US20180179944A1 - Cooling system for internal combustion engine and thermostat device - Google Patents
Cooling system for internal combustion engine and thermostat device Download PDFInfo
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- US20180179944A1 US20180179944A1 US15/839,969 US201715839969A US2018179944A1 US 20180179944 A1 US20180179944 A1 US 20180179944A1 US 201715839969 A US201715839969 A US 201715839969A US 2018179944 A1 US2018179944 A1 US 2018179944A1
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- United States
- Prior art keywords
- coolant
- thermostat device
- water pump
- thermostatic element
- internal combustion
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/14—Controlling of coolant flow the coolant being liquid
- F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/14—Controlling of coolant flow the coolant being liquid
- F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
- F01P7/165—Controlling of coolant flow the coolant being liquid by thermostatic control characterised by systems with two or more loops
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P3/20—Cooling circuits not specific to a single part of engine or machine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/14—Controlling of coolant flow the coolant being liquid
- F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
- F01P7/164—Controlling of coolant flow the coolant being liquid by thermostatic control by varying pump speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/14—Controlling of coolant flow the coolant being liquid
- F01P2007/146—Controlling of coolant flow the coolant being liquid using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P2050/00—Applications
- F01P2050/22—Motor-cars
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P5/00—Pumping cooling-air or liquid coolants
- F01P5/10—Pumping liquid coolant; Arrangements of coolant pumps
- F01P5/12—Pump-driving arrangements
Definitions
- the disclosure relates to a cooling system for an internal combustion engine and a thermostat device.
- a valve of the thermostat device i.e., a valve that opens and closes a return passage from the radiator
- the coolant is circulated while bypassing the radiator, so as to achieve warm-up of the engine.
- the valve of the thermostat device After completion of warm-up of the engine, the valve of the thermostat device is opened, and the coolant flowing out from a water jacket of the engine is caused to flow through the radiator, so that the coolant releases heat collected from the engine, to the atmosphere, and suppresses overheating of the engine.
- This disclosure provide a cooling system for an internal combustion engine and a thermostat device, which is able to suppress overheating, while assuring early warm-up of the engine.
- An example aspect of the present disclosure is a cooling system for an internal combustion engine.
- the cooling system includes: a radiator connected with the internal combustion engine via a first outflow passage; a thermostat device connected with the radiator via a second outflow passage, connected with the internal combustion engine, the thermostat device being connected with the first outflow passage via a third outflow passage; an electric water pump configured to circulate a coolant.
- the thermostat device includes a first inflow port connected with the second outflow passage, a second inflow port connected with the third outflow passage, a valve controlling a flow rate of the coolant from the radiator, a thermostatic element that opens and closes the valve according to a temperature of the coolant, an outflow portion through which the coolant flows to the internal combustion engine, a guide portion that guides the coolant flowing through the second inflow port toward the thermostatic element, a slit flowing out the coolant from between the guide portion and the thermostatic element to the outflow portion.
- An example aspect of the present disclosure is a thermostat device for being provided in a cooling system that cools an internal combustion engine.
- the cooling system includes a radiator connected with the internal combustion engine via a first outflow passage, a thermostat device connected with the radiator via a second outflow passage, connected with the internal combustion engine, the thermostat device being connected with the first outflow passage via a third outflow passage, and an electric water pump configured to circulate a coolant.
- the thermostat device includes: a first inflow port connected with the second outflow passage; a second inflow port connected with the third outflow passage; a valve controlling a flow rate of the coolant from the radiator; a thermostatic element that opens and closes the valve according to a temperature of the coolant; an outflow portion through which the coolant flows to the internal combustion engine; a guide portion that guides the coolant flowing through the second inflow port toward the thermostatic element; a coil spring biasing the valve to close; and a frame supporting a lower end portion of the coil spring, having a slit that flows out the coolant from between the guide portion and the thermostatic element to the outflow portion.
- the flow rate of the coolant discharged from the electric water pump is reduced, and the momentum of the coolant current is reduced, so that the coolant flowing through the second inflow port can flow out through the slit, before reaching the thermostatic element.
- the warmed coolant is less likely or unlikely to hit or contact with the thermostatic element and open the valve; therefore, early warm-up can be achieved.
- the flow rate of the coolant discharged from the electric water pump is increased, and the momentum of the coolant current is increased, so that the guide portion enables the coolant flowing through the second inflow port to reach the thermostatic element, and the warmed coolant can be brought into contact with the thermostatic element.
- the valve can be opened with good response, after completion of warm-up, and overheating can be suppressed.
- the electric water pump may be provided such that the coolant from the outflow portion of the thermostat device flows into the electric water pump. Also, the thermostat device may be mounted on upper portion of the electric water pump.
- the thermostat device may include a coil spring that biases the valve to close, and a frame supports a lower end portion of the coil spring, and the slit may be provided on the frame.
- FIG. 1 is a view schematically showing the configuration of a cooling system according to one embodiment
- FIG. 2 is a cross-sectional view showing the internal structure of a thermostat device
- FIG. 3 is a bottom view of the thermostat device
- FIG. 4 is a view useful for explaining flow of coolant that flows into the thermostat device through a warm-up inflow port when the flow rate is high and when the flow rate is low.
- FIG. 1 schematically shows the configuration of a cooling system 1 according to the embodiment.
- the cooling system 1 includes a coolant circulation circuit 10 .
- the coolant circulation circuit 10 includes an electric water pump 2 for circulating coolant or cooling water, a radiator 3 that cools the circulating coolant, and a thermostat device 4 directly mounted on upper portion of the electric water pump 2 .
- the electric water pump 2 operates to circulate the coolant in the coolant circulation circuit 10 , so that an engine (internal combustion engine) 5 is cooled by the coolant.
- the engine 5 is a gasoline engine or a diesel engine, for example, and includes a cylinder head 51 and a cylinder block 52 .
- a head-side water jacket 51 a is formed inside the cylinder head 51
- a block-side water jacket 52 a is formed inside the cylinder block 52 .
- the head-side water jacket 51 a and the block-side water jacket 52 a communicate with each other.
- the cooling system 1 includes a pump discharge passage 11 , engine outflow passage 12 (first outflow passage), radiator return passage 13 (second outflow passage), and a warm-up return passage 14 (third outflow passage), as coolant passages that connect respective devices included in the coolant circulation circuit 10 .
- the pump discharge passage 11 connects a discharge port 21 of the electric water pump 2 with the block-side water jacket 52 a of the engine 5 .
- the engine outflow passage 12 connects the head-side water jacket 51 a of the engine 5 with an upper tank 31 of the radiator 3 .
- the radiator return passage 13 connects a lower tank 32 of the radiator 3 with a radiator-side inflow port 41 of the thermostat device 4 .
- the warm-up return passage 14 connects the engine outflow passage 12 with a warm-up inflow port 42 of the thermostat device 4 .
- the radiator-side inflow port 41 corresponds to the above-mentioned first inflow port (first inflow port into which the coolant flows from the radiator).
- the warm-up inflow port 42 corresponds to the above-mentioned second inflow port (second inflow port into which the coolant that bypasses the radiator flows).
- the electric water pump 2 generates water flow or water current for circulating the coolant in the coolant circulation circuit 10 .
- the electric water pump 2 has a motor (not shown) that operates with electric power from a battery (not shown), and the discharge flow rate (discharge quantity of flow per unit time) of the coolant can be varied by controlling the rotational speed of the motor. Namely, the rotational speed of the electric water pump 2 is controlled according to a pump rotational speed command signal from an ECU 100 , so that the discharge flow rate is controlled.
- the ECU 100 controls the rotational speed of the electric water pump 2 , by generating the pump rotational speed command signal according to the temperature of the coolant circulating in the coolant circulation circuit 10 . The control of the rotational speed of the electric water pump 2 will be described later.
- the radiator 3 is of a down-flow type, for example, and includes a radiator core 33 disposed between the upper tank 31 and the lower tank 32 .
- the radiator 3 performs heat exchange between the coolant and the outside air, so as to release heat of the coolant to the atmosphere.
- the thermostat device 4 has a housing 43 formed of synthetic resin, and a thermostatic element unit 44 mounted in the center of the interior of the housing 43 .
- the radiator-side inflow port 41 is formed in a side face (back side face in FIG. 2 ) in the vicinity of an upper end portion of the housing 43 , and a radiator return pipe 13 A that forms the radiator return passage 13 is connected to the radiator-side inflow port 41 .
- an outflow portion 45 is provided in a lower end portion of the housing 43 .
- the outflow portion 45 permits the coolant that has flowed through the interior of the thermostat device 4 to flow out toward the electric water pump 2 .
- An opening 45 a through which the coolant flows out is formed in the middle of the outflow portion 45 .
- Flanges 45 b , 45 b connected to an upper end portion of the electric water pump 2 are formed on the radially outer side of the opening 45 a .
- the flanges 45 b , 45 b are provided with bolt insertion holes 45 c, 45 c.
- the upper end portion of the electric water pump 2 is superimposed on the lower sides of the flanges 45 b , 45 b , and these members 2 , 45 b are integrally assembled by bolt fastening.
- the opening 45 a of the outflow portion 45 of the thermostat device 4 is communicated with an admission port of the electric water pump 2 , and the coolant that has flowed through the thermostat device 4 is adapted to flow into the electric water pump 2 via the opening 45 a.
- the coolant passes through the radiator return passage 13 and flows from the radiator-side inflow port 41 into the thermostat device 4 , the coolant flows from the upper side toward the lower side within the thermostat device 4 , and flows out from the opening 45 a of the outflow portion 45 , toward the electric water pump 2 .
- the warm-up inflow port 42 is formed in a side face (a left side face in FIG. 2 ) in the vicinity of a lower end portion of the housing 43 , and a warm-up return pipe 14 A that forms the warm-up return passage 14 is connected to the warm-up inflow port 42 .
- the coolant that has passed through the warm-up return passage 14 and entered the thermostat device 4 from the warm-up inflow port 42 flows in a lower portion of the interior of the thermostat device 4 , and flows out from the opening 45 a of the outflow portion 45 , into the electric water pump 2 .
- the thermostatic element unit 44 includes a thermostatic element 44 a that incorporates a thermal expansion body (thermo-wax) that expands and contracts in response to the temperature of the coolant, and a piston 44 b that is advanced (or moves upward relative to the thermostatic element 44 a ) due to expansion of the thermal expansion body.
- An upper end portion of the piston 44 b is fixed to a piston support portion 43 a formed by projecting an inner wall of an upper part of the housing 43 . Therefore, as the piston 44 b is advanced, the thermostatic element 44 a moves downward.
- a disc-like valve 44 c is attached to the thermostatic element 44 a .
- the valve 44 c is placed in a closed state when it comes into contact with a valve seat 43 b formed by reducing the diameter of the inner wall of the housing 43 .
- the valve 44 c is provided for controlling the flow rate of the coolant from the radiator 3 .
- the thermostatic element unit 44 also includes a coil spring 44 d that biases the valve 44 c in a valve-closing direction.
- An upper end portion of the coil spring 44 d is in abutting contact with a lower surface of the valve 44 c .
- a lower end portion of the coil spring 44 d is supported by a spring receiving frame 6 provided in the outflow portion 45 .
- the coil spring 44 d is mounted in place such that it is compressed between the valve 44 c and the spring receiving frame 6 , so as to apply bias force to the valve 44 c in the valve-closing direction (upward direction).
- the spring receiving frame 6 has engaging pieces 61 , 61 formed in its outer peripheral portion, at two positions having a phase difference of 180° in the circumferential direction.
- the engaging pieces 61 , 61 are shaped to protrude radially outward, and are supported by support protrusions 43 c , 43 c formed on the inner circumferential surface of the housing 43 such that the engaging pieces 61 , 61 are inhibited from rotating.
- One of the engaging pieces 61 is located on the side (left-hand side in FIG. 3 ) where the warm-up return pipe 14 A is mounted, and the other engaging piece 61 is located on the side (right-hand side in FIG. 3 ) opposite to the side where the warm-up return pipe 14 A is mounted.
- thermostatic element unit 44 is incorporated in the housing 43 , such that the upper end portion of the piston 44 b is fixed to the piston support portion 43 a, and lower end portions of the coil spring 44 d and the thermostatic element 44 a are supported by the spring receiving frame 6 .
- the outside diameter of its portions other than those where the engaging pieces 61 , 61 are formed is set to be smaller than the inside diameter of the opening 45 a . Therefore, spaces S, S that extend in the circumferential direction are formed between the inner edge of the opening 45 a and the outer edge of the spring receiving frame 6 . Also, slits 62 , 62 that extend through the spring receiving frame 6 in its thickness direction are formed in the engaging pieces 61 , 61 of the spring receiving frame 6 . The slits 62 , 62 are formed in the shape of long holes to extend in the circumferential direction. Therefore, in the outflow portion 45 , the spaces S, S and the slits 62 , 62 are formed as coolant flow passages that communicate the interior of the thermostat device 4 with the electric water pump 2 .
- the ECU 100 outputs the pump rotational speed command signal according to the temperature of the coolant, and controls the rotational speed of the electric water pump 2 .
- a water temperature sensor 101 that detects the temperature of the coolant and a pump rotational speed sensor 102 that detects the rotational speed of the electric water pump 2 , for example, are connected to the ECU 100 , and the ECU 100 receives output signals from the respective sensors 101 , 102 .
- the water temperature sensor 101 is mounted on the outlet side of the thermostat device 4 , for example. However, the mounting position of the water temperature sensor 101 is not limited to this position.
- the pump rotational speed sensor 102 is mounted in the electric water pump 2 .
- the rotational speed of the electric water pump 2 is set low, and the discharge flow rate is reduced, during warm-up operation of the engine 5 .
- the rotational speed of the electric water pump 2 is set high, and the discharge flow rate is increased. Namely, during warm-up, the discharge flow rate of the electric water pump 2 is made lower than that after completion of warm-up. After completion of warm-up, the discharge flow rate of the electric water pump 2 is made higher than that during warm-up.
- the warm-up inflow port 42 is in the form of an opening that is open in the horizontal direction (to the left in FIG. 2 ).
- the warm-up return pipe 14 A extends along the vertical direction at one side of the thermostat device 4 , and its lower-end position is set to the vicinity of a lower-end position of a side face of the thermostat device 4 .
- the warm-up inflow port 42 is formed in a portion of the housing 43 with which a side face of the warm-up return pipe 14 A contacts. Therefore, the direction of the flow line of the coolant that flows through the warm-up return passage 14 within the warm-up return pipe 14 A changes from the downward direction in FIG. 2 to the rightward direction (toward the interior of the thermostat device 4 ), in a downstream end portion of the warm-up return passage 14 .
- the warm-up return pipe 14 A has a guide function of guiding the coolant that has flowed through the warm-up return passage 14 , toward the thermostatic element 44 a.
- a portion of an inner wall surface of a lower end portion of the warm-up return pipe 14 A which is located remote from the thermostat device 4 (or located on the left-hand side in FIG. 2 ), is formed as an inclined surface 14 a that is inclined downward toward the thermostat device 4 .
- a bottom 14 c of the warm-up return pipe 14 A has a horizontal surface 14 b that extends in the horizontal direction from a lower edge of the inclined surface 14 a , and includes a guide portion 14 d as another guide function that extends toward the interior of the thermostat device 4 .
- the horizontal dimension of the guide portion 14 d i.e., a dimension by which the guide portion 14 d protrudes toward the interior of the thermostat device 4 ) is set by experiment or simulation, so that, when the discharge flow rate of the electric water pump 2 is set high, the coolant that has flowed through the warm-up return passage 14 can reach the thermostatic element 44 a.
- the corresponding slit 62 formed in this engaging piece 61 is also located on the side where the warm-up return pipe 14 A is mounted.
- the slit 62 is located between the guide portion 14 d and the thermostatic element 44 a , and is located below the warm-up inflow port 42 .
- the dimensions and location of the slit 62 are set by experiment or simulation, so that, when the discharge flow rate of the electric water pump 2 is set low, the coolant that has flowed through the warm-up return passage 14 can be discharged from the slit 62 , before reaching the thermostatic element 44 a.
- the temperature of the coolant is low at the time of cold start of the engine 5 ; therefore, the thermal expansion body of the thermostatic element 44 a contracts, and the valve 44 c of the thermostat device 4 is closed.
- the electric water pump 2 is operated, so that the coolant is circulated successively through the electric water pump 2 , pump discharge passage 11 , block-side water jacket 52 a , head-side water jacket 51 a , engine outflow passage 12 , warm-up return passage 14 , thermostat device 4 , and the electric water pump 2 , in the order of description.
- the rotational speed of the electric water pump 2 is set low, so that the discharge flow rate is reduced, as described above.
- the momentum of the coolant current is reduced, so that the coolant that flows in through the warm-up inflow port 42 of the thermostat device 4 flows out through the slit 62 before reaching the thermostatic element 44 a , as indicated by outlined arrow LF in FIG. 4 .
- the coolant from the warm-up inflow port 42 flows down or drops from a distal end of the guide portion 14 d , and is directed toward the slit 62 .
- the outflow portion 45 of the thermostat device 4 is connected with the admission port of the electric water pump 2 , the outflow of the coolant from the slit 62 is promoted, due to a negative pressure of the electric water pump 2 . Accordingly, the coolant warmed by the engine 5 is less likely or unlikely to hit or contact with the thermostatic element 44 a , and the valve 44 c can be made less likely or unlikely to be unnecessarily opened.
- the rotational speed of the electric water pump 2 is set high, and the discharge flow rate is increased, as described above, as control of the electric water pump 2 after completion of warm-up.
- the flow rate is high, the momentum of the coolant current is increased, so that the coolant flowing from the warm-up inflow port 42 of the thermostat device 4 is guided by the guide portion 14 d , and reaches the thermostatic element 44 a , as indicated by outlined arrow HF of FIG. 4 .
- the coolant warmed by the engine 5 can be brought into contact with the thermostatic element 44 a , so that the valve 44 c can be opened with good response.
- circulation of the coolant indicated by arrows of one-dot chain lines in FIG. 1 is performed, in addition to circulation of the coolant indicated by arrows of solid lines in FIG. 1 .
- the coolant is also circulated successively through the electric water pump 2 , pump discharge passage 11 , block-side water jacket 52 a , head-side water jacket 51 a , engine outflow passage 12 , radiator 3 , radiator return passage 13 , thermostat device 4 , and the electric water pump 2 , in the order of description. Therefore, the coolant that has flowed through the warm-up return passage 14 and the coolant that has flowed through the radiator return passage 13 both flow into the thermostat device 4 . Then, a part of the coolant flows through the radiator 3 , and heat of the coolant is released to the atmosphere.
- the cooling system includes the guide portion 14 d that guides the coolant flowing from the warm-up inflow port 42 toward the thermostatic element 44 a , and the slit 62 provided in the outflow portion 45 and located between the guide portion 14 d and the thermostatic element 44 a , as described above.
- the coolant that has been warmed is less likely or unlikely to hit or contact with the thermostatic element 44 a and open the valve 44 c , so that early warm-up can be achieved. Accordingly, the fuel consumption rate can be improved.
- the discharge flow rate of the electric water pump 2 is increased, and the momentum of the coolant current is increased, so that the coolant flowing from the warm-up inflow port 42 can reach the thermostatic element 44 a via the guide portion 14 d .
- the warmed coolant can be brought into contact with the thermostatic element 44 a .
- the valve 44 c can be opened with good response, after completion of warn-up, so that overheating can be suppressed. Consequently, it is possible to suppress overheating, while assuring early warm-up.
- the coolant flows into the electric water pump 2 from the outflow portion 45 of the thermostat device 4 ; therefore, outflow of the coolant through the slit 62 is promoted due to a negative pressure of the electric water pump 22 , and the coolant warmed during warm-up can be made less likely or unlikely to hit or contact with the thermostatic element 44 a.
- the disclosure is applied to the cooling system for the engine for the automobile in the illustrated embodiment, the disclosure may be applied to cooling systems other than those of engines for automobiles.
- a heater core may be provided in the coolant circulation circuit 10 .
- This disclosure may be used in a cooling system for an internal combustion engine including a thermostat device that switches flow of coolant of the engine which is circulated by an electric water pump.
Abstract
Description
- The disclosure of Japanese Patent Application No. 2016-250944 filed on Dec. 26, 2016 including the specification, drawings and abstract is incorporated herein by reference in its entirety.
- The disclosure relates to a cooling system for an internal combustion engine and a thermostat device.
- A cooling system of an engine (internal combustion engine) described in Japanese Patent Application Publication No. 2009-52506 (JP 2009-52506 A), for example, includes a coolant circulation circuit having a water pump, radiator, thermostat device, and so forth. At the time of cold start of the engine, a valve of the thermostat device (i.e., a valve that opens and closes a return passage from the radiator) is closed, so as to stop flow of the coolant through the radiator. Namely, the coolant is circulated while bypassing the radiator, so as to achieve warm-up of the engine. After completion of warm-up of the engine, the valve of the thermostat device is opened, and the coolant flowing out from a water jacket of the engine is caused to flow through the radiator, so that the coolant releases heat collected from the engine, to the atmosphere, and suppresses overheating of the engine.
- While it is desired to warm up the engine early after cold start of the engine, in order to improve the fuel consumption rate, it is necessary to suppress overheating after completion of warm-up.
- This disclosure provide a cooling system for an internal combustion engine and a thermostat device, which is able to suppress overheating, while assuring early warm-up of the engine.
- An example aspect of the present disclosure is a cooling system for an internal combustion engine. The cooling system includes: a radiator connected with the internal combustion engine via a first outflow passage; a thermostat device connected with the radiator via a second outflow passage, connected with the internal combustion engine, the thermostat device being connected with the first outflow passage via a third outflow passage; an electric water pump configured to circulate a coolant. The thermostat device includes a first inflow port connected with the second outflow passage, a second inflow port connected with the third outflow passage, a valve controlling a flow rate of the coolant from the radiator, a thermostatic element that opens and closes the valve according to a temperature of the coolant, an outflow portion through which the coolant flows to the internal combustion engine, a guide portion that guides the coolant flowing through the second inflow port toward the thermostatic element, a slit flowing out the coolant from between the guide portion and the thermostatic element to the outflow portion. An example aspect of the present disclosure is a thermostat device for being provided in a cooling system that cools an internal combustion engine. The cooling system includes a radiator connected with the internal combustion engine via a first outflow passage, a thermostat device connected with the radiator via a second outflow passage, connected with the internal combustion engine, the thermostat device being connected with the first outflow passage via a third outflow passage, and an electric water pump configured to circulate a coolant. The thermostat device includes: a first inflow port connected with the second outflow passage; a second inflow port connected with the third outflow passage; a valve controlling a flow rate of the coolant from the radiator; a thermostatic element that opens and closes the valve according to a temperature of the coolant; an outflow portion through which the coolant flows to the internal combustion engine; a guide portion that guides the coolant flowing through the second inflow port toward the thermostatic element; a coil spring biasing the valve to close; and a frame supporting a lower end portion of the coil spring, having a slit that flows out the coolant from between the guide portion and the thermostatic element to the outflow portion.
- With the above arrangement, during warm-up of the engine, the flow rate of the coolant discharged from the electric water pump is reduced, and the momentum of the coolant current is reduced, so that the coolant flowing through the second inflow port can flow out through the slit, before reaching the thermostatic element. Thus, during warm-up, the warmed coolant is less likely or unlikely to hit or contact with the thermostatic element and open the valve; therefore, early warm-up can be achieved.
- After completion of warm-up, the flow rate of the coolant discharged from the electric water pump is increased, and the momentum of the coolant current is increased, so that the guide portion enables the coolant flowing through the second inflow port to reach the thermostatic element, and the warmed coolant can be brought into contact with the thermostatic element. As a result, the valve can be opened with good response, after completion of warm-up, and overheating can be suppressed.
- The electric water pump may be provided such that the coolant from the outflow portion of the thermostat device flows into the electric water pump. Also, the thermostat device may be mounted on upper portion of the electric water pump.
- With the above arrangement, outflow of the coolant from the slit is promoted due to a negative pressure of the electric water pump, so that the coolant warmed during warm-up can be made less likely or unlikely to hit or contact with the thermostatic element.
- The thermostat device may include a coil spring that biases the valve to close, and a frame supports a lower end portion of the coil spring, and the slit may be provided on the frame.
- With the cooling system for the internal combustion engine according to the disclosure, it is possible to suppress overheating while assuring early warm-up.
- Features, advantages, and technical and industrial significance of exemplary embodiments of the disclosure will be described below with reference to the accompanying drawings, in which like numerals denote like elements, and wherein:
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FIG. 1 is a view schematically showing the configuration of a cooling system according to one embodiment; -
FIG. 2 is a cross-sectional view showing the internal structure of a thermostat device; -
FIG. 3 is a bottom view of the thermostat device; and -
FIG. 4 is a view useful for explaining flow of coolant that flows into the thermostat device through a warm-up inflow port when the flow rate is high and when the flow rate is low. - One embodiment of the disclosure will be described based on the drawings. In this embodiment, the disclosure is applied to a cooling system for an engine for an automobile.
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FIG. 1 schematically shows the configuration of acooling system 1 according to the embodiment. As shown inFIG. 1 , thecooling system 1 includes acoolant circulation circuit 10. Thecoolant circulation circuit 10 includes anelectric water pump 2 for circulating coolant or cooling water, aradiator 3 that cools the circulating coolant, and athermostat device 4 directly mounted on upper portion of theelectric water pump 2. Theelectric water pump 2 operates to circulate the coolant in thecoolant circulation circuit 10, so that an engine (internal combustion engine) 5 is cooled by the coolant. - The
engine 5 is a gasoline engine or a diesel engine, for example, and includes acylinder head 51 and acylinder block 52. A head-side water jacket 51 a is formed inside thecylinder head 51, and a block-side water jacket 52 a is formed inside thecylinder block 52. In theengine 5 of this embodiment, the head-side water jacket 51 a and the block-side water jacket 52 a communicate with each other. - The
cooling system 1 includes apump discharge passage 11, engine outflow passage 12 (first outflow passage), radiator return passage 13 (second outflow passage), and a warm-up return passage 14 (third outflow passage), as coolant passages that connect respective devices included in thecoolant circulation circuit 10. - The
pump discharge passage 11 connects adischarge port 21 of theelectric water pump 2 with the block-side water jacket 52 a of theengine 5. Theengine outflow passage 12 connects the head-side water jacket 51 a of theengine 5 with anupper tank 31 of theradiator 3. Theradiator return passage 13 connects alower tank 32 of theradiator 3 with a radiator-side inflow port 41 of thethermostat device 4. The warm-up return passage 14 connects theengine outflow passage 12 with a warm-up inflow port 42 of thethermostat device 4. The radiator-side inflow port 41 corresponds to the above-mentioned first inflow port (first inflow port into which the coolant flows from the radiator). Also, the warm-up inflow port 42 corresponds to the above-mentioned second inflow port (second inflow port into which the coolant that bypasses the radiator flows). - The
electric water pump 2 generates water flow or water current for circulating the coolant in thecoolant circulation circuit 10. Theelectric water pump 2 has a motor (not shown) that operates with electric power from a battery (not shown), and the discharge flow rate (discharge quantity of flow per unit time) of the coolant can be varied by controlling the rotational speed of the motor. Namely, the rotational speed of theelectric water pump 2 is controlled according to a pump rotational speed command signal from anECU 100, so that the discharge flow rate is controlled. The ECU 100 controls the rotational speed of theelectric water pump 2, by generating the pump rotational speed command signal according to the temperature of the coolant circulating in thecoolant circulation circuit 10. The control of the rotational speed of theelectric water pump 2 will be described later. - The
radiator 3 is of a down-flow type, for example, and includes aradiator core 33 disposed between theupper tank 31 and thelower tank 32. When the coolant collected by theupper tank 31 flows down within theradiator core 33, toward thelower tank 32, theradiator 3 performs heat exchange between the coolant and the outside air, so as to release heat of the coolant to the atmosphere. - As shown in
FIG. 2 (cross-sectional view showing the internal structure of the thermostat device 4), thethermostat device 4 has ahousing 43 formed of synthetic resin, and athermostatic element unit 44 mounted in the center of the interior of thehousing 43. - The radiator-
side inflow port 41 is formed in a side face (back side face inFIG. 2 ) in the vicinity of an upper end portion of thehousing 43, and aradiator return pipe 13A that forms theradiator return passage 13 is connected to the radiator-side inflow port 41. - As shown in
FIG. 3 (a bottom view of the thermostat device 4), anoutflow portion 45 is provided in a lower end portion of thehousing 43. Theoutflow portion 45 permits the coolant that has flowed through the interior of thethermostat device 4 to flow out toward theelectric water pump 2. Anopening 45 a through which the coolant flows out is formed in the middle of theoutflow portion 45.Flanges electric water pump 2 are formed on the radially outer side of the opening 45 a. Theflanges bolt insertion holes electric water pump 2 is superimposed on the lower sides of theflanges members outflow portion 45 of thethermostat device 4 is communicated with an admission port of theelectric water pump 2, and the coolant that has flowed through thethermostat device 4 is adapted to flow into theelectric water pump 2 via theopening 45 a. - Therefore, when the coolant passes through the
radiator return passage 13 and flows from the radiator-side inflow port 41 into thethermostat device 4, the coolant flows from the upper side toward the lower side within thethermostat device 4, and flows out from the opening 45 a of theoutflow portion 45, toward theelectric water pump 2. - The warm-
up inflow port 42 is formed in a side face (a left side face inFIG. 2 ) in the vicinity of a lower end portion of thehousing 43, and a warm-up return pipe 14A that forms the warm-up return passage 14 is connected to the warm-up inflow port 42. - Therefore, the coolant that has passed through the warm-
up return passage 14 and entered thethermostat device 4 from the warm-up inflow port 42 flows in a lower portion of the interior of thethermostat device 4, and flows out from the opening 45 a of theoutflow portion 45, into theelectric water pump 2. - The
thermostatic element unit 44 includes athermostatic element 44 a that incorporates a thermal expansion body (thermo-wax) that expands and contracts in response to the temperature of the coolant, and apiston 44 b that is advanced (or moves upward relative to thethermostatic element 44 a) due to expansion of the thermal expansion body. An upper end portion of thepiston 44 b is fixed to apiston support portion 43a formed by projecting an inner wall of an upper part of thehousing 43. Therefore, as thepiston 44 b is advanced, thethermostatic element 44 a moves downward. - A disc-
like valve 44 c is attached to thethermostatic element 44 a. Thevalve 44 c is placed in a closed state when it comes into contact with avalve seat 43 b formed by reducing the diameter of the inner wall of thehousing 43. Thevalve 44 c is provided for controlling the flow rate of the coolant from theradiator 3. - The
thermostatic element unit 44 also includes acoil spring 44 d that biases thevalve 44 c in a valve-closing direction. An upper end portion of thecoil spring 44 d is in abutting contact with a lower surface of thevalve 44 c. Also, a lower end portion of thecoil spring 44 d is supported by aspring receiving frame 6 provided in theoutflow portion 45. Thecoil spring 44 d is mounted in place such that it is compressed between thevalve 44 c and thespring receiving frame 6, so as to apply bias force to thevalve 44 c in the valve-closing direction (upward direction). - As shown in
FIG. 3 , thespring receiving frame 6 has engagingpieces pieces support protrusions housing 43 such that the engagingpieces pieces 61 is located on the side (left-hand side inFIG. 3 ) where the warm-up return pipe 14A is mounted, and the other engagingpiece 61 is located on the side (right-hand side inFIG. 3 ) opposite to the side where the warm-up return pipe 14A is mounted. - A lower end portion of the
thermostatic element 44 a is inserted into anopening 63 formed in the center of thespring receiving frame 6. Therefore, thethermostatic element unit 44 is incorporated in thehousing 43, such that the upper end portion of thepiston 44 b is fixed to thepiston support portion 43 a, and lower end portions of thecoil spring 44 d and thethermostatic element 44 a are supported by thespring receiving frame 6. - In the
spring receiving frame 6, the outside diameter of its portions other than those where the engagingpieces spring receiving frame 6. Also, slits 62, 62 that extend through thespring receiving frame 6 in its thickness direction are formed in the engagingpieces spring receiving frame 6. Theslits outflow portion 45, the spaces S, S and theslits thermostat device 4 with theelectric water pump 2. - With the
thermostat device 4 constructed as described above, when the temperature of the coolant flowing into thethermostat device 4 is low, the thermal expansion body incorporated in thethermostatic element 44 a is contracted, and thepiston 44 b is retracted (i.e., moves downward relative to thethermostatic element 44 a). As a result, thevalve 44 c attached to thethermostatic element 44 a moves relatively upward, and abuts against thevalve seat 43 b, so as to be closed under the bias force of thecoil spring 44 d. With thevalve 44 c thus placed in the closed state, inflow of the coolant from theradiator return passage 13 is shut off. On the other hand, if the temperature of the coolant flowing into thethermostat device 4 rises, the thermal expansion body incorporated in thethermostatic element 44 a expands, and thepiston 44 b is advanced (i.e., moves upward relative to thethermostatic element 44 a). As a result, thevalve 44 c attached to thethermostatic element 44 a moves relatively downward, against the bias force of thecoil spring 44 d, to be spaced apart from thevalve seat 43 b, so that thevalve 44 c is opened. With thevalve 44 c thus placed in the open state, inflow of the coolant from theradiator return passage 13 is permitted. - As described above, the
ECU 100 outputs the pump rotational speed command signal according to the temperature of the coolant, and controls the rotational speed of theelectric water pump 2. - A
water temperature sensor 101 that detects the temperature of the coolant and a pumprotational speed sensor 102 that detects the rotational speed of theelectric water pump 2, for example, are connected to theECU 100, and theECU 100 receives output signals from therespective sensors water temperature sensor 101 is mounted on the outlet side of thethermostat device 4, for example. However, the mounting position of thewater temperature sensor 101 is not limited to this position. The pumprotational speed sensor 102 is mounted in theelectric water pump 2. - As one example of rotational speed control of the
electric water pump 2, the rotational speed of theelectric water pump 2 is set low, and the discharge flow rate is reduced, during warm-up operation of theengine 5. On the other hand, after completion of warm-up of theengine 5, the rotational speed of theelectric water pump 2 is set high, and the discharge flow rate is increased. Namely, during warm-up, the discharge flow rate of theelectric water pump 2 is made lower than that after completion of warm-up. After completion of warm-up, the discharge flow rate of theelectric water pump 2 is made higher than that during warm-up. - Some characteristic arrangements of this embodiment will be described.
- As shown in
FIG. 2 , the warm-up inflow port 42 is in the form of an opening that is open in the horizontal direction (to the left inFIG. 2 ). The warm-up return pipe 14A extends along the vertical direction at one side of thethermostat device 4, and its lower-end position is set to the vicinity of a lower-end position of a side face of thethermostat device 4. Then, the warm-up inflow port 42 is formed in a portion of thehousing 43 with which a side face of the warm-up return pipe 14A contacts. Therefore, the direction of the flow line of the coolant that flows through the warm-up return passage 14 within the warm-up return pipe 14A changes from the downward direction inFIG. 2 to the rightward direction (toward the interior of the thermostat device 4), in a downstream end portion of the warm-up return passage 14. - The warm-
up return pipe 14A has a guide function of guiding the coolant that has flowed through the warm-up return passage 14, toward thethermostatic element 44 a. - More specifically, a portion of an inner wall surface of a lower end portion of the warm-
up return pipe 14A, which is located remote from the thermostat device 4 (or located on the left-hand side inFIG. 2 ), is formed as aninclined surface 14 a that is inclined downward toward thethermostat device 4. With this arrangement, it is possible to change the direction of the flow line of the coolant as described above from the downward direction to a direction toward the interior of thethermostat device 4, while curbing reduction of the flow speed. - Also, a bottom 14 c of the warm-
up return pipe 14A has ahorizontal surface 14 b that extends in the horizontal direction from a lower edge of theinclined surface 14 a, and includes aguide portion 14 d as another guide function that extends toward the interior of thethermostat device 4. The horizontal dimension of theguide portion 14 d (i.e., a dimension by which theguide portion 14 d protrudes toward the interior of the thermostat device 4) is set by experiment or simulation, so that, when the discharge flow rate of theelectric water pump 2 is set high, the coolant that has flowed through the warm-up return passage 14 can reach thethermostatic element 44 a. - Since one of the engaging
pieces 61 is located on the side where the warm-up return pipe 14A is mounted, thecorresponding slit 62 formed in this engagingpiece 61 is also located on the side where the warm-up return pipe 14A is mounted. Namely, theslit 62 is located between theguide portion 14 d and thethermostatic element 44 a, and is located below the warm-up inflow port 42. Namely, the dimensions and location of theslit 62 are set by experiment or simulation, so that, when the discharge flow rate of theelectric water pump 2 is set low, the coolant that has flowed through the warm-up return passage 14 can be discharged from theslit 62, before reaching thethermostatic element 44 a. - Next, the coolant circulating operation in the
coolant circulation circuit 10 will be described. - Initially, the temperature of the coolant is low at the time of cold start of the
engine 5; therefore, the thermal expansion body of thethermostatic element 44 a contracts, and thevalve 44 c of thethermostat device 4 is closed. - Then, the
electric water pump 2 is operated, so that the coolant is circulated successively through theelectric water pump 2, pumpdischarge passage 11, block-side water jacket 52 a, head-side water jacket 51 a,engine outflow passage 12, warm-up return passage 14,thermostat device 4, and theelectric water pump 2, in the order of description. - Thus, since the circulating coolant bypasses the
radiator 3, the coolant is not cooled by theradiator 3, and theengine 5 is warmed up. - At this time, as control of the
electric water pump 2, the rotational speed of theelectric water pump 2 is set low, so that the discharge flow rate is reduced, as described above. When the flow rate is low, the momentum of the coolant current is reduced, so that the coolant that flows in through the warm-up inflow port 42 of thethermostat device 4 flows out through theslit 62 before reaching thethermostatic element 44 a, as indicated by outlined arrow LF inFIG. 4 . Namely, when the flow rate is low, the coolant from the warm-up inflow port 42 flows down or drops from a distal end of theguide portion 14 d, and is directed toward theslit 62. Further, since theoutflow portion 45 of thethermostat device 4 is connected with the admission port of theelectric water pump 2, the outflow of the coolant from theslit 62 is promoted, due to a negative pressure of theelectric water pump 2. Accordingly, the coolant warmed by theengine 5 is less likely or unlikely to hit or contact with thethermostatic element 44 a, and thevalve 44 c can be made less likely or unlikely to be unnecessarily opened. - Then, if the coolant temperature detected based on the output signal of the
water temperature sensor 101 is increased, and reaches a warm-up completion temperature, the rotational speed of theelectric water pump 2 is set high, and the discharge flow rate is increased, as described above, as control of theelectric water pump 2 after completion of warm-up. When the flow rate is high, the momentum of the coolant current is increased, so that the coolant flowing from the warm-up inflow port 42 of thethermostat device 4 is guided by theguide portion 14 d, and reaches thethermostatic element 44 a, as indicated by outlined arrow HF ofFIG. 4 . Namely, the coolant warmed by theengine 5 can be brought into contact with thethermostatic element 44 a, so that thevalve 44 c can be opened with good response. - In this case, circulation of the coolant indicated by arrows of one-dot chain lines in
FIG. 1 is performed, in addition to circulation of the coolant indicated by arrows of solid lines inFIG. 1 . Namely, the coolant is also circulated successively through theelectric water pump 2, pumpdischarge passage 11, block-side water jacket 52 a, head-side water jacket 51 a,engine outflow passage 12,radiator 3,radiator return passage 13,thermostat device 4, and theelectric water pump 2, in the order of description. Therefore, the coolant that has flowed through the warm-up return passage 14 and the coolant that has flowed through theradiator return passage 13 both flow into thethermostat device 4. Then, a part of the coolant flows through theradiator 3, and heat of the coolant is released to the atmosphere. - In this embodiment, the cooling system includes the
guide portion 14 d that guides the coolant flowing from the warm-up inflow port 42 toward thethermostatic element 44 a, and theslit 62 provided in theoutflow portion 45 and located between theguide portion 14 d and thethermostatic element 44 a, as described above. With this arrangement, during warm-up, it is possible to permit the coolant to flow out through theslit 62, before the coolant flowing from the warm-up inflow port 42 reaches thethermostatic element 44 a, by reducing the discharge flow rate of theelectric water pump 2, and reducing the momentum of the coolant current. Thus, during warm-up, the coolant that has been warmed is less likely or unlikely to hit or contact with thethermostatic element 44 a and open thevalve 44 c, so that early warm-up can be achieved. Accordingly, the fuel consumption rate can be improved. After completion of warm-up, the discharge flow rate of theelectric water pump 2 is increased, and the momentum of the coolant current is increased, so that the coolant flowing from the warm-up inflow port 42 can reach thethermostatic element 44 a via theguide portion 14 d. Thus, the warmed coolant can be brought into contact with thethermostatic element 44 a. As a result, thevalve 44 c can be opened with good response, after completion of warn-up, so that overheating can be suppressed. Consequently, it is possible to suppress overheating, while assuring early warm-up. - Also, in this embodiment, the coolant flows into the
electric water pump 2 from theoutflow portion 45 of thethermostat device 4; therefore, outflow of the coolant through theslit 62 is promoted due to a negative pressure of the electric water pump 22, and the coolant warmed during warm-up can be made less likely or unlikely to hit or contact with thethermostatic element 44 a. - It is to be understood that the embodiment disclosed herein is exemplary in all aspects, and does not provide a basis for limited interpretation. Accordingly, the technical scope of this disclosure should not be interpreted solely based on the above-described embodiment, but is defined based on the statement of the appended claims. The technical scope of the disclosure also includes all changes within the meaning and range of the claims and equivalents thereof.
- While the disclosure is applied to the cooling system for the engine for the automobile in the illustrated embodiment, the disclosure may be applied to cooling systems other than those of engines for automobiles.
- In the illustrated embodiment, a heater core, and other devices, may be provided in the
coolant circulation circuit 10. - This disclosure may be used in a cooling system for an internal combustion engine including a thermostat device that switches flow of coolant of the engine which is circulated by an electric water pump.
Claims (5)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2016250944A JP6572879B2 (en) | 2016-12-26 | 2016-12-26 | Cooling device for internal combustion engine |
JP2016-250944 | 2016-12-26 |
Publications (1)
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US20180179944A1 true US20180179944A1 (en) | 2018-06-28 |
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Family Applications (1)
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US15/839,969 Abandoned US20180179944A1 (en) | 2016-12-26 | 2017-12-13 | Cooling system for internal combustion engine and thermostat device |
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US (1) | US20180179944A1 (en) |
JP (1) | JP6572879B2 (en) |
CN (1) | CN108361100A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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US20200217270A1 (en) * | 2019-01-09 | 2020-07-09 | Haier Us Appliance Solutions, Inc. | Cooled piston and cylinder for compressors and engines |
Families Citing this family (2)
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JP7211873B2 (en) * | 2019-04-04 | 2023-01-24 | 日本サーモスタット株式会社 | thermostat device |
CN117469022A (en) | 2022-07-22 | 2024-01-30 | 丰田自动车株式会社 | Thermostat device |
Citations (2)
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US20110297365A1 (en) * | 2007-08-28 | 2011-12-08 | Toyota Jidosha Kabushiki Kaisha | Cooling device for vehicle |
US20130125856A1 (en) * | 2011-11-18 | 2013-05-23 | Honda Motor Co., Ltd. | Accessory mounting structure for internal combustion engine |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012059969A1 (en) * | 2010-11-01 | 2012-05-10 | トヨタ自動車株式会社 | Cooling system for internal combustion engine |
KR101338467B1 (en) * | 2012-10-16 | 2013-12-10 | 기아자동차주식회사 | Thermostat that the reactivity thereof is improved |
US8820272B2 (en) * | 2012-11-30 | 2014-09-02 | Caterpillar Inc. | Cooling system having shock reducing valve |
JP2015161273A (en) * | 2014-02-28 | 2015-09-07 | ダイハツ工業株式会社 | Cooling water control device of internal combustion engine |
JP6160646B2 (en) * | 2015-03-27 | 2017-07-12 | トヨタ自動車株式会社 | Engine cooling system |
-
2016
- 2016-12-26 JP JP2016250944A patent/JP6572879B2/en not_active Expired - Fee Related
-
2017
- 2017-12-13 US US15/839,969 patent/US20180179944A1/en not_active Abandoned
- 2017-12-22 CN CN201711403728.9A patent/CN108361100A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110297365A1 (en) * | 2007-08-28 | 2011-12-08 | Toyota Jidosha Kabushiki Kaisha | Cooling device for vehicle |
US20130125856A1 (en) * | 2011-11-18 | 2013-05-23 | Honda Motor Co., Ltd. | Accessory mounting structure for internal combustion engine |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20200217270A1 (en) * | 2019-01-09 | 2020-07-09 | Haier Us Appliance Solutions, Inc. | Cooled piston and cylinder for compressors and engines |
US10808646B2 (en) * | 2019-01-09 | 2020-10-20 | Haier Us Appliance Solutions, Inc. | Cooled piston and cylinder for compressors and engines |
Also Published As
Publication number | Publication date |
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JP2018105184A (en) | 2018-07-05 |
CN108361100A (en) | 2018-08-03 |
JP6572879B2 (en) | 2019-09-11 |
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