Integrated commercial vehicle brake structure

Abstract

The invention belongs to the technical field of braking systems, and provides an integrated commercial vehicle braking structure which comprises a cavity, a return spring, a valve, a valve seat, a pressure limiting piston, a pressure limiting spring and a spring seat. Wherein the return spring is arranged at the bottom in the cavity; the valve is arranged at the top end of the return spring; the valve seat is arranged on the inner side wall of the cavity; the bottom end of the pressure limiting piston penetrates through the valve seat to abut against the valve, and a vent hole is formed in the pressure limiting piston and extends to the top end from the bottom end of the pressure limiting piston. The spring seat is provided with an exhaust port; and the pressure limiting spring is arranged between the spring seat and the pressure limiting piston. According to the brake structure, on the basis that existing parts are shared, the pressure limiting valve structure is integrated into the rear axle brake module, so that the brake structure is suitable for the situation that the electromagnetic valve cannot meet the pressure-resistant requirement due to the fact that the working air pressure of a whole vehicle rises. The method is suitable for application and development of various vehicle types, and the whole vehicle layout is not changed and additional pressure limiting products are not added.

Description

Technical Field

[0001] This invention belongs to the field of braking system technology, specifically relating to an integrated braking structure for commercial vehicles. Background Technology

[0002] The integrated rear axle braking module used in the air braking system of commercial vehicles integrates the functions of one relay valve and two ABS pressure regulating valves. It eliminates the original piping and connectors between the relay valve and the ABS pressure regulating valve, and combines the original three mounting brackets into one, greatly simplifying the customer's vehicle layout and parts installation process.

[0003] However, in actual operation, the working pressure of the air tank has increased to 12.5 bar-13 bar as the overall vehicle pressure increases, and the existing solenoid valve structure cannot meet the pressure resistance requirements.

[0004] A common solution is to use a high-pressure resistant solenoid valve structure; however, high-pressure resistant solenoid valve structures take up a lot of space and have a long development cycle. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the present invention provides an integrated commercial vehicle braking structure that can solve the above problems.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an integrated commercial vehicle braking structure, comprising a cavity, a return spring, a valve, a valve seat, a pressure limiting piston, a pressure limiting spring, and a spring seat; The bottom of the cavity is connected to the air inlet, and the top of the cavity is open; The return spring is located at the bottom of the cavity; The valve is located at the top of the return spring; The valve seat is disposed on the inner side wall of the cavity, the valve seat is located above the valve, and the valve seat is adapted to the valve; The pressure limiting piston has a sliding ring on its side wall, which slides in conjunction with the inner side wall of the cavity. The sliding ring and the inner side wall of the cavity are sealed. The bottom end of the pressure limiting piston passes through the valve seat and abuts against the valve. The pressure limiting piston has a vent hole that extends from the bottom end to the top end of the pressure limiting piston. The spring seat covers the opening at the top of the cavity, and the spring seat is provided with an exhaust port; The pressure-limiting spring is disposed between the spring seat and the pressure-limiting piston; The cavity is connected to the solenoid valve.

[0007] Preferably, the valve has a rubber pad at the top, and the bottom end of the pressure-limiting piston passes through the valve seat and abuts against the rubber pad.

[0008] Preferably, an annular groove is formed on the outer wall of the sliding ring, and a sealing ring is provided in the annular groove.

[0009] Preferably, the sealing ring has a barbed cross-section.

[0010] Preferably, a limiting ring is provided on the inner side wall of the cavity.

[0011] Preferably, the spring seat is screwed to the opening at the top of the cavity.

[0012] Preferably, a guide rod is provided at the bottom of the cavity, and a guide cylinder is provided at the bottom of the valve, with the guide cylinder slidably sleeved on the outside of the guide rod.

[0013] Preferably, the pressure-limiting piston has a guide on its sidewall, and the guide slides in conjunction with the inner sidewall of the cavity.

[0014] Preferably, the guide member is fixed to the pressure-limiting piston by bolts.

[0015] Preferably, the guide is sleeved on the outside of the pressure limiting piston, the side wall of the pressure limiting piston is provided with a strip groove, the inner wall of the strip groove is provided with a screw hole, the inner side wall of the guide is provided with a connecting block, the connecting block is provided with a connecting hole, and the bolt passes through the connecting hole and is screwed into the screw hole.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention provides an integrated commercial vehicle braking structure in which gas from the air inlet enters the upper part of the cavity through an open valve. When the pressure at the air inlet reaches the pressure limit set value (e.g., 10 bar), the pressure acting on the pressure limiting piston is greater than the output force of the pressure limiting spring. The piston moves upward, closes the air inlet valve (valve seat), and opens the exhaust valve (bottom of the vent hole). The excess gas is discharged through the exhaust valve and the exhaust port on the spring seat, and reaches equilibrium at the limited pressure value (10 bar). Thus, the air pressure in the upper part of the cavity can be controlled within a limited range, thereby achieving the pressure limiting function.

[0017] 2. This invention provides an integrated commercial vehicle braking structure that integrates a pressure-limiting valve structure into the rear axle braking module while sharing existing components. This is suitable for situations where the solenoid valve cannot meet the pressure resistance requirements due to increased overall vehicle operating air pressure. It is applicable to various vehicle models without altering the overall vehicle layout or requiring additional pressure-limiting products. Attached Figure Description

[0018] Figure 1 This is one of the cross-sectional structural schematic diagrams of an integrated commercial vehicle braking structure provided in an embodiment of the present invention; Figure 2 A second cross-sectional schematic diagram of an integrated commercial vehicle braking structure provided in an embodiment of the present invention; Figure 3 A three-dimensional structural diagram of an integrated commercial vehicle braking structure provided in an embodiment of the present invention; Figure 4 A three-dimensional structural diagram of a valve seat and related parts of an integrated commercial vehicle braking structure provided in an embodiment of the present invention; Figure 5 A three-dimensional structural diagram of a sliding ring and related parts of an integrated commercial vehicle braking structure provided in an embodiment of the present invention; Figure 6 A three-dimensional structural diagram of a rubber pad and related parts of an integrated commercial vehicle braking structure provided in an embodiment of the present invention; Figure 7 A three-dimensional structural diagram of a pressure-limiting piston and related parts of an integrated commercial vehicle braking structure provided in an embodiment of the present invention; Figure 8 A three-dimensional structural diagram of a guide component and related parts of an integrated commercial vehicle braking structure provided in an embodiment of the present invention; Figure 9 A three-dimensional structural diagram of a strip groove and related parts of an integrated commercial vehicle braking structure provided in an embodiment of the present invention; Figure 10 This is a three-dimensional structural diagram of the lower half of the piston in an integrated commercial vehicle braking structure provided in an embodiment of the present invention.

[0019] The attached diagram lists the components represented by each number as follows: 1. Spring seat; 2. Pressure limiting spring; 3. Pressure-limiting piston; 301. Upper section of piston; 302. Lower section of piston; 4. Valve seat; 5. Valves; 6. Return spring; 7. Cavity; 8. Air intake; 9. Sliding ring; 10. Exhaust port; 11. Solenoid valve; 12. Rubber pad; 13. Sealing ring; 14. Limiting ring; 15. Guide components; 16. Guide rod; 17. Guide cylinder; 18. Groove; 19. Connecting block; 20. Vent hole. Detailed Implementation

[0020] To make the technical solutions and advantages of the embodiments of this application clearer, the exemplary embodiments of this application will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not an exhaustive list of all embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0021] Example 1 This embodiment provides an integrated commercial vehicle braking structure, including a cavity 7, a return spring 6, a valve 5, a valve seat 4, a pressure limiting piston 3, a pressure limiting spring 2, and a spring seat 1.

[0022] The bottom of cavity 7 is connected to air inlet 8, and the top of cavity 7 is open; For example, see Figure 1 The cavity 7 is set vertically, and the bottom end of the cavity 7 is connected to the air inlet 8, so that the gas provided by the air inlet 8 can directly enter the cavity 7.

[0023] The return spring 6 is located at the bottom of the cavity 7; For example, see Figure 1 The return spring 6 is vertically installed inside the cavity 7. The bottom end of the return spring 6 is fixedly connected to the bottom surface of the cavity 7. The return spring 6 can extend and retract vertically.

[0024] Valve 5 is located at the top of return spring 6; For example, see Figure 1 The bottom of valve 5 is provided with a lower protrusion that is adapted to return spring 6. The top of return spring 6 is sleeved on the outside of the lower protrusion. Valve 5 can move up and down. Return spring 6 is in a compressed state, that is, return spring 6 plays a supporting role.

[0025] Valve seat 4 is disposed on the inner wall of cavity 7, and valve seat 4 is located above valve 5. Valve seat 4 is adapted to valve 5. For example, see Figure 1 , Figure 4 The valve seat 4 is fixedly mounted on the inner wall of the cavity 7. The valve seat 4 serves as a separator, dividing the cavity 7 into upper and lower parts. Simultaneously, the valve seat 4 has a channel in the middle, connecting the upper and lower parts of the cavity 7. The valve 5 can move upwards to abut against the valve seat 4. At this point, the valve 5 completely seals the channel of the valve seat 4, thus isolating the upper and lower parts of the cavity 7. In this state, gas from the lower part of the cavity 7 cannot enter the upper part of the cavity 7.

[0026] The pressure limiting piston 3 has a sliding ring 9 on its side wall. The sliding ring 9 slides with the inner side wall of the cavity 7. The sliding ring 9 and the inner side wall of the cavity 7 are sealed. The bottom end of the pressure limiting piston 3 passes through the valve seat 4 and abuts against the valve 5. The pressure limiting piston 3 has a vent hole 20 inside. The vent hole 20 extends from the bottom end of the pressure limiting piston 3 to the top end. For example, see Figure 1 The pressure-limiting piston 3 is disposed inside the cavity 7, and a sliding ring 9 is fixedly sleeved on the outside of the pressure-limiting piston 3. The sliding ring 9 can slide up and down inside the cavity 7, and the sliding ring 9 seals against the inner wall of the cavity 7. That is, the pressure-limiting piston 3 and the sliding ring 9 can play a sealing role, preventing the gas in the upper part of the cavity 7 from flowing upward. The pressure-limiting piston 3 is coaxially provided with a vent hole 20, and the bottom end of the pressure-limiting piston 3 passes downward through the channel of the valve seat 4 and abuts against the valve 5. When abutting, the bottom end of the vent hole 20 is closed by the valve 5.

[0027] Spring seat 1 is placed over the opening at the top of cavity 7, and spring seat 1 is provided with vent 10; For example, see Figure 1 The spring seat 1 is connected to the top opening of the cavity 7 by a thread. The spring seat 1 is provided with an exhaust port 10, and the gas at the top of the cavity 7 can be discharged through the exhaust port 10.

[0028] The pressure-limiting spring 2 is disposed between the spring seat 1 and the pressure-limiting piston 3; For example, see Figure 1 The pressure-limiting spring 2 is vertically positioned inside the cavity 7. The bottom end of the spring seat 1 has a mounting sleeve adapted to the pressure-limiting spring 2. The top end of the pressure-limiting spring 2 is fitted inside the mounting sleeve of the spring seat 1, and the bottom end is fitted outside the top end of the pressure-limiting piston 3. The pressure-limiting spring 2 can extend and retract vertically. When in a compressed state, the pressure-limiting spring 2 exerts downward pressure on the pressure-limiting piston 3. Furthermore, the elastic force of the pressure-limiting spring 2 is greater than that of the return spring 6.

[0029] The cavity 7 is connected to the solenoid valve 11, and the connection point is located between the valve seat 4 and the sliding ring 9.

[0030] For example, see Figure 1 The left inlet of the solenoid valve 11 is connected to the side wall of the cavity 7, and the connection point is located between the valve seat 4 and the sliding ring 9, so that the gas in the upper part of the cavity 7 can directly enter the solenoid valve 11.

[0031] Based on the above, when the braking structure provided in this embodiment is in use, the gas from the air inlet 8 first enters the lower part of the cavity 7, and then enters the upper part of the cavity 7 through the channel of the open valve seat 4. As the air pressure in the cavity 7 increases, the pressure exerted by the air pressure on the pressure limiting piston 3 is greater than the force of the pressure limiting spring 2, so the pressure limiting piston 3 moves upward, and at the same time the valve 5 moves upward.

[0032] When the pressure at the air inlet 8 is less than the pressure limit set value, the pressure limiting piston 3 moves upward a certain distance and then stops moving upward, while the valve seat 4 remains open, and the air inlet 8 supplies air stably.

[0033] When the pressure at the air inlet 8 equals the pressure limit set, the pressure limiting piston 3 moves upward, and at the same time, the valve 5 moves upward to abut against the valve seat 4, closing the valve seat 4. The bottom end of the pressure limiting piston 3 remains in contact with the valve 5, and the air pressure in the upper part of the cavity 7 is stable.

[0034] When the pressure at the air inlet 8 exceeds the pressure limit set value, the pressure limiting piston 3 will move up to the bottom and disengage from the valve 5. At this time, the valve seat 4 remains closed, and the gas in the upper part of the cavity 7 can enter through the bottom of the vent hole 20 and be discharged through the exhaust port 10 on the spring seat 1, causing the air pressure in the upper part of the cavity 7 to decrease. After the air pressure in the upper part of the cavity 7 decreases, the pressure limiting piston 3 moves down until the bottom of the pressure limiting piston 3 abuts against the valve 5, sealing the bottom inlet of the vent hole 20 and making the air pressure in the upper part of the cavity 7 reach equilibrium. This allows the air pressure in the upper part of the cavity 7 to be controlled within a limited range, thus achieving the pressure limiting function.

[0035] If too much gas is consumed in the upper part of cavity 7, causing a significant drop in air pressure, the pressure-limiting piston 3 will push valve 5 downward, opening valve seat 4 and allowing air inlet 8 to replenish gas to cavity 7, causing the air pressure in the upper part of cavity 7 to rise again. This allows the air pressure in the upper part of cavity 7 to be controlled within a limited range, achieving the pressure-limiting function.

[0036] Based on shared existing parts, the pressure-limiting valve structure is integrated into the rear axle braking module to address situations where the solenoid valve cannot meet the pressure resistance requirements due to increased vehicle operating air pressure. This is applicable to various vehicle models without altering the overall vehicle layout or requiring additional pressure-limiting products.

[0037] Based on the above technical solution, in the technical solution provided in this embodiment, the top of the valve 5 is provided with a rubber pad 12, and the bottom of the pressure limiting piston 3 passes through the valve seat 4 and abuts against the rubber pad 12. For example, see Figure 2 , Figure 5 , Figure 6 The valve 5 has a mounting groove at its top that fits the rubber gasket 12, and the rubber gasket 12 is placed inside the mounting groove. When the bottom end of the pressure-limiting piston 3 abuts against the rubber gasket 12, the sealing effect is better. Secondly, the bottom end of the valve seat 4 has an annular plate, which is sleeved on the outside of the channel. When the valve 5 moves upward to abut against the valve seat 4, the annular plate abuts against the rubber gasket 12, which can improve the sealing performance between the valve seat 4 and the valve 5.

[0038] In the technical solution provided in this embodiment, an annular groove is provided on the outer wall of the sliding ring 9, and a sealing ring 13 is provided in the annular groove; The cross-section of the sealing ring 13 has a barbed structure; For example, see Figure 2 , Figure 5 An annular groove is coaxially provided on the outer wall of the sliding ring 9, and a sealing ring 13 is coaxially sleeved in the annular groove. During the up and down movement of the pressure limiting piston 3, the outer end of the sealing ring 13 always keeps in contact with the inner wall of the cavity 7, which can improve the sealing performance between the sliding ring 9 and the inner wall of the cavity 7.

[0039] In the technical solution provided in this embodiment, a limiting ring 14 is provided on the inner wall of the cavity 7, and the limiting ring 14 is located below the sliding ring 9; For example, see Figure 2 A limiting ring 14 is coaxially fixed on the inner wall of the cavity 7. The pressure-limiting piston 3 passes through the limiting ring 14, and the sliding ring 9 is located above the limiting ring 14. This prevents the sliding ring 9 from descending too far, thereby preventing the pressure-limiting piston 3 from descending too far. It is worth noting that when the sliding ring 9 abuts against the limiting ring 14, the bottom end of the pressure-limiting piston 3 has already descended to below the valve seat 4 channel.

[0040] In the technical solution provided in this embodiment, a guide rod 16 is provided at the bottom of the cavity 7, and a guide cylinder 17 is provided at the bottom of the valve 5. The guide cylinder 17 is slidably sleeved on the outside of the guide rod 16. For example, see Figure 2 The guide rod 16 is arranged vertically, with its bottom end fixed to the bottom surface of the cavity 7. The guide cylinder 17 is slidably sleeved on the outside of the guide rod 16, and its top end is fixedly connected to the valve 5. The return spring 6 is sleeved on the outside of the guide cylinder 17, without affecting each other. In this way, when the valve 5 moves up and down, it can drive the guide cylinder 17 to move up and down. Due to the guiding effect of the guide rod 16, the valve 5 can move up and down stably, preventing the return spring 6 from shaking or deviating. This can improve the sealing performance when the valve 5 abuts against the pressure-limiting piston 3 and when the valve 5 abuts against the valve seat 4.

[0041] In the technical solution provided in this embodiment, a guide 15 is provided on the side wall of the pressure limiting piston 3, and the guide 15 slides in cooperation with the inner side wall of the cavity 7. For example, see Figure 2 The guide member 15 has a ring structure and is fixedly sleeved on the outside of the pressure-limiting piston 3. During the up-and-down movement of the pressure-limiting piston 3, the guide member 15 always slides against the inner wall of the cavity 7, thereby improving the stability of the pressure-limiting piston 3 during its up-and-down movement and preventing the bottom end of the pressure-limiting piston 3 from shifting. The cross-section of the guide member 15 can be an isosceles trapezoid, bowl-shaped, semi-circular, etc. The guide member 15 has air guide holes running through its upper and lower parts to ensure that the upper and lower sides of the guide member 15 are in a connected state.

[0042] Furthermore, the guide 15 is fixed to the pressure-limiting piston 3 by bolts; The guide 15 is sleeved on the outside of the pressure limiting piston 3. The side wall of the pressure limiting piston 3 is provided with a strip groove 18. The inner wall of the strip groove 18 is provided with a screw hole. The inner side wall of the guide 15 is provided with a connecting block 19. The connecting block 19 is provided with a connecting hole. The bolt passes through the connecting hole and is screwed into the screw hole. For example, see Figure 3 Cavity 7 consists of a lower shell and an upper shell, which are connected by bolts. See also Figure 4 Valve seat 4 is located inside the lower housing. See also Figure 7 The connection points between the spring seat 1 and the solenoid valve 11 and the cavity 7 are all located in the upper housing, and the guide 15 is also located inside the upper housing.

[0043] See Figure 8 The bottom end of the strip groove 18 (shown in a bottom view) extends to the bottom end of the pressure-limiting piston 3, and the connecting block 19 is adapted to the strip groove 18. During installation, the guide 15 is slipped onto the bottom end of the pressure-limiting piston 3, allowing the connecting block 19 to enter the strip groove 18. Due to the limiting effect of the connecting block 19, the guide 15 cannot rotate after being slipped on, but the connecting block 19 can move up and down within the strip groove 18 until it abuts against the top end of the strip groove 18. At this point, the connecting block 19 cannot move further upwards, and the guide 15 also cannot move further upwards. Simultaneously, the connecting hole of the connecting block 19 aligns with the screw hole of the strip groove 18. By threading a bolt through the connecting hole and screwing it into the screw hole, the connecting block 19 and the strip groove 18 can be locked and fixed, thereby locking and fixing the guide 15 and the pressure-limiting piston 3. See again. Figure 7 Because the upper housing has an opening at the bottom and the slot 18 faces downwards, when disassembling the guide 15, the operator can simply reach into the upper housing with a screwdriver and into the slot 18 to loosen the bolts. This operation is simple and convenient, avoiding the problems caused by the guide 15 and the limiting ring 14. (See [reference needed]). Figure 2 This caused the pressure-limiting piston 3 to be unable to be smoothly removed from the cavity 7.

[0044] Furthermore, the pressure-limiting piston 3 can include an upper piston section 301 and a lower piston section 302, with the upper piston section 301 and the lower piston section 302 screwed together, and a sealing ring clamped between the upper piston section 301 and the lower piston section 302. For example, see Figure 9 A threaded hole is located at the bottom end of the upper half of the piston 301 (shown in a bottom view), and a strip groove 18 is located in the lower half of the piston 302, extending through the lower half of the piston 302. The bottom end of the upper half of the piston 301 has an internally threaded connecting sleeve, and the top end of the lower half of the piston 302 has an externally threaded connection. The top end of the lower half of the piston 302 is threaded to the connecting sleeve at the bottom end of the upper half of the piston 301. By rotating the lower half of the piston 302, the strip groove 18 is aligned with the threaded hole, allowing the guide member 15 to be fitted. Finally, the connecting block 19 is connected to the threaded hole using bolts.

[0045] Because the upper half 301 and the lower half 302 of the piston are screwed together, the overall length of the pressure-limiting piston 3 can be finely adjusted by rotating the lower half 302. Simultaneously, a sealing ring is held between the upper half 301 and the lower half 302, ensuring a constant seal between them. When manufacturing errors result in an unsuitable length or poor precision for the pressure-limiting piston 3, its overall length can be adjusted by rotating the lower half 302, eliminating the need to remanufacture the pressure-limiting piston 3 and effectively improving its applicability and flexibility.

[0046] Secondly, the connecting block 19 can play a limiting role. After the guide 15 is installed, since the connecting block 19 is connected to the screw hole of the upper half section 301 of the piston by bolts, the lower half section 302 of the piston can be prevented from rotating, thereby improving the stability of the upper half section 301 and the lower half section 302 of the piston.

[0047] See Figure 10 The lower half of the piston 302 can be provided with two strip grooves 18, which are arranged opposite to each other. In this way, when it is necessary to adjust the length of the pressure limiting piston 3, the lower half of the piston 302 can be rotated 180° to align the other strip groove 18 with the screw hole of the upper half of the piston 301, and then subsequent installation can be carried out without having to rotate a multiple of 360°. This further improves the adjustment accuracy of the length of the pressure limiting piston 3 and greatly enhances its adaptability.

[0048] Of course, the lower half of the piston 302 can also be provided with multiple strip grooves 18. The more strip grooves 18 there are, the higher the adjustment accuracy.

[0049] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0051] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0052] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. An integrated braking structure for commercial vehicles, characterized in that, Includes cavity (7), return spring (6), valve (5), valve seat (4), pressure limiting piston (3), pressure limiting spring (2), and spring seat (1); The bottom end of the cavity (7) is connected to the air inlet (8), and the top end of the cavity (7) is open; The return spring (6) is disposed at the bottom of the cavity (7); The valve (5) is located at the top of the return spring (6); The valve seat (4) is disposed on the inner side wall of the cavity (7), the valve seat (4) is located above the valve (5), and the valve seat (4) is adapted to the valve (5); The pressure limiting piston (3) has a sliding ring (9) on its side wall. The sliding ring (9) slides in cooperation with the inner wall of the cavity (7). The sliding ring (9) and the inner wall of the cavity (7) are sealed. The bottom end of the pressure limiting piston (3) passes through the valve seat (4) and abuts against the valve (5). The pressure limiting piston (3) has a vent hole (20) inside. The vent hole (20) extends from the bottom end of the pressure limiting piston (3) to the top end. The spring seat (1) is placed over the opening at the top of the cavity (7), and the spring seat (1) is provided with an exhaust port (10). The pressure-limiting spring (2) is disposed between the spring seat (1) and the pressure-limiting piston (3); The cavity (7) is connected to the solenoid valve (11).

2. The integrated commercial vehicle braking structure according to claim 1, characterized in that, The valve (5) has a rubber pad (12) at the top, and the bottom end of the pressure limiting piston (3) passes through the valve seat (4) and abuts against the rubber pad (12).

3. The integrated commercial vehicle braking structure according to claim 1, characterized in that, An annular groove is provided on the outer wall of the sliding ring (9), and a sealing ring (13) is provided in the annular groove.

4. The integrated commercial vehicle braking structure according to claim 3, characterized in that, The cross-section of the sealing ring (13) is a barbed structure.

5. The integrated commercial vehicle braking structure according to claim 1, characterized in that, A limiting ring (14) is provided on the inner wall of the cavity (7).

6. The integrated commercial vehicle braking structure according to claim 1, characterized in that, The spring seat (1) is screwed to the top opening of the cavity (7).

7. The integrated commercial vehicle braking structure according to claim 1, characterized in that, The bottom of the cavity (7) is provided with a guide rod (16), and the bottom of the valve (5) is provided with a guide cylinder (17). The guide cylinder (17) is slidably sleeved on the outside of the guide rod (16).

8. The integrated commercial vehicle braking structure according to claim 1, characterized in that, The pressure-limiting piston (3) has a guide (15) on its side wall, and the guide (15) slides in cooperation with the inner side wall of the cavity (7).

9. An integrated commercial vehicle braking structure according to claim 8, characterized in that, The guide (15) is fixed to the pressure-limiting piston (3) by bolts.

10. An integrated commercial vehicle braking structure according to claim 9, characterized in that, The guide (15) is sleeved on the outside of the pressure limiting piston (3). The side wall of the pressure limiting piston (3) is provided with a strip groove (18). The inner wall of the strip groove (18) is provided with a screw hole. The inner side wall of the guide (15) is provided with a connecting block (19). The connecting block (19) is provided with a connecting hole. The bolt passes through the connecting hole and is screwed into the screw hole.

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