JP2017155672A - Liquid circulation system of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid circulation system capable of efficiently warming up an engine even when temperature of transmission oil is low.SOLUTION: A liquid circulation system 100 comprises a heat exchanger 104 exchanging heat between cooling water discharged from a water pressure pump 10 and oil discharged from a hydraulic pump 20, a valve device 27 in which a valve opening varies according to the temperature of the oil, a water circulation circuit 1 in which the cooling water discharged from the water pressure pump 10 circulates via an engine 101 and the heat exchanger 104, and an oil circulation circuit 2 in which the oil discharged from the hydraulic pump 20 circulates via a power transmission mechanism, the heat exchanger 104 and the valve device 27. The valve device 27 is configured such that the valve opening varies according to the temperature of the oil in the vicinity.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle liquid circulation system having an engine cooling water circulation circuit and an oil circulation circuit.

  Conventionally, there has been known a device in which an ATF warmer is disposed between an engine and an automatic transmission, and the temperature of the transmission oil is adjusted by exchanging heat between the engine coolant and the transmission oil using the ATF warmer. (See, for example, Patent Document 1). The device described in Patent Document 1 has a thermostat valve that opens and closes according to the cooling water temperature, and opens and closes the radiator path that communicates with the radiator by opening and closing the thermostat valve, while the ATF warmer is always cooled regardless of the cooling water temperature. Water is supplied, and heat is exchanged between the cooling water and the transmission oil both when the engine is cold and when the engine is warm.

Japanese Patent Laid-Open No. 2005-220828

  However, in the device described in Patent Document 1, since the cooling water is always supplied to the ATF warmer to exchange heat between the cooling water and the transmission oil, when the temperature of the transmission oil is low, the ATF warmer Heat exchange with the low-temperature transmission oil prevents the temperature of the cooling water from rising, making it difficult to efficiently warm up the engine.

  One aspect of the present invention is a liquid circulation system for a vehicle in which an engine cooled by cooling water and a power transmission mechanism that operates with hydraulic oil and transmits engine power to driving wheels are mounted. A hydraulic pump that discharges oil, a hydraulic pump that discharges oil used as hydraulic oil, a heat exchanger that exchanges heat between cooling water and oil, a valve device whose valve opening changes according to the temperature of the oil, A water circulation circuit configured to circulate cooling water discharged from the water pressure pump through the engine and the heat exchanger, and oil discharged from the hydraulic pump through the power transmission mechanism, the heat exchanger, and the valve device. And an oil circulation circuit configured to circulate, wherein the valve device is configured such that the valve opening changes in accordance with the temperature of oil in the vicinity of the valve device.

  According to the present invention, the oil ring circuit is configured so that the oil discharged from the hydraulic pump circulates through the power transmission mechanism, the heat exchanger, and the valve device, and also according to the temperature of the oil in the vicinity of the valve device. The valve device is configured so that the valve opening changes. For this reason, when the temperature of the transmission oil in the vicinity of the valve device is low, the flow of the transmission oil through the heat exchanger is blocked, and the engine can be warmed up efficiently. In the state where the flow of transmission oil through the heat exchanger is blocked, the cooling water temperature and the temperature of the transmission oil in the vicinity of the heat exchanger are substantially equal, but the valve device is connected to the casing of the power transmission mechanism. If it arrange | positions inside, the temperature of the transmission oil near a heat exchanger and the temperature of the transmission oil near a valve apparatus will respond | correspond favorably, and a valve apparatus can be operated at a suitable timing.

The circuit diagram which shows the principal part structure of the liquid circulation system of the vehicle which concerns on embodiment of this invention. The front view which shows roughly the arrangement | positioning of an engine and a transmission when the vehicle to which the liquid circulation system which concerns on embodiment of this invention is applied is seen from the front. The figure which shows an example of arrangement | positioning of the thermostat which comprises the liquid circulation system of FIG. The figure which shows the modification of FIG. 3A. The figure which shows arrangement | positioning of the thermostat of FIG. 3A in detail.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a circuit diagram showing a main configuration of a liquid circulation system for a vehicle according to an embodiment of the present invention. The liquid circulation system 100 is applied to a vehicle equipped with a water-cooled engine and a power transmission mechanism that transmits engine power to driving wheels.

  FIG. 2 is a front view schematically showing the arrangement of the engine 101 and the transmission 102 in the engine room when the vehicle according to the embodiment of the present invention is viewed from the front. As shown in FIG. 2, the engine 101 and the transmission 102 are disposed adjacent to each other in the vehicle width direction, for example. The transmission 102 includes a torque converter to which the power of the engine 101 is input, and shifts and outputs the power output from the torque converter. Hereinafter, the transmission 102 will be described as a continuously variable transmission (CVT). Although not shown in FIG. 2, a radiator 15 (FIG. 1) is disposed in front of the engine 101.

  A control valve 103 that controls the flow of oil (referred to as transmission oil) to each part of the transmission 102 is disposed below the transmission 102. A CVT warmer (hereinafter simply referred to as a heat exchanger) 104 for exchanging heat between the coolant of the engine 101 and the transmission oil is disposed at a side end portion of the transmission 102. The heat exchanger 104 is connected to a pipe line 110 through which cooling water from the engine 101 flows in and out and a pipe line 111 through which transmission oil flows in and out. The pipe line 110 is exposed to the outside, while the pipe line 111 is provided inside the transmission 102.

  As shown in FIG. 1, the liquid circulation system 100 includes a water circulation circuit 1 through which cooling water discharged from the hydraulic pump 10 circulates, and an oil circulation circuit 2 through which transmission oil discharged from the hydraulic pump 20 circulates. . In FIG. 1, the water circulation circuit 1 is indicated by a solid arrow, and the oil circulation circuit 2 is indicated by a dotted arrow.

  First, the configuration of the water circulation circuit 1 will be described. The cooling water discharged from the hydraulic pump 10 passes through the cylinder block 11 of the engine 101 and a flow path around the cylinder head (represented by the cylinder block 11 in FIG. 1), and cools the engine 101. At this time, the temperature of the cooling water that has passed around the cylinder block 11 rises. A bypass valve 12, a heater 13, a throttle valve 14, a heat exchanger 104 (FIG. 1), and a radiator 15 are connected to the outlet of the flow path around the cylinder block 11. A thermostat 16 is connected to the outlet of the flow path of the radiator 15.

  The heat exchanger 104 has a water passage through which cooling water passes and an oil passage through which transmission oil passes. A plurality of water channels and oil channels are alternately arranged in parallel and close to each other. Various heat exchangers 104 having a water channel and an oil channel can be used.

  The bypass valve 12 and the thermostat 16 are integrally configured as a thermostat assembly 17. The thermostat 16 is a valve device that opens and closes according to the coolant temperature. The thermostat 16 is configured to enclose, for example, wax as a temperature sensing portion inside and open and close the valve by thermal expansion of the wax. That is, when the cooling water temperature is lower than the predetermined temperature T1, the thermostat 16 is closed to block the flow of the cooling water to the radiator 15. Thereby, warming up of the engine 101 is promoted.

  On the other hand, when the cooling water temperature becomes equal to or higher than the predetermined temperature T <b> 1, the thermostat 16 is opened, and a part of the cooling water that has passed through the flow path around the cylinder block 11 flows through the radiator 15. As a result, heat is exchanged between the cooling water and the atmosphere, and the cooling water is cooled. The cooling water that has passed through the radiator 15 and has reached a low temperature passes through the thermostat 16 and returns to the hydraulic pump 10.

  The bypass valve 12 is opened when the pressure of the cooling water flowing out from the flow path around the cylinder block 11 exceeds a predetermined value. As a result, part of the cooling water that has passed through the flow path around the cylinder block 11 returns to the hydraulic pump 10 as it is via the bypass valve 12.

  A part of the cooling water that has passed through the flow path around the cylinder block 11 is also supplied to the heater 13 of the air conditioner, the flow path around the throttle valve 14, and the heat exchanger 104. In the heater 13, the air is heated by the heat of the cooling water, and the heated air is blown into the vehicle by the air conditioner to heat the interior of the vehicle. The throttle valve 14 is heated by the heat of the cooling water flowing around it, thereby preventing the throttle valve 14 from freezing and sticking at an extremely low temperature.

  The cooling water that has passed through the heater 13, the throttle valve 14, and the heat exchanger 104 passes through the thermostat assembly 17 and returns to the hydraulic pump 10. In particular, in the present embodiment, since a thermostat is not provided in the middle of the pipe line 110 (FIG. 1) connecting the cylinder block 11 and the heat exchanger 104, the cooling water is always supplied to the heat exchanger 104 regardless of the cooling water temperature. Pass through.

  Next, the configuration of the oil circulation circuit 2 will be described. The transmission oil discharged from the hydraulic pump 20 is adjusted to a predetermined pressure P1 (for example, 1 to 5 MPa) by the pressure adjustment valve 21. Transmission oil at a predetermined pressure P1 is supplied to a predetermined oil chamber in the transmission 102 as hydraulic oil for driving hydraulic equipment such as a CVT pulley and a clutch (such as a forward / reverse clutch and a start clutch). Excess transmission oil through the pressure regulating valve 21 is regulated to a predetermined pressure P2 (for example, about 0.1 to 0.6 Mpa) smaller than P1 by the pressure regulating valve 23. Transmission oil at a predetermined pressure P2 is supplied to the torque converter 24 as hydraulic oil. Excess transmission oil through the pressure regulating valve 23 is supplied as lubricating oil to a predetermined portion (lubricating section 25) that requires lubrication. Transmission oil that has flowed out of the hydraulic device 22 and the lubrication unit 25 returns to the hydraulic pump 20.

  A heat exchanger 104 and a check valve 26 are connected to the outlet of the flow path of the torque converter 24. A thermostat 27 is connected to the outlet of the flow path of the heat exchanger 104. The thermostat 27 is a valve device that opens and closes according to the oil temperature in the vicinity of the thermostat. The thermostat 27 is configured to enclose, for example, wax as a temperature sensing portion inside and open and close the valve by thermal expansion of the wax. That is, when the oil temperature of the temperature sensing part in the thermostat is lower than the predetermined temperature T2, the thermostat 27 is closed and the flow of transmission oil passing through the heat exchanger 104 is shut off. As a result, heat exchange between the cooling water and the transmission oil in the heat exchanger 104 is suppressed, so that warm-up of the engine 101 is promoted.

  On the other hand, when the oil temperature in the vicinity of the thermostat becomes equal to or higher than the predetermined temperature T2, the thermostat 27 is opened, and the transmission oil that has passed through the heat exchanger 104 returns to the hydraulic pump 20 via the thermostat 27. As a result, heat is exchanged between the coolant and the transmission oil, and the temperature of the transmission oil (for example, the temperature detected in the oil pan) is adjusted. Note that the temperature detected in the oil pan is the overall temperature of the transmission oil, and in order to distinguish it from the local temperature of the transmission oil in the vicinity of the heat exchanger 104, this is hereinafter referred to as a representative temperature. Sometimes.

  The predetermined temperature T2 that serves as a reference for opening and closing the thermostat 27 is preferably lower than the predetermined temperature T1 that serves as a reference for opening and closing the thermostat 16. For example, the thermostats 16 and 27 are set so that the predetermined temperature T1 is about 80 ° C. to 90 ° C. and the predetermined temperature T2 is about 70 ° C. to 80 ° C. Thus, after the heat exchange between the cooling water and the transmission oil is started by opening the thermostat 27, that is, after the warming-up of the transmission 102 is started, the thermostat 16 is opened and the cooling water is supplied to the radiator 15. And overheating of the engine 101 can be prevented.

  The check valve 26 (also referred to as a one-way valve) is provided in the bypass circuit 2A that bypasses the heat exchanger 104 and the thermostat 27. The check valve 26 is a check valve that closes when the pressure of transmission oil upstream thereof is less than a predetermined value P3 and opens when the pressure exceeds a predetermined value P3. The predetermined value P3 is set to a value that is larger than the total pressure loss of the heat exchanger 104 and the thermostat 27 and less than the predetermined value P2. When the check valve 26 is opened, the check valve 26 allows the flow of the transmission oil in one direction to flow back from the flow path outlet of the torque converter 24 to the hydraulic pump 20 and prohibits the flow of the transmission oil in the reverse direction. The pressure regulating valves 21 and 23 and the check valve 26 are incorporated in the control valve 103 (FIG. 1).

  As a characteristic configuration of the present embodiment, the thermostat 27 is arranged inside the case of the transmission 102 in addition to always circulating the cooling water through the heat exchanger 104. 3A is a diagram illustrating an example of the arrangement of the thermostat 27, and FIG. 3B is a diagram illustrating a comparative example of FIG. 3A. In FIGS. 3A and 3B, the flow of cooling water and the flow of transmission oil are indicated by dotted and solid arrows, respectively.

  As shown in FIG. 3A, the heat exchanger 104 is attached to the case 102 a of the transmission 102, and the thermostat 27 is disposed inside the case 102 a adjacent to the heat exchanger 104. FIG. 4 is a cross-sectional view of the main part of the case 102a showing the arrangement of the thermostat 27 in more detail.

  As shown in FIG. 4, the heat exchanger 104 is attached to the end surface of the case 102 a with a bolt 105. An end surface of the case 102a is provided with an outflow portion 102b through which transmission oil flows out from the case into the heat exchanger 104, and an inflow portion 102c through which transmission oil flows into the case from the heat exchanger 104. The thermostat 27 has a substantially cylindrical shape, and has a valve body that moves due to thermal expansion of wax therein.

  The inflow portion 102 c of the case 102 a is formed in a cylindrical shape corresponding to the outer shape of the thermostat 27. That is, a cylindrical hole having a hole diameter corresponding to the outer diameter of the thermostat 27 is formed by a predetermined depth corresponding to the length of the thermostat 27 from the case end surface. Downstream of the inflow portion 102c, the hole diameter is reduced, and the inflow portion 102c is formed in a stepped shape. Thereby, after inserting the thermostat 27 in the inflow part 102c, the thermostat 27 can be fixed in the state adjacent to the heat exchanger 104 by attaching the heat exchanger 104 to a case end surface and covering the thermostat 27. O-rings 106 and 107 are interposed between the case end surface and the end surface of the heat exchanger 104 so as to seal the outflow portion 102b and the inflow portion 102c.

  A characteristic operation of the vehicle liquid circulation system 100 according to the embodiment of the present invention will be described with reference to FIGS. 1 and 3A. If the local temperature of the transmission oil in the vicinity of the heat exchanger 104 is equal to the representative temperature of the transmission oil, such as immediately after the engine 101 is cold started, and the temperature is lower than the predetermined temperature T2, the thermostat 27 closes and the flow of transmission oil through the heat exchanger 104 in a low temperature state is blocked. At this time, the cooling water circulates through the heat exchanger 104 regardless of whether the thermostat 27 is opened or closed. Although the cooling water temperature after engine startup becomes higher than the representative temperature of the transmission oil, the heat exchange between the cooling water and the low-temperature transmission oil is suppressed by closing the thermostat 27. Thereby, the engine 101 can be warmed up efficiently.

  When the thermostat 27 is closed, the transmission oil heated through the torque converter 24 circulates via the check valve 26 via the bypass circuit 2A. That is, the transmission oil circulates bypassing the heat exchanger 104. Thereby, the temperature of the entire transmission oil can be raised quickly, and the efficiency of the transmission 102 can be increased.

  When the thermostat 27 is closed, the heat exchanger 104 rises in temperature due to the heat from the cooling water that has passed through the engine 101 and is heated, and the transmission oil remaining in the heat exchanger 104 The local temperature is approximately equal to the temperature of the cooling water. Further, in the present embodiment, since the thermostat 27 is disposed inside the transmission 102 adjacent to the heat exchanger 104, the temperature of the thermostat 27 increases following the temperature increase of the cooling water, and the cooling water temperature And the local temperature of the transmission oil in the heat exchanger 104 and the temperature of the thermostat 27 are substantially equal to each other.

  For this reason, when the local temperature of the transmission oil in the vicinity of the heat exchanger 104 reaches the predetermined temperature T2, the temperature of the temperature sensing portion (wax) of the thermostat 27 also becomes the predetermined temperature T2 with high responsiveness, and the thermostat 27 changes the transmission oil. The valve opens without delay following the temperature of. Thereby, the transmission oil circulates through the heat exchanger 104, and heat exchange between the transmission oil and the cooling water in the heat exchanger 104 is started. Therefore, heat exchange between the transmission oil and the cooling water can be started with good timing, and the transmission oil can be raised in temperature early and the efficiency of the transmission 102 can be increased.

  When the cooling water temperature reaches the predetermined temperature T <b> 1, the thermostat 16 is opened and the cooling water circulates through the radiator 15. As a result, an increase in the coolant temperature is suppressed, and overheating of the engine 101 can be prevented. At this time, since heat exchange between the cooling water and the transmission oil in the heat exchanger 104 is continued, the representative temperature of the transmission oil is adjusted to a temperature corresponding to the cooling water temperature.

  As described above, in this embodiment, the thermostat 27 is provided inside the transmission 102 in order to promote warm-up of both the engine 101 and the transmission 102. On the other hand, in order to promote warm-up of the engine 101, as shown in the comparative example of FIG. 3B, when the thermostat 27A is arranged in the middle of the pipe 110 and the cooling water temperature is lower than a predetermined temperature, the heat exchanger 104 It is also conceivable that the heat exchange between the cooling water and the transmission oil is not performed. In FIG. 3B, a thermostat is not provided in the transmission oil circulation circuit, and the transmission oil constantly circulates through the heat exchanger 104.

  In the configuration of FIG. 3B, the thermostat 27A is closed at a low temperature of the cooling water, and the cooling water does not pass through the thermostat 27A. For this reason, the thermostat 27A is heated mainly by the heat conduction of the cooling water via the pipe 110, and the temperature rise of the thermostat 27A is delayed with respect to the rise of the cooling water temperature. Furthermore, since the conduit 110 and the thermostat 27A are exposed, the temperature of the thermostat 27A is easily affected by the surrounding environment such as the outside air temperature and traveling wind, and the temperature rise of the thermostat 27A varies. The temperature of the thermostat 27A is also affected by the vehicle body layout (arrangement of cooling fans, etc.). As a result, the thermostat 27A may not open at the intended timing, and the desired performance of the transmission 102 or the like may not be obtained due to the delay in opening the thermostat 27A.

  3B, the transmission oil circulates through the heat exchanger 104 regardless of the temperature of the transmission oil. Since the cooling water does not circulate through the heat exchanger 104 when the thermostat 27A is closed, the heat exchanger 104 and the cooling water staying in the heat exchanger 104 remain at a low temperature, and the heat of the transmission oil is transferred to the heat exchanger. It is taken away by 104 and the cooling water which stays in it. As a result, the temperature rise of the transmission oil is hindered, and the warm-up of the transmission 102 is delayed.

  In this regard, in the present embodiment, a thermostat 27 for permitting or prohibiting heat exchange between the cooling water and the transmission oil in the heat exchanger 104 is disposed inside the case 102 a of the transmission 102. For this reason, the thermostat 27 can be operated with good response to the temperature of the transmission oil without being affected by the traveling environment, the vehicle body layout, and the like. Further, when the thermostat 27 is closed, the transmission oil is prevented from circulating through the heat exchanger 104 in a low temperature state, so that the transmission oil can be raised in temperature early.

According to this embodiment, the following effects can be obtained.
(1) The liquid circulation system 100 is applied to a vehicle on which an engine 101 cooled by cooling water and a transmission 102 that operates by transmission oil and transmits the power of the engine 101 to driving wheels are mounted ( Figure 2). The liquid circulation system 100 includes a hydraulic pump 10 that discharges cooling water, a hydraulic pump 20 that discharges transmission oil, a heat exchanger 104 that exchanges heat between the cooling water and transmission oil, and the temperature of the transmission oil. A thermostat 27 that opens and closes in response to the pressure, a water circulation circuit 1 configured such that cooling water discharged from the hydraulic pump 10 circulates through the engine 101 (cylinder block 11 and the like) and the heat exchanger 104, 20 includes an oil circulation circuit 2 configured to circulate transmission oil discharged from 20 through a transmission 102 (torque converter 24, etc.), a heat exchanger 104, and a thermostat 27 (FIG. 1). 27 is configured such that the valve opening changes in accordance with the temperature of oil in the vicinity thereof. As a result, when the transmission oil in the vicinity of the heat exchanger 104 is at a low temperature, the flow of the transmission oil passing through the heat exchanger 104 in the low temperature state is blocked by the thermostat 27, and the engine 101 is efficiently warmed up. be able to.

(2) The thermostat 27 is disposed inside the case 102a of the transmission 102 (FIG. 3A). Thus, since the thermostat 27 is not exposed to the outside, the temperature around the thermostat 27 is not cooled by the traveling wind, and the temperature is stabilized. Regardless of the traveling environment or the vehicle body layout, the temperature of the transmission oil near the heat exchanger The temperature of the transmission oil in the vicinity of the thermostat corresponds well. For this reason, the thermostat 27 is heated with good responsiveness following the temperature rise of the transmission oil in the vicinity of the heat exchanger, that is, the transmission oil heated by the heat from the cooling water passing through the heat exchanger 104. Can do. Therefore, the thermostat 27 can be opened with good timing according to the local temperature of the transmission oil in the vicinity of the heat exchanger, and desired performance of the transmission 102 and the like can be obtained. Further, a bracket for fixing the thermostat 27, a hose connected to the thermostat 27, and the like can be omitted, and the configuration can be simplified.

(3) The heat exchanger 104 is attached to the case 102a of the transmission 102, and the thermostat 27 is disposed adjacent to the heat exchanger 104 (FIG. 4). For this reason, heat is transferred from the cooling water to the thermostat 27 via the heat exchanger 104, and the temperature of the temperature sensing part of the thermostat 27 can be made to follow the temperature of the cooling water well. Therefore, when the local temperature of the transmission oil near the heat exchanger reaches the predetermined temperature T2, the thermostat 27 can be opened without delay, and heat exchange between the cooling water and the transmission oil is started at an optimal timing. can do.

(4) The oil circulation circuit 2 is configured such that transmission oil discharged from the hydraulic pump 20 bypasses the heat exchanger 104 and the thermostat 27 and circulates through the transmission 102 (torque converter 24 and the like). And further includes a bypass circuit 2A (FIG. 1). As a result, the transmission oil heated through the torque converter 24 circulates by bypassing the heat exchanger 104 in a low temperature state, so that the transmission oil can be supplied early while improving the warm-up performance of the engine 101. The temperature can be raised.

(Modification)
The above embodiment can be modified into various forms. In the above embodiment, the transmission 102 is configured as a continuously variable transmission, but may be configured as a stepped transmission. Therefore, as the transmission oil, in addition to the CVT oil, other oils used as hydraulic oil for operating the power transmission mechanism such as AT oil can be used. The transmission 102 as a power transmission mechanism that transmits engine power to the drive wheels may be a manual transmission instead of an automatic transmission. In the above embodiment, the transmission 102 has the torque converter 24, but the power transmission mechanism may have a wet clutch (for example, a wet dual clutch) instead of the torque converter. Therefore, the configuration of the casing of the power transmission mechanism is not limited to the case 102a of the transmission 102 described above.

  In the above-described embodiment, the thermostat 27 that opens and closes according to the temperature of the transmission oil is used in the oil circulation circuit 2, but other valves configured such that the valve opening degree changes according to the temperature of the oil in the vicinity thereof. An apparatus can also be used. In this case, it is preferable that the valve device is not operated by a control signal from the outside, but is operated by a temperature change of its own temperature sensing unit. Other than wax may be used for the temperature sensitive part. In the above embodiment, the heat exchanger 104 is attached to the case 102a of the transmission 102, and the thermostat 27 is arranged in the case 102a adjacent to the heat exchanger 104. However, the arrangement of the valve device is not limited thereto. For example, you may arrange | position outside the case 102a. That is, the present invention is applicable even when the oil circulation circuit to which the valve device is connected is exposed to the outside.

  In the above embodiment, the check circuit 26 is provided in parallel with the heat exchanger 104 and the thermostat 27 to configure the bypass circuit 2A. However, the heat exchanger and valve in which the oil discharged from the hydraulic pump is in a low temperature state The bypass circuit may have any configuration as long as it is configured to bypass the device and circulate through the power transmission mechanism. If the cooling water discharged from the hydraulic pump is configured to circulate through the engine and the heat exchanger, the configuration of the water circulation circuit is not limited to that described above. If the oil discharged from the hydraulic pump is configured to circulate through the power transmission mechanism, the heat exchanger, and the valve device, the configuration of the oil circulation circuit is not limited to that described above.

  The above description is merely an example, and the present invention is not limited to the above-described embodiments and modifications unless the features of the present invention are impaired. The constituent elements of the embodiment and the modified examples include those that can be replaced while maintaining the identity of the invention and that are obvious for replacement. That is, other forms conceivable within the scope of the technical idea of the present invention are also included in the scope of the present invention. Moreover, it is also possible to arbitrarily combine one or more of the above-described embodiments and modified examples. Variations can be combined.

DESCRIPTION OF SYMBOLS 1 Water circulation circuit, 2 Oil circulation circuit, 10 Hydraulic pump, 20 Hydraulic pump, 24 Torque converter, 27 Thermostat, 100 Liquid circulation system, 101 Engine, 102 Transmission, 102a Case, 104 Heat exchanger

Claims (4)

A vehicle liquid circulation system equipped with an engine cooled by cooling water and a power transmission mechanism that operates by hydraulic oil and transmits power of the engine to drive wheels,
A hydraulic pump for discharging the cooling water;
A hydraulic pump for discharging oil used as the hydraulic oil;
A heat exchanger for exchanging heat between the cooling water and the oil;
A valve device whose valve opening changes in accordance with the temperature of the oil;
A water circulation circuit configured to circulate cooling water discharged from the water pressure pump through the engine and the heat exchanger;
An oil circulation circuit configured to circulate the oil discharged from the hydraulic pump through the power transmission mechanism, the heat exchanger, and the valve device;
The said valve apparatus is comprised so that a valve opening may change according to the temperature of the oil of the vicinity of the said valve apparatus, The liquid circulation system of the vehicle characterized by the above-mentioned. The liquid circulation system for a vehicle according to claim 1,
The liquid circulation system for a vehicle, wherein the valve device is disposed inside a housing of the power transmission mechanism. The vehicle liquid circulation system according to claim 2,
The vehicle liquid circulation system, wherein the heat exchanger is attached to the housing of the power transmission mechanism, and the valve device is disposed adjacent to the heat exchanger. The vehicle liquid circulation system according to any one of claims 1 to 3,
The oil circulation circuit has a bypass circuit configured such that oil discharged from the hydraulic pump bypasses the heat exchanger and the valve device and circulates through the power transmission mechanism. The vehicle's liquid circulation system.

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