Trigger structure of brake valve

Abstract

The utility model provides a trigger structure of a brake valve, and belongs to the technical field of hydraulic pressure. The problem that an existing main valve element is poor in moving stability is solved. According to the trigger structure of the brake valve, the brake valve comprises a valve body, a main valve element is slidably connected to an inner cavity of the valve body, the trigger structure comprises a push rod, a mounting hole is formed in the end face, close to the push rod, of the main valve element, the trigger structure further comprises a valve sleeve and an auxiliary valve element slidably connected into the mounting hole, and a pressure cavity is formed between the auxiliary valve element and the hole wall of the mounting hole. One end of the push rod is fixedly connected with a valve sleeve, the valve sleeve extends into the pressure cavity and is connected with the auxiliary valve element, an inflow hole and an outflow hole are formed in the main valve element, the auxiliary valve element can block the outflow hole, and a pressure building oil way communicating the inflow hole with the pressure cavity is arranged in the auxiliary valve element; the auxiliary valve element can block the inflow hole, and an unloading oil way communicating with the outflow hole and the pressure cavity is arranged in the auxiliary valve element. The brake valve has the advantages that power-assisted braking is achieved, and the moving stability of the main valve element is improved.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic technology and relates to a triggering structure for a brake valve. Background Technology

[0002] The brake valve is a key component of a hydraulic braking system. Its main function is to control the flow and pressure of hydraulic oil. Its working principle is based on the fundamental principles of hydraulics. When the driver depresses the brake pedal, hydraulic oil is pushed into the brake valve. The movement of the valve regulates the pressure and flow of the oil, thereby controlling the movement of the brakes, such as brake pads or brake drums, to decelerate and stop the vehicle. The structure that drives the valve and piston movement via the brake pedal is the triggering mechanism of the brake valve.

[0003] The existing brake valve includes a valve body, in which a piston assembly for controlling the flow of hydraulic fluid is installed. The triggering structure includes a push rod, one end of which is connected to the brake pedal, and the other end of which is installed in the valve body. When the driver presses the brake pedal, the force is applied to the valve through the push rod, thereby causing the valve to move.

[0004] It is evident that the initial movement of the valve is driven by the force applied manually to the brake pedal. However, the direction of the force applied to the valve via the push rod is prone to deviation, which affects the stability of the valve's movement. To improve the stability of the valve's movement, those skilled in the art can easily conceive of setting a spring assembly between the push rod and the valve, so that the force transmitted by the push rod acts on the valve through the spring assembly. For example, Chinese patent literature discloses a hydraulic brake valve for engineering machinery vehicles, CN202221738475.7. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in the prior art by proposing a triggering structure for a brake valve that solves the problem of poor movement stability of the main valve core while achieving assisted braking.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A triggering structure for a brake valve, the brake valve comprising a valve body having an inlet oil passage and a return oil passage, a main valve core slidably connected to the inner cavity of the valve body, and a triggering structure comprising a push rod, characterized in that the main valve core has an installation hole on its end face near the push rod, the triggering structure further comprising a valve sleeve and an auxiliary valve core slidably connected within the installation hole, a pressure chamber being formed between the auxiliary valve core and the wall of the installation hole, one end of the push rod being fixedly connected to the valve sleeve, the valve sleeve extending into the pressure chamber and connected to the auxiliary valve core, the main valve core having an inlet hole connecting the installation hole and the inlet oil passage, and an outlet hole connecting the installation hole and the return oil passage, the auxiliary valve core capable of blocking the outlet hole, and having a pressure-building oil passage connecting the inlet hole and the pressure chamber inside the auxiliary valve core; the auxiliary valve core capable of blocking the inlet hole, and having an unloading oil passage connecting the outlet hole and the pressure chamber inside the auxiliary valve core.

[0008] The main valve core moves within the valve body cavity to regulate the hydraulic pressure. This application includes a mounting hole on the end face of the main valve core, with an auxiliary valve core slidably connected within the mounting hole. A valve sleeve is fixed to the valve sleeve, which is connected to the auxiliary valve core. An operating push rod drives the auxiliary valve core to move relative to the main valve core along the mounting hole. Furthermore, a pressure chamber is provided between the auxiliary valve core and the wall of the mounting hole. The main valve core has an inlet hole connecting the mounting hole and the inlet oil passage, and an outlet hole connecting the mounting hole and the return oil passage. When the auxiliary valve core blocks the outlet hole, the hydraulic oil in the inlet oil passage connects to the pressure chamber through the pressure-building oil passage inside the auxiliary valve core, allowing the hydraulic oil in the inlet oil passage to enter the pressure chamber. This hydraulic oil then acts on one end of the main valve core, driving the main valve core to move. When the auxiliary valve core blocks the inlet hole, the pressure chamber connects to the outlet hole through the unloading oil passage inside the auxiliary valve core, unloading the pressure chamber. As can be seen from the aforementioned structural analysis, this application eliminates the structure where the main valve core is moved by manually applied force. Instead, it utilizes the hydraulic oil inside the valve body to act on one end of the main valve core to drive its movement, thereby improving the stability of the main valve core's movement and achieving assisted braking. The structure where the valve sleeve extends into the pressure chamber and connects to the auxiliary valve core shortens the length of the auxiliary valve core, and since the movement of the auxiliary valve core is based on the wall of the mounting hole, the machining precision of the auxiliary valve core is reduced. Furthermore, it facilitates placing the pressure chamber at one end of the main valve core.

[0009] In the aforementioned triggering structure of the brake valve, the mounting hole includes a flared section and a circular connecting section. The inflow hole and the outflow hole are both opened on the wall of the connecting section and are spaced apart along the axial direction of the connecting section. The diameter of the flared section gradually decreases from the end face of the valve core toward the connecting section, and a limit retaining ring is fixedly connected to the wall of the small end of the flared section. The valve sleeve extends into the flared section and can abut against the limit retaining ring. The inlet and outlet holes are spaced apart along the axial direction of the connecting section, so that they are located on the movement path of the auxiliary valve core. The valve sleeve is extended into the flared section, shortening the installation length of the auxiliary valve core. The end face of the flared section gradually contracts towards the connecting section from the main valve core, ensuring the structural strength of the main valve core while avoiding interference between the main valve core and the valve sleeve. The wall of the flared section and the auxiliary valve core have the aforementioned pressure chamber. This structure increases the working area of ​​one end of the main valve core. The limiting retaining ring limits the maximum stroke that the valve sleeve can move into the mounting hole, further preventing interference between the valve sleeve and the auxiliary valve core or the main valve core.

[0010] In the aforementioned triggering structure of the brake valve, the auxiliary valve core is slidably connected within the connecting section. A return spring is provided within the connecting section. Under the elastic force of the return spring, the auxiliary valve core abuts against the limiting retaining ring, and the end of the auxiliary valve core extends beyond the limiting retaining ring. One end of the auxiliary valve core extending beyond the limiting retaining ring engages with the valve sleeve. The movement of the auxiliary valve core is based on the connecting section. The limiting retaining ring limits the maximum stroke of the auxiliary valve core moving towards the valve sleeve under the elastic force of the return spring. That is, the length of the auxiliary valve core extending beyond the limiting retaining ring is determined, thus determining the initial position of the auxiliary valve core. The engagement of the end of the auxiliary valve core extending beyond the limiting retaining ring with the valve sleeve allows the valve sleeve and the auxiliary valve core to move synchronously, and shortens the set length of the valve sleeve.

[0011] In the aforementioned triggering structure of the brake valve, the auxiliary valve core has a slot at one end extending from the limiting retaining ring, and a hook is provided on the end face of the valve sleeve. The hook is embedded in the slot and can abut against the limiting retaining ring. There is a flow gap between the end face of the auxiliary valve core and the end face of the valve sleeve. The auxiliary valve core has a through hole extending from one end to the other, and the through hole connects the flow gap and the connecting section to form the aforementioned unloading oil passage. Extending the auxiliary valve core out of the limiting retaining ring allows the limiting retaining ring to limit the position of the auxiliary valve core. The hook on the end face of the valve sleeve limits the movement trajectory of the hook by means of the limiting retaining ring, and also allows the end face of the auxiliary valve core and the end face of the valve sleeve to have a flow gap, allowing oil to flow into or out of the pressure chamber through the flow gap. When the auxiliary valve core is in the initial state, the auxiliary valve core blocks the inlet hole, and the pressure chamber is connected to the return oil passage in sequence through the unloading oil passage, the outlet hole, and the return oil passage.

[0012] In the aforementioned triggering structure of the brake valve, a first sealing ring for sealing the inlet hole and a second sealing ring for sealing the outlet hole are fixedly connected to the auxiliary valve core. Both the first and second sealing rings have square cross-sections. The diameter of the inlet hole is smaller than the thickness of the first sealing ring, and the diameter of the outlet hole is smaller than the thickness of the second sealing ring. The distance between the latch and the limiting ring is smaller than the distance between the auxiliary valve core and the bottom of the mounting hole. This structure shortens the opening length within the mounting hole; improves the sealing performance of the first sealing ring on the inlet hole; and improves the sealing performance of the second sealing ring on the outlet hole.

[0013] In the aforementioned triggering structure of the brake valve, an inlet hole that aligns with the inlet hole is provided on the outer wall of the auxiliary valve core. The first sealing ring is located between the inlet hole and the second sealing ring. The inlet hole communicates with the through hole to form the aforementioned pressure-building oil circuit. When the auxiliary valve core moves to the point where the inlet hole aligns with the outlet hole, the oil inlet circuit communicates with the pressure-building oil circuit. By limiting the position of the first sealing ring, the stroke required for the auxiliary valve core to control the opening and closing of the inlet hole is shortened.

[0014] In the aforementioned triggering structure of the brake valve, the outer wall of the auxiliary valve core has an annular relief groove, and the liquid inlet is located at the bottom of the relief groove. There are at least two liquid inlet holes, spaced apart circumferentially around the auxiliary valve core. The relief groove allows for multiple liquid inlet holes, increasing the speed at which liquid enters the pressure-building oil circuit, but also reduces the machining precision required for the liquid inlet holes.

[0015] In the aforementioned triggering structure of the brake valve, the width of the relief groove is greater than the diameter of the inlet hole, the opening of the relief groove is flared, and the inclination angle of the groove wall near the first sealing ring is greater than the inclination angle of the other side of the groove wall. Because the incoming oil is pressurized, by making the width of the relief groove greater than the diameter of the inlet hole and by increasing the inclination angle of one side of the groove wall, the impact of the hydraulic oil on the auxiliary valve core is minimized, and the oil is guided to flow smoothly into the inlet hole.

[0016] In the aforementioned triggering structure of the brake valve, the through hole is a stepped hole, with the smaller end of the through hole facing the valve sleeve and the larger end facing the bottom of the mounting hole. The stepped hole design serves two purposes: firstly, it minimizes the impact on the valve sleeve when hydraulic oil flows into the pressure chamber; secondly, it increases the unloading speed of the pressure chamber.

[0017] In the aforementioned triggering structure of the brake valve, the valve body includes an upper cover fitted over the valve sleeve and sealing the inner cavity opening, with a gap between the upper cover and the main valve core. This structure prevents negative pressure from forming between the upper cover and the main valve core, thus avoiding obstruction of the main valve core's movement.

[0018] Compared with the prior art, the triggering structure of the brake valve provided by this utility model has the following advantages: An installation hole is opened at one end of the main valve core. An inflow hole communicating with the inlet oil passage and an outflow hole communicating with the return oil passage are provided on the cavity wall of the installation hole. An auxiliary valve core is slidably connected within the installation hole. The auxiliary valve core is connected to a push rod via a valve sleeve. The auxiliary valve core moves by operating the push rod. When the auxiliary valve core is in its initial state, it blocks the inflow hole, and the pressure chamber communicates with the outflow hole via an unloading oil passage. When the auxiliary valve core blocks the outflow hole, the inflow hole communicates with the pressure chamber via a pressure-building oil passage. The hydraulic oil in the pressure chamber acts on one end of the main valve core, causing the main valve core to move under the pressure of the oil. That is, the initial movement of the main valve core is assisted by hydraulic oil. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the brake valve.

[0020] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0021] In the diagram, 1. Valve body; 101. Oil inlet passage; 102. Oil return passage; 2. Push rod; 3. Main valve core; 31. Mounting hole; 311. Flared section; 312. Connecting section; 32. Inlet hole; 33. Outlet hole; 4. Valve sleeve; 41. Hook; 5. Auxiliary valve core; 51. Pressure building passage; 52. Unloading passage; 53. Liquid inlet; 54. Relief groove; 55. Slot; 56. Through hole; 6. Pressure chamber; 7. Limiting ring; 8. Return spring; 9. Flow gap; 10. First sealing ring; 11. Second sealing ring. Detailed Implementation

[0022] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0023] like Figure 1 and Figure 2As shown, the triggering structure of this brake valve includes a valve body 1 with an inlet oil passage 101 and a return oil passage 102. The triggering structure includes a push rod 2. A main valve core 3 is slidably connected to the inner cavity of the valve body 1. A mounting hole 31 is provided on the end face of the main valve core 3 near the push rod 2. The triggering structure also includes an auxiliary valve core 5 slidably connected to the mounting hole 31. A pressure chamber 6 is provided between the auxiliary valve core 5 and the wall of the mounting hole 31. A valve sleeve 4 is fixedly connected to one end of the push rod 2, and the valve sleeve 4 extends into the pressure chamber. The main valve core 3 is located inside the pressure chamber 6 and connected to the auxiliary valve core 5. The main valve core 3 is provided with an inflow hole 32 that connects the mounting hole 31 and the oil inlet passage 101, and an outflow hole 33 that connects the mounting hole 31 and the oil return passage 102. The auxiliary valve core 5 can block the outflow hole 33, and the auxiliary valve core 5 has a pressure building passage 51 that connects the inflow hole 32 and the pressure chamber 6. The auxiliary valve core 5 can block the inflow hole 32, and the auxiliary valve core 5 has an unloading passage 52 that connects the outflow hole 33 and the pressure chamber 6.

[0024] The mounting hole 31 includes a flared section 311 and a circular connecting section 312. The inflow hole 32 and the outflow hole 33 are both opened on the connecting section 312 and are spaced apart along the axial direction of the connecting section 312. The diameter of the flared section 311 gradually decreases from the end face of the valve core 3 toward the connecting section 312. A limit ring 7 is fixedly connected to the wall of the small end of the flared section 311. The valve sleeve 4 extends into the flared section 311 and can abut against the limit ring 7. The inner diameter of the flared section 311 is larger than the outer diameter of the valve sleeve 4.

[0025] The auxiliary valve core 5 is slidably connected within the connecting section 312. A return spring 8 is provided within the connecting section 312. Under the elastic force of the return spring 8, the auxiliary valve core 5 abuts against the limiting ring 7, and the end of the auxiliary valve core 5 extends out of the limiting ring 7. A groove 541 is provided at one end of the auxiliary valve core 5 extending out of the limiting ring 7. A hook 41 is provided on the end face of the valve sleeve 4, which is directly opposite to the limiting ring 7. The hook 41 is embedded in the groove 541 and can abut against the limiting ring 7. There is a flow gap 9 between the end face of the auxiliary valve core 5 and the end face of the valve sleeve 4. The auxiliary valve core 5 has a through hole 55 extending from one end to the other end. The through hole 55 connects the flow gap 9 and the connecting section 312 to form the unloading oil passage 52. An inlet hole 531 is provided on the outer wall of the auxiliary valve core 5, which can be aligned with the inlet hole 32. The inlet hole 531 communicates with the through hole 55 to form the pressure building oil passage 51. The outer wall of the auxiliary valve core 5 has an annular relief groove 532, and an inlet hole 531 is formed at the bottom of the relief groove 532. In this embodiment, there are four inlet holes 531. In actual production, the number of inlet holes 531 can be two or six, and the inlet holes 531 are spaced apart around the circumference of the auxiliary valve core 5. The width of the relief groove 532 is greater than the diameter of the inlet hole 32. The opening of the relief groove 532 is flared, and the inclination angle of the groove wall of the relief groove 532 near the first sealing ring 10 is greater than the inclination angle of the groove wall on the other side.

[0026] The through hole 55 is a stepped hole located at the center of the auxiliary valve core 5. The small end of the through hole 55 faces the valve sleeve 4, and the large end of the through hole 55 faces the bottom of the mounting hole 31.

[0027] A first sealing ring 10 for sealing the inlet hole 32 and a second sealing ring 11 for sealing the outlet hole 33 are fixedly connected to the auxiliary valve core 5. The cross-section of the first sealing ring 10 and the second sealing ring 11 is square. The diameter of the inlet hole 32 is smaller than the thickness of the first sealing ring 10, and the diameter of the outlet hole 33 is smaller than the thickness of the second sealing ring 11. The distance between the hook 41 and the limiting ring 7 is smaller than the distance between the auxiliary valve core 5 and the bottom of the mounting hole 31. The first sealing ring 10 is located between the liquid inlet hole 531 and the second sealing ring 11.

[0028] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0029] Although this document frequently uses terms such as valve body 1, oil inlet passage 101, oil return passage 102, push rod 2, main valve core 3, mounting hole 31, flared section 311, connecting section 312, inflow hole 32, outflow hole 33, valve sleeve 4, hook 41, auxiliary valve core 5, pressure building passage 51, unloading passage 52, liquid inlet hole 53, clearance groove 54, retaining groove 55, through hole 56, pressure chamber 6, limit retaining ring 7, return spring 8, flow gap 9, first sealing ring 10, and second sealing ring 11, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A triggering structure for a brake valve, the brake valve comprising a valve body (1) having an inlet oil passage (101) and a return oil passage (102), wherein a main valve core (3) is slidably connected to the inner cavity of the valve body (1), and the triggering structure comprises a push rod (2), characterized in that, The main valve core (3) has a mounting hole (31) on its end face near the push rod (2). The triggering structure also includes an auxiliary valve core (5) slidably connected in the mounting hole (31). There is a pressure chamber (6) between the auxiliary valve core (5) and the wall of the mounting hole (31). One end of the push rod (2) is fixedly connected to a valve sleeve (4). The valve sleeve (4) extends into the pressure chamber (6) and is connected to the auxiliary valve core (5). The main valve core (3) has a connecting mounting hole (31) and an oil inlet. The oil circuit (101) has an inlet hole (32), a connecting mounting hole (31), and an outlet hole (33) of the return oil circuit (102). The auxiliary valve core (5) can block the outlet hole (33), and the auxiliary valve core (5) has a pressure building oil circuit (51) connecting the inlet hole (32) and the pressure chamber (6). The auxiliary valve core (5) can block the inlet hole (32), and the auxiliary valve core (5) has an unloading oil circuit (52) connecting the outlet hole (33) and the pressure chamber (6).

2. The triggering structure of the brake valve according to claim 1, characterized in that, The mounting hole (31) includes a flared section (311) and a circular connecting section (312). The inflow hole (32) and the outflow hole (33) are both opened on the wall of the connecting section (312) and are spaced apart along the axial direction of the connecting section (312). The diameter of the flared section (311) gradually decreases from the end face of the valve core (3) toward the connecting section (312). A limiting ring (7) is fixedly connected to the wall of the small end of the flared section (311). The valve sleeve (4) extends into the flared section (311) and can abut against the limiting ring (7).

3. The triggering structure of the brake valve according to claim 2, characterized in that, The auxiliary valve core (5) is slidably connected in the connecting section (312). The connecting section (312) is provided with a reset spring (8). The auxiliary valve core (5) abuts against the limiting ring (7) under the elastic force of the reset spring (8), and the end of the auxiliary valve core (5) extends out of the limiting ring (7). One end of the auxiliary valve core (5) extending out of the limiting ring (7) is engaged with the valve sleeve (4).

4. The triggering structure of the brake valve according to claim 3, characterized in that, The auxiliary valve core (5) has a slot (541) at one end extending from the limiting retaining ring (7). The valve sleeve (4) has a hook (41) on its end face. The hook (41) is embedded in the slot (541) and can abut against the limiting retaining ring (7). There is a flow gap (9) between the end face of the auxiliary valve core (5) and the end face of the valve sleeve (4). The auxiliary valve core (5) has a through hole (55) extending from one end to the other end. The through hole (55) connects the flow gap (9) and the connecting section (312) to form the unloading oil passage (52).

5. The triggering structure of the brake valve according to claim 4, characterized in that, The auxiliary valve core (5) is fixedly connected to a first sealing ring (10) for sealing the inflow hole (32) and a second sealing ring (11) for sealing the outflow hole (33). The cross-section of the first sealing ring (10) and the second sealing ring (11) is square. The diameter of the inflow hole (32) is smaller than the thickness of the first sealing ring (10). The diameter of the outflow hole (33) is smaller than the thickness of the second sealing ring (11). The distance between the hook (41) and the limiting ring (7) is smaller than the distance between the auxiliary valve core (5) and the bottom of the mounting hole (31).

6. The triggering structure of the brake valve according to claim 5, characterized in that, The auxiliary valve core (5) has an inlet hole (531) on its outer wall that can be aligned with the inlet hole (32). The first sealing ring (10) is located between the inlet hole (531) and the second sealing ring (11). The inlet hole (531) is connected to the through hole (55) to form the pressure building oil circuit (51).

7. The triggering structure of the brake valve according to claim 6, characterized in that, The auxiliary valve core (5) has an annular relief groove (532) on its outer wall. The liquid inlet hole (531) is opened at the bottom of the relief groove (532). The number of liquid inlet holes (531) is at least two, and the two liquid inlet holes (531) are arranged circumferentially around the auxiliary valve core (5).

8. The triggering structure of the brake valve according to claim 7, characterized in that, The width of the relief groove (532) is greater than the diameter of the inflow hole (32), the opening of the relief groove (532) is flared, and the inclination angle of the relief groove (532) near the first sealing ring (10) is greater than the inclination angle of the other side of the groove wall.

9. The triggering structure of the brake valve according to any one of claims 4 to 8, characterized in that, The through hole (55) is a stepped hole, with the small end of the through hole (55) facing the valve sleeve (4) and the large end of the through hole (55) facing the bottom of the mounting hole (31).

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