JP2018204759A - Pressure accumulation device - Google Patents

Abstract

To provide a pressure accumulation device which can instantly generate a pressure and, in addition, is applicable even to a situation where supply of a pressure higher than the pressure outputted by a pressure supply source such as an oil pump is required.SOLUTION: A pressure accumulation device (1) is provided with: a first pressure accumulation chamber (110); a housing (100) equipped inside with a second pressure accumulation chamber (120) that has a cross sectional area larger than the cross sectional area of the first pressure accumulation chamber (110); a first piston (130) that is provided inside the first pressure accumulation chamber (110) and is moved in the first pressure accumulation chamber (110) along the inner wall (110a) of the first pressure accumulation chamber by the pressure supplied from a pressure supply source (2); a second piston (140) that is provided inside the second pressure accumulation chamber (120) and is moved in the second pressure accumulation chamber (120) along the inner wall (120a) of the second pressure accumulation chamber by the pressure supplied from the pressure supply source (2); and an elastic member (160) having one end abutting on the first piston (130) and the other end abutting on the second piston (140).SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pressure accumulator that is used, for example, in brakes, automatic transmissions, manual transmissions, and the like that are mounted on vehicles and that is used to accumulate hydraulic oil and release it when necessary.

  In recent vehicles, for the purpose of improving fuel efficiency, reducing exhaust emissions, reducing noise, and the like, vehicles equipped with so-called idling stop technology that automatically stops the engine while the vehicle is stopped have been proposed.

  When the engine stops, the operation of the oil pump, which is a hydraulic power source connected to the engine, generally stops. For example, a manual transmission that automatically disconnects and engages the clutch using an actuator is installed. In such a vehicle, since the oil supplied to the clutch also escapes from the oil passage, the clutch is in a disconnected state.

  On the other hand, when a predetermined condition is satisfied, such as when the driver depresses the accelerator pedal, the engine is restarted and the oil pump is also restarted.However, when the engine is restarted and the clutch is not engaged, There is a problem that a time difference occurs between the restart and the engagement of the clutch, and an engagement shock occurs.

  In Patent Document 1, in order to solve this problem, a pressure accumulating device is branched on an oil passage connecting an oil pump and a clutch so that oil in the oil passage of the clutch does not escape even when the engine is stopped. And an accumulator that supplies hydraulic pressure to the clutch when the engine is restarted and a system including the accumulator are disclosed.

JP 2000-313252 A

  In the pressure accumulating device described in Patent Document 1, as an auxiliary device at the time of stopping a hydraulic pressure supply source such as an oil pump, in a scene where it is necessary to instantaneously generate hydraulic pressure, such as the idling stop technique as described above. Is preferred. On the other hand, when it is necessary to supply even a small amount of hydraulic pressure compared with the hydraulic pressure of the hydraulic supply source, it is necessary to increase the physique of the hydraulic supply source itself to improve performance, or to provide another hydraulic supply source. There is a problem in terms of increase in power consumption and cost increase.

  The present invention has been made in view of the above problems, and can be applied to a scene where it is necessary to instantaneously generate pressure. Furthermore, the pressure higher than the pressure output from a pressure supply source such as an oil pump can be applied. It is an object of the present invention to provide a pressure accumulating device that can be applied even in a scene that needs to be supplied.

  The pressure accumulation device according to one aspect of the present invention is provided in a first pressure accumulation chamber, a housing having a second pressure accumulation chamber having a cross-sectional area larger than the cross-sectional area of the first pressure accumulation chamber, and the housing. A first flow path that includes a first communication hole and that communicates the pressure supply source with the first pressure accumulation chamber; a second communication hole that is provided in the housing; and the pressure supply source and the second pressure accumulation chamber. And a second switching valve provided on the first flow path, a second switching valve provided on the second flow path, and the first flow path. A first check valve provided between the pressure supply source and the first switching valve, and on the second flow path, provided between the pressure supply source and the second communication hole. A branch from the first flow path between the second check valve, the first switching valve and the first check valve, and output from the pressure supply source Or a conveyance path for carrying out pressure accumulated in the casing from the end, and a pressure output from the pressure supply source to the inner wall of the first pressure accumulation chamber. A first piston that moves along the first pressure accumulating chamber along the second pressure accumulating chamber, and a pressure output from the pressure supply source along the inner wall of the second pressure accumulating chamber. And an elastic member having one end abutting on the first piston and the other end abutting on the second piston.

  With this configuration, the hydraulic pressure of the pressure supply source can be supplied to the first pressure accumulation chamber, the elastic member can be bent, and pressure can be accumulated in the first pressure accumulation chamber. Thereby, when it is necessary to generate hydraulic pressure instantaneously, the pressure accumulator having such a configuration can be applied. In addition, after accumulating in the first accumulator, a predetermined operation is performed on the first switching valve and the second switching valve, so that the hydraulic pressure of the pressure supply source is supplied to the second accumulator. The elastic member can be further bent and accumulated in the second pressure accumulating chamber. Since the cross-sectional area of the second pressure accumulating chamber is designed to be larger than the cross-sectional area of the first pressure accumulating chamber, the hydraulic pressure of the pressure supply source is based on Pascal's principle. It will be accumulated even in. As a result, the pressure accumulation amount in the pressure accumulator having such a configuration is the sum of the accumulated pressure in the first accumulator and the accumulated pressure in the second accumulator, and as a result (as the deflection of the elastic member), the first accumulator. Is boosted. Accordingly, the pressure accumulating device having such a configuration can be applied even in a scene where it is necessary to supply a hydraulic pressure higher than the hydraulic pressure of the pressure supply source.

  In the pressure accumulator of the present invention, the first piston extends from a first pressure receiving surface that receives pressure output from the pressure supply source, and an end of the first pressure receiving surface, and the first pressure accumulating device. A first side wall facing the inner wall of the chamber, and a first abutting surface facing the first pressure receiving surface and abutting one end of the elastic member, wherein the first side wall is the first side of the first piston. It is preferable that the first pressure accumulation chamber protrudes from the first pressure accumulation chamber as the first pressure accumulation chamber moves.

  With this configuration, the pressure output from the pressure supply source is efficiently received by the first pressure receiving surface in the first pressure accumulating chamber and transmitted to the elastic member, thereby bending the elastic member. Thus, such pressure can be accumulated in the first accumulator chamber. Further, the elastic member may be damaged if it is bent more than the load resistance value. Therefore, after the first piston is provided with the first side wall and the first piston moves in the first pressure accumulating chamber, the first side wall protrudes into the second pressure accumulating chamber. The side wall is designed to prevent the elastic member from being damaged. The first side wall is provided so as to face the inner wall of the first pressure accumulation chamber, and efficiently guides the movement of the first piston in the first pressure accumulation chamber.

  Further, in the pressure accumulator of the present invention, the second piston receives a pressure output from the pressure supply source, and has a second pressure receiving surface having a pressure receiving area larger than the pressure receiving area of the first pressure receiving surface; A second side wall extending from an end of the second pressure receiving surface and facing the inner wall of the second pressure accumulating chamber, and a second abutting surface facing the second pressure receiving surface and the other end of the elastic member abutting The second abutment surface preferably abuts on the first side wall of the first piston as the second piston moves in the second pressure accumulating chamber.

  With this configuration, the pressure output from the pressure supply source is efficiently received by the second pressure receiving surface in the second pressure accumulating chamber and transmitted to the elastic member, thereby further bending the elastic member. In addition, such pressure can be accumulated in the second pressure accumulation chamber. The second abutment surface of the second piston is designed to abut against the first side wall of the first piston when the second piston moves in the second pressure accumulating chamber. Accordingly, the movement of the second piston for accumulating in the second accumulator chamber ends when the second abutting surface comes into contact with the first side wall, and the load resistance of the elastic member is increased. The deflection more than the value is prevented. The second side wall is provided to face the inner wall of the second pressure accumulating chamber, and efficiently guides the movement of the second piston in the second pressure accumulating chamber.

  In the pressure accumulating device of the present invention, the first switching valve is opened and the second switching valve is closed, and the pressure output from the pressure supply source is supplied into the first pressure accumulating chamber, After the first piston is moved against the urging force of the elastic member in the first pressure accumulating chamber, the pressure output from the pressure supply source is changed by closing the first switching valve. After accumulating in one pressure accumulating chamber, the first switching valve is closed and the second switching valve is opened, and the pressure output from the pressure supply source is supplied to the second pressure accumulating chamber, The second piston may be moved against the urging force of the elastic member in the second pressure accumulating chamber, and the pressure output from the pressure supply source may be accumulated in the second pressure accumulating chamber.

  With this configuration, the pressure output from the pressure supply source is efficiently supplied as the first stage in the first pressure accumulating chamber, and the first piston is moved against the urging force of the elastic member. Thus, the elastic member can be bent and the pressure can be accumulated in the first pressure accumulating chamber. Further, as a second stage, the pressure output from the pressure supply source is efficiently supplied in the second pressure accumulating chamber, and the second piston is moved against the urging force of the elastic member, The elastic member can be further bent to accumulate such pressure in the second pressure accumulation chamber. Further, with this configuration, when the first stage and the second stage are a series of pressure accumulation processes, the pressure accumulation amount in the pressure accumulator having such a configuration is equal to the pressure accumulation amount in the first pressure accumulation chamber and the pressure accumulation amount in the second pressure accumulation chamber. As a result of the total, the first pressure accumulation chamber is boosted.

  In the pressure accumulating device of the present invention, the first switching valve is opened and the second switching valve is closed, and the pressure output from the pressure supply source is supplied into the first pressure accumulating chamber, After the first piston is moved against the urging force of the elastic member in the first pressure accumulating chamber, the first switching valve is closed so that the pressure output from the pressure supply source is the first pressure. After accumulating in the pressure accumulating chamber, the first switching valve is closed and the second switching valve is opened, and the pressure output from the pressure supply source is supplied to the second pressure accumulating chamber, The second piston is moved against the urging force of the elastic member in the two pressure accumulating chambers, and the pressure output from the pressure supply source is accumulated in the second pressure accumulating chamber, and in the second pressure accumulating chamber. After accumulating, stopping the operation of the pressure source; and The serial first switching valve is opened condition, the accumulator pressure in the first accumulation chamber, it is preferable that depressurized into the conveying path.

  According to this configuration, the pressure accumulated and boosted in the first pressure accumulating chamber by opening the first switching valve among the pressures accumulated (pressure-raised) through the series of pressure accumulating steps described above, The pressure can be instantaneously released to the conveyance path. Specifically, when the pressure supply source is stopped and the first switching valve is opened in a state where pressure is accumulated in the first pressure accumulation chamber and the second pressure accumulation chamber, the elastic member bends. When the first piston moves in the first pressure accumulating chamber, the pressure accumulated in the first pressure accumulating chamber passes through the first switching valve. Pressure is released to the conveyance path. In addition, since the pressure released to the conveyance path is increased through the above-described series of pressure accumulating steps, the pressure is released at the increased pressure at the initial stage of releasing pressure. In accordance with the load characteristics, the pressure gradually decreases, and when the first piston moves to the initial position in the first pressure accumulation chamber, the pressure release ends. The pressure accumulator having such a configuration can be applied to, for example, the aforementioned idling stop technology for vehicles, various measuring instruments for vehicles, and the like.

  In the pressure accumulating device of the present invention, the first switching valve is opened and the second switching valve is closed, and the pressure output from the pressure supply source is supplied into the first pressure accumulating chamber, After the first piston is moved against the urging force of the elastic member in the first pressure accumulating chamber, the first switching valve is closed so that the pressure output from the pressure supply source is the first pressure. After accumulating in the pressure accumulating chamber, the first switching valve is closed and the second switching valve is opened, and the pressure output from the pressure supply source is supplied into the second pressure accumulating chamber. The second piston is moved against the urging force of the elastic member in the two pressure accumulating chambers, and the pressure output from the pressure supply source is accumulated in the second pressure accumulating chamber, and in the second pressure accumulating chamber. After accumulating, the first switching valve is opened, The pressure accumulated in one pressure accumulating chamber is released to the conveying path, and the second switching valve is opened, and the pressure output from the pressure supply source is further supplied to the second pressure accumulating chamber, By further moving the second piston against the biasing force of the elastic member in the second pressure accumulation chamber, the pressure output from the pressure supply source is further accumulated in the second pressure accumulation chamber. Also good.

  With this configuration, among the pressures accumulated (pressure-increasing) through the above-described series of pressure accumulating steps, the pressure accumulated (increased) in the first pressure accumulating chamber is instantaneously changed by opening the first switching valve. In addition, the pressure accumulation process in the second pressure accumulating chamber can be added at the same time as the pressure can be released to the transfer path, so that the pressure accumulating device having such a configuration can maintain the pressure increasing state. Therefore, the increased pressure can be continuously released.

  Specifically, when the first switching valve is opened in a state where pressure is accumulated in the first pressure accumulation chamber and the second pressure accumulation chamber, the elastic member emits an urging force in a direction to cancel the deflection. The first piston moves in the first pressure accumulating chamber (moves in the direction to return to the initial state), so that the pressure accumulated in the first pressure accumulating chamber passes through the first switching valve and is transferred to the first pressure accumulating chamber. The pressure is released to the road. On the other hand, since the second switching valve is also opened, the pressure output from the pressure supply source is supplied to the second pressure accumulating chamber (the first switching valve is also opened). However, since the pressure accumulated (boosted) in the first pressure accumulating chamber is released, the pressure output from the pressure supply source is not supplied to the first pressure accumulating chamber). The second piston moves in the second pressure accumulation chamber in a direction to bend the elastic member so as to follow the movement of the first piston in the first pressure accumulation chamber. Then, the amount of flexure of the elastic member is maintained so as to maintain the state of pressure accumulation (pressure increase) through the series of pressure accumulation processes described above, so the pressure increased through the series of pressure accumulation processes described above is maintained. , It is possible to continuously release pressure to the conveyance path.

  As described above, the pressure accumulator having such a configuration can continuously release the boosted pressure (high pressure), and thus can be applied to a pressure control system that requires high pressure supply.

  According to the present invention, it can be applied to a scene where a pressure needs to be generated instantaneously, and further applied to a scene where a pressure higher than the pressure output from a pressure supply source such as an oil pump needs to be supplied. It is possible to provide a pressure accumulator that can be used.

1 is a schematic block diagram showing a basic pressure accumulation system including a pressure accumulation device (partial cross-sectional view) and a pressure supply source in an initial state according to an embodiment of the present invention. 1 is a schematic block diagram showing a basic pressure accumulation system including a pressure accumulation device (partial cross-sectional view) and a pressure supply source during a pressure accumulation process according to an embodiment of the present invention. 1 is a schematic block diagram showing a basic pressure accumulation system including a pressure accumulation device (partial cross-sectional view) and a pressure supply source during a pressure accumulation process according to an embodiment of the present invention. 1 is a schematic block diagram showing a basic pressure accumulation system including a pressure accumulation device (partial cross-sectional view) and a pressure supply source during a pressure accumulation process according to an embodiment of the present invention. 1 is a schematic block diagram showing a basic pressure accumulation system including a pressure accumulation device (partial cross-sectional view) and a pressure supply source at the end of a pressure accumulation process according to an embodiment of the present invention. 1 is a schematic block diagram showing a basic pressure accumulation system including a pressure accumulation device (partially sectional view) and a pressure supply source during a pressure release process according to an embodiment of the present invention. 1 is a schematic block diagram showing a basic pressure accumulation system including a pressure accumulation device (partially sectional view) and a pressure supply source during a pressure release process according to an embodiment of the present invention. 1 is a schematic block diagram showing a basic pressure accumulation system including a pressure accumulation device (partial cross-sectional view) and a pressure supply source at the end of a pressure accumulation process according to an embodiment of the present invention. 1 is a schematic block diagram showing a basic pressure accumulation system including a pressure accumulation device (partially sectional view) and a pressure supply source during a pressure release process according to an embodiment of the present invention. 1 is a schematic block diagram showing a basic pressure accumulation system including a pressure accumulation device (partially sectional view) and a pressure supply source during a pressure release process according to an embodiment of the present invention.

  Hereinafter, various embodiments of the present invention will be described with reference to the accompanying drawings. In addition, the same referential mark is attached | subjected to the same component in drawing. It should also be noted that components represented in one drawing may be omitted in another drawing for convenience of explanation. Furthermore, it should be noted that the attached drawings are not necessarily drawn to scale.

Overall Configuration of Pressure Accumulator An overview of the overall configuration of the pressure accumulator 1 according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a schematic block diagram showing a basic pressure accumulation system including a pressure accumulation device 1 (partial sectional view) and a pressure supply source 2 in an initial state according to an embodiment of the present invention.

  As shown in FIG. 1, a pressure accumulating device 1 according to an embodiment of the present invention includes, on a pressure accumulating system including the pressure accumulating device 1, a pressure supply source 2 on the upstream side, a pressure supply circuit 3 on the downstream side, Each is connected. Specifically, a general supply source capable of generating hydraulic pressure such as an oil pump can be used as the pressure supply source 2. Also, a general supply source that generates water pressure or air pressure instead of hydraulic pressure can be used.

  The pressure supply circuit 3 may be an element or technology using hydraulic pressure, such as a brake system for a vehicle, an automatic transmission, or a manual transmission.

  The pressure accumulator 1 includes a housing 100. The housing 100 is provided with a first pressure accumulation chamber 110 having a predetermined cross-sectional area and a second pressure accumulation chamber 120 having a cross-sectional area larger than the cross-sectional area of the first pressure accumulation chamber 110. Furthermore, the housing 100 is provided with a first communication hole 101 and a second communication hole 102, and the first communication hole 101 allows the first pressure accumulation chamber 110 and the pressure supply source 2 to communicate ( When the first switching valve 13, which will be described later, is in an open state, the first pressure accumulating chamber 110 and the pressure supply source 2 communicate with each other.) A part of the first flow path 11 constitutes the second communication. The hole 102 communicates the second pressure accumulation chamber 120 and the pressure supply source 2 (when the second switching valve 23 described later is in an open state, the second pressure accumulation chamber 120 and the pressure supply source 2 communicate with each other. .) It constitutes a part of the second flow path 21. The configuration inside the housing 100 will be described later.

  In addition, as shown in FIG. 1, the 1st flow path 11 and the 2nd flow path 21 may share part, and each may be provided independently (without a shared part). Good.

  As shown in FIG. 1, the pressure accumulator 1 has a first switching valve 13 on the first flow path 11 and a second switching valve 23 on the second flow path 21. As the first switching valve 13 and the second switching valve 23, for example, a solenoid valve that opens when energized and closes the valve when de-energized can be used. In this case, the controller 300 that controls energization and de-energization of the first switching valve 13 and the second switching valve 23 may be provided in the pressure accumulator 1 as shown in FIG. You may provide in the central control part which controls the circuit 3 (for example, automatic transmission). For example, the control unit 300 determines the first switching valve 13 and the second switching valve 13 based on the output time of the pressure output from the pressure supply source 2, the positions of the first piston 130 and the second piston 140 in the housing 100, and the like. The switching of the energization or de-energization of the switching valve 23 is controlled.

  In addition, as shown in FIG. 1, the pressure accumulator 1 has a first check valve 15 on the first flow path 11 and between the pressure supply source 2 and the first switching valve 13. A second check valve 25 is provided on the second flow path 21 and between the pressure supply source 2 and the second communication hole 102. The first check valve 15 allows the pressure (for example, hydraulic pressure) output from the pressure supply source 2 to be supplied to the first pressure accumulation chamber 110, while the pressure accumulated in the first pressure accumulation chamber 110 is The first flow path 11 is prevented from flowing back to the pressure supply source 2. The second check valve 25 allows the pressure output from the pressure supply source 2 to be supplied to the second pressure accumulation chamber 120, while the pressure accumulated in the second pressure accumulation chamber 120 is the second pressure accumulation chamber 120. The flow is prevented from flowing back to the pressure supply source 2 through the flow path 21. In addition, what is generally marketed can be used for the first check valve 15 and the second check valve 25.

  As shown in FIG. 1, the pressure accumulator 1 is provided with a conveyance path 31 that branches from the first flow path 11 between the first switching valve 13 and the first check valve 15. One end 31 a of the conveyance path 31 is connected to the first flow path 11 so as to branch from the first flow path 11, and pressure is carried out to the pressure supply circuit 3 by the other end 31 b. . Thereby, the conveyance path 31 conveys the pressure output from the pressure supply source 2 to the pressure supply circuit 3 when the pressure supply source 2 is operating. In the state where the pressure is accumulated in the first pressure accumulation chamber 110, the pressure accumulated in the first pressure accumulation chamber 110 is supplied to the pressure supply circuit 3 on condition that the first switching valve 13 is opened. Conveying.

1. Configuration inside housing 100 (first pressure accumulation chamber 110 and second pressure accumulation chamber 120)
Next, the internal configuration of the housing 100 will be described in detail with reference to FIGS. 1 and 2. FIG. 2 is a schematic block diagram showing a basic pressure accumulating system including the pressure accumulating device 1 (a sectional view in the housing 100) and the pressure supply source 2 during the pressure accumulating step according to the embodiment of the present invention.

  As shown in FIGS. 1 and 2, the casing 100 has a cylindrical and hollow shape, and a first pressure accumulation chamber 110 having a predetermined cross-sectional area X and a first pressure accumulation chamber therein. A second pressure accumulating chamber 120 having a cross-sectional area Y (X <Y) larger than the cross-sectional area of 110 is provided. The cross-sectional shapes of the housing 100, the first pressure accumulation chamber 110, and the second pressure accumulation chamber 120 are not particularly limited, and for example, circular, elliptical, and polygonal shapes can be used. As described above, the first pressure accumulation chamber 110 communicates with the pressure supply source 2 by the first flow path 11 including the first communication hole 101, and the second pressure accumulation chamber 120 includes the second communication hole 102. The flow path 21 communicates with the pressure supply source 2.

  A first piston 130 is provided in the first pressure accumulation chamber 110. The first piston 130 extends from a first pressure receiving surface 131 that receives the pressure (hydraulic pressure) output from the pressure supply source 2, and an end portion (outer peripheral portion) of the first pressure receiving surface 131. A first side wall 132 that faces the inner wall 110a, and a first abutment surface 133 that opposes the first pressure receiving surface 131 and abuts on one end of an elastic member 160 described later.

  A second piston 140 is provided in the second pressure accumulation chamber 120. The second piston 140 extends from the second pressure receiving surface 141 that receives the pressure (hydraulic pressure) output from the pressure supply source 2 and the end (outer peripheral portion) of the second pressure receiving surface 141, and the second pressure accumulating chamber 120. A second side wall 142 that faces the inner wall 120a, and a second abutment surface 143 that opposes the second pressure receiving surface 141 and abuts on the other end of an elastic member 160 described later.

  An elastic member 160 is further provided in the housing 100. One end of the elastic member 160 is in contact with the first contact surface 133 of the first piston 130, and the other end of the elastic member 160 is in contact with the second contact surface 143 of the second piston 140.

  In addition, the elastic member 160 can use what can emit urging | biasing force by expanding / contracting, such as a general coil spring.

  Furthermore, in the housing 100, a first seal member 115 is provided between the first piston 130 and the inner wall 110 a of the first pressure accumulating chamber 110. The shape of the first seal member 115 can be along the cross-sectional shape of the first pressure accumulating chamber 110. By providing the first seal member 115, leakage of pressure (hydraulic pressure) supplied from the pressure supply source 2 into the first pressure accumulation chamber 110 can be prevented. Further, when an oil pump is used as the pressure supply source 2, it is possible to simply prevent oil leakage from the first pressure accumulation chamber 110.

  Similarly, in the housing 100, a second seal member 125 is provided between the second piston 140 and the inner wall 120 a of the second pressure accumulation chamber 120. The shape of the second seal member 125 can be along the cross-sectional shape of the second pressure accumulating chamber 120. By providing the second seal member 125, leakage of pressure (hydraulic pressure) supplied from the pressure supply source 2 into the second pressure accumulating chamber 120 can be prevented. Further, when an oil pump is used as the pressure supply source 2, oil leakage from the second pressure accumulation chamber 120 can be simply prevented.

  In the housing 100, a region sandwiched between the first piston 130 and the second piston 140 (region where the elastic member 160 is located) is filled with a liquid such as oil or air, as shown in FIG. As described above, when such a region is filled with a liquid such as oil, the air vent mechanism 170 is provided in the housing 100 so that the pressure can be accumulated efficiently.

2. Next, the pressure accumulation process will be described in detail with reference to FIGS. 1 to 4 regarding the pressure accumulation process in the pressure accumulator 1 having the above-described configuration. 2 to 4 are schematic blocks showing a basic pressure accumulating system including a pressure accumulating device 1 (a cross-sectional view in the housing 100) and a pressure supply source 2 during a pressure accumulating step according to an embodiment of the present invention. FIG.

2-1. About the first stage pressure accumulation process (accumulation in the first pressure accumulation chamber 110)
First, a process of accumulating pressure in the first pressure accumulating chamber 110 will be described as a first-stage pressure accumulating process with reference to FIGS. 1 to 3.

  FIG. 1 shows an initial state of the pressure accumulator 1, and the pressure supply 2 is not activated. Therefore, in the housing 100, the first piston 130 and the second piston 140 are arranged in the initial state in the first pressure accumulation chamber 110 and the second pressure accumulation chamber 120, respectively. Specifically, the first piston 130 is disposed in the first pressure accumulation chamber 110 in a state where at least a part of the first pressure receiving surface 131 is in contact with the inner wall 110 a of the first pressure accumulation chamber 110. Similarly, the second piston 140 is disposed in the second pressure accumulation chamber 120 in a state where at least a part of the second pressure receiving surface 141 is in contact with the inner wall 120 a of the second pressure accumulation chamber 120. Note that the elastic member 160 is disposed in the housing 110 in a pre-tensioned state (a state in which there is some bending), for example.

  Next, when the switch of the pressure supply source 2 is turned on and the first switching valve 13 is opened (the second switching valve 23 is closed), as shown in FIG. 2), the pressure (hydraulic pressure) output from the pressure supply source 2 passes through the first switching valve 13 and the first flow path 11 including the first communication hole 101. Finally, it is supplied into the first pressure accumulation chamber 110.

  When the pressure output from the pressure supply source 2 is supplied into the first pressure accumulating chamber 110, the pressure is received at the first pressure receiving surface 131 of the first piston 130, and at the same time, the first pressure receiving surface 131 is pressed, The first piston 130 is moved in the first pressure accumulating chamber 110 while resisting the urging force (elastic load) of the elastic member 160 (moved upward in the drawing in FIG. 2). As the first piston 130 moves, the elastic member 160 also gradually bends. The first piston 130 moves in the first pressure accumulating chamber 110 to a point where the pressure output from the pressure supply source 2 and the elastic load (for example, spring load) of the elastic member 160 are balanced while the elastic member 160 is bent. I will do it. Finally, when the pressure output from the pressure supply source 2 and the elastic load of the elastic member 160 are balanced, the movement of the first piston 130 ends. Note that the pressure P output from the pressure supply source 2 and the elastic load of the elastic member 160 are balanced if the cross-sectional area of the first piston 130 is the same as the cross-sectional area X of the first pressure accumulating chamber 110. For example, the load value transmitted to the elastic member 160 is “P × X”, and the point at which the load value corresponding to the predetermined deflection amount in the load characteristic of the elastic member 160 is “P × X”. Say.

  Here, as shown in FIG. 3 (transition from the state of FIG. 2 to the state of FIG. 3), when the first switching valve 13 is closed when the movement of the first piston 130 is completed, the pressure supply source The pressure (hydraulic pressure) supplied from 2 is held in the first pressure accumulating chamber 110 while being converted into the bending of the elastic member 160. Thereby, this pressure can be accumulated in the 1st pressure accumulation chamber 110 as a 1st step pressure accumulation process.

  In the transition change from the state of FIG. 1 to the state of FIG. 3, the first side wall 132 of the first piston 130 moves along the inner wall 110 a of the first pressure accumulating chamber 110. Here, the first side wall 132 extends from the end (outer peripheral portion) of the first pressure receiving surface 131 along the inner wall 110a, and the first piston 130 has a first pressure accumulation in the first side wall 132. As the chamber 110 moves, it is finally designed to protrude into the second pressure accumulating chamber 120. This prevents the elastic member 160 from being damaged due to bending more than necessary and the load characteristics of the elastic member 160 from being changed. The length of the first side wall 132 (the length extending along the inner wall 110a of the first pressure accumulating chamber 110) can be appropriately adjusted in consideration of the load characteristics of the elastic member 160, the degree of pressure increase, and the like. For example, as the length of the first side wall 132 is shortened, the movement amount of the second piston 140 is relatively increased, and the total deflection amount of the elastic member 160 is increased. Therefore, the degree of boosting can be increased.

  Specifically, in the case where the first side wall 132 is not provided and the pressure output from the pressure supply source 2 greatly exceeds the load resistance value of the elastic member 160, the first contact surface The elastic member 160 may be bent to such an extent that 133 and the second contact surface 143 substantially overlap (contact). If it does so, there exists a possibility that the load characteristic in the elastic member 160 may change significantly, or the elastic member 160 itself may be damaged. However, if the first side wall 132 as shown in FIG. 1 to FIG. 3 is provided, the second side contact surface 143 must be in contact with the first side contact surface 133 before being brought into contact (contact). And the movement of the second piston 140 is restricted. Thereby, the above-mentioned damage of the elastic member 160 can be prevented.

  By the way, in the state of FIG. 2, the pressure output from the pressure supply source 2 is supplied to the pressure supply circuit 3 via the transport path 31 simultaneously with the first pressure accumulating chamber 110. Therefore, in the pressure accumulating device 1 according to an embodiment of the present invention, for example, a brake system for a vehicle, an automatic transmission, a manual transmission, and the like can be operated by the pressure supply source 2 and simultaneously accumulated. In the state of FIG. 3 in which the first-stage pressure accumulation process is completed, the operation may be continued by turning on the switch of the pressure supply source 2, or the switch of the pressure supply source 2 may be turned off. Good.

2-2. Regarding the second-stage pressure accumulation (pressure increase) process (accumulation in the second pressure accumulation chamber 120)
Subsequently, a process of accumulating pressure in the second pressure accumulating chamber 120 will be described as a second-stage pressure accumulating process with reference to FIG.

  As described above, after the pressure accumulation process of the first stage is completed, the switch of the pressure supply source 2 is turned on and the pressure supply source 2 is operated (or the switch of the pressure supply source 2 is turned on in the state of FIG. 3). When the operation is continued, the operation state is maintained). In addition, when the first switching valve 13 that is closed in the state of FIG. 3 is in the closed state and the second switching valve 23 is in the open state, as shown in FIG. 4 (from the state of FIG. 3). 4), the pressure (hydraulic pressure) output from the pressure supply source 2 passes through the second switching valve 23 and the second flow path 21 including the second communication hole 102. Finally, it is supplied into the second pressure accumulation chamber 120.

  When the pressure output from the pressure supply source 2 is supplied into the second pressure accumulating chamber 120, the pressure is received at the second pressure receiving surface 141 of the second piston 140, and at the same time, the second pressure receiving surface 141 is pressed, The second piston 140 is moved in the second pressure accumulating chamber 120 while resisting the urging force (elastic load) of the elastic member 160 (moves downward in the drawing in FIG. 4).

  Here, the principle by which the second piston 140 moves in the second pressure accumulation chamber 120 based on the pressure output from the pressure supply source 2 will be described. The pressure supplied into the second pressure accumulating chamber 120 is the same as the pressure supplied into the first pressure accumulating chamber 110 in the first stage described above, while the first pressure receiving surface in the first piston 130. Compared to the cross sectional area 131 (pressure receiving area) of 131, the cross sectional area (pressure receiving area) of the second pressure receiving surface 141 of the second piston 140 is larger. Here, if the cross-sectional area of the first pressure receiving surface 131 is the same as the cross-sectional area X of the first pressure accumulating chamber 110, the load value transmitted to the elastic member 160 is “P × X”, while the second If the cross-sectional area of the pressure receiving surface 141 is the same as the cross-sectional area Y of the second pressure accumulating chamber 120, the load value transmitted to the elastic member 160 is “P × Y”. Here, as described above, since Y is a value greater than X, the load transmitted to the elastic member 160 via the second piston 140 is applied to the elastic member 160 via the first piston 130. And larger than the transmitted load. This is an application of the Pascal principle, and based on this principle, the second piston 140 can move in the second pressure accumulating chamber 120.

  As the second piston 140 moves, the elastic member 160 is further bent. As a result, the pressure (hydraulic pressure) output from the pressure supply source 2 is accumulated in the second pressure accumulating chamber 120 while being converted into further deflection of the elastic member 160, so that the pressure accumulating device 1 as a whole is supplied with pressure. The pressure output from the source 2 is increased and stored. When the second contact surface 143 of the second piston 140 finally contacts the first side wall 132 of the first piston 130 as in the state of FIG. 5A or FIG. 6A, a second-stage pressure accumulating step. (Pressure boosting step) ends.

  Note that, as in the state of FIG. 5A or FIG. 6A, the second-stage pressure accumulation process ends when the second contact surface 143 contacts the first side wall 132 and the movement of the second piston 140 is restricted. Will be.

  By the way, as a means for restricting the movement of the second piston 140, instead of providing the first side wall 132, a convex portion protruding from the inner wall 120a of the second pressure accumulation chamber 120 toward the second pressure accumulation chamber 120 may be provided. Good.

3. Next, the details of the pressure release process in the pressure accumulator 1 having the above-described configuration will be described with reference to FIGS. 5A to 5C and FIGS. 6A to 6C. 5A and 6A are schematic views showing a basic pressure accumulation system including a pressure accumulation device 1 (a cross-sectional view in the case 100) and a pressure supply source 2 at the end of the pressure accumulation step according to an embodiment of the present invention. It is a block diagram. 5B, FIG. 5C, FIG. 6B, and FIG. 6C include a pressure accumulator 1 (a cross-sectional view in the casing 100) and a pressure supply source 2 during the pressure releasing process according to an embodiment of the present invention. It is a schematic block diagram which shows a typical pressure accumulation system.

3-1. First Pressure Release Method First, the first pressure release method will be described with reference to FIGS. 5A to 5C.

  FIG. 5A shows a state in which the above-described second stage pressure accumulation (pressure increase) step is completed. The second contact surface 143 of the second piston 140 contacts the first side wall 132 of the first piston 130, and The movement of the two pistons 140 is restricted. At this stage, the switch of the pressure supply source 2 is turned OFF to stop the operation.

  Next, when the first switching valve 13 is opened while the switch of the pressure supply source 2 is OFF, the pressure is converted into the bending of the elastic member 160 as shown in FIG. Then, the increased pressure is released to the transport path 31 via the first flow path 11. Thereby, the pressure accumulated and boosted in the first pressure accumulation chamber 110 can be instantaneously released to the conveyance path 31. More specifically, when the operation of the pressure supply source 2 is stopped and the first switching valve 13 is opened in the state where the pressure is accumulated in the first pressure accumulation chamber 110 and the second pressure accumulation chamber 120, the elasticity is increased. The member 160 emits an urging force in a direction to eliminate the bending, and the first piston 130 moves in the first pressure accumulation chamber 110 (moves downward in the drawing in FIG. 5B). As a result, the pressure accumulated in the first pressure accumulation chamber 110 is released to the transport path 31 via the first switching valve 13. In addition, since the pressure released to the conveyance path 31 is increased through the above-described series of first-stage and second-stage pressure accumulation processes, the pressure is initially released at the increased pressure value. The

  In addition, while the pressure accumulated in the 1st pressure accumulation chamber 110 is released, the pressure accumulated in the 2nd pressure accumulation chamber 120 is made into the 2nd non-return by keeping the 2nd switching valve 23 in an open state. The valve 25 cannot reversely flow through the second flow path 21, and the pressure accumulated in the second pressure accumulation chamber 120 is maintained as it is.

  Thereafter, as shown in FIG. 5C, the pressure accumulated in the first pressure accumulation chamber 110 is changed until the first piston 130 returns to the initial state (the first pressure receiving surface 131 in the first piston 130 is the first pressure accumulation chamber 110). As long as the movement continues (until it abuts against the inner wall 110a), the pressure is released to the transport path 31. Note that the magnitude of the pressure released to the conveyance path 31 is released at the increased pressure value in the initial stage of the pressure release as described above, but thereafter, according to the load characteristics of the elastic member 160. It gradually decreases gradually and finally becomes zero. In this way, in the initial stage of pressure release, the pressure release method in which the increased pressure is released and then gradually reduced is applied to, for example, the aforementioned idling stop technology for vehicles and various measuring instruments for vehicles. Can be applied.

  Further, in the first pressure releasing method, the switch of the pressure supply source 2 is always OFF in the pressure releasing process, and therefore, it is preferably used in a scene where importance is placed on energy saving.

  In addition, after all the pressure accumulated in the 1st pressure accumulation chamber 110 is released, it is preferable to release the pressure (residual pressure) accumulated in the 2nd pressure accumulation chamber 120, and to return to an initial state. In this case, for example, a method of releasing the residual pressure by connecting the second pressure accumulating chamber 120 to an oil tank (not shown) provided separately can be considered. In addition, a new switching valve connecting the second pressure accumulation chamber 120 and the pressure supply circuit 3 is separately conveyed so that the pressure accumulated in the second pressure accumulation chamber 120 can also be released to the pressure supply circuit 3. A combination of roads (not shown) may be provided. When all the pressure accumulated in the first pressure accumulation chamber 110 and the second pressure accumulation chamber 120 is released, the pressure accumulation device 1 returns to the initial state.

3-2. Second Pressure Release Method Next, the second pressure release method will be described with reference to FIGS. 6A to 6C.

  FIG. 6A shows a state in which the above-described second stage pressure accumulation (pressure increase) step is completed. The second contact surface 143 of the second piston 140 contacts the first side wall 132 of the first piston 130, and The movement of the two pistons 140 is restricted. However, unlike the first pressure release method, even in the state of FIG. 6A, the switch of the pressure supply source 2 is turned on and the operation is continued. Further, the second switching valve 23 is always open.

  Next, when the first switching valve 13 is opened while the switch of the pressure supply source 2 is turned on and the second switching valve 23 is opened, the elastic member 160 is bent as shown in FIG. 6B. Among the pressures that have been converted into the pressure and accumulated (increased) through the above-described series of accumulating steps, the pressure accumulated and increased in the first pressure accumulating chamber 110 passes through the first flow path 11 and is conveyed. The pressure is released to 31. Thereby, the pressure accumulated and boosted in the first pressure accumulation chamber 110 can be instantaneously released to the conveyance path 31. More specifically, the first switching valve 13 and the second switching valve 23 are set while the operation of the pressure supply source 2 is continued in the state where the pressure is accumulated in the first pressure accumulation chamber 110 and the second pressure accumulation chamber 120. When in the open state, the elastic member 160 emits an urging force in a direction to cancel the bending, and the first piston 130 moves in the first pressure accumulation chamber 110 (moves downward in the drawing in FIG. 6B). As a result, the pressure accumulated in the first pressure accumulation chamber 110 is released to the transport path 31 via the first switching valve 13.

  On the other hand, the first piston 130 moves in the first pressure accumulating chamber 110 (moves downward in the drawing in FIG. 6B), whereby the second contact surface 143 of the second piston 140 and the first side wall of the first piston 130 are moved. The contact relationship with 132 is eliminated, and the movement of the second piston 140 is allowed. Here, the pressure from the pressure supply source 2 is continuously supplied into the second pressure accumulating chamber 120 with the second switching valve 23 in the open state. The second pressure accumulation chamber 120 is moved again so as to follow the movement of the first piston 130. Thus, the movement of the first piston 130 for releasing the pressure accumulated in the first pressure accumulation chamber 110 to the conveyance path 31 and the pressure output from the pressure supply source 2 are set in the second pressure accumulation chamber 120. The movement of the second piston 140 for accumulating (increasing) pressure in FIG. 6 appears to occur integrally, and finally the state of FIG. 6B to the state of FIG. 6C (the first pressure receiving surface 131 of the first piston 130 is changed). Then, a transition is made to a state of contacting the inner wall 110a of the first pressure accumulation chamber 110 (initial state), and the pressure release and pressure increase are completed.

  Accordingly, the pressure released from the first pressure accumulating chamber 110 to the conveyance path 31 has been increased through the above-described series of first and second stages of accumulating processes, and thus was initially increased. The pressure is released at the pressure value. In addition, even after the initial pressure release, unlike the first pressure release method described above, as described above, the pressure increasing process is continuously performed simultaneously with the pressure releasing process. The value can always be constant at the initial boosted pressure value until the end of the pressure release process, and the high pressure supply can be supplied instantaneously and continuously.

  Such a second pressure releasing method can be suitably used in a scene where a high pressure needs to be supplied instantaneously and continuously.

  As mentioned above, although embodiment of this invention was illustrated, the said embodiment is an example to the last, Comprising: It is not intending limiting the range of invention. The above embodiments can be implemented in various other forms, and various omissions, substitutions, and changes can be made without departing from the scope of the invention. Each configuration, shape, size, length, width, thickness, height, number, and the like can be changed as appropriate. The arrangement and configuration of each part of the pressure accumulator 1 are not limited to the above embodiment.

DESCRIPTION OF SYMBOLS 1 Pressure accumulator 2 Pressure supply source 3 Pressure supply circuit 11 1st flow path 13 1st switching valve 15 1st check valve 21 2nd flow path 23 2nd switching valve 25 2nd check valve 31 Conveyance path 31a One end 31b of the conveyance path 100 Other end of the conveyance path 100 Housing 101 First communication hole 102 Second communication hole 110 First pressure accumulation chamber 110a Inner wall of the first pressure accumulation chamber 115 First seal member 120 Second pressure accumulation chamber 120a Second pressure accumulation Chamber inner wall 125 Second seal member 130 First piston 131 First pressure-receiving surface 132 First side wall 133 First contact surface 140 Second piston 141 Second pressure-receiving surface 142 Second side wall 143 Second contact surface 160 Elastic member

Claims (6)

A housing having a first pressure accumulation chamber and a second pressure accumulation chamber having a cross-sectional area larger than the cross-sectional area of the first pressure accumulation chamber;
A first flow path that includes a first communication hole provided in the housing and communicates the pressure supply source with the first pressure accumulation chamber;
A second flow path including a second communication hole provided in the housing, and communicating the pressure supply source and the second pressure accumulation chamber;
A first switching valve provided on the first flow path;
A second switching valve provided on the second flow path;
A first check valve provided on the first flow path and between the pressure supply source and the first switching valve;
A second check valve provided on the second flow path and between the pressure supply source and the second communication hole;
Branches from the first flow path between the first switching valve and the first check valve, and carries out the pressure output from the pressure supply source or the pressure accumulated in the housing from the end. A transport path to be
A first piston that is provided in the first pressure accumulation chamber and moves in the first pressure accumulation chamber along an inner wall of the first pressure accumulation chamber by pressure output from the pressure supply source;
A second piston that is provided in the second pressure accumulation chamber and moves in the second pressure accumulation chamber along an inner wall of the second pressure accumulation chamber by a pressure output from the pressure supply source;
An elastic member having one end in contact with the first piston and the other end in contact with the second piston;
An accumulator that accumulates pressure output from the pressure supply source. The first piston receives a pressure output from the pressure supply source;
A first side wall extending from an end of the first pressure receiving surface and facing an inner wall of the first pressure accumulation chamber;
A first abutting surface facing the first pressure-receiving surface and abutting one end of the elastic member;
The pressure accumulation device according to claim 1, wherein the first side wall projects from the first pressure accumulation chamber to the second pressure accumulation chamber as the first piston moves in the first pressure accumulation chamber. The second piston receives pressure output from the pressure supply source, and has a second pressure receiving surface having a pressure receiving area larger than the pressure receiving area of the first pressure receiving surface;
A second side wall extending from an end of the second pressure receiving surface and facing an inner wall of the second pressure accumulating chamber;
A second contact surface facing the second pressure receiving surface and contacting the other end of the elastic member,
The pressure accumulator according to claim 2, wherein the second abutting surface abuts on the first side wall of the first piston as the second piston moves in the second accumulator chamber. The first switching valve is opened and the second switching valve is closed, and the pressure output from the pressure supply source is supplied to the first pressure accumulating chamber, and the first piston is disposed in the first pressure accumulating chamber. After the pressure is moved against the urging force of the elastic member, the first switching valve is closed to accumulate the pressure output from the pressure supply source in the first pressure accumulating chamber,
The first switching valve is closed and the second switching valve is opened, and the pressure output from the pressure supply source is supplied to the second pressure accumulation chamber, and the second piston is set in the second pressure accumulation chamber. Is moved against the urging force of the elastic member, and the pressure output from the pressure supply source is accumulated in the second pressure accumulating chamber,
The pressure accumulator according to any one of claims 1 to 3. The first switching valve is opened and the second switching valve is closed, the pressure output from the pressure supply source is supplied to the first pressure accumulating chamber, and the first piston is placed in the first pressure accumulating chamber. After moving against the urging force of the elastic member, after accumulating the pressure output from the pressure supply source in the first accumulator chamber by closing the first switching valve,
The first switching valve is closed and the second switching valve is opened, and the pressure output from the pressure supply source is supplied to the second pressure accumulation chamber, and the second piston is set in the second pressure accumulation chamber. Is moved against the urging force of the elastic member, and the pressure output from the pressure supply source is accumulated in the second pressure accumulating chamber,
After accumulating in the second accumulator, the operation of the pressure supply source is stopped, and the first switching valve is opened to release the pressure accumulated in the first accumulator into the transport path. The pressure accumulator according to claim 4, which presses. The first switching valve is opened and the second switching valve is closed, the pressure output from the pressure supply source is supplied to the first pressure accumulating chamber, and the first piston is placed in the first pressure accumulating chamber. After moving against the urging force of the elastic member, after accumulating the pressure output from the pressure supply source in the first accumulator chamber by closing the first switching valve,
The first switching valve is closed and the second switching valve is opened, and the pressure output from the pressure supply source is supplied to the second pressure accumulating chamber, and the second piston is disposed in the second pressure accumulating chamber. Is moved against the urging force of the elastic member, and the pressure output from the pressure supply source is accumulated in the second pressure accumulating chamber,
After accumulating in the second pressure accumulating chamber, the first switching valve is opened, the pressure accumulated in the first accumulating chamber is released to the transfer path, and the second switching valve is opened. By further supplying the pressure output from the pressure supply source into the second pressure accumulating chamber, and further moving the second piston against the urging force of the elastic member in the second pressure accumulating chamber, The pressure accumulator according to claim 4, wherein the pressure output from the pressure supply source is further accumulated in the second pressure accumulation chamber.

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