Hydraulic hand brake valve

Abstract

The utility model relates to a hydraulic hand brake valve which comprises the following components: a valve body which comprises an oil inlet, an oil return port and an oil outlet; the valve element is provided with an oil way groove, and the oil way groove is connected with the oil return opening and the oil inlet; the balance spring is used for adjusting movement of the valve element and keeping the pressure of the oil outlet; when the valve element descends, the oil inlet and the oil return opening are disconnected, and the pressure of the oil outlet is increased. And when the pressure of the oil outlet and the compression amount of the balance spring are in a balanced state, the parking braking force required by the target vehicle is achieved. According to the hydraulic hand brake valve, the oil inlet, the oil return port and the oil outlet are formed, the balance spring is introduced, the internal structure of the hydraulic hand brake valve is simplified, the number of parts is reduced, meanwhile, the overall dimension is effectively controlled, the production cost of the hydraulic hand brake valve is reduced, and the assembly efficiency of the hydraulic hand brake valve is improved. And meanwhile, the hydraulic hand brake valve can be more suitable for the spatial layout requirement of the light truck.

Description

Technical Field

[0001] This application relates to the field of vehicle braking technology, and in particular to a hydraulic handbrake valve. Background Technology

[0002] With the development of the automotive industry, the safety and performance requirements for different vehicle models are constantly increasing. Especially in the light truck sector, the efficiency of the parking brake system directly affects the safety and reliability of vehicle parking. Traditionally, light trucks mostly use mechanical cable-operated parking brake structures. This structure is simple and inexpensive, but its inherent limitations lead to lower parking efficiency, especially in heavy-duty light trucks, making it difficult to meet the stringent safety requirements of modern transportation. Heavy vehicles such as construction machinery and mining trucks have widely adopted hydraulic parking brake systems. These systems can provide greater braking force, have higher reliability and response speed, and are very suitable for occasions requiring strong parking efficiency.

[0003] Traditional hydraulic handbrake valves have problems such as complex internal structure, numerous parts, and large external dimensions. Complex structure is often accompanied by a higher failure rate, which affects the stability and reliability of the entire braking system. Utility Model Content

[0004] Therefore, it is necessary to provide a hydraulic handbrake valve with a simplified internal structure and a reduced number of parts to address the aforementioned technical problems.

[0005] This application provides a hydraulic handbrake valve, comprising:

[0006] The valve body includes an oil inlet, an oil return port, and an oil outlet;

[0007] The valve core has an oil passage groove, which is connected to the oil return port and the oil inlet port;

[0008] The balance spring is used to regulate the movement of the valve core and maintain the oil outlet pressure.

[0009] When the valve core descends, the oil inlet and outlet are disconnected, increasing the oil outlet pressure. When the oil outlet pressure and the compression of the balance spring are in equilibrium, the parking braking force required by the target vehicle is achieved.

[0010] In one embodiment, the hydraulic handbrake valve further includes:

[0011] The cam is used to drive the valve core to move linearly, so as to adjust the hydraulic oil circuit.

[0012] Locking sleeve, used to lock or unlock the valve core;

[0013] When the locking sleeve is in the first state, the cam drives the valve core to descend, which disconnects the oil inlet from the oil return port. The oil inlet and the oil outlet are connected through the oil passage groove, and the hydraulic oil flows into the oil outlet, thereby increasing the pressure at the oil outlet.

[0014] In one embodiment, the hydraulic handbrake valve further includes:

[0015] When the pressure at the oil outlet is greater than the expansion force of the balance spring, the balance spring drives the valve core to rise, causing the oil passage groove to disconnect from the oil inlet, so that the pressure at the oil outlet and the compression of the balance spring are in balance.

[0016] In one embodiment, the first end of the locking sleeve is a cylinder with an integrated stepped surface, the second end of the locking sleeve is a flange structure, and an annular groove is formed on the end face of the second end of the locking sleeve.

[0017] In one embodiment, the valve body is provided with a valve core cavity; the valve body is provided with an oil inlet, an oil return port, an oil outlet and a valve body flange, and the oil inlet, oil return port and oil outlet are interconnected through the valve core cavity.

[0018] In one embodiment, the valve core is disposed in the valve core cavity, and the valve core is also provided with blind holes, guide holes and sealing grooves; the valve core is used to adjust the connection state between the oil inlet, oil return port and oil outlet.

[0019] In one embodiment, the hydraulic handbrake valve further includes:

[0020] The sealing ring is installed in the sealing groove of the valve core to ensure a seal between the valve core and the valve body.

[0021] In one embodiment, a balance spring is located inside the valve body and contacts the valve core.

[0022] In one embodiment, the hydraulic handbrake valve further includes:

[0023] The support has a valve stem receiving hole. The support is used to support the valve stem and provide fixation and guidance for the valve stem.

[0024] In one embodiment, the hydraulic handbrake valve further includes:

[0025] The valve stem passes through the valve stem receiving hole and contacts the balance spring.

[0026] The aforementioned hydraulic handbrake valve includes: a valve body with an inlet, a return port, and an outlet; a valve core with an oil passage groove connected to the return port and the inlet; and a balance spring for adjusting the movement of the valve core and maintaining the outlet pressure. When the valve core descends, the inlet and return ports disconnect, increasing the outlet pressure. When the outlet pressure and the compression of the balance spring are balanced, the required parking braking force for the target vehicle is achieved. This hydraulic handbrake valve, by defining an inlet, return port, and outlet, and introducing a balance spring, simplifies the internal structure and reduces the number of parts, while effectively controlling the external dimensions, thus improving production costs and assembly efficiency. Furthermore, it makes the hydraulic handbrake valve more suitable for the spatial layout requirements of light trucks. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the internal structure of a hydraulic handbrake valve in one embodiment;

[0029] Figure 2 This is a schematic diagram of the external structure of a hydraulic handbrake valve in one embodiment;

[0030] Figure 3 This is a cross-sectional schematic diagram of the hydraulic handbrake valve in one embodiment;

[0031] Figure 4 for Figure 2 A schematic diagram of the external structure of a medium-pressure hydraulic handbrake valve from another perspective;

[0032] Figure 5 for Figure 2 A schematic diagram of the external structure of a hydraulic handbrake valve from another perspective;

[0033] Figure 6 for Figure 2 A schematic diagram of the external structure of a hydraulic handbrake valve from another perspective;

[0034] Figure 7 This is a schematic diagram of the hydraulic handbrake valve after removing the cover in one embodiment;

[0035] Figure 8 for Figure 7 A schematic diagram of the hydraulic handbrake valve after the cover has been removed, from another perspective;

[0036] Figure 9 This is a schematic diagram of the valve core structure in one embodiment;

[0037] Figure 10 for Figure 9 A schematic diagram of the valve core from another perspective;

[0038] Figure 11 for Figure 9 Another schematic diagram of the valve core from a different perspective;

[0039] Figure 12 for Figure 9 A cross-sectional schematic diagram of the valve core;

[0040] Figure 13 This is a schematic diagram of the support structure in one embodiment;

[0041] Figure 14 for Figure 13 A schematic diagram of the central support from another perspective;

[0042] Figure 15 for Figure 13 A schematic diagram of the central support from another perspective.

[0043] 10. Hydraulic handbrake valve; 11. Valve body; 12. Valve core; 13. Balance spring; 14. Cam; 15. Locking sleeve; 16. Sealing ring; 17. Support; 18. Valve stem; 19. Return spring; 20. Connector; 21. Roller; 22. Pin; 23. Tie rod; 24. Locking spring; 25. Retaining ring; 26. Hand lever; 27. Cover; 28. Torsion spring; 29. ​​Locking pin;

[0044] 111. Oil inlet; 112. Oil return port; 113. Oil outlet; 114. Valve body flange; 121. Oil passage groove; 122. Blind hole; 123. Guide hole; 124. Sealing groove; 171. Valve stem receiving hole; 172. Valve stem mounting hole; 173. Pin receiving hole; 271. First locking hole; 272. Second locking hole; 273. Locking groove. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0046] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0047] 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", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, 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.

[0048] 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 at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0049] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0050] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0051] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0052] See Figures 1 to 15 , Figure 1 This diagram shows the internal structure of the hydraulic handbrake valve 10 according to one embodiment of the present invention. Figure 2 , Figure 4 , Figure 5 and Figure 6 A schematic diagram of the external structure of the hydraulic handbrake valve 10 is shown. Figure 3 A cross-sectional schematic diagram of a hydraulic handbrake valve is shown. Figure 7 and Figure 8 A schematic diagram of the hydraulic handbrake valve 10 after removing the cover 27 is shown. Figure 9 , Figure 10 , Figure 11 and Figure 12 A schematic diagram of the valve core 12 structure is shown. Figure 13 , Figure 14 and Figure 15 A schematic diagram of the support 17 structure is shown. An embodiment of this utility model provides a hydraulic handbrake valve 10, comprising: a valve body 11, including an oil inlet 111, an oil return port 112, and an oil outlet 113; a valve core 12, having an oil passage groove 121 connected to the oil return port 112 and the oil inlet 111; and a balance spring 13 for adjusting the movement of the valve core 12 and maintaining the pressure at the oil outlet 113. When the valve core 12 descends, the oil inlet 111 disconnects from the oil return port 112, increasing the pressure at the oil outlet 113. When the pressure at the oil outlet 113 is balanced with the compression of the balance spring 13, the required parking braking force for the target vehicle is achieved.

[0053] The valve body 11 is located at the center of the hydraulic handbrake valve 10. The valve body 11 provides physical support and mounting position for internal components such as the valve core 12, balance spring 13, and sealing ring 16.

[0054] This application discloses a hydraulic handbrake valve 10, which comprises a valve body 11, a valve core 12, a drive mechanism, and a force transmission mechanism. The drive mechanism includes a pull rod 23 and a cam 14, and the force transmission mechanism includes a valve stem 18 and a roller 21. The valve body 11 has three oil passage interfaces: an inlet 111, an outlet 113, and a return port 112, and internally contains a valve core 12 cavity. The pull rod 23 is connected to the cam 14, driving the valve stem 18 to push the valve core 12. The valve stem 18 and the valve core 12 are connected by a balance spring 13, which makes the pressure at the outlet 113 controllable. The valve core 12 and its cavity are sealed by a sealing ring 16. The pull rod 23 can be locked in two positions or rotated from one position to another. When the pull rod 23 is in the first position, the outlet 113 has high pressure; when the pull rod 23 is in the second position, the outlet 113 is in an unloaded state. As the lever 23 rotates from the first position to the second position, hydraulic oil flows from the outlet 113 to the return port 112, and the pressure at the outlet 113 gradually decreases with the rotation angle of the lever 23. As the lever 23 rotates from the second position to the first position, hydraulic oil flows from the inlet 111 to the outlet 113, and the pressure at the outlet 113 gradually increases with the rotation angle of the lever 23. The hydraulic handbrake valve 10 of this application, by setting the inlet 111, return port 112, and outlet 113, and introducing the application of a balance spring 13, simplifies the internal structure of the hydraulic handbrake valve 10 and reduces the number of parts, while effectively controlling the external dimensions, thus improving the production cost and assembly efficiency of the hydraulic handbrake valve 10. At the same time, it makes the hydraulic handbrake valve 10 more suitable for the spatial layout requirements of light trucks.

[0055] In an exemplary embodiment, the valve body 11 has a valve core 12 cavity, with a first end and a second end of the valve core 12 cavity being conductive. The valve body 11, valve core 12, and sealing ring 16 cooperate to form a seal. The valve body 11 has an oil inlet 111, an oil return port 112, an oil outlet 113, and a valve body flange 114. The oil inlet 111 and oil return port 112 are respectively located on the side walls of the valve body 11 on two opposite sides. The oil return port 112 and oil outlet 113 are respectively connected to the outside, with the oil outlet 113 located at the end of the valve body 11 away from the cover 27. The longitudinal height of the oil return port 112 is higher than the longitudinal height of the oil inlet 111. The oil inlet 111, oil return port 112, and oil outlet 113 are interconnected through the valve core 12 cavity. The oil inlet 111, oil return port 112, and oil outlet 113 are all provided with internal threads. The internal threads of the oil inlet 111 and oil return port 112 are connected to the side wall of the valve body 11, and the internal thread of the oil outlet 113 is connected to the connector 20. The oil inlet 111, oil return port 112, and oil outlet 113 provided on the valve body 11 can cooperate with the valve core 12 to realize the switching and control of the hydraulic oil flow path.

[0056] A valve body flange 114 is provided at one end of the valve body 11 near the cover 27. The valve body 11 is fixedly connected to the support 17 and the cover 27 through the valve body flange 114. A first mounting hole is provided on the valve body flange 114 for establishing a connection between the valve body flange 114 and the support 17 and the cover 27. An external mounting hole for connecting to the outside is also provided on the valve body flange 114.

[0057] In an exemplary embodiment, the valve core 12 is disposed in the valve core 12 cavity, and the valve core 12 is also provided with a blind hole 122, a guide hole 123 and a sealing groove 124; the valve core 12 is used to adjust the connection state between the oil inlet 111, the oil return port 112 and the oil outlet 113.

[0058] For example, the valve core 12 can be cylindrical. The valve core 12 is housed within a cavity, restricting its position and movement trajectory to ensure it moves along a fixed axial direction and avoids deviation. Simultaneously, the cavity provides mechanical protection and prevents external impurities from entering the hydraulic system through a sealing design. The first end of the valve core 12 contacts a balance spring 13, which applies a linear force to the valve core 12. This force balances the force exerted by the balance spring 13 on the valve core 12, and the pressure change at the outlet 113 directly corresponds to the compression degree of the balance spring 13, achieving real-time pressure regulation. The second end of the valve core 12 contacts a return spring 19. When the valve core 12 loses external force, the return spring 19 quickly pushes the valve core 12 back to its initial state, ensuring the system returns to its initial state.

[0059] The valve core 12 is also provided with an oil passage groove 121, a blind hole 122, a guide hole 123, and a sealing groove 124. The blind hole 122 is located inside the valve core 12, and its opening points towards the end of the valve core 12 cavity near the oil outlet 113. The oil passage groove 121 and the sealing groove 124 are both provided on the outer peripheral wall of the valve core 12. The oil passage groove 121 is used to connect the hydraulic oil passage, and the sealing groove 124 is used to accommodate the sealing ring 16. The valve core 12 and the valve core 12 cavity are sealed by the sealing ring 16. A guide hole 123 is also provided in the oil passage groove 121 to connect with the blind hole 122, so that hydraulic oil can flow in the oil passage formed by the blind hole 122, the oil passage groove 121, and the guide hole 123.

[0060] In this embodiment, the state of the hydraulic circuit can be switched by moving the position of the valve core 12, such as connecting or disconnecting the oil inlet 111, oil outlet 113 and oil return 112, thereby adjusting the pressure of the oil outlet 113 and realizing the control of the parking brake force.

[0061] In an exemplary embodiment, the hydraulic handbrake valve 10 further includes a sealing ring 16 installed in the sealing groove 124 of the valve core 12 to ensure a seal between the valve core 12 and the valve body 11.

[0062] The sealing ring 16 can be made of high-pressure resistant, wear-resistant, and aging-resistant materials (such as nitrile rubber or fluororubber), ensuring that it maintains stable performance over a long period of time under high pressure, high temperature, and frequent movement. The sealing ring 16 is installed in the sealing groove 124 of the valve core 12, ensuring a seal between the valve core 12 and the valve body 11, preventing hydraulic oil from leaking from the valve core 12 cavity to the outside of the valve body 11 or other unrelated chambers, maintaining stable internal system pressure, and ensuring that the hydraulic oil flows along the designed path.

[0063] In an exemplary embodiment, a balance spring 13 is disposed inside the valve body 11, and the balance spring 13 contacts the valve core 12.

[0064] A balance spring 13 is disposed within the valve body 11. The first end of the balance spring 13 contacts the valve core 12 and is used to adjust the linear position of the valve core 12 by means of its compression force. The second end of the balance spring 13 contacts the valve core 12. The balance spring 13 can compress or release its elastic force as the valve stem 18 moves. That is, when the control lever 23 pushes the valve stem 18 to move, the balance spring 13 compresses or releases in response to the movement of the valve stem 18, and achieves dynamic regulation of hydraulic oil pressure by means of the elastic force acting on the valve core 12.

[0065] In an exemplary embodiment, the hydraulic handbrake valve 10 further includes a return spring 19 for resetting the valve core 12. The return spring 19 is located inside the valve body 11. A first end of the return spring 19 contacts a connector 20, allowing the connector 20 to provide a reaction force fulcrum for the return spring 19, thereby compressing or restoring the spring. The second end of the return spring 19 contacts the valve core 12. When no external force (such as the action of the cam 14 or the lever 23) is applied, the return spring 19 can push the valve core 12 back to its default position, restoring the system to its initial state. This prevents abnormal valve core 12 position due to gravity, vibration, or external interference, thus ensuring the stable operation of the hydraulic handbrake valve 10.

[0066] In an exemplary embodiment, the hydraulic handbrake valve 10 further includes a connector 20 located at the oil outlet 113 of the valve body 11, one end of which contacts the return spring 19. The connector 20 has a central through hole and an internal thread, the central through hole communicating with the oil outlet 113, and the internal thread connecting to the side wall of the valve body 11; the connector 20 also has an external thread for connecting with the internal thread of the oil outlet 113 of the valve body 11. The connector 20 also has a hexagonal structure for tightening.

[0067] In an exemplary embodiment, the hydraulic handbrake valve 10 further includes a support 17 having a valve stem receiving hole 171, the support 17 being used to support the valve stem 18 and provide fixing and guiding functions for the valve stem 18.

[0068] The support 17 supports the valve stem 18 and the cam 14, and provides fixation and guidance for the valve stem 18. The end of the support 17 near the valve body 11 is a flange structure, and the end away from the valve body 11 is a fork arm structure. The flange structure of the support 17 has a valve stem mounting hole 172 for connecting to the valve body 11 and a valve stem receiving hole 171 for accommodating the valve stem 18. The flange structure of the support 17 is bolted to the valve body flange 114. The fork arm structure of the support 17 has a pin receiving hole 173 for accommodating the pin 22, and the two forks of this fork arm structure have a parallel surface structure for limiting the rotation of the valve stem 18. The support 17 also has a stepped surface structure for accommodating the torsion spring 28.

[0069] In an exemplary embodiment, the hydraulic handbrake valve 10 further includes a valve stem 18, which passes through a valve stem receiving hole 171 and contacts a balance spring 13.

[0070] The valve stem 18 can be rectangular on the side near the cam 14 to prevent rotation during operation, while the side away from the cam 14 can be cylindrical to ensure a good fit within the valve core 12 cavity, reducing friction and misalignment. The top of the valve stem 18 near the cam 14 has an opening for housing a roller 21 for connection with the cam 14. The side of the valve stem 18 away from the cam 14 passes sequentially through the valve stem receiving hole 171 of the support 17 and the valve core 12 cavity of the valve body 11, allowing direct contact between the side of the valve stem 18 away from the cam 14 and the balance spring 13. This allows the axial force acting on the valve stem 18 to be transmitted to the balance spring 13, controlling its compression. The movement of the valve stem 18 then drives the valve core 12 to open or close the hydraulic circuit.

[0071] Optionally, the valve body 11 can serve as a mounting base for components such as the locking sleeve 15 and the pull rod 23, and provide positional constraints for these functional components through specific structural designs (such as the first locking hole 271 and the second locking hole 272). The locking state is achieved through the cooperation of the locking sleeve 15, ensuring the vehicle's parking safety. When the lock is released, the valve body 11 ensures that the system can switch to a flowing or pressurized state.

[0072] In an exemplary embodiment, the hydraulic handbrake valve 10 further includes a roller 21, installed in an open hole at the top end of the valve stem 18 near the cam 14. The roller 21 contacts the working surface of the cam 14 to transmit force. Under the force of the cam 14, the roller 21 converts the rotational motion into the axial linear motion of the valve stem 18, achieving precise actuation of the valve core 12. The roller 21 can be configured as a cylindrical or spherical component, which can reduce the friction between the cam 14 and the valve stem 18. Specifically, the roller 21 can reduce the frictional force on the top end of the valve stem 18 when the cam 14 rotates, improving the overall structural durability.

[0073] In an exemplary embodiment, the hydraulic handbrake valve 10 further includes: a cam 14 for driving the valve core 12 to move linearly, thereby adjusting the hydraulic oil circuit; and a locking sleeve 15 for locking or unlocking the valve core 12. When the locking sleeve 15 is in a first state, the cam 14 drives the valve core 12 to descend, causing the oil inlet 111 to disconnect from the oil return port 112. The oil inlet 111 and the oil outlet 113 are connected through the oil passage groove 121, and hydraulic oil flows into the oil outlet 113, thereby increasing the pressure at the oil outlet 113.

[0074] The first state of the locking sleeve 15 refers to the state in which the locking sleeve 15 is pulled up and the lever 23 can move within the locking groove 273 of the cover 27.

[0075] For example, cam 14 is disposed between the two forks of the fork structure of support 17. Cam 14 is connected to support 17 via pin 22, and the working surface of cam 14 contacts roller 21. The axis of cam 14 is provided with a central hole for receiving pin 22. Pin 22 can pass through the central hole and the pin receiving hole 173 on the fork structure of support 17, so that cam 14 can rotate on support 17. Specifically, pin 22 is installed in the pin receiving hole 173 of support 17 and passes through the central hole of cam 14.

[0076] The cam 14 has a second mounting hole on its side that connects to one end of the torsion spring 28. A portion of the circumferential surface of the cam 14 is machined into a flat surface, which can contact the roller 21 to create a stable force-bearing surface, thereby converting the rotational motion of the cam 14 into the linear motion of the valve stem 18. The cam 14 also has an internally threaded hole for connection with the pull rod 23. The cam 14 connects to the pull rod 23 through this internally threaded hole, allowing the movement of the pull rod 23 to drive the rotation of the cam 14. The internal thread design of this hole ensures a secure connection between the pull rod 23 and the cam 14, while also facilitating assembly and maintenance.

[0077] In an exemplary embodiment, the hydraulic handbrake valve 10 further includes a torsion spring 28, which is sleeved on the pin 22 and disposed between the cam 14 and one side fork arm of the support 17. One end of the torsion spring 28 is installed in a second mounting hole of the cam 14, and the other end of the torsion spring 28 is engaged with the fork arm of the support 17. The torsion spring 28 provides a restoring force to the cam 14, allowing the cam 14 to return to its initial position after the external force is removed. The restoring function of the torsion spring 28 ensures that the system returns to its default state after operation, preventing accidental action.

[0078] In an exemplary embodiment, the hydraulic handbrake valve 10 further includes a locking sleeve 15, which is used to lock or release the valve core 12. The first end of the locking sleeve 15 is a cylinder with an integrated stepped surface, and the second end of the locking sleeve 15 is a flange structure. An annular groove is formed on the end face of the second end of the locking sleeve 15.

[0079] The locking sleeve 15 has a locking through hole at its center, and the interior of the locking through hole has a stepped surface. The locking sleeve 15 can be sleeved onto the upper side of the pull rod 23 through the locking through hole. The first end of the locking sleeve 15 contacts the hexagonal structure of the pull rod 23. The second end of the locking sleeve 15 is a flange structure, and the end face of the flange structure has an annular groove for connecting with the handball 26.

[0080] The locking sleeve 15, through its structure and its cooperation with the pull rod 23, ensures that the system can stably and reliably fix the position of the pull rod 23 when locking is required, thereby realizing the parking function. Through the combination of the stepped surface inside the locking through hole, the flange structure, the locking through hole and the hexagonal structure of the pull rod 23, the locking sleeve 15 can be firmly connected with other components, providing efficient mechanical force transmission and control, making the hydraulic handbrake valve 10 more precise and stable when switching between the working state and the parking state.

[0081] The pull rod 23 can be cylindrical, with one end having an external thread and the other end having a groove to accommodate the retaining ring 25. The middle part of the pull rod 23 has a hexagonal structure. The pull rod 23 is connected to a convex connector at one end via the external thread, and is used to adjust the position of the valve core 12 and adjust the oil circuit connection between the oil inlet 111, the oil return port 112, and the oil outlet 113.

[0082] The hydraulic handbrake valve 10 also includes a locking spring 24, which is installed in the locking through hole of the locking sleeve 15 and is sleeved on the upper side of the pull rod 23. One end of the locking spring 24 contacts the stepped surface inside the locking through hole, and the other end of the locking spring 24 contacts the retaining ring 25.

[0083] The retaining ring 25 is installed in the groove of the pull rod 23, and the lower side of the retaining ring 25 contacts the locking spring 24. This ensures that one end of the locking spring 24 is in contact with the retaining ring 25, thereby fixing the locking spring 24 in a proper position during system operation and preventing the locking spring 24 from loosening or shifting.

[0084] In an exemplary embodiment, the hydraulic handbrake valve 10 further includes a hand ball 26, which is connected to the locking sleeve 15 via an interference fit, for manually operating the locking sleeve 15 to lock or unlock. One side of the hand ball 26 is a spherical structure, and the other side of the hand ball 26 is a cylindrical structure, with a smooth transition between the spherical structure and the cylindrical structure.

[0085] The cylindrical structure has a central ball joint to accommodate the pull rod 23 and the retaining ring 25, and an annular protrusion on its cylindrical end face. The ball joint 26 is fixedly connected to the locking sleeve 15 by an interference fit through the annular protrusion and the annular groove of the locking sleeve 15. This interference fit with the locking sleeve 15 allows for manual operation of the locking sleeve 15 to lock or unlock.

[0086] In an exemplary embodiment, the hydraulic handbrake valve 10 further includes a cover 27 fixed to the valve body 11. The cover 27 is a housing with an opening at the bottom, and the upper side of the housing has an arc-shaped structure. The arc surface of the arc-shaped structure has a first locking hole 271 and a second locking hole 272, which are connected by a locking groove 273. The diameter of the first locking hole 271 and the second locking hole 272 is larger than the outer diameter of the cylinder at the first end of the locking sleeve 15, the outer diameter of the cylinder at the first end of the locking sleeve 15 is larger than the width of the locking groove 273, and the width of the locking groove 273 is larger than the outer diameter of the pull rod 23. The cover 27 is connected to the valve body flange 114 of the valve body 11 by bolts.

[0087] In the aforementioned hydraulic handbrake valve 10, when the locking sleeve 15 is located in the first locking hole 271 of the cover 27, the oil passage groove 121 of the valve core 12 and the return port 112 are connected, and at the same time, the blind hole 122 of the valve core 12 and the outlet port 113 are connected, thus forming a passage between the return port 112 and the outlet port 113, allowing the oil to flow, so that the outlet port 113 is in an unloaded state.

[0088] When the locking sleeve 15 is pulled up, the locking sleeve 15 moves out of the first locking hole 271 of the cover 27, and the pull rod 23 can move freely in the locking groove 273 of the cover 27, thereby releasing the locking state. The movement of the pull rod 23 drives the cam 14 to rotate, and the rotation of the cam 14 pushes the valve stem 18 to move downward, which in turn pushes the valve core 12 to move downward, so that the oil passage groove 121 and the oil return port 112 of the valve core 12 are disconnected. At this time, the oil outlet 113, the oil return port 112 and the oil inlet 111 are all in the disconnected state.

[0089] As the valve core 12 continues to move downwards until it connects with the oil passage groove 121 and the oil inlet 111, the hydraulic oil in the oil inlet 111 enters the oil outlet 113 through the blind hole 122 and the valve core 12 cavity, and the pressure gradually increases. This pressure acts on the lower end of the valve core 12, generating an upward thrust. When the upward thrust exceeds the expansion force of the balance spring 13, the balance spring 13 is compressed, causing the valve core 12 to move upwards, thereby disconnecting the oil passage groove 121 from the oil inlet 111. At this time, the pressure at the oil outlet 113 remains unchanged. Therefore, the pressure at the oil outlet 113 and the compression of the balance spring 13 are in a real-time equilibrium, thus achieving a linear increase in the pressure at the oil outlet 113 as the cam 14 rotates. This process keeps the pressure at the oil outlet 113 in balance with the compression of the balance spring 13, achieving the parking braking force required by the target vehicle, thereby controlling the hydraulic oil pressure and assisting in parking the vehicle.

[0090] When the locking sleeve 15 continues to descend and is located at the second locking hole 272 of the cover 27, the valve core 12 compresses the balance spring 13 to the maximum compression amount, and the pressure at the oil outlet 113 reaches the highest value. At this time, the vehicle is in a parking state, and the hydraulic oil pressure ensures the fixation of the braking system, making it difficult for the vehicle to move.

[0091] As the pull rod 23 moves from the second locking hole 272 to the first locking hole 271 of the cover 27, the valve core 12 moves upward. When the oil passage groove 121 of the valve core 12 connects with the return port 112, the hydraulic oil at the outlet 113 flows to the return port 112. At this time, the pressure at the outlet 113 gradually decreases and is in real-time balance with the compression of the balance spring 13. This achieves a linear decrease in the pressure at the outlet 113 as the cam 14 rotates. This linear pressure change allows the braking force to be released gradually, ensuring that the vehicle can smoothly release the brakes during parking.

[0092] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0093] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A hydraulic handbrake valve, characterized in that, The hydraulic handbrake valve includes: The valve body includes an oil inlet, an oil return port, and an oil outlet; The valve core has an oil passage groove, which is connected to the oil return port and the oil inlet port; A balance spring is used to adjust the movement of the valve core and maintain the oil outlet pressure; When the valve core descends, the oil inlet and the oil return are disconnected, thereby increasing the oil outlet pressure. When the oil outlet pressure and the compression of the balance spring are in equilibrium, the parking braking force required by the target vehicle is achieved.

2. The hydraulic handbrake valve according to claim 1, characterized in that, The hydraulic handbrake valve also includes: The cam is used to drive the valve core to move linearly, so as to adjust the hydraulic oil circuit. Locking sleeve, used to lock or unlock the valve core; When the locking sleeve is in the first state, the cam drives the valve core to descend, causing the oil inlet to disconnect from the oil return port. The oil inlet and the oil outlet are connected through the oil passage groove, and hydraulic oil flows into the oil outlet, thereby increasing the pressure at the oil outlet.

3. The hydraulic handbrake valve according to claim 2, characterized in that, The hydraulic handbrake valve also includes: When the pressure at the oil outlet is greater than the expansion force of the balance spring, the balance spring drives the valve core to rise, causing the oil passage groove to disconnect from the oil inlet, so that the pressure at the oil outlet and the compression of the balance spring are in balance.

4. The hydraulic handbrake valve according to claim 2, characterized in that, The first end of the locking sleeve is a cylinder with an integrated stepped surface, and the second end of the locking sleeve is a flange structure with an annular groove on the end face of the second end of the locking sleeve.

5. The hydraulic handbrake valve according to claim 1, characterized in that, The valve body is provided with a valve core cavity; the valve body is provided with an oil inlet, an oil return port, an oil outlet and a valve body flange, and the oil inlet, oil return port and oil outlet are interconnected through the valve core cavity.

6. The hydraulic handbrake valve according to claim 5, characterized in that, The valve core is disposed inside the valve core cavity, and the valve core is also provided with blind holes, guide holes and sealing grooves; the valve core is used to adjust the connection state between the oil inlet, oil return port and oil outlet.

7. The hydraulic handbrake valve according to claim 6, characterized in that, The hydraulic handbrake valve also includes: A sealing ring is installed in the sealing groove of the valve core to ensure a seal between the valve core and the valve body.

8. The hydraulic handbrake valve according to claim 1, characterized in that, The balance spring is located inside the valve body and is in contact with the valve core.

9. The hydraulic handbrake valve according to claim 1, characterized in that, The hydraulic handbrake valve also includes: The support has a valve stem receiving hole, which is used to support the valve stem and provide fixing and guiding functions for the valve stem.

10. The hydraulic handbrake valve according to claim 9, characterized in that, The hydraulic handbrake valve also includes: The valve stem passes through the valve stem receiving hole and contacts the balance spring.

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