A piston structure and a braking system
By designing a piston structure with multiple channels and transition areas, the problem of non-linear displacement and pressure during the pressure relief process in the prior art is solved, and the stable displacement and linear pressure change of the piston are achieved, and the pedal sense and adjustment of the high-pressure chamber pressure is improved.
Patent Information
- Application Number
- CN202421708444.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-18
- Publication Date
- 2025-04-08
- Estimated Expiration
- 2034-07-18
AI Technical Summary
During the pressure relief process of the existing vehicle line-controlled pressure construction plan, when the liquid discharge hole passes through the leather bowl, the brake fluid in the high-pressure chamber suddenly flows into the low-pressure chamber, resulting in the displacement of the piston being not linear with the pressure, affecting the pedal sense and the regulation of the pressure in the high-pressure chamber.
A piston structure is designed, including a plurality of channels for fluid to pass through. One end of the channel is opened on the end surface of one end of the piston and the other end is opened on the outer circumferential side wall of the piston to form a transition area. The flow rate gradually decreases within a unit time to ensure that the displacement of the piston is linear with the pressure change.
Through the design of multiple transition areas, the piston is smoothly displaced and linear pressure changes during the pressure relief process, and the adjustment accuracy of pedal sense and high-pressure chamber pressure are improved.
Smart Images
Figure CN222732004U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of vehicle braking systems, in particular to a piston structure and a braking system. Background Art
[0002] The piston of the existing vehicle wire-controlled pressure-building solution has only one row of drainage holes in its structure. When the piston is in the process of relieving pressure, the drainage holes pass through the leather cup, and the brake fluid in the high-pressure chamber suddenly flows into the low-pressure chamber through the drainage holes, causing the displacement of the piston and the pressure to be non-linear, thereby affecting the pedal feel and the regulation of the high-pressure chamber pressure. Utility Model Content
[0003] In view of the above problems existing in the prior art, the utility model provides a piston structure and a braking system.
[0004] In order to solve the above technical problems, the utility model is solved by the following technical solutions:
[0005] In a first aspect, a piston structure is provided, comprising a plurality of channels through which fluid can pass, wherein one end of the channel opens on an end surface of one end of the piston, and the other end opens on a circumferential outer side wall of the piston;
[0006] The opening at the other end of the channel on the same plane perpendicular to the axial direction of the piston constitutes a transition area, and the flow rate of the fluid passing through the transition area closer to the other end of the piston tends to gradually decrease per unit time.
[0007] Preferably, the transition region closer to the other end of the piston is formed by a smaller number of the channels.
[0008] Preferably, the transition region closer to the other end of the piston is formed by the channel with a smaller aperture.
[0009] Preferably, at least some of the channels in at least some of the transition areas are connected to each other through openings on the circumferential outer side wall of the piston.
[0010] Preferably, at least a portion of the opening at the other end of the channel is tapered in a direction toward the other end close to the piston.
[0011] Preferably, the opening at the other end of the channel is at least one of circular, triangular and trapezoidal.
[0012] Preferably, an accommodating cavity is provided on an end surface of one end of the piston, and one end of the channel is communicated with the accommodating cavity.
[0013] In a second aspect, a brake system is provided, comprising a brake cylinder and the above-mentioned piston structure; the brake cylinder is provided with a high-pressure chamber and a low-pressure chamber which are interconnected, and the diameter of the low-pressure chamber is larger than the diameter of the high-pressure chamber;
[0014] One end of the piston can extend from the low-pressure chamber into the high-pressure chamber, and the pressure building or pressure relief of the brake cylinder can be achieved through the movement of the piston inside the brake cylinder.
[0015] Preferably, a sealing member is provided on the circumferential inner wall of the high-pressure chamber and / or the low-pressure chamber;
[0016] When the piston passes through the sealing member, the sealing member is deformed under pressure to isolate the high-pressure chamber from the low-pressure chamber.
[0017] Preferably, the sealing member is a leather cup, and the leather cup is fixedly mounted on the circumferential inner wall of the high-pressure chamber and / or the low-pressure chamber by at least one of bolt fixing, adhesive fixing and clamping fixing.
[0018] The utility model has at least the following beneficial effects:
[0019] In the present application, multiple transition areas can be arranged in sequence in the axial direction of the piston. In the process of the piston moving toward the outside of the active cavity and moving out of the active cavity, the transition area closest to the other end of the piston will move out of the active cavity first, and the transition areas arranged later will move out of the active cavity in sequence. As the number of transition areas moving out of the active cavity gradually increases, the flow rate of the fluid flowing out of the active cavity through the channel to the outside of the active cavity in unit time gradually increases, so that the flow rate can change linearly, that is, the displacement of the piston can be linearly changed with the pressure change inside and outside the active cavity, so that the piston can be moved out of the active cavity more smoothly, which can give a good feedback to the entire mechanism or the operating staff. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 A partial cross-sectional view of the piston and the assembly after being matched in some embodiments of the present application is shown;
[0021] Figure 2 A partial schematic diagram of a piston in some embodiments of the present application is shown;
[0022] Figure 3 A first expanded view of the circumferential outer side wall of one end of the piston in some embodiments of the present application is shown, wherein the transition area closer to the other end of the piston is composed of a smaller number of channels;
[0023] Figure 4A second development view of the circumferential outer side wall of one end of the piston in some embodiments of the present application is shown, wherein the transition area closer to the other end of the piston is composed of a smaller number of channels;
[0024] Figure 5 A third development view of the circumferential outer side wall of one end of the piston in some embodiments of the present application is shown, wherein the transition area closer to the other end of the piston is composed of a channel with a smaller aperture;
[0025] Figure 6 A fourth development view of the circumferential outer side wall of one end of the piston in some embodiments of the present application is shown, wherein the transition area closer to the other end of the piston is composed of a smaller number of channels, and some through holes in some transition areas are connected;
[0026] Figure 7 A fifth development view of the circumferential outer side wall of one end of the piston in some embodiments of the present application is shown, wherein the transition area closer to the other end of the piston is composed of a channel with a smaller aperture, and some through holes in some transition areas are connected;
[0027] Figure 8 A sixth development view of the circumferential outer side wall of one end of the piston in some embodiments of the present application is shown, wherein the opening of the other end of the channel is in a gradually narrowing shape in a direction toward the other end of the piston;
[0028] Fig. 9 A partial cross-sectional view of the piston and the brake cylinder after matching in some embodiments of the present application is shown.
[0029] The parts indicated by the numbers in the accompanying drawings are as follows:
[0030] 10. Brake cylinder; 11. High-pressure chamber; 12. Low-pressure chamber; 20. Seal; 21. Snap-in groove; 100. Assembly; 110. Active chamber; 120. Flow channel; 200. Piston; 210. Channel; 220. Accommodating chamber; 300. Transition area. DETAILED DESCRIPTION
[0031] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments are only used to explain the utility model but not to limit it.
[0032] Example 1
[0033] Usually, the piston 200 needs to be used in conjunction with a component 100, which is provided with an active chamber 110 with one end open, and a flow channel 120 connected to the active chamber 110. One end of the piston 200 can extend into the active chamber 110 and reciprocate in the active chamber 110. When the piston 200 moves deeply into the active chamber 110, the piston 200 can compress the fluid in the active chamber 110 and squeeze it into the flow channel 120, such as gas or liquid. When the piston 200 moves toward the outside of the active chamber 110 and moves out of the active chamber 110, since the environment in the active chamber 110 is higher than the external environment, the displacement of the piston 200 when the piston 200 moves out of the active chamber 110 cannot maintain a linear relationship with the pressure.
[0034] In view of the above problems, combined with Figure 1-8 As shown, a piston structure is provided in this embodiment, which includes a plurality of channels 210 for fluid to pass through, one end of the channel 210 extends to one end of the piston 200 and opens on the end surface of the one end of the piston 200, and the other end of the channel 210 extends to the circumferential outer wall of the piston 200 and opens on the circumferential outer wall of the piston 200. When the piston 200 is used in conjunction with the assembly 100, the circumferential outer wall of the piston 200 can keep in contact with the circumferential inner wall of the active cavity 110; when the piston 200 moves deeper into the active cavity 110, the circumferential inner wall of the active cavity 110 can block the opening of the other end of the channel 210 to a certain extent, thereby enabling the piston 200 to compress the fluid in the active cavity 110 and squeeze it into the flow channel 120; when the piston 200 moves toward the outside of the active cavity 110 and moves out of the active cavity 110, during this process, the opening at the other end of the channel 210 on the circumferential outer wall of the piston 200 can be moved out of the active chamber 110 earlier than the end of one end of the piston 200, so that the fluid in the active chamber 110 can enter the interior of the piston 200 through one end of the channel 210, and the fluid then flows out of the piston 200 through the other end of the channel 210, so that the pressure in the active chamber 110 can gradually maintain equilibrium with the outside, thereby facilitating the piston 200 to be moved out of the active chamber 110.
[0035] Furthermore, the opening at the other end of the channel 210 on the circumferential outer side wall of the piston 200 can constitute at least one transition area 300, and the transition area 300 includes the opening at the other end of at least one channel 210, and the openings at the other ends of these channels 210 constituting the same transition area 300 are all located on the same plane perpendicular to the axial direction of the piston 200. Among the multiple transition areas 300, the transition area 300 closer to the other end of the piston 200 has a gradually decreasing flow rate for the fluid passing through per unit time.
[0036] It should be noted here that the unit time may be any specified time period, and the flow rate of the fluid passing through the channel 210 in the transition area 300 closer to the other end of the piston 200 gradually decreases within the specified time period.
[0037] It is understandable that a plurality of transition regions 300 can be arranged in sequence in the axial direction of the piston 200. In the process of the piston 200 moving toward the outside of the active chamber 110 and moving out of the active chamber 110, the transition region 300 closest to the other end of the piston 200 will move out of the active chamber 110 first, and the transition regions 300 arranged later will move out of the active chamber 110 in sequence. As the number of transition regions 300 moving out of the active chamber 110 gradually increases, the flow rate of the fluid that can flow out of the active chamber 110 to the outside of the active chamber 110 through the channel 210 per unit time gradually increases, so that the flow rate can change linearly, that is, the displacement of the piston 200 can be linearly changed with the pressure change inside and outside the active chamber 110, so that the piston 200 can be moved out of the active chamber 110 relatively smoothly, which can give a good feedback to the entire mechanism or the operating staff.
[0038] Combination Figure 3-4 , Figure 6 and Figure 8 As shown, in some embodiments, the transition region 300 closer to the other end of the piston 200 is composed of fewer channels 210 , that is, the transition region 300 closer to the other end of the piston 200 is composed of fewer openings at the other end of the channels 210 .
[0039] It can be understood that, on the basis of maintaining the same aperture of the channel 210 , the fewer the number of channels 210 constituting the same transition region 300 , the smaller the flow rate that can be provided for the fluid to pass through the transition region 300 per unit time.
[0040] When the piston 200 moves toward the outside of the active chamber 110 and moves out of the active chamber 110, the transition area 300 including a smaller number of channels 210 moves out of the active chamber 110 first, so that the fluid in the active chamber 110 flows out of the active chamber 110 at a smaller flow rate per unit time, and then the transition areas 300 including a larger number of channels 210 move out of the active chamber 110 in turn, so that the fluid flows out of the active chamber 110 at a trend of gradually increasing flow rate per unit time, thereby better achieving a linear change between the displacement of the piston 200 and the pressure change inside and outside the active chamber 110, so that the piston 200 can be moved out of the active chamber 110 more smoothly, which can give the entire mechanism or operating staff a good feedback.
[0041] Combination Figure 1-2 , Figure 5 and Figure 7As shown, in some embodiments, the transition region 300 closer to the other end of the piston 200 is composed of channels 210 with smaller apertures. It can be understood that when the number of channels 210 included in the transition region 300 remains consistent, the smaller the aperture of the channel 210, the smaller the flow rate that can be provided for the fluid to pass through the corresponding transition region 300 per unit time.
[0042] When the piston 200 moves toward the outside of the active chamber 110 and moves out of the active chamber 110, the transition area 300 including the channel 210 with a smaller aperture moves out of the active chamber 110 first, so that the fluid in the active chamber 110 flows out of the active chamber 110 at a smaller flow rate per unit time, and then the transition areas 300 including the channel 210 with a larger aperture move out of the active chamber 110 in turn, so that the fluid flows out of the active chamber 110 at a trend of gradually increasing flow rate per unit time, thereby better achieving a linear change between the displacement of the piston 200 and the pressure change inside and outside the active chamber 110, so that the piston 200 can be moved out of the active chamber 110 more smoothly, which can give the entire mechanism or operating staff a good feedback.
[0043] Combination Figure 6-7 As shown, in some embodiments, at least a portion of the channels 210 in at least a portion of the transition region 300 are connected to each other through openings on the circumferential outer side wall of the piston 200 .
[0044] It should be noted that the openings at the other ends of the multiple channels 210 may be provided on the circumferential outer side wall of the piston 200 along the axial direction of the piston 200, thereby forming multiple transition regions 300. There are at least two transition regions 300 among the multiple transition regions 300, and the openings at the other ends of the channels 210 included in the two transition regions 300 are interconnected, and of course, they may be partially or fully connected, which is not particularly limited here.
[0045] It can be understood that, since the transition area 300 is moved out of the active chamber 110 one by one during the process of the piston 200 moving toward the outside of the active chamber 110, the connection between any channels 210 in any two transition areas 300 will not affect the linear change of the pressure inside and outside the active chamber 110, and it can also better achieve the linear change of the displacement of the piston 200 and the pressure change inside and outside the active chamber 110, so that the piston 200 can move out of the active chamber 110 more smoothly, which can give a good feedback to the entire mechanism or the operating staff.
[0046] Combination Figure 8 As shown, in some embodiments, at least a portion of the opening at the other end of the channel 210 can be in a gradually narrowing shape in a direction toward the other end close to the piston 200 .
[0047] It can be understood that, in the process of the transition area 300 moving out of the active chamber 110, the opening at the other end of the channel 210 is also gradually moved out of the active chamber 110. During this process, the area of the opening at the other end of the channel 210 leaking out of the active chamber 110 gradually increases, so that the fluid flows out of the active chamber 110 with a trend of gradually increasing flow rate per unit time, thereby better realizing the linear change of the displacement of the piston 200 and the pressure change inside and outside the active chamber 110, so that the piston 200 can move out of the active chamber 110 relatively smoothly, which can give a good feedback to the entire mechanism or operating staff.
[0048] Combination Figure 8 As shown, in some embodiments, the opening at the other end of the channel 210 can be circular, triangular, or trapezoidal, so that the opening at the other end of the channel 210 can be gradually narrowed in the direction toward the other end close to the piston 200. The shapes of the openings at the other ends of different channels 210 can be different or the same, and there is no special limitation on this.
[0049] Combination Figure 1 As shown, in some embodiments, a receiving cavity 220 is opened on the end surface of one end of the piston 200, and one end of the channel 210 arranged on the piston 200 is connected to the receiving cavity 220 to achieve that one end of the channel 210 opens on the end surface of one end of the piston 200.
[0050] It is understandable that the fluid in the active chamber 110 first enters the accommodating chamber 220 and then enters the channel 210 through the accommodating chamber 220 .
[0051] Example 2
[0052] The piston 200 is also used in the existing vehicle wire-controlled pressure building scheme. The piston structure is only provided with a row of drainage holes. When the piston 200 is in the process of relieving pressure, the brake fluid will suddenly flow out through the drainage holes, which will also cause the displacement and pressure of the piston 200 to be non-linear, thereby affecting the pedal feel and the regulation of the pressure in the high-pressure chamber 11.
[0053] In view of the above problems, combined with Figure 2-9 As shown, a brake system is provided in this embodiment, including a brake cylinder 10 and a piston structure provided in Embodiment 1. A high-pressure chamber 11 and a low-pressure chamber 12 are provided inside the brake cylinder 10, and the diameter of the low-pressure chamber 12 is larger than the diameter of the high-pressure chamber 11. When one end of the piston 200 moves from the low-pressure chamber 12 toward the high-pressure chamber 11, the brake cylinder 10 can be pressurized, and when one end of the piston 200 moves from the high-pressure chamber 11 toward the low-pressure chamber 12, the brake cylinder 10 can be depressurized.
[0054] It can be understood that the brake cylinder 10 in this embodiment is the component 100 in Example 1, and the high-pressure chamber 11 is the active chamber 110 in Example 1. Since this embodiment adopts the piston structure in Example 1, it can achieve the corresponding technical effects and advantages of Example 1.
[0055] Furthermore, since the brake fluid in the high-pressure chamber 11 gradually flows into the low-pressure chamber 12 through the channel 210, the pressure and displacement fed back to the piston 200 are more linear, which can provide a better pedal feel; when applied to a structure in which the pressure building of the piston 200 is controlled by a motor, the controller can adjust the pressure of the high-pressure chamber 11 more precisely, and can also reduce the impact of the brake fluid in the high-pressure chamber 11 on the parts in the low-pressure chamber 12.
[0056] In particular, the braking system in this embodiment can be applied to the basic pressure-building structure, such as building pressure to the wheel by stepping on the foot or building pressure to the pedal simulator by stepping on the foot. Its structure can solve the problem of non-linear force and displacement fed back to the pedal during the return process of the piston 200, eliminate the step feeling, and provide a good driving experience. It can also be applied to the structure of power-assisted pressure-building, such as pushing the piston 200 to build pressure to the wheel through a motor and a transmission mechanism. Its structure can solve the problem of the sudden inflow of liquid in the high-pressure chamber 11 into the low-pressure chamber 12 during the return and pressure relief process of the piston 200, resulting in the motor's jitter or imprecise control of the pressure in the high-pressure chamber 11, and play a role in protecting the components in the low-pressure chamber 12.
[0057] In some embodiments, a seal 20 is provided on the circumferential inner wall of the high-pressure chamber 11 and / or the low-pressure chamber 12. When the piston 200 passes through, the piston 200 can squeeze the seal 20, so that the seal 20 can isolate the high-pressure chamber 11 and the low-pressure chamber 12 to better achieve pressure buildup or pressure relief.
[0058] In some embodiments, the seal 20 is a leather cup, which can be fixedly mounted on the circumferential inner wall of the high-pressure chamber 11 and / or the low-pressure chamber 12 by at least one of bolting, bonding, and clamping.
[0059] Furthermore, in the present embodiment, a clamping groove 21 is provided on the circumferential inner side wall of the high pressure chamber 11 , and the leather cup is clamped and fixed in the clamping groove 21 .
[0060] In short, the above is only a preferred embodiment of the present utility model, and all equivalent changes and modifications made according to the scope of the patent application of the present utility model should fall within the scope of the present utility model patent.
Claims
1. A piston structure, characterized in that: The invention comprises a plurality of channels through which fluid can pass, wherein one end of the channel opens on an end surface of one end of the piston, and the other end opens on a circumferential outer side wall of the piston; The opening at the other end of the channel on the same plane perpendicular to the axial direction of the piston constitutes a transition area, and the flow rate of the fluid passing through the transition area closer to the other end of the piston tends to gradually decrease per unit time.
2. The piston structure according to claim 1, characterized in that: The transition region closer to the other end of the piston is formed by a smaller number of the channels.
3. The piston structure according to claim 1 or 2, characterized in that: The transition region closer to the other end of the piston is formed by the passage having a smaller bore.
4. The piston structure according to claim 1, characterized in that: At least some of the passages in at least some of the transition regions are connected to each other through openings on the circumferential outer side wall of the piston.
5. The piston structure according to claim 1, characterized in that: At least a portion of the opening at the other end of the passage is tapered in a direction toward the other end close to the piston.
6. The piston structure according to claim 5, characterized in that: The opening at the other end of the channel is at least one of a circle, a triangle and a trapezoid.
7. The piston structure according to claim 1, characterized in that: An accommodating cavity is provided on an end surface of one end of the piston, and one end of the channel is communicated with the accommodating cavity.
8. A braking system, characterized in that: It comprises a brake cylinder and a piston structure as claimed in any one of claims 1 to 7; the brake cylinder is provided with a high-pressure chamber and a low-pressure chamber which are interconnected, and the diameter of the low-pressure chamber is larger than the diameter of the high-pressure chamber; One end of the piston can extend from the low-pressure chamber into the high-pressure chamber, and the pressure building or pressure relief of the brake cylinder can be achieved through the movement of the piston inside the brake cylinder.
9. A braking system according to claim 8, characterized in that: A sealing member is provided on the circumferential inner wall of the high-pressure chamber and / or the low-pressure chamber; When the piston passes through the sealing member, the sealing member is deformed under pressure to isolate the high-pressure chamber from the low-pressure chamber.
10. A braking system according to claim 9, characterized in that: The sealing member is a leather cup, and the leather cup is fixedly mounted on the circumferential inner wall of the high-pressure chamber and / or the low-pressure chamber by at least one of bolt fixing, adhesive fixing and clamping fixing.