Brake cushion valve and hydraulic brake system thereof

Abstract

The utility model discloses a brake cushion valve and a hydraulic brake system thereof, and belongs to the field of heavy-load equipment braking, the brake cushion valve comprises a valve body, the valve body comprises an oil inlet part and a buffer part, the oil inlet part is connected with a brake pipeline of the brake system, the buffer part is connected with a brake oil tank, and the oil inlet part is connected with the buffer part. A compression part is arranged between the buffering part and the oil inlet part in a sliding mode, brake fluid entering from the oil inlet part pushes the compression part to slide towards the side away from the oil inlet part and compress the brake fluid, and the pressure of the brake fluid from a brake system is buffered. By arranging the slidable compression part, the compression part is pushed to slide and compress by using brake hydraulic pressure to form a dynamic pressure buffering mechanism, hydraulic impact in a brake system can be effectively absorbed by using a simple structure, and damage to pipelines or parts caused by sudden pressure rise is avoided; and the effects of slow braking in the first half process and complete braking in the second half process can be achieved, braking response sensitivity is kept, and system reliability is improved.

Description

Technical Field

[0001] This utility model belongs to the field of heavy-duty equipment braking, specifically, it relates to a brake buffer valve and its hydraulic braking system. Background Technology

[0002] In the braking systems of heavy-duty machinery, ensuring operational safety and stability is paramount. Braking system design typically relies directly on brake fluid pressure to transmit braking force, which is sufficient for light loads or standard operating conditions. However, when dealing with heavy-duty machinery, especially during emergency braking or prolonged continuous braking, the shortcomings of traditional designs become increasingly apparent.

[0003] Specifically, when heavy-duty machinery needs to decelerate rapidly or stop urgently, the braking system is subjected to enormous pressure. This instantaneous high pressure can damage the braking system, shorten its service life, and may even cause brake failure due to the instantaneous high pressure of the brake fluid, posing a safety hazard. Furthermore, due to the lack of an effective buffering mechanism, the impact force generated during braking can also damage the mechanical structure, increasing maintenance costs and downtime.

[0004] In actual braking processes, problems often arise such as excessive braking force or poor brake fine-tuning after applying the brakes, resulting in a very poor user experience. This is often addressed by increasing the damping of the brake pedal to increase friction in the initial travel of the pedal, thereby improving the coordination between the operator's expected braking action and the actual braking effect. Existing buffer brake valves are often unsuitable for braking systems in heavy-duty machinery. For example, Chinese patent CN108105192B discloses a buffer brake valve comprising: a valve body with a return oil port; a valve sleeve with a pressure oil port and a drain oil port; a main valve core; a bushing with a first spring supporting it and forming a pilot chamber between the bushing and the main valve core, the main valve core having a first damping orifice; a buffer piston with a return oil chamber above the bushing, a third damping orifice on it, a first flow passage in the bushing, a first spring seat with a second damping orifice fixed thereto; a second spring seat, a third spring seat, a second steel ball, a second spring, and a third spring located within the buffer piston, the lower end of the second spring seat being fixed to the first steel ball; a buffer cavity formed between the adjusting sleeve and the buffer piston, the upper part of the buffer piston having a fourth damping orifice. Its structure is complex and its control chain cumbersome, failing to meet the braking requirements of heavy-duty machinery.

[0005] In view of the above, this application is hereby submitted. Utility Model Content

[0006] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a brake buffer valve and its hydraulic braking system. This utility model is achieved through the following technical solution:

[0007] A brake buffer valve includes a valve body comprising an oil inlet and a buffer section. The oil inlet is connected to the brake line of the braking system, and the buffer section is connected to the brake fluid tank. A compression section is slidably disposed between the buffer section and the oil inlet. The brake fluid entering the oil inlet pushes the compression section to slide and compress away from the oil inlet, thereby buffering the brake fluid pressure from the braking system.

[0008] Preferably, the device further includes a valve sleeve, which is a hollow cylinder. One end of the hollow cylinder is equipped with an oil inlet, and the other end is equipped with a buffer. The two ends of the valve sleeve are respectively in contact with the oil inlet and the buffer through sealing gaskets.

[0009] Preferably, the hollow cylinder is provided with an oil inlet mounting cavity, a compression sliding cavity, and a buffer mounting cavity, which are connected in sequence, and the inner diameter of the compression sliding cavity is smaller than the inner diameter of the oil inlet mounting cavity and the buffer mounting cavity.

[0010] The oil inlet and the buffer are respectively installed in the oil inlet mounting cavity and the buffer mounting cavity;

[0011] The compression section is disposed within the sliding cavity of the compression section.

[0012] Preferably, the oil inlet includes an oil inlet connector with an axially through oil inlet channel. One end of the oil inlet channel is connected to the brake line of the braking system, and the other end is connected to the oil inlet mounting cavity. A stepped surface is formed between the compression sliding cavity and the oil inlet mounting cavity. A fluid-filled buffer cavity is formed between the end face of the oil inlet connector installed in the oil inlet mounting cavity and the stepped surface.

[0013] Preferably, the compression section includes a valve core and a compression spring slidably disposed in the sliding cavity of the compression section, the valve core being connected to the buffer section via the compression spring, and a spring cavity being formed between the valve core and the buffer section.

[0014] Preferably, a sealing mounting groove is formed on the outer wall surrounding the valve core, and a sealing ring is provided in the sealing mounting groove. One side of the sealing ring abuts against the sealing mounting groove, and the other side abuts against the inner wall of the sliding cavity of the compression section.

[0015] Preferably, the buffer section includes a return oil connector, which has an axially through-hole return oil channel, and the return oil connector is connected to the buffer section mounting cavity and the brake oil tank.

[0016] Preferably, the oil return connector has a spring mounting groove at one end where it is installed in the buffer mounting cavity, and one end of the compression spring is installed on the valve core, while the other end is installed in the spring mounting groove.

[0017] This utility model also provides a hydraulic braking system, in which a brake buffer valve as described above is used.

[0018] Preferably, it includes a brake pump, one end of which is connected to a foot pedal and the other end is connected to a brake line, and the side of the brake pump is connected to a reservoir.

[0019] The brake line includes a first oil line and a second oil line, the first oil line leading to the brake caliper and the second oil line leading to the control module of the travel system;

[0020] A third oil circuit is connected to the first oil circuit, and the third oil circuit is connected to the brake buffer valve.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] 1. By setting a sliding compression section, the brake fluid pressure is used to push the compression section to slide and compress, forming a dynamic pressure buffer mechanism. With a simple structure, it can effectively absorb the hydraulic shock in the braking system, avoid damage to pipelines or components caused by sudden pressure rise, and achieve the effect of slow braking in the first half and full braking in the second half, while maintaining braking response sensitivity and improving system reliability.

[0023] 2. The hollow cylindrical structure of the valve sleeve integrates the oil inlet and the buffer section into one unit, simplifying the assembly process. The two ends are sealed with gaskets to ensure the sealing between the valve sleeve and the oil inlet and the buffer section, preventing brake fluid leakage. At the same time, it reduces the requirements for machining accuracy and reduces manufacturing costs.

[0024] 3. By setting up oil inlet mounting cavities, compression sliding cavities, and buffer mounting cavities with different inner diameters, a stepped cavity structure is formed. On the one hand, this limits the sliding range of the compression section and avoids excessive displacement. On the other hand, the stepped surfaces created by the diameter differences guide the flow direction of the brake fluid, enhance the pressure buffering effect, and extend the service life of the components. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the brake buffer valve structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the hydraulic braking system of this utility model;

[0027] Figure 3 This is a schematic diagram of a conventional hydraulic braking system.

[0028] In the diagram: 1. Brake buffer valve; 11. Oil inlet connector; 12. Sealing gasket; 13. Valve sleeve; 14. Sealing ring; 15. Valve core; 16. Compression spring; 17. Oil return connector; 18. Spring cavity; 19. Fluid filling buffer cavity; 2. Brake caliper; 3. Oil reservoir; 4. Brake pump; 5. Foot pedal; 6. Control module; 7. Brake line; 71. First oil line; 72. Second oil line; 73. Third oil line. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings.

[0030] like Figure 1 and Figure 2 As shown, this embodiment provides a brake buffer valve, including a valve body. The valve body includes an oil inlet and a buffer. The oil inlet is connected to the brake line 7 of the braking system, and the buffer is connected to the brake oil tank. A compression section is slidably provided between the buffer section and the oil inlet. The brake fluid entering the oil inlet pushes the compression section to slide and compress away from the oil inlet, thus buffering the brake fluid pressure from the braking system.

[0031] By setting up a sliding compression section, the brake fluid pressure is used to push the compression section to slide and compress, forming a dynamic pressure buffer mechanism. With a simple structure, it can effectively absorb the hydraulic shock in the braking system, avoid damage to pipelines or components caused by sudden pressure rise, and achieve the effect of slow braking in the first half and full braking in the second half, while maintaining braking response sensitivity and improving system reliability.

[0032] It also includes a valve sleeve 13, which is a hollow cylinder. One end of the hollow cylinder is equipped with an oil inlet and the other end is equipped with a buffer. The two ends of the valve sleeve 13 are respectively connected to the oil inlet and the buffer through a sealing gasket 12.

[0033] The hollow cylindrical structure of the valve sleeve 13 integrates the oil inlet and the buffer section, simplifying the assembly process. The two ends are abutted by the sealing gasket 12 to ensure the sealing between the valve sleeve 13 and the oil inlet and the buffer section, preventing brake fluid leakage. At the same time, it reduces the machining accuracy requirements and reduces manufacturing costs.

[0034] The hollow cylinder is provided with an oil inlet mounting cavity, a compression sliding cavity, and a buffer mounting cavity. The oil inlet mounting cavity, the compression sliding cavity, and the buffer mounting cavity are connected in sequence, and the inner diameter of the compression sliding cavity is smaller than the inner diameter of the oil inlet mounting cavity and the buffer mounting cavity.

[0035] The oil inlet and the buffer are respectively installed in the oil inlet mounting cavity and the buffer mounting cavity;

[0036] The compression section is disposed within the sliding cavity of the compression section.

[0037] By setting up oil inlet mounting cavities, compression sliding cavities, and buffer mounting cavities with different inner diameters, a stepped cavity structure is formed. On the one hand, this limits the sliding range of the compression section and avoids excessive displacement. On the other hand, the stepped surfaces created by the diameter differences guide the flow direction of the brake fluid, enhance the pressure buffering effect, and extend the service life of the components.

[0038] Furthermore, the oil inlet includes an oil inlet connector 11, on which an axially through oil inlet channel is provided. One end of the oil inlet channel is connected to the brake line 7 of the braking system, and the other end is connected to the oil inlet mounting cavity. A stepped surface is formed between the compression sliding cavity and the oil inlet mounting cavity. A fluid-filled buffer cavity 19 is formed between the end face of the oil inlet connector 11 installed in the oil inlet mounting cavity and the stepped surface.

[0039] The design of the fluid-filled buffer chamber 19 can accommodate overflow brake fluid when the brake fluid pressure suddenly increases. The change in chamber volume through the movement of the compression section absorbs pressure fluctuations and improves buffer stability.

[0040] Preferably, the compression section includes a valve core 15 and a compression spring 16 slidably disposed in the sliding cavity of the compression section. The valve core 15 is connected to the buffer section through the compression spring 16, and a spring cavity 18 is formed between the valve core 15 and the buffer section.

[0041] The combined structure of valve core 15 and compression spring 16 achieves dual buffering: the elastic deformation of compression spring 16 provides gradual pressure release, while the sliding of valve core 15 accommodates more flow by changing the volume of the fluid channel. The two work together to achieve smooth step-like pressure decay, achieving braking buffering while avoiding mechanical vibration and noise.

[0042] Preferably, a sealing mounting groove is formed on the outer wall surrounding the valve core 15, and a sealing ring 14 is provided in the sealing mounting groove. One side of the sealing ring 14 abuts against the sealing mounting groove, and the other side abuts against the inner wall of the sliding cavity of the compression section.

[0043] The design of the sealing ring 14 and the sealing mounting groove effectively isolates the liquid leakage between the sliding cavity of the compression section and the external cavity, ensuring that the brake fluid pressure is fully applied to the compression section, avoiding buffer failure caused by internal leakage, and reducing the sliding resistance of the valve core 15 to improve the sensitivity of the action.

[0044] Furthermore, the buffer section includes a return oil connector 17, which has an axially through-type return oil channel. The return oil connector 17 is connected to the buffer section mounting cavity and the brake fluid tank. The axially through-type return oil channel directly connects the buffer section mounting cavity and the brake fluid tank, forming a low-resistance return oil path. This ensures that overflowing brake fluid quickly returns to the tank during the buffering process, preventing air lock or fluid stagnation and maintaining system pressure balance.

[0045] The oil return connector 17 is installed in the buffer section mounting cavity at one end, and a spring mounting groove is opened at the other end. One end of the compression spring 16 is installed on the valve core 15, and the other end is installed in the spring mounting groove.

[0046] This embodiment also provides a hydraulic braking system, in which a brake buffer valve 1 as described above is used.

[0047] Preferably, it includes a brake pump 4, one end of which is connected to a foot pedal 5 and the other end is connected to a brake line 7, and the side of the brake pump 4 is connected to an oil reservoir 3.

[0048] The brake line 7 includes a first oil line 71 and a second oil line 72. The first oil line 71 leads to the brake caliper 2, and the second oil line 72 leads to the control module 6 of the walking system.

[0049] A third oil circuit 73 is connected to the first oil circuit 71, and the third oil circuit 73 is connected to the brake buffer valve 1. The third oil circuit 73 connects the first oil circuit 71 and the brake buffer valve 1, and can bypass and relieve pressure when the main brake oil circuit pressure is abnormal, so as to avoid the brake caliper 2 from being directly subjected to excessive pressure and causing rapid lock-up. At the same time, it ensures that the hydraulic signal of the walking system control module 6 is not interfered with, thus taking into account both braking safety and handling stability.

[0050] When the foot pedal 5 is depressed, the brake pump 4 delivers high-pressure brake fluid to the brake line 7, which then reaches the control module 6 of the travel system via the second oil line 72. When the brake fluid reaches the control module 6, the control module 6 cuts off the driving force of the travel system, causing it to lose power. The fluid then flows to the brake caliper 2 via the first oil line 71, causing the caliper 2 to clamp the brake disc, thus achieving service braking. However, in actual operation, it often happens that after the foot pedal 5 is depressed, the brake caliper 2 quickly clamps the brake disc, resulting in excessively forceful braking and a poor braking experience. Therefore, compared with conventional hydraulic braking systems (such as...),... Figure 3 Unlike the previous embodiment, in this embodiment, the brake fluid is introduced into the brake buffer valve 1 through the third oil passage 73.

[0051] Brake fluid enters the filling buffer chamber 19 through the inlet connector 11, pushing the valve core 15 to compress the spring 16 and slide towards the buffer section.

[0052] During the sliding process of valve core 15, the volume of spring cavity 18 increases, absorbing overflow brake fluid, reducing the rate of pressure rise in the main oil circuit, and delaying the time when brake caliper 2 fully clamps the brake disc.

[0053] When the valve core 15 slides to the buffer distance L return to zero (the spring is fully compressed), as the foot pedal 5 is pressed down further, the brake fluid in the brake line 7 has no other way out, the third oil line 73 is closed, and the pressure of the main oil line is all applied to the brake caliper 2, so that the brake disc is fully clamped.

[0054] After releasing the foot pedal 5, the spring resets and pushes the valve core 15 back, and the brake fluid in the buffer chamber quickly flows back to the oil tank through the return oil channel, and the system pressure returns to the initial state.

[0055] Furthermore, the distance between the return oil connector 17 and the valve sleeve 13 can be adjusted. They can be connected by a sealing thread or other means. By adjusting the distance between the return oil connector 17 and the valve sleeve 13, the length of the buffer distance L and the elastic force of the compression spring 16 can be changed (the compression spring 16 can also be directly replaced to change its stiffness). After adjusting according to the braking effect, it can meet the operator's needs for slow braking in the first half and full braking in the second half when stepping on the foot pedal 5.

Claims

1. A brake cushion valve characterized by: The valve body includes an oil inlet and a buffer. The oil inlet is connected to the brake line (7) of the braking system, and the buffer is connected to the brake oil tank. A compression section is slidably provided between the buffer section and the oil inlet. The brake fluid entering the oil inlet pushes the compression section to slide and compress away from the oil inlet, thus buffering the brake fluid pressure from the braking system.

2. A brake cushion valve according to claim 1, characterised in that: It also includes a valve sleeve (13), which is a hollow cylinder. One end of the hollow cylinder is equipped with an oil inlet and the other end is equipped with a buffer. The two ends of the valve sleeve (13) are respectively connected to the oil inlet and the buffer through a sealing gasket (12).

3. A brake cushion valve according to claim 2, characterised in that: The hollow cylinder is provided with an oil inlet mounting cavity, a compression sliding cavity, and a buffer mounting cavity. The oil inlet mounting cavity, the compression sliding cavity, and the buffer mounting cavity are connected in sequence, and the inner diameter of the compression sliding cavity is smaller than the inner diameter of the oil inlet mounting cavity and the buffer mounting cavity. The oil inlet and the buffer are respectively installed in the oil inlet mounting cavity and the buffer mounting cavity; The compression section is disposed within the sliding cavity of the compression section.

4. A brake cushion valve according to claim 3, characterised in that: The oil inlet includes an oil inlet connector (11), which has an axially through oil inlet channel. One end of the oil inlet channel is connected to the brake line (7) of the braking system, and the other end is connected to the oil inlet mounting cavity. A stepped surface is formed between the compression sliding cavity and the oil inlet mounting cavity. A fluid-filled buffer cavity (19) is formed between the end face of the oil inlet connector (11) installed in the oil inlet mounting cavity and the stepped surface.

5. A brake and buffer valve according to claim 3 or 4, characterised in that: The compression section includes a valve core (15) and a compression spring (16) slidably disposed in the sliding cavity of the compression section. The valve core (15) is connected to the buffer section through the compression spring (16), and a spring cavity (18) is formed between the valve core (15) and the buffer section.

6. A brake cushion valve according to claim 5, characterised in that: A sealing mounting groove is provided on the outer wall surrounding the valve core (15), and a sealing ring (14) is provided in the sealing mounting groove. One side of the sealing ring (14) abuts against the sealing mounting groove, and the other side abuts against the inner wall of the sliding cavity of the compression section.

7. A brake cushion valve according to claim 5, characterised in that: The buffer section includes an oil return connector (17), which has an axially through-hole oil return channel and is connected to the buffer section mounting cavity and the brake oil tank.

8. A brake cushion valve according to claim 7, characterised in that: The return oil connector (17) is installed in the buffer section mounting cavity at one end with a spring mounting groove. One end of the compression spring (16) is installed on the valve core (15), and the other end is installed in the spring mounting groove.

9. A hydraulic brake system characterized by: The hydraulic braking system uses a brake buffer valve (1) as described in any one of claims 1-8.

10. A hydraulic brake system according to claim 9, characterised in that: Includes a brake pump (4), one end of which is connected to a foot pedal (5) and the other end is connected to a brake line (7), and the side of the brake pump (4) is connected to an oil reservoir (3); The brake line (7) includes a first oil line (71) and a second oil line (72). The first oil line (71) leads to the brake caliper (2), and the second oil line (72) leads to the control module (6) of the walking system. A third oil circuit (73) is connected to the first oil circuit (71), and the third oil circuit (73) is connected to the brake buffer valve (1).

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