Floating structure of a brake valve

Abstract

The application provides a floating structure of a brake valve and belongs to the technical field of hydraulic braking. The floating structure of the brake valve solves the problem of low response timeliness of the existing brake valve. The floating structure of the brake valve comprises a valve body, a main piston and an auxiliary piston capable of moving towards the main piston are arranged in the inner cavity of the valve body, the main piston is provided with an oil return flow channel communicated with an oil return hole, the auxiliary piston is provided with an oil passage flow channel communicated with the inner cavity of the valve body and the oil return flow channel, the oil passage flow channel is provided with a first single-component assembly, the floating structure further comprises a valve core arranged between the main piston and the auxiliary piston, the valve core is provided with a floating spring abutting against the auxiliary piston, the auxiliary piston can drive the valve core to move, so that the valve core abuts against the main piston to block the oil return flow channel, and the first single-component assembly is opened through the valve core. The floating structure of the brake valve has the advantages of improving the response timeliness of the brake valve.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of hydraulic braking and relates to a floating structure of a brake valve. BACKGROUND

[0002] The brake valve is a device for controlling the hydraulic braking of an engineering vehicle, which comprises a valve body with an inner cavity, an oil inlet hole communicated with an oil tank and a working oil hole communicated with a brake, a piston assembly for controlling the flow of oil liquid arranged in the valve body and a linkage piston connected with a brake pedal, wherein when the driver steps on the brake pedal, the linkage piston can drive the piston assembly to move to realize braking.

[0003] In the prior art, the brake pedal and the linkage piston are in linkage relationship, and the linkage piston is driven to move by the brake pedal, however, the movement of the piston assembly controls the flow of oil liquid in the inner cavity of the valve body, and the piston assembly is loaded with oil pressure, so it is difficult to drive the piston assembly loaded with oil pressure by artificially stepping on the brake pedal, and in order to facilitate the stepping of the brake pedal, the oil pressure is used, for example, a full hydraulic brake valve CN201620072353.7 disclosed in the Chinese patent document. Specifically, the piston assembly is driven by the oil pressure to facilitate the stepping of the brake pedal, and the oil liquid needs to be controlled by a control valve, so that the oil liquid only acts on the piston assembly after the driver steps on the brake pedal, that is, in order to realize the movement of the piston assembly driven by the oil liquid, a control valve communicated with the brake valve needs to be added, and the movement of the linkage piston is associated with the control valve, and the addition of the structure and the establishment of the oil path association undoubtedly increase the complexity of the oil passage of the brake valve, resulting in the problem of low response timeliness of the brake valve. SUMMARY

[0004] The purpose of the present application is to solve the above-mentioned problems in the prior art, and to provide a floating structure of a brake valve to solve the technical problem of low response timeliness of the brake valve.

[0005] The purpose of the present application can be achieved by the following technical scheme: a floating structure of a brake valve, comprising a valve body, a main piston and an auxiliary piston arranged in the inner cavity of the valve body and movable towards the main piston, characterized in that the main piston has a return oil flow channel communicated with a return oil hole, the auxiliary piston has a oil flow channel communicated with the inner cavity of the valve body and the return oil flow channel, the oil flow channel is provided with a first single-component assembly, the floating structure further comprises a valve core arranged between the main piston and the auxiliary piston, the valve core is provided with a floating spring abutting against the auxiliary piston, and the auxiliary piston can drive the valve core to move, so that the valve core abuts against the main piston to block the return oil flow channel, and the first single-component assembly is opened through the valve core.

[0006] The auxiliary piston is connected with the brake pedal in the prior art. In the present application, the first single-component is arranged in the oil passage to control the oil flow, i.e. when the first single-component is in the closed state, the oil entering the inner cavity of the valve body can be stored in the auxiliary piston, when the driver steps on the brake pedal, the auxiliary piston drives the valve core to move towards the main piston, and then the valve core abuts against the main piston, as the auxiliary piston continues to move towards the main piston, the floating spring is compressed, the valve core moves relative to the auxiliary piston and opens the first single-component, because the oil return passage has been blocked by the valve core, the opening of the first single-component makes the oil continuously move towards the main piston through the oil passage, so that the oil entering the inner cavity of the valve body builds pressure at one end of the main piston, and then the main piston moves under the pressure of the oil, until the main piston moves to the required brake stroke, and in this process, only the force applied on the brake pedal to move the auxiliary piston with the main piston is needed. As can be seen, on the one hand, there is no direct linkage between the movement of the auxiliary piston and the movement of the main piston, i.e. the movement of the auxiliary piston driven by the pedal does not drive the main piston to move, avoiding the load of the oil pressure in the inner cavity of the valve body by the movement of the auxiliary piston, on the other hand, the valve core is arranged between the main piston and the auxiliary piston, so that the valve core simultaneously bears the functions of opening the first single-component and blocking the oil return passage, i.e. the valve core moves relative to the main piston to block the oil return passage, and the valve core also moves relative to the auxiliary piston to open the first single-component by virtue of the characteristic that the main piston is not moving at this time, it can be seen that the opening of the first single-component and the blocking of the oil return passage are synchronous, and when the driver releases the brake pedal, the auxiliary piston drives the valve core to move back, unblocks the oil return passage blocked by the valve core, releases the oil pressure acting on one end of the main piston, reduces the resistance of the main piston to move back, and avoids the delay of the main piston to move back. In summary, the driver can conveniently drive the main piston to move, and make the main piston quickly move back after releasing the brake pedal, thereby improving the responsiveness of the brake valve.

[0007] In the floating structure of the brake valve, the valve core is in a strip shape and is arranged in the oil flow channel, the valve core is located between the first single component and the main piston, the auxiliary piston is provided with a limiting piece for limiting the valve core from being taken out of the oil flow channel, the floating spring is sleeved outside the valve core and one end of the floating spring abuts against the first single component, the other end of the floating spring abuts against the valve core to make the valve core abut against the limiting piece, and gaps exist between the valve core and the first single component and between the valve core and the main piston. The auxiliary piston is connected with the brake pedal in the prior art, the brake pedal determines the position of the auxiliary piston, the floating spring and the limiting piece position the valve core in the oil flow channel, the gap between the valve core and the first single component and the gap between the valve core and the main piston are determined, when the auxiliary piston moves, the valve core moves towards the main piston along with the auxiliary piston, and the gap between the valve core and the main piston is eliminated, when the valve core abuts against the main piston, the auxiliary piston continues to move towards the main piston, the valve core does not move, the first single component moves towards the valve core against the elastic force of the floating spring, the gap between the valve core and the first single component is eliminated, and the valve core opens the first single component. It can be seen that the auxiliary piston can drive the valve core to move and can move relative to the valve core, the valve core integrates two functions which are not related to each other, oil inlet and oil return are synchronously controlled, and therefore the response and timeliness of the brake valve are improved.

[0008] In the floating structure of the brake valve, the first single component has a pushing part for opening the first single component at one end and has a blocking part for blocking the oil return channel at the other end, the valve body has a moving stroke for the auxiliary piston to move towards the main piston, and the moving stroke is greater than the sum of the gaps between the blocking part and the main piston and between the pushing part and the first single component. When the blocking part abuts against the main piston to block the oil return channel, the auxiliary piston and the main piston still have the moving stroke for moving towards the main piston, when the auxiliary piston continues to move towards the main piston, the valve core does not move, the first single component moves towards the valve core, and then the first single component is opened by the pushing part. The structure makes the linkage between components through structural design, shortens the oil flow path on the premise that the oil pressure assists the main piston to move, and improves the response and timeliness of the brake valve.

[0009] In the floating structure of the brake valve, the first single-component assembly comprises a valve seat separating the oil flow channel into an oil inlet cavity and an oil outlet cavity, the valve seat is threadedly connected with the inner wall of the oil flow channel, the valve seat is provided with an oil passing hole communicating the oil inlet cavity and the oil outlet cavity, the oil inlet cavity is provided with a ball core and a pressure spring abutting against the ball core to block the oil passing hole, the valve core is arranged in the oil outlet cavity, and the floating spring abuts against the valve seat to form a gap between the valve core and the ball core. The valve core is arranged in the oil flow path, thereby improving the compactness of the brake valve. When the oil passing hole is blocked, the oil flowing from the control oil hole is stored in the oil inlet cavity, and the valve seat is located between the ball core and the valve core, so that the opening mode of the first single-component assembly is clear, i.e. the opening mode is to push the ball core by the valve core, the gap between the valve core and the ball core can be adjusted by adjusting the position of the valve seat, and the gap between the valve core and the ball core is ensured to be in a suitable range, thereby ensuring the opening timeliness of the first single-component assembly while reducing the assembly precision of the components. In another embodiment, the valve seat and the auxiliary piston can be arranged in an integrated structure.

[0010] In the floating structure of the brake valve, the oil return flow channel comprises an inflow hole arranged on the end face of the main piston, the blocking part is in the shape of a truncated cone, the diameter of the inflow hole is greater than the diameter of the small end of the blocking part and less than the diameter of the large end of the blocking part, and the small end of the blocking part is located in the inflow hole. The inflow hole is arranged on the end face of the main piston, and when the blocking part blocks the inflow hole, the oil pressure acts on one end of the main piston, thereby facilitating the stability of the movement of the main piston. Meanwhile, due to the structure of the blocking part in the shape of a truncated cone, when the inflow hole is not blocked, the blocking part is located in the inflow hole, so that the movement of the valve core can ensure that the inflow hole is blocked by the blocking part, thereby improving the response timeliness of the brake valve under the premise of ensuring the stability of the brake valve. Meanwhile, the tapered surface sealing enables the blocking part to quickly unblock the inflow hole when the brake is contacted, so that the pressure acting on the end face of the main piston for driving the movement of the main piston is removed, thereby avoiding the delay of the movement of the main piston, so that the braking performance can be ensured when the driver steps on the brake pedal within a short time, thereby further improving the response timeliness of the brake valve.

[0011] In the floating structure of the brake valve, the valve seat has a limiting surface for abutting against the floating spring, the limiting surface is provided with a groove, the oil passing hole is arranged at the groove bottom, the pushing part is in the shape of a rod and arranged in the groove, the diameter of the pushing part is less than the diameter of the oil passing hole, and the length of the pushing part is greater than the height of the valve seat. The oil passing hole is arranged at the groove bottom, and the pushing part is arranged in the groove, so that the valve core is aligned with the valve ball, and the arrangement position of the valve core is further clear based on the valve seat, thereby ensuring the opening stability of the first single-component assembly when the auxiliary piston moves relative to the valve core.

[0012] In the floating structure of the brake valve, the oil outlet cavity has a necked section communicated with the oil inlet cavity and an expanded section extending to the end face of the auxiliary piston, the inner diameter of the necked section is larger than that of the oil inlet cavity and smaller than that of the expanded section, the expanded section is connected with the necked section to form an inclined flow expansion surface, and the outer wall of the valve core has a flow guide groove for the oil to pass through. When the first single component is opened, the oil passing through the first single component is guided by the cooperation of the flow expansion surface, the expanded section and the flow guide groove, in other words, this structure not only avoids the impact of oil on the valve core as much as possible, but also guides the oil by the cooperation of the valve core and the expanded section, ensuring the positional relationship between the valve core and the first single component and the main piston.

[0013] In the floating structure of the brake valve, the valve core has a connecting portion in a columnar shape and connected with the pushing portion and the blocking portion at both ends, the outer wall of the connecting portion protrudes at least two symmetrically arranged stop edges, the limiting piece is a stop ring embedded in the expanded section, the floating spring is sleeved outside the connecting portion and abuts against the stop edges to make the stop edges abut against the stop ring, and the stop edges and the oil flow channel have a floating gap therebetween. The connecting portion limits the movement of the floating spring, the stop ring supports the stop edges, and the valve core is positioned between the valve seat and the stop ring. When the oil passes through the oil flow channel, the floating gap avoids the valve core and the oil flow channel from being stuck, ensuring the stability of the movement of the valve core and the responsiveness and timeliness of the brake valve.

[0014] In the floating structure of the brake valve, the number of the stop edges is four, the four stop edges are arranged at intervals along the circumference of the connecting portion, and adjacent two stop edges are connected and form the flow guide groove, the cross section of the flow guide groove is arc-shaped, the inflow hole and the oil passing hole are arranged opposite to each other, and the pushing portion and the blocking portion are coaxially arranged. The flow of the oil is guided by the flow guide groove, the arc-shaped structure avoids the impact of the oil on the valve core as much as possible, the pushing portion and the blocking portion are coaxially arranged, the balance of the valve core is easily ensured, and the pushing portion is aligned with the oil passing hole and the blocking portion is aligned with the inflow hole.

[0015] In the floating structure of the brake valve, the valve body inner cavity comprises a control cavity and an oil return cavity coaxially arranged, the cavity wall of the control cavity is provided with a control oil hole, the cavity wall of the oil return cavity is provided with an oil return hole, the inner diameter of the oil return cavity is larger than that of the control cavity, the auxiliary piston is arranged in the control cavity, the main piston is arranged in the oil return cavity, and the oil return flow channel is arranged on the side wall of the main piston. The oil liquid is introduced from the control oil hole and flows out from the oil return hole. The auxiliary piston is arranged in the control cavity provided with the control oil hole, so that the oil liquid flow must pass through the auxiliary piston. Therefore, the oil flow path is arranged according to the flow path of the oil liquid in the valve body, and the inner diameter of the oil return cavity is larger than that of the control cavity, which means that the diameter of the main piston is larger than that of the auxiliary piston. After the oil return flow channel is blocked, the oil liquid in the valve body inner cavity is pressurized in the oil return cavity, so that the area of the oil liquid acting on the main piston is larger, and the moving speed of the main piston per unit time is improved.

[0016] Compared with the prior art, the floating structure of the brake valve has the following advantages:

[0017] 1. The application controls the oil liquid pressure to drive the main piston to move, which greatly reduces the pressure required to be applied to the brake pedal compared with the prior art of driving the piston to move by the brake pedal.

[0018] 2. The oil flow channel is arranged on the auxiliary piston and communicates the control oil hole and the oil return flow channel, and the first single component for controlling the on-off of the oil liquid is arranged in the oil flow channel. When the driver steps on the brake pedal, the auxiliary piston drives the valve core to block the oil return flow channel, and the first single component is opened, so that one end of the main piston is pressurized, and the oil liquid pressure drives the main piston to move. When the driver releases the brake pedal, the auxiliary piston drives the valve core to move back, the valve core unblocks the oil return flow channel, and the first single component is closed. The opening of the first single component and the blocking of the oil return flow channel are synchronized through structural linkage, which improves the response and timeliness of the brake valve compared with the step-by-step response structure in the prior art.

[0019] 3. Compared with the prior art of realizing the conduction of the oil channel by the movement of the piston and then opening the first single component by the bypass oil channel through the oil liquid pressure, the application realizes the opening of the first single component and the blocking of the oil return flow channel by the valve core at the same time, so that the conduction of the oil channel and the opening of the first single component are synchronized. After the brake is finished, the first single component is moved back by the back movement of the auxiliary piston, so that the oil channel is depressurized in time, the load required to be borne by the brake valve during back movement is reduced as much as possible, and the brake response and timeliness of the brake valve are improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a sectional view of the brake valve when the brake pedal is not stepped on.

[0021] Figure 2 is Figure 1 a partial enlarged view of the valve core.

[0022] Figure 3 is a sectional view of the brake valve when the brake pedal is depressed.

[0023] Figure 4 is Figure 3 a partial enlarged view of the valve core.

[0024] Figure 5 is a schematic view of the overall structure of the valve core.

[0025] Figure 6 is a schematic view of the overall structure of the brake valve.

[0026] In the figure, 1, valve body; 11, inner cavity; 111, control cavity; 112, oil return cavity; 12, control oil hole; 13, oil return hole; 131, oil supply cavity; 132, working cavity; 14, moving stroke; 15, oil inlet hole; 16, working oil hole; 2, main piston; 21, oil return flow channel; 211, inflow hole; 212, outflow hole; 3, auxiliary piston; 31, oil passage flow channel; 311, oil inlet cavity; 312, oil outlet cavity; 313, necked section; 314, flared section; 315, flow expansion surface; 4, first single component; 41, valve seat; 411, oil passage hole; 412, limiting surface; 413, groove; 42, ball core; 43, pressure spring; 5, valve core; 51, push part; 52, blocking part; 53, flow guide groove; 54, engagement part; 541, blocking edge; 55, floating gap; 6, limiting member; 7, floating spring; 8, brake pedal; 9, balance piston; 91, balance oil channel; 92, pressure relief oil channel; 10, pedal link assembly; 101, sealing assembly; 102, second single component; 103, third single component; 104, second sealing ring; 105, return spring; 106, movable rod. DETAILED DESCRIPTION

[0027] The following is a specific embodiment of the present application and further describes the technical solutions of the present application in conjunction with the drawings, but the present application is not limited to these embodiments.

[0028] As Figures 1-4As shown, the floating structure of the brake valve comprises a valve body 1 with an inner cavity 11, the valve body 1 is sequentially provided with a control oil hole 12, an oil return hole 13, an oil inlet hole 15 and a working oil hole 16 along the axial direction of the inner cavity 11, the inner cavity 11 comprises a control cavity 111 communicated with the control oil hole 12 and an oil return cavity 112 communicated with the oil return hole 13, the oil return cavity 112 is coaxially arranged with the control cavity 111, and the inner diameter of the oil return cavity 112 is larger than that of the control cavity 111, the oil return cavity 112 is provided with a main piston 2 separating the oil return cavity 112 into two chambers, the control cavity 111 is provided with an auxiliary piston 3 movable towards the main piston 2, the control oil hole 12 is arranged on the cavity wall of the control cavity 111, and the oil return hole 13 is arranged on the cavity wall of the oil return cavity 112. The auxiliary piston 3 has an oil passage 31 communicated with the control oil hole 12 and an oil return passage 21, the oil passage 31 is provided with a first single-component assembly 4, the main piston 2 has the oil return passage 21 communicated with the oil return hole 13, and the floating structure further comprises a valve core 5 abutting against the main piston 2 to block the oil return passage 21, the auxiliary piston 3 can drive the valve core 5 to move, so that the valve core 5 abuts against the main piston 2 to block the oil return passage 21 and open the first single-component assembly 4.

[0029] As shown, Figure 5 The valve core 5 is in the shape of a long strip and is arranged in the oil passage 31, the valve core 5 is located between the first single-component assembly 4 and the main piston 2, one end of the first single-component assembly 4 has a pushing part 51 for opening the first single-component assembly 4, and the other end has a blocking part 52 for blocking the oil return passage 21, the auxiliary piston 3 is provided with a limiting part 6 limiting the valve core 5 from coming out of the oil passage 31, the valve core 5 is provided with a floating spring 7 abutting against the first single-component assembly 4 at one end, and the other end of the floating spring 7 abuts against the valve core 5 to make the valve core 5 abut against the limiting part 6, there are gaps between the valve core 5 and the first single-component assembly 4 and between the valve core 5 and the main piston 2, the length of the oil return cavity 112 is greater than that of the control cavity 111, so that the inner cavity 11 has a moving stroke 14 for the auxiliary piston 3 to move towards the main piston 2, and the moving stroke 14 is greater than the sum of the gaps between the blocking part 52 and the main piston 2 and between the pushing part 51 and the first single-component assembly 4.

[0030] The oil return flow channel 21 comprises an inflow hole 211 formed on one end face of the main piston 2 and an outflow hole 212 formed on the side wall of the main piston 2. The blocking part 52 is frustoconical, the hole diameter of the inflow hole 211 is greater than the diameter of the small end of the blocking part 52 and less than the diameter of the large end of the blocking part 52, and the small end of the blocking part 52 is located in the inflow hole 211. In the embodiment, the first single-component assembly 4 comprises a valve seat 41 which is threadedly connected with the inner wall of the oil flow channel 31, and in actual production, the valve seat 41 can be in an integrated structure with the auxiliary piston 3. The valve seat 41 divides the oil flow channel 31 into an oil inlet cavity 311 and an oil outlet cavity 312, and the valve seat 41 is provided with an oil passing hole 411 which communicates the oil inlet cavity 311 and the oil outlet cavity 312. The valve seat 41 has a limiting surface 412 on which a recess 413 is formed, and the oil passing hole 411 is formed at the bottom of the recess 413. The pushing part 51 is rod-shaped and is arranged in the recess 413, the diameter of the pushing part 51 is less than the hole diameter of the oil passing hole 411, and the length of the pushing part 51 is greater than the height of the valve seat 41. The oil inlet cavity 311 is provided with a ball core 42 and a pressure spring 43 which abuts against the ball core 42 to block the oil passing hole 411. The valve core 5 is arranged in the oil outlet cavity 312, and the floating spring 7 abuts against the valve seat 41 to make the valve core 5 and the ball core 42 have a gap.

[0031] The oil outlet cavity 312 has a necked section 313 which communicates with the oil inlet cavity 311 and an expanded section 314 which extends to the end face of the auxiliary piston 3. The inner diameter of the necked section 313 is greater than the inner diameter of the oil inlet cavity 311 and less than the inner diameter of the expanded section 314. The expanded section 314 is connected with the necked section 313 to form an expanded flow surface 315 which is arranged obliquely. The valve core 5 has a connecting part 54 which is columnar and has two ends connected with the pushing part 51 and the blocking part 52 respectively. In the embodiment, the outer wall of the connecting part 54 protrudes four stop edges 541 which are arranged at intervals along the circumference of the connecting part 54. Adjacent two stop edges 541 are connected and form a flow guide groove 53 through which the oil flows. The flow guide groove 53 is an arc-shaped groove. The inflow hole 211 is arranged opposite to the oil passing hole 411, and the pushing part 51 and the blocking part 52 are coaxially arranged.

[0032] As shown in Figure 6 , the auxiliary piston 3 of the application is connected with the brake pedal 8 through the existing pedal link assembly 10. When the brake pedal 8 is not stepped on, as shown in Figure 1As shown by the dotted line, the oil passage 31 and the oil return passage 21 are separated by the first single-component assembly 4, the inflow hole 211 of the oil return passage 21 is in an unblocked state, and the oil inlet hole 15 and the working oil hole 16 are in a communication state. In this state, the auxiliary piston 3 and the main piston 2 are both in the initial position, and the moving stroke 14 between the two is sufficient for the auxiliary piston 3 to move towards the main piston 2.

[0033] When the driver steps on the brake pedal 8, the auxiliary piston 3 is pushed to move by the pedal linkage assembly 10, so that the auxiliary piston 3 drives the first single-component assembly 4 and the valve core 5 to move synchronously towards the main piston 2. When the valve core 5 abuts against the main piston 2, it no longer moves, and the blocking part 52 blocks the inflow hole 211 of the oil return passage 21, while the auxiliary piston 3 continues to move towards the main piston 2 under the driving of the pedal linkage assembly 10, so that the first single-component assembly 4 moves relative to the valve core 5, and then the valve core 5 passively pushes the ball core 42 against the elastic force of the pressure spring 43, and the first single-component assembly 4 is opened, as shown by the solid line. Figure 3 As shown by the dotted line, oil continuously flows into the lower end of the main piston 2, that is, oil continuously enters the oil return cavity 112 through the oil passage 31 but cannot flow out due to the blocking of the oil return passage 21, so that the oil return cavity 112 is pressurized, and then the oil pressure acts on the end face of the main piston 2 to push the main piston 2 to move upwards. The main piston 2 drives the balance piston 9 to move upwards against the elastic force of the return spring. During the process that the main piston 2 drives the balance piston 9 to move upwards, the sealing assembly 101 abuts against the main piston to block the communication between the oil inlet hole 15 and the oil supply cavity 131, and then the second sealing ring 104 abuts against the outer circumferential wall of the balance piston 9, so that a sealing cavity, i.e., the oil supply cavity 131, is formed between the sealing assembly 101 and the second sealing ring 104 in the valve body 1. With the continuous upward movement of the main piston 2 driving the balance piston 9, the volume of the oil supply cavity 131 continuously decreases, and the oil pressure in the oil supply cavity 131 continuously rises. When the oil pressure in the oil supply cavity 131 is higher than the oil pressure in the working cavity 132, the second single-component assembly 102 is opened, so that the oil supply cavity 131 is communicated with the balance oil passage 91, and the oil in the oil supply cavity 131 enters the working cavity 132 through the balance oil passage 91. The oil in the working cavity 132 continuously passes through the working oil hole 16 to the brake, so as to realize the braking of the brake.

[0034] When the brake reaches the required braking effect, the driver releases the brake pedal 8, the pedal link assembly 10 drives the auxiliary piston 3 back, the valve core 5 moves back with the auxiliary piston 3, the valve core 5 is separated from the main piston 2, the back oil flow channel 21 is unblocked, the oil acting on the lower end of the main piston 2 flows out from the back oil hole 13 through the back oil flow channel 21, pressure relief is realized, the load on the lower end of the main piston 2 is removed, the movement of the main piston 2 is stopped, the auxiliary piston 3 is also stopped, at the same time, the second single-component assembly 102 is closed, the pressure in the working chamber 132 reaches the opening condition set by the third single-component assembly 103, the pressure in the working chamber 132 drives the movable rod 106 to open the third single-component assembly 103, the opening of the third single-component assembly 103 makes the oil in the working chamber 132 flow out from the oil inlet hole 15 through the pressure relief oil channel 92, the oil pressure in the oil supply chamber 131 is continuously reduced, and then the balance piston 9 moves back under the elastic force of the return spring 105, in the process of moving back, the balance piston 9 is separated from the second sealing ring 104 to make the oil supply chamber 131 communicate with the working chamber 132, the oil supply chamber 131 communicates with the oil inlet hole 15, and the balance piston 9 drives the main piston 2 to move back, until the balance piston 9 returns to the initial position, and the valve body returns to the initial state.

[0035] The specific embodiments described herein merely exemplify the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, without departing from the spirit of the present application or exceeding the scope defined by the appended claims.

[0036] Although the terms valve body 1, inner cavity 11, control cavity 111, back oil cavity 112, control oil hole 12, back oil hole 13, oil supply chamber 131, working chamber 132, moving stroke 14, oil inlet hole 15, working oil hole 16, main piston 2, back oil flow channel 21, inflow hole 211, outflow hole 212, auxiliary piston 3, oil flow channel 31, oil inlet chamber 311, oil outlet chamber 312, necked section 313, flared section 314, flared surface 315, first single-component assembly 4, valve seat 41, oil passing hole 411, limiting surface 412, groove 413, ball core 42, pressure spring 43, valve core 5, pushing part 51, blocking part 52, flow guide groove 53, connecting part 54, blocking edge 541, floating gap 55, limiting part 6, floating spring 7, brake pedal 8, balance piston 9, balance oil channel 91, pressure relief oil channel 92, pedal link assembly 10, sealing assembly 101, second single-component assembly 102, third single-component assembly 103, second sealing ring 104, return spring 105, movable rod 106, etc. are used more frequently in the present application, but the possibility of using other terms is not excluded. The use of these terms is only for the convenience of describing and explaining the essence of the present application; any interpretation of them as additional limitations is contrary to the spirit of the present application.

Claims

1. A floating structure for a brake valve, comprising a valve body (1), wherein a main piston (2) and an auxiliary piston (3) movable toward the main piston (2) are disposed in the inner cavity (11) of the valve body (1), characterized in that, The main piston (2) has a return oil channel (21) for returning oil, and the auxiliary piston (3) has an oil passage (31) connecting the inner cavity (11) of the valve body (1) and the return oil channel (21). The oil passage (31) is provided with a first single component (4). The floating structure also includes a valve core (5) disposed between the main piston (2) and the auxiliary piston (3). The valve core (5) is provided with a floating spring (7) that abuts against the auxiliary piston (3). The auxiliary piston (3) can drive the valve core (5) to move so that the valve core (5) abuts against the main piston (2) to block the return oil channel (21), and the first single component (4) is opened through the valve core (5). A single component (4); the valve core (5) is elongated and passes through the oil passage (31). The valve core (5) is located between the first single component (4) and the main piston (2). The auxiliary piston (3) is provided with a limiting member (6) to restrict the valve core (5) from exiting the oil passage (31). The floating spring (7) is sleeved on the valve core (5) and one end abuts against the first single component (4). The other end of the floating spring (7) abuts against the valve core (5) so that the valve core (5) abuts against the limiting member (6). There are gaps between the valve core (5) and the first single component (4) and between the valve core (5) and the main piston (2).

2. The floating structure of a brake valve according to claim 1, characterized in that, The first single component (4) has a push part (51) at one end to open the first single component (4) and a blocking part (52) at the other end to block the return oil flow channel (21). The inner cavity (11) of the valve body (1) has a moving stroke (14) for the auxiliary piston (3) to move toward the main piston (2). The moving stroke (14) is greater than the sum of the gaps between the blocking part (52) and the main piston (2) and between the push part (51) and the first single component (4).

3. The floating structure of a brake valve according to claim 2, characterized in that, The first single component (4) includes a valve seat (41) that divides the oil passage (31) into an oil inlet chamber (311) and an oil outlet chamber (312). The valve seat (41) is threaded to the inner wall of the oil passage (31). The valve seat (41) is provided with an oil passage hole (411) that connects the oil inlet chamber (311) and the oil outlet chamber (312). The oil inlet chamber (311) is provided with a ball core (42) and a pressure spring (43) that abuts against the ball core (42) to block the oil passage hole (411). The valve core (5) passes through the oil outlet chamber (312). The floating spring (7) abuts against the valve seat (41) to create a gap between the valve core (5) and the ball core (42).

4. The floating structure of a brake valve according to claim 3, characterized in that, The return oil channel (21) includes an inflow hole (211) opened on one end face of the main piston (2). The blocking part (52) is frustoconical. The diameter of the inflow hole (211) is larger than the diameter of the small end of the blocking part (52) and smaller than the diameter of the large end of the blocking part (52). The small end of the blocking part (52) is located inside the inflow hole (211).

5. The floating structure of a brake valve according to claim 3, characterized in that, The valve seat (41) has a limiting surface (412) for the floating spring (7) to abut against. A groove (413) is provided on the limiting surface (412). The oil passage hole (411) is provided at the bottom of the groove (413). The pushing part (51) is rod-shaped and passes through the groove (413). The diameter of the pushing part (51) is smaller than the diameter of the oil passage hole (411), and the length of the pushing part (51) is greater than the height of the valve seat (41).

6. The floating structure of a brake valve according to claim 4, characterized in that, The oil outlet chamber (312) has a constricted section (313) communicating with the oil inlet chamber (311) and an flared section (314) extending to the end face of the auxiliary piston (3). The inner diameter of the constricted section (313) is larger than the inner diameter of the oil inlet chamber (311) and smaller than the inner diameter of the flared section (314). The flared section (314) and the constricted section (313) are connected to form an inclined flow-expanding surface (315). The outer wall of the valve core (5) has a guide groove (53) for oil to pass through.

7. The floating structure of a brake valve according to claim 6, characterized in that, The valve core (5) has a columnar connecting part (54) with a push part (51) and a blocking part (52) respectively connected at both ends. The outer wall of the connecting part (54) has at least two symmetrically arranged retaining edges (541). The limiting member (6) is a retaining ring embedded in the flared section (314). The floating spring (7) is sleeved on the outside of the connecting part (54) and abuts against the retaining edge (541) so that the retaining edge (541) abuts against the retaining ring. There is a floating gap (55) between the retaining edge (541) and the flared section (314).

8. The floating structure of a brake valve according to claim 7, characterized in that, The number of the baffles (541) is four. The four baffles (541) are arranged at intervals along the circumference of the connecting part (54). Two adjacent baffles (541) are connected to form the above-mentioned guide groove (53). The guide groove (53) is an arc-shaped groove. The inlet hole (211) and the oil passage hole (411) are arranged opposite each other. The pushing part (51) and the blocking part (52) are arranged coaxially.

9. A floating structure for a brake valve according to any one of claims 1-8, characterized in that, The valve body (1) inner cavity (11) includes a control cavity (111) and a return oil cavity (112) arranged coaxially. The control cavity (111) has a control oil hole (12) on its cavity wall, and the return oil cavity (112) has a return oil hole (13) on its cavity wall. The inner diameter of the return oil cavity (112) is larger than the inner diameter of the control cavity (111). The auxiliary piston (3) passes through the control cavity (111), and the main piston (2) passes through the return oil cavity (112). The outflow hole (212) of the return oil channel (21) is opened on the side wall of the main piston (2).

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