure 1, an assembly arrangement is ^ shown according to the invention. A journal 2 having an. axis 4 is supported in rotation by a bearing which comprises an inner race 6 and an outer race 8. In the ' .5 example illustrated, the bearing is a roller bearing,, and rollers 10 are placed between the outer race 8 and the inner race 6. The bearing outer race 108 is attached to a fixed part 13 12. . . The inner race 6 comprises a race body 60, which interacts with the outer race 8 via the rollers 10 to I provide the rolling action. It also comprises a first 15 race end 62 and a second race end 64,. which are annular parts extending either side of. the race body 60 in the axial direction.. It further comprises a race inner face 66 and a race outer face 68. 2 3 The journal 2 comprises an axis 4, a journal outer.face 24 and a journal end 50. The journal 2 and the inner race 6 are assembled; together by means of first race assembly means 26, 28, 25 30, second race assembly means 32, first journal • assembly means 36, second journal assembly means 3 8 and additional assembly means 40. The first race assembly means 26, 28, 3 0 comprise a 3 3 race annular groove 26 made on the race inner face 66, at the first race end 62. The first race assembly means 26, 28, 30 also comprise a bevel 2 8 made on the race inner face 66, at the 3 5 extremity of the first race end 62 and in the vicinity of the race annular groove 26. • — • " T S ' ' The first race assembly means 26, 28, 30 further ^ comprise at least one opening 30 which traverses the I inner race 6 radially. Each opening 3 0 connects the : race annular groove 2 6 and the race outer face 68. When 5 several • openings 3 0 are present, they can be ' • distributed radially on the inner race 6. - The second race assembly means 32 comprise at least one tooth 32, extending radially inwards from the race 1) inner face 66 at the second race end 64. It may _ be a ' single tooth 32 or a plurality of teeth 32 substantially distributed over a circumference of the race inner face 66, for example equidistant from one ( another. - ' ^ , 1 5 ' ' .,,;': 5; The first journal assembly means 3 6 comprise a journal annular groove 36 made on the journal outer face 24. The. second journal assembly means 38 comprise at least ' • 2): one; recess 38 of the journal 2. This may be a single recess 38, or else a plurality of recesses 38 substantially distributed over a circumference of the journal outer face 24, for example equidistant from one another. 25 Each recess 38 may be, for example, a blind hole machined in the journal 2, or else a longitudinal . groove machined in the journal 2. 3)' Optionally, the inner race comprises a race shoulder 3,4 extending radially between the race body 60 and the' first race end 62, and the journal comprises a journal shoulder 18 extending radially. In the example illustrated, the race shoulder 34 extends radially 3) inwards and the journal shoulder 18 extends radially outwards. The assembly arrangement comprises additional assembly •' '^ , means 40 which comprise a retaining ring 40. When the assembly between the inner race 6 and the ,'.' journal 2 is made, the race inner face 66 is opposite the journal outer face 24. When the assembly between the inner race 6 and the . . journal 2 . is made, each tooth 3 2 and the inner race 6 10 -are engaged with a corresponding recess 3 8 of the journal 2. Thanks to the interaction of the teeth 32 and the recesses 38, the inner race 6 and the journal 2 are prevented from moving in axial rotation relative to ( one another. l : i ' • _ When the assembly between the inner race 6 and the journal 2 is made, the race annular groove 2 6 and the journal annular groove 3 6 interact to form an annular channel 52 into which the retaining .ring 40 is 20 inserted. Thanks to the inte raction between the I retaining ring 4 0 and the annular channel 52, the inner race 6 and the journal 2 are prevented from moving in ^ axial translation relative to one another. ,2.) In addition, the journal 2 is furnished with at least one journal oil duct 46, placed between the journal / • , annular groove 36 and the at least one recess 38, which , , opens onto the journal outer face 24 in order to carry ','• oil to the inner race 6 through the journal 2. Equally, 30 the inner race 6 is furnished with race oil ducts ,48, which traverse it radially, in order to carry oil to the rollers 10. Mounting the assembly arrangement comprises the two 3.) operations described below. During a first operation, the retaining ring 40 is "; ' inserted into the journal annular groove 36. - IfPreferably, the retaining ring 40 is furnished with a ^ split , (not shown) to make it easier to insert in the , journal annular groove 36. This split may be oriented ;, ' i n the radial direction of the retaining ring 40, or it :i may be oblique to this radial direction. • During a second operation, the inner race 6 is inserted : onto the journal 2 via the journal end 50. The presencfe of the bevel 2 8 on the inner race 6 makes it easier to ' , 1(1 engage the inner race 6 over the retaining ring 40. • , When the inner ra^ce 6 and the journal 2 are furnished . with respective shoulders 34 and 18, the latter are in ( contact against one another and serve as axial abutment 'l:i to the inner race 6 on the journal 2 in the direction • of insertion. In operation, the rotation causes an expansion of the "retaining ring 40 which presses against the race 2) annular groove 26. Dismantling the assembly arrangement comprises the following operation: the retaining ring 4 0 is retracted from the journal annular groove 3 6 by means of an 2) appropriate tool. For example, a tool, comprising pins or lugs that penetrate into the openings 3 0 of the inner race 6 and push out the retaining ring 40, :may be used. Simultaneously, the inner race 6 is wit'hdrawn from the journal 2 in the direction of the journal end 3) 50. _ _ — — ^ • • —-^ ,. ORIGINAL w We claim: 1. An assembly arrangement between an inner race (6) of a bearing and a journal (2) supported in rotation in said bearing, said journal (2) having an axis (4), wherein said assembly arrangement comprises: a journal annular groove (36) made on an outer face (24) of said journal (2) and a race annular groove (26) made on an inner face (66) of said inner race (6), said two annular grooves interacting to form an annular channel (52) between said journal (2) and said inner face (66) when the two annular grooves are placed opposite one another, a retaining ring (40) placed in said annular channel (52), which prevents a relative movement, in translation along said axis (4), between said journal (2) and said inner race (6), and at least one recess (38) of said journal (2) and at least one tooth (32) of said inner race (6), which interact to prevent a relative movement, in rotation about said axis (4), between said journal (2) and said inner race (6). 2. An assembly arrangement as claimed in claim 1, wherein each tooth (32) extends radially inwards from the inner face (66) of the inner race (6). 3. An assembly arrangement as claimed in claim 1, wherein each recess (38) consists of a blind hole of the journal (2). 4. An assembly arrangement as claimed in claim 1, wherein each recess (38) consists of a longitudinal groove of the journal (2). 5. An assembly arrangement as claimed in claim 1, fiirther comprising at least one opening (30) cormecting said race annular groove (26) to an outer face (24) of said inner race (6). 6. An assembly arrangement as claimed in claim 1, wherein said retaining ring (40) includes a split oriented so as to facilitate insertion of said retaining ring (40) in said annular channel (52). 7. An assembly arrangement as claimed in claim 1, wherein said journal (2) annular groove (26) and said at least one recess (38) are placed either side of at least one oil duct which opens W onto an outer face (24) of the journal (2) and carries oil to said inner race (6) through said journal (2). 8. An assembly arrangement as claimed in claim 1, further comprising a bevel of the inner race (6), in the vicinity of the race annular groove (26). 9. An assembly arrangement as claimed in claim 1, further comprising a race radial shoulder and a journal radial shoulder, which interact to produce an axial abutment of said inner race (6) on said journal (2). 10. An assembly arrangement as claimed in claim 1 wherein said inner race (6) comprises: a race body (60) designed to interact with a bearing outer race, a first race end (62) comprising first race assembly means for preventing a relative movement, in translation along the said axis (4), between said journal (2) and said inner race (6), and a second race end (64) comprising second race assembly means for preventing a relative movement, in rotation about said axis (4), between said journal (2) and said inner race (6). 11. An assembly arrangement as claimed in claim 10, wherein said first race assembly means comprise a race annular groove (26) made on an inner face (66) of said irmer race (6). 12. An assembly arrangement as claimed in claim 11, wherein the first race assembly means comprise a bevel made at the extremity of said first race end (62), on an inner face (66) of said inner race (6) and in the vicinity of said race annular groove (26). 13. An assembly arrangement as claimed in claim 10, wherein said first race assembly means comprise at least one opening connecting said race annular groove (26) to an outer face (24) of the said inner race (6). 14. An assembly arrangement as claimed in claim 10, wherein said second race assembly means comprise at least one tooth (32) extending radially inwards at the extremity of the second race end (64). 15. An assembly arrangement as claimed in claim 10, further comprising a race radial shoulder between the race body (60) and the first race end (62). 16. A turbomachine comprising the bearing, the journal (2), and the assembly arrangement as claimed in claim 10 wherein the assembly arrangement is between the inner race (6) of the bearing and the journal (2) is supported in rotation in said bearing. 17. An assembly arrangement as claimed in claim 1 wherein said journal (2) comprises: first journal assembly means (36) for preventing a relative movement, in translation along the said axis (4), between said journal (2) and said inner race (6), and second journal assembly means (38) for preventing a relative movement, in rotation about said axis (4), between said journal (2) and said inner race (6). 18. An assembly arrangement as claimed in claim 17, wherein said first journal assembly means (36) comprise a journal annular groove (36) made on an outer face (24) of said journal (2). 19. An assembly arrangement as claimed in claim 17, wherein said second journal assembly means (38) comprising at least one recess (38) made in said journal (2). 20. An assembly arrangement as claimed in claim 19, wherein each recess (38) consist in a blind hole of the journal (2). 21. An assembly arrangement as claimed in claim 19, wherein each recess (38) consists of a longitudinal groove of the j oumal (2). 22. An assembly arrangement as claimed in claim 17, further comprising a journal radial shoulder configured to interact with a race radial shoulder to produce an axial abutment of said inner race (6) on said journal (2). • 23. An assembly arrangement as claimed in claim 17, further comprising at least one oil duct which opens onto an outer face (24) of said journal (2), said oil duct being placed between said first journal assembly means (36) and said second journal assembly means (38). 24. A turbomachine comprising the bearing, the journal (2), and the assembly arrangetaent as claimed in claim 17, wherein the assembly arrangement is between the inner race (6Jofthe bearing and the journal (2) is supported in rotation in said bearing. 25. A turbomachine comprising the bearings the journal (2), and the assembly arrangement as claimed in claim 1, wherein the assembly arrangement is between the inner race (6) of the bearing and the journal (2) is supported in rotation in said bearing. Dated this 13/04/2006 \A ^ V V v • I JAYANTA PAL] OFREfpRY&SAGAR ATTORNEY F W THE APPLICANT[S] i

Full Text

ORIGINAL
9 The present invention relates to assembly arrangement between a bearing inner race and a
journal, race and journal suitable for such an arrangement, and turbomachine fitted therewith
.-• • . 1 • •,
Field of the Invention
" . *
The' present invention relates to the assembly between
an inner race of a bearing and a journal guided in
10 rotation by this bearing.
It is aimed at an assembly arrangement making it.
possible to assemble the inner race and the journal.
V.' It is aimed at a bearing inner race suitable for such • ,
an assembly arrangement, and a journal suitable for
such an assembly arrangement. .
Finally it is aimed at a turbomachine fitted with such
2(',- a bearing inner race and/or such a journal and/or
..fitted with such an assembly arrangement.
Background of the Invention '
2t In all of the following, the term "journal" will be
used which must be understood as being any' similar'part
or belonging to a rotating shaft.
Figures 2 and 3 illustrate, schematically and in axial
3( section, respectively two known arrangements of the
assembly between a journal and a bearing inner race. In
these two examples, the bearing is a roller bearing.
"Axial section" means a section taken along the
3,1 longitudinal axis, of the journal. In these tw6 figures,,
similar elements bear similar reference.numbers.
Reference number 102 indicates a journal having an axis
^ 104. The journal 102 is supported by a bearing having a
bearing inner race 106 and a bearing, outer race 108.
Between the bearing inner race 106 and the bearing
5 "outer race 108 there are rollers 110. The bearing outer
race is attached to.a fixed part 112. The bearing inner
race 106 is attached to the journal 102.
Figure 2 illustrates an assembly arrangement in which '
13 the bearing inner race 106 is attached to an end of the
journal 102 by means of a weld 116.
The bearing inner race 106 forms here an extension of
(' ,, , the journal 102. In other words, this configuration is
15 similar to a configuration in which the rollers 110
would be directly incorporated into the journal 102.
Such an, assembly arrangement by welding has,
disadvantages. Specifically, the bearing inner race 106
2) and the journal 102 are made of different materials. It '
is often difficult to make a firm weld between two'
parts made of different materials. In addition, when
. > such a weld is made, the lifetime of the assembly is
not always satisfactory.
2 5
Figure 3 illustrates an assembly arrangement in which
the bearing inner race 106 is mounted by being clamped
.axially against a shoulder 118 of the journal 102, and ,
attached by means of a clamping nut 120. An anti-
3) rotation device 122 associated with the clamping nut
120 prevents rotation of the latter relative to the
journal 102.
Such a mechanical assembly . by clamping nut does not
3) have - the disadvantage specific to an assembly by
weldirig. However it has, another disadvantage linked to
the bulk of the assembly. Specifically, in
turbomachines designed to receive such assemblies, it
' 3 -
'. is increasingly necessary to limit the axial length of
j ^ ^ the journal or of the rotating shaft. The presence of
the clamping nut 120 and its anti-rotation device 122
placed at the end of the journal 102 beyond the bearing
,) inner race 106, requires the axial length of the
journal 102 to be greater than the axial length of a
journal 102 suitable for an assembly by welding.
An object of the present invention is to provide an •
i
I') assembly arrangement of an inner race and a journal .
. that does not have the aforementioned disadvantages.
More precisely, an object of the present invention is
( to provide an assembly arrangement that is mechanical
1,)'. and that does not require an increase in. the axial
.length of the journal.
In everything that follows, the "bearing inner race",
.respectively the "bearing outer race", will simply be
2) called "inner race", respectively "outer race".
Summary of the Invention
According to a first aspect, the invention relates to- . ' ;,
2) an assembly arrangement between an inner race of a .'
bearing and a journal supported in rotation in this
bearing, the journal having an axis. This bearing
arrangement comprises-.
3] - a journal annular groove made on an outer face of the
journal and a race annular groove made on an inner face '
of the inner race,, the two annular grooves interacting
to form an annular channel between the journal and the
inner face when they are placed opposite one another,
j. - a retaining ring placed in the annular channel,, which
prevents a relative movement, in translation along the ,
axis of the journal, between the journal and the inner
• A race, and
- at least one recess of the said journal and at least
;i one tooth of the said inner race, which interact to
prevent a relative movement, in rotation about the axis
of the journal, between the journal and the inner race.
Each tooth extends radially inwards from the inner face
1(1 of the inner race.
The at least one recess may be a blind hole of the
' -journal. The at, least one recess may be a longitudinal
( groove of the journal.
!:>
Preferably, the assembly arrangement comprises at least . ,
one opening connecting the race annular groove to an • , .•
outer face of the inner race.
2) Preferably, the retaining ring is furnished with a
split to make it easier to insert in the annular
channel. • _
Preferably, the journal annular groove and the at least
2 5 one recess are placed either side of at least one oil
duct which opens onto an outer face of the journal and
which carries oil to the inner race through the
j ournal. '
3} In addition, the. a-ssembly arrangement comprises a bevel
of the inner race, in the vicinity of the race annular
groove.
Optionally, the assembly arrangement comprises a race
35 radial shoulder and a journal radial shoulder which
•
interact to produce an axial abutment of the inner race
on the journal.
According to a second aspect, the invention relates to
^ a bearing inner race suitable for an assembly
arrangement between this inner race and a journal,
^ according to a first aspect of the invention. The
,) journal has an .axis. This race comprises:
- a race body designed to interact with a bearing outer
race,
1() - a first race end comprising first race assembly means
• to prevent a relative movement, in translation along
the axis of the journal, between the journal and the
inner race, and -
( ,
. !;[ - a second race end comprising second- race assembly
means for preventing a relative movement, in rotation
about the axis of the journal, between the journal- and
the inner race . .^
t
2) The first race assembly means comprise a race annular •
groove made on an inner face of the inner race.
The first race assembly means also comprise -a bevel
made at the extremity of the first race end, on an
2) inner face of the inner race and in the vicinity of the
race annular groove.
The first race assembly means also comprise at least
one opening connecting the race annular groove .to an
3) outer face of the inner race.
The second race ' assembly means comprise at least one
tooth extending radially inwards at the extremity of
the second race end.
3) '
Optionally, the bearing inner race comprises a race
radial shoulder between the r&ce body and the first
race end.
^ According to a third aspect, the invention relates to a
journal suitable for an assembly arrangement between
. •. ; . this inner race and a journal, according to the first
. :i aspect of the invention. The journal has an axis. It
comprises:
- first journal assembly means for preventing a
relative movement, in translation along the axis of. the
. 10 journal, between the journal and the inner race, and • '
- second journal assembly means for preventing a
relative movement, in rotation about the axis of the
( journal, between the journal and the inner race.
The first journal assembly means comprise a. journal
annular groove made on an outer-face of the journal.
The second journal assembly means comprise at least one
20 recess made in the journal.
Each recess may be, for example, a blind hole of the
journal, or else a longitudinal groove of the journal. ;. ';,
2) Optionally, the journal comprises a journal radial '•
shoulder.
Preferably, the journal comprises at least one oil duct
which opens onto an outer face of the said journal
3) between the said first journal \assembly means and the
said second journal assembly means.
According to a fourth aspect, the invention relates to •
a turbomachine, in particular an aircraft engine,
3) fitted with a'n assembly arrangement according to the
•first aspect, or with a bearing inner race according to
the second aspect, or with a journal according to the,
third.aspect.
g^ The assembly arrangement according to the invention is • an inner race on a journal towards an end of the .
) latter. It is of particular value when the desire is to
• reduce the axial, dimension of the journal. This is
particularly the case when the- end of the journal is
close to another part and the user desires to prevent
, any collision or any contact between them during the
1) operation of the turbomachine.
( • Brief Description of the Drawings >
' " I) • •
The invention will be better understood on reading the
following detailed description of embodiments of the ;
invention, given as illustrations and in no way . '. \ .
limiting,, with reference to the appended drawings, in
2) which: . .
- Figure 1 illustrates schematically and in axial
section an embodiment of an assembly arrangement
between an inner race and a journal, according to the
25 invention;
- Figure 2, already described, illustrates
schematically and in axial section a first known
assembly arrangement between an inner race and a
3 3 j ournal; ,.
- Figure 3, already described, illustrates
schematically and in axial' section a second known
assembly arrangement between an inner race and a
3 5' journal.
Description of Preferred Embodiments
• • •
with reference to Figure 1, an assembly arrangement is
^ shown according to the invention. A journal 2 having an.
axis 4 is supported in rotation by a bearing which
comprises an inner race 6 and an outer race 8. In the '
.5 example illustrated, the bearing is a roller bearing,,
and rollers 10 are placed between the outer race 8 and
the inner race 6.
The bearing outer race 108 is attached to a fixed part
13 12. . .
The inner race 6 comprises a race body 60, which
interacts with the outer race 8 via the rollers 10 to
I provide the rolling action. It also comprises a first
15 race end 62 and a second race end 64,. which are annular
parts extending either side of. the race body 60 in the
axial direction.. It further comprises a race inner face
66 and a race outer face 68.
2 3 The journal 2 comprises an axis 4, a journal outer.face
24 and a journal end 50.
The journal 2 and the inner race 6 are assembled;
together by means of first race assembly means 26, 28,
25 30, second race assembly means 32, first journal •
assembly means 36, second journal assembly means 3 8 and
additional assembly means 40.
The first race assembly means 26, 28, 3 0 comprise a
3 3 race annular groove 26 made on the race inner face 66,
at the first race end 62.
The first race assembly means 26, 28, 30 also comprise
a bevel 2 8 made on the race inner face 66, at the
3 5 extremity of the first race end 62 and in the vicinity
of the race annular groove 26.
• — • " T S '
' The first race assembly means 26, 28, 30 further
^ comprise at least one opening 30 which traverses the
I inner race 6 radially. Each opening 3 0 connects the
: race annular groove 2 6 and the race outer face 68. When
5 several • openings 3 0 are present, they can be ' •
distributed radially on the inner race 6.
- The second race assembly means 32 comprise at least one
tooth 32, extending radially inwards from the race
1) inner face 66 at the second race end 64. It may _ be a '
single tooth 32 or a plurality of teeth 32
substantially distributed over a circumference of the
race inner face 66, for example equidistant from one
( another. - '
^ , 1 5 ' ' .,,;': 5;
The first journal assembly means 3 6 comprise a journal
annular groove 36 made on the journal outer face 24.
The. second journal assembly means 38 comprise at least ' •
2): one; recess 38 of the journal 2. This may be a single
recess 38, or else a plurality of recesses 38
substantially distributed over a circumference of the
journal outer face 24, for example equidistant from one
another.
25
Each recess 38 may be, for example, a blind hole
machined in the journal 2, or else a longitudinal .
groove machined in the journal 2.
3)' Optionally, the inner race comprises a race shoulder 3,4
extending radially between the race body 60 and the'
first race end 62, and the journal comprises a journal
shoulder 18 extending radially. In the example
illustrated, the race shoulder 34 extends radially
3) inwards and the journal shoulder 18 extends radially
outwards.
The assembly arrangement comprises additional assembly •'
'^ , means 40 which comprise a retaining ring 40.
When the assembly between the inner race 6 and the
,'.' journal 2 is made, the race inner face 66 is opposite
the journal outer face 24.
When the assembly between the inner race 6 and the
. . journal 2 . is made, each tooth 3 2 and the inner race 6
10 -are engaged with a corresponding recess 3 8 of the
journal 2. Thanks to the interaction of the teeth 32
and the recesses 38, the inner race 6 and the journal 2
are prevented from moving in axial rotation relative to
( one another.
l : i ' • _
When the assembly between the inner race 6 and the
journal 2 is made, the race annular groove 2 6 and the
journal annular groove 3 6 interact to form an annular
channel 52 into which the retaining .ring 40 is
20 inserted. Thanks to the inte raction between the I
retaining ring 4 0 and the annular channel 52, the inner
race 6 and the journal 2 are prevented from moving in ^
axial translation relative to one another.
,2.) In addition, the journal 2 is furnished with at least
one journal oil duct 46, placed between the journal / •
, annular groove 36 and the at least one recess 38, which , ,
opens onto the journal outer face 24 in order to carry ','•
oil to the inner race 6 through the journal 2. Equally,
30 the inner race 6 is furnished with race oil ducts ,48,
which traverse it radially, in order to carry oil to
the rollers 10.
Mounting the assembly arrangement comprises the two
3.) operations described below.
During a first operation, the retaining ring 40 is "; '
inserted into the journal annular groove 36.
- IfPreferably,
the retaining ring 40 is furnished with a
^ split , (not shown) to make it easier to insert in the
, journal annular groove 36. This split may be oriented ;,
' i n the radial direction of the retaining ring 40, or it
:i may be oblique to this radial direction. •
During a second operation, the inner race 6 is inserted :
onto the journal 2 via the journal end 50. The presencfe
of the bevel 2 8 on the inner race 6 makes it easier to ' ,
1(1 engage the inner race 6 over the retaining ring 40. • ,
When the inner ra^ce 6 and the journal 2 are furnished .
with respective shoulders 34 and 18, the latter are in
( contact against one another and serve as axial abutment
'l:i to the inner race 6 on the journal 2 in the direction
• of insertion.
In operation, the rotation causes an expansion of the
"retaining ring 40 which presses against the race
2) annular groove 26.
Dismantling the assembly arrangement comprises the
following operation: the retaining ring 4 0 is retracted
from the journal annular groove 3 6 by means of an
2) appropriate tool. For example, a tool, comprising pins
or lugs that penetrate into the openings 3 0 of the
inner race 6 and push out the retaining ring 40, :may be
used. Simultaneously, the inner race 6 is wit'hdrawn
from the journal 2 in the direction of the journal end
3) 50. _ _ — — ^ • • —-^ ,.

ORIGINAL
w We claim:
1. An assembly arrangement between an inner race (6) of a bearing and a journal (2)
supported in rotation in said bearing, said journal (2) having an axis (4), wherein said assembly
arrangement comprises:
a journal annular groove (36) made on an outer face (24) of said journal (2) and a race
annular groove (26) made on an inner face (66) of said inner race (6), said two annular grooves
interacting to form an annular channel (52) between said journal (2) and said inner face (66)
when the two annular grooves are placed opposite one another, a retaining ring (40) placed in
said annular channel (52), which prevents a relative movement, in translation along said axis (4),
between said journal (2) and said inner race (6), and at least one recess (38) of said journal (2)
and at least one tooth (32) of said inner race (6), which interact to prevent a relative movement,
in rotation about said axis (4), between said journal (2) and said inner race (6).
2. An assembly arrangement as claimed in claim 1, wherein each tooth (32) extends radially
inwards from the inner face (66) of the inner race (6).
3. An assembly arrangement as claimed in claim 1, wherein each recess (38) consists of a
blind hole of the journal (2).
4. An assembly arrangement as claimed in claim 1, wherein each recess (38) consists of a
longitudinal groove of the journal (2).
5. An assembly arrangement as claimed in claim 1, fiirther comprising at least one opening
(30) cormecting said race annular groove (26) to an outer face (24) of said inner race (6).
6. An assembly arrangement as claimed in claim 1, wherein said retaining ring (40)
includes a split oriented so as to facilitate insertion of said retaining ring (40) in said annular
channel (52).
7. An assembly arrangement as claimed in claim 1, wherein said journal (2) annular groove
(26) and said at least one recess (38) are placed either side of at least one oil duct which opens
W onto an outer face (24) of the journal (2) and carries oil to said inner race (6) through said
journal (2).
8. An assembly arrangement as claimed in claim 1, further comprising a bevel of the inner
race (6), in the vicinity of the race annular groove (26).
9. An assembly arrangement as claimed in claim 1, further comprising a race radial shoulder
and a journal radial shoulder, which interact to produce an axial abutment of said inner race (6)
on said journal (2).
10. An assembly arrangement as claimed in claim 1 wherein said inner race (6) comprises: a
race body (60) designed to interact with a bearing outer race, a first race end (62) comprising
first race assembly means for preventing a relative movement, in translation along the said axis
(4), between said journal (2) and said inner race (6), and a second race end (64) comprising
second race assembly means for preventing a relative movement, in rotation about said axis (4),
between said journal (2) and said inner race (6).
11. An assembly arrangement as claimed in claim 10, wherein said first race assembly means
comprise a race annular groove (26) made on an inner face (66) of said irmer race (6).
12. An assembly arrangement as claimed in claim 11, wherein the first race assembly means
comprise a bevel made at the extremity of said first race end (62), on an inner face (66) of said
inner race (6) and in the vicinity of said race annular groove (26).
13. An assembly arrangement as claimed in claim 10, wherein said first race assembly means
comprise at least one opening connecting said race annular groove (26) to an outer face (24) of
the said inner race (6).
14. An assembly arrangement as claimed in claim 10, wherein said second race assembly
means comprise at least one tooth (32) extending radially inwards at the extremity of the second
race end (64).
15. An assembly arrangement as claimed in claim 10, further comprising a race radial
shoulder between the race body (60) and the first race end (62).
16. A turbomachine comprising the bearing, the journal (2), and the assembly arrangement as
claimed in claim 10 wherein the assembly arrangement is between the inner race (6) of the bearing and the journal (2) is supported in rotation in said bearing.
17. An assembly arrangement as claimed in claim 1 wherein said journal (2) comprises: first
journal assembly means (36) for preventing a relative movement, in translation along the said
axis (4), between said journal (2) and said inner race (6), and second journal assembly means
(38) for preventing a relative movement, in rotation about said axis (4), between said journal (2)
and said inner race (6).
18. An assembly arrangement as claimed in claim 17, wherein said first journal assembly
means (36) comprise a journal annular groove (36) made on an outer face (24) of said journal
(2).
19. An assembly arrangement as claimed in claim 17, wherein said second journal assembly
means (38) comprising at least one recess (38) made in said journal (2).
20. An assembly arrangement as claimed in claim 19, wherein each recess (38) consist in a
blind hole of the journal (2).
21. An assembly arrangement as claimed in claim 19, wherein each recess (38) consists of a
longitudinal groove of the j oumal (2).
22. An assembly arrangement as claimed in claim 17, further comprising a journal radial
shoulder configured to interact with a race radial shoulder to produce an axial abutment of said
inner race (6) on said journal (2).
•
23. An assembly arrangement as claimed in claim 17, further comprising at least one oil duct
which opens onto an outer face (24) of said journal (2), said oil duct being placed between said
first journal assembly means (36) and said second journal assembly means (38).
24. A turbomachine comprising the bearing, the journal (2), and the assembly arrangetaent as
claimed in claim 17, wherein the assembly arrangement is between the inner race (6Jofthe
bearing and the journal (2) is supported in rotation in said bearing.
25. A turbomachine comprising the bearings the journal (2), and the assembly arrangement as
claimed in claim 1, wherein the assembly arrangement is between the inner race (6) of the
bearing and the journal (2) is supported in rotation in said bearing.
Dated this 13/04/2006 \A
^ V V v •
I JAYANTA PAL]
OFREfpRY&SAGAR
ATTORNEY F W THE APPLICANT[S]
i

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Patent Number

269512

Indian Patent Application Number

990/DEL/2006

PG Journal Number

44/2015

Publication Date

30-Oct-2015

Grant Date

26-Oct-2015

Date of Filing

13-Apr-2006

Name of Patentee

SNECMA

Applicant Address

2 boulevard du General Martial Valin, 75015 Paris, France

Inventors:

#	Inventor's Name	Inventor's Address
1	PHILIPPE PIERRE VINCENT BOUILLER	60, ru de Montmelian, 77210 Samoreau, France
2	GILLES ALAIN MARIE CHARIER	4, rue des Bas clos, 77130 La Grande Paroisse, France
3	DANIEL GEORGES PLONA	4,rue des Basses Grieches, 77870 Vulaines Sur Seine, France

PCT International Classification Number

F16C 19/00

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	05 50962	2005-04-15	France