Title of Invention	AN INTEGRATED SHAFT FOR TWIN CYLINDER INTERNAL COMBUSTION INLINE COMMON RAIL DIESEL ENGINE
Abstract	The integrated shaft in accordance with this invention is provided with a cam lobe integral with said shaft at central portion for driving the high pressure fuel injection diesel pump with two symmetrical semi cylindrical stepped portions at equal distance from the said cam lobe for taking care for the reciprocating mass unbalance along with front driven gear which is mounted on the integrated shaft with provision of solid mass with asymmetrical placed holes in the same phase to provide a drive to the whole assembly from the front side and during mounting it is necessary to ensures that assembly rotates in the opposite direction of crank sliaft. This shaft is also provided with a symmetrically flatten surface at the front-end of the shaft to give a drive to oil pump. This integrated shaft is adopted to be mounted on cylinder block and bedplate assembly. Therefore, the multifold out put from the single shaft is the key feature of this invention.

Title of Invention

AN INTEGRATED SHAFT FOR TWIN CYLINDER INTERNAL COMBUSTION INLINE COMMON RAIL DIESEL ENGINE

Abstract

The integrated shaft in accordance with this invention is provided with a cam lobe integral with said shaft at central portion for driving the high pressure fuel injection diesel pump with two symmetrical semi cylindrical stepped portions at equal distance from the said cam lobe for taking care for the reciprocating mass unbalance along with front driven gear which is mounted on the integrated shaft with provision of solid mass with asymmetrical placed holes in the same phase to provide a drive to the whole assembly from the front side and during mounting it is necessary to ensures that assembly rotates in the opposite direction of crank sliaft. This shaft is also provided with a symmetrically flatten surface at the front-end of the shaft to give a drive to oil pump. This integrated shaft is adopted to be mounted on cylinder block and bedplate assembly. Therefore, the multifold out put from the single shaft is the key feature of this invention.

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 Integrated Shaft For Twin Cylinder Internal Combustion Inline Common Rail Diesel Engine 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 Mr. Milind D. Peshave, Mr. Niraj R. Dharkar 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 complete specification particularly describes the invention and the manner in which it is to be performed. 1 FIELD OF INVENTION This invention relates to internal combustion engine and more particularly to integrated shaft used in twin cylinder internal combustion inline common rail diesel engine for balancing the reciprocating unbalanced mass of an engine and for driving high-pressure fuel injection pump and oil pump. BACKGROUND OF INVENTION Conventionally balancer shaft in automotive application is used for balancing the reciprocating unbalance mass and separate drives are used for driving the oil pump and fuel injection pump. In a two-cylinder high-pressure internal combustion diesel inline engine, for automotive applications multifold requirement from the component such as functional requirement, rigidity and compactness are necessary in order to make system less complex. US6405702 describes the balancer shaft that has a drive member that is interposed in the timing drive and a torsional vibration damper that is interposed between this drive member and the balancer masses on the balancer shaft to avoid transmission of crankshaft vibrations to the balancer shaft without affecting the valve timing. Balancer shaft has at least offset balance masses formed thereon and is also formed with integral bearings mounted directly on opposite sides of each of the balance masses. Above said arrangement have been 2 provided for improving smoothness in engine operation by having a balancer shaft that is driven from the crank shaft and a pair of counter weights provided to balance certain vibration forces of the engine. This prior art teaches only balancing of unbalance mass. OBJECT OF INVENTION The main object of this invention is to provide an integrated shaft for twin cylinder internal combustion inline common rail diesel engine to operate with minimal vibration. Another object of this invention is to provide an integrated shaft which is also responsible to provide drive to high-pressure diesel fuel injection pump and oil pump. Yet another object of this invention is to provide an integrated shaft, which is simple in construction and cost effective. STATEMENT OF INVENTION A novel integrated shaft for twin cylinder internal combustion inline common rail diesel engine consists of at least four cylindrical surfaces integrally provided on said shaft to support on cylinder block and bed plate assembly wherein said shaft have a integral cam lobe at centre to provide drive to cylinder block mounted high-pressure diesel fuel injection pump, two symmetrical semi 3 cylindrical stepped portions at equi-distance from the said cam lobe, a symmetrical flat surface on opposite side at the front-end of the said shaft to give a drive to oil pump and a drive gear provided at front of the said shaft. SUMMARY OF INVENTION The integrated shaft in accordance with this invention is provided with a cam lobe integral with said shaft at central portion for driving the high pressure fuel injection diesel pump with two symmetrical semi cylindrical stepped portions at equal distance from the said cam lobe for taking care for the reciprocating mass unbalance along with front driven gear which is mounted on the integrated shaft with provision of solid mass in the same phase by providing asymmetrically placed holes to provide a drive to the whole assembly from the front side and during mounting it is necessary to ensures that assembly rotates in the opposite direction of crank shaft. This shaft is also provided with a symmetrically flatten surface at the front-end of the shaft to give a drive to oil pump. This integrated shaft is adopted to be mounted on cylinder block and bedplate assembly. Therefore, the multifold out put from the single shaft is the key feature of this invention. 4 DESCRIPTION OF THE PREFFRED EMBODIMENT Referring now to the drawings 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, Figure 1 shows isometric view of integrated shaft in accordance with this invention. Figure 2 shows front view of integrated shaft Figure 3 shows integrated shaft mounted with gear Figure 4 shows drive for oil pump from integrated shaft Figure 5 shows drive for high pressure pump from integrated shaft Referring to figs. 1 to 5 the integrated shaft (A) is provided with a cam lobe (5) integral with said shaft at central portion and two symmetrical semi cylindrical stepped portions (6) at equal distance from the said cam lobe for the purpose of balancing the reciprocating unbalance mass during running mode. The said cam lobe (5) is provided to drive cylinder block mounted high-pressure diesel fuel injection pump (15) and there is also provided a symmetrically flatten surface (7) at the front-end of the said shaft to give a drive to oil pump (12). The integrated shaft is provided with two integral cylindrical surfaces (2, 3) on both the side of said cam lobe (5) and two integral cylindrical surfaces (1,4) touching to said symmetrical semi cylindrical stepped portions (6) in order to provide space to locate on cylinder block (13) and bedplate (14) assembly rigidly. 5 Provision (8) is made on the integrated shaft to locate the driven gear and this driven gear (10) is mounted on the said provision (8), said gear is also provided with solid mass (11) with asymmetrical holes for balancing the reciprocating unbalance mass of an engine. The whole assembly of integrated shaft gets a drive from the front side and it should be ensured that assembly rotates in the opposite direction of crank shaft and functions best for the reciprocating mass unbalance reduction. Semi cylindrical surfaces (6) are merged with the cylindrical surfaces (1, 2, 3, and 4) with a curved profile (9) to ensure rigidity under fluctuating loads arising from the engine. The driven gear (10) have the teeth matching with the corresponding teeth of crank gear, ensures smooth motion transmission with 1:1 ratio and also ensures the opposite phase of motion for integrated shaft with respect to crank shaft. An integrated shaft in accordance with this invention is provided in vehicle internal combustion engine in such a way that its central axis is parallel to crankshaft axis and both the axis are located in the same horizontal plane mounted between cylinder bock (13) and bedplate (14). The integrated shaft in accordance with this invention carries out the following functions: 6 A] Balances the primary reciprocating masses. B] Provides drive to high-pressure diesel fuel injection pump. C] Provides a drive for oil pump. 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 insofar as they come within the scope of the invention as claimed or the equivalents thereof 7 WE CLAIM 1. A novel integrated shaft for twin cylinder internal combustion inline common rail diesel engine consists of at least four cylindrical surfaces integrally provided on said shaft to support on cylinder block and bed plate assembly wherein said shaft have a integral cam lobe at centre to provide drive to cylinder block mounted high-pressure diesel fuel injection pump, two symmetrical semi cylindrical stepped portions at equi-distance from the said cam lobe, a symmetrical flat surface on opposite side at the front-end to give a drive to oil pump and a drive gear provided at front of the said shaft. 2. The integrated shaft as claimed in claim 1 wherein said semi cylindrical stepped portions are merged with the said cylindrical surfaces with a curved profile. 3. The integrated shaft as claimed in claim 1 & 2 wherein said drive gear is provided with solid mass in the same phase of said cylindrical stepped portions by providing asymmetrically placed holes for balancing the reciprocating unbalance mass of an engine. 4. The integrated shaft as claimed in claims 1 to 3 wherein the driven gear has the teeth matching with the corresponding teeth of crank gear. 8 5. The integrated shaft as claimed in claims 1 to 4, where in its central axis is parallel to crankshaft axis and both the axis are located in the same horizontal plane mounted between cylinder block and bedplate. 6. The internal combustion diesel engine fitted with integrated shaft as claimed in claims 1 to 5. 7. Vehicle fitted with internal combustion diesel engine having integrated shaft as claimed in claims 1 to 6. 8. The integrated shaft substantially as herein described with reference to accompanying drawings. Dated this 29th day of March 2007 TATA MOTORS LIMITED By their Agent and Attorney (KARUNA GOLERJA) of DePENNING & DePENNING 9 ABSTRACT A Novel Integrated Shaft For Twin Cylinder Internal Combustion Inline Common Rail Diesel Engine The integrated shaft in accordance with this invention is provided with a cam lobe integral with said shaft at central portion for driving the high pressure fuel injection diesel pump with two symmetrical semi cylindrical stepped portions at equal distance from the said cam lobe for taking care for the reciprocating mass unbalance along with front driven gear which is mounted on the integrated shaft with provision of solid mass with asymmetrical placed holes in the same phase to provide a drive to the whole assembly from the front side and during mounting it is necessary to ensures that jassembly rotates in the opposite direction of crank sliaft. This shaft is also provided with a symmetrically flatten surface at the front-end of the shaft to give a drive to oil pump. This integrated shaft is adopted to-be mounted on cylinder block and bedplate assembly. Therefore, the multifold out put from the single shaft is the key feature of this invention. ,-^.

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 Integrated Shaft For Twin Cylinder Internal Combustion Inline Common Rail Diesel Engine
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
Mr. Milind D. Peshave, Mr. Niraj R. Dharkar
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 complete specification particularly describes the invention and the manner in which it is to be performed.
1

FIELD OF INVENTION
This invention relates to internal combustion engine and more particularly to integrated shaft used in twin cylinder internal combustion inline common rail diesel engine for balancing the reciprocating unbalanced mass of an engine and for driving high-pressure fuel injection pump and oil pump.
BACKGROUND OF INVENTION
Conventionally balancer shaft in automotive application is used for balancing the reciprocating unbalance mass and separate drives are used for driving the oil pump and fuel injection pump.
In a two-cylinder high-pressure internal combustion diesel inline engine, for automotive applications multifold requirement from the component such as functional requirement, rigidity and compactness are necessary in order to make system less complex.
US6405702 describes the balancer shaft that has a drive member that is interposed in the timing drive and a torsional vibration damper that is interposed between this drive member and the balancer masses on the balancer shaft to avoid transmission of crankshaft vibrations to the balancer shaft without affecting the valve timing. Balancer shaft has at least offset balance masses formed thereon and is also formed with integral bearings mounted directly on opposite sides of each of the balance masses. Above said arrangement have been
2

provided for improving smoothness in engine operation by having a balancer shaft that is driven from the crank shaft and a pair of counter weights provided to balance certain vibration forces of the engine. This prior art teaches only balancing of unbalance mass.
OBJECT OF INVENTION
The main object of this invention is to provide an integrated shaft for twin cylinder internal combustion inline common rail diesel engine to operate with minimal vibration.
Another object of this invention is to provide an integrated shaft which is also responsible to provide drive to high-pressure diesel fuel injection pump and oil pump.
Yet another object of this invention is to provide an integrated shaft, which is simple in construction and cost effective.
STATEMENT OF INVENTION
A novel integrated shaft for twin cylinder internal combustion inline common rail diesel engine consists of at least four cylindrical surfaces integrally provided on said shaft to support on cylinder block and bed plate assembly wherein said shaft have a integral cam lobe at centre to provide drive to cylinder block mounted high-pressure diesel fuel injection pump, two symmetrical semi
3

cylindrical stepped portions at equi-distance from the said cam lobe, a symmetrical flat surface on opposite side at the front-end of the said shaft to give a drive to oil pump and a drive gear provided at front of the said shaft.
SUMMARY OF INVENTION
The integrated shaft in accordance with this invention is provided with a cam lobe integral with said shaft at central portion for driving the high pressure fuel injection diesel pump with two symmetrical semi cylindrical stepped portions at equal distance from the said cam lobe for taking care for the reciprocating mass unbalance along with front driven gear which is mounted on the integrated shaft with provision of solid mass in the same phase by providing asymmetrically placed holes to provide a drive to the whole assembly from the front side and during mounting it is necessary to ensures that assembly rotates in the opposite direction of crank shaft. This shaft is also provided with a symmetrically flatten surface at the front-end of the shaft to give a drive to oil pump.
This integrated shaft is adopted to be mounted on cylinder block and bedplate assembly.
Therefore, the multifold out put from the single shaft is the key feature of this invention.
4

DESCRIPTION OF THE PREFFRED EMBODIMENT
Referring now to the drawings 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,
Figure 1 shows isometric view of integrated shaft in accordance with this
invention.
Figure 2 shows front view of integrated shaft
Figure 3 shows integrated shaft mounted with gear
Figure 4 shows drive for oil pump from integrated shaft
Figure 5 shows drive for high pressure pump from integrated shaft
Referring to figs. 1 to 5 the integrated shaft (A) is provided with a cam lobe (5) integral with said shaft at central portion and two symmetrical semi cylindrical stepped portions (6) at equal distance from the said cam lobe for the purpose of balancing the reciprocating unbalance mass during running mode. The said cam lobe (5) is provided to drive cylinder block mounted high-pressure diesel fuel injection pump (15) and there is also provided a symmetrically flatten surface (7) at the front-end of the said shaft to give a drive to oil pump (12).
The integrated shaft is provided with two integral cylindrical surfaces (2, 3) on both the side of said cam lobe (5) and two integral cylindrical surfaces (1,4) touching to said symmetrical semi cylindrical stepped portions (6) in order to provide space to locate on cylinder block (13) and bedplate (14) assembly rigidly.
5

Provision (8) is made on the integrated shaft to locate the driven gear and this driven gear (10) is mounted on the said provision (8), said gear is also provided with solid mass (11) with asymmetrical holes for balancing the reciprocating unbalance mass of an engine. The whole assembly of integrated shaft gets a drive from the front side and it should be ensured that assembly rotates in the opposite direction of crank shaft and functions best for the reciprocating mass unbalance reduction.
Semi cylindrical surfaces (6) are merged with the cylindrical surfaces (1, 2, 3, and 4) with a curved profile (9) to ensure rigidity under fluctuating loads arising from the engine.
The driven gear (10) have the teeth matching with the corresponding teeth of crank gear, ensures smooth motion transmission with 1:1 ratio and also ensures the opposite phase of motion for integrated shaft with respect to crank shaft.
An integrated shaft in accordance with this invention is provided in vehicle internal combustion engine in such a way that its central axis is parallel to crankshaft axis and both the axis are located in the same horizontal plane mounted between cylinder bock (13) and bedplate (14).
The integrated shaft in accordance with this invention carries out the following functions:
6

A] Balances the primary reciprocating masses.
B] Provides drive to high-pressure diesel fuel injection pump.
C] Provides a drive for oil pump.
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 insofar as they come within the scope of the invention as claimed or the equivalents thereof
7

WE CLAIM
1. A novel integrated shaft for twin cylinder internal combustion inline common rail diesel engine consists of at least four cylindrical surfaces integrally provided on said shaft to support on cylinder block and bed plate assembly wherein said shaft have a integral cam lobe at centre to provide drive to cylinder block mounted high-pressure diesel fuel injection pump, two symmetrical semi cylindrical stepped portions at equi-distance from the said cam lobe, a symmetrical flat surface on opposite side at the front-end to give a drive to oil pump and a drive gear provided at front of the said shaft.
2. The integrated shaft as claimed in claim 1 wherein said semi cylindrical stepped portions are merged with the said cylindrical surfaces with a curved profile.
3. The integrated shaft as claimed in claim 1 & 2 wherein said drive gear is provided with solid mass in the same phase of said cylindrical stepped portions by providing asymmetrically placed holes for balancing the reciprocating unbalance mass of an engine.
4. The integrated shaft as claimed in claims 1 to 3 wherein the driven gear has the teeth matching with the corresponding teeth of crank gear.
8

5. The integrated shaft as claimed in claims 1 to 4, where in its central axis is parallel to crankshaft axis and both the axis are located in the same horizontal plane mounted between cylinder block and bedplate.
6. The internal combustion diesel engine fitted with integrated shaft as claimed in claims 1 to 5.
7. Vehicle fitted with internal combustion diesel engine having integrated shaft as claimed in claims 1 to 6.
8. The integrated shaft substantially as herein described with reference to accompanying drawings.
Dated this 29th day of March 2007
TATA MOTORS LIMITED By their Agent and Attorney

(KARUNA GOLERJA)
of DePENNING & DePENNING
9

ABSTRACT
A Novel Integrated Shaft For Twin Cylinder Internal Combustion Inline Common Rail Diesel Engine
The integrated shaft in accordance with this invention is provided with a cam
lobe integral with said shaft at central portion for driving the high pressure fuel
injection diesel pump with two symmetrical semi cylindrical stepped portions at
equal distance from the said cam lobe for taking care for the reciprocating mass
unbalance along with front driven gear which is mounted on the integrated shaft
with provision of solid mass with asymmetrical placed holes in the same phase
to provide a drive to the whole assembly from the front side and during
mounting it is necessary to ensures that jassembly rotates in the opposite
direction of crank sliaft. This shaft is also provided with a symmetrically flatten
surface at the front-end of the shaft to give a drive to oil pump. This integrated
shaft is adopted to-be mounted on cylinder block and bedplate assembly.
Therefore, the multifold out put from the single shaft is the key feature of this
invention. ,-^.

AN INTEGRATED SHAFT FOR TWIN CYLINDER INTERNAL COMBUSTION INLINE COMMON RAIL DIESEL ENGINE

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