JP6631365B2 - Hydraulic control device for automatic transmission - Google Patents

Description

  The present invention relates to a hydraulic control device for an automatic transmission that controls an automatic transmission mounted on a vehicle or the like by supplying and discharging hydraulic pressure.

  In recent years, vehicles equipped with a so-called idling stop function for stopping an internal combustion engine when the vehicle is temporarily stopped have been increasing. In addition, an electric oil pump may be mounted in addition to a mechanical oil pump that uses the driving force of an internal combustion engine in order to enhance responsiveness when returning from an engine stopped state. On the other hand, the electric oil pump needs to recharge the battery with the electric power consumed by the electric oil pump after the start of the engine, which hinders the improvement of fuel efficiency. Therefore, the electric oil pump uses a pressure accumulator instead of the electric oil pump. Vehicles have been proposed. As such a pressure storage device, for example, a pressure storage device having a pressure chamber for storing a hydraulic pressure and a solenoid valve capable of controlling discharge of the hydraulic pressure stored in the pressure chamber is known (see Patent Document 1). In the vehicle equipped with the pressure accumulator, the hydraulic pressure can be stored in the pressure chamber when the internal combustion engine is driven, and the hydraulic pressure in the pressure chamber can be supplied to the hydraulic servo of the starting clutch when the internal combustion engine is restarted from a stopped state. .

  Here, when the solenoid valve is released when the internal combustion engine is restarted and the stored hydraulic pressure is supplied to the hydraulic servo of the starting clutch, the solenoid valve is directly communicated with a source of source pressure such as line pressure. If the rotation speed of the internal combustion engine increases and the line pressure becomes larger than the oil pressure stored in the pressure chamber after the solenoid valve is released, the line pressure is stored in the pressure chamber, and as a result, the line pressure is increased. May be lower than the hydraulic pressure required for engaging the starting clutch, and the response of the engaging of the starting clutch may be delayed. For this reason, a pressure accumulator provided with a delay unit for reducing the oil flow speed when accumulating pressure in the pressure chamber has been developed. For example, a non-return valve and an orifice are built in the solenoid valve as a delay part, and oil when accumulating pressure in the accumulator flows through the orifice, while oil when released from the accumulator flows through the check valve. , A delay unit is set. Thus, it is possible to prevent a decrease in responsiveness of engagement of the starting clutch when the internal combustion engine is restarted.

JP-A-2005-078720

  However, when the pressure accumulator described in Patent Document 1 is provided with the above-described delay portion having the check valve and the orifice, since the solenoid valve and the delay portion are integrally formed, for example, the pressure accumulation in the accumulator is performed. When changing the orifice to change the speed, it is necessary to replace the entire solenoid valve, which increases the cost of parts. Further, when increasing the pressure accumulating speed in the accumulator, it is necessary to increase the size of the orifice, so that the size of the solenoid valve is increased and the mountability is reduced.

  Therefore, an object of the present invention is to provide a hydraulic control device for an automatic transmission in which a delay unit that delays the accumulation of pressure in an accumulator can be provided without increasing the size and cost of a solenoid valve.

  A hydraulic control device for an automatic transmission according to the present disclosure includes: a valve body having a hydraulic output unit capable of outputting a hydraulic pressure based on a source pressure obtained by adjusting a hydraulic pressure from a hydraulic pressure source to a transmission mechanism; An accumulator capable of accumulating pressure in the chamber, a solenoid valve capable of opening and closing the pressure chamber of the accumulator, and a connection pipe connecting the valve body and the solenoid valve. The oil flow from the accumulator to the accumulator is slower than the oil flow from the accumulator to the hydraulic pressure source side, and a check valve and an orifice interposed in an oil passage between the hydraulic pressure source and the accumulator. Having a delay unit.

  According to the hydraulic control device for the automatic transmission, the valve body includes the delay portion having the check valve and the orifice. Therefore, as compared with the case where the solenoid valve includes the delay unit, a delay unit that delays the accumulation of pressure in the accumulator can be provided without increasing the size and cost of the solenoid valve.

1 is a schematic side view illustrating a hydraulic control device for an automatic transmission according to an embodiment. 1 is a schematic cross-sectional view illustrating a hydraulic control device for an automatic transmission according to an embodiment. 1 is a schematic hydraulic circuit diagram showing a hydraulic control device for an automatic transmission according to an embodiment.

  Hereinafter, a hydraulic control device for an automatic transmission according to the present embodiment will be described with reference to FIGS. In the present embodiment, the case where the automatic transmission 1 is mounted on a vehicle is described. The automatic transmission 1 according to the present embodiment is provided with an idling stop function. Further, in this embodiment, a vertical direction V (upward direction U and downward direction D) and a horizontal direction H orthogonal to the vertical direction are illustrated in FIGS. 1 and 2, respectively.

  The automatic transmission 1 includes a transmission mechanism 2 that changes the speed of rotation of an internal combustion engine (not shown) and transmits the rotation to wheels, a hydraulic control device 3, an ECU (control unit) 4 (see FIG. 3), and a hydraulic pressure generation source. And a mechanical oil pump (O / P) 5 (see FIG. 3). The transmission mechanism 2 has a plurality of clutches and brakes on the power transmission path from the input shaft to the output shaft as a plurality of frictional engagement elements that are engaged and disengaged by supplying and discharging engagement pressure, in addition to the starting clutch C1. ing. These clutches and brakes can form a plurality of shift speeds by, for example, simultaneously engaging two different combinations. In the present embodiment, a hydraulic control device 3 is attached below the transmission mechanism 2. The mechanical oil pump 5 is driven by an internal combustion engine and can supply a hydraulic pressure for adjusting a line pressure (source pressure) PL.

  The hydraulic control device 3 includes a valve body 30 that supplies oil pressure to the transmission mechanism 2, a pressure accumulator 40 that can accumulate and maintain oil pressure, and a connection pipe 50 that connects the valve body 30 and the pressure accumulator 40. I have.

  As shown in FIG. 1, the valve body 30 is fixed to the mounting portion 21 of the transmission case 20 of the transmission mechanism 2 from below D. The valve body 30 includes an upper body (first body) 31, a lower body (second body) 32, and a separate plate 33 sandwiched between the upper body 31 and the lower body 32. 31, the lower body 32, and the separate plate 33 are stacked and assembled.

  The pressure accumulator 40 and the connecting pipe 50 are fixed to the mounting portion 22 of the transmission case 20 of the transmission mechanism 2 from below D via a bracket 23. The pressure accumulator 40 is disposed adjacent to the valve body 30 in a direction along the separate plate 33. The detailed configuration of the pressure accumulator 40 will be described later.

  The connecting pipe 50 includes a linear vertical portion (first portion) 51 having a vertical direction V as a longitudinal direction and a linear horizontal portion (second portion) orthogonal to the vertical portion 51 and having a horizontal direction H as a longitudinal direction. 52), and is formed in an L-shape as a whole. As shown in FIG. 2, the vertical portion 51 is connected to the mounting hole 32 a formed in the lower body 32 of the valve body 30 via an O-ring 53 by setting the orthogonal direction of the separate plate 33 as a longitudinal direction. That is, the connecting pipe 50 is attached to the valve body 30 in the vertical portion 51 with the direction orthogonal to the separate plate 33 as the oil flow direction. The horizontal portion 52 is orthogonal to the vertical portion 51 and has a direction along the separate plate 33 as a longitudinal direction, and is connected to a solenoid valve 70 (see FIG. 3) of the pressure accumulator 40.

  Here, in the present embodiment, as shown in FIG. 1, the valve body 30 is fixed to the mounting portion 21 of the transmission case 20 from below D, and the pressure accumulator 40 and the connecting pipe 50 are connected to the mounting portion of the transmission case 20. 22 is fixed from below D via a bracket 23. For this reason, there is a possibility that the valve body 30 and the pressure accumulator 40 are attached to the transmission case with an error in the vertical direction V. On the other hand, in the present embodiment, since the vertical portion 51 of the connecting pipe 50 is fitted in the mounting hole 32a of the lower body 32 in the vertical direction, the mounting error in the vertical direction V can be absorbed. Accordingly, it is possible to prevent the occurrence of an attachment error at the connection portion at both ends of the connection pipe 50, and it is possible to suppress leakage of hydraulic pressure at the connection portion.

  Next, a hydraulic circuit of the hydraulic control device 3 of the automatic transmission 1 will be described with reference to FIG.

  The pressure accumulator 40 provided in the hydraulic control device 3 includes an accumulator 60 that can accumulate the line pressure PL in the pressure chamber 61 and a solenoid valve 70 that can open and close the pressure chamber 61 of the accumulator 60. The accumulator 60 includes a housing 62 having an opening 62a, a piston 63 slidable in the housing 62, and a compression coil spring provided between the housing 62 and the piston 63 to bias the piston 63 toward the opening 62a. And a biasing spring 64. The pressure chamber 61 is a space defined by the housing 62 and the piston 63 on the opening 62 a side, and can accumulate hydraulic pressure against the urging spring 64. The solenoid valve 70 has a first port 71 that communicates with the opening 62a of the accumulator, and a second port 72 that communicates with the connecting pipe 50. The first port 71 and the second port 71 communicate with each other by a command from the ECU 4. Of the port 72 is switched.

  The valve body 30 includes a primary regulator valve 37 for adjusting the oil pressure from the mechanical oil pump 5 to a line pressure PL, and a linear solenoid valve supplied with the line pressure PL via a line pressure oil passage (original pressure oil passage) a1. (Hydraulic output unit) SL1 and a delay unit 34 are provided. The linear solenoid valve SL1 is controlled by the ECU 4, generates an engagement pressure PSL1 based on the line pressure PL, and can supply the engagement pressure PSL1 to the hydraulic servo 24 of the starting clutch C1 provided in the transmission mechanism 2. That is, the linear solenoid valve SL1 can output the engagement pressure PSL1 to the transmission mechanism 2 based on the line pressure PL obtained by adjusting the hydraulic pressure from the mechanical oil pump 5.

  The delay part 34 is interposed in the oil passages b1 and b2 between the connecting pipe 50 and the mechanical oil pump 5, and has a check valve 35 and an orifice 36. The check valve 35 is interposed in an oil passage b1 that communicates the connection pipe 50 with the line pressure oil passage a1, and allows oil to flow from the connection pipe 50 to the line pressure oil passage a1, while the line pressure oil passage a1 is provided. It is provided in such a direction as to block the flow of oil from to the connecting pipe 50. The orifice 36 is interposed in an oil passage b2 provided in parallel with an oil passage b1 connecting the connecting pipe 50 and the line pressure oil passage a1.

  Here, as shown in FIG. 2, the check valve 35 includes a cylinder 31a formed inside the upper body 31 and facing the separate plate 33, and an opening 33a formed in the separate plate 33 and communicating with the cylinder 31a. , A communication hole 31b formed in a part of the cylinder 31a and communicating the inside and outside of the cylinder 31a, a piston 35p slidable in a direction orthogonal to the separate plate 33 in the cylinder 31a, and between the cylinder 31a and the piston 35p. And a biasing spring 35s formed of a compression coil spring for biasing the piston 35p toward the opening 33a. The piston 35p is prevented from falling off the cylinder 31a by contacting the separate plate 33. That is, the check valve 35 is provided on the valve body 30 with the direction perpendicular to the separate plate 33 as the stroke direction. Accordingly, when the oil pressure on the lower body 32 side of the opening 33a is larger than the oil pressure on the communication hole 31b side and the urging force of the urging spring 35s, the piston 35p slides, and the oil passage b1 is moved from the opening 33a to the communication hole 31b. The oil is distributed through. On the other hand, the oil in the communication hole 31b does not flow to the opening 33a. The orifice 36 is formed by a hole of the separate plate 33 adjacent to the check valve 35, and communicates the connecting pipe 50 and the mechanical oil pump 5 side (line pressure oil passage a1) by an oil passage b2.

  Accordingly, in the delay section 34, when the oil pressure on the connecting pipe 50 side is higher than the oil pressure on the line pressure oil path a1 side, the oil pressure flows through the oil passage b1 through the check valve 35 at a high speed, and When the oil pressure on the pressure oil passage a1 side is higher than the oil pressure on the connection pipe 50 side, the oil pressure is shut off by the check valve 35 and the oil flows at a low speed through the oil passage b2 via the orifice 36. That is, the delay unit 34 controls the flow of oil from the mechanical oil pump 5 side (line pressure oil passage a1) to the accumulator 60, and the transmission of oil from the accumulator 60 to the mechanical oil pump 5 side (line pressure oil passage a1). It's slower than distribution.

  In the present embodiment, the check valve 35 is arranged to face the opening 50 a of the connecting pipe 50 on the valve body 30 side. As a facing relationship between the check valve 35 and the opening 50a of the connecting pipe 50, it is preferable that the stroke direction of the check valve 35 and the oil flow direction of the vertical portion 51 be substantially parallel, and the stroke direction of the check valve 35 It is more preferable that the center line of the vertical portion 51 is closer to the center line of the vertical portion 51.

  The ECU 4 includes, for example, a CPU, a ROM for storing a processing program, a RAM for temporarily storing data, an input / output port, and a communication port, and includes various signals such as electric signals to the hydraulic control device 3. Is output from the output port. Before the internal combustion engine is stopped by the idle stop, the ECU 4 makes the solenoid valve 70 in the communicating state to accumulate the line pressure PL in the accumulator 60, and when the internal combustion engine is stopped by the idle stop, the solenoid valve 70 is turned off. When the internal combustion engine is restarted, the solenoid valve 70 is opened to release the hydraulic pressure stored in the accumulator 60 when the internal combustion engine is restarted.

  Next, the operation of the above-described hydraulic control device 3 will be described. When the internal combustion engine is driven while the vehicle is running normally, the oil pump is operated by the driving force of the internal combustion engine, and a high line pressure PL is generated. The oil with the line pressure PL passes through the orifice 36 at low speed through the oil passages a1 and b2, and flows through the connecting pipe 50 to the pressure accumulator 40. At this time, the oil of the line pressure PL from the line pressure oil passage a1 flows through the orifice 36 to the connecting pipe 50 side at a low speed without passing through the check valve 35 in the delay portion 34. The ECU 4 keeps the solenoid valve 70 of the pressure accumulator 40 in communication, and the line pressure PL is accumulated in the accumulator 60.

  Next, when the ECU 4 determines that the hydraulic pressure has been accumulated in the accumulator 60, the ECU 4 switches the solenoid valve 70 to the shut-off state. Thus, the state in which the hydraulic pressure is accumulated in accumulator 60 can be maintained. The determination of the accumulated pressure in the accumulator 60 may be made based on, for example, the elapsed time from the previous release of the accumulator 60 while the internal combustion engine is being driven, or other determination methods may be used. After the accumulation of pressure in the accumulator 60 is completed and the solenoid valve 70 is switched to the shut-off state, when the ECU 4 detects that the internal combustion engine is stopped, such as deceleration or stop of the vehicle, the ECU 4 stops the internal combustion engine. .

  Further, when the ECU 4 detects that the restart condition of the internal combustion engine is satisfied, such as depression of an accelerator pedal, the ECU 4 restarts the internal combustion engine and switches the solenoid valve 70 to the communication state. As a result, the hydraulic pressure accumulated in the accumulator 60 is released from the solenoid valve 70 through the connection pipe 50. The released hydraulic pressure passes through the check valve 35 at high speed via the oil passage b1, is supplied to the linear solenoid valve SL1, and is used for engagement of the starting clutch C1.

  As described above, according to the hydraulic control device 3 of the automatic transmission of the present embodiment, the valve body 30 includes the delay portion 34 having the check valve 35 and the orifice 36. Therefore, as compared with the case where the solenoid valve includes the delay unit, the delay unit 34 that delays the accumulation of the pressure in the accumulator 60 can be provided without increasing the size and cost of the solenoid valve 70.

  According to the hydraulic control device 3 of the automatic transmission according to the present embodiment, the orifice 36 is formed on the separate plate 33, and for example, the size of the orifice 36 for changing the pressure accumulation speed to the accumulator 60 is changed. When changing the diameter, it is only necessary to change the diameter of the hole formed in the separate plate 33. For this reason, by providing the orifice in the solenoid valve, it is possible to suppress an increase in component costs as compared with a case where the entire solenoid valve is replaced. Also, when increasing the orifice 36 to increase the speed of accumulating pressure in the accumulator 60, it is sufficient to simply increase the diameter of the hole of the separate plate 33, without increasing the size of parts. For this reason, it is possible to suppress an increase in the size of the valve body 30 as compared with a case where providing the orifice in the solenoid valve causes an increase in the size of the solenoid valve.

  Further, according to the hydraulic control device 3 of the automatic transmission according to the present embodiment, the check valve 35 is disposed to face the opening 50 a of the connecting pipe 50 on the valve body 30 side. For this reason, it is possible to suppress an increase in the bent portion of the oil passage from the connecting pipe 50 to the check valve 35, and to prevent an increase in the pipe resistance when the hydraulic pressure is released from the accumulator 60 when the internal combustion engine is restarted.

  Further, according to the hydraulic control device 3 of the automatic transmission according to the present embodiment, the connecting pipe 50 has the vertical portion 51 and the horizontal portion 52, and is formed in an L-shape as a whole. Since the vertical portion 51 of the connecting pipe 50 is vertically fitted into the mounting hole 32a of the lower body 32, a mounting error in the vertical direction V can be absorbed. Accordingly, it is possible to prevent the occurrence of an attachment error at the connection portion at both ends of the connection pipe 50, and it is possible to suppress leakage of hydraulic pressure at the connection portion.

  In the above-described embodiment, the case where the pressure accumulator 40 is applied to the hydraulic control device 3 of the vehicle equipped with the idling stop function has been described. However, the present invention is not limited thereto. May be applied as a device for supplying hydraulic pressure to the motor.

  Further, in the above-described embodiment, the case where the orifice 36 is formed by the hole of the separate plate 33 has been described, but the present invention is not limited to this. For example, it may be constituted by a hole formed in another plate-shaped member attached to the large diameter hole of the separate plate 33 so as to overlap. In this case, when changing the diameter of the orifice 36, only the other members need be replaced, and it is not necessary to replace the entire separate plate 33, so that the diameter can be changed more easily.

  Further, in the above-described embodiment, the case where the delay unit 34 is interposed between the solenoid valve 70 and the mechanical oil pump 5 has been described, but the present invention is not limited to this. For example, the solenoid valve 70 and each of the ports 71 and 72 may be provided in parallel with each other. In this case, the delay section 34 is formed by connecting the first port 71, the check valve 35, the orifice 36, and the second port 72 in series. Further, the check valve 35 is installed in a direction that allows only the flow of oil from the second port 72 to the first port 71. Also in this case, the delay unit 34 can make the oil flow from the mechanical oil pump 5 to the accumulator 60 slower than the oil flow from the accumulator 60 to the mechanical oil pump 5.

  This embodiment has at least the following configuration. The hydraulic control device (3) of the automatic transmission (1) according to the present embodiment controls the hydraulic pressure (PSL1) based on the source pressure (PL) obtained by adjusting the hydraulic pressure from the hydraulic pressure generation source (5) to the transmission mechanism (2). ), A valve body (30) having a hydraulic output part (SL1), an accumulator (60) capable of accumulating the source pressure (PL) in a pressure chamber (61), and a pressure of the accumulator (60). A solenoid valve (70) capable of opening and closing a chamber (61); and a connecting pipe (50) connecting the valve body (30) and the solenoid valve (70), wherein the valve body (30) comprises: The flow of oil from the hydraulic pressure source (5) to the accumulator (60) is slower than the flow of oil from the accumulator (60) to the hydraulic pressure source (5), and the hydraulic pressure source ( 5) and the a Oil passage has been check valve (35) interposed (b1, b2) and the delay unit having an orifice (36) between the Yumureta (60) comprises a (34). According to this configuration, the valve body (30) includes the delay portion (34) having the check valve (35) and the orifice (36). Therefore, as compared with the case where the solenoid valve (70) includes the delay section (34), the delay section (34) that delays the accumulation of pressure in the accumulator (60) without increasing the size and cost of the solenoid valve (70). ) Can be provided.

  In the hydraulic control device (3) of the automatic transmission (1) according to the present embodiment, the valve body (30) includes a first body (31), a second body (32), And a separate plate (33) sandwiched between the first body (31) and the second body (32). The orifice (36) is formed on the separate plate (33). Then, the connection pipe (50) communicates with the hydraulic pressure source (5). According to this configuration, when changing the size of the orifice (36) in order to change the pressure accumulation speed in the accumulator (60), it is only necessary to change the diameter of the hole formed in the separate plate (33). By providing the orifice (36) in the solenoid valve (70), it is possible to suppress an increase in parts cost as compared with a case where the entire solenoid valve (70) is replaced. When the orifice (36) is enlarged in order to increase the speed of accumulating the pressure in the accumulator (60), the diameter of the hole of the separate plate (33) may be simply increased. The provision of the valve (70) makes it possible to suppress an increase in the size of the hydraulic control device (3), as compared with a case where the solenoid valve (70) is increased in size.

  Further, in the hydraulic control device (3) for the automatic transmission (1) according to the present embodiment, the connecting pipe (50) is arranged so that the direction perpendicular to the separate plate (33) is perpendicular to the valve body (30). The check valve (35) is attached to the valve body (30) with the stroke direction being the direction orthogonal to the separate plate (33). According to this configuration, the check valve (35) can be easily assembled to the valve body (30).

  In the hydraulic control device (3) for the automatic transmission (1) according to the present embodiment, the check valve (35) is configured such that the connection pipe (50) has an opening (50a) on the valve body (30) side. ). According to this configuration, it is possible to suppress an increase in the bent portion of the oil passage from the connection pipe (50) to the check valve (35), and to reduce the oil passage from the accumulator (60) when the internal combustion engine is restarted. Resistance increase can be prevented.

  Further, in the hydraulic control device (3) of the automatic transmission (1) of the present embodiment, the accumulator (60) moves the valve body (30) in a direction along the separate plate (33). The connecting pipe (50) is arranged adjacent to the first portion (51) connected to the valve body (30), the longitudinal direction being a direction perpendicular to the separate plate (33). And a second portion (52) connected to the solenoid valve (70), with a longitudinal direction perpendicular to the portion (51) and along the separate plate (33). . According to this configuration, since the first portion (51) of the connecting pipe (50) is vertically mounted on the valve body (30), a mounting error in the mounting direction can be absorbed. Thereby, it is possible to prevent the occurrence of an attachment error at the connecting portion at both ends of the connecting pipe (50), and it is possible to suppress the leakage of the hydraulic pressure at the connecting portion.

  In the hydraulic control device (3) of the automatic transmission (1) according to the present embodiment, the hydraulic pressure source (5) communicates the hydraulic pressure source (5) with the hydraulic output unit (SL1). The original pressure oil passage (a1). According to this configuration, the delay section (34) controls the flow of oil from the source pressure oil passage (a1) to the accumulator (60) and the flow of oil from the accumulator (60) to the source pressure oil passage (a1). Can also be slow.

DESCRIPTION OF SYMBOLS 1 Automatic transmission 2 Transmission mechanism 3 Hydraulic control device 5 Mechanical oil pump (hydraulic generation source)
30 Valve body 31 Upper body (first body)
32 Lower body (second body)
33 Separate plate 34 Delay part 35 Check valve 36 Orifice 50 Connecting pipe 50a Opening 51 Vertical part (first part)
52 horizontal part (second part)
60 Accumulator 61 Pressure chamber 70 Solenoid valve a1 Line pressure oil passage (source pressure oil passage)
b1 Oil line b2 Oil line PL Line pressure (source pressure)
PSL1 Engagement pressure (hydraulic)
SL1 Linear solenoid valve (hydraulic output unit)

Claims (6)

A valve body having a hydraulic output unit capable of outputting a hydraulic pressure based on a source pressure obtained by adjusting a hydraulic pressure from a hydraulic pressure source to a transmission mechanism;
An accumulator capable of accumulating the source pressure in a pressure chamber;
A solenoid valve capable of opening and closing the pressure chamber of the accumulator,
A connection pipe for connecting the valve body and the solenoid valve,
The valve body slows the flow of oil from the hydraulic pressure source side to the accumulator than the flow of oil from the accumulator to the hydraulic pressure source side, and an oil passage between the hydraulic pressure source and the accumulator. A hydraulic control device for an automatic transmission, comprising a delay portion having a check valve and an orifice interposed therebetween. The valve body is assembled by stacking a first body, a second body, and a separate plate sandwiched between the first body and the second body,
The hydraulic control device for an automatic transmission according to claim 1, wherein the orifice is formed in the separate plate and communicates with the connection pipe and the hydraulic pressure source side. The connection pipe is attached to the valve body with a direction perpendicular to the separate plate as a flow direction of oil,
The hydraulic control device for an automatic transmission according to claim 2, wherein the check valve is provided on the valve body with a direction perpendicular to the separate plate as a stroke direction.   The hydraulic control device for an automatic transmission according to claim 3, wherein the check valve is disposed to face an opening of the connection pipe on the valve body side. The accumulator is disposed adjacent to the valve body in a direction along the separate plate,
The connecting pipe has a longitudinal direction perpendicular to the separate plate, a first portion connected to the valve body, and a longitudinal direction perpendicular to the first portion and along the separate plate, The hydraulic control device for an automatic transmission according to any one of claims 2 to 4, wherein the hydraulic control device has an L-shape including a second portion connected to the solenoid valve. The hydraulic pressure control device for an automatic transmission according to any one of claims 1 to 5, wherein the hydraulic pressure generation source side is a source pressure oil passage that communicates the hydraulic pressure generation source and the hydraulic pressure output unit.

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