Title of Invention	TWIN CYLINDER TURBOCHARGED INTER COOLED INTERNAL COMBUSTION ENGINE
Abstract	This invention relates to a novel twin cylinder turbocharged inter cooled internal combustion engine comprises of crank train with its housing, combustion chambers, valve train and its housing, manifolds, flywheel, turbocharger, exhaust gas recirculation system and intercooler, wherein said combustion chambers are pre-combustion chamber and main combustion chamber, wherein pre-combustion chamber is provided in the cylinder head and main combustion chamber is provided in piston, said turbocharger is mounted on exhaust manifold and exhaust gas recirculation valve is mounted on inlet manifold and is interconnected with inlet and exhaust manifolds, said intercooler is provided in between compressor outlet of said turbocharger and at inlet of said intake manifold.

Title of Invention

TWIN CYLINDER TURBOCHARGED INTER COOLED INTERNAL COMBUSTION ENGINE

Abstract

This invention relates to a novel twin cylinder turbocharged inter cooled internal combustion engine comprises of crank train with its housing, combustion chambers, valve train and its housing, manifolds, flywheel, turbocharger, exhaust gas recirculation system and intercooler, wherein said combustion chambers are pre-combustion chamber and main combustion chamber, wherein pre-combustion chamber is provided in the cylinder head and main combustion chamber is provided in piston, said turbocharger is mounted on exhaust manifold and exhaust gas recirculation valve is mounted on inlet manifold and is interconnected with inlet and exhaust manifolds, said intercooler is provided in between compressor outlet of said turbocharger and at inlet of said intake manifold.

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 Novel Twin Cylinder Turbocharged Inter Cooled Internal Combustion 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. Dattatraya R. Katkar, Mr. Rajesh V. Bhandari, 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. FIELD OF INVENTION This invention relates to internal combustion engine and more particularly it relates to novel twin cylinder turbocharged intercooled engine. BACKGROUND OF INVENTION In order to increase the specific power of IC engine, turbochargers and inter coolers are used and conventionally turbo charging of internal combustion engine is being done up to minimum three cylinder engines. Twin cylinder turbocharged intercooled IC engines and the conversion of twin cylinder naturally aspirated engines to turbocharged intercooled engine has been an aspiration of the internal combustion engine industry for a period of time, to improve the power density of engine. This need is more prominent in Automobile industry because of growing demand for small vehicles with compact engine having higher specific power density. OBJECTS OF THIS INVENTION The main object of this invention is to provide a novel twin cylinder turbocharged intercooled IC engine Yet another object of this invention is to provide a method to convert twin cylinder naturally aspirated internal combustion engine to turbocharged intercooled engine. Yet another object of this invention is to provide a novel twin cylinder turbocharged intercooled IC engine which can achieve the negative crankcase pressure with even firing order. Yet another object of this invention is to provide a novel twin cylinder turbocharged intercooled IC engine with a provision for exhaust gas re-circulation. Yet another object of this invention is to provide a novel twin cylinder turbocharged intercooled IC engine which is simple in construction and cost effective. STATEMENT OF INVENTION A novel twin cylinder turbocharged inter cooled internal combustion engine comprises of crank train with its housing , combustion chambers, valve train and its housing, manifolds, flywheel, turbocharger, exhaust gas re-circulation system and intercooler, wherein said combustion chambers are pre-combustion chamber and main combustion chamber, wherein pre-combustion chamber is provided in the cylinder head and main combustion chamber is provided in piston, said turbocharger is mounted on exhaust manifold and exhaust gas re-circulation valve is mounted on inlet manifold and is interconnected with inlet and exhaust manifolds, said intercooler is provided in between compressor outlet of said turbocharger and at inlet of said intake manifold. BRIEF DESCRIPTION OF INVENTION A novel twin cylinder turbocharged intercooled IC engine in accordance with this invention basically comprises crank train with its housing , combustion chamber, valve train and its housing, manifolds, flywheel, turbocharger with a provision of exhaust gas re-circulation and intercooler. Said crank train primarily comprises of crankshaft, connecting rod, Piston with piston rings. Said valve train comprises of cam shaft, inlet and exhaust valves. Said valve train housing comprises cylinder head, inlet and exhaust ports and combustion chambers. Wherein said crank train housing houses crankshaft at its bottom, piston with rings is connected to the crankshaft by a connecting rod, flywheel with provision for speed sensing, is mounted on crankshaft rear end. Said combustion chambers are pre-combustion chamber and main combustion chamber, wherein pre-combustion chamber is provided in the cylinder head and main combustion chamber is provided in piston. Intake and exhaust valves are actuated by direct acting overhead camshaft. Intake and exhaust ports are provided on the same side of the cylinder head. Intake and exhaust manifolds connect ports to intake and exhaust system respectively. Fuel injectors are provided on opposite side of said ports. Said turbocharger is mounted on exhaust manifold and exhaust gas recirculation valve is mounted on inlet manifold and is interconnected with inlet and exhaust manifolds. Said intercooler is provided in between compressor outlet of said turbocharger and at inlet of said intake manifold. Said cylinder head has a provision of external oil return alongwith internal oil return to crankcase, required for naturally aspirated engine. BRIEF DESCRIPTION OF DRAWINGS Fig. 1 shows an isometric view of a novel twin cylinder turbocharged intercooled IC engine. Fig. 2 shows manifold side view of a novel twin cylinder turbocharged intercooled IC engine. Fig. 3 shows oil filter side view of a novel twin cylinder turbocharged intercooled IC engine. Fig. 4 shows oil return passage from cylinder head of a novel twin cylinder turbocharged intercooled IC engine. Fig. 5 & 6 shows the cut sections of cylinder head of a twin cylinder turbocharged intercooled IC engine. Fig. 7 shows intercooler of a twin cylinder turbocharged intercooled IC engine. Fig. 8 shows the cut section of crank train of a twin cylinder turbocharged intercooled IC engine. DESCRIPTION OF PREFFERED EMBODIMENTS Referring now to the drawings Fig. 1 to 8, 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, A novel twin cylinder turbocharged intercooled IC engine in accordance with this invention mainly comprises crank train with its housing, combustion chamber (14,15), valve train and its housing, manifolds (3,4), flywheel (16), turbocharger (5) with a provision of exhaust gas recirculation and intercooler (17). Said crank train primarily comprises of crankshaft (18), connecting rod (19), Piston (20) with piston rings. Said valve train comprises of cam shaft (21), inlet and exhaust valves (22,23). Said valve train housing comprises cylinder head (2), inlet and exhaust ports (24,25) and combustion chambers (14,15). Wherein said crank train housing houses crankshaft (18) at its bottom, piston with rings is connected to the crankshaft by a connecting rod (19), flywheel (16) with provision for speed sensing, is connected to crankshaft rear end. Said combustion chambers are pre-combustion chamber (15) and main combustion chamber (14), wherein said pre-combustion chamber (15) is provided in the cylinder head (2) and main combustion chamber (14) is provided in piston (20). Intake and exhaust valves (22,23) are actuated by direct acting overhead camshaft (21). Intake and exhaust ports (24,25) are provided on the same side of the cylinder head. Intake and exhaust manifolds connect ports to intake and exhaust system respectively. Fuel injectors (26) are provided on opposite side of said ports. Said turbocharger (5) is mounted on exhaust manifold (4) and exhaust gas recirculation valve (6) is mounted on inlet manifold (3) and is interconnected with inlet and exhaust manifolds (3,4). Said intercooler (17) is provided in between compressor outlet of said turbocharger and at inlet of said intake manifold. Said cylinder head (2) has a provision of external oil return (10) along with internal oil return (27) to sump, required for naturally aspirated engine. Said engine has got a provision of mounting EGR valve (6) on said inlet manifold. EGR tube (13) is provided in between EGR valve (6) and exhaust manifold (4) to mix the exhaust gases with fresh air in intake system. It will be appreciated by those skilled in the art that, features of exhaust manifold (4) takes care of pulse effects, attributed to the firing interval duration for twin cylinder engine as this has got a major effect on turbocharger effectiveness. EGR valve location is provided such that, distribution of exhaust gases is uniform in both runners of intake manifold & thereafter in intake ports. Said cylinder block (1) is provided with cross holes between two cylinders, to take additional heat load. On cylinder block, there is a provision of piston cooling nozzle for better cooling of piston. For even firing order of engine, the dead space volume inside crankcase is increased, to minimize the effect of build-up of crankcase pressure & achieve negative crankcase pressure. Increase in dead space volume is achieved by increased oil sump width across crankcase. The oil sump (7) is connected to cylinder crankcase through ladder frame (8), which also helps for structural rigidity. The blow-by gases of cylinder crankcase are taken back to turbocharger inlet, externally, through engine mounted breather (9). Opening of blow by gas connection on oil sump (7) is kept above maximum oil level in oil sump. Blow-by gases from cylinder crankcase to intake system & breather separated oil return to sump, both flows through common pipe (11). Return passage (10) of engine oil from cylinder head & turbocharger is also routed externally & connected to oil sump such that, it will always enter below minimum level of oil, in oil sump (7). The blow-by passage & oil passage are provided such that, there is minimum mixing of oil with blow-by. The internal oil return passage & blow-by passage are provided in such a way that, both can be used for naturally aspirated engine, with minimum effort & without affecting engine performance. The features of the said intercooler provided is such a way that there should be a minimum drop in charge pressure, so that optimum turbocharger performance can be obtained. Said engine will also work even if the intercooler is eliminated from the circuit. The fuel injection system is distributor type pump (12) with boost capsule, which controls the fuel delivery, by sensing the boost pressure, from intake manifold. 1 Cylinder block 15 PreCC 2 Cylinder head 16 Flywheel 3 Intake manifold 17 Intercooler 4 Exhaust manifold 18 Crankshaft 5 Turbocharger 19 Connecting rod 6 EGR valve 20 Piston 7 Oil sump 21 Camshaft 8 Ladder frame 22 Inlet valve 9 Breather 23 Exhaust valve 10 Oil return passage 24 Inlet port 11 Blow-by tube 25 Exh port 12 FIP 26 Fuel injectors 13 EGR tube 27 Internal oil return passage 14 Main CC 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. WE CLAIM 1 A novel twin cylinder turbocharged inter cooled internal combustion engine comprises of crank train with its housing , combustion chambers, valve train and its housing, manifolds, flywheel, turbocharger, exhaust gas recirculation system and intercooler, wherein said combustion chambers are pre-combustion chamber and main combustion chamber, wherein pre-combustion chamber is provided in the cylinder head and main combustion chamber is provided in piston, said turbocharger is mounted on exhaust manifold and exhaust gas recirculation valve is mounted on inlet manifold and is interconnected with inlet and exhaust manifolds, said intercooler is provided in between compressor outlet of said turbocharger and at inlet of said intake manifold. 2 The novel twin cylinder turbocharged inter cooled internal combustion engine as claimed in claim 1 wherein said crank train primarily comprises of crankshaft, connecting rod, Piston with piston rings and crank train housing is provided with cross holes between two cylinders to take additional heat load and provision of piston cooling jet for better cooling of piston. 3 The novel twin cylinder turbocharged inter cooled internal combustion engine as claimed in claims 1 and 2, wherein said engine is provided with externally routed blow-by gas path from cylinder crankcase to breather & then connected to compressor inlet and external oil return path from cylinder head to oil sump. 4 The novel twin cylinder turbocharged inter cooled internal combustion engine as claimed in claims 1 to 3 wherein said engine is provided with inlet and exhaust ports on same side of cylinder head and fuel injectors on opposite side of said ports. 5 The novel twin cylinder turbocharged inter cooled internal combustion engine as claimed in claims 1 to 4 wherein said flywheel is having a provision of speed sensing and is mounted on rear end of crankshaft. 6 The novel twin cylinder turbocharged inter cooled internal combustion engine as claimed in claims 1 to 5 wherein said engine is provided with sufficient dead space volume in crank case and blow by passage to achieve the negative crankcase pressure with even firing order, without any control valve. 7 The novel twin cylinder turbocharged inter cooled internal combustion engine as claimed in claims 1 to 6 wherein exhaust conduits of both cylinder are combined before entering into turbine housing. 8 The novel twin cylinder naturally aspirated internal combustion engine comprises of crank train with its housing, combustion chambers, valve train and its housing, manifolds, and flywheel, wherein said combustion chambers are pre-combustion chamber and main combustion chamber, wherein pre-combustion chamber is provided in the cylinder head and main combustion chamber is provided in piston, intake and exhaust valves are actuated by direct acting overhead camshaft, intake and exhaust ports are provided on the same side of the cylinder head, intake and exhaust manifolds connect ports to intake and exhaust system respectively, fuel injectors are provided on opposite side of said ports, said cylinder head is provided with a provision of external oil return along with internal oil return to crankcase and internal blow by gas path. 9 Vehicle fitted with internal combustion engine as claimed in claims 1 to 8. 10 The novel twin cylinder turbocharged inter cooled internal combustion engine substantially as herein described with reference to accompanying drawings.

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
Novel Twin Cylinder Turbocharged Inter Cooled Internal Combustion 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. Dattatraya R. Katkar, Mr. Rajesh V. Bhandari,
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.

FIELD OF INVENTION
This invention relates to internal combustion engine and more particularly it relates to novel twin cylinder turbocharged intercooled engine.
BACKGROUND OF INVENTION
In order to increase the specific power of IC engine, turbochargers and inter coolers are used and conventionally turbo charging of internal combustion engine is being done up to minimum three cylinder engines.
Twin cylinder turbocharged intercooled IC engines and the conversion of twin cylinder naturally aspirated engines to turbocharged intercooled engine has been an aspiration of the internal combustion engine industry for a period of time, to improve the power density of engine. This need is more prominent in Automobile industry because of growing demand for small vehicles with compact engine having higher specific power density.
OBJECTS OF THIS INVENTION
The main object of this invention is to provide a novel twin cylinder turbocharged intercooled IC engine
Yet another object of this invention is to provide a method to convert twin cylinder naturally aspirated internal combustion engine to turbocharged intercooled engine.
Yet another object of this invention is to provide a novel twin cylinder turbocharged intercooled IC engine which can achieve the negative crankcase pressure with even firing order.

Yet another object of this invention is to provide a novel twin cylinder turbocharged intercooled IC engine with a provision for exhaust gas re-circulation. Yet another object of this invention is to provide a novel twin cylinder turbocharged intercooled IC engine which is simple in construction and cost effective.
STATEMENT OF INVENTION
A novel twin cylinder turbocharged inter cooled internal combustion engine comprises of crank train with its housing , combustion chambers, valve train and its housing, manifolds, flywheel, turbocharger, exhaust gas re-circulation system and intercooler, wherein said combustion chambers are pre-combustion chamber and main combustion chamber, wherein pre-combustion chamber is provided in the cylinder head and main combustion chamber is provided in piston, said turbocharger is mounted on exhaust manifold and exhaust gas re-circulation valve is mounted on inlet manifold and is interconnected with inlet and exhaust manifolds, said intercooler is provided in between compressor outlet of said turbocharger and at inlet of said intake manifold.
BRIEF DESCRIPTION OF INVENTION
A novel twin cylinder turbocharged intercooled IC engine in accordance with this invention basically comprises crank train with its housing , combustion chamber, valve train and its housing, manifolds, flywheel, turbocharger with a provision of exhaust gas re-circulation and intercooler. Said crank train primarily comprises of crankshaft, connecting rod, Piston with piston rings. Said valve train comprises of cam shaft, inlet and exhaust valves. Said valve train housing comprises cylinder head, inlet and exhaust ports and combustion chambers.
Wherein said crank train housing houses crankshaft at its bottom, piston with rings is connected to the crankshaft by a connecting rod, flywheel with provision for speed sensing, is mounted on crankshaft rear end.

Said combustion chambers are pre-combustion chamber and main combustion chamber, wherein pre-combustion chamber is provided in the cylinder head and main combustion chamber is provided in piston. Intake and exhaust valves are actuated by direct acting overhead camshaft. Intake and exhaust ports are provided on the same side of the cylinder head. Intake and exhaust manifolds connect ports to intake and exhaust system respectively. Fuel injectors are provided on opposite side of said ports. Said turbocharger is mounted on exhaust manifold and exhaust gas recirculation valve is mounted on inlet manifold and is interconnected with inlet and exhaust manifolds. Said intercooler is provided in between compressor outlet of said turbocharger and at inlet of said intake manifold.
Said cylinder head has a provision of external oil return alongwith internal oil return to crankcase, required for naturally aspirated engine.
BRIEF DESCRIPTION OF DRAWINGS
Fig. 1 shows an isometric view of a novel twin cylinder turbocharged intercooled IC
engine.
Fig. 2 shows manifold side view of a novel twin cylinder turbocharged intercooled IC
engine.
Fig. 3 shows oil filter side view of a novel twin cylinder turbocharged intercooled IC
engine.
Fig. 4 shows oil return passage from cylinder head of a novel twin cylinder turbocharged
intercooled IC engine.
Fig. 5 & 6 shows the cut sections of cylinder head of a twin cylinder turbocharged
intercooled IC engine.
Fig. 7 shows intercooler of a twin cylinder turbocharged intercooled IC engine.
Fig. 8 shows the cut section of crank train of a twin cylinder turbocharged intercooled IC
engine.

DESCRIPTION OF PREFFERED EMBODIMENTS
Referring now to the drawings Fig. 1 to 8, 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,
A novel twin cylinder turbocharged intercooled IC engine in accordance with this invention mainly comprises crank train with its housing, combustion chamber (14,15), valve train and its housing, manifolds (3,4), flywheel (16), turbocharger (5) with a provision of exhaust gas recirculation and intercooler (17). Said crank train primarily comprises of crankshaft (18), connecting rod (19), Piston (20) with piston rings. Said valve train comprises of cam shaft (21), inlet and exhaust valves (22,23). Said valve train housing comprises cylinder head (2), inlet and exhaust ports (24,25) and combustion chambers (14,15).
Wherein said crank train housing houses crankshaft (18) at its bottom, piston with rings is connected to the crankshaft by a connecting rod (19), flywheel (16) with provision for speed sensing, is connected to crankshaft rear end.
Said combustion chambers are pre-combustion chamber (15) and main combustion chamber (14), wherein said pre-combustion chamber (15) is provided in the cylinder head (2) and main combustion chamber (14) is provided in piston (20). Intake and exhaust valves (22,23) are actuated by direct acting overhead camshaft (21). Intake and exhaust ports (24,25) are provided on the same side of the cylinder head. Intake and exhaust manifolds connect ports to intake and exhaust system respectively. Fuel injectors (26) are provided on opposite side of said ports. Said turbocharger (5) is mounted on exhaust manifold (4) and exhaust gas recirculation valve (6) is mounted on inlet manifold (3) and is interconnected with inlet and exhaust manifolds (3,4). Said intercooler (17) is provided in between compressor outlet of said turbocharger and at inlet of said intake manifold.

Said cylinder head (2) has a provision of external oil return (10) along with internal oil return (27) to sump, required for naturally aspirated engine.
Said engine has got a provision of mounting EGR valve (6) on said inlet manifold. EGR tube (13) is provided in between EGR valve (6) and exhaust manifold (4) to mix the exhaust gases with fresh air in intake system. It will be appreciated by those skilled in the art that, features of exhaust manifold (4) takes care of pulse effects, attributed to the firing interval duration for twin cylinder engine as this has got a major effect on turbocharger effectiveness. EGR valve location is provided such that, distribution of exhaust gases is uniform in both runners of intake manifold & thereafter in intake ports.
Said cylinder block (1) is provided with cross holes between two cylinders, to take additional heat load. On cylinder block, there is a provision of piston cooling nozzle for better cooling of piston. For even firing order of engine, the dead space volume inside crankcase is increased, to minimize the effect of build-up of crankcase pressure & achieve negative crankcase pressure. Increase in dead space volume is achieved by increased oil sump width across crankcase. The oil sump (7) is connected to cylinder crankcase through ladder frame (8), which also helps for structural rigidity. The blow-by gases of cylinder crankcase are taken back to turbocharger inlet, externally, through engine mounted breather (9). Opening of blow by gas connection on oil sump (7) is kept above maximum oil level in oil sump. Blow-by gases from cylinder crankcase to intake system & breather separated oil return to sump, both flows through common pipe (11).
Return passage (10) of engine oil from cylinder head & turbocharger is also routed externally & connected to oil sump such that, it will always enter below minimum level of oil, in oil sump (7). The blow-by passage & oil passage are provided such that, there is minimum mixing of oil with blow-by.
The internal oil return passage & blow-by passage are provided in such a way that, both can be used for naturally aspirated engine, with minimum effort & without affecting engine performance. The features of the said intercooler provided is such a way that

there should be a minimum drop in charge pressure, so that optimum turbocharger performance can be obtained.
Said engine will also work even if the intercooler is eliminated from the circuit.
The fuel injection system is distributor type pump (12) with boost capsule, which controls the fuel delivery, by sensing the boost pressure, from intake manifold.

1 Cylinder block 15 PreCC
2 Cylinder head 16 Flywheel
3 Intake manifold 17 Intercooler
4 Exhaust manifold 18 Crankshaft
5 Turbocharger 19 Connecting rod
6 EGR valve 20 Piston
7 Oil sump 21 Camshaft
8 Ladder frame 22 Inlet valve
9 Breather 23 Exhaust valve
10 Oil return passage 24 Inlet port
11 Blow-by tube 25 Exh port
12 FIP 26 Fuel injectors
13 EGR tube 27 Internal oil return passage
14 Main CC
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.

WE CLAIM
1 A novel twin cylinder turbocharged inter cooled internal combustion engine
comprises of crank train with its housing , combustion chambers, valve train and
its housing, manifolds, flywheel, turbocharger, exhaust gas recirculation system
and intercooler, wherein said combustion chambers are pre-combustion chamber
and main combustion chamber, wherein pre-combustion chamber is provided in
the cylinder head and main combustion chamber is provided in piston, said
turbocharger is mounted on exhaust manifold and exhaust gas recirculation valve
is mounted on inlet manifold and is interconnected with inlet and exhaust
manifolds, said intercooler is provided in between compressor outlet of said
turbocharger and at inlet of said intake manifold.
2 The novel twin cylinder turbocharged inter cooled internal combustion engine as claimed in claim 1 wherein said crank train primarily comprises of crankshaft, connecting rod, Piston with piston rings and crank train housing is provided with cross holes between two cylinders to take additional heat load and provision of piston cooling jet for better cooling of piston.
3 The novel twin cylinder turbocharged inter cooled internal combustion engine as claimed in claims 1 and 2, wherein said engine is provided with externally routed blow-by gas path from cylinder crankcase to breather & then connected to compressor inlet and external oil return path from cylinder head to oil sump.
4 The novel twin cylinder turbocharged inter cooled internal combustion engine as claimed in claims 1 to 3 wherein said engine is provided with inlet and exhaust ports on same side of cylinder head and fuel injectors on opposite side of said ports.
5 The novel twin cylinder turbocharged inter cooled internal combustion engine as claimed in claims 1 to 4 wherein said flywheel is having a provision of speed sensing and is mounted on rear end of crankshaft.

6 The novel twin cylinder turbocharged inter cooled internal combustion engine as claimed in claims 1 to 5 wherein said engine is provided with sufficient dead space volume in crank case and blow by passage to achieve the negative crankcase pressure with even firing order, without any control valve.
7 The novel twin cylinder turbocharged inter cooled internal combustion engine as claimed in claims 1 to 6 wherein exhaust conduits of both cylinder are combined before entering into turbine housing.
8 The novel twin cylinder naturally aspirated internal combustion engine comprises of crank train with its housing, combustion chambers, valve train and its housing, manifolds, and flywheel, wherein said combustion chambers are pre-combustion chamber and main combustion chamber, wherein pre-combustion chamber is provided in the cylinder head and main combustion chamber is provided in piston, intake and exhaust valves are actuated by direct acting overhead camshaft, intake and exhaust ports are provided on the same side of the cylinder head, intake and exhaust manifolds connect ports to intake and exhaust system respectively, fuel injectors are provided on opposite side of said ports, said cylinder head is provided with a provision of external oil return along with internal oil return to crankcase and internal blow by gas path.
9 Vehicle fitted with internal combustion engine as claimed in claims 1 to 8.
10 The novel twin cylinder turbocharged inter cooled internal combustion engine substantially as herein described with reference to accompanying drawings.

Documents:

2178-MUM-2007-ABSTRACT(12-8-2011).pdf

2178-MUM-2007-ABSTRACT(GRANTED)-(28-3-2012).pdf

2178-MUM-2007-CLAIMS(1-11-2007).pdf

2178-MUM-2007-CLAIMS(AMENDED)-(12-8-2011).pdf

2178-MUM-2007-CLAIMS(AMENDED)-(27-3-2012).pdf

2178-MUM-2007-CLAIMS(GRANTED)-(28-3-2012).pdf

2178-MUM-2007-CLAIMS(MARKED COPY)-(12-8-2011).pdf

2178-MUM-2007-CORRESPONDENCE(2-9-2011).pdf

2178-MUM-2007-CORRESPONDENCE(27-3-2012).pdf

2178-mum-2007-correspondence(28-11-2007).pdf

2178-MUM-2007-CORRESPONDENCE(IPO)-(29-3-2012).pdf

2178-mum-2007-correspondence-received.pdf

2178-mum-2007-description (complete).pdf

2178-MUM-2007-DESCRIPTION(COMPLETE)-(1-11-2007).pdf

2178-MUM-2007-DESCRIPTION(GRANTED)-(28-3-2012).pdf

2178-MUM-2007-DRAWING(1-11-2007).pdf

2178-MUM-2007-DRAWING(AMENDED)-(28-11-2007).pdf

2178-MUM-2007-DRAWING(GRANTED)-(28-3-2012).pdf

2178-mum-2007-drawings.pdf

2178-MUM-2007-FORM 1(1-11-2007).pdf

2178-MUM-2007-FORM 1(12-8-2011).pdf

2178-MUM-2007-FORM 1(2-9-2011).pdf

2178-mum-2007-form 18(28-11-2007).pdf

2178-MUM-2007-FORM 2(COMPLETE)-(1-11-2007).pdf

2178-MUM-2007-FORM 2(GRANTED)-(28-3-2012).pdf

2178-MUM-2007-FORM 2(TITLE PAGE)-(1-11-2007).pdf

2178-MUM-2007-FORM 2(TITLE PAGE)-(12-8-2011).pdf

2178-MUM-2007-FORM 2(TITLE PAGE)-(GRANTED)-(28-3-2012).pdf

2178-mum-2007-form 8(28-11-2007).pdf

2178-mum-2007-form 9(28-11-2007).pdf

2178-mum-2007-form-1.pdf

2178-mum-2007-form-2.doc

2178-mum-2007-form-2.pdf

2178-mum-2007-form-26.pdf

2178-mum-2007-form-3.pdf

2178-MUM-2007-GENERAL POWER OF ATTORNEY(12-8-2011).pdf

2178-MUM-2007-MARKED COPY(12-8-2011).pdf

2178-MUM-2007-PETITION UNDER RULE 137(12-8-2011).pdf

2178-MUM-2007-REPLY TO EXAMINATION REPORT(12-8-2011).pdf

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Patent Number

251691

Indian Patent Application Number

2178/MUM/2007

PG Journal Number

13/2012

Publication Date

30-Mar-2012

Grant Date

28-Mar-2012

Date of Filing

01-Nov-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	DATTATRAYA R KATKAR	BOMBAY HOUSE, 24 HOMI MODY STREET, HUTATMA CHOWK, MUMBAI - 400001.
2	RAJESH V BHANDARI	BOMBAY HOUSE, 24 HOMI MODY STREET, HUTATMA CHOWK, MUMBAI - 400001.

PCT International Classification Number

F02B29/07,F02D23/00

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA