Title of Invention	AN IMPROVED ROLLER CHAIN WITH PRESCRIBED PITCH FOR TRANSMITTING POWER OF A DRIVE SHAFT TO A DRIVEN SHAFT
Abstract	To provide a roller chain having a pitch of 12.7 mm and corresponding to ISO08B or ISO08MB which is lightweight, can be manufactured inexpensively, and is small in elongation due to wear, outer link plates and inner link plates have a thickness of 1.2 mm, and bending deformation of pins due to tensile stresses in inner and outer link plates is restricted whereby wear between pins and bushes is restricted. Bushes manufactured by cold forming are used.

Title of Invention

AN IMPROVED ROLLER CHAIN WITH PRESCRIBED PITCH FOR TRANSMITTING POWER OF A DRIVE SHAFT TO A DRIVEN SHAFT

Abstract

To provide a roller chain having a pitch of 12.7 mm and corresponding to ISO08B or ISO08MB which is lightweight, can be manufactured inexpensively, and is small in elongation due to wear, outer link plates and inner link plates have a thickness of 1.2 mm, and bending deformation of pins due to tensile stresses in inner and outer link plates is restricted whereby wear between pins and bushes is restricted. Bushes manufactured by cold forming are used.

Full Text	ROLLER CHAIN BACKGROUND OF THE INVENTION 5 1. Field of the Invention The present invention relates to a roller chain that is lightweight and hard to elongate, and can be constructed to afford inexpensive manufacturing and that has a pitch of 12.7 corresponding to ISO08B, ISO08MB, ANSI40, and JIS4D. 10 2. Related Art A roller chain of JIS40 comprises outer link plates 1. inner link plates 2. pins 3, bushes 4, and rollers 5 and has a predetermined pitch P. More specifically, both ends of a bush are press fitted into bush holes of the both inner link plates, the roller 5 is notatably supported on the bush 4, the pin is inserted into the bush hole, and both ends of the pin 15 projecting from the inner fink plates are press fitted into holes of the outer link plates. That is, an inner link that is constituted by the inner link plates 2, 2 and the bushes 4.4, and an outer link that is constituted by the outer link plates 1, 1 and the pins 3, 3: are connected to each other in a bendable manner. By the way, a roller chain is wound on a drive sprocket and a driven sprocket to 20 be able to transmit power of a drive shaft to a driven shaft. While other various means for power transmission from a drive shaft to a driven shaft are existent, a roller chain transmits a large power as compared with a bett transmission device, and affords freely setting a distance between a drive shaft and a driven shaft and readily accommodating for even the case where a distance between the both shafts is large, as compared with a 25 power transmission device that comprises a gear mechanism with a plurality of gears meshing with one another. A roller chain is prescribed by JIS (Japanese Industrial Standards) with respect to fundamental dimensions and tensile strength. A roller chain of JIS40 has a pitch P = 12.7, a distance W = 14.4 between outer link plates, a thickness T = 1.5 of inner and 30 outer link plates. A roller chain wound on sprockets of a drive shaft and a driven shaft can run while rollers 5 mesh with teeth of the sprockets, and at this time, tension acts on the outer iink plates 1 and the inner link plates 2 and the pins 3 and the bushes 4 perform bending deformation due to the tension. Accompanying the bending movements at the time of winding on the sprockets -1 - and at the time of separating from the sprockets, the pins 3 and the bushes 4 perform rotating movements relative to each other Tension acting on the roller chain generates a high surface pressure between the pin 3 and the bush holes, in which state rotating movements cause the pin 3 and the bush holes to wear. This leads to generation of 5 elongation of the chain. Among performances of a roller chain, the tensile strength is important but non-elongation is further important because the service life rarely expires due to insufficiency in strength but elongation is increased to frequently cause expiration of the service life. Elongation constitutes a phenomenon that certainty generates even in 10 driving in a non-load state, and so it is not easy to cope with such phenomenon. While the JIS standards include detailed regulations with respect to dimensions and strength of a roller chain but do not include any regulations with respect to elongation that has a significant influence in practical use. 15 SUMMARY OF THE INVENTION In this manner, conventional roller chains are manufactured on the basis of ISO Standards, JIS Standards, etc. It is an object of the invention to provide a roller chain that provides for tensile strength prescribed by ISO Standards, restricts elongation, is extended in service life, and corresponds to 1SO08B, ISO08MB, and J1S40. 20 A roller chain of the invention corresponding to ISO0SB or ISO08MB has a pitch of 127 mm that is according to the standard and the same as that of conventional roller chains. However, inner link plates and outer link plates have a thickness of 1.2 mm smaller than that (a thickness of 1.5 mm) of conventional inner link plates and outer link plates. Accordingly, a distance between both outer link plates amounts to 13.55 mm 25 and a distance between both inner link plates amounts to 10.4 mm. However, joint link plates, which are weak in strength, have the same thickness of 1.5 mm as that of conventional roller chains. Since outer link plates and inner link plates have a thickness of 1. 2 mm, a weight per pitch becomes small and so it is of course possible to reduce manufacturing cost due 30 to saving of materials. Since outer link plates and inner link plates are small in thickness, bending moment acting on pins is decreased. That is, pins are bent due to a distance between inner link plates and outer link plates. When such distance is small, bending moment acting under the same tension can be restricted to a small magnitude and pins and bushes are decreased in bending deformation. -2- This brings about a decrease in local surface pressure on bush holes, so that it is possible to restrict wear. Meanwhile, in the case where respective links are small in mass, centrifugal forces are decreased when the links are wound on a sprocket to be rotated This brings about a decrease in surface pressure between pins and bushes, 5 and hence leads to restriction on wear. BRIEF DESCRIPTION OF THE DRAWING Fig, 1 is a view showing a roller chain according to the invention; Fig. 2 is a view showing the relationship between a pin and a bush in the roller 10 chain; and Fig. 3 is a view showing a roller chain of J1S40. DETAILED DESCRIPTION OF PREFERRED EMBODIMENT Fig. 1 shows an embodiment of a roller chain according to the invention, the 15 roller chain corresponding to ISO08B or ISO08MB. The roller chain is different partially in dimension from a roller chain of JIS40 shown in Fig. 3 while being the same in fundamental construction as the latter. Pitch P is the same as that of the roller chain of JJS40 to amount to 12 7 mm but a thickness of outer link plates 1 and inner link plates 2 are smaller than that of the latter to amount to T = 1.2 mm. 20 Since the outer link plates 1 and inner link plates 2 are small in thickness, respective parts of the roller chain are somewhat different in dimension from those of the roller chain of JIS40 A distance between the both outer link plates 1,1 amounts to W = 13.55 mm, and a distance between the both inner link plates 2, 2 amounts to V = 10.4 mm. Since power is transmitted by winding the roller chain on a sprocket having the 25 same face width as that of conventional ones, however, the rollers 5 have an outside diameter of 8.5 mm and a distance between inner surfaces of the inner link plates 2, 2 amounts to 8.0 mm or more. Bushes are not rotted ones but bushes manufactured by cold forming are used, and joint links, which are weak in strength, have the same thickness of 1.5 mm as that of 30 conventional roller chains. By the way, a thickness of the outer link plates 1 and the Inner link plates 2 amounts to 1,2 mm in this manner whereby the roller chain is reduced approximately 12 % in weight and decreased a little in tensile strength and fatigue strength. However, saving in materials leads to a decrease of about 10 % in manufacturing cost and an increase of about 10 % in wear performance (restriction of -3- elongation). Fig. 2 shows the relationship between the bush 4 and the pin 3 in the roller chain. When tension P acts on the outer link plates 1 and the inner link plates 2, the pin 3 is bent as shown in the figure. A moment M = 2PxA acts to cause bending deformation of the 5 pin 3 where A indicates a distance between the outer link plates 1 and the inner link plates 2 in this manner, the pin 3 is bent by the tension P. which acts on the roller chain. and contacts with an inner peripheral surface of the bush hole to accelerate wear. With the roller chain according to the invention, the outer link plates 1 and the inner Iink plates 2 have a thickness of 1.2 mm whereby the distance A is decreased and 10 a bending moment M generated with tension being the same is decreased, which leads to restriction; on wear between pins and bushes. - 4 - WHAT IS CLAIMED IS: WE CLAIM 1. A roller chain having a pitch of 12.7 mm, wherein outer link plates and inner link plates have a thickness of 1.2 mm. and bushes are manufactured by cold forming, 5 2. A roller chain having a pitch of 12.7 mm, wherein outer link plates and inner link plates have a thickness of 12 mm, bushes are manufactured by cold forming, a distance W between outer surfaces of the both outer link plates is approximately 13.55 mm, a distance V between outer surfaces of the both inner link plates is not less than 10 10.95 mm, and rollers have an outside diameter of not g neater than 8.5mm. -5- To provide a roller chain having a pitch of 12.7 mm and corresponding to ISO08B or ISO08MB which is lightweight, can be manufactured inexpensively, and is small in elongation due to wear, outer link plates and inner link plates have a thickness of 1.2 mm, and bending deformation of pins due to tensile stresses in inner and outer link plates is restricted whereby wear between pins and bushes is restricted. Bushes manufactured by cold forming are used.

Full Text

ROLLER CHAIN
BACKGROUND OF THE INVENTION
5 1. Field of the Invention
The present invention relates to a roller chain that is lightweight and hard to
elongate, and can be constructed to afford inexpensive manufacturing and that has a
pitch of 12.7 corresponding to ISO08B, ISO08MB, ANSI40, and JIS4D.
10 2. Related Art
A roller chain of JIS40 comprises outer link plates 1. inner link plates 2. pins 3,
bushes 4, and rollers 5 and has a predetermined pitch P. More specifically, both ends of
a bush are press fitted into bush holes of the both inner link plates, the roller 5 is notatably
supported on the bush 4, the pin is inserted into the bush hole, and both ends of the pin
15 projecting from the inner fink plates are press fitted into holes of the outer link plates.
That is, an inner link that is constituted by the inner link plates 2, 2 and the bushes 4.4,
and an outer link that is constituted by the outer link plates 1, 1 and the pins 3, 3: are
connected to each other in a bendable manner.
By the way, a roller chain is wound on a drive sprocket and a driven sprocket to
20 be able to transmit power of a drive shaft to a driven shaft. While other various means
for power transmission from a drive shaft to a driven shaft are existent, a roller chain
transmits a large power as compared with a bett transmission device, and affords freely
setting a distance between a drive shaft and a driven shaft and readily accommodating
for even the case where a distance between the both shafts is large, as compared with a
25 power transmission device that comprises a gear mechanism with a plurality of gears
meshing with one another.
A roller chain is prescribed by JIS (Japanese Industrial Standards) with respect to
fundamental dimensions and tensile strength. A roller chain of JIS40 has a pitch P =
12.7, a distance W = 14.4 between outer link plates, a thickness T = 1.5 of inner and
30 outer link plates. A roller chain wound on sprockets of a drive shaft and a driven shaft
can run while rollers 5 mesh with teeth of the sprockets, and at this time, tension acts on
the outer iink plates 1 and the inner link plates 2 and the pins 3 and the bushes 4 perform
bending deformation due to the tension.
Accompanying the bending movements at the time of winding on the sprockets

-1 -

and at the time of separating from the sprockets, the pins 3 and the bushes 4 perform
rotating movements relative to each other Tension acting on the roller chain generates
a high surface pressure between the pin 3 and the bush holes, in which state rotating
movements cause the pin 3 and the bush holes to wear. This leads to generation of
5 elongation of the chain.
Among performances of a roller chain, the tensile strength is important but
non-elongation is further important because the service life rarely expires due to
insufficiency in strength but elongation is increased to frequently cause expiration of the
service life. Elongation constitutes a phenomenon that certainty generates even in
10 driving in a non-load state, and so it is not easy to cope with such phenomenon. While
the JIS standards include detailed regulations with respect to dimensions and strength of
a roller chain but do not include any regulations with respect to elongation that has a
significant influence in practical use.
15 SUMMARY OF THE INVENTION
In this manner, conventional roller chains are manufactured on the basis of ISO
Standards, JIS Standards, etc. It is an object of the invention to provide a roller chain
that provides for tensile strength prescribed by ISO Standards, restricts elongation, is
extended in service life, and corresponds to 1SO08B, ISO08MB, and J1S40.
20 A roller chain of the invention corresponding to ISO0SB or ISO08MB has a pitch
of 127 mm that is according to the standard and the same as that of conventional roller
chains. However, inner link plates and outer link plates have a thickness of 1.2 mm
smaller than that (a thickness of 1.5 mm) of conventional inner link plates and outer link
plates. Accordingly, a distance between both outer link plates amounts to 13.55 mm
25 and a distance between both inner link plates amounts to 10.4 mm. However, joint link
plates, which are weak in strength, have the same thickness of 1.5 mm as that of
conventional roller chains.
Since outer link plates and inner link plates have a thickness of 1. 2 mm, a weight
per pitch becomes small and so it is of course possible to reduce manufacturing cost due
30 to saving of materials. Since outer link plates and inner link plates are small in thickness,
bending moment acting on pins is decreased. That is, pins are bent due to a distance
between inner link plates and outer link plates. When such distance is small, bending
moment acting under the same tension can be restricted to a small magnitude and pins
and bushes are decreased in bending deformation.
-2-

This brings about a decrease in local surface pressure on bush holes, so that it is
possible to restrict wear. Meanwhile, in the case where respective links are small in
mass, centrifugal forces are decreased when the links are wound on a sprocket to be
rotated This brings about a decrease in surface pressure between pins and bushes,
5 and hence leads to restriction on wear.
BRIEF DESCRIPTION OF THE DRAWING
Fig, 1 is a view showing a roller chain according to the invention;
Fig. 2 is a view showing the relationship between a pin and a bush in the roller
10 chain; and
Fig. 3 is a view showing a roller chain of J1S40.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENT
Fig. 1 shows an embodiment of a roller chain according to the invention, the
15 roller chain corresponding to ISO08B or ISO08MB. The roller chain is different partially
in dimension from a roller chain of JIS40 shown in Fig. 3 while being the same in
fundamental construction as the latter. Pitch P is the same as that of the roller chain of
JJS40 to amount to 12 7 mm but a thickness of outer link plates 1 and inner link plates 2
are smaller than that of the latter to amount to T = 1.2 mm.
20 Since the outer link plates 1 and inner link plates 2 are small in thickness,
respective parts of the roller chain are somewhat different in dimension from those of the
roller chain of JIS40 A distance between the both outer link plates 1,1 amounts to W =
13.55 mm, and a distance between the both inner link plates 2, 2 amounts to V = 10.4
mm. Since power is transmitted by winding the roller chain on a sprocket having the
25 same face width as that of conventional ones, however, the rollers 5 have an outside
diameter of 8.5 mm and a distance between inner surfaces of the inner link plates 2, 2
amounts to 8.0 mm or more.
Bushes are not rotted ones but bushes manufactured by cold forming are used,
and joint links, which are weak in strength, have the same thickness of 1.5 mm as that of
30 conventional roller chains. By the way, a thickness of the outer link plates 1 and the
Inner link plates 2 amounts to 1,2 mm in this manner whereby the roller chain is reduced
approximately 12 % in weight and decreased a little in tensile strength and fatigue
strength. However, saving in materials leads to a decrease of about 10 % in
manufacturing cost and an increase of about 10 % in wear performance (restriction of

-3-

elongation).
Fig. 2 shows the relationship between the bush 4 and the pin 3 in the roller chain.
When tension P acts on the outer link plates 1 and the inner link plates 2, the pin 3 is bent
as shown in the figure. A moment M = 2PxA acts to cause bending deformation of the
5 pin 3 where A indicates a distance between the outer link plates 1 and the inner link
plates 2 in this manner, the pin 3 is bent by the tension P. which acts on the roller chain.
and contacts with an inner peripheral surface of the bush hole to accelerate wear.
With the roller chain according to the invention, the outer link plates 1 and the
inner Iink plates 2 have a thickness of 1.2 mm whereby the distance A is decreased and
10 a bending moment M generated with tension being the same is decreased, which leads
to restriction; on wear between pins and bushes.
- 4 -

WHAT IS CLAIMED IS:
WE CLAIM
1. A roller chain having a pitch of 12.7 mm, wherein outer link plates and inner
link plates have a thickness of 1.2 mm. and bushes are manufactured by cold forming,
5
2. A roller chain having a pitch of 12.7 mm, wherein outer link plates and inner
link plates have a thickness of 12 mm, bushes are manufactured by cold forming, a
distance W between outer surfaces of the both outer link plates is approximately 13.55
mm, a distance V between outer surfaces of the both inner link plates is not less than
10 10.95 mm, and rollers have an outside diameter of not g neater than 8.5mm.

-5-

To provide a roller chain having a pitch of 12.7 mm and corresponding to
ISO08B or ISO08MB which is lightweight, can be manufactured inexpensively, and is
small in elongation due to wear, outer link plates and inner link plates have a thickness of
1.2 mm, and bending deformation of pins due to tensile stresses in inner and outer link
plates is restricted whereby wear between pins and bushes is restricted. Bushes
manufactured by cold forming are used.

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Patent Number

279337

Indian Patent Application Number

492/KOL/2005

PG Journal Number

03/2017

Publication Date

20-Jan-2017

Grant Date

18-Jan-2017

Date of Filing

10-Jun-2005

Name of Patentee

DAIDO KOGYO CO. LTD,

Applicant Address

I-197, KUMASAKA-CHO, KAGA-SHI, ISHIKAWA, 922-8686, JAPAN

Inventors:

#	Inventor's Name	Inventor's Address
1	KEN SAKURADANI,	I-197, KUMASAKA-CHO, KAGA-SHI, ISHIKAWA, 922-8686, JAPAN

PCT International Classification Number

F16C33/34

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA