JP2010230070A - Hydraulic control device for transmission - Google Patents

Abstract

A transmission hydraulic control device is made compact and an electronic control unit of the hydraulic control device can be cooled satisfactorily.
A hydraulic control device 20 is attached to a valve body 21, an oil pan 60 disposed below the valve body 21, and an oil pan 60 side of the valve body 21, and is used for speed change for driving and controlling a solenoid valve 30. The ECU 41 and the screen 72 for filtering the hydraulic oil flowing in from the oil pan 60 through the hydraulic oil inlet 74o and the valve body 21 and the oil pan 60 can exchange heat between the shifting ECU 41 and the hydraulic oil. A strainer 70 including an oil chamber defining portion 77 having a hydraulic oil outlet 78o defining the hydraulic oil circulation chamber 77c and communicating the hydraulic oil circulation chamber 77c and the oil pan 60, and the hydraulic oil in the oil pan 60 And a pair of fins 80 for promoting the flow of hydraulic oil in the vicinity of the outlet 78o.
[Selection] Figure 2

Description

  The present invention relates to a transmission hydraulic control device that is attached to an automatic transmission and used for shift control of the automatic transmission.

  Conventionally, as a technology in this type of field, an automatic transmission that includes a speed change mechanism, a valve body that forms a hydraulic circuit, a plurality of solenoid valves, and an electronic control device that drives and controls the solenoid valves is known. (For example, refer to Patent Document 1). The valve body of this automatic transmission includes an upper valve body attached to the lower part of the speed change mechanism and a synthetic resin lower valve body. The lower valve body is combined with the oil passage of the upper valve body to change the speed change mechanism. A hydraulic circuit that supplies and discharges hydraulic oil to and from the inlet, an inflow path to which the hydraulic oil cooled by the cooler is supplied, a flow space that communicates with the inflow path and communicates with the strainer, and an operation that connects the strainer and the oil pump. An oil spillway. The electronic control device that drives and controls the solenoid valve is disposed in the flow space of the lower valve body and is cooled by the hydraulic oil cooled by the cooler.

JP 2008-128435 A

  However, when the flow space and strainer are juxtaposed in the axial direction of the automatic transmission, as in the conventional automatic transmission, if the size of the strainer housing is ensured to satisfy the required filtration performance, the corresponding amount is reduced. In order to limit the size of the flow space in the axial direction of the automatic transmission and the degree of freedom of arrangement of each element, and to arrange the electronic control device in the flow space and allow the electronic control device to be cooled well Therefore, it becomes necessary to increase the size of the entire apparatus. From this point, it is not easy to achieve both the cooling performance of the electronic control unit and the compactness of the entire apparatus in the conventional automatic transmission.

  SUMMARY OF THE INVENTION Accordingly, it is a main object of the present invention to make the transmission hydraulic control device compact and to allow the electronic control unit of the transmission hydraulic control device to be cooled satisfactorily.

  The transmission hydraulic control apparatus of the present invention employs the following means in order to achieve the above-mentioned main object.

The transmission hydraulic control device according to the present invention includes:
A hydraulic control device for a transmission which is attached to an automatic transmission and used for shift control of the automatic transmission,
A valve body having a plurality of oil passages;
A solenoid valve incorporated in the valve body;
A hydraulic oil reservoir disposed below the valve body for storing hydraulic oil;
An electronic control unit that is attached to the hydraulic oil storage part side of the valve body and electrically connected to the solenoid valve to drive and control the solenoid valve;
A hydraulic oil inlet that is attached to the valve body and communicates with the hydraulic oil reservoir, a filter medium container that contains a filter medium that filters hydraulic oil flowing from the hydraulic oil inlet, the valve body and the operation The hydraulic oil is extended from the filter medium accommodating section so as to define a hydraulic oil circulation chamber that enables heat exchange between the electronic control unit and the hydraulic oil flowing in from the oil cooler side between the hydraulic reservoir and the hydraulic oil storage section. A strainer including an oil chamber defining portion having a hydraulic oil outlet that communicates the flow chamber and the hydraulic oil storage portion;
A flow promoting mechanism for promoting the flow of hydraulic oil in the vicinity of the hydraulic oil outlet of the hydraulic oil reservoir;
Is provided.

  In this transmission hydraulic control apparatus, an electronic control unit is attached to the hydraulic fluid reservoir of the valve body, and the valve body and hydraulic fluid reservoir are separated by an oil chamber defining portion extending from the strainer accommodating portion of the strainer. A hydraulic fluid circulation chamber is defined that enables heat exchange between the electronic control unit and hydraulic fluid flowing in from the oil cooler side. In this way, by defining the hydraulic fluid circulation chamber using the oil chamber defining portion extended from the filter medium accommodating portion of the strainer, the entire device is made compact, and the space between the valve body and the hydraulic fluid reservoir is reduced. In addition, it is possible to secure a necessary and sufficient hydraulic oil distribution chamber for cooling the electronic control unit by exchanging heat between the electronic control unit and the hydraulic oil, reducing the number of parts and improving the assembly of the equipment. Can be made. Further, in this hydraulic control device, the hydraulic oil circulation chamber is communicated with the hydraulic oil reservoir through the hydraulic oil outlet, and the hydraulic oil that flows into the hydraulic oil circulation chamber and cools the electronic control unit is connected to the hydraulic oil outlet. Then, it flows out to the hydraulic oil reservoir and flows into (is sucked into) the strainer via the hydraulic oil inlet. In this way, if the hydraulic fluid circulation chamber and the strainer are communicated with each other via the hydraulic fluid reservoir, the degree of freedom in arrangement of the hydraulic fluid circulation chamber and the strainer (screen) increases, thereby reducing the overall size of the device. Can be achieved. However, if the hydraulic fluid circulation chamber and the strainer are communicated via the hydraulic fluid reservoir without directly communicating with each other, the hydraulic fluid stays in the hydraulic fluid circulation chamber and the cooling performance of the electronic control unit is impaired. There is also a fear. In view of this, the transmission hydraulic control device is provided with a flow promotion mechanism that promotes the flow of hydraulic oil in the vicinity of the hydraulic oil outlet of the hydraulic oil reservoir. As a result, the pressure of the hydraulic oil in the vicinity of the hydraulic oil outlet is made lower than the pressure of the hydraulic oil on the side opposite to the hydraulic oil inlet side of the hydraulic oil outlet, and the hydraulic oil in the hydraulic oil circulation chamber is stored. It is possible to suck out into the section and guide it to the hydraulic oil inlet of the strainer. As a result, it is possible to prevent the hydraulic oil from staying in the hydraulic oil circulation chamber and to form a flow of hydraulic oil in the hydraulic oil circulation chamber, thereby ensuring good cooling performance of the electronic control unit. Therefore, in this shift hydraulic control device, the entire device can be made compact and the electronic control unit can be cooled well.

  Further, the flow promoting mechanism is provided on the surface near the hydraulic oil outlet and on the hydraulic oil reservoir side of the oil chamber defining portion from the side opposite to the hydraulic oil inlet side of the hydraulic oil outlet. It may be a pair of fins arranged so that the interval becomes narrower toward the hydraulic oil inlet side. That is, in the hydraulic oil reservoir, since a flow of hydraulic oil is normally formed toward the hydraulic oil inlet of the strainer, such a pair of fins is provided in the vicinity of the hydraulic oil outlet and the oil chamber defining part. If the oil is disposed on the surface of the hydraulic oil reservoir, the flow rate of the hydraulic oil in the vicinity of the hydraulic oil outlet of the hydraulic oil reservoir is greater than the flow velocity of the hydraulic oil on the side opposite to the hydraulic oil inlet side of the hydraulic oil outlet. Can also be increased. Therefore, by using such a pair of fins, the pressure of the hydraulic oil in the vicinity of the hydraulic oil outlet of the hydraulic oil reservoir is more easily than the pressure of the hydraulic oil on the side opposite to the hydraulic oil inlet side of the hydraulic oil outlet. Can be reduced. In addition, such a pair of fins has a sufficient pressure reducing effect even if the fins are relatively low in height, and thus does not hinder downsizing of the transmission hydraulic control device.

  Furthermore, the region near the hydraulic oil outlet of the hydraulic oil reservoir is narrowed in the depth direction of the hydraulic oil reservoir compared to the region of the hydraulic oil outlet opposite to the hydraulic oil inlet. May be. This makes it possible to increase the flow rate of the hydraulic oil in the vicinity of the hydraulic oil outlet of the hydraulic oil reservoir without disturbing the downsizing of the hydraulic control device for shifting, and the operation in the vicinity of the hydraulic oil outlet of the hydraulic oil reservoir. The pressure of the oil can be reduced better than the pressure of the hydraulic oil on the side opposite to the hydraulic oil inlet side of the hydraulic oil outlet.

  The transmission hydraulic control apparatus may further include a nozzle that ejects hydraulic oil from the oil cooler side into the hydraulic oil circulation chamber. As a result, the hydraulic oil cooled by the oil cooler can be satisfactorily supplied into the hydraulic oil circulation chamber, and the flow of the hydraulic oil is easily formed in the hydraulic oil circulation chamber.

  The automatic transmission may further include a shift-by-wire electronic control unit that controls a predetermined actuator so that a shift operation according to a shift position selection operation by a driver is realized. The control unit may be attached to the hydraulic oil reservoir of the valve body so as to be adjacent to the electronic control unit in the axial direction of the automatic transmission in the hydraulic oil circulation chamber. In this way, if a plurality of electronic control units are arranged in parallel in the axial direction of the automatic transmission in the hydraulic fluid distribution chamber between the valve body and the hydraulic fluid reservoir, the transmission is controlled while suppressing an increase in dimension in the height direction. It is possible to arrange a plurality of electronic control units with respect to the hydraulic control apparatus, and to cool each electronic control unit satisfactorily.

It is a disassembled perspective view which shows the hydraulic control apparatus 20 for transmissions concerning the Example of this invention. It is sectional drawing which shows the hydraulic control apparatus 20 for transmissions. It is the perspective view which looked at the strainer 70 contained in the hydraulic control apparatus 20 for transmissions from upper direction. It is the perspective view which looked at the strainer 70 contained in the hydraulic control apparatus 20 for transmissions from the downward direction. 6 is a bottom view of the strainer 70. FIG. 3 is an enlarged cross-sectional view of a main part of a transmission hydraulic control device 20. FIG.

  Next, the form for implementing this invention is demonstrated using an Example.

  FIG. 1 is an exploded perspective view showing a transmission hydraulic control device (hereinafter simply referred to as “hydraulic control device”) 20 according to an embodiment of the present invention, and FIG. 2 is a sectional view showing the hydraulic control device 20. is there. A hydraulic control device 20 shown in these drawings is attached to an automatic transmission 10 that transmits power from an engine (not shown) mounted on an automobile to a drive shaft (propeller shaft) and is used for shift control of the automatic transmission 10. It is what

  The hydraulic control device 20 of the embodiment includes a valve body 21 having a plurality of oil passages (not shown), a plurality of solenoid valves 30 that are attached to the valve body 21 and constitute a hydraulic circuit together with the oil passages of the valve body 21, A control module 40 for controlling the entire automatic transmission 10, a switch base 50 for supporting a plurality of hydraulic switches 51, an oil pan 60 as a hydraulic oil reservoir for storing hydraulic oil (ATF), and an oil pump 15 (see FIG. 2) is provided with a strainer 70 and the like for filtering the working oil sucked from the oil pan 60 to remove foreign matters and the like. The valve body 21 that holds the solenoid valve 30 and the like, the control module 40, the switch base 50, and the strainer 70 are integrated and mounted in a housing portion formed in the lower part of the transmission case 12 of the automatic transmission 10, The oil pan 60 attached to the lower part of the case 12 is covered from below.

  The valve body 21 includes an upper half 21a and a lower half 21b. As shown in FIG. 2, the solenoid valve 30 is inserted and the corresponding valve portion of the solenoid valve 30 and the valve body 21 are respectively inserted. A plurality of valve insertion portions 22 for communicating with the oil passages therein, a plurality of hydraulic pressure introduction holes (not shown) communicating with the corresponding hydraulic switches 51, a cylinder insertion portion (not shown) for inserting a parking cylinder, and the like. Is formed. The oil pressure introduction hole is formed in the valve insertion portion 22 for the solenoid valve 30 and at a position where the oil passage needs to be monitored.

  The solenoid valve 30 includes a linear solenoid valve that regulates the hydraulic pressure (line pressure) generated by an oil pump 15 driven by an engine (not shown) and sends it to a plurality of clutches (brakes) (not shown) of the automatic transmission 10. And an on / off solenoid valve for outputting a driving pressure signal to a relay valve (not shown) for switching the supply destination of the hydraulic oil. Each solenoid valve 30 is provided with a valve-side connector (not shown) that is used for electrical connection with the control module 40.

  The control module 40 is a shift electronic control unit (hereinafter referred to as “shift ECU”) 41 that can drive and control the solenoid valve 30 and the like (hydraulic circuit) so that the requested shift state is realized, or by the driver. Shift-by-wire electronic control unit (hereinafter referred to as “SBWECU”) 42 capable of controlling a predetermined actuator (for example, a manual valve driving motor) so as to realize a shift operation in accordance with a shift position selection operation, A flexible printed circuit board (FPC) 43 that enables electrical connection between the ECU 41 and the SBWECU 42 and an external device, a unit base 44 bonded to the flexible printed circuit 43, and the like are included. The control module 40 is fixed to a plurality of bases formed on the valve body 21 via bolts or the like from the solenoid valve 30 side so that the shifting ECU 41 and the SBWECU 42 are adjacent to each other in the axial direction of the automatic transmission 10. .

  The speed change ECU 41 and the SBWECU 42 are circuit boards on which various electronic components are mounted. The flexible wiring board 43 is a flexible deformable wiring material having a thickness of, for example, about 0.1 to 0.2 mm, and is an adhesive to a base film or a base film formed of a resin such as a polyimide resin. It includes a conductor for wiring made of copper foil or the like attached via a layer, a cover film for covering the conductor for wiring, and the like (all not shown). The flexible wiring board 43 is bonded to a circuit board of the speed change ECU 41 or SBWECU 42 with a heat radiation adhesive, and a plurality of bonding terminals formed on the flexible wiring board 43 are connected to the speed change ECU 41 or SBWECU 42 via bonding wires or the like. Are electrically connected. A plurality of connectors 45 (see FIG. 1) that can be coupled to the valve-side connector of the solenoid valve 30 are electrically connected to the end of the flexible wiring board 43. The unit base 44 is made of a low expansion metal having excellent thermal conductivity and a relatively small thermal expansion coefficient, and is bonded to the flexible wiring board 43 from the opposite side of the speed change ECU 41 and the SBWECU 42 via a heat radiation adhesive. . The unit base 44 functions not only as a support for the speed change ECU 41 and the SBWECU 42 but also as a heat sink for dissipating heat. The transmission ECU 41 and the SBWECU 42 are sealed with an epoxy resin or a separate cover, and a part of the flexible wiring board 43 and a part of the unit base 44 are also sealed with the epoxy resin or the like.

  The switch base 50 is a metal plate that supports a plurality of hydraulic switches 51, and is connected to the valve body 21 from the solenoid valve 30 side via bolts or the like so that each hydraulic switch 51 faces a corresponding hydraulic pressure introduction hole. It fixes with respect to the formed several base. Each hydraulic switch 51 communicates with a hydraulic pressure introduction hole formed in the valve body 21 and outputs an ON signal when the hydraulic pressure introduced from the corresponding hydraulic pressure introduction hole exceeds a predetermined threshold value.

  The strainer 70 includes a strainer housing 71 and a screen (filter medium) 72 that is accommodated in the strainer housing 71 and can filter the working oil, and is attached to the valve body 21. The strainer housing 71 includes an upper housing 73 located on the upper side when housed in the transmission case 12 and a lower housing 74 joined to the upper housing 73 and located on the oil pan 60 side.

  As shown in FIGS. 2 and 3, the upper housing 73 defines a substantially rectangular parallelepiped space that accommodates the screen 72 and is connected to the suction port of the oil pump 15 through a predetermined oil passage. A screen accommodating portion 75 having an outlet 75 o and a plate-like oil chamber defining portion 77 extending from the screen accommodating portion 75 are provided. In addition, a nozzle 79 that is connected to the hydraulic oil outlet side of the oil cooler 16 that cools the hydraulic oil through a predetermined oil passage and that opens toward the oil chamber defining portion 77 is fixed to the upper housing 73. . As shown in FIGS. 2 and 4, the lower housing 74 has a relatively shallow dish shape, and covers from the screen housing portion 75 to the middle of the oil chamber defining portion 77 so as to cover the screen in the screen housing portion 75. A space 76 through which hydraulic oil flows is defined between 72 and the inner surface of the oil chamber defining portion 77. Further, the lower housing 74 is formed with a hydraulic oil inlet 74 o that communicates the space 76 with the inside of the oil pan 60. The hydraulic oil inlet 74o is close to the right end in FIG. 2 of the lower housing 74 (the end opposite to the screen housing portion 75 of the upper housing 73) within a range that does not hinder the suction of the hydraulic oil from the oil pan 60. Formed. Further, a lip is formed around the hydraulic oil inlet 74o to suppress air suction.

  The oil chamber defining portion 77 of the upper housing 73 is formed to have a size that can face both the speed change ECU 41 and the SBWECU 42 of the control module 40 and cover the unit base 44. When integrated with the control module 40, it extends in the axial direction of the automatic transmission 10. As shown in FIG. 3, a low side wall 77 w is provided on the outer surface of the surface of the oil chamber defining portion 77, that is, the outer surface of the surface facing the control module 40. Thereby, the oil chamber defining unit 77 cooperates with the flexible wiring board 43 of the valve body 21 and the control module 40 when the strainer 70 is integrated with the valve body 21 and the control module 40. The hydraulic oil circulation chamber 77c is defined that enables heat exchange between the unit base 44 and the hydraulic oil flowing in from the oil cooler 16 through the nozzle 79. In the embodiment, in order to make the hydraulic control device 20 compact, the oil chamber defining portion 77 is formed so that the hydraulic oil circulation chamber 77c is as low as possible within a range where the unit base 44 and the hydraulic oil can sufficiently contact each other. Has been. The side wall 77w formed on the end of the oil chamber defining portion 77 opposite to the screen housing portion 75 has a height that can suppress the outflow of the working oil from the working oil circulation chamber 77c. Preferably formed. Further, a partition wall may be provided in the valve body 21 or the control module 40 in order to suppress the outflow of the hydraulic oil from the hydraulic oil circulation chamber 77c.

  Further, an opening 77o is formed at the end of the oil chamber defining portion 77 opposite to the screen accommodating portion 75. Further, as shown in FIGS. 5 and 6, the rear surface of the end portion on the opening 77 o side of the oil chamber defining portion 77, that is, the surface on the oil pan 60 side is a relatively shallow dish so as not to interfere with the lower housing 74. The oil receiving part 78 which exhibits a shape is joined. The oil receiving portion 78 is formed with a hydraulic oil outlet (communication port) 78o that communicates the inside with the inside of the oil pan 60 so as to be close to the hydraulic oil inlet 74o of the lower housing 74. . By joining such an oil receiving portion 78 to the back surface of the oil chamber defining portion 77, as shown in FIGS. 2 and 6, the region in the vicinity of the hydraulic oil outlet 78o in the oil pan 60 is in the operation state. Compared to the region of the oil outlet 78o opposite to the hydraulic oil inlet 74o side (the right side in FIGS. 2 and 6), the oil outlet 78o is narrowed in the depth direction. In addition, a pair of fins 80 are fixed to the back surface of the end portion on the opening 77 o side of the oil chamber defining portion 77. Each of the fins 80 has a height that protrudes toward the bottom side of the oil pan 60 relative to the oil receiving portion 78, and as shown in FIG. 6, in the vicinity of the hydraulic oil outlet 78 o, that is, the oil receiving portion 78. On both sides, the interval narrows from the side of the hydraulic oil outlet 78o opposite to the hydraulic oil inlet 74o side (the right side in FIGS. 2 and 6) toward the hydraulic oil inlet 74o side (the left side in FIGS. 2 and 6). Placed in.

  Next, the flow of hydraulic oil for cooling the shift ECU 41 and the SBWECU 42 included in the control module 40 of the hydraulic control device 20 will be described.

  When the automatic transmission 10 is operated, the engine connected to the automatic transmission 10 is basically operated to drive the oil pump 15, and the oil pump 15 is sucked from the oil pan 60 and adjusted. The pressurized hydraulic oil is supplied to a hydraulic circuit or the like formed by the oil passage of the valve body 21, the solenoid valve 30, or the like. In addition, although the hydraulic oil whose temperature has increased with the operation of the automatic transmission 10 is cooled by the oil cooler 16, in the hydraulic control device 20 of the embodiment, the hydraulic oil from the oil cooler 16 side is described above via the nozzle 79. Is introduced into the hydraulic fluid circulation chamber 77c. Thereby, in the hydraulic control apparatus 20 of the embodiment, the speed change supported by the unit base 44 by exchanging heat between the hydraulic oil from the oil cooler 16 side and the unit base 44 of the control module 40 in the hydraulic oil circulation chamber 77c. The ECU 41 and the SBWECU 42 can be cooled. The hydraulic oil that has cooled the transmission ECU 41 and the SBWECU 42 in the hydraulic oil circulation chamber 77c flows into the oil pan 60 through the opening 77o, the inside of the oil receiver 78, and the hydraulic oil outlet 78o.

  Here, the hydraulic oil distribution chamber 77c defined by the above-described oil chamber defining unit 77 is low enough to allow the unit base 44 and the hydraulic oil to sufficiently contact with each other, and the hydraulic oil distribution chamber. 77c and the hydraulic oil inlet 74o of the strainer 70 communicate with each other via the oil pan 60 instead of directly. Therefore, if no measures are taken, the hydraulic oil stays in the hydraulic oil circulation chamber 77c and the speed change ECU 41 In addition, the cooling performance of the SBWECU 42 may be impaired. For this reason, in the hydraulic control device 20 of the embodiment, the hydraulic oil outlet 78o is near the hydraulic oil outlet 78o and on the oil pan 60 side surface of the oil chamber defining portion 77 on the side opposite to the hydraulic oil inlet 74o side. A pair of fins 80 is arranged so that the interval becomes narrower toward the hydraulic oil inlet 74o side. Accordingly, the pressure of the hydraulic oil in the vicinity of the hydraulic oil outlet 78o of the oil pan 60 can be made lower than the pressure of the hydraulic oil on the side opposite to the hydraulic oil inlet 74o side of the hydraulic oil outlet 78o. The hydraulic oil in the oil circulation chamber 77c can be sucked out to the oil pan 60 and guided well to the hydraulic oil inlet 74o of the strainer.

  That is, when the oil pump 15 is driven by the engine, the hydraulic oil stored in the oil pan 60 is sucked by the oil pump 15 via the strainer 70, so A flow of hydraulic oil toward the hydraulic oil inlet 74o is formed. Therefore, if the pair of fins 80 as described above is employed, the flow rate of the hydraulic oil in the vicinity of the hydraulic oil outlet 78o of the oil pan 60 is operated on the side opposite to the hydraulic oil inlet 74o side of the hydraulic oil outlet 78o. Therefore, the hydraulic oil pressure in the vicinity of the hydraulic oil outlet 78o of the oil pan 60 is made higher than the hydraulic oil pressure on the side opposite to the hydraulic oil inlet 74o side of the hydraulic oil outlet 78o. Can be easily reduced. Further, in the hydraulic control apparatus 20 of the embodiment, the region near the hydraulic oil outlet 78o of the oil pan 60 is compared with the region on the opposite side of the hydraulic oil outlet 78o from the hydraulic oil inlet 74o side. It is squeezed in the depth direction. As a result, it is possible to further increase the flow rate of the hydraulic oil in the vicinity of the hydraulic oil outlet 78o of the oil pan 60. The pressure of the hydraulic oil on the side opposite to the inlet 74o side can be reduced more favorably.

  As described above, in the hydraulic control device 20 according to the embodiment, the control module 40 including the speed change ECU 41 and the SBWECU 42 is attached to the oil pan 60 side of the valve body 21 and is extended from the screen accommodating portion 75 of the strainer 70. An oil chamber defining chamber 77 between the valve body 21 and the oil pan 60 enables a hydraulic exchange between the unit base 44 (the shifting ECU 41 and the SBWECU 42) and the operating oil from the oil cooler 16 side. 77c is defined. Thus, by defining the hydraulic oil circulation chamber 77c using the oil chamber defining portion 77 extended from the screen accommodating portion 75 of the strainer 70, the valve body 20 and the oil pan are made compact while making the entire apparatus compact. 60, it is possible to secure a necessary and sufficient hydraulic fluid distribution chamber 77c for cooling the gear shifting ECU 41 and the SBWECU 42 by exchanging heat between the arrangement space of the gear shifting ECU 41 and the SBWECU 42 and the hydraulic fluid, and reducing the number of parts. In addition, the assembly of the apparatus can be improved. Further, in the hydraulic control device 20 of the embodiment, the hydraulic oil circulation chamber 77c communicates with the oil pan 60 through the hydraulic oil outlet 78o, and flows into the hydraulic oil circulation chamber 77c to cool the transmission ECU 41 and the SBWECU 42. Flows out to the oil pan 60 through the hydraulic oil outlet 78o and flows (sucked) into the screen 72 of the strainer 70 through the hydraulic oil inlet 74o. In this way, if the hydraulic oil circulation chamber 77c and the strainer 70 are communicated with each other via the inside of the oil pan 60, the degree of freedom in arrangement of the hydraulic oil circulation chamber 77c and the screen 72 of the strainer 70 is increased. The entire apparatus can be made compact. The hydraulic control device 20 of the embodiment is provided with a pair of fins 80 that promote the flow of hydraulic oil in the vicinity of the hydraulic oil outlet 78o of the oil pan 60. As a result, the pressure of the hydraulic oil in the vicinity of the hydraulic oil outlet 78o of the oil pan 60 is made lower than the pressure of the hydraulic oil on the side opposite to the hydraulic oil inlet 74o side of the hydraulic oil outlet 78o. The hydraulic oil in 77c can be sucked out to the oil pan 60 and guided well to the hydraulic oil inlet 74o of the strainer 70. As a result, the hydraulic oil is prevented from staying in the hydraulic oil circulation chamber 77c and a flow of hydraulic oil is formed in the hydraulic oil circulation chamber 77c, thereby ensuring good cooling performance of the speed change ECU 41 and the SBWECU 42. be able to. Therefore, in the hydraulic control apparatus 20 according to the embodiment, the entire apparatus can be made compact and the speed change ECU 41 and the SBWECU 42 can be cooled well.

  Further, if a pair of fins having a sufficient pressure reducing effect even if they are relatively low in height are arranged in the vicinity of the hydraulic oil outlet 78o and on the surface of the oil chamber defining portion 77 on the oil pan 60 side, the hydraulic control is performed. Without hindering the downsizing of the apparatus 20, the flow rate of the hydraulic oil in the vicinity of the hydraulic oil outlet 78o of the oil pan 60 is higher than the flow rate of the hydraulic oil on the side opposite to the hydraulic oil inlet 74o side of the hydraulic oil outlet 78o. The hydraulic oil pressure in the vicinity of the hydraulic oil outlet 78o of the oil pan 60 is thereby increased more easily than the hydraulic oil pressure on the side of the hydraulic oil outlet 78o opposite to the hydraulic oil inlet 74o side. it can. The hydraulic control is performed by narrowing the region near the hydraulic oil outlet 78o of the oil pan 60 in the depth direction of the oil pan 60 compared to the region of the hydraulic oil outlet 78o opposite to the hydraulic oil inlet 74o side. It is possible to further increase the flow rate of the hydraulic oil in the vicinity of the hydraulic oil outlet 78o of the oil pan 60 without hindering the downsizing of the device 20, and the pressure of the hydraulic oil in the vicinity of the hydraulic oil outlet 78o of the oil pan 60 can be increased. The pressure of the hydraulic oil on the side opposite to the hydraulic oil inlet 74o side of the hydraulic oil outlet 78o can be reduced more favorably.

  Furthermore, the working oil cooled by the oil cooler 16 is operated by adopting the nozzle 79 that jets the working oil from the oil cooler 16 side for cooling the working oil to the working oil circulation chamber 77c as in the above embodiment. It becomes possible to satisfactorily supply the oil circulation chamber 77c, and it becomes easier to form a flow of hydraulic oil in the hydraulic oil circulation chamber 77c. If the SBWECU 42 is attached to the oil pan 60 side of the valve body 21 so as to be adjacent in the axial direction of the speed change ECU 41 and the automatic transmission 10 in the hydraulic oil circulation chamber 77c as in the above embodiment, in the height direction. A plurality of electronic control units are arranged for the hydraulic control device 20 while suppressing an increase in size, and the speed change ECU 41 and the SBWECU 42 can be cooled well.

  In addition, although the hydraulic control apparatus 20 of the said Example was demonstrated as what is applied to the automatic transmission 10 mounted in a motor vehicle, it is not restricted to this. That is, the hydraulic control device 20 according to the present invention may be applied to an automatic transmission that is mounted on a device other than an automobile.

  Here, the correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the valve body 21 having a plurality of oil passages corresponds to the “valve body”, and the solenoid valve 30 incorporated in the valve body 21 corresponds to the “solenoid valve” and is disposed below the valve body 21 and operates. An oil pan 60 that stores oil corresponds to a “hydraulic oil storage unit”, is attached to the oil pan 60 side of the valve body 21, and controls the solenoid valve 30 that is electrically connected to the solenoid valve 30. Corresponds to an “electronic control unit” and is attached to the valve body 21 and contains a hydraulic oil inlet 74o communicating with the inside of the oil pan 60 and a screen 72 for filtering the hydraulic oil flowing in from the hydraulic oil inlet 74o. Between the valve housing 21 and the valve body 21 and the oil pan 60. And the hydraulic oil flowing in from the oil cooler 16 side are extended from the screen housing portion 75 so as to define a hydraulic oil circulation chamber 77c that enables heat exchange between the hydraulic oil and the inside of the hydraulic oil circulation chamber 77c and the oil pan 60. A strainer 70 including an oil chamber defining portion 77 having a hydraulic oil outlet 78 o that communicates with each other corresponds to a “strainer”, and a pair of fins that promote the flow of hydraulic oil in the vicinity of the hydraulic oil outlet 78 o in the oil pan 60. 80 corresponds to the “flow promoting mechanism”, and the nozzle 79 that ejects the hydraulic oil from the oil cooler 16 side to the hydraulic oil circulation chamber 77c corresponds to the “nozzle”, and the speed change operation according to the shift position selection operation by the driver. The SBWECU 42 that controls a predetermined actuator so that is realized corresponds to the “shift-by-wire electronic control unit”.

  However, the correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the column of means for solving the problem. Therefore, the elements of the invention described in the column of means for solving the problems are not limited. In other words, the examples are merely specific examples of the invention described in the column for means for solving the problem, and the interpretation of the invention described in the column for means for solving the problem is described in the description of the column. Should be done on the basis.

  The embodiments of the present invention have been described above using the embodiments. However, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the present invention. Needless to say.

  The present invention can be used in the manufacturing industry of transmission hydraulic control devices and automatic transmissions.

  DESCRIPTION OF SYMBOLS 10 Automatic transmission, 12 Transmission case, 15 Oil pump, 16 Oil cooler, 20 Transmission hydraulic control device, 21 Valve body, 21a Upper half, 21b Lower half, 22 Valve insertion part, 30 Solenoid valve, 40 Control module, 41 shift electronic control unit (shift ECU), 42 shift-by-wire electronic control unit (SBWECU), 43 flexible wiring board, 44 unit base, 45 connector, 50 switch base, 51 hydraulic switch, 60 oil pan, 70 Strainer, 71 Strainer Housing, 72 Screen, 73 Upper Housing, 74 Lower Housing, 74o Hydraulic Oil Inlet, 75 Screen Storage Portion, 75o Hydraulic Oil Discharge Port, 76 Space, 77 Oil Chamber Definition, 77c Hydraulic Oil Distribution , 77O opening, 77w sidewalls 78 oil receiving portion, 78O hydraulic oil outlet, 79 a nozzle, 80 fins.

Claims (5)

A hydraulic control device for a transmission which is attached to an automatic transmission and used for shift control of the automatic transmission,
A valve body having a plurality of oil passages;
A solenoid valve incorporated in the valve body;
A hydraulic oil reservoir disposed below the valve body for storing hydraulic oil;
An electronic control unit that is attached to the hydraulic oil storage part side of the valve body and electrically connected to the solenoid valve to drive and control the solenoid valve;
A hydraulic oil inlet that is attached to the valve body and communicates with the hydraulic oil reservoir, a filter medium container that contains a filter medium that filters hydraulic oil flowing from the hydraulic oil inlet, the valve body and the operation The hydraulic oil is extended from the filter medium accommodating section so as to define a hydraulic oil circulation chamber that enables heat exchange between the electronic control unit and the hydraulic oil flowing in from the oil cooler side between the hydraulic reservoir and the hydraulic oil storage section. A strainer including an oil chamber defining portion having a hydraulic oil outlet that communicates the flow chamber and the hydraulic oil storage portion;
A flow promoting mechanism for promoting the flow of hydraulic oil in the vicinity of the hydraulic oil outlet of the hydraulic oil reservoir;
A hydraulic control device for a transmission comprising: The transmission hydraulic control device according to claim 1,
The flow accelerating mechanism is disposed on the surface of the oil chamber defining portion near the hydraulic oil outlet and on the side of the hydraulic oil storage portion from the side opposite to the hydraulic oil inlet side of the hydraulic oil outlet. A transmission hydraulic control device, which is a pair of fins arranged so that the interval decreases toward the inflow port side. The hydraulic control device for a transmission according to claim 1 or 2,
The area near the hydraulic oil outlet of the hydraulic oil reservoir is narrowed in the depth direction of the hydraulic oil reservoir compared to the area of the hydraulic oil outlet opposite to the hydraulic oil inlet side. Hydraulic control device for transmission. The transmission hydraulic control device according to any one of claims 1 to 3,
A transmission hydraulic control device further comprising a nozzle for ejecting hydraulic oil from the oil cooler side into the hydraulic oil circulation chamber. The transmission hydraulic control device according to any one of claims 1 to 4,
The automatic transmission further includes a shift-by-wire electronic control unit that controls a predetermined actuator so that a shift operation according to a shift position selection operation by a driver is realized.
The shift-by-wire electronic control unit is a transmission hydraulic control that is attached to the hydraulic oil storage portion side of the valve body so as to be adjacent to the electronic control unit in the axial direction of the automatic transmission in the hydraulic fluid circulation chamber. apparatus.

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