JP2010216542A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger for constituting an oil temperature control system which has improved capability of reducing extra pressure loss along with the circulation of operating oil and controlling the temperature of the operating oil. <P>SOLUTION: The heat exchanger 12 includes a bypass oil path 23 provided between an introduction side end 20a and a return side end 20b of an operating oil flow path 20 for bypassing a heat exchange part 22 when circulating operating oil, and an operating oil delivery path 24 for delivering the operating oil from the return side end 20b to a cooling oil path 13. It also includes a four-way valve 25 for changing over the conditions of communicating the bypassing oil path 23 and the operating oil delivery path 24 with the return side end 20b of the operating oil flow path 20 into a warming mode, a steady mode, or a cooling mode. The four-way valve 25 is controlled to change over them in accordance with an external signal. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a heat exchanger for adjusting the temperature of hydraulic oil of a torque converter type automatic transmission or the like in a vehicle.

  Conventionally, as this type of technology, for example, there is one disclosed in Patent Document 1. As shown in FIG. 8, in the configuration of Patent Document 1, hydraulic oil that circulates hydraulic oil in the automatic transmission 50 externally in a heat exchange portion 52 of a heat exchanger 51 provided in the automatic transmission 50. A flow path 53 is provided, and a cooling oil path 55 having an oil cooler 54 on the path is branched from a return side end 53a of the hydraulic oil flow path 53. Further, at the upstream branch portion between the hydraulic oil passage 53 and the cooling oil passage 55, a flow rate adjusting valve (consisting of a thermo valve) that adjusts the flow rate ratio of the hydraulic oil flowing from the hydraulic oil passage 53 to the cooling oil passage 55 side. ) 56 is provided. The flow rate adjustment valve 56 autonomously opens and closes according to the temperature of the hydraulic oil in the hydraulic oil passage 53. When the temperature of the hydraulic oil is low, the flow rate adjusting valve 56 restricts the outflow of the hydraulic oil to the cooling oil passage 55 side, the cooling of the hydraulic oil by the oil cooler 54 is avoided, and the hydraulic oil is heated. On the other hand, when the temperature of the hydraulic oil is high, the flow rate adjusting valve 56 allows the hydraulic oil to flow out to the cooling oil passage 55, and the hydraulic oil is cooled by the oil cooler 54. Further, the configuration disclosed in Patent Document 2 is obtained by replacing the flow rate adjustment valve 56 in Patent Document 1 with an electromagnetic switching valve that is switched and controlled by a control device. Also with this configuration, the same operation as the configuration of Patent Document 1 can be obtained.

  Moreover, in the structure of patent document 3, as shown in FIG. 9, between the introduction side edge part 62a and the return side edge part 62b of the hydraulic fluid flow path 62 provided in the heat exchange part 61 of the heat exchanger 60 is shown. A bypass oil passage 63 that bypasses the heat exchange unit 61 is provided between them. In addition, at each connection portion between the introduction side end portion 62 a and the return side end portion 62 b and the bypass oil passage 63, the operation oil passage supplied from the automatic transmission is connected to the operation oil passage 62 and the bypass oil passage 63. Electromagnetic flow path switching valves 64 are provided for switching at the same time. The both flow path switching valve 64 is switch-controlled by a control device that generates a control signal based on the coolant temperature of the engine and the hydraulic oil temperature of the automatic transmission. When the hydraulic fluid is guided from the automatic transmission to the hydraulic fluid passage 62 by the operation of the two passage switching valves 64, the hydraulic fluid is heated or cooled by the cooling water of the engine. On the other hand, when the hydraulic oil is guided to the bypass oil path 63 by the operation of the two flow path switching valves 64, heating or cooling of the hydraulic oil by the cooling water is avoided.

JP 2005-226619 A JP 2006-207606 A JP 2006-238772 A

  However, according to the configurations of Patent Documents 1 and 2, the hydraulic oil always flows through the hydraulic oil passage 53 even when heating or cooling is unnecessary. For this reason, excessive pressure loss due to the circulation of the hydraulic oil occurs, and the deterioration of the hydraulic oil is promoted by unnecessary heating after the engine warms up, or the temperature of the hydraulic oil is increased by unnecessary cooling at the cold start. The rise may be hindered.

  Moreover, according to the structure of patent document 3, since hydraulic fluid is cooled only by the heat exchanger 60, when the temperature of hydraulic fluid rises too much by excessive engine load, the cooling of hydraulic fluid will generate | occur | produce. There is. As a result, deterioration of the hydraulic oil may be promoted.

  An object of the present invention is to provide a heat exchanger that can constitute an oil temperature control system that has an excellent ability to adjust the temperature of hydraulic oil while reducing excessive pressure loss due to circulation of the hydraulic oil. .

  The invention according to claim 1 is provided with a hydraulic fluid passage that allows hydraulic fluid supplied from the automatic transmission to pass therethrough, and a cooling fluid passage that allows cooling water supplied from the engine to pass therethrough. A heat exchanging portion that exchanges heat with the passage, a bypass oil passage that communicates the introduction side end portion and the return side end portion of the hydraulic oil passage so as to bypass the heat exchange portion, and the return side end The hydraulic oil delivery path branched from the part toward the outside, and the communication state of the bypass oil path and the hydraulic oil delivery path with respect to the return side end of the hydraulic oil flow path is operated based on the external signal, and the introduction side A heating mode for introducing hydraulic oil from the end into the hydraulic oil flow path and returning it from the return side end to the automatic transmission, and a return side end by introducing hydraulic oil from the introduction side end to the bypass oil passage Operation from the introduction side end to the hydraulic oil flow path Circulating the delivery path to the outside, characterized in that a flow channel switching means for switching to one of the cooling mode.

(Function)
The present invention has the following effects. In the external control device, for example, based on the hydraulic oil temperature and the cooling water temperature, a heating mode for heating the hydraulic oil, a cooling mode for cooling the hydraulic oil, or a steady mode that neither warms nor cools the hydraulic oil. Is set. The flow path switching means is controlled by an external signal generated by the control device corresponding to each mode. In the heating mode, the hydraulic oil is introduced into the hydraulic oil flow path from the introduction side end and returned to the automatic transmission from the return side end, so that the hydraulic oil passes through the cooling water flow path in the heat exchange section. And the cooling of the hydraulic oil by the oil cooler provided on the hydraulic oil delivery path is avoided. Therefore, in the heating mode, pressure loss when the hydraulic oil circulates through the hydraulic oil delivery path to the oil cooler circuit is avoided, and the hydraulic oil is efficiently heated. Further, in the steady mode, the operating oil is introduced into the bypass oil passage from the introduction side end portion and returned from the return side end portion into the automatic transmission, so that heating or cooling of the operation oil in the heat exchange portion is avoided. At the same time, cooling of the hydraulic oil in the oil cooler is avoided. Therefore, in the steady mode, pressure loss when the hydraulic oil passes through the hydraulic oil passage and the hydraulic oil delivery passage is avoided, and unnecessary heating and cooling of the hydraulic oil are avoided. Furthermore, in the cooling mode, the working oil is cooled by the cooling water in the heat exchange section by introducing the working oil from the introduction side end to the working oil flow path and circulating it from the working oil delivery path to the oil cooler circuit. At the same time, the hydraulic oil is further cooled by the oil cooler. Therefore, in the cooling mode, the hydraulic oil is efficiently cooled by the heat exchanger and the oil cooler.

  According to the present invention, it is possible to configure an oil temperature control system that can reduce an excess pressure loss accompanying the circulation of the hydraulic oil and that has an excellent ability to adjust the temperature of the hydraulic oil.

The schematic diagram which shows the oil temperature control system of the automatic transmission provided with the heat exchanger of 1st Embodiment. The schematic cross section which shows the heat exchanger of a heating mode. The schematic cross section which shows the heat exchanger of a steady mode. The schematic cross section which shows the heat exchanger of cooling mode. The schematic cross section which shows the heat exchanger of 2nd Embodiment. The schematic cross section which shows the heat exchanger of a steady mode. The schematic cross section which shows the heat exchanger of cooling mode. The schematic diagram which shows the oil temperature control system of the automatic transmission provided with the conventional heat exchanger. The schematic diagram which shows the conventional heat exchanger.

(First embodiment)
Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS.
As shown in FIG. 1, a torque converter type automatic transmission 11 is assembled to a vehicle engine 10, and hydraulic oil (ATF: Automatic Transmission Fluid) in the automatic transmission 11 is installed in a housing of the automatic transmission 11. A heat exchanger 12 for heating or cooling is mounted. A cooling oil path 13 through which hydraulic oil is sent out extends from the heat exchanger 12, and the other end of the cooling oil path 13 is connected to a hydraulic oil inlet (not shown) provided in the housing of the automatic transmission 11. Has been. An air-cooled oil cooler 14 is provided on the cooling oil passage 13.

  Further, a cooling water circulation path 15 for sending cooling water is extended from the engine 10, and the other end is connected to a cooling water path in the engine 10 via a water pump 16. A radiator 17 is provided on the cooling water circulation path 15. The oil cooler 14 may be a water-cooled type that uses the cooling water of the cooling water circulation path 15. That is, a water-cooled oil cooler configured to perform heat exchange between the cooling water circuit branched from the cooling water circulation path 15 and the cooling oil path 13 may be used.

  Further, from the engine 10, a heater circulation water passage 18 for sending out cooling water is extended and connected to the cooling water passage in the engine 10 through the water pump 16. On the heater circulation channel 18, the heat exchanger 12 and the heater core 19 are provided. The heat exchanger 12 may be provided on a heating / cooling water channel provided separately from the cooling water circulation channel 15 and the heater circulation water channel 18.

  As shown in FIG. 2, the heat exchanger 12 includes a hydraulic oil passage 20 that circulates the hydraulic oil in the automatic transmission 11, and the hydraulic oil passage 20 draws hydraulic oil from the inside of the automatic transmission 11. An introduction side end portion 20 a to be introduced and a return side end portion 20 b for returning the working oil to the inside of the automatic transmission 11 are provided. Further, the heat exchanger 12 includes a cooling water passage 21 through which the cooling water supplied from the engine 10 to the heater circulation water passage 18 passes. The cooling water passage 21 and the hydraulic oil passage 20 constitute a heat exchanging unit 22 that exchanges heat between the cooling water and the hydraulic oil. Further, the heat exchanger 12 includes a bypass oil passage 23 that bypasses the heat exchange portion 22 and communicates the introduction side end 20a and the return side end 20b of the hydraulic oil passage 20. Furthermore, the heat exchanger 12 includes a hydraulic oil delivery path 24 that feeds hydraulic oil from the return side end 20b to the cooling oil path 13.

  The bypass oil path 23 and the hydraulic oil delivery path 24 are connected to one place at the return side end 20b of the hydraulic oil flow path 20, and the bypass oil path 23 and the hydraulic oil delivery to the return side end 20b are connected to this connection part. A four-way electromagnetic valve (hereinafter abbreviated as a four-way valve) 25 is provided as a flow path switching means for switching the communication state of the path 24. As shown in FIG. 1, the four-way valve 25 performs a switching operation based on a control signal S0 generated by a control device 26 composed of a computer.

  The control device 26 operates according to a control program. For example, a hydraulic oil temperature To detected by a hydraulic oil temperature sensor 27 provided in the housing of the automatic transmission 11 and a cooling water temperature sensor 28 provided on the cooling water flow path 21 are provided. Based on the detected coolant temperature Tw, a control signal S0 for switching and controlling the four-way valve 25 is generated. Based on the hydraulic oil temperature To and the cooling water temperature Tw, the control device 26 warms the hydraulic oil with the cooling water, cools the hydraulic oil with the cooling water, and neither warms nor cools the hydraulic oil. Determine the state. The state in which the hydraulic oil is heated is, for example, when the temperature of the cooling water has increased to a value at which the hydraulic oil can be heated after the engine 10 is cold started. The state of cooling the hydraulic oil is when the temperature of the hydraulic oil rises excessively due to, for example, an excessive load applied to the engine 10 or the automatic transmission 11. Furthermore, the state in which neither the operating oil is heated nor cooled is, for example, when the temperature of the cooling water and the operating oil is low at the cold start of the engine 10 or when the warming of the automatic transmission 11 is completed. When it reaches a certain temperature. Then, according to the determination result, the control device 26 sets a heating mode for heating the hydraulic oil, a cooling mode for cooling the hydraulic oil, or a steady mode for neither heating nor cooling the hydraulic oil. A control signal S0 for switching control of the four-way valve 25 is generated corresponding to each mode.

  As shown in FIG. 2, the four-way valve 25 communicates the hydraulic oil flow path 20 into the automatic transmission 11 through the return side end portion 20 b by the control signal S 0 corresponding to the heating mode, and the bypass oil path 23 and The operation mode is switched to a heating mode in which communication with the return side end 20b of the hydraulic oil delivery path 24 is blocked. Further, as shown in FIG. 3, the four-way valve 25 blocks the hydraulic oil passage 20 at the return side end portion 20b and the bypass oil passage 23 at the return side end portion 20b by the control signal S0 corresponding to the steady mode. While being connected, it switches to the steady mode which interrupts | blocks the communication with respect to the return side edge part 20b of the hydraulic oil delivery path 24. Further, as shown in FIG. 4, the four-way valve 25 blocks the hydraulic oil flow path 20 at the return side end 20b by the control signal S0 corresponding to the cooling mode, and the return side end 20b of the bypass oil path 23 is blocked. The communication mode is shut off, and the operation mode is switched to the cooling mode in which the hydraulic oil delivery path 24 is communicated with the return side end portion 20b.

  When the cooling water temperature Tw and the hydraulic oil temperature To are both low and the hydraulic oil cannot be heated by the cooling water as in the cold start of the engine 10, the four-way valve 25 is controlled to a steady mode by the control device 26. The In this steady mode, as shown in FIG. 3, the hydraulic oil introduced from the automatic transmission 11 to the introduction side end 20 a of the hydraulic oil flow path 20 is automatically transmitted from the return side end 20 b via the bypass oil passage 23. Returned to the transmission 11. Therefore, in a state where the hydraulic oil is not heated or cooled at the cold start, the hydraulic oil does not pass through the hydraulic oil passage 20 and the cooling oil passage 13, so that an extra pressure loss is avoided and the oil cooler is avoided. 14. Unnecessary cooling of the hydraulic oil by 14 is prohibited.

  When the coolant temperature Tw rises to a value that can heat the hydraulic oil after the cold start, the four-way valve 25 is switched from the steady mode to the heating mode by the control device 26. In this heating mode, as shown in FIG. 2, the hydraulic oil introduced into the introduction side end 20 a of the hydraulic oil passage 20 passes through the hydraulic oil passage 20 and returns from the return side end 20 b to the automatic transmission 11. Returned to Therefore, in a state where the coolant temperature Tw has increased to a value that can heat the hydraulic oil after the cold start, since the hydraulic oil does not pass through the oil cooler 14 side, an extra pressure loss is avoided and the oil cooler 14 The hydraulic oil is heated by the heat exchanger 12 in a state where unnecessary cooling of the hydraulic oil is prohibited.

  When the hydraulic oil temperature To rises to a value that does not require heating due to the completion of warming of the automatic transmission 11, the four-way valve 25 is switched from the warming mode to the steady mode by the control device 26. In this steady mode, as shown in FIG. 3, the hydraulic oil introduced into the introduction side end 20 a of the hydraulic oil flow path 20 returns to the automatic transmission 11 from the return side end 20 b via the bypass oil path 23. It is. Therefore, in a state where the hydraulic oil is not heated or cooled when the automatic transmission 11 is warmed up, the hydraulic oil does not pass through the hydraulic oil passage 20 and the cooling oil passage 13, so that an extra pressure loss is avoided. At the same time, unnecessary cooling of the hydraulic oil by the oil cooler 14 is prohibited.

  When the load on the engine 10 or the automatic transmission 11 becomes excessive and the hydraulic oil temperature To tends to reach a high temperature region where the lockup control of the automatic transmission 11 is difficult, the four-way valve 25 is controlled by the control device 26 in the steady mode. Can be switched to cooling mode. In this cooling mode, as shown in FIG. 4, the working oil introduced into the introduction side end 20 a of the working oil passage 20 passes through the working oil passage 20 and then passes from the working oil delivery passage 24 to the cooling oil passage. 13 is returned to the automatic transmission 11. Therefore, when the hydraulic oil temperature To is too high, the hydraulic oil is further cooled by the oil cooler 14 after the hydraulic oil is cooled by the cooling water in the heat exchanger 12.

As described above, according to this embodiment, the following effects can be obtained.
(1) In the heat exchanger 12, a bypass oil passage 23 is provided between the introduction side end 20a and the return side end 20b of the hydraulic oil passage 20 to bypass the heat exchange portion 22 and circulate the hydraulic oil. A hydraulic oil delivery path 24 for feeding hydraulic oil from the return side end 20b to the cooling oil path 13 is provided. Further, a four-way valve 25 is provided for switching the communication state of the bypass oil passage 23 and the hydraulic oil delivery passage 24 to the return side end 20b of the hydraulic oil passage 20 to any one of a heating mode, a steady mode and a cooling mode. The valve 25 is controlled to be switched by an external signal.

  For this reason, in the heating mode in which the hydraulic fluid is heated, the hydraulic fluid passes through the hydraulic fluid passage 20 and does not pass through the oil cooler 14 side, thereby avoiding excessive pressure loss and the hydraulic fluid. Heating can be done efficiently. Further, in the steady mode in which the hydraulic oil is neither heated nor cooled, by preventing the hydraulic oil from passing through the bypass oil passage 23 and from the oil cooler 14 side, an extra pressure loss is avoided and the hydraulic oil is prevented from flowing. Unnecessary heating and cooling can be avoided. Further, in the cooling mode for cooling the hydraulic oil, the hydraulic oil can be effectively cooled by passing the hydraulic oil through the hydraulic oil flow path 20 and then the oil cooler 14 side. Therefore, the heat exchanger 12 can constitute an oil temperature control system that has an excellent ability to adjust the temperature of the hydraulic oil while reducing excessive pressure loss of the hydraulic oil. As a result, unnecessary fuel pressure loss of hydraulic oil can be avoided and the fuel efficiency of the vehicle can be improved. Also, unnecessary heating of the hydraulic oil can be avoided and deterioration of the hydraulic oil can be suppressed. Furthermore, the transmission loss of the automatic transmission 11 can be reduced by appropriately controlling the temperature of the hydraulic oil.

  (2) The detour oil path 23 and the hydraulic oil delivery path 24 are connected to one place in the return side end 20b of the hydraulic oil flow path 20, and the return side end 20b is provided by the four-way valve 25 provided in this connection. The communication state between the bypass oil passage 23 and the hydraulic oil delivery passage 24 is switched according to the three modes. Accordingly, the bypass oil passage 23 and the hydraulic oil delivery passage 24 are separately connected to two different positions on the return side end 20b, and the bypass oil passage 23 with respect to the return side end 20b is connected to the return side end 20b by a switching valve provided at each connection portion. Compared with the case where the communication state with the hydraulic oil delivery path 24 is switched, the heat exchanger 12 can be downsized.

(Second Embodiment)
Next, a second embodiment embodying the present invention will be described with reference to FIGS. In this embodiment, the points different from the first embodiment will be mainly described.

  As shown in FIG. 5, in the heat exchanger 12, the connection portion of the bypass oil passage 23 with respect to the return side end portion 20b of the hydraulic oil passage 20 is opened and closed by a control signal S1 of the control device 26. An on-off valve 30 is provided. Further, a second electromagnetic on-off valve 31 that opens and closes by a control signal S2 of the control device 26 is provided downstream of the connection portion of the bypass oil passage 23 at the return side end 20b. The control device 26 generates control signals S1 and S2 for controlling the first electromagnetic on-off valve 30 and the second electromagnetic on-off valve 31, respectively, corresponding to the heating mode, the cooling mode, and the steady mode. In this embodiment, the first electromagnetic on-off valve 30 and the second electromagnetic on-off valve 31 constitute a flow path switching means.

  The first electromagnetic on-off valve 30 and the second electromagnetic on-off valve 31 are controlled to be switched between a closed state and an open state by control signals S1 and S2 corresponding to the heating mode, respectively, as shown in FIG. The communication of the bypass oil passage 23 with respect to 20 b is blocked, and the hydraulic oil passage 20 is communicated with the inside of the automatic transmission 11 through the return side end portion 20 b. Further, the first electromagnetic on / off valve 30 and the second electromagnetic on / off valve 31 are both controlled to be opened by the control signals S1 and S2 corresponding to the steady mode, as shown in FIG. 6, and are operated through the return side end 20b. With the oil passage 20 in communication with the automatic transmission 11, the bypass oil passage 23 is communicated with the return-side end portion 20 b of the hydraulic oil passage 20. Further, the first electromagnetic on-off valve 30 and the second electromagnetic on-off valve 31 are both controlled to be closed by the control signals S1 and S2 corresponding to the cooling mode, as shown in FIG. 7, through the return side end 20b. The communication of the hydraulic oil passage 20 to the inside of the automatic transmission 11 is cut off, and the communication of the bypass oil passage 23 to the return side end portion 20b is cut off.

  Now, when the steady mode is set by the control device 26, both the first electromagnetic on-off valve 30 and the second electromagnetic on-off valve 31 are controlled to be in the open state. In this case, as shown in FIG. 6, the hydraulic oil introduced from the automatic transmission 11 to the introduction side end 20 a of the hydraulic oil passage 20 has a larger hydraulic resistance than the bypass oil passage 23 side. It does not flow to the 20 side, returns to the automatic transmission 11 from the return side end portion 20b through the bypass oil passage 23. As a result, the hydraulic oil is neither heated nor cooled.

  Further, when the heating mode is set by the control device 26 and the first electromagnetic on-off valve 30 is controlled to be in the closed state and the second electromagnetic on-off valve 31 is controlled to be in the open state, as shown in FIG. The hydraulic oil introduced into the side end portion 20a does not flow to the cooling oil passage 13 side where the flow path resistance is larger than that of the return side end portion 20b side, and returns to the automatic transmission 11 from the return side end portion 20b. As a result, the hydraulic oil is heated by the heat exchanger 12.

  Further, when the cooling mode is set by the control device 26 and both the first electromagnetic on-off valve 30 and the second electromagnetic on-off valve 31 are controlled to be in the closed state, as shown in FIG. 7, they are introduced into the introduction side end 20a. The working oil flows to the cooling oil passage 13 side through the working oil passage 20. As a result, the hydraulic oil is cooled by the heat exchanger 12 and the oil cooler 14.

According to this embodiment, the effect described in (1) of the first embodiment can be obtained.
(Other embodiments)
In addition, this embodiment can also be changed and embodied as follows.

  The bypass oil passage 23 and the hydraulic oil delivery passage 24 are separately connected to two different positions on the return side end portion 20b, and a switching valve is provided at each connection portion. Then, each switching valve is controlled to open and close, and the communication state between the bypass oil passage 23 and the hydraulic oil delivery passage 24 with respect to the return-side end portion 20b is switched, so that the heat exchanger 12 is in the heating mode, steady mode, or cooling mode. Configure to switch to.

-The present invention is embodied in a heat exchanger in a torque converter type continuously variable transmission.
(Other technical ideas)
Hereinafter, technical ideas that are grasped from the respective embodiments and are not listed as claims will be described.

  (1) In the heat exchanger according to claim 1, the bypass oil path and the hydraulic oil delivery path are connected to one place at a return side end of the hydraulic oil flow path, and the flow path switching means is A four-way solenoid valve provided in the connecting portion, and in the heating mode, the four-way solenoid valve communicates the hydraulic oil passage into the automatic transmission through a return side end portion and a bypass oil passage and The communication with the return side end of the hydraulic oil delivery path is blocked, and in the steady mode, the hydraulic oil flow path is blocked at the return side end, and the bypass oil path is communicated with the return side end and the hydraulic oil delivery path In the cooling mode, the hydraulic oil flow path is blocked at the return side end, the communication to the return side end of the detour oil path is blocked and the hydraulic oil delivery path is returned. Configured to communicate with the side edges Heat exchanger, characterized in that there.

  (2) In the heat exchanger according to claim 1, the bypass oil path and the hydraulic oil delivery path are connected to one place at a return side end portion of the hydraulic oil flow path, and the flow path switching means is A heat exchanger, comprising: a bypass oil path, and an electromagnetic on-off valve provided on a downstream side of a connection portion between the bypass oil path and the hydraulic oil delivery path at the return side end.

 (3) The heat exchanger according to any one of claims 1 and 1 (1) and (2), and the cooling oil passage connected to the hydraulic oil discharge passage of the heat exchanger. An operating oil temperature control device for an automatic transmission, comprising: an oil cooler; and a control device that controls the flow path switching means based on an operating oil temperature and a cooling water temperature.

  (4) A vehicle comprising the hydraulic oil temperature control device for an automatic transmission according to the technical idea (3).

  DESCRIPTION OF SYMBOLS 10 ... Engine, 11 ... Automatic transmission, 12 ... Heat exchanger, 20 ... Hydraulic oil flow path, 20a ... Introduction side edge part, 20b ... Return side edge part, 21 ... Cooling water flow path, 22 ... Heat exchange part, 23 DESCRIPTION OF SYMBOLS ... Detour oil path, 24 ... Hydraulic oil delivery path, 25 ... Four-way electromagnetic valve as flow path switching means, 30 ... First electromagnetic on-off valve constituting flow path switching means, 31 ... Second electromagnetic on-off valve, S0, S1 , S2: Control signals as external signals.

Claims (1)

A hydraulic oil passage that allows hydraulic fluid supplied from the automatic transmission to pass therethrough and a cooling water passage that allows cooling water supplied from the engine to pass therethrough, and performs heat exchange between the hydraulic oil passage and the cooling water passage. A heat exchange section;
A bypass oil passage communicating the introduction side end portion and the return side end portion of the hydraulic oil passage so as to bypass the heat exchange portion;
A hydraulic oil delivery path branched from the return side end portion toward the outside;
It operates based on an external signal, introduces hydraulic oil into the hydraulic oil flow path from the introduction side end, and communicates the bypass oil path and the hydraulic oil delivery path with respect to the return side end of the hydraulic oil flow path. A heating mode for returning from the return side end portion into the automatic transmission, a steady mode for introducing hydraulic oil from the introduction side end portion into the bypass oil passage and returning from the return side end portion to the automatic transmission, and from the introduction side end portion. A heat exchanger comprising a flow path switching means for switching to a cooling mode in which hydraulic oil is introduced into the hydraulic oil flow path and circulated from the hydraulic oil delivery path to the outside.

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