Split type hydraulic pressure buildup assembly, control valve and brake-by-wire system

Abstract

The utility model discloses a split type hydraulic pressure building assembly, a control valve and a brake-by-wire system, which comprise a pump body, a piston assembly, a first elastic adjusting piece and a second elastic adjusting piece, the pump body is provided with a cavity extending along the axis direction and a liquid outlet hole communicated with the cavity; the piston assembly is provided with a cavity extending in the axis direction and a liquid inlet hole communicated with the cavity, at least one part of the piston assembly is arranged in the cavity of the pump body and slides in a reciprocating mode in the axis direction, the first elastic adjusting piece is arranged in the cavity formed by the piston assembly and the pump body, and at least one part of the first elastic adjusting piece is arranged in the piston assembly. The second elastic adjusting piece is arranged on a sealing part at the right end of the pump body and serves as a switch for communicating a liquid inlet channel in the control valve with a moving cavity of the piston assembly, and the second elastic adjusting piece serves as a switch for communicating the moving cavity of the piston assembly with a liquid outlet channel in the control valve. The plunger pump solves the problems that in the prior art, a plunger pump is not easy to assemble, the internal structure is complex, and the space occupancy rate is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic pressure building units, and particularly relates to a split-type hydraulic pressure building component, a control valve and a wire control braking system. Background Art

[0002] With the rapid development of new energy vehicles, the demand for linear control of the vehicle braking system is getting higher and higher. At present, the existing wire control braking system EHB in the market has the problem of high space occupancy of the whole vehicle.

[0003] The plunger pump is an important component unit in the wire control braking system EHB. Driven by the motor, the piston reciprocates in the pump body, so that the volume of the sealed working cavity changes to realize oil absorption, oil pressure and the purpose of establishing hydraulic pressure.

[0004] At present, the traditional plunger pump has problems such as difficult assembly, complex internal structure, high space occupancy and low pressure building efficiency. Moreover, it has high requirements for the processing accuracy of parts, which increases the production cost of enterprises to a certain extent. Summary of the Utility Model

[0005] Aiming at the above deficiencies of the prior art, the utility model provides a shock absorption structure, a vibration device and a vehicle applying the same.

[0006] The purpose of this application is achieved through the following technical solutions:

[0007] In a first aspect, a split-type hydraulic pressure building component is provided, including:

[0008] A pump body having a cavity extending in the axial direction and a liquid outlet hole communicating with the cavity;

[0009] A piston assembly having a cavity extending in the axial direction and a liquid inlet hole communicating with the cavity, at least a part of the piston assembly being arranged in the cavity of the pump body and reciprocatingly sliding in the axial direction;

[0010] A first elastic adjusting member, arranged in the cavity formed by the piston assembly and the pump body and at least a part being arranged in the piston assembly, the first elastic adjusting member serving as a switch for the liquid inlet channel in the control valve to communicate with the movement cavity of the piston assembly;

[0011] A second elastic adjusting member, arranged on the sealing part at the right end of the pump body, the second elastic adjusting member serving as a switch for the movement cavity of the piston assembly to communicate with the liquid outlet channel in the control valve;

[0012] Wherein, the direction in which the length of the pump body extends is the first direction.

[0013] In some embodiments, when the piston assembly drives the first elastic adjusting member to move in the first direction to a specified position, at least a part of the first elastic adjusting member contacts the inner wall of the piston assembly, so that the oil inlet passage inside the piston assembly is in a closed state. At this time, the oil pressure in the cavity of the pump body pushes the second elastic adjusting member to move in the first direction, and the oil outlet passage in the pump body is in an open state.

[0014] In some embodiments, when no oil flows out of the liquid outlet hole on the pump body, the second elastic adjusting member moves in the direction opposite to the first direction under the elastic force. At this time, the oil outlet passage in the pump body is in a closed state, and the elastic force of the first elastic adjusting member pushes the piston assembly to move in the direction opposite to the first direction to a specified position. At this time, at least a part of the first elastic adjusting member is separated from the inner wall of the piston assembly, so that the oil inlet passage inside the piston assembly is in an open state.

[0015] In some embodiments, the piston assembly includes:

[0016] A piston capable of reciprocatingly sliding in the first direction, disposed in the pump body and having a cavity extending in the length direction;

[0017] A piston seat having a cavity extending in the axial direction and a liquid inlet hole communicating with the cavity, sleeved on the outer side wall of the left end of the piston and connected to the left end of the pump body;

[0018] A detachable piston rod, passing through the through hole in the center of the piston and connected to the left end of the piston.

[0019] In some embodiments, the first elastic adjusting member includes:

[0020] A spring support cover having a plurality of through holes, disposed on the right end face of the piston for the piston to return to its original position;

[0021] A first spring, disposed in the cavity of the pump body, one end connected to the spring support cover and the other end connected to the inner side wall of the pump body;

[0022] A first sphere, disposed in the cavity formed by the piston and the spring support cover, serving as a switch for the liquid inlet passage in the control valve to communicate with the moving cavity of the piston.

[0023] In some embodiments, the second elastic adjusting member includes:

[0024] A second spring, disposed in the groove of the sealing portion of the pump body;

[0025] A second sphere, which is arranged in a groove of the sealing part of the pump body and at the end of the second spring, serves as a switch for the movement cavity of the piston assembly to communicate with the liquid outlet channel in the control valve.

[0026] In a second aspect, a control valve is provided, which includes no less than two of the split hydraulic pressure building components. At least a part of the split hydraulic pressure building components are symmetrically arranged on both sides of the eccentric shaft of the motor, and further includes:

[0027] A valve body having a cavity extending in the length direction and a liquid inlet channel and a liquid outlet channel communicating with the cavity. All of the split hydraulic pressure building components are arranged in the cavity of the valve body;

[0028] A motor, which is arranged at the center of the control valve. The ends of all the piston assemblies are in contact with the eccentric shaft of the motor.

[0029] In some embodiments, when the motor works, the eccentric shaft of the motor controls the piston assembly of one of the split hydraulic pressure building components to move along the first direction, while the piston assembly of the other split hydraulic pressure building component moves in the direction opposite to the first direction under the elastic force of the corresponding first elastic adjusting member. The piston assembly and the corresponding first elastic adjusting member move to a specified position along the first direction or the direction opposite to the first direction. At this time, the oil inlet passage inside the piston assembly moving along the first direction is in a closed state, and the oil outlet passage in the corresponding pump body is in an open state. The oil inlet passage inside the piston assembly moving in the direction opposite to the first direction is in an open state, and the oil outlet passage in the corresponding pump body is in a closed state.

[0030] In a third aspect, a wire-controlled braking system is provided, which includes the control valve.

[0031] The beneficial effects of the present invention are as follows: The internal structure of the split hydraulic pressure building component of the present invention is more compact, with a smaller volume, higher pressure building efficiency, longer service life and higher reliability. It can quickly provide the required liquid pressure for the pipeline in the wire-controlled braking system EHB to meet the pressure building requirements of the vehicle's braking force. The internal structure of the whole device is simple, easy to assemble, saves space, and has lower requirements for the machining accuracy of parts, which greatly reduces the production cost of enterprises. Description of the Drawings

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the following described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0033] Figure 1 It is a schematic structural diagram of a split hydraulic pressure building component provided by the present utility model in an embodiment;

[0034] Figure 2 It is a schematic structural diagram of a pump body provided by the present utility model in an embodiment;

[0035] Figure 3 It is a schematic structural diagram of a piston provided by the present utility model in an embodiment

[0036] Figure 4 It is a schematic structural diagram of a piston seat provided by the present utility model in an embodiment. Detailed implementation manners

[0037] For a better understanding of the technical solutions of the present application, the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0038] The present utility model provides a split hydraulic pressure building component, which solves the problems that a common plunger pump is not easy to assemble, has a complex internal structure, and a high space occupancy rate. The present utility model also provides a control valve applying the split hydraulic pressure building component, and a linear motion control system applying the control valve.

[0039] As Figures 1-4 shown, in an embodiment, a split hydraulic pressure building component 70 is provided. The split hydraulic pressure building component 70 includes a pump body 10, a piston assembly 20, a first elastic adjusting member 30, and a second elastic adjusting member 40.

[0040] The pump body 10 has a cavity extending in the axial direction and a liquid outlet hole R communicating with the cavity. The direction in which the length of the pump body 10 extends is the first direction X; in an embodiment, as Figures 1-2 shown, the pump body 10 has a variable cross-section cavity extending in the first direction X. The cavity of the pump body 10 has a first limiting surface 1021 and a second limiting surface 1022. A through hole for the flow of the oil liquid is provided at the connection of the first limiting surface 1021 and the second limiting surface 1022; a sealing portion 101 is installed on the right end surface of the pump body 10, and a groove is provided at the center of the bottom of the sealing portion 101;

[0041] The piston 201 assembly 20 has a cavity extending in the axial direction and a liquid inlet hole P communicating with the cavity. At least a part of the piston 201 assembly 20 is arranged in the cavity of the pump body 10 and reciprocates axially; in an embodiment, as Figure 1 shown, the piston assembly 20 includes a piston 201, a piston seat 202, and a piston rod 203; in an embodiment, the piston 201 can reciprocate in the first direction X. The piston 201 is arranged in the pump body 10 and has a cavity extending in the length direction; in an embodiment, as Figure 1 andFigure 3 As shown, the piston 201 has a cavity with a variable cross-section extending in the first direction X. At the connection between the cavity at the left end of the piston 201 and the cavity in the middle of the piston 201, there is a third limiting surface 2011. At the connection between the cavity in the middle of the piston 201 and the cavity at the right end of the piston 201, there is a fourth limiting surface 2012. At the center of the third limiting surface 2011, there is a through hole for the flow of the supply liquid. In one embodiment, as Figure 1 and Figure 4 shown, the piston seat 202 has a cavity extending in the first direction X and a liquid inlet hole P communicating with the cavity. The piston seat 202 is sleeved on the outer wall at the left end of the piston 201 and is connected to the left end of the pump body 10. In one embodiment, the piston seat 202 is sleeved on the left end of the piston 201 and is connected to the left end of the pump body 10 through a fifth limiting surface 2021 on the piston seat 202. The piston seat 202 and the pump body 10 are connected in a cooperating manner through a first sealing ring 204, and the first sealing ring 204 is arranged on the outer side of the piston 201. The first sealing ring 204 can prevent debris and impurities between the piston 201 and the piston seat 202 from dry grinding and damaging the components, greatly increasing the fault tolerance rate of the split hydraulic pressure building component 70, being easy to install, being able to extend the service life of the entire unit, and playing a sealing role at the same time. In one embodiment, the first sealing ring 204 is an O-ring, and it can also be replaced by a sealing structure made of other materials resistant to hydraulic oil and wear-resistant, such as leather cups, rectangular rings, oil seals, etc. In one embodiment, the detachable piston rod 203 passes through the through hole at the center of the piston 201 and is connected to the left end of the piston 201. In one embodiment, the right end of the piston rod 203 passes through the through hole at the center of the left end of the piston 201 and is connected to the left end of the piston 201. In one embodiment, since there will be frequent friction and collision when the eccentric shaft of the motor 60 drives the piston rod 203 to rotate, the piston rod 203 needs to be made of a material with relatively high hardness requirements. Therefore, the piston rod 203 and the piston 201 are connected in a split connection manner, and the piston rod 203 with appropriate hardness, heat treatment, etc. requirements can be selected separately without affecting the accuracy of the piston 201;

[0042] The first elastic adjusting member 30 is arranged in the cavity formed by the piston assembly 20 and the pump body 10 and at least a part of it is arranged in the piston assembly 20. The first elastic adjusting member 30 serves as a switch for connecting the liquid inlet channel in the control valve and the moving cavity of the piston assembly 20;

[0043] In one embodiment, as Figures 1-2As shown, the first elastic adjusting member 30 includes a spring support cover 301, a first spring 302, and a first sphere 303; in one embodiment, the spring support cover 301 has a plurality of through holes and is disposed on the right end face of the piston 201 for the return of the piston 201; in one embodiment, the spring support cover 301 has a plurality of limit counterbores and is disposed on the fourth limit surface 2012 of the piston 201, and the spring support cover 301 cooperates with the first spring 302 to work for the return of the piston 201; in one embodiment, the first spring 302 is disposed in the cavity of the pump body 10, one end is connected to the spring support cover 301 and the other end is connected to the inner side wall of the pump body 10; in one embodiment, the first spring 302 is disposed in the cavity of the pump body 10, one end is connected to the spring support cover 301 and the other end is connected to the first limit surface 1021 on the pump body 10; in one embodiment, the first sphere 303 is disposed in the cavity formed by the piston 201 and the spring support cover 301 and serves as a switch for the liquid inlet passage in the control valve to communicate with the moving cavity of the piston 201; in one embodiment, the first sphere 303 is disposed in the cavity formed by the third limit surface 2011 of the piston 201 and the spring support cover 301 for adjusting the flow rate of the oil in the piston 201; in one embodiment, the first sphere 303 is made of steel;

[0044] The second elastic adjusting member 40 is disposed on the sealing portion 101 at the right end of the pump body 10, and the second elastic adjusting member 40 serves as a switch for the moving cavity of the piston assembly 20 to communicate with the liquid outlet passage in the control valve;

[0045] In one embodiment, as Figure 1 described, the second elastic adjusting member 40 includes a second spring 401 and a second sphere 402; in one embodiment, the second spring 401 is disposed in the groove of the sealing portion 101 of the pump body 10, and the second sphere 402 is disposed in the groove of the sealing portion 101 of the pump body 10 and at the end of the second spring 401 and serves as a switch for the moving cavity of the piston assembly 20 to communicate with the liquid outlet passage in the control valve; in one embodiment, the second sphere 402 is disposed between the second limit surface 1022 of the pump body 10 and the right end of the second spring 401 for controlling the communication between the liquid outlet hole R on the pump body 10 and the liquid outlet passage; in one embodiment, the second sphere 402 is made of steel.

[0046] When the piston assembly 20 drives the first elastic adjusting member 30 to move along the first direction X to a specified position, the first sphere 303 on the first elastic adjusting member 30 contacts the third limit surface 2011 on the piston assembly 20, so that the liquid inlet passage inside the piston assembly 20 is in a closed state. At this time, the oil pressure in the cavity of the pump body 10 pushes the second elastic adjusting member 40 to move along the first direction X, and the liquid outlet passage in the pump body 10 is in an open state.

[0047] When there is no more oil flowing out of the liquid outlet hole R on the pump body 10, the second elastic adjusting member 40 moves in the direction opposite to the first direction X under the elastic force of the second spring 401. At this time, the liquid outlet passage in the pump body 10 is in a closed state, and the elastic force of the first spring 302 on the first elastic adjusting member 30 pushes the piston assembly 20 to move in the direction opposite to the first direction X to a specified position. At this time, the first ball 303 on the first elastic adjusting member 30 is separated from the third limiting surface 2011 on the piston assembly 20, so that the liquid inlet passage inside the piston assembly 20 is in an open state.

[0048] In one embodiment, as Figure 1 shown, a control valve is provided. The control valve includes no less than two split hydraulic pressure building components 70 mentioned in the above embodiments. Different flow performance can be achieved by adjusting the size of the piston 201 and the number of the split hydraulic pressure building components 70 to reach the required pressure building rate. At least a part of the split hydraulic pressure building components 70 are symmetrically arranged on both sides of the central axis of the control valve. The control valve further includes:

[0049] A valve body 50 having a cavity extending in the length direction and a liquid inlet passage and a liquid outlet passage communicating with the cavity. All the split hydraulic pressure building components 70 are arranged in the cavity of the valve body 50;

[0050] A motor 60 is arranged at the center of the control valve, and the ends of all the piston assemblies 20 are connected to the eccentric shaft of the motor 60.

[0051] In one embodiment, as Figure 1 the control valve includes two split hydraulic pressure building components 70 symmetrically arranged along the central axis of the control valve. The two split hydraulic pressure building components 70 are both arranged in the cavity of the valve body 50. The liquid inlet passage on the valve body 50 communicates with the liquid inlet hole P on the piston seat, and the liquid outlet passage on the valve body 50 communicates with the liquid outlet hole R on the pump body 10. The pump bodies 10 of the two split hydraulic pressure building components 70 are in interference fit with the inner side wall of the valve body 50. The piston rods 203 of the two split hydraulic pressure building components 70 are both connected to the eccentric shaft of the motor 60. Second sealing rings 205 are installed between the piston seats 202 of the two split hydraulic pressure building components 70 and the bottom of the cavity of the valve body 50, and the second sealing rings 205 are sleeved on the outer side wall of the piston rods 203 to filter foreign matters in the front section of the piston rods 203, prevent foreign matters from entering the cavity of the piston 201 and causing structural failure, and can also play a sealing role. In one embodiment, the second sealing ring 205 is an O-ring, and can also be replaced by a sealing structure made of other materials resistant to hydraulic oil and wear-resistant, such as leather cups, rectangular rings, oil seals, etc.

[0052] When the motor 60 operates, the eccentric shaft of the motor 60 controls the piston assembly 20 of the split-type hydraulic pressure building assembly 70 on the right side to move along the first direction X, while the piston assembly 20 of the split-type hydraulic pressure building assembly 70 on the left side moves in the opposite direction of the first direction X under the elastic force of the corresponding first elastic adjustment member 30. The piston assembly 20 and the first spring 302 on the corresponding first elastic adjustment member 30 move to a specified position along the first direction X or the opposite direction of the first direction X. At this time, the liquid inlet passage inside the piston assembly 20 moving along the first direction X is in a closed state, while the liquid outlet passage inside the corresponding pump body 10 is in an open state. The liquid inlet passage inside the piston assembly 20 moving in the opposite direction of the first direction X is in an open state, while the liquid outlet passage inside the corresponding pump body 10 is in a closed state.

[0053] In one embodiment, a wire control braking system is proposed, and the wire control braking system includes the control valve mentioned in the above embodiment.

[0054] The piston 201 of the split-type hydraulic pressure building assembly 70 provided by the present utility model cancels the spring, thereby making the internal structure of the entire split-type hydraulic pressure building assembly compact and occupying less space. The split-type hydraulic pressure building assembly 70 can be assembled into a component assembly unit externally and directly pressed into the control valve, making it more convenient to use. The piston 201 and the piston rod 203 are connected by a split-type structure, and the piston rod 203 with more suitable hardness, heat treatment, etc. can be selected separately without affecting the accuracy of the piston 201. The split-type hydraulic pressure building assembly 70 has higher pressure building efficiency, longer service life and higher reliability, and can quickly provide the required liquid pressure for the pipeline in the wire control braking system EHB to meet the braking force building requirements of the whole vehicle. At the same time, the accuracy requirements for the processing of parts are relatively low, which greatly reduces the production cost of the enterprise.

[0055] The above are only the preferred embodiments of one or more embodiments of this specification, and are not intended to limit one or more embodiments of this specification. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of one or more embodiments of this specification shall be included within the protection scope of one or more embodiments of this specification.

Claims

1. Split hydraulic pressure building component, characterized in that: include: A pump body having a cavity extending along an axial direction and a liquid outlet hole communicating with the cavity; A piston assembly having a cavity extending in the axial direction and a liquid inlet hole communicating with the cavity, wherein at least a portion of the piston assembly is disposed in the cavity of the pump body and slides reciprocatingly in the axial direction; A first elastic adjusting member, which is arranged in the cavity formed by the piston assembly and the pump body and at least a part of which is arranged in the piston assembly, and the first elastic adjusting member serves as a switch for connecting the liquid inlet channel in the control valve and the motion cavity of the piston assembly; A second elastic adjusting member is arranged on the sealing portion of the right end portion of the pump body, and the second elastic adjusting member serves as a switch for connecting the movement cavity of the piston assembly with the liquid outlet channel in the control valve; Wherein, the direction in which the length of the pump body is extended is the first direction.

2. The split type hydraulic pressure building assembly according to claim 1 is characterized in that: When the piston assembly drives the first elastic adjusting member to move along the first direction to a specified position, at least a portion of the first elastic adjusting member contacts the inner wall of the piston assembly, so that the oil inlet passage inside the piston assembly is in a closed state. At this time, the oil pressure in the cavity of the pump body pushes the second elastic adjusting member to move along the first direction, and the oil outlet passage in the pump body is in an open state.

3. The split type hydraulic pressure building assembly according to claim 1 is characterized in that: When oil no longer flows out of the liquid outlet hole on the pump body, the second elastic adjusting member moves in the opposite direction to the first direction under the elastic force. At this time, the oil outlet passage in the pump body is in a closed state. The elastic force of the first elastic adjusting member pushes the piston assembly to move in the opposite direction to the first direction to a specified position. At this time, at least a portion of the first elastic adjusting member is separated from the inner wall of the piston assembly, so that the oil inlet passage inside the piston assembly is in an open state.

4. The split type hydraulic pressure building assembly according to claim 1, characterized in that: The piston assembly comprises: A piston capable of reciprocating and sliding in a first direction, disposed in the pump body and having a cavity extending in a length direction; A piston seat having a cavity extending along the axial direction and a liquid inlet hole communicating with the cavity, which is sleeved on the outer wall of the left end of the piston and connected to the left end of the pump body; A detachable piston rod passes through a through hole in the center of the piston and is connected to the left end of the piston.

5. The split type hydraulic pressure building assembly according to claim 1, characterized in that: The first elastic adjusting member comprises: A spring support cover having a plurality of through holes is arranged on the right end surface of the piston and is used for returning the piston; A first spring, disposed in the cavity of the pump body, with one end connected to the spring support cover and the other end connected to the inner side wall of the pump body; The first sphere is arranged in the cavity formed by the piston and the spring support cover, and serves as a switch for connecting the liquid inlet channel in the control valve and the movement cavity of the piston.

6. The split type hydraulic pressure building assembly according to claim 1, characterized in that: The second elastic adjusting member comprises: a second spring, disposed in a groove of the sealing portion of the pump body; The second ball is arranged in the groove of the sealing part of the pump body and at the end of the second spring, and serves as a switch for connecting the movement cavity of the piston assembly with the liquid outlet channel in the control valve.

7. A control valve, characterized in that: The invention comprises at least two split hydraulic pressure building assemblies as described in claim 1, at least a part of the split hydraulic pressure building assemblies are symmetrically arranged on both sides of the central axis of the control valve, and further comprises: A valve body having a cavity extending in the length direction and a liquid inlet channel and a liquid outlet channel connected to the cavity, wherein all the split-type hydraulic pressure building components are arranged in the cavity of the valve body; The motor is arranged at the center of the control valve, and ends of all the piston assemblies are in contact with the eccentric shaft of the motor.

8. The control valve according to claim 7, characterized in that: When the motor is working, the eccentric shaft of the motor controls the piston assembly of one of the split hydraulic pressure building assemblies to move along the first direction, while the piston assembly of the other split hydraulic pressure building assembly moves in the opposite direction to the first direction under the elastic force of the corresponding first elastic adjusting member, and the piston assembly and the corresponding first elastic adjusting member move to a specified position in the first direction or in the opposite direction to the first direction. At this time, the oil inlet passage inside the piston assembly moving along the first direction is in a closed state and the corresponding oil outlet passage in the pump body is in an open state, and the oil inlet passage inside the piston assembly moving in the opposite direction to the first direction is in an open state and the corresponding oil outlet passage in the pump body is in a closed state.

9. A brake-by-wire system, characterized in that: Comprising the control valve according to claim 7 or 8.

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