Title of Invention	IC ENGINE COOLING SYSTEM WITH INTEGRATED THERMOSTAT AND COOLANT PUMP HOUSING
Abstract	This invention relates to IC engine cooling system with integrated thermostat and coolant pump housing said housing comprises provision for the inlet and outlet of coolant to various cooling circuits. In this housing, coolant from the radiator is circulated in the engine where heat is absorbed. Said housing is designed to accommodate two thermostats considering high coolant flow rates to reduce pressure drop. This also helps to minimize sudden cooling system failures due to failure in thermostat. In said system coolant flows through internal passages of the housing. The coolant enters through the passage connected to the cylinder block if the coolant temperature is less than the thermostat set temperature, the coolant flows through the passages to the coolant pump and back to the engine. If the coolant temperature is more than the thermostat set temperature the coolant flows to the radiator for cooling. The coolant returns to the said pump after cooling in the radiator. This also makes the cooling circuit more compact and robust. Fig.2

Title of Invention

IC ENGINE COOLING SYSTEM WITH INTEGRATED THERMOSTAT AND COOLANT PUMP HOUSING

Abstract

This invention relates to IC engine cooling system with integrated thermostat and coolant pump housing said housing comprises provision for the inlet and outlet of coolant to various cooling circuits. In this housing, coolant from the radiator is circulated in the engine where heat is absorbed. Said housing is designed to accommodate two thermostats considering high coolant flow rates to reduce pressure drop. This also helps to minimize sudden cooling system failures due to failure in thermostat. In said system coolant flows through internal passages of the housing. The coolant enters through the passage connected to the cylinder block if the coolant temperature is less than the thermostat set temperature, the coolant flows through the passages to the coolant pump and back to the engine. If the coolant temperature is more than the thermostat set temperature the coolant flows to the radiator for cooling. The coolant returns to the said pump after cooling in the radiator. This also makes the cooling circuit more compact and robust. Fig.2

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 IC Engine Cooling System With Integrated Thermostat And Coolant Pump housing 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. Saravanaraja T. and Mr. Mandar Ravindra Joshi 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 is related to Internal Combustion engines and more particularly this relates to engine cooling system with integrated thermostat housing and coolant pump. BACKGROUND OF INVENTION The IC engine is provided with a cooling system to dissipate the heat generated during combustion process to the atmosphere and also maintains the coolant at a certain temperature range for efficient engine operation. The demand for power torque combined with better fuel efficiency is increasing due to tougher emission norms and customer requirements. This causes increased heat generation, during the combustion process. It's a challenging task to achieve this performance without major increase in the size and weight of the internal combustion engine. Equally challenging task is to dissipate this heat energy in the available space. It is necessary to dissipate the heat as the materials of the engine parts can maintain its mechanical properties up to a certain temperature. Fig 1 shows schematic layout of the conventional cooling system with thermostat and coolant pump. The major components related to the cooling system are water pump, cylinder block, cylinder head, Radiator and thermostat. Thermostat (1) and water pump (3) are housed in different housings connected by hoses and pipes. The thermostat and its housing is placed on the hot side (engine to radiator) and the Water pump is placed on the cold side (radiator to engine) of the cooling system. The coolant from the engine comes to the thermostat. The coolant flows back to the engine or to the radiator depending on the coolant temperature. The coolant flows back to the engine through the by-pass (4). The coolant flows to the radiator (2) for heat dissipation if the coolant temperature exceeds the thermostat set temperature. The conventional cooling system comprises of Thermostat and thermostat housing (a): - Hot coolant from the cylinder head is collected in a passage and then sent to radiator via thermostat. Hence thermostat has to be located at the highest possible location and this is connected with hoses and pipes. This arrangement is in general, used for all liquid cooled internal combustion engines. The thermostat directs the flow to the radiator or back to the engine through by-pass (d) depending on the coolant temperature. If the temperature of the coolant circulating in the system is less than the thermostat set temperature then the thermostat directs the coolant flow to circulate in the engine through by-pass (d) to absorb the heat. If the coolant temperature is above the thermostat set temperature the thermostat directs the coolant to the radiator, which dissipates heat to the atmosphere. Radiator (b): - Rejects heat to the atmosphere by process of convection. Coolant pump (c): - Pumps the coolant from the radiator at required flow rate and pressure to the cylinder block to cool the cylinders. Then the coolant flows to cylinder head through various water passage connections between cylinder block and cylinder head. Basically coolant flows in the upward direction i.e., from cylinder block to cylinder head. The main drawback associated with this system is that the hose clamps and pipes, which are connected to the thermostat, are prone to leakages and damages over a period of time. The vehicle vibrations and the relative motion between engine and radiator can damage the connections leading to leakages. This also occupies more space. In some cases separate housing needs to be constructed to place the thermostat. Thermostat also has to be placed at the highest location, which is an important condition to be fulfilled. OBJECTS OF INVENTION The main object of this invention is to provide a cooling system with integrated thermostat and coolant pump housing, which contributes to a compact cooling system for internal combustion engines. Yet another object of this invention is to provide a cooling system with integrated thermostat and coolant pump housing for leak proof and robust design, which will last for the life of the engine. Yet another object of this invention is to provide a cooling system with integrated thermostat and water pump housing with a provision to locate the thermostat housing and coolant pump in line with the top down cooling system for this engine Yet another object of this invention is to provide cooling system with integrated thermostat and coolant pump housing with a provision to house one or more thermostats required for reducing the pressure drop due to higher coolant flow rates, which is a functional requirement of this engine. Yet another object of this invention is to provide cooling system with integrated thermostat housing and coolant pump with a compact housing for receiving the coolant through cooling circuits from EGR cooler, cabin heater and send the coolant to air compressor and connect to vent. Yet another object of this invention is to provide cooling system with integrated thermostat housing and coolant pump which is simple in construction and cost effective. SUMMARY OF INVENTION The present invention relates to an internal combustion engine cooling system disposed between an engine and a radiator of a vehicle, said internal combustion engine cooling system comprises a housing for thermostat and coolant pump, a thermostat section provided in said housing with at least one thermostat set at predetermined temperature to direct the coolant flow coming from said engine, either towards said radiator or back to said engine depending on the coolant temperature, said section is provided with a coolant inlet and an outlet adapted to be connected to said engine and to the radiator inlet respectively, said thermostat section being further with a by-pass passage, a coolant pump section provided at one end of said housing, said section has a coolant pump for pumping the coolant either from the radiator to the engine or from the by-pass passage connected to said coolant pump section to said engine, said coolant pump section section is provided with inlet adapted to be connected to the radiator outlet, and a coolant flow passage section provided in said housing and connected to said coolant pump section, said section is provided with a coolant outlet passage adapted to be connected to said engine. When the coolant temperature is less than the thermostat set temperature, the coolant coming from the engine is directed through the coolant inlet to the bypass passage for being pumped back to the engine by said coolant pump through thecoolant outlet passage. When the coolant temperature is more than thermostat set temperature, the coolant coming from the engine is directed through the coolant inlet to the radiator inlet where the coolant heat is dissipatedby the radiator to the atmosphere by convection, said coolant is then returned to the coolant pump section through the radiator outlet for being driven by the coolant pump back to the engine through the coolant outlet passage. According to the preferred embodiment, said thermostat and coolant pump are covered with thermostat cover and coolant cover respectively. According to the preferred embodiment, said housing is further provided with plurality of passages for radiator, cabin heater, air compressor, Exhaust Gas Recirculation cooler, vent and the engine. Preferably, said housing is provided with plurality of passages in the of coolant pump section for radiator, cabin heater and air compressor. Preferably, said housing is provided with plurality of passages in the thermostat section for Exhaust Gas Recirculation (EGR) cooler, radiator, vent and engine. According to the preferred embodiment, said housing is provided with two thermostats. Preferably, said thermostats are placed in the path of coolant flow and parallel to the coolant pump. Preferably, said bypass passage is provided above or below the coolant flow passage. According to another embodiment, said housing, thermostat cover and coolant pump cover are provided with strengthening ribs. BRIEF DESCRIPTION OF INVENTION Cooling system with integrated thermostat and coolant pump housing in accordance with this invention basically comprises of radiator with an inlet and an outlet, integrated thermostat and coolant pump housing, thermostat, and coolant passage through the cylinder head and cylinder block. Said housing is provided with plurality of passages towards pump end for radiator, cabin heater and air compressor and said housing is also provided with plurality of passages towards thermostat end for Exhaust Gas Recirculation (EGR)cooler, radiator, vent and engine. Said housing houses water pump and thermostat and is connected with engine and radiator. Said housing also provides a bypass passage and the coolant flow passage to and fro from the water pump to the engine. On starting the engine the coolant pump, pumps the coolant from the radiator to the engine, the coolant flows to the cylinder head, cylinder block and thermostat housing. The thermostat in the thermostat housing directs the coolant to the radiator or back to the engine depending on the coolant temperature. BRIEF DESCRIPTION OF DRAWINGS Fig 1 shows schematic layout of the conventional cooling system with thermostat and coolant pump. Fig 2 show the schematic layout of the cooling system with integrated thermostat and coolant Pump housing in accordance with this invention Fig 3 shows the integrated thermostat and coolant pump housing used in this invention Fig 4 shows sectional view of integrated thermostat and coolant pump housing with coolant flow path in bypass mode Fig 5 shows the sectional view of the integrated thermostat and coolant pump with coolant flow path to the radiator DESCRIPTION OF PREFERRED EMBODIMENTS Referring 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 2 shows schematic diagram, which illustrates various components of the cooling system with integrated thermostat housing and coolant pump in accordance with the invention. Coolant inlet (1), thermostat (2), water pump (4), integrated thermostat and coolant pump housing (5) coolant outlet (6), coolant flow to radiator (7), coolant flow from radiator (8), connection to vent (9), coolant flow from cabin heater (10), coolant flow to air compressor (11), coolant flow from EGR cooler (12). Referring to the figure 3, the coolant inlet (1) receives coolant from the engine and the coolant outlet (6) sends coolant to the engine. The housing has a port to receive coolant from EGR cooler (12), to send coolant to the air compressor (11), receive coolant from the cabin heater (10), and connection to the vent (9). The coolant is sent and received through coolant inlet (8) and coolant outlet (7) respectively to and fro from radiator. The coolant pump is covered with a rear cover (13) to house the coolant pump rotating parts. The thermostat is covered with thermostat cover (14), which also provides connection to the coolant outlet (7). The coolant from the engine is received from coolant inlet (1) is pumped by the water pump (4) into the passage of cast housing (5). This passage is connected to the coolant outlet passage (6) to engine for coolant circulation in the engine. The coolant absorbs the heat from various engine parts. This circulation is based on the top down cooling system where the coolant flows from the cylinder head to the cylinder block. The coolant returns to the water pump through the coolant inlet passage (1). Referring to figure 4, if the coolant temperature is less than the thermostat set temperature; the thermostat (2) directs the flow of coolant back to the engine through by-pass (3). Referring to figure 5, if the coolant temperature is more than the thermostat set temperature the thermostat (2) directs the coolant flow to the radiator inlet (7) where the heat is rejected by the radiator to the atmosphere by process of convection. The coolant returns from the radiator outlet (8) to the water pump (4) where it is pumped back to the engine. The integrated water pump and thermostat housing is also aligned to the Top Down cooling system. Since the coolant flows from Top to bottom i.e. from cylinder head to cylinder block, location of the thermostat is not a constraint. The thermostat can be located at a lesser height depending on availability of space and also integrated with coolant pump housing. The integrated thermostat and coolant pump housing has to be cast into a complex shape due its nature and functional requirement. The flow passages are designed for smooth flow of coolant to minimize the pressure drop. The coolant pump is designed in an in-volute shape for generating the coolant pressure. It does not require any special material and can be made in the existing available material i.e. aluminum. The said housing is strengthened with ribs at various locations. The integrated thermostat and coolant pump housing houses two thermostats to reduce pressure drop considering high coolant flow rate. One large thermostat would be difficult to design and manufacture, instead two smaller thermostats are easier to design and manufacture. Also since one large thermostat occupies more space, two thermostats are placed in parallel, which also occupies less space. Two smaller thermostats placed in parallel provide better reliability than one large thermostat since the cooling system is very critical for high power and torque. Any sudden failure of one thermostat cannot stop the functioning of the engine. The second thermostat can keep the cooling system functional at reduced efficiency and performance level. 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 those skilled in the art may practice numerous alterations and modifications 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. WE CLAIM 1. An internal combustion engine cooling system disposed between an engine and a radiator of a vehicle, said internal combustion engine cooling system comprising: - a housing (5) for thermostat (2) and coolant pump (4); - a thermostat section (a) provided in said housing (5) with at least one thermostat (2) set at predetermined temperature to direct the coolant flow coming from said engine, either towards said radiator or back to said engine depending on the coolant temperature, said section (a) is provided with a coolant inlet (1) and an outlet (7) adapted to be connected to said engine and to the radiator inlet respectively, said thermostat section (a) being further provided with a by-pass passage (3); - a coolant pump section (b) provided at one end of said housing (5), said section (b) has a coolant pump (4) for pumping the coolant either from the radiator to the engine or from the by-pass passage (3) connected to said coolant pump section (b) to said engine, said section (b) is provided with inlet (8) adapted to be connected to the radiator outlet; - a coolant flow passage section (c) provided in said housing (5) and connected to said coolant pump section (b), said section (c) is provided with a coolant outlet passage (6) adapted to be connected to said engine; - wherein when the coolant temperature is less than the thermostat set temperature, the coolant coming from the engine is directed through the coolant inlet (1) to the bypass passage (3) for being pumped back to the engine by said coolant pump (4) through the coolant outlet passage (6); and - wherein when the coolant temperature is more than thermostat set temperature, the coolant coming from the engine is directed through the coolant inlet (1) to the radiator inlet where the coolant heat is dissipated by the radiator to the atmosphere by convection, said coolant is then returned to the coolant pump section (b) through the radiator outlet for being driven by the coolant pump (4) back to the engine through the coolant outlet passage (6). 2. The internal combustion engine cooling system as claimed in claim 1, wherein said thermostat (2) and coolant pump (4) are covered with thermostat cover (14) and coolant rear cover (13) respectively. 3. The internal combustion engine cooling system as claimed in claims 1 and 2, wherein said housing (5) is further provided with plurality of passages for radiator, cabin heater, air compressor, Exhaust Gas Recirculation (EGR) cooler, vent and engine. 4. The internal combustion engine cooling system as claimed in claims 1 to 3, wherein said housing (5) is provided with plurality of passages in coolant pump section (b) for radiator, cabin heater and air compressor. 5. The internal combustion engine cooling system as claimed in claims 1 to 4, wherein said housing (5) is provided with plurality of passages in thermostat section for Exhaust Gas Recirculation (EGR) cooler, radiator, vent and engine. 6. The internal combustion engine cooling system as claimed in claims 1 to 5, wherein said housing (5) is provided with two thermostats (2). 7. The internal combustion engine cooling system as claimed in claims 1 to 6, wherein said thermostats (2) are placed parallel to the coolant pump (4). 8. The internal combustion engine cooling system as claimed in claims 1 to 7, wherein said thermostats (2) are placed in coolant flow path. 9. The internal combustion engine cooling system as claimed in claims 1 to 8 wherein said integrated housing and said covers are provided with strengthening ribs. 10. The internal combustion engine cooling system as claimed in claims 1 to 9 wherein said bypass passage (3) is provided above or below the coolant flow passage.

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
IC Engine Cooling System With Integrated Thermostat And Coolant Pump housing
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. Saravanaraja T. and Mr. Mandar Ravindra Joshi
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 is related to Internal Combustion engines and more particularly this relates to engine cooling system with integrated thermostat housing and coolant pump.
BACKGROUND OF INVENTION
The IC engine is provided with a cooling system to dissipate the heat generated during combustion process to the atmosphere and also maintains the coolant at a certain temperature range for efficient engine operation.
The demand for power torque combined with better fuel efficiency is increasing due to tougher emission norms and customer requirements. This causes increased heat generation, during the combustion process. It's a challenging task to achieve this performance without major increase in the size and weight of the internal combustion engine. Equally challenging task is to dissipate this heat energy in the available space. It is necessary to dissipate the heat as the materials of the engine parts can maintain its mechanical properties up to a certain temperature. Fig 1 shows schematic layout of the conventional cooling system with thermostat and coolant pump. The major components related to the cooling system are water pump, cylinder block, cylinder head, Radiator and thermostat.
Thermostat (1) and water pump (3) are housed in different housings connected by hoses and pipes. The thermostat and its housing is placed on the hot side (engine to radiator) and the Water pump is placed on the cold side (radiator to engine) of the cooling system. The coolant from the engine comes to the thermostat. The coolant flows back to the engine or to the radiator depending on the coolant temperature. The coolant flows back to the engine through the

by-pass (4). The coolant flows to the radiator (2) for heat dissipation if the coolant temperature exceeds the thermostat set temperature.
The conventional cooling system comprises of
Thermostat and thermostat housing (a): - Hot coolant from the cylinder head is collected in a passage and then sent to radiator via thermostat. Hence thermostat has to be located at the highest possible location and this is connected with hoses and pipes. This arrangement is in general, used for all liquid cooled internal combustion engines. The thermostat directs the flow to the radiator or back to the engine through by-pass (d) depending on the coolant temperature. If the temperature of the coolant circulating in the system is less than the thermostat set temperature then the thermostat directs the coolant flow to circulate in the engine through by-pass (d) to absorb the heat. If the coolant temperature is above the thermostat set temperature the thermostat directs the coolant to the radiator, which dissipates heat to the atmosphere. Radiator (b): - Rejects heat to the atmosphere by process of convection. Coolant pump (c): - Pumps the coolant from the radiator at required flow rate and pressure to the cylinder block to cool the cylinders. Then the coolant flows to cylinder head through various water passage connections between cylinder block and cylinder head. Basically coolant flows in the upward direction i.e., from cylinder block to cylinder head.
The main drawback associated with this system is that the hose clamps and pipes, which are connected to the thermostat, are prone to leakages and damages over a period of time. The vehicle vibrations and the relative motion between engine and radiator can damage the connections leading to leakages. This also occupies more space. In some cases separate housing needs to be constructed to place the thermostat. Thermostat also has to be placed at the highest location, which is an important condition to be fulfilled.

OBJECTS OF INVENTION
The main object of this invention is to provide a cooling system with integrated thermostat and coolant pump housing, which contributes to a compact cooling system for internal combustion engines.
Yet another object of this invention is to provide a cooling system with integrated thermostat and coolant pump housing for leak proof and robust design, which will last for the life of the engine.
Yet another object of this invention is to provide a cooling system with integrated thermostat and water pump housing with a provision to locate the thermostat housing and coolant pump in line with the top down cooling system for this engine
Yet another object of this invention is to provide cooling system with integrated thermostat and coolant pump housing with a provision to house one or more thermostats required for reducing the pressure drop due to higher coolant flow rates, which is a functional requirement of this engine.
Yet another object of this invention is to provide cooling system with integrated thermostat housing and coolant pump with a compact housing for receiving the coolant through cooling circuits from EGR cooler, cabin heater and send the coolant to air compressor and connect to vent.
Yet another object of this invention is to provide cooling system with integrated thermostat housing and coolant pump which is simple in construction and cost effective.

SUMMARY OF INVENTION
The present invention relates to an internal combustion engine cooling system disposed between an engine and a radiator of a vehicle, said internal combustion engine cooling system comprises a housing for thermostat and coolant pump, a thermostat section provided in said housing with at least one thermostat set at predetermined temperature to direct the coolant flow coming from said engine, either towards said radiator or back to said engine depending on the coolant temperature, said section is provided with a coolant inlet and an outlet adapted to be connected to said engine and to the radiator inlet respectively, said thermostat section being further with a by-pass passage, a coolant pump section provided at one end of said housing, said section has a coolant pump for pumping the coolant either from the radiator to the engine or from the by-pass passage connected to said coolant pump section to said engine, said coolant pump section section is provided with inlet adapted to be connected to the radiator outlet, and a coolant flow passage section provided in said housing and connected to said coolant pump section, said section is provided with a coolant outlet passage adapted to be connected to said engine. When the coolant temperature is less than the thermostat set temperature, the coolant coming from the engine is directed through the coolant inlet to the bypass passage for being pumped back to the engine by said coolant pump through thecoolant outlet passage. When the coolant temperature is more than thermostat set temperature, the coolant coming from the engine is directed through the coolant inlet to the radiator inlet where the coolant heat is dissipatedby the radiator to the atmosphere by convection, said coolant is then returned to the coolant pump section through the radiator outlet for being driven by the coolant pump back to the engine through the coolant outlet passage.
According to the preferred embodiment, said thermostat and coolant pump are covered with thermostat cover and coolant cover respectively.

According to the preferred embodiment, said housing is further provided with plurality of passages for radiator, cabin heater, air compressor, Exhaust Gas Recirculation cooler, vent and the engine.
Preferably, said housing is provided with plurality of passages in the of coolant pump section for radiator, cabin heater and air compressor.
Preferably, said housing is provided with plurality of passages in the thermostat section for Exhaust Gas Recirculation (EGR) cooler, radiator, vent and engine.
According to the preferred embodiment, said housing is provided with two
thermostats.
Preferably, said thermostats are placed in the path of coolant flow and parallel to the coolant pump.
Preferably, said bypass passage is provided above or below the coolant flow passage.
According to another embodiment, said housing, thermostat cover and coolant pump cover are provided with strengthening ribs.
BRIEF DESCRIPTION OF INVENTION
Cooling system with integrated thermostat and coolant pump housing in accordance with this invention basically comprises of radiator with an inlet and an outlet, integrated thermostat and coolant pump housing, thermostat, and coolant passage through the cylinder head and cylinder block. Said housing is provided with plurality of passages towards pump end for radiator, cabin heater and air compressor and said housing is also provided with plurality of passages

towards thermostat end for Exhaust Gas Recirculation (EGR)cooler, radiator, vent and engine. Said housing houses water pump and thermostat and is connected with engine and radiator. Said housing also provides a bypass passage and the coolant flow passage to and fro from the water pump to the engine.
On starting the engine the coolant pump, pumps the coolant from the radiator to the engine, the coolant flows to the cylinder head, cylinder block and thermostat housing. The thermostat in the thermostat housing directs the coolant to the radiator or back to the engine depending on the coolant temperature.
BRIEF DESCRIPTION OF DRAWINGS
Fig 1 shows schematic layout of the conventional cooling system with
thermostat and coolant pump.
Fig 2 show the schematic layout of the cooling system with integrated thermostat
and coolant Pump housing in accordance with this invention
Fig 3 shows the integrated thermostat and coolant pump housing used in this
invention
Fig 4 shows sectional view of integrated thermostat and coolant pump housing
with coolant flow path in bypass mode
Fig 5 shows the sectional view of the integrated thermostat and coolant pump
with coolant flow path to the radiator
DESCRIPTION OF PREFERRED EMBODIMENTS
Referring 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 2 shows schematic diagram, which illustrates various components of the cooling system with integrated thermostat housing and coolant pump in

accordance with the invention. Coolant inlet (1), thermostat (2), water pump (4), integrated thermostat and coolant pump housing (5) coolant outlet (6), coolant flow to radiator (7), coolant flow from radiator (8), connection to vent (9), coolant flow from cabin heater (10), coolant flow to air compressor (11), coolant flow from EGR cooler (12).
Referring to the figure 3, the coolant inlet (1) receives coolant from the engine and the coolant outlet (6) sends coolant to the engine. The housing has a port to receive coolant from EGR cooler (12), to send coolant to the air compressor (11), receive coolant from the cabin heater (10), and connection to the vent (9). The coolant is sent and received through coolant inlet (8) and coolant outlet (7) respectively to and fro from radiator. The coolant pump is covered with a rear cover (13) to house the coolant pump rotating parts. The thermostat is covered with thermostat cover (14), which also provides connection to the coolant outlet (7).
The coolant from the engine is received from coolant inlet (1) is pumped by the water pump (4) into the passage of cast housing (5). This passage is connected to the coolant outlet passage (6) to engine for coolant circulation in the engine. The coolant absorbs the heat from various engine parts. This circulation is based on the top down cooling system where the coolant flows from the cylinder head to the cylinder block. The coolant returns to the water pump through the coolant inlet passage (1).
Referring to figure 4, if the coolant temperature is less than the thermostat set temperature; the thermostat (2) directs the flow of coolant back to the engine through by-pass (3).
Referring to figure 5, if the coolant temperature is more than the thermostat set temperature the thermostat (2) directs the coolant flow to the radiator inlet (7)

where the heat is rejected by the radiator to the atmosphere by process of convection. The coolant returns from the radiator outlet (8) to the water pump (4) where it is pumped back to the engine.
The integrated water pump and thermostat housing is also aligned to the Top Down cooling system. Since the coolant flows from Top to bottom i.e. from cylinder head to cylinder block, location of the thermostat is not a constraint. The thermostat can be located at a lesser height depending on availability of space and also integrated with coolant pump housing.
The integrated thermostat and coolant pump housing has to be cast into a complex shape due its nature and functional requirement. The flow passages are designed for smooth flow of coolant to minimize the pressure drop. The coolant pump is designed in an in-volute shape for generating the coolant pressure. It does not require any special material and can be made in the existing available material i.e. aluminum. The said housing is strengthened with ribs at various locations.
The integrated thermostat and coolant pump housing houses two thermostats to reduce pressure drop considering high coolant flow rate. One large thermostat would be difficult to design and manufacture, instead two smaller thermostats are easier to design and manufacture. Also since one large thermostat occupies more space, two thermostats are placed in parallel, which also occupies less space.
Two smaller thermostats placed in parallel provide better reliability than one large thermostat since the cooling system is very critical for high power and torque. Any sudden failure of one thermostat cannot stop the functioning of the engine. The second thermostat can keep the cooling system functional at reduced efficiency and performance level.

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 those skilled in the art may practice numerous alterations and modifications 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.

WE CLAIM
1. An internal combustion engine cooling system disposed between an engine and a radiator of a vehicle, said internal combustion engine cooling system comprising:
- a housing (5) for thermostat (2) and coolant pump (4);
- a thermostat section (a) provided in said housing (5) with at least one thermostat (2) set at predetermined temperature to direct the coolant flow coming from said engine, either towards said radiator or back to said engine depending on the coolant temperature, said section (a) is provided with a coolant inlet (1) and an outlet (7) adapted to be connected to said engine and to the radiator inlet respectively, said thermostat section (a) being further provided with a by-pass passage (3);
- a coolant pump section (b) provided at one end of said housing (5), said section (b) has a coolant pump (4) for pumping the coolant either from the radiator to the engine or from the by-pass passage (3) connected to said coolant pump section (b) to said engine, said section (b) is provided with inlet (8) adapted to be connected to the radiator outlet;
- a coolant flow passage section (c) provided in said housing (5) and connected to said coolant pump section (b), said section (c) is provided with a coolant outlet passage (6) adapted to be connected to said engine;
- wherein when the coolant temperature is less than the thermostat set temperature, the coolant coming from the engine is directed through the coolant inlet (1) to the bypass passage (3) for being pumped back to the engine by said coolant pump (4) through the coolant outlet passage (6); and
- wherein when the coolant temperature is more than thermostat set temperature, the coolant coming from the engine is directed through the coolant inlet (1) to the radiator inlet where the coolant heat is dissipated by the radiator to the atmosphere by convection, said coolant is then

returned to the coolant pump section (b) through the radiator outlet for being driven by the coolant pump (4) back to the engine through the coolant outlet passage (6).
2. The internal combustion engine cooling system as claimed in claim 1, wherein said thermostat (2) and coolant pump (4) are covered with thermostat cover (14) and coolant rear cover (13) respectively.
3. The internal combustion engine cooling system as claimed in claims 1 and 2, wherein said housing (5) is further provided with plurality of passages for radiator, cabin heater, air compressor, Exhaust Gas Recirculation (EGR) cooler, vent and engine.
4. The internal combustion engine cooling system as claimed in claims 1 to
3, wherein said housing (5) is provided with plurality of passages in
coolant pump section (b) for radiator, cabin heater and air compressor.
5. The internal combustion engine cooling system as claimed in claims 1 to
4, wherein said housing (5) is provided with plurality of passages in
thermostat section for Exhaust Gas Recirculation (EGR) cooler, radiator,
vent and engine.
6. The internal combustion engine cooling system as claimed in claims 1 to
5, wherein said housing (5) is provided with two thermostats (2).
7. The internal combustion engine cooling system as claimed in claims 1 to
6, wherein said thermostats (2) are placed parallel to the coolant pump
(4).

8. The internal combustion engine cooling system as claimed in claims 1 to 7, wherein said thermostats (2) are placed in coolant flow path.
9. The internal combustion engine cooling system as claimed in claims 1 to
8 wherein said integrated housing and said covers are provided with
strengthening ribs.
10. The internal combustion engine cooling system as claimed in claims 1 to
9 wherein said bypass passage (3) is provided above or below the coolant
flow passage.

Documents:

2478-MUM-2007-ABSTRACT(10-10-2013).pdf

2478-MUM-2007-ABSTRACT(14-3-2012).pdf

2478-mum-2007-abstract.doc

2478-mum-2007-abstract.pdf

2478-MUM-2007-CANCELLED PAGES(14-3-2012).pdf

2478-MUM-2007-CLAIMS(AMENDED)-(10-10-2013).pdf

2478-MUM-2007-CLAIMS(AMENDED)-(14-3-2012).pdf

2478-mum-2007-claims.doc

2478-mum-2007-claims.pdf

2478-MUM-2007-CORRESPONDENCE(16-3-2012).pdf

2478-MUM-2007-CORRESPONDENCE(17-10-2013).pdf

2478-mum-2007-correspondence(19-2-2008).pdf

2478-MUM-2007-CORRESPONDENCE(3-10-2013).pdf

2478-mum-2007-correspondence-received.pdf

2478-mum-2007-description (complete).pdf

2478-MUM-2007-DRAWING(10-10-2013).pdf

2478-MUM-2007-DRAWING(14-3-2012).pdf

2478-MUM-2007-DRAWING(16-3-2012).pdf

2478-mum-2007-drawings.pdf

2478-MUM-2007-FORM 1(17-10-2013).pdf

2478-MUM-2007-FORM 13(10-10-2013).pdf

2478-MUM-2007-FORM 13(14-3-2012).pdf

2478-mum-2007-form 18(19-2-2008).pdf

2478-MUM-2007-FORM 2(TITLE PAGE)-(14-3-2012).pdf

2478-mum-2007-form 2(title page)-(18-12-2007).pdf

2478-MUM-2007-FORM 3(14-3-2012).pdf

2478-mum-2007-form 8(19-2-2008).pdf

2478-mum-2007-form 9(19-2-2008).pdf

2478-mum-2007-form-1.pdf

2478-mum-2007-form-2.doc

2478-mum-2007-form-2.pdf

2478-mum-2007-form-26.pdf

2478-mum-2007-form-3.pdf

2478-MUM-2007-GENERAL POWER OF ATTORNEY(14-3-2012).pdf

2478-mum-2007-general power of attorney(18-12-2007).pdf

2478-MUM-2007-MARKED COPY(10-10-2013).pdf

2478-MUM-2007-MARKED COPY(14-3-2012).pdf

2478-MUM-2007-REPLY TO EXAMINATION REPORT(14-3-2012).pdf

2478-MUM-2007-REPLY TO HEARING(10-10-2013).pdf

2478-MUM-2007-SPECIFICATION(AMENDED)-(10-10-2013).pdf

2478-MUM-2007-SPECIFICATION(AMENDED)-(14-3-2012).pdf

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Patent Number

257593

Indian Patent Application Number

2478/MUM/2007

PG Journal Number

43/2013

Publication Date

25-Oct-2013

Grant Date

18-Oct-2013

Date of Filing

18-Dec-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	SARAVANARAJA T.	BOMBAY HOUSE, 24 HOMI MODY STREET, HUTATMA CHOWK, MUMBAI-400 001.
2	MANDAR RAVINDRA JOSHI	BOMBAY HOUSE, 24 HOMI MODY STREET, HUTATMA CHOWK, MUMBAI-400 001.

PCT International Classification Number

F01P7/00,F01P3/00

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA