JP2017180758A - Opening/closing device of pressure accumulation device, and pressure accumulation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an opening/closing device of a pressure accumulation device capable of improving responsiveness of engaging a frictional engagement device upon engine restart, and capable of reducing the capacity of an accumulator, and provide a pressure accumulation device.SOLUTION: An opening/closing device of a pressure accumulation device includes: an insertion hole 44 having a bottom part 44a; an adapter 40 configured to communicate oil pressure between an accumulator body 20 and a hydraulic part, and having oil passages b1, b2 communicating with the insertion hole 44; and a solenoid valve 70 inserted into the insertion hole 44, and capable of switching the oil passages b1, b2 to a communication state or a cut-off state. The adapter 40 includes a drain oil passage 45 communicating with a space 44s between a bottom part 44a of the insertion hole 44 and the solenoid valve 70, and having a discharge port 45a arranged so as to be positioned in oil stored in an oil pan 4.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a pressure accumulator opening / closing device and a pressure accumulator used in a hydraulic control device of an automatic transmission for a vehicle.

  In recent years, an increasing number of vehicles are equipped with a so-called idling stop function for stopping the engine when the vehicle is temporarily stopped. In addition to the mechanical oil pump that uses the driving force of the engine, an electric oil pump may be installed for the purpose of improving responsiveness when returning from the engine stop state. Consume. On the other hand, it replaces with an electric oil pump and the vehicle using the pressure accumulator which does not require electric power is proposed. As such a pressure accumulating device, for example, there is a device having a pressure chamber for storing hydraulic pressure and a control mechanism capable of controlling discharge of the hydraulic pressure stored in the pressure chamber. In a vehicle equipped with a pressure accumulator, the hydraulic pressure is stored in the pressure chamber during engine rotation, while the hydraulic pressure in the pressure chamber is supplied to the hydraulic servo of the starting frictional engagement device when returning from the engine stop state. . As such a pressure accumulator, a spring-type hydraulic accumulator having a housing in which an oil chamber is formed and a solenoid valve capable of opening and closing a hydraulic pressure supply / discharge path from the oil chamber has been proposed ( Patent Document 1).

  In such a pressure accumulating device, generally, a solenoid valve is, for example, a bottomed sleeve inserted into an insertion hole of a housing member, a spool slidably housed inside the sleeve, and a spool provided at the bottom of the sleeve. And a solenoid portion capable of pressing the spool against the biasing spring. If the space between the insertion hole of the receiving member and the bottom of the sleeve is sealed, the sliding of the spool may be resisted by the sealed air, or the hydraulic oil leaking from the solenoid valve cannot be discharged. In general, the bottom of the sleeve is provided with a through hole serving as an air flow passage.

US Patent Application Publication No. 2013/0074967

  Here, in order to avoid sealing the space between the insertion hole of the housing member and the bottom of the sleeve, it is conceivable to provide a drain oil passage in the insertion hole of the housing member that forms the space. However, when the drain oil passage as described above is provided in the pressure accumulator described in Patent Document 1, if the drain oil passage is provided in the atmosphere such as above the oil pan, the spool is hydraulic when the engine is stopped. In the state where is shut off, there is a possibility that the hydraulic oil filled in the oil passage in the hydraulic control device may leak from the solenoid valve due to air being sucked from the drain oil passage. When the hydraulic pressure of the hydraulic servo is reduced when the engine is stopped due to leakage of hydraulic oil due to air suction, the response of engaging the friction engagement device is delayed when the engine is restarted. In addition, leakage of hydraulic oil due to air suction requires a large amount of hydraulic oil to be supplied from the accumulator when the engine is restarted, leading to an increase in the capacity of the accumulator.

  Accordingly, an object of the present invention is to provide a pressure accumulator opening / closing device and a pressure accumulator capable of improving the responsiveness of engaging the friction engagement device when the engine is restarted and reducing the capacity of the accumulator.

  An opening / closing device of a pressure accumulating device according to the present disclosure includes an insertion hole having a bottom, and an oil passage that communicates hydraulic pressure between an accumulator body that can accumulate hydraulic pressure and a hydraulic control unit and communicates with the insertion hole. And a solenoid valve that is provided by being inserted into the insertion hole, and that can switch the oil passage that communicates the accumulator main body and the hydraulic pressure control unit between a communication state and a shut-off state. A drain oil passage that communicates with a space between the bottom portion of the insertion hole and the solenoid valve and has a discharge port that is disposed so as to be positioned in the oil stored in the storage portion.

  In addition, a pressure accumulating device according to the present disclosure is housed in the housing, the housing, the opening and closing device of the pressure accumulating device in which the first port communicates with the hydraulic pressure control unit, and the housing. And the accumulator body coupled to the second port.

  According to the pressure accumulator opening and closing device and the pressure accumulator, the drain port of the drain oil passage communicating with the space between the bottom of the insertion hole and the solenoid valve is disposed so as to be located in the oil stored in the reservoir. Yes. For this reason, unlike the case where the discharge port is open to the atmosphere, air is not sucked from the discharge port, so that it is possible to suppress the leakage of hydraulic oil filled in the oil passage in the hydraulic control unit from the solenoid valve. . As a result, it is possible to improve the responsiveness of engaging the friction engagement device when the engine is restarted, and to reduce the capacity of the accumulator.

The bottom view of the outline of the mission case carrying the pressure accumulator which concerns on embodiment. The schematic front view of the pressure accumulator which concerns on embodiment. The III-III sectional view taken on the line of FIG. 2 of the pressure accumulator which concerns on embodiment. The IV-IV sectional view taken on the line of FIG. 1 of the pressure accumulator which concerns on embodiment. The schematic perspective view which shows the adapter of the pressure accumulator which concerns on embodiment. It is the schematic which shows the principal part of the pressure accumulator which concerns on embodiment, (a) is VIa-VIa sectional view taken on the line of FIG. 2, (b) is VIa-VIb sectional view taken on the line of (a). It is a schematic side view of the mission case carrying the pressure accumulator which concerns on embodiment, (a) is a case where an oil level is horizontal, (b) is a case where an oil level inclines.

  Hereinafter, the pressure accumulator according to the present embodiment will be described with reference to FIGS. In the present embodiment, the case where the pressure accumulator 1 is mounted on an automatic transmission for a vehicle is described. In addition, the vehicle of the present embodiment is assumed to be equipped with an idling stop function. That is, the fuel supply to the engine is stopped when the vehicle is stopped or decelerated while waiting for a signal or the like, while the engine is restarted when the vehicle resumes traveling.

  In a transmission case 2 of an automatic transmission mounted on a vehicle, a transmission mechanism (not shown) that shifts the rotation of the engine and transmits it to the wheels, or a valve body (hydraulic control unit) 3 using the rotation of the engine. An oil pump (not shown) for supplying hydraulic pressure is provided. As shown in FIG. 1, a valve body 3 and a pressure accumulator 1 are arranged at the lower part of the mission case 2 of the present embodiment. The pressure accumulator 1 and the valve body 3 are arranged side by side and covered from below by an oil pan 4 (see FIG. 7A) attached to the lower side of the mission case 2. The oil pump sucks oil stored in the oil pan 4 and supplies hydraulic pressure to an accumulator body 20 (see FIG. 3) and a valve body 3 which will be described later.

  As shown in FIGS. 1 to 3, the pressure accumulator 1 includes a substantially cylindrical bottomed housing 10, an accumulator body 20, and an opening / closing device 30. In the following description, the axial direction of the central axis C1 of the housing 10 is referred to as “axial direction”. Further, the side (upper side in FIG. 1, right side in FIG. 3) on which the opening / closing device 30 is disposed with respect to the housing 10 is referred to as “head side”, and the opposite side in the axial direction is referred to as “bottom side”.

  The housing 10 has a cylindrical shape with a bottom centered on the central axis C1, a body (accumulator housing portion) 11 for housing an accumulator body 20 provided on the bottom portion 11a side having an opening at the center, and the bottom portion 11a in the axial direction. The opening 12 provided on the opposite side, the concave groove 13 formed over the entire circumference on the inner peripheral side of the opening 12, and a notch (through hole) having a shape partially cut away from the opening 12 14. That is, the housing 10 has a notch 14 penetrating inside and outside provided between a pressure chamber 24 and an opening 12 described later of the accumulator body 20. In the present embodiment, the notch 14 is disposed so as to be positioned below the housing 10.

  The housing 10 is arranged with its longitudinal direction along one side of the valve body 3 and is fixed to the main body bracket 5 by welding, for example. Fixing bolts 5a are inserted into a plurality of locations of the main body bracket 5 from below, and the main body bracket 5 and the housing 10 are fixed to the transmission case 2 by these fixing bolts 5a.

  The housing 10 and the valve body 3 are connected by a substantially L-shaped connection pipe 6. The connection pipe 6 is fixed to the bracket 7 by welding, for example. The bracket 7 is disposed so as to overlap with a part of the main body bracket 5, and the main body bracket 5 and the bracket 7 are fastened and fixed to the valve body 3 together with fixing bolts 5 b inserted from below into positions where they overlap.

  The connection pipe 6 is attached to an oil port 3a (see FIG. 4) that opens to the lower surface of the valve body 3. The oil port 3 a communicates with a hydraulic servo of a starting frictional engagement device disposed inside the transmission case 2 via a hydraulic circuit formed in the valve body 3 and the transmission case 2. The starting friction engagement device is, for example, a multi-plate clutch that forms part of a multi-stage transmission mechanism and is engaged at the first forward speed.

  As shown in FIG. 3, the accumulator main body 20 is housed in the body 11 of the housing 10, and is slidable within the housing 10, a biasing spring 21 including a compression coil spring that presses the piston 22, and a piston 22 and an adapter (accommodating portion) 40 that defines the pressure chamber 24 together with the pressure chamber 24.

  The piston 22 is slidably fitted into the body 11 of the housing 10 and defines a pressure chamber 24 together with the bottom surface of the adapter 40 on the axial head side. The piston 22 includes a pressure receiving portion 22a facing the pressure chamber 24 and facing the bottom surface of the adapter 40, and a leg portion 22b having a shape extending from the outer peripheral portion of the pressure receiving portion 22a to the bottom side along the inner peripheral surface of the body 11. Have. The piston 22 has a head side position where the pressure receiving portion 22a hits the adapter 40 (upper half in FIG. 3) and a bottom side position where the leg portion 22b hits the bottom 11a of the housing 10 (lower half in FIG. 3). The volume of the pressure chamber 24 is changed by sliding between them. A composite seal 25 for sealing the pressure chamber 24 is attached to the outer peripheral surface of the pressure receiving portion 22a. The urging spring 21 is provided between the pressure receiving portion 22a and the bottom portion 11a of the housing 10, and urges the piston 22 toward the pressure chamber 24 side.

  The adapter 40 has a substantially cylindrical shape and is fitted to the head side inside the housing 10. The adapter 40 has a stepped portion 41 having an enlarged diameter on the head side in the axial direction and a claw portion 42 (see FIG. 6A) protruding to the outer peripheral side. The step portion 41 abuts on a snap ring 26 attached to the concave groove 13 formed on the inner peripheral side of the opening 12 of the housing 10 and is restricted from moving toward the head side in the axial direction. Further, the claw portion 42 is engaged with a notch 14 (see FIG. 6A) formed in a part of the housing 10 on the axial head portion side, and the circumferential direction between the housing 10 and the adapter 40 is engaged. Alignment is made. The bottom surface of the adapter 40 forms a cylinder surface of the pressure chamber 24 together with the inner peripheral surface of the housing 10, and an O-ring o4 that seals the pressure chamber 24 is attached to the outer peripheral surface of the adapter 40. In the present embodiment, a gap 15 is provided between the outer peripheral surface of the adapter 40 and the inner peripheral surface of the housing 10 between the O-ring o4 and the snap ring 26. That is, the adapter 40 is provided with the outer peripheral surface in close contact with the inner peripheral surface of the housing 10 on the bottom 11 a side and the opening 12 side of the housing 10.

  As shown in FIG. 4, the adapter 40 is formed with a supply / discharge port 43 that opens in a direction orthogonal to the axial direction, and the connection pipe 6 is attached to the supply / discharge port 43. The connection pipe 6 is formed to have an outer diameter slightly smaller than the inner diameter of the supply / discharge port 43 and is inserted into the supply / discharge port 43 with an O-ring o5 fitted in an annular groove formed on the outer peripheral surface. ing. The connection pipe 6 extends from the supply / discharge port 43 to the outside of the housing 10, bends substantially at a right angle, and extends toward the oil port 3 a that opens at the lower surface of the valve body 3. It is attached to 3a.

  As shown in FIG. 5, the adapter 40 has an insertion hole 44 in which the opening / closing device 30 described later is provided. The insertion hole 44 is provided along the axial direction and has a bottom portion 44a (see FIG. 6A). A first annular oil passage b1, a second annular oil passage b2, a first oil passage a1, and a second oil passage a2 are communicated with the insertion hole 44. The first annular oil passage b1 and the second annular oil passage b2 are formed in an annular shape on the inner peripheral surface of the insertion hole 44, and the first annular oil passage b1 is disposed closer to the head than the second annular oil passage b2. (See FIG. 3). The first oil passage a1 communicates the supply / discharge port 43 and the first annular oil passage b1, and the second oil passage a2 communicates the pressure chamber 24 and the second annular oil passage b2. Accordingly, the supply / exhaust port 43 and the pressure chamber 24 are arranged from the supply / exhaust port 43 side to the first oil passage a1, the first annular oil passage b1, the insertion hole 44, the second annular oil passage b2, and the second oil passage a2. Are communicated by routes arranged in this order. That is, the adapter 40 includes oil passages a 1, b 1, b 2, and a 2 that communicate with the insertion hole 44 while communicating with the hydraulic pressure between the accumulator body 20 and the valve body 3 that can accumulate the hydraulic pressure.

  In the present embodiment, as shown in FIGS. 4 and 5, the insertion hole 44 is formed offset from the center of the adapter 40 when viewed in the axial direction. The first oil passage a <b> 1, the second oil passage a <b> 2, and the supply / discharge port 43 are formed using a space on the adapter 40 opposite to the offset direction of the insertion hole 44. The first oil passage a1 and the supply / discharge port 43 are formed in a direction orthogonal to the axial direction, while the second oil passage a2 connects the pressure chamber 24 and the second annular oil passage b2 along the axial direction. Yes.

  Next, the opening / closing device 30 includes an adapter 40 and a solenoid valve 70 as shown in FIGS. 3 and 6A. The solenoid valve 70 includes a solenoid portion 31, a sleeve 51, an inner sleeve 55, and a spool 60. The solenoid valve 70 is inserted into the insertion hole 44 of the adapter 40 so that the opening / closing device 30 is assembled.

  A connector 32 is provided on a part of the outer periphery of the solenoid unit 31, and the solenoid unit 31 is connected to an electronic control unit (not shown) and a vehicle battery via the connector 32. The solenoid unit 31 can slide the spool 60 when energized. The solenoid part 31 is provided with the central axis C2 substantially parallel to the axial direction of the central axis C1 of the housing 10. As shown in FIG. 2, a bracket 33 that extends in a V shape when viewed in the axial direction is fixed to the solenoid portion 31, and the solenoid portion 31 is fixed to the adapter 40 by a fixing bolt 34 inserted through the bracket 33. Yes. The solenoid unit 31 includes a coil 35, a plunger 36, a rod 37, and the like. When the coil 35 is energized and controlled by the electronic control unit via the connector 32, the plunger 36 slides toward the spool 60, The rod 37 is pushed out against an urging spring 38 described later.

  The sleeve 51 has a bottomed cylindrical shape with the solenoid part 31 open and has a bottom part 52 facing the bottom part 44a, a first port 53, and a second port 54. The hole 44 is provided by being inserted with the release port 51a side toward the bottom 44a. The bottom portion 52 is provided with a release port 52a. The first port 53 communicates the inside and outside of the sleeve 51 and is connected to the valve body 3 via the connection pipe 6 from the first annular oil passage b1 and the first oil passage a1. The second port 54 communicates the inside and outside of the sleeve 51 and is connected to the accumulator body 20 via the second annular oil passage b2 and the second oil passage a2. The inner sleeve 55 is provided on the inner peripheral side of the sleeve 51 by fitting on the solenoid portion 31 side of the sleeve 51.

  The spool 60 has a first land portion 61, a second land portion 62, and a third land portion 63. The spool 60 is urged toward the solenoid portion 31 by an urging spring 38 formed of a compression coil spring provided between the bottom portion 52 of the sleeve 51.

  The first land portion 61 can be positioned between the first port 53 and the bottom portion 44 a and is disposed at the end portion of the spool 60 on the bottom portion 44 a side. On the outer peripheral surface of the first land portion 61, a first seal member o1 that is in sliding contact with the inner peripheral surface of the sleeve 51 is provided. That is, the first seal member o1 is provided between the sleeve 51 and the first land portion 61.

  The second land portion 62 is disposed on the spool 60 on the side opposite to the bottom portion 44 a with respect to the first land portion 61. On the inner peripheral surface of the sleeve 51, a second seal member o2 that is in sliding contact with the outer peripheral surface of the second land portion 62 is provided. The second seal member o2 has a higher sealing performance than the first seal member o1. That is, the second seal member o2 has a higher sealing performance than the first seal member o1, and is provided between the sleeve 51 and the second land portion 62. Thereby, since the 2nd sealing member o2 has high sealing performance, it can control that hydraulic fluid leaks out to the solenoid part 31 side, and the foreign material mixed in hydraulic fluid penetrates into solenoid part 31. Can be prevented. Further, since the first sealing member o1 can be made smaller than the second sealing member o2, the opening / closing device 30 can be reduced in size.

  The third land portion 63 is provided between the first land portion 61 and the second land portion 62, that is, between the first port 53 and the second port 54. The third land portion 63 can be contacted / separated in the axial direction with respect to the inner sleeve 55, and is brought into a shut-off state in which the first port 53 and the second port 54 are shut off by contacting the third land portion 63. The first port 53 and the second port 54 communicate with each other. That is, the spool 60 is slidably accommodated in the insertion hole 44 of the adapter 40, and the first port 53 and the bottom portion which are the ports closer to the bottom portion 44a of the first port 53 and the second port 54. A first land portion 61 that can be positioned between the first port 53 and the first port 53 and the second port 54 by sliding, and a first port 53 and a second port. The opening / closing device 30 can be switched to a shut-off state in which 54 is shut off. That is, the solenoid valve 70 is provided by being inserted into the insertion hole 44, and the oil passages a1, b1, b2, and a2 that connect the accumulator body 20 and the valve body 3 can be switched between a communication state and a blocking state. As a result, when the opening / closing device 30 is in communication and the hydraulic pressure of the first annular oil passage b1 is higher than the hydraulic pressure of the second annular oil passage b2, the working oil flows from the first annular oil passage b1 to the second annular oil passage b2. And is movable.

  A third seal member (sleeve outer seal member) o <b> 3 is provided on the outer peripheral surface of the sleeve 51 on the bottom 52 side so as to be in sliding contact with the inner peripheral surface of the insertion hole 44. Thereby, it can prevent that the oil_pressure | hydraulic of the 1st port 53 and the 1st annular oil path b1 leaks to the bottom part 44a. That is, the third seal member o3 includes the first port 53 closer to the bottom 44a of the first port 53 and the second port 54 on the outer peripheral surface of the sleeve 51, and the release port 52a of the sleeve 51. And the end portion on the side.

  Next, the drain oil passage 45 that is a characteristic configuration of the pressure accumulator 1 will be described. A space 44 s is provided between the bottom 44 a and the bottom 52 of the sleeve 51 in the insertion hole 44 of the adapter 40. The adapter 40 is formed with a drain oil passage 45 communicating with the space 44 s and the outside below the adapter 40. That is, the drain oil passage 45 is formed in the adapter 40 and communicates the space 44 s between the bottom portion 44 a of the insertion hole 44 and the sleeve 51 and the outside of the adapter 40. The drain oil passage 45 is provided so that the hydraulic oil pushed out by sliding of the spool 60 is released to the gap 15 between the housing 10 and the adapter 40.

  The drain oil passage 45 has a discharge port 45 a on the outer peripheral surface of the adapter 40. The discharge port 45 a is open below the spool 60. In the present embodiment, the discharge port 45a is open downward. Further, the discharge port 45a of the drain oil passage 45 opens into a gap 15 formed between the adapter 40 and the housing 10, and the discharge port 45a, the gap 15 and the notch 14 communicate with each other. In the present embodiment, since both the discharge port 45a and the notch 14 are opened directly below, the hydraulic oil discharged from the discharge port 45a flows through the inside of the housing 10 and falls from the notch 14, It is dropped on the oil pan 4.

  As shown to Fig.7 (a), the discharge port 45a is arrange | positioned so that it may be located below the oil level 8 of the oil stored by the oil pan (storage part) 4, ie, in oil. Further, as shown in FIG. 7B, the discharge port 45a is disposed so as to be located in the oil when the inclination angle of the oil surface 8 is within a predetermined range (for example, within ± 10 °). Yes. In the present embodiment, as shown in FIG. 7B, the discharge port 45 a can be positioned below the oil surface 8 even when the road surface is an 8 ° downhill. That is, the drain oil passage 45 is communicated between the bottom portion 44a and the first land portion 61, drains oil leaked from the sliding contact portion between the sleeve 51 and the first land portion 61, and stores the oil. When the inclination angle of the oil surface 8 of the oil pan 4 is within a predetermined range, the oil pan 4 has a discharge port 45a disposed so as to be located in the oil. In the present embodiment, the notch 14 is also arranged so as to be located in the oil when the inclination angle of the oil surface 8 of the oil pan 4 is within a predetermined range.

  Next, the operation of the above-described pressure accumulator 1 will be described. When the vehicle is traveling normally and the engine is rotating, the oil pump is operated by the driving force of the engine. Then, the hydraulic pressure pressurized by the oil pump and regulated in the valve body 3 is supplied from the oil port 3 a to the supply / discharge port 43 of the pressure accumulator 1. At this time, the switchgear 30 is in communication with a signal from the electronic control unit. For this reason, when the supply hydraulic pressure supplied to the supply / discharge port 43 is higher than the internal pressure of the pressure chamber 24, the hydraulic oil on the supply / discharge port 43 side passes through the opening / closing device 30 and moves to the pressure chamber 24 side. . The piston 22 slides toward the bottom portion 11a against the biasing force of a biasing spring (not shown), the hydraulic oil is accumulated in the pressure chamber 24, and the internal pressure in the pressure chamber 24 is changed to the supply hydraulic pressure. Ascend to approach.

  When the electronic control unit detects an engine stop condition such as deceleration or stop of the vehicle, the electronic control unit starts the engine stop process and keeps the opening / closing device 30 in a shut-off state. Then, the oil pump is stopped by stopping the rotation of the engine, and the hydraulic pressure supply to the valve body 3 is stopped. However, the movement of the hydraulic oil from the pressure chamber 24 to the supply / discharge port 43 is restricted by the opening / closing device 30. The internal pressure of the pressure chamber 24 is maintained.

  When the electronic control unit detects the restart condition of the engine, such as the release of the brake pedal by the driver, the electronic control unit starts the engine restart process and sends a signal to the switching device 30 to change from the shut-off state to the communication state. And switch. Then, the piston 22 slides to the head side by the urging force of the urging spring, and the hydraulic oil in the pressure chamber 24 passes through the opening / closing device 30 and is discharged from the supply / discharge port 43 to be supplied to the oil port 3a. . Then, the hydraulic pressure is supplied to the starting frictional engagement device inside the transmission case 2 via the hydraulic circuit of the valve body 3 and the transmission case 2. Then, the starting frictional engagement device is actuated to transmit the driving force of the engine to the driving wheels, and the vehicle starts to accelerate. Further, since the oil pump resumes operation as the engine is restarted and starts to supply hydraulic pressure to the valve body 3, the hydraulic pressure supplied to the supply / discharge port 43 of the pressure accumulator 1 increases, and the hydraulic pressure to the pressure chamber 24 increases. Accumulation resumes.

  As a result, the hydraulic control device having the pressure accumulating device 1 can return the vehicle from the engine stop state to the normal running more quickly than the hydraulic control device that waits for the operation of the oil pump to operate the starting hydraulic device.

  Here, the discharge port 45 a of the drain oil passage 45 is arranged so as to be located in the oil stored in the oil pan 4. For this reason, since air is not inhaled from the discharge port 45a, the hydraulic oil filled in the oil passage in the valve body 3 is prevented from leaking from the solenoid valve 70. Further, the discharge port 45a is disposed so as to be located in the oil stored in the oil pan 4 when the inclination angle of the oil surface 8 of the oil pan 4 is within a predetermined range. For this reason, even when the vehicle on which the pressure accumulator 1 is mounted is accelerated or decelerated or inclined and the oil level 8 is inclined, air is not sucked from the discharge port 45a, so that the solenoid valve 70 enters the oil passage in the valve body 3. It is suppressed that the filled hydraulic fluid leaks out.

  As described above, according to the pressure accumulating device 1 of the present embodiment, the discharge port 45 a of the drain oil passage 45 communicating with the space between the bottom 44 a of the insertion hole 44 and the solenoid valve 70 is stored in the oil pan 4. It is arranged to be located in the oil. For this reason, unlike the case where the discharge port 45a is opened to the atmosphere, air is not sucked from the discharge port 45a, so that the hydraulic oil filled in the oil passage in the valve body 3 leaks from the solenoid valve 70. This can be suppressed. As a result, the responsiveness of engaging the starting frictional engagement device when the engine is restarted can be improved, and the capacity of the accumulator body 20 can be reduced.

  Further, according to the pressure accumulator 1 of the present embodiment, the discharge port 45a is located in the oil stored in the oil pan 4 when the inclination angle of the oil surface 8 of the oil pan 4 is within a predetermined range. Is arranged. For this reason, even when the vehicle on which the pressure accumulator 1 is mounted is accelerated or decelerated or inclined and the oil level 8 is inclined, air is not sucked from the discharge port 45a, so that the solenoid valve 70 enters the oil passage in the valve body 3. It is possible to suppress leakage of the filled hydraulic fluid. As a result, the responsiveness of engaging the starting frictional engagement device when the engine is restarted can be improved, and the capacity of the accumulator body 20 can be reduced.

  In the above-described embodiment, the case where the pressure accumulator 1 is applied to a hydraulic control circuit for a vehicle equipped with an idling stop function has been described. However, the present invention is not limited to this, and the hydraulic pressure control circuit 1 is used when the oil pump is not operating. You may apply as an apparatus which supplies hydraulic pressure.

  In the above-described embodiment, the case where the multi-plate clutch engaged at the first forward speed of the speed change mechanism is used as the starting friction engagement device, but is not limited thereto. For example, it may be another friction engagement device that operates when starting, or is not limited to a friction engagement device that constitutes a part of a multi-stage transmission mechanism, and for example, presses a pulley of a belt-type continuously variable transmission mechanism The hydraulic servo to be driven may be hydraulically driven by a pressure accumulator.

  Moreover, although embodiment mentioned above demonstrated the case where the sleeve 51 and the adapter 40 were separate bodies, it is not restricted to this, For example, the sleeve 51 may be integrated with the adapter 40.

  Moreover, although embodiment mentioned above demonstrated the case where the switchgear 30 and the accumulator main body 20 were built in the pressure accumulator 1, it is not restricted to this. For example, the opening / closing device 30 may be provided separately from the accumulator body 20. In this case, for example, the opening / closing device 30 may be disposed integrally with the valve body 3 and the accumulator body 20 may be disposed separately from the valve body 3.

  The present embodiment includes at least the following configuration. The opening / closing device (30) of the pressure accumulating device (1) of the present embodiment is provided between an insertion hole (44) having a bottom (44a), an accumulator body (20) capable of accumulating hydraulic pressure, and a hydraulic pressure control unit (3). And an accommodating portion (40) having an oil passage communicating with the insertion hole (44) and being inserted into the insertion hole (44). The accumulator body (20) and the hydraulic pressure are provided. A solenoid valve (70) capable of switching the oil passage communicating with the control unit (3) between a communication state and a shut-off state, and the storage unit (40) is configured so that the bottom portion of the insertion hole (44) ( 44a) and a drain oil passage that communicates with the space (44s) between the solenoid valve (70) and has a discharge port (45a) disposed so as to be located in the oil stored in the storage section (4). (45). According to this configuration, the drain port (45a) of the drain oil passage (45) communicating with the space (44s) between the bottom portion (44a) of the insertion hole (44) and the solenoid valve (70) serves as the storage portion (4 ) Is located in the oil stored. For this reason, unlike the case where the discharge port (45a) is opened to the atmosphere, air is not sucked from the discharge port (45a), so that the oil passage in the hydraulic control unit (3) is filled from the solenoid valve (70). It can suppress that the used hydraulic fluid leaks out. Thereby, while being able to improve the responsiveness which engages a friction engagement apparatus at the time of engine restart, reduction of the capacity | capacitance of an accumulator main body (20) can be aimed at.

  In the opening / closing device (30) of the pressure accumulator (1) of the present embodiment, the discharge port (45a) of the drain oil passage (45) opens below the solenoid valve (70). According to this configuration, since the discharge port (45a) can be easily disposed below the oil level (8), leakage of hydraulic oil between the solenoid valve (70) and the hydraulic control unit (3) is reliably suppressed. can do.

  In the opening / closing device (30) of the pressure accumulator (1) of the present embodiment, the solenoid valve (70) includes the first port (53) connected to the hydraulic pressure control unit (3) and the accumulator. A sleeve (51) having a second port (54) coupled to the main body (20), and slidably received in the sleeve (51), the first port (53) and the second port A spool (60) having a first land portion (61) located between the port (53) and the bottom portion (44a) closer to the bottom portion (44a) of the port (54) of By sliding the spool (60) by switching between an on state and an off state, a communication state in which the first port (53) and the second port (54) communicate with each other, and the first port ( 53) and the second paw A solenoid unit for switching to a cut-off state in which the (54) and (31), the. According to this configuration, even when the vehicle on which the pressure accumulating device (1) is mounted is accelerated or decelerated or inclined and the oil level (8) is inclined, the oil in the hydraulic control unit (3) is supplied from the solenoid valve (70). The hydraulic oil filled in the road can be prevented from leaking, the responsiveness to engage the friction engagement device when the engine is restarted can be improved, and the capacity of the accumulator body (20) can be reduced. .

  Further, in the opening / closing device (30) of the pressure accumulator (1) of the present embodiment, the first land portion (61) is disposed at the end portion on the bottom portion (44a) side of the spool (60), A first seal member (o1) is provided between the sleeve (51) and the first land portion (61), and the spool (60) is in contact with the first land portion (61). The first seal member has a second land portion (62) disposed on the opposite side of the bottom portion (44a), and is interposed between the sleeve (51) and the second land portion (62). A second sealing member (o2) having a higher sealing property than (o1) is provided. According to this configuration, since the second seal member (o2) has high sealing performance, it is possible to suppress the hydraulic oil from leaking to the solenoid part (31) side, and foreign matters mixed in the hydraulic oil can be prevented. Intrusion to the solenoid part (31) can be prevented. Moreover, since the first sealing member (o1) can be made smaller than the second sealing member (o2), the opening / closing device (30) can be reduced in size.

  Further, in the opening / closing device (30) of the pressure accumulator (1) of the present embodiment, the accommodating portion (40), the sleeve (51) is accommodated in the insertion hole (44), and the bottom portion (44a). The drain oil passage (45) has a space (44s) between the bottom (44a) of the insertion hole (44) and the sleeve (51). The outside of the housing part (40) communicates with the outside. According to this configuration, the opening / closing device (30) can be assembled by inserting the sleeve (51), which is a part of the solenoid valve (70), into the insertion hole (44) of the housing portion (40). The manufacturing process can be simplified and the cost can be reduced.

  Further, in the opening / closing device (30) of the pressure accumulator (1) of the present embodiment, on the outer peripheral surface of the sleeve (51), of the first port (53) and the second port (54). A sleeve outer seal member (o3) is provided between the port (53) closer to the bottom (44a) and the end of the sleeve (51) on the release port (52a) side. According to this configuration, oil tightness between the sleeve (51) and the insertion hole (44) can be ensured.

  The pressure accumulating device (1) of the present embodiment is housed in the housing (10) and the housing (10), and the first port (53) is communicated with the hydraulic pressure control unit (3). The opening / closing device (30), and the accumulator body (20) connected to the second port (54) while being accommodated in the housing (10). According to this configuration, it is possible to obtain the pressure accumulator (1) that can reduce oil leakage from the periphery of the spool (60) without using a large seal member.

  Further, in the pressure accumulator (1) of the present embodiment, the housing (10) has a bottomed cylindrical shape, and an accumulator accommodating portion (11) that accommodates the accumulator main body (20) provided on the bottom (11a) side. ), An opening (12), and a through-hole (14) penetrating the inside and outside provided between the pressure chamber (24) of the accumulator body (20) and the opening (12), The housing portion (40) is provided on the bottom (11a) side and the opening (12) side of the housing (10) with the outer peripheral surface thereof being in close contact with the inner peripheral surface of the housing (10). A discharge port (45a) of the oil passage (45) opens into a gap (15) formed between the housing portion (40) and the housing (10), and a discharge port of the drain oil passage (45). (45a) and the gap (45) and the penetration (14) communicates, and the through hole (14) is positioned below the oil level (8) when the inclination angle of the oil level (8) of the reservoir (4) is within a predetermined range. To be arranged. According to this configuration, oil leakage from between the first land portion (61) and the storage portion (40) of the spool (60) can be reduced, and the friction engagement device is engaged when the engine is restarted. It is possible to improve the responsiveness to be combined, and to reduce the capacity of the accumulator body (20).

1 Accumulator 3 Valve body (hydraulic control part)
4 Oil pan (storage part)
10 Housing 11 Body (Accumulator housing)
11a bottom 12 opening 14 notch (through hole)
15 Clearance 20 Accumulator body 24 Pressure chamber 30 Opening / closing device 31 Solenoid part 40 Adapter (housing part)
44 Insertion hole 44a Bottom 44s Space 45 Drain oil passage 45a Discharge port 51 Sleeve 52a Release port 53 First port 54 Second port 60 Spool 70 Solenoid valve 61 First land portion 62 Second land portion o1 First Seal member o2 Second seal member o3 Third seal member (sleeve outer seal member)

Claims (8)

An accommodating portion having an insertion hole having a bottom portion, and an oil passage communicating with the insertion hole while communicating with the hydraulic pressure between an accumulator body capable of accumulating hydraulic pressure and the hydraulic control unit;
A solenoid valve provided to be inserted into the insertion hole and capable of switching the oil passage communicating the accumulator main body and the hydraulic control unit between a communication state and a shut-off state;
The storage portion communicates with a space between the bottom portion of the insertion hole and the solenoid valve, and includes a drain oil passage having a drain oil passage disposed so as to be positioned in the oil stored in the storage portion. The switchgear of the device.   2. The pressure accumulator opening and closing device according to claim 1, wherein the discharge port of the drain oil passage opens below the solenoid valve. The solenoid valve is
A sleeve having a first port coupled to the hydraulic control unit and a second port coupled to the accumulator body;
A spool having a first land portion that is slidably accommodated in the sleeve and is positioned between the bottom portion of the first port and the second port that is closer to the bottom portion; ,
By sliding the spool by switching between an on state and an off state, a communication state in which the first port and the second port are communicated with each other, and a blocking in which the first port and the second port are blocked The opening / closing device for a pressure accumulator according to claim 1, further comprising: a solenoid portion that switches to a state. The first land portion is disposed at an end of the spool on the bottom side, and a first seal member is provided between the sleeve and the first land portion.
The spool has a second land portion disposed on the opposite side of the bottom portion with respect to the first land portion, and the first seal is interposed between the sleeve and the second land portion. The pressure accumulator opening and closing device according to claim 3, wherein a second seal member having a higher sealing property than the member is provided. The sleeve is accommodated in the insertion hole, and has a release port at an end on the bottom side,
5. The pressure accumulator opening / closing device according to claim 3, wherein the drain oil passage communicates a space between the bottom portion of the insertion hole and the sleeve and an outside of the housing portion.   On the outer peripheral surface of the sleeve, a sleeve outer seal is provided between the port closer to the bottom of the first port and the second port and the end of the sleeve on the release port side. 6. The pressure accumulator opening and closing device according to claim 5, wherein a member is provided. A housing;
The accumulator opening and closing device according to claim 5 or 6, wherein the opening and closing device is accommodated in the housing and the first port communicates with the hydraulic control unit.
A pressure accumulator comprising: the accumulator body housed in the housing and coupled to the second port. The housing has a cylindrical shape with a bottom, and passes through an accumulator housing portion for housing the accumulator body provided on the bottom side, an opening, and a pressure chamber of the accumulator body and the inside and outside provided between the openings. A through-hole,
The accommodating portion is provided in close contact with the inner peripheral surface of the housing on the outer peripheral surface on the bottom side and the opening side of the housing,
The drain oil passage outlet opens into a gap formed between the housing portion and the housing, and the drain oil passage outlet, the gap, and the through hole communicate with each other.
The pressure accumulation device according to claim 7, wherein the through hole is disposed so as to be located in the oil stored in the storage portion when an inclination angle of an oil level of the storage portion is within a predetermined range.

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