Title of Invention	A TEST RIG FOR VALIDATION OF ENGINE VALVE GUIDE SEALS AND METHOD OF TESTING THEREOF
Abstract	This invention relates to test rig and method of testing for validation of engine valve guide seals. Said rig comprises of cylinder head assembly, cylinder head cover, inlet & exhaust manifolds, cylinder block with closed bottom end having provision for oil collection, crank shaft, valve train, provision for fitment of weighing paper, oil collection unit, oil sump, oil pump, oil measuring tubes, prime mover, electric heater, mounting bracket. Said cylinder head assembly further comprises of valves, valve guides, valve guide seals, valve spring, and inlet and exhaust ports. Said valve train further comprises of cam shaft, tappet, push rod and rocker arm. Wherein said cylinder block is mounted on mounting bracket and the bottom of said cylinder block is closed with the provision for oil collection. Said cylinder head assembly is mounted on cylinder block. Crankshaft, cam shaft, valve train, drive train & oil pump are fitted inside said cylinder block. Said cylinder head cover with inlet manifold having provision for boost pressure connection and exhaust manifold having provision for back pressure connection are mounted on cylinder head. Oil sump provided with electrical heater is mounted on modified cylinder block. Graduated oil measuring tubes are mounted on external mounting bracket.

Title of Invention

A TEST RIG FOR VALIDATION OF ENGINE VALVE GUIDE SEALS AND METHOD OF TESTING THEREOF

Abstract

This invention relates to test rig and method of testing for validation of engine valve guide seals. Said rig comprises of cylinder head assembly, cylinder head cover, inlet & exhaust manifolds, cylinder block with closed bottom end having provision for oil collection, crank shaft, valve train, provision for fitment of weighing paper, oil collection unit, oil sump, oil pump, oil measuring tubes, prime mover, electric heater, mounting bracket. Said cylinder head assembly further comprises of valves, valve guides, valve guide seals, valve spring, and inlet and exhaust ports. Said valve train further comprises of cam shaft, tappet, push rod and rocker arm. Wherein said cylinder block is mounted on mounting bracket and the bottom of said cylinder block is closed with the provision for oil collection. Said cylinder head assembly is mounted on cylinder block. Crankshaft, cam shaft, valve train, drive train & oil pump are fitted inside said cylinder block. Said cylinder head cover with inlet manifold having provision for boost pressure connection and exhaust manifold having provision for back pressure connection are mounted on cylinder head. Oil sump provided with electrical heater is mounted on modified cylinder block. Graduated oil measuring tubes are mounted on external mounting bracket.

Full Text	FORM 2 THE PATENTS ACT 1970 (39 of 1970) & THE PATENTS RULES, 2003 COMPLETE SPECIFICATION (See Section 10; rule 13) TITLE OF THE INVENTION A Novel Test Rig For Validation Of Engine Valve Guide Seals And Method Of Testing Thereof APPLICANTS TATA MOTORS LIMITED, an Indian company having its registered office at Bombay House, 24 Homi Mody Street, Hutatma Chowk, Mumbai 400 001 Maharashtra, India INVENTORS Amol R. Dangare and Vivek R. Jalgaonkar, both Indian nationals of TATA MOTORS LIMITED, an Indian company having its registered office at Bombay House, 24 Homi Mody Street, Hutatma Chowk, Mumbai 400 001 Maharashtra, India PREAMBLE TO THE DESCRIPTION The following specification particularly describes the invention and the manner in which it is to be performed FIELD OF INVENTION This invention relates to test rigs used for validation of internal combustion engines and more particularly it relates to test rig for validation of engine valve guide seals. BACKGROUND OF THE INVENTION: Internal combustion engines have valve guide seals for metering lubricating oil for lubrication of valve stem & guide while arresting excess oil from entering into combustion chamber & getting burnt off. Conventional method of validating valve guide seals comprises of fitment on actual engine and monitoring any change in oil consumption and port/ valve wetting. During actual engine operation, oil metered through valve guide seal for lubrication of valve stem is either sucked inside the combustion chamber & burns or is swept away by exhaust gases. This phenomenon makes it difficult to quantify the rate of oil leakage passed the seal and evaluate the effect of endurance test on seal performance. Hence, validation is also carried out on test rig. Standard test rigs consist of modular cylinder head with arrangement to accommodate valve guides, valve guide seals, valves, valve springs & valve retainers etc. This modular cylinder head is mounted on a chamber which has provision for oil measuring. Valves are actuated using mechanical drives with required frequency & stroke. Oil pressure, temperature, flow rate, boost/ back pressure etc. are maintained as per requirements. After specific test interval, oil collected in the chamber is used for analysis/ approval of seals. The existing test rig is having limitation like fixed geometry of valve guides, fixed geometry of inlet & exhaust ports, no provision for measuring oil leakage, no provision to apply boost /back pressure, no provision for heating oil, no provision 2 for variable speeds etc. Existing rig can not evaluate the effect of endurance test on oil leakage/ metering rate due to modular head, which can not be fitted & tested on actual engine. In order to overcome these shortcomings, this novel test rig is devised. OBJECTS OF INVENTION The main object of this invention is to provide a novel test rig and method of testing for validation of engine valve guide seals which can quantify the oil leakage through seals. Yet another object of this invention is to provide a novel test rig and method of testing for validation of engine valve guide seals on actual cylinder head taking care of all geometrical tolerance variations. Yet another object of this invention is to provide a novel test rig and method of testing for validation of engine valve guide seals under the effect of various engine operating parameters. Yet another object of this invention is to provide a novel test rig and method of testing for validation of various seal designs from different suppliers for same engine simultaneously. Yet another object of this invention is to provide a novel test rig and method of testing for validation of seal performance deterioration. Yet another object of this invention is to provide a novel test rig and method of testing for validation of seals which is simple and cost effective. 3 STATEMENT OF INVENTION Novel test rig for validation of engine valve guide seals comprising of cylinder head assembly, cylinder head cover, inlet & exhaust manifolds, cylinder block, crank shaft, valve train, oil sump, oil pump, oil collection unit, prime mover and mounting means wherein said cylinder block is mounted on mounting means and bottom of said cylinder block is closed with a provision of separate oil collection from one or more cylinder bores, said cylinder head assembly is mounted on cylinder block; crankshaft, cam shaft, valve train, drive train & oil pump are provided inside said cylinder block, said cylinder head cover with inlet manifold and exhaust manifold are mounted on said cylinder head. Novel test rig for validation of engine valve guide seals wherein said cylinder head assembly comprises of valves, valve guides, valve guide seals, valve spring, and inlet and exhaust ports. Novel test rig for validation of engine valve guide seals wherein said valve train comprises of cam shaft, tappet, push rod and rocker arm or over head cam shaft with drive unit. BRIEF DESCRIPTION OF INVENTION Test rig in accordance with this invention basically comprises of cylinder head assembly, cylinder head cover, inlet & exhaust manifolds, cylinder block with closed bottom end having provision for oil collection, crank shaft, valve train, provision for fitment of weighing paper, oil collection unit, oil sump, oil pump, oil measuring tubes, prime mover, electric heater, mounting bracket. 4 Said cylinder head assembly further comprises of valves, valve guides, valve guide seals, valve spring, and inlet and exhaust ports. Said valve train further comprises of cam shaft, tappet, push rod and rocker arm. Wherein said cylinder block is mounted on mounting bracket and the bottom of said cylinder block is closed with the provision for oil collection. Said cylinder head assembly is mounted on cylinder block. Crankshaft, cam shaft, valve train, drive train & oil pump are fitted inside said cylinder block. Said cylinder head cover with inlet manifold having provision for boost pressure connection and exhaust manifold having provision for back pressure connection are mounted on cylinder head. Oil sump provided with electrical heater is mounted on modified cylinder block. Graduated oil measuring tubes are mounted on external mounting bracket. When prime mover is started crankshaft gets power through belt drive, which in turn drives the valve train units and oil pump. Engine oil is circulated with required temperature, pressure & flow rate. Boost & back pressure are applied through inlet & exhaust ports. Test rig is driven by a prime mover at required rpm for specified duration. Oil leaked through the seals is collected in combustion chamber. This oil is measured for analyzing the seals. Method of testing valve guide seals comprises: a. Fitment of different seals on cylinder head with all corresponding parts; b. Fitment of cylinder head on test rig and running test rig as per specified cycle & duration; c. Collecting oil leaked through all seals in respective oil collection units; d. Analysing initial performance of seals based on oil leakage rate; e. Comparing different seals based on leakage rate; f. Removing cylinder head from test rig & fitment on actual engine; g. Endurance of seals on engine as per particular cycle & duration; 5 h. Checking of oil consumption and port wetting; i. Removing cylinder head from engine & fitment on test rig; j. Running test rig again as per particular cycle & duration; k. Analysing final performance (deterioration) of seals based on oil leakage rate. Above said testing can also be separately carried out only for inlet seals by non actuating exhaust seals by removing respective rocker arms and vice versa. DESCRIPTION OF DRAWING Fig 1. Shows cross section of test rig in accordance with this invention DETAILED DESCRIPTION OF INVENTION Referring now to the drawing wherein the showings are for the purpose of illustrating a preferred embodiment of the invention only, and not for the purpose of limiting the same. Referring to figure 1, test rig basically comprises of cylinder head assembly (1), cylinder head cover (8), inlet & exhaust manifolds (10), cylinder block (6)with closed bottom end having provision for oil collection, crank shaft (15), valve train, provision for fitment of weighing paper (11), oil collection unit (12) from closed cylinder block bottom to outside engine, oil sump (19) , oil pump (16), oil measuring tubes (13), prime mover (17), electric heater (18), mounting bracket (14). Said cylinder head assembly (1) further comprises of valves (3), valve guides (2), valve guide seals (A), valve spring (9), inlet and exhaust ports (4).Said valve train 6 further comprises of cam shaft (20), tappet (21), push rod (5) and rocker arm (7) or over head cam shaft with drive unit. Actual operating engine is converted into test rig by removing pistons and connecting rod. Arrangement is made for collecting oil passed through valve guide oil seals by closing combustion chamber bottom end. Crank shaft (15) is driven by prime mover (17) through variable speed drive. This facilitates running rig on any cycle including over speeding as may be desired. Crank shaft in turn drives cam shaft (20) and valve train units such as tappets (21), push rod (5), rocker arm (7) & valves (3). Intake & exhaust manifolds (10) are blocked with provision of compressed air supply (CI, C2) to simulate boost/ back pressure (PI, P2). Cylinder block (6) bottom end is closed by using blocking plates with a provision of oil collection. Oil collection units (12) are fitted with tap & graduated oil measuring tubes (13). Alternatively, pre-weighed oil absorbing papers (11) can be used in combustion chamber to measure minute oil leakages. Oil sump is fitted with electric heater (18) for maintaining oil temperature (Tl) as per requirement. When the rig is driven, oil pump circulates the oil throughout the oil circuit. The same is also supplied to rocker arm & valves for lubrication. Use of actual cylinder head has facilitated maintaining exact pressure & level of oil above valve guide as experienced during actual engine operation. Oil seals meter amount of oil, which is necessary for lubrication of valve stem & valve guide. If valve guide seals (A) are leaking, excess oil is collected in combustion chamber or on pre-weighed papers. The amount of oil or change in paper weight is used for analysis of oil seal initial performance or for comparison of various seal designs on same set up simultaneously. As actual cylinder head assembly is used as a part of test rig, the same can be removed & fitted on engine for further endurance test. After endurance test on engine, seal performance is again confirmed on test rig. This helps in estimating seal life. 7 Method of testing valve guide seals comprises: a. Fitment of different seals on cylinder head with all corresponding parts; b. Fitment of cylinder head on test rig and running test rig as per specified cycle & duration; c. Collecting oil leaked through all seals in respective oil collection units; d. Analysing initial performance of seals based on oil leakage rate; e. Comparing different seals based on leakage rate; f. Removing cylinder head from test rig & fitment on actual engine; g. Endurance of seals on engine as per particular cycle & duration; h. Checking of oil consumption and port wetting; i. Removing cylinder head from engine & fitment on test rig; j. Running test rig again as per particular cycle & duration; k. Analysing final performance (deterioration) of seals based on oil leakage rate. Above said testing can also be separately carried out only for inlet seals by non actuating exhaust seals by removing respective rocker arms and vice versa. The foregoing description is a specific embodiment of the present invention. It should be appreciated that this embodiment is described for purpose of illustration only, and that numerous alterations and modifications may be practiced by those skilled in the art without departing from the spirit and scope of the invention. It is intended that all such modifications and alterations be included in so far as they come within the scope of the invention as claimed or the equivalents thereof. 8 WE CLAIM 1. Novel test rig for validation of engine valve guide seals comprising of cylinder head assembly, cylinder head cover, inlet & exhaust manifolds, cylinder block, crank shaft, valve train, oil sump, oil pump, oil collection unit, prime mover and mounting means wherein said cylinder block is mounted on mounting means and bottom of said cylinder block is closed with a provision of separate oil collection from one or more cylinder bores, said cylinder head assembly is mounted on cylinder block; crankshaft, cam shaft, valve train, drive train & oil pump are provided inside said cylinder block, said cylinder head cover with inlet manifold and exhaust manifold are mounted on said cylinder head. 2. Novel test rig for validation of engine valve guide seals as claimed in claim 1 wherein said cylinder head assembly comprises of valves, valve guides, valve guide seals, valve spring, and inlet and exhaust ports. 3. Novel test rig for validation of engine valve guide seals as claimed in claim 1 wherein said valve train comprises of cam shaft, tappet, push rod and rocker arm or over head cam shaft with drive unit. 4. Novel test rig for validation of engine valve guide seals as claimed in claims 1 to 3 wherein said cylinder block is having provision for fitment of weighing paper. 5. Novel test rig for validation of engine valve guide seals as claimed in claims 1 to 4 wherein said inlet manifold is provided with boost pressure connection and exhaust manifold is provided with back pressure connection. 9 6. Novel test rig for validation of engine valve guide seals as claimed in claims 1 to 5 wherein said oil sump is provided with electrical heater. 7. Novel test rig for validation of engine valve guide seals as claimed in claims 1 to 6 wherein said rig is further provided with graduated oil measuring units. 8. Method of testing valve guide seals by using test rig for validation of engine valve guide seals as claimed in claims 1 to 7 comprises of a. Fitment of different seals on cylinder head with all corresponding parts; b. Fitment of cylinder head on test rig and running test rig as per specified cycle & duration; c. Collecting oil leaked through all seals in respective oil collection units; d. Analysing initial performance of seals based on oil leakage rate; e. Comparing different seals based on leakage rate; f. Removing cylinder head from test rig & fitment on actual engine; g. Endurance of seals on engine as per particular cycle & duration; h. Checking of oil consumption and port wetting; i. Removing cylinder head from engine & fitment on test rig; j. Running test rig again as per particular cycle & duration; k. Analysing final performance (deterioration) of seals based on oil leakage rate. 9. Method of testing valve guide seals as claimed in claim 8 wherein said testing is separately carried out only for inlet seals by non actuating exhaust seals by removing respective rocker arms or only for exhaust seals by non actuating inlet seals by removing respective rocker arms. 10 10. Novel test rig for validation of engine valve guide seals and method of testing valve guide seals substantially as herein described with reference to accompanying drawing. 11 ABSTRACT A Novel Test Rig For Validation Of Engine Valve Guide Seals And Method Of Testing Thereof This invention relates to test rig and method of testing for validation of engine valve guide seals. Said rig comprises of cylinder head assembly, cylinder head cover, inlet & exhaust manifolds, cylinder block with closed bottom end having provision for oil collection, crank shaft, valve train, provision for fitment of weighing paper, oil collection unit, oil sump, oil pump, oil measuring tubes, prime mover, electric heater, mounting bracket. Said cylinder head assembly further comprises of valves, valve guides, valve guide seals, valve spring, and inlet and exhaust ports. Said valve train further comprises of cam shaft, tappet, push rod and rocker arm. Wherein said cylinder block is mounted on mounting bracket and the bottom of said cylinder block is closed with the provision for oil collection. Said cylinder head assembly is mounted on cylinder block. Crankshaft, cam shaft, valve train, drive train & oil pump are fitted inside said cylinder block. Said cylinder head cover with inlet manifold having provision for boost pressure connection and exhaust manifold having provision for back pressure connection are mounted on cylinder head. Oil sump provided with electrical heater is mounted on modified cylinder block. Graduated oil measuring tubes are mounted on external mounting bracket. Figl

Full Text

FORM 2
THE PATENTS ACT 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
(See Section 10; rule 13)
TITLE OF THE INVENTION
A Novel Test Rig For Validation Of Engine Valve Guide Seals And Method Of Testing Thereof
APPLICANTS
TATA MOTORS LIMITED, an Indian company
having its registered office at Bombay House,
24 Homi Mody Street, Hutatma Chowk,
Mumbai 400 001 Maharashtra, India
INVENTORS
Amol R. Dangare and Vivek R. Jalgaonkar, both Indian nationals
of TATA MOTORS LIMITED,
an Indian company having its registered office
at Bombay House, 24 Homi Mody Street, Hutatma Chowk,
Mumbai 400 001 Maharashtra, India
PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the invention and the manner in which it is to be performed

FIELD OF INVENTION
This invention relates to test rigs used for validation of internal combustion engines and more particularly it relates to test rig for validation of engine valve guide seals.
BACKGROUND OF THE INVENTION:
Internal combustion engines have valve guide seals for metering lubricating oil for lubrication of valve stem & guide while arresting excess oil from entering into combustion chamber & getting burnt off.
Conventional method of validating valve guide seals comprises of fitment on actual engine and monitoring any change in oil consumption and port/ valve wetting. During actual engine operation, oil metered through valve guide seal for lubrication of valve stem is either sucked inside the combustion chamber & burns or is swept away by exhaust gases. This phenomenon makes it difficult to quantify the rate of oil leakage passed the seal and evaluate the effect of endurance test on seal performance. Hence, validation is also carried out on test rig. Standard test rigs consist of modular cylinder head with arrangement to accommodate valve guides, valve guide seals, valves, valve springs & valve retainers etc. This modular cylinder head is mounted on a chamber which has provision for oil measuring. Valves are actuated using mechanical drives with required frequency & stroke. Oil pressure, temperature, flow rate, boost/ back pressure etc. are maintained as per requirements. After specific test interval, oil collected in the chamber is used for analysis/ approval of seals.
The existing test rig is having limitation like fixed geometry of valve guides, fixed geometry of inlet & exhaust ports, no provision for measuring oil leakage, no provision to apply boost /back pressure, no provision for heating oil, no provision
2

for variable speeds etc. Existing rig can not evaluate the effect of endurance test on oil leakage/ metering rate due to modular head, which can not be fitted & tested on actual engine. In order to overcome these shortcomings, this novel test rig is devised.
OBJECTS OF INVENTION
The main object of this invention is to provide a novel test rig and method of testing for validation of engine valve guide seals which can quantify the oil leakage through seals.
Yet another object of this invention is to provide a novel test rig and method of testing for validation of engine valve guide seals on actual cylinder head taking care of all geometrical tolerance variations.
Yet another object of this invention is to provide a novel test rig and method of testing for validation of engine valve guide seals under the effect of various engine operating parameters.
Yet another object of this invention is to provide a novel test rig and method of testing for validation of various seal designs from different suppliers for same engine simultaneously.
Yet another object of this invention is to provide a novel test rig and method of testing for validation of seal performance deterioration.
Yet another object of this invention is to provide a novel test rig and method of testing for validation of seals which is simple and cost effective.
3

STATEMENT OF INVENTION
Novel test rig for validation of engine valve guide seals comprising of cylinder head assembly, cylinder head cover, inlet & exhaust manifolds, cylinder block, crank shaft, valve train, oil sump, oil pump, oil collection unit, prime mover and mounting means wherein said cylinder block is mounted on mounting means and bottom of said cylinder block is closed with a provision of separate oil collection from one or more cylinder bores, said cylinder head assembly is mounted on cylinder block; crankshaft, cam shaft, valve train, drive train & oil pump are provided inside said cylinder block, said cylinder head cover with inlet manifold and exhaust manifold are mounted on said cylinder head.
Novel test rig for validation of engine valve guide seals wherein said cylinder head assembly comprises of valves, valve guides, valve guide seals, valve spring, and inlet and exhaust ports.
Novel test rig for validation of engine valve guide seals wherein said valve train comprises of cam shaft, tappet, push rod and rocker arm or over head cam shaft with drive unit.
BRIEF DESCRIPTION OF INVENTION
Test rig in accordance with this invention basically comprises of cylinder head assembly, cylinder head cover, inlet & exhaust manifolds, cylinder block with closed bottom end having provision for oil collection, crank shaft, valve train, provision for fitment of weighing paper, oil collection unit, oil sump, oil pump, oil measuring tubes, prime mover, electric heater, mounting bracket.
4

Said cylinder head assembly further comprises of valves, valve guides, valve guide seals, valve spring, and inlet and exhaust ports. Said valve train further comprises of cam shaft, tappet, push rod and rocker arm.
Wherein said cylinder block is mounted on mounting bracket and the bottom of said cylinder block is closed with the provision for oil collection. Said cylinder head assembly is mounted on cylinder block. Crankshaft, cam shaft, valve train, drive train & oil pump are fitted inside said cylinder block. Said cylinder head cover with inlet manifold having provision for boost pressure connection and exhaust manifold having provision for back pressure connection are mounted on cylinder head. Oil sump provided with electrical heater is mounted on modified cylinder block. Graduated oil measuring tubes are mounted on external mounting bracket.
When prime mover is started crankshaft gets power through belt drive, which in turn drives the valve train units and oil pump. Engine oil is circulated with required temperature, pressure & flow rate. Boost & back pressure are applied through inlet & exhaust ports. Test rig is driven by a prime mover at required rpm for specified duration. Oil leaked through the seals is collected in combustion chamber. This oil is measured for analyzing the seals.
Method of testing valve guide seals comprises:
a. Fitment of different seals on cylinder head with all corresponding parts;
b. Fitment of cylinder head on test rig and running test rig as per specified
cycle & duration;
c. Collecting oil leaked through all seals in respective oil collection units;
d. Analysing initial performance of seals based on oil leakage rate;
e. Comparing different seals based on leakage rate;
f. Removing cylinder head from test rig & fitment on actual engine;
g. Endurance of seals on engine as per particular cycle & duration;
5

h. Checking of oil consumption and port wetting; i. Removing cylinder head from engine & fitment on test rig; j. Running test rig again as per particular cycle & duration; k. Analysing final performance (deterioration) of seals based on oil leakage rate.
Above said testing can also be separately carried out only for inlet seals by non actuating exhaust seals by removing respective rocker arms and vice versa.
DESCRIPTION OF DRAWING
Fig 1. Shows cross section of test rig in accordance with this invention
DETAILED DESCRIPTION OF INVENTION
Referring now to the drawing wherein the showings are for the purpose of illustrating a preferred embodiment of the invention only, and not for the purpose of limiting the same.
Referring to figure 1, test rig basically comprises of cylinder head assembly (1), cylinder head cover (8), inlet & exhaust manifolds (10), cylinder block (6)with closed bottom end having provision for oil collection, crank shaft (15), valve train, provision for fitment of weighing paper (11), oil collection unit (12) from closed cylinder block bottom to outside engine, oil sump (19) , oil pump (16), oil measuring tubes (13), prime mover (17), electric heater (18), mounting bracket (14).
Said cylinder head assembly (1) further comprises of valves (3), valve guides (2), valve guide seals (A), valve spring (9), inlet and exhaust ports (4).Said valve train
6

further comprises of cam shaft (20), tappet (21), push rod (5) and rocker arm (7) or over head cam shaft with drive unit.
Actual operating engine is converted into test rig by removing pistons and connecting rod. Arrangement is made for collecting oil passed through valve guide oil seals by closing combustion chamber bottom end. Crank shaft (15) is driven by prime mover (17) through variable speed drive. This facilitates running rig on any cycle including over speeding as may be desired. Crank shaft in turn drives cam shaft (20) and valve train units such as tappets (21), push rod (5), rocker arm (7) & valves (3). Intake & exhaust manifolds (10) are blocked with provision of compressed air supply (CI, C2) to simulate boost/ back pressure (PI, P2). Cylinder block (6) bottom end is closed by using blocking plates with a provision of oil collection. Oil collection units (12) are fitted with tap & graduated oil measuring tubes (13). Alternatively, pre-weighed oil absorbing papers (11) can be used in combustion chamber to measure minute oil leakages. Oil sump is fitted with electric heater (18) for maintaining oil temperature (Tl) as per requirement.
When the rig is driven, oil pump circulates the oil throughout the oil circuit. The same is also supplied to rocker arm & valves for lubrication. Use of actual cylinder head has facilitated maintaining exact pressure & level of oil above valve guide as experienced during actual engine operation. Oil seals meter amount of oil, which is necessary for lubrication of valve stem & valve guide. If valve guide seals (A) are leaking, excess oil is collected in combustion chamber or on pre-weighed papers. The amount of oil or change in paper weight is used for analysis of oil seal initial performance or for comparison of various seal designs on same set up simultaneously. As actual cylinder head assembly is used as a part of test rig, the same can be removed & fitted on engine for further endurance test. After endurance test on engine, seal performance is again confirmed on test rig. This helps in estimating seal life.
7

Method of testing valve guide seals comprises:
a. Fitment of different seals on cylinder head with all corresponding parts;
b. Fitment of cylinder head on test rig and running test rig as per specified
cycle & duration;
c. Collecting oil leaked through all seals in respective oil collection units;
d. Analysing initial performance of seals based on oil leakage rate;
e. Comparing different seals based on leakage rate;
f. Removing cylinder head from test rig & fitment on actual engine;
g. Endurance of seals on engine as per particular cycle & duration;
h. Checking of oil consumption and port wetting;
i. Removing cylinder head from engine & fitment on test rig;
j. Running test rig again as per particular cycle & duration;
k. Analysing final performance (deterioration) of seals based on oil leakage
rate.
Above said testing can also be separately carried out only for inlet seals by non actuating exhaust seals by removing respective rocker arms and vice versa.
The foregoing description is a specific embodiment of the present invention. It should be appreciated that this embodiment is described for purpose of illustration only, and that numerous alterations and modifications may be practiced by those skilled in the art without departing from the spirit and scope of the invention. It is intended that all such modifications and alterations be included in so far as they come within the scope of the invention as claimed or the equivalents thereof.
8

WE CLAIM
1. Novel test rig for validation of engine valve guide seals comprising of cylinder head assembly, cylinder head cover, inlet & exhaust manifolds, cylinder block, crank shaft, valve train, oil sump, oil pump, oil collection unit, prime mover and mounting means wherein said cylinder block is mounted on mounting means and bottom of said cylinder block is closed with a provision of separate oil collection from one or more cylinder bores, said cylinder head assembly is mounted on cylinder block; crankshaft, cam shaft, valve train, drive train & oil pump are provided inside said cylinder block, said cylinder head cover with inlet manifold and exhaust manifold are mounted on said cylinder head.
2. Novel test rig for validation of engine valve guide seals as claimed in claim 1 wherein said cylinder head assembly comprises of valves, valve guides, valve guide seals, valve spring, and inlet and exhaust ports.
3. Novel test rig for validation of engine valve guide seals as claimed in claim 1 wherein said valve train comprises of cam shaft, tappet, push rod and rocker arm or over head cam shaft with drive unit.
4. Novel test rig for validation of engine valve guide seals as claimed in claims 1 to 3 wherein said cylinder block is having provision for fitment of weighing paper.
5. Novel test rig for validation of engine valve guide seals as claimed in claims 1 to 4 wherein said inlet manifold is provided with boost pressure connection and exhaust manifold is provided with back pressure connection.
9

6. Novel test rig for validation of engine valve guide seals as claimed in claims 1 to 5 wherein said oil sump is provided with electrical heater.
7. Novel test rig for validation of engine valve guide seals as claimed in claims 1 to 6 wherein said rig is further provided with graduated oil measuring units.
8. Method of testing valve guide seals by using test rig for validation of engine valve guide seals as claimed in claims 1 to 7 comprises of
a. Fitment of different seals on cylinder head with all corresponding parts;
b. Fitment of cylinder head on test rig and running test rig as per specified
cycle & duration;
c. Collecting oil leaked through all seals in respective oil collection units;
d. Analysing initial performance of seals based on oil leakage rate;
e. Comparing different seals based on leakage rate;
f. Removing cylinder head from test rig & fitment on actual engine;
g. Endurance of seals on engine as per particular cycle & duration;
h. Checking of oil consumption and port wetting;
i. Removing cylinder head from engine & fitment on test rig; j. Running test rig again as per particular cycle & duration; k. Analysing final performance (deterioration) of seals based on oil leakage rate.
9. Method of testing valve guide seals as claimed in claim 8 wherein said
testing is separately carried out only for inlet seals by non actuating exhaust
seals by removing respective rocker arms or only for exhaust seals by non
actuating inlet seals by removing respective rocker arms.
10

10. Novel test rig for validation of engine valve guide seals and method of testing valve guide seals substantially as herein described with reference to accompanying drawing.

11

ABSTRACT
A Novel Test Rig For Validation Of Engine Valve Guide Seals And Method Of Testing Thereof
This invention relates to test rig and method of testing for validation of engine valve guide seals. Said rig comprises of cylinder head assembly, cylinder head cover, inlet & exhaust manifolds, cylinder block with closed bottom end having provision for oil collection, crank shaft, valve train, provision for fitment of weighing paper, oil collection unit, oil sump, oil pump, oil measuring tubes, prime mover, electric heater, mounting bracket. Said cylinder head assembly further comprises of valves, valve guides, valve guide seals, valve spring, and inlet and exhaust ports. Said valve train further comprises of cam shaft, tappet, push rod and rocker arm. Wherein said cylinder block is mounted on mounting bracket and the bottom of said cylinder block is closed with the provision for oil collection. Said cylinder head assembly is mounted on cylinder block. Crankshaft, cam shaft, valve train, drive train & oil pump are fitted inside said cylinder block. Said cylinder head cover with inlet manifold having provision for boost pressure connection and exhaust manifold having provision for back pressure connection are mounted on cylinder head. Oil sump provided with electrical heater is mounted on modified cylinder block. Graduated oil measuring tubes are mounted on external mounting bracket. Figl

Documents:

2051-MUM-2007-ABSTRACT(29-7-2011).pdf

2051-MUM-2007-ABSTRACT(GRANTED)-(31-5-2012).pdf

2051-mum-2007-abstract.doc

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2051-MUM-2007-CLAIMS(AMENDED)-(29-5-2012).pdf

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2051-MUM-2007-CLAIMS(AMENDED)-(3-5-2012).pdf

2051-MUM-2007-CLAIMS(GRANTED)-(31-5-2012).pdf

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2051-mum-2007-claims.doc

2051-mum-2007-claims.pdf

2051-mum-2007-correspondence(22-11-2007).pdf

2051-MUM-2007-CORRESPONDENCE(29-5-2012).pdf

2051-MUM-2007-CORRESPONDENCE(IPO)-(31-5-2012).pdf

2051-mum-2007-correspondence-received.pdf

2051-mum-2007-description (complete).pdf

2051-MUM-2007-DESCRIPTION(GRANTED)-(31-5-2012).pdf

2051-MUM-2007-DRAWING(15-10-2007).pdf

2051-mum-2007-drawings.pdf

2051-MUM-2007-FORM 1(29-7-2011).pdf

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2051-MUM-2007-FORM 2(GRANTED)-(31-5-2012).pdf

2051-MUM-2007-FORM 2(TITLE PAGE)-(15-10-2007).pdf

2051-MUM-2007-FORM 2(TITLE PAGE)-(GRANTED)-(31-5-2012).pdf

2051-MUM-2007-FORM 2(TITLE PAGE)-)(29-7-2011).pdf

2051-mum-2007-form 8(22-11-2007).pdf

2051-mum-2007-form 9(22-11-2007).pdf

2051-mum-2007-form-1.pdf

2051-mum-2007-form-2.doc

2051-mum-2007-form-2.pdf

2051-mum-2007-form-26.pdf

2051-mum-2007-form-3.pdf

2051-MUM-2007-GENERAL POWER OF ATTORNEY(29-7-2011).pdf

2051-MUM-2007-MARKED COPY(29-7-2011).pdf

2051-MUM-2007-REPLY TO EXAMINATION REPORT(29-7-2011).pdf

2051-MUM-2007-REPLY TO HEARING(3-5-2012).pdf

2051-MUM-2007-SPECIFICATION(AMENDED)-(29-7-2011).pdf

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Patent Number

252799

Indian Patent Application Number

2051/MUM/2007

PG Journal Number

22/2012

Publication Date

01-Jun-2012

Grant Date

31-May-2012

Date of Filing

15-Oct-2007

Name of Patentee

TATA MOTORS LIMITED

Applicant Address

BOMBAY HOUSE, 24 HOMI MODY STREET, HUTATMA CHOWK, MUMBAI

Inventors:

#	Inventor's Name	Inventor's Address
1	AMOL R. DANGARE	BOMBAY HOUSE, 24 HOMI MODY STREET, HUTATMA CHOWK, MUMBAI 400001
2	VIVEK R. JALGAONKAR	BOMBAY HOUSE, 24 HOMI MODY STREET, HUTATMA CHOWK, MUMBAI 400001

PCT International Classification Number

F02B7/02

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA