Pressure buildup unit valve block runner design structure

Abstract

The utility model relates to the technical field of electronic hydraulic braking, and discloses a pressure buildup unit valve block runner design structure which comprises a valve body and a cavity penetrating through the valve body, the cavity comprises an outer cavity connected with a piston in a sliding mode and an inner cavity used for pressure buildup, and the valve body is communicated with the inner cavity and provided with a hydraulic runner. A first sealing groove, a liquid supplementing groove and a second sealing groove are sequentially formed in the inner wall of the outer cavity, and the valve body is communicated with the liquid supplementing groove and provided with a liquid supplementing pressure relief flow channel. Through the mode that the liquid supplementing groove is formed between the first sealing groove and the second sealing groove of the outer cavity, in the process that the piston returns to the zero position, the liquid supplementing pressure relief flow channel and the inner cavity can be communicated, effective pressure relief of residual pressure of the inner cavity when the piston returns to the zero position is effectively achieved, and the precision of returning to the zero position of the piston is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic hydraulic braking, in particular to a flow channel design structure of a pressure-building unit valve block. Background Art

[0002] The braking system is an important assembly system for active vehicle safety, and its reliability is one of the important indicators of the braking system. The existing automobile braking system is mainly based on the electronic hydraulic braking system. Compared with traditional hydraulic braking, the electronic hydraulic braking system has significant advantages in braking sensitivity, response speed and braking force.

[0003] The basic principle of the existing integrated electronic hydraulic braking system is that the ECU (electronic control unit) transmits the pressure building signal to the pressure building unit according to the pedal simulator signal. The pressure building unit mainly includes a pressure building motor and a pressure building cylinder. The pressure building motor pushes the piston to move in the pressure building cylinder through the transmission structure to build pressure. The pressure building unit distributes braking force to the target wheel brake pump through the oil circuit and solenoid valve to achieve braking.

[0004] During the operation of the braking system, since the brake fluid can be compensated through the oil tank, it is difficult to avoid excessive compensation. At this time, when the pressure-building piston retreats to its initial position, there is still residual fluid pressure in the brake circuit, which prevents the piston from returning completely to zero position. There will be residual pressure in the pressure-building chamber, causing the braking system to be unable to brake accurately, affecting driving safety. Utility Model Content

[0005] The purpose of the utility model is to provide a flow channel design structure of a pressure-building unit valve block, so that the residual pressure in the inner cavity can be effectively released during the process of the piston returning to zero position, thereby improving the accuracy of the piston returning to zero position.

[0006] In order to solve the above technical problems, the embodiment of the present utility model provides a technical solution as follows:

[0007] A pressure-building unit valve block flow channel design structure includes a valve body and a cavity arranged through the valve body, the cavity includes an outer cavity slidingly connected to a piston and an inner cavity for building pressure, the valve body is connected to the inner cavity and is provided with a hydraulic flow channel, the inner wall of the outer cavity is sequentially provided with a first sealing groove, a fluid replenishment groove and a second sealing groove, and the valve body is connected to the fluid replenishment groove and is provided with a fluid replenishment pressure relief flow channel.

[0008] Furthermore, the fluid replenishing groove is an annular groove, and the fluid replenishing groove includes a bottom wall, a first side wall extending obtusely along the edge of the bottom wall, and a second side wall extending vertically along the edge of the bottom wall.

[0009] Furthermore, a guide port is provided at a position corresponding to the second side wall and the fluid-infusion pressure-relief flow channel, and the fluid-infusion pressure-relief flow channel is in continuous connection with the guide port and the bottom wall.

[0010] Furthermore, the fluid infusion and pressure relief channel is arranged obliquely relative to the central axis of the cavity.

[0011] Furthermore, the guide port is an open arc-shaped gap.

[0012] Furthermore, the first sealing groove and the second sealing groove are provided with sealing rings, and the sealing rings can seal the gap between the piston and the outer cavity.

[0013] Furthermore, the sealing ring is a leather cup.

[0014] Furthermore, a piston fluid replenishing hole is provided at one end of the piston facing the inner cavity, and the piston fluid replenishing hole can be connected with the fluid replenishing groove to connect the fluid replenishing pressure relief channel and the inner cavity.

[0015] Furthermore, when the piston moves toward the inner cavity, the piston fluid replenishment hole can be sealed by the sealing ring to isolate the fluid replenishment pressure relief channel from the inner cavity.

[0016] Furthermore, when the piston moves toward the outer cavity, the piston fluid replenishment hole can correspond axially to the fluid replenishment groove, connecting the fluid replenishment pressure relief channel and the inner cavity.

[0017] The utility model provides a pressure-building unit valve block flow channel design structure, which, by arranging a fluid replenishing groove between the first sealing groove and the second sealing groove of the outer cavity, can connect the fluid replenishing and pressure relief flow channel with the inner cavity during the process of the piston returning to zero position, thereby effectively realizing the effective pressure relief of the residual pressure in the inner cavity when the piston returns to zero position, and improving the accuracy of the piston returning to zero position; by setting the guide ports corresponding to the fluid replenishing groove and the fluid replenishing and pressure relief flow channel, the contact area between the liquid and the piston is effectively increased, and the smoothness of the sliding connection between the piston and the outer cavity is increased. At the same time, by setting the guide ports, the process difficulty of manufacturing the fluid replenishing and pressure relief flow channel is reduced, and the surface treatment process of the fluid replenishing and pressure relief flow channel port can be implemented more conveniently, thereby increasing the fluidity of the liquid between the fluid replenishing and pressure relief flow channel and the fluid replenishing groove, which is conducive to further improving the accuracy of the piston returning to zero position. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0019] Figure 1 This is a schematic diagram of the combined structure of the valve block and the piston in one embodiment of the utility model;

[0020] Figure 2 This is a schematic diagram of the three-dimensional structure of the valve block in one embodiment of the utility model;

[0021] Figure 3 This is a front view of a valve block in one embodiment of the present utility model;

[0022] Figure 4 It is attached Figure 3 Middle AA section view;

[0023] Figure 5 This is a front view of a valve block in one embodiment of the present utility model;

[0024] Figure 6 It is attached Figure 5 Middle BB cross-section;

[0025] Figure 7 This is a three-dimensional cross-sectional view of a valve block in one embodiment of the present utility model;

[0026] Figure 8 It is attached Figure 7 A partial enlarged view of point C in the middle.

[0027] Explanation of the accompanying reference numerals: 10. Valve block; 1. Valve body; 2. Cavity; 11. Outer cavity; 12. Inner cavity; 13. Hydraulic channel; 14. First sealing groove; 15. Fluid replenishment groove; 151. Guide port; 152. Bottom wall; 153. First side wall; 154. Second side wall; 16. Second sealing groove; 17. Fluid replenishment and pressure relief channel; 20. Piston; 21. Piston fluid replenishment hole; 30. Sealing ring. DETAILED DESCRIPTION

[0028] To make the objectives, technical solutions, and advantages of the present invention more clearly apparent, various embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will appreciate that many technical details are provided in various embodiments of the present invention to facilitate a better understanding of the present application. However, even without these technical details and the various variations and modifications based on the following embodiments, the technical solutions claimed in the claims of this application can be achieved.

[0029] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0030] like Figure 1As shown, in one embodiment provided by the present invention, it relates to a flow channel design structure of a pressure building unit valve block 10, including a valve body 1 and a cavity 2 arranged through the valve body 1, the cavity 2 including an outer cavity 11 slidably connected to the piston 20 and an inner cavity 12 for building pressure, the valve body 1 is connected to the inner cavity 12 and is provided with a hydraulic flow channel 13, the inner wall of the outer cavity 11 is sequentially provided with a first sealing groove 14, a fluid replenishment groove 15 and a second sealing groove 16, the valve body 1 is connected to the fluid replenishment groove 15 and is provided with a fluid replenishment pressure relief flow channel 17, the hydraulic flow channel 13 and the fluid replenishment pressure relief flow channel 17 are arranged in the same plane, a sealing ring 30 is provided between the piston 20 and the outer cavity 11, and the sealing ring 30 is arranged in the first sealing groove 14 and the second sealing groove 16.

[0031] In another embodiment provided by the present invention, Figure 2-6 The figure shows a pressure-building unit valve block 10. The valve block 10 includes a valve body 1 and a cavity 2 extending through the valve body 1. The cavity 2 includes an outer cavity 11 slidably connected to a piston 20 and an inner cavity 12 for pressure building. The hydraulic channel 13 and the fluid-injection pressure-relief channel 17 are located in different planes.

[0032] The valve body 1 is connected to the inner cavity 12 and is provided with a hydraulic channel 13. The piston 20 moves toward the inner cavity 12 to apply pressure to the liquid in the inner cavity 12. The liquid in the inner cavity 12 flows out through the hydraulic channel 13 to generate the hydraulic braking force required by the braking system.

[0033] The inner wall of the outer chamber 11 is sequentially provided with a first sealing groove 14, a fluid replenishing groove 15, and a second sealing groove 16. The first sealing groove 14, the fluid replenishing groove 15, and the second sealing groove 16 are all annular grooves. The first sealing groove 14 and the second sealing groove 16 are used to set a sealing ring 30. The sealing ring 30 can seal the gap between the outer chamber 11 and the piston 20 to prevent liquid leakage. Preferably, the sealing ring 30 is a leather cup.

[0034] In one embodiment, Figure 7-8 As shown, the fluid infusion tank 15 is provided with an annular bottom wall 152, and a first side wall 153 and a second side wall 154 are extended in the same direction at both ends of the bottom wall 152. The first side wall 153 is extended outwardly along the edge of the bottom wall 152, that is, the first side wall 153 and the cross-section of the bottom wall 152 are set at an obtuse angle, and the second side wall 154 is set perpendicular to the bottom wall 152. Of course, according to the production process requirements, a chamfered surface is provided at the junction of the first side wall 153 and the bottom wall 152, and a chamfered surface is provided at the junction of the second side wall 154 and the bottom wall 152.

[0035] The valve body 1 is connected to the fluid replenishment tank 15 and is provided with a fluid replenishment pressure relief channel 17. One end of the fluid replenishment pressure relief channel 17 is connected to a fluid storage tank (not shown in the drawings) and the other end is connected to the fluid replenishment tank 15. The end of the piston 20 extending into the outer cavity 11 is provided with a through piston fluid replenishment hole 21. The piston fluid replenishment hole 21 can connect the fluid replenishment tank 15 with the inner cavity 12, thereby allowing the liquid in the fluid storage tank to flow into the inner cavity 12, ensuring sufficient liquid in the inner cavity 12. The residual pressure in the inner cavity 12 can be released to the fluid replenishment pressure relief channel 17 through the piston fluid replenishment hole 21.

[0036] Preferably, the port of the fluid infusion and pressure relief channel 17 is through-set on the bottom wall 152, and the accommodating space defined between the first side wall 153, the second side wall 154 and the bottom wall 152 can provide a buffer space for the fluid injection of the fluid infusion and pressure relief channel 17, thereby improving the smoothness and efficiency of fluid infusion; at the same time, the setting of the fluid infusion groove 15 can effectively increase the contact area between the liquid and the piston 20, and increase the smoothness of the sliding connection between the piston 20 and the outer cavity 11.

[0037] In one embodiment, a guide port 151 is provided at a position corresponding to the second side wall 154 and the fluid replenishment pressure relief flow channel 17. The guide port 151 is an open arc-shaped notch. Preferably, the fluid pressure relief flow channel is partially connected to the guide port 151. The provision of the guide port 151 is beneficial to the diffusion of the liquid in the fluid replenishment tank 15 along the surface of the piston 20, increasing the contact area between the liquid and the piston 20, and further increasing the smoothness of the sliding connection between the piston 20 and the outer cavity 11. On the other hand, the provision of the guide port 151 reduces the process difficulty of manufacturing the fluid replenishment pressure relief flow channel 17, and can more conveniently use tools to perform surface treatment on the port of the fluid replenishment pressure relief flow channel 17 facing the piston 20, including but not limited to burr removal, chamfering, etc., to increase the smoothness of the liquid flowing between the fluid replenishment tank 15 and the fluid replenishment pressure relief flow channel 17, which is beneficial to further improve the accuracy of the piston 20 returning to zero.

[0038] In one embodiment, two hydraulic channels 13 are symmetrically disposed on the valve block 10, and the two hydraulic channels 13 are symmetrically arranged along the cavity 2. There is one fluid-inflation and pressure-relief channel 17, and the fluid-inflation and pressure-relief channel 17 is disposed perpendicular to the central axis of the cavity 2 or inclined relative to the central axis of the cavity 2. The number of hydraulic channels 13 and fluid-inflation and pressure-relief channels 17 can be increased or decreased as necessary based on actual operating requirements.

[0039] During use, the pressure-building unit activates the drive motor according to the pressure-building signal from the virtual pedal. Driven by the drive motor, the piston 20 moves toward the inner cavity 12. The piston's fluid-filling hole 21 corresponds to and is sealed by the sealing ring 30, isolating and sealing the fluid-filling and pressure-relief flow channel 17 from the inner cavity 12. Under pressure, the fluid in the inner cavity 12 flows through the hydraulic channel 13 and the solenoid valve to the oil outlet. The fluid then distributes the braking force to the target wheel brake pump through the oil circuit and the solenoid valve to achieve braking. When braking force is no longer required, the piston 20 needs to return to its zero position. During this process, the piston 20's fluid-filling hole 21 communicates with the fluid-filling and pressure-relief flow channel 17. The residual pressure in the inner cavity 12 can be discharged from the piston's fluid-filling hole 21 to the fluid-filling and pressure-relief flow channel 17, thereby allowing the piston 20 to reach a balanced state between the hydraulic pressures of the inner cavity 12 and the outer cavity 11, avoiding the influence of the residual pressure in the inner cavity 12 and allowing the piston 20 to return to its zero position normally. This allows the piston 20 to accurately transmit and quickly respond to the braking force requirement when braking is required again.

[0040] The utility model provides a pressure-building unit valve block flow channel design structure, which, by arranging a fluid replenishing groove between the first sealing groove and the second sealing groove of the outer cavity, can connect the fluid replenishing and pressure relief flow channel with the inner cavity during the process of the piston returning to zero position, thereby effectively realizing the effective pressure relief of the residual pressure in the inner cavity when the piston returns to zero position, and improving the accuracy of the piston returning to zero position; by setting the guide ports corresponding to the fluid replenishing groove and the fluid replenishing and pressure relief flow channel, the contact area between the liquid and the piston is effectively increased, and the smoothness of the sliding connection between the piston and the outer cavity is increased. At the same time, by setting the guide ports, the process difficulty of manufacturing the fluid replenishing and pressure relief flow channel is reduced, and the surface treatment process of the fluid replenishing and pressure relief flow channel port can be implemented more conveniently, thereby increasing the fluidity of the liquid between the fluid replenishing and pressure relief flow channel and the fluid replenishing groove, which is conducive to further improving the accuracy of the piston returning to zero position.

[0041] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A pressure-building unit valve block flow channel design structure, characterized in that: The invention comprises a valve body (1) and a cavity (2) provided through the valve body (1), wherein the cavity (2) comprises an outer cavity (11) slidably connected to a piston (20) and an inner cavity (12) for building up pressure, wherein the valve body (1) is connected to the inner cavity (12) and is provided with a hydraulic flow channel (13), wherein the inner wall of the outer cavity (11) is provided with a first sealing groove (14), a fluid replenishing groove (15) and a second sealing groove (16) in sequence, and wherein the valve body (1) is connected to the fluid replenishing groove (15) and is provided with a fluid replenishing pressure relief flow channel (17).

2. The pressure building unit valve block flow channel design structure according to claim 1 is characterized in that: The fluid replenishing groove (15) is an annular groove, and the fluid replenishing groove (15) comprises a bottom wall (152), a first side wall (153) extending along the edge of the bottom wall (152) at an obtuse angle, and a second side wall (154) extending vertically along the edge of the bottom wall (152).

3. The pressure building unit valve block flow channel design structure according to claim 2 is characterized in that: A guide port (151) is provided at a position corresponding to the second side wall (154) and the fluid-infusion pressure-relief flow channel (17); the fluid-infusion pressure-relief flow channel (17) is connected to the guide port (151) and the bottom wall (152).

4. The pressure building unit valve block flow channel design structure according to claim 3 is characterized in that: The fluid replenishment and pressure relief flow channel (17) is arranged obliquely relative to the central axis of the cavity (2).

5. The pressure building unit valve block flow channel design structure according to claim 3 is characterized in that: The guide port (151) is an open arc-shaped notch.

6. The pressure building unit valve block flow channel design structure according to claim 1, characterized in that: The first sealing groove (14) and the second sealing groove (16) are provided with sealing rings (30), and the sealing rings (30) are capable of sealing the gap between the piston (20) and the outer cavity (11).

7. The pressure building unit valve block flow channel design structure according to claim 6, characterized in that: The sealing ring (30) is a leather cup.

8. The pressure building unit valve block flow channel design structure according to claim 6, characterized in that: The piston (20) is provided with a piston fluid replenishment hole (21) at one end facing the inner cavity (12), and the piston fluid replenishment hole (21) can be connected to the fluid replenishment pressure relief channel (17) and the inner cavity (12) corresponding to the fluid replenishment groove (15).

9. The pressure building unit valve block flow channel design structure according to claim 8, characterized in that: When the piston (20) moves toward the inner cavity (12), the piston fluid replenishment hole (21) can be sealed by the sealing ring (30), isolating the fluid replenishment pressure relief channel (17) from the inner cavity (12).

10. The pressure building unit valve block flow channel design structure according to claim 8, characterized in that: When the piston (20) moves toward the outer cavity (11), the piston fluid replenishment hole (21) can correspond axially to the fluid replenishment groove (15), connecting the fluid replenishment pressure relief channel (17) and the inner cavity (12).

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