All-terrain vehicle braking system

Abstract

The present application discloses an all-terrain vehicle braking system, which includes a front-wheel braking assembly, a rear-wheel braking assembly, a brake pedal, a handbrake pump, and a hydraulic pump. The hydraulic pump includes a pump body, a piston mechanism, a connecting rod mechanism, and an elastic mechanism. The pump body is provided with a handbrake oil inlet, a first oil outlet, a second oil outlet, and a liquid supplement port. The handbrake oil inlet is communicated with the handbrake pump. The first oil outlet is communicated with the pressure port of the rear-wheel braking assembly through an oil pipeline. The second oil outlet is communicated with the pressure port of the front-wheel braking assembly through an oil pipeline. The connecting rod mechanism can drive the piston to move under the action of the brake pedal, so that the oil liquid leaves the chamber through the first oil outlet and the second oil outlet. The handbrake oil inlet is used to receive the pressure generated by the handbrake pump, so that the oil liquid leaves the chamber through the first oil outlet. The hydraulic pump in this hydraulic braking system integrates the function of hydraulic distribution, making the number of components required for the hydraulic braking system to achieve hydraulic transmission less, improving the airtightness of the system, and making the braking effect more stable.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle braking, and in particular to an all-terrain vehicle braking system. Background Art

[0002] To support the high mobility of all-terrain vehicles (ATVs) and the usage requirements in complex environments, the all-terrain vehicle braking system can convert the force generated by the brake pedal or the handbrake pump into hydraulic pressure, and then transmit it to the wheel brakes through a series of mechanisms, so as to achieve the purpose of decelerating and stopping.

[0003] In the case of executing the braking mode of the vehicle through the brake pedal, it is only necessary to transmit the pressure generated by the brake fluid to the brake calipers corresponding to the four wheels respectively through a hydraulic pump, so that the brake calipers clamp the brake discs. The commonly used all-terrain vehicle braking systems for all-terrain vehicles on the market currently control the four wheels through the brake pedal and the two front wheels through the handbrake pump. Generally, a control method of linkage between a hydraulic distribution valve and a hydraulic pump is adopted. Based on this linkage control method, the functions of the brake pedal and the handbrake pump can be realized respectively, and the functions of the brake pedal and the handbrake pump do not interfere with each other. For example, a hydraulic distribution valve is arranged between the hydraulic pump and the brake caliper corresponding to the front wheel, and the pressure generated by the handbrake pump is transmitted to the brake caliper corresponding to the front wheel through the hydraulic distribution valve. Part of the pressure generated by the brake pedal acts directly on the brake calipers of the rear wheels through the hydraulic pump, and the other part acts on the brake calipers of the front wheels through the hydraulic distribution valve. However, for the all-terrain vehicle braking system that realizes hydraulic distribution through a hydraulic pump and a hydraulic distribution valve, its structure is relatively complex, and more pipelines need to be arranged, which may lead to the risk of local leakage in the all-terrain vehicle braking system, seriously affecting the braking effect of the braking system. Summary of the Invention

[0004] In order to solve the deficiencies of the prior art, the purpose of the present application is to provide an all-terrain vehicle braking system. The hydraulic pump of this system integrates the function of hydraulic distribution, so that the number of components required for the all-terrain vehicle braking system to achieve hydraulic transmission is less, the airtightness of the system is improved, and the braking effect is more stable.

[0005] To achieve the above purpose, the present application adopts the following technical solutions:

[0006] An all-terrain vehicle braking system, comprising: a front-wheel braking assembly, a rear-wheel braking assembly, a brake pedal and a handbrake pump, the handbrake pump being used to control the front-wheel braking assembly, and the brake pedal being used to control the front-wheel braking assembly and the rear-wheel braking assembly; a hydraulic pump, the hydraulic pump including a pump body, a piston mechanism, a connecting rod mechanism and an elastic mechanism, the pump body having a chamber, the piston mechanism and the elastic mechanism being arranged in the chamber, the elastic mechanism being used to drive the piston mechanism to reset, one end of the connecting rod mechanism being connected to the piston mechanism, and the other end of the connecting rod mechanism being connected to the brake pedal, the pump body being provided with a handbrake oil inlet, a first oil outlet, a second oil outlet and a liquid supplement port communicating with the chamber, the handbrake oil inlet being communicated with the handbrake pump through an oil pipe, the first oil outlet being communicated with the pressure port of the rear-wheel braking assembly through an oil pipe, the second oil outlet being communicated with the pressure port of the front-wheel braking assembly through an oil pipe, the connecting rod mechanism being capable of driving the piston to move under the action of the brake pedal, so that the oil liquid leaves the chamber through the first oil outlet and the second oil outlet, the handbrake oil inlet being used to receive the pressure generated by the handbrake pump, so that the oil liquid leaves the chamber through the first oil outlet.

[0007] Further, the hydraulic pump further includes a sealing mechanism, the sealing mechanism being installed in the chamber and fixed to the pump body, the sealing mechanism including a chamber seal, a first seal and a second seal, the chamber seal being used to cooperate with the piston mechanism to divide the chamber into a first chamber and a second chamber, the first chamber being communicated with the first oil outlet, the second chamber being communicated with the second oil outlet, the piston mechanism including a first piston and a second piston, the first piston being arranged in the first chamber, the second piston being arranged in the second chamber, the first seal and the second seal being respectively sleeved on the first piston and the second piston, the first piston and the second piston being respectively provided with a first compensation hole and a second compensation hole, the liquid supplement port being capable of being communicated with the first chamber through the first compensation hole, and the handbrake oil inlet being capable of being communicated with the second chamber through the second compensation hole.

[0008] Further, the elastic mechanism includes a first elastic member and a second elastic member, the first elastic member being arranged between the first piston and the second piston, the second elastic member being arranged between the second piston and the pump body, the deformation directions of the first elastic member and the second elastic member being the same, and the elastic coefficient of the first elastic member being smaller than the elastic coefficient of the second elastic member.

[0009] Further, the connecting rod mechanism is capable of driving the first piston to move in a set direction under the action of the brake pedal. When the first piston moves, the first compensation hole is blocked by the first seal, so that the first chamber builds pressure, and the oil liquid in the first chamber can flow through the first oil outlet through the rear-wheel braking assembly; the first elastic member acts on the second piston, so that the second piston moves in the set direction, the second compensation hole is blocked by the second seal, so that the second chamber builds pressure, and the oil liquid in the second chamber can flow through the second oil outlet through the front-wheel braking assembly.

[0010] Further, when the link mechanism drives the first piston to move, the pressure in the first chamber is the first pressure, and the pressure in the second chamber is equal to the first pressure; if the handbrake pump generates pressure after the action of the link mechanism, the handbrake inlet can build pressure in the second chamber through the gap between the second seal and the second piston, increasing the pressure in the second chamber to the second pressure, and the second pressure is greater than the first pressure.

[0011] Further, when the handbrake pump generates pressure, the handbrake inlet can receive the oil flowing in from the handbrake pump, allowing the oil to enter the second chamber through the second compensation hole to build pressure in the second chamber, enabling the oil in the second chamber to flow through the second oil outlet to the front wheel braking assembly.

[0012] Further, when the handbrake pump generates pressure, the oil in the second chamber can flow through the second oil outlet to the front wheel braking assembly; the link mechanism can drive the first piston to move in a set direction under the action of the brake pedal. If the link mechanism drives the first piston to move in the set direction after the action of the handbrake pump, the first compensation hole is blocked by the first seal, building pressure in the first chamber, and the oil in the first chamber can flow through the first oil outlet to the rear wheel braking assembly.

[0013] Further, a limiting hole is provided on the side wall of the second piston, and a limiting member fixed to the pump body is provided in the limiting hole to limit the maximum displacement of the piston mechanism; the limiting hole penetrates the second piston along the radial direction of the second piston, and the limiting hole is provided as an oval hole, and the length of the waist of the oval hole is equal to the maximum displacement distance of the piston mechanism.

[0014] Further, a first liquid storage cavity is formed around the first piston, the first liquid storage cavity is communicated with the first compensation hole, and the first liquid storage cavity includes an opening communicated with the first chamber. The opening direction of the first liquid storage cavity faces the second piston, and at least part of the first elastic member is arranged in the first liquid storage cavity;

[0015] A second liquid storage cavity is formed around the second piston, the second liquid storage cavity is communicated with the second compensation hole, and the second liquid storage cavity includes an opening communicated with the second chamber. The opening direction of the second liquid storage cavity is the same as the opening direction of the first liquid storage cavity, and at least part of the second elastic member is arranged in the second liquid storage cavity.

[0016] The all-terrain vehicle braking system provided by the present application, by setting a hydraulic pump integrated with a hydraulic distribution function, under the input change of the brake pedal and / or the handbrake pump, controls the output of different oil outlets to change through the cooperation of the piston mechanism, the elastic mechanism, and the link mechanism, so as to achieve the control of the front wheel braking assembly and the rear wheel braking assembly through different control methods. The all-terrain vehicle braking system has fewer components required for realizing hydraulic transmission, improves the airtightness of the all-terrain vehicle braking system, and has a more stable braking effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of an all - terrain vehicle in the embodiment of the present application;

[0018] Figure 2 Schematic diagram of the braking system of an all - terrain vehicle in the embodiment of the present application;

[0019] Figure 3 Partial cross - sectional structure schematic diagram of a hydraulic braking device in the embodiment of the present application;

[0020] Figure 4 Exploded view of the hydraulic braking device from the first perspective in the embodiment of the present application;

[0021] Figure 5 Exploded view of the hydraulic braking device from the second perspective in the embodiment of the present application;

[0022] Figure 6 Cross - sectional view of the elastic mechanism of the hydraulic braking device in the initial state in the embodiment of the present application;

[0023] Figure 7 Cross - sectional view of the elastic mechanism of the hydraulic braking device in the compressed state in the embodiment of the present application;

[0024] Figure 8 Flow chart of the hydraulic braking device implementing working condition one in the embodiment of the present application;

[0025] Figure 9 Flow chart of the hydraulic braking device implementing working condition two in the embodiment of the present application;

[0026] Figure 10 Flow chart of the hydraulic braking device implementing working condition three in the embodiment of the present application;

[0027] Figure 11 Flow chart of the hydraulic braking device implementing working condition four in the embodiment of the present application. Specific embodiments

[0028] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the specific embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application.

[0029] It should be noted that the directional nouns such as up, down, left, right, front, and back, or ordinal numbers such as first and second mentioned in this article are introduced for the convenience of description based on the accompanying drawings of the specification, and do not mean any limitation on the order of components. In addition, since the functions of certain parts among the components provided in the above embodiments are the same, the present specification uses a unified naming method for these parts. The above has introduced in detail the pipe fitting connection device provided by the related technical solution, and specific embodiments have been described in this article. The description of the above embodiments is only used to help understand the method and its core idea of the present invention, and does not impose any formal limitation on the present invention.

[0030] As Figure 1 shown, the present application provides an all-terrain vehicle 100, which includes a frame 10, a body cover 20, a suspension system 30, a running system 40, and a steering system 50. The body cover 20 covers at least part of the frame 10. The body cover 20 includes, but is not limited to, an engine hood, a luggage compartment lid, a door, a fender, a body side panel, a roof panel, etc. The suspension system 30 is connected between the frame 10 and the running system 40, and is used to transmit the force and torque between the frame 10 and the running system 40, and reduce the vibration generated by the uneven road surface during the driving of the all-terrain vehicle 100. At least part of the running system 40 is located below the frame 10 and is used to support the all-terrain vehicle 100. The running system 40 includes a front wheel 41 and a rear wheel 42. The steering system 50 is connected to the front wheel 41, and the steering system 50 includes a steering handle 51.

[0031] As Figure 2 shown, further, the all-terrain vehicle 100 further includes a hydraulic braking system 60, and the hydraulic braking system 60 is used to decelerate and stop the vehicle.

[0032] As Figure 2 and Figure 3 shown, as an implementation manner, the hydraulic braking system 60 includes a hydraulic braking device 61, a front wheel braking assembly 62, a rear wheel braking assembly 63, a handbrake pump 64, and a brake pedal 65. The front wheel braking assembly 62 is installed on the front wheel 41, the rear wheel braking assembly 63 is installed on the rear wheel 42, the handbrake pump 64 is used to control the front wheel braking assembly 62, and the brake pedal 65 is used to control both the front wheel braking assembly 62 and the rear wheel braking assembly 63. Specifically, the handbrake pump 64 is installed on the steering handle 51, and a handbrake (not shown in the figure) is provided on the steering handle 51. The handbrake pump 64 can apply pressure to the front wheel braking assembly 62 under the action of the handbrake.

[0033] As Figure 3As shown, specifically, the hydraulic braking device 61 is a hydraulic pump. The hydraulic pump includes a pump body 611, a piston mechanism 612, a connecting rod mechanism 613, and an elastic mechanism 614. The pump body 611 is formed with a chamber 6111, and the chamber 6111 provides a storage space for the hydraulic fluid, allowing the hydraulic fluid to flow inside the chamber 6111. The piston mechanism 612 is disposed in the chamber 6111 and is capable of moving in the chamber 6111. The elastic mechanism 614 is used to abut against the piston mechanism 612. After the piston mechanism 612 moves, the piston mechanism 612 can be reset under the action of the elastic mechanism 614 and adjust the internal pressure of the pump body 611. One end of the connecting rod mechanism 613 is connected to the piston mechanism 612, and the other end of the connecting rod mechanism 613 is connected to the brake pedal 65. The connecting rod mechanism 613 can drive the piston mechanism 612 to move under the action of the brake pedal 65.

[0034] Specifically, the pump body 611 is provided with a handbrake oil inlet 6112, a first oil outlet 6113, a second oil outlet 6114, and a fluid replenishing port 6115 that communicate with the chamber 6111. The handbrake oil inlet 6112 is connected to the handbrake pump 64 through an oil delivery pipe. The first oil outlet 6113 is connected to the pressure port of the rear wheel braking assembly 63 through an oil delivery pipe. The second oil outlet 6114 is connected to the pressure port of the front wheel braking assembly 62 through an oil delivery pipe. The oil delivery pipe is a pipe for transporting the hydraulic fluid. The connecting rod mechanism 613 drives the piston mechanism 612 to move under the action of the brake pedal 65, causing the hydraulic fluid to leave the chamber 6111 through the first oil outlet 6113 and the second oil outlet 6114. The handbrake oil inlet 6112 is used to receive the pressure generated by the handbrake pump 64, causing the hydraulic fluid to leave the chamber 6111 through the second oil outlet 6114.

[0035] Exemplarily, the hydraulic braking system 60 further includes an oil pot (not shown in the figure), and the oil pot is used to store the hydraulic fluid. The fluid replenishing port 6115 is connected to the oil pot. The oil pot can supplement the hydraulic fluid into the chamber 6111 through the fluid replenishing port 6115, or when the pressure in the chamber 6111 increases, the hydraulic braking device 61 can press at least part of the hydraulic fluid into the oil pot through the fluid replenishing port 6115. The pressure balance inside the hydraulic braking device 61 during operation is achieved through the oil pot connected to the fluid replenishing port 6115.

[0036] As Figure 2As shown, optionally, the hydraulic braking system 60 further includes an anti-lock mechanism 66. The anti-lock mechanism 66 is disposed between the hydraulic braking device 61 and the front-wheel braking assembly 62, and between the hydraulic braking device 61 and the rear-wheel braking assembly 63. When the vehicle brakes suddenly or brakes on a low-adhesion road surface, the anti-lock mechanism 66 can prevent the tires from locking, ensuring that the vehicle still has a certain steering ability and improving driving safety. The anti-lock mechanism 66 has two hydraulic circuit interfaces, which are respectively connected to the first oil outlet 6113 and the second oil outlet 6114, so that the anti-lock mechanism 66 can directly control the hydraulic pressure distribution of the front-wheel braking assembly 62 and the rear-wheel braking assembly 63.

[0037] In the embodiment of the present application, in the absence of a braking operation, the hydraulic braking device 61 does not receive any external force, the piston mechanism 612 is located at the initial position of the chamber 6111, and the elastic mechanism 614 is in a natural state. When the driver steps on the brake pedal 65, the brake pedal 65 transmits a force to the hydraulic braking device 61 through the link mechanism 613. The link mechanism 613 drives the piston mechanism 612 to move in the chamber 6111 under the pressure of the brake pedal 65, causing the hydraulic fluid to leave the chamber 6111 through the first oil outlet 6113 and the second oil outlet 6114. The hydraulic fluid flows through the pressure port of the rear-wheel braking assembly 63 through the first oil outlet 6113, thereby providing the required braking pressure for the rear-wheel braking assembly 63; at the same time, the hydraulic fluid flows through the pressure port of the front-wheel braking assembly 62 through the second oil outlet 6114, providing hydraulic support for the front-wheel braking assembly 62. During the handbrake operation, the handbrake pump 64 transmits pressure to the chamber 6111 through the handbrake oil inlet 6112, and the hydraulic fluid flows through the first oil outlet 6113 and through the front-wheel braking assembly 62.

[0038] Under the input changes of the brake pedal 65 and / or the handbrake, the flow and pressure distribution of the hydraulic oil are controlled through the cooperation of the piston mechanism 612, the elastic mechanism 614, and the link mechanism 613, only changing the output conditions of different oil outlets of the hydraulic braking device 61, so as to achieve the control of the front-wheel braking assembly 62 and / or the rear-wheel braking assembly 63 through different control methods. The hydraulic pump of the hydraulic braking system 60 integrates the function of hydraulic distribution, making the number of components required for the hydraulic braking system 60 to achieve hydraulic transmission less, improving the airtightness of the system, and the braking effect is more stable.

[0039] As Figures 3 to 5As shown, as an implementation, the hydraulic braking device 61 further includes a sealing mechanism 615. The sealing mechanism 615 is installed in the chamber 6111 and fixed to the pump body 611. The sealing mechanism 615 includes a chamber seal 6151, a first seal 6152, and a second seal 6153. The chamber seal 6151 is used to cooperate with the piston mechanism 612 to divide the chamber 6111 into a first chamber 6111a and a second chamber 6111b (see Figure 6 ), the first chamber 6111a communicates with the first oil outlet 6113, the second chamber 6111b communicates with the second oil outlet 6114, the piston mechanism 612 includes a first piston 6121 and a second piston 6122, the first piston 6121 is disposed in the first chamber 6111a, the second piston 6122 is disposed in the second chamber 6111b, and the first seal 6152 and the second seal 6153 are respectively sleeved on the first piston 6121 and the second piston 6122. First compensation holes 6121a and 6122a are respectively formed in the first piston 6121 and the second piston 6122. The liquid filling port 6115 can communicate with the first chamber 6111a through the first compensation hole 6121a, and the handbrake oil inlet 6112 can communicate with the second chamber 6111b through the second compensation hole 6122a.

[0040] In different braking modes, through the cooperation of the first seal 6152 and the first compensation hole 6121a, and / or the cooperation of the second seal 6153 and the second compensation hole 6122a, the flow path of the oil is controlled, and thus it is determined whether the oil can flow into the first chamber 6111a through the first compensation hole 6121a, and / or whether the oil can flow into the second chamber 6111b through the second compensation hole 6122a, thereby causing a pressure change in the first chamber 6111a or the second chamber 6111b, controlling the output of different oil outlets, and realizing the function of hydraulic distribution.

[0041] Through the above settings, the pressures of the first chamber 6111a and the second chamber 6111b can be pressurized according to the externally input pressure (the pressurization process of the hydraulic braking device 61 refers to the process in which the hydraulic braking device 61 builds the working pressure from the initial state), so that the hydraulic braking device 61 integrates the function of hydraulic distribution, and further reduces the number of components required for the hydraulic braking system 60 to achieve hydraulic transmission, improves the airtightness of the hydraulic braking system 60, and enables the hydraulic braking system 60 to achieve precise hydraulic braking control.

[0042] Such as Figure 4 and 5As shown, optionally, a limiting hole 6123 is provided on the side wall of the first piston 6121 or the second piston 6122, and a limiting member 6124 fixed to the pump body 611 is provided in the limiting hole 6123. When the piston mechanism 612 is subjected to the acting force of the connecting rod mechanism 613, the limiting member 6124 in the limiting hole 6123 will limit the maximum displacement range of the piston mechanism 612.

[0043] Exemplarily, the limiting member 6124 includes but is not limited to a pin-type limiting member, a groove-type limiting member, an elastic limiting member, a fixed stop-type limiting member, etc. For example, the limiting hole 6123 penetrates the second piston 6122 along the radial direction of the second piston 6122, and the limiting hole 6123 is set as an oval hole. The limiting member 6124 is set as a pin-type limiting member, and both ends of the pin-type limiting member are fixed on the pump body 611, playing a mechanical limiting role to ensure that the movement of the piston mechanism 612 does not exceed the predetermined stroke. Here, the predetermined stroke refers to the major axis dimension of the oval hole, that is, during the movement of the piston mechanism 612, the distance that the limiting member 6124 can move in the limiting hole 6123.

[0044] As Figure 6 and Figure 7 shown, as a realization manner, when the elastic mechanism 614 is in the initial state, the first chamber 6111a is communicated with the liquid replenishing port 6115 through the first compensation hole 6121a opened on the first piston 6121, and the second chamber 6111b is communicated with the handbrake oil inlet 6112 through the second compensation hole 6122a opened on the second piston 6122, so that the inflow / outflow of the oil can be independently carried out in the first chamber 6111a and the second chamber 6111b respectively.

[0045] When the elastic mechanism 614 is in the compressed state, the first compensation hole 6121a and the second compensation hole 6122a can be blocked by the first seal 6152 and the second seal 6153 respectively, and the first chamber 6111a and the second chamber 6111b build pressure.

[0046] Specifically, the first compensation hole 6121a is located on the side wall of the first piston 6121, the second compensation hole 6122a is located on the side wall of the second piston 6122. The function of the first compensation hole 6121a is to adjust the pressure balance between the first chamber 6111a and the liquid replenishing port 6115, and the function of the second compensation hole 6122a is to adjust the pressure balance between the second chamber 6111b and the handbrake oil inlet 6112. When the first seal 6152 blocks the first compensation hole 6121a, the first chamber 6111a starts to build pressure. When the second seal 6153 blocks the second compensation hole 6122a, the second chamber 6111b starts to build pressure.

[0047] As Figure 7As shown, as an implementation, the first piston 6121 has a first liquid storage chamber 6121b communicating with the first chamber 6111a, and the second piston 6122 has a second liquid storage chamber 6122b communicating with the second chamber 6111b. When the elastic mechanism 614 is in the initial state, the first liquid storage chamber 6121b communicates with the liquid replenishing port 6115 through a first compensation hole 6121a opened on the first piston 6121, and the second liquid storage chamber 6122b communicates with the handbrake oil inlet 6112 through a second compensation hole 6122a opened on the second piston 6122, so that the inflow / outflow of the oil can be independently carried out in the first chamber 6111a and the second chamber 6111b respectively.

[0048] Among them, the first liquid storage chamber 6121b has a first opening 6121d communicating with the first chamber 6111a. The opening direction of the first liquid storage chamber 6121b faces the second piston 6122, and at least part of the first elastic member 6141 is arranged in the first liquid storage chamber 6121b. The second liquid storage chamber 6122b has a second opening 6122d communicating with the second chamber 6111b. The opening direction of the second liquid storage chamber 6122b is the same as that of the first liquid storage chamber 6121b, and at least part of the second elastic member 6142 is arranged in the second liquid storage chamber 6122b. When the oil enters the first chamber 6111a and the second chamber 6111b from the first liquid storage chamber 6121b and the second liquid storage chamber 6122b respectively, under the condition of pressure change, the oil will flow into the first chamber 6111a and the second chamber 6111b through the first opening 6121d and the second opening 6122d respectively.

[0049] As Figure 4 , Figure 5 and Figure 7 shown, as an implementation, the elastic mechanism 614 further includes a first elastic member 6141 and a second elastic member 6142. The two ends of the first elastic member 6141 are respectively connected to the first piston 6121 and the second piston 6122, and at least part of the first elastic member 6141 is located in the first liquid storage chamber 6121b. The two ends of the second elastic member 6142 are respectively connected to the second piston 6122 and the inner wall of the pump body 611, and at least part of the second elastic member 6142 is arranged in the second liquid storage chamber 6122b. When the link mechanism 613 is subjected to an externally input force, it will transmit the force to the piston mechanism 612. In this process, the elastic mechanism 614 converts the received pressure into elastic potential energy. When the force applied by the link mechanism 613 disappears, the first elastic member 6141 and the second elastic member 6142 drive the piston mechanism 612 to reset.

[0050] Further, the elastic coefficient of the first elastic member 6141 is less than that of the second elastic member 6142. When the piston mechanism 612 is subjected to the force applied by the linkage mechanism 613, the first piston 6121 and the second piston 6122 can move synchronously. It should be noted that if the elastic coefficient of the first elastic member 6141 is greater than that of the second elastic member 6142, when the piston mechanism 612 is subjected to the force applied by the linkage mechanism 613, the second piston 6121 may move while the first piston 6122 remains stationary. In this case, the rear wheel braking assembly 63 may have a problem of insufficient braking force, affecting the braking effect of the all-terrain vehicle 100. Through the above settings, the linkage mechanism 613 can drive the first piston 6121 and the second piston 6122 to move synchronously under the action of the brake pedal 65, so that the first chamber 6111a and the second chamber 6111b build pressure synchronously, in order to achieve the purpose of the front wheel braking assembly 62 and the rear wheel braking assembly 63 working synchronously.

[0051] As Figure 7 shown, as an implementation manner, the piston mechanism 612 further includes a guide member 6125. The guide member 6125 is disposed between the first piston 6121 and the second piston 6122. The first piston 6121 has a first positioning portion 6121c extending along its axial direction. The first positioning portion 6121c is located in the first liquid storage chamber 6121b and extends towards the direction of the first opening 6121d, so that at least a part of the first positioning portion 6121c passes through the guide member 6125 and is in clearance fit with the guide member 6125. Through the clearance fit between the guide member 6125 and the first positioning portion 6121c, when the first piston 6121 moves, the first positioning portion 6121c can move within the clearance range of the guide member 6125, ensuring that the first piston 6121 only moves along its axial direction, avoiding the offset of the first piston 6121 and reducing the wear of the first piston 6121.

[0052] Optionally, the guide member 6125 is disposed between the second piston 6122 and the inner wall of the pump body 611. The second piston 6122 has a second positioning portion 6122c extending along its axial direction. The second positioning portion 6122c is located in the second liquid storage chamber 6122b and extends towards the direction of the second opening 6122d, so that at least a part of the second positioning portion 6122c passes through the guide member 6125 and is in clearance fit with the guide member 6125, thereby ensuring that the second piston 6122 can move along its axial direction and reducing the wear of the second piston 6122.

[0053] When the first piston 6121 and the second piston 6122 are both configured with the guide member 6125, the elastic coefficients of the first elastic member 6141 and the second elastic member 6142 satisfy any one of the following relationships:

[0054] The elastic coefficient of the first elastic member 6141 is greater than that of the second elastic member 6142, and the pressure difference between the first chamber 6111a and the second chamber 6111b during pressure building satisfies that the pressure difference between the two chambers is within a set pressure threshold range;

[0055] Or, the elastic coefficient of the first elastic member 6141 is less than that of the second elastic member 6142, and the pressure difference between the first chamber 6111a and the second chamber 6111b during pressure building satisfies that the pressure difference between the two chambers is within a set pressure threshold range.

[0056] Exemplarily, in the relationship satisfied by the elastic coefficients of the first elastic member 6141 and the second elastic member 6142, the set pressure threshold range is from -0.3 MPa to 0.3 MPa.

[0057] As a realization method, according to different external inputs, the hydraulic braking device 61 can, corresponding to the acting forces generated by the handbrake and the brake pedal 65, execute the following four different working conditions:

[0058] As Figure 8 shown, Working condition 1: Only the acting force generated by the brake pedal 65 acts on the hydraulic braking device 61, and the hydraulic braking device 61 executes the following steps:

[0059] Step S801: The brake pedal 65 receives an externally input pressure and transmits the pressure to the link mechanism 613;

[0060] Step S802: The link mechanism 613 drives the first piston 6121 to move in a set direction (the set direction refers to the direction from the first piston 6121 to the second piston 6122), so that the first compensation hole 6121a is blocked by the first seal 6152, and the first chamber 6111a builds pressure;

[0061] Step S803: The oil in the first chamber 6111a flows through the rear wheel braking assembly 63 through the first oil outlet 6113;

[0062] Step S804: The first elastic member 6141 acts on the second piston 6122, causing the second piston 6122 to move in the set direction, and the second compensation hole 6122a is blocked by the second seal 6153, and the second chamber 6111b builds pressure;

[0063] Step S805: The oil in the second chamber 6111b flows through the second oil outlet 6114 through the front wheel braking assembly 62.

[0064] It should be noted that since the external input is only the brake pedal 65, the pressure - building processes of the first chamber 6111a and the second chamber 6111b are carried out simultaneously, and the pressure in the second chamber 6111b is equal to the pressure in the first chamber 6111a, achieving synchronous braking of the front wheels 41 and the rear wheels 42 by the brake pedal 65.

[0065] As Figure 9 shown, operating condition two: The pressure generated by the brake pedal 65 acts on the hydraulic braking device 61 first, and the pressure generated by the handbrake pump 64 acts on the hydraulic braking device 61 later. The hydraulic braking device 61 performs the following steps:

[0066] Step S901: The brake pedal 65 receives the pressure input from the outside and transmits the pressure to the linkage mechanism 613;

[0067] Step S902: The linkage mechanism 613 drives the first piston 6121 to move, so that the first compensation hole 6121a is blocked by the first seal 6152, and the first chamber 6111a builds pressure;

[0068] Among them, when the first chamber 6111a builds pressure, the pressure in the first chamber 6111a is the first pressure.

[0069] Step S903: The oil in the first chamber 6111a flows through the first oil outlet 6113 to the rear - wheel braking assembly 63;

[0070] Step S904: The first elastic member 6141 drives the second piston 6122 to move under the action of the first piston 6121, so that the second compensation hole 6122a is blocked by the second seal 6153, and the second chamber 6111b builds pressure;

[0071] Among them, when the second chamber 6111b builds pressure, the pressure in the second chamber 6111b is equal to the first pressure.

[0072] Step S905: The oil in the second chamber 6111b flows through the second oil outlet 6114 to the front - wheel braking assembly 62;

[0073] Step S906: The handbrake pump 64 generates pressure, and the handbrake oil inlet 6112 builds pressure on the second chamber 6111b through the gap between the second seal 6153 and the second piston 6122, so that the pressure in the second chamber 6111b increases to the second pressure, and the second pressure is greater than the first pressure.

[0074] It should be noted that if the pressure in the second chamber 6111b increases to the second pressure, since the pressure in the second chamber 6111b is different from that in the first chamber 6111a, the second piston 6122 will move towards the first piston 6121 under the action of the pressure to compress the first elastic member 6141 until the pressures in the second chamber 6111b and the first chamber 6111a are equal, bringing the hydraulic braking device 61 into a state of pressure balance.

[0075] In the embodiment of the present application, the second seal 6153 has the function of one-way pressure building, enabling the hydraulic fluid in the handbrake pump 64 to enter the second chamber 6111b through the gap between the second piston 6122 and the second seal 6153, increasing the pressure in the second chamber 6111b to the second pressure.

[0076] Exemplarily, the second seal 6153 is set to any one of a C-shaped leather cup or an E-shaped leather cup.

[0077] As Figure 10 shown, in working condition three: only the pressure generated by the handbrake pump 64 acts on the hydraulic braking device 61, and the hydraulic braking device 61 performs the following steps:

[0078] Step S1001: The handbrake pump 64 receives an externally input pressure and transmits the pressure to the handbrake oil inlet 6112;

[0079] Step S1002: The handbrake oil inlet 6112 receives the hydraulic fluid flowing in from the handbrake pump 64, enabling the hydraulic fluid to enter the second chamber 6111b through the second compensation hole 6122a, and the second chamber 6111b builds pressure;

[0080] Step S1003: The hydraulic fluid in the second chamber 6111b flows through the second oil outlet 6114 to the front wheel braking assembly 62.

[0081] It should be noted that since the link mechanism 613 does not exert pressure on the piston mechanism 612 and the piston mechanism 612 is at the initial position in the chamber 6111, the second compensation hole 6122a is not blocked by the second sealing mechanism 615 at this time, enabling the hydraulic fluid to flow from the handbrake oil inlet 6112 through the second compensation hole 6122a and enter the second chamber 6111b, building pressure in the second chamber 6111b, and achieving the effect of the handbrake independently controlling the braking of the front wheels 41.

[0082] As Figure 11 shown, in working condition four: the pressure generated by the handbrake pump 64 acts on the hydraulic braking device 61 first, and then the pressure generated by the brake pedal 65 acts on the hydraulic braking device 61. The hydraulic braking device 61 performs the following steps:

[0083] Step S1101: The parking brake pump 64 receives an externally input pressure and transmits the pressure to the parking brake oil inlet 6112;

[0084] Step S1102: The parking brake oil inlet 6112 receives the oil flowing in from the parking brake pump 64, enabling the oil to enter the second chamber 6111b through the second compensation hole 6122a, and the second chamber 6111b builds pressure;

[0085] Step S1103: The oil in the second chamber 6111b flows through the second oil outlet 6114 to the front wheel brake assembly 62;

[0086] Step S1104: The brake pedal 65 receives an externally input pressure and transmits the pressure to the linkage mechanism 613;

[0087] Step S1105: The linkage mechanism 613 drives the first piston 6121 to move, causing the first compensation hole 6121a to be blocked by the first seal 6152, and the first chamber 6111a builds pressure;

[0088] Step S1106: The oil in the first chamber 6111a flows through the first oil outlet 6113 to the rear wheel brake assembly 63.

[0089] Among them, since the linkage mechanism 613 drives the first piston 6121 to move, the first elastic member 6141 connected to the first piston 6121 will drive the second piston 6122 to move to compress the space of the second chamber 6111b. If the pressure generated by the second chamber 6111b building pressure under the action of the parking brake pump 64 is P1, and the pressure generated by the first chamber 6111a building pressure under the action of the linkage mechanism 613 is P2, then the pressure generated after the second chamber 6111b is compressed is P3 (P3 = P1 + P2). Since the pressure P3 of the second chamber 6111b is greater than the pressure P2 of the first chamber 6111a at this time, the second piston 6122 moves in the direction close to the first piston 6121 to compress the first elastic member 6141 until the pressures of the second chamber 6111b and the first chamber 6111a are equal, enabling the hydraulic braking device 61 to reach a state of pressure balance.

[0090] In summary, in the embodiment of the present application, the hydraulic braking device 61 integrates the function of hydraulic distribution, enabling the hydraulic braking system 60 to have fewer components required for hydraulic transmission, improving the airtightness of the system, and having a more stable braking effect.

[0091] It should be understood that for those of ordinary skill in the art, improvements or transformations can be made according to the above description, and all such improvements and transformations should fall within the protection scope of the appended claims of the present application.

Claims

1. An all-terrain vehicle braking system, comprising: A front wheel braking assembly, a rear wheel braking assembly, a brake pedal and a handbrake pump, the handbrake pump being used to control the front wheel braking assembly, and the brake pedal being used to control the front wheel braking assembly and the rear wheel braking assembly; Characterized in that, The all-terrain vehicle braking system further includes a hydraulic pump, the hydraulic pump including a pump body, a piston mechanism, a connecting rod mechanism, an elastic mechanism and a sealing mechanism. The pump body has a chamber, and the piston mechanism, the elastic mechanism and the sealing mechanism are all arranged in the chamber. The sealing mechanism is fixed to the pump body. The elastic mechanism is used to drive the piston mechanism to reset. One end of the connecting rod mechanism is connected to the piston mechanism, and the other end of the connecting rod mechanism is connected to the brake pedal. The pump body is provided with a handbrake oil inlet, a first oil outlet, a second oil outlet and a liquid supplement port that communicate with the chamber. The handbrake oil inlet is communicated with the handbrake pump through an oil pipe. The first oil outlet is communicated with the pressure port of the rear wheel braking assembly through an oil pipe. The second oil outlet is communicated with the pressure port of the front wheel braking assembly through an oil pipe. The connecting rod mechanism can drive the piston mechanism to move under the action of the brake pedal, so that the oil liquid leaves the chamber through the first oil outlet and the second oil outlet. The handbrake oil inlet is used to receive the pressure generated by the handbrake pump, so that the oil liquid leaves the chamber through the first oil outlet; Wherein, the sealing mechanism includes a chamber seal, and the chamber seal cooperates with the piston mechanism to divide the chamber into a first chamber communicated with the first oil outlet and a second chamber communicated with the second oil outlet. The piston mechanism includes a first piston and a second piston respectively arranged in the first chamber and the second chamber. The first piston and the second piston are respectively provided with a first compensation hole and a second compensation hole. The liquid supplement port can communicate with the first chamber through the first compensation hole, and the handbrake oil inlet can communicate with the second chamber through the second compensation hole.

2. The all-terrain vehicle braking system according to claim 1, characterized in that, The sealing mechanism further includes a first seal and a second seal, and the first seal and the second seal are respectively sleeved on the first piston and the second piston.

3. The all-terrain vehicle braking system according to claim 2, characterized in that, When the elastic mechanism is in an initial state, the liquid supplement port communicates with the first chamber through the first compensation hole, and the handbrake oil inlet communicates with the second chamber through the second compensation hole; when the elastic mechanism is in a compressed state, the first compensation hole and the second compensation hole can be blocked by the first seal and the second seal respectively, and the first chamber and the second chamber build pressure.

4. The all-terrain vehicle braking system according to claim 3, characterized in that, The elastic mechanism includes a first elastic member and a second elastic member. The first elastic member is disposed between the first piston and the second piston, and the second elastic member is disposed between the second piston and the pump body. The deformation directions of the first elastic member and the second elastic member are the same, and the elastic coefficient of the first elastic member is less than that of the second elastic member.

5. The all-terrain vehicle braking system according to claim 4, wherein the link mechanism can drive the first piston to move in a set direction under the action of the brake pedal. When the first piston moves, the first compensation hole is blocked by the first seal, so that the first chamber builds pressure, and the hydraulic fluid in the first chamber can flow through the first oil outlet to the rear wheel braking assembly; the first elastic member acts on the second piston to drive the second piston to move in the set direction, and the second compensation hole is blocked by the second seal, so that the second chamber builds pressure, and the hydraulic fluid in the second chamber can flow through the second oil outlet to the front wheel braking assembly.

6. The all-terrain vehicle braking system according to claim 5, wherein when the link mechanism drives the first piston to move, the pressure in the first chamber is the first pressure, and the pressure in the second chamber is equal to the first pressure; if the handbrake pump generates pressure after the action of the link mechanism, the handbrake inlet can build pressure in the second chamber through the gap between the second seal and the second piston, so that the pressure in the second chamber increases to the second pressure, and the second pressure is greater than the first pressure.

7. The all-terrain vehicle braking system according to claim 4, wherein when the handbrake pump generates pressure, the handbrake inlet can receive the hydraulic fluid flowing in from the handbrake pump, so that the hydraulic fluid enters the second chamber through the second compensation hole to build pressure in the second chamber, and the hydraulic fluid in the second chamber can flow through the second oil outlet to the front wheel braking assembly.

8. The all-terrain vehicle braking system according to claim 7, wherein when the handbrake pump generates pressure, the hydraulic fluid in the second chamber can flow through the second oil outlet to the front wheel braking assembly; the link mechanism can drive the first piston to move in a set direction under the action of the brake pedal. If the link mechanism drives the first piston to move in the set direction after the action of the handbrake pump, the first compensation hole is blocked by the first seal, so that the first chamber builds pressure, and the hydraulic fluid in the first chamber can flow through the first oil outlet to the rear wheel braking assembly.

9. The all-terrain vehicle braking system according to claim 4, wherein a first liquid storage chamber is formed around the first piston. The first liquid storage chamber is communicated with the first compensation hole, and the first liquid storage chamber includes an opening communicated with the first chamber. The opening direction of the first liquid storage chamber faces the second piston, and at least a part of the first elastic member is disposed in the first liquid storage chamber; A second liquid storage cavity is formed around the second piston. The second liquid storage cavity communicates with the second compensation hole, and the second liquid storage cavity includes an opening communicating with the second chamber. The opening direction of the second liquid storage cavity is the same as that of the first liquid storage cavity, and at least part of the second elastic member is disposed in the second liquid storage cavity.

10. The all-terrain vehicle braking system according to claim 1, wherein a limiting hole is provided on the side wall of the second piston, and a limiting member fixed to the pump body is provided in the limiting hole to limit the maximum displacement of the piston mechanism; the limiting hole penetrates the second piston along the radial direction of the second piston, the limiting hole is provided as a kidney-shaped hole, and the waist length of the kidney-shaped hole is equal to the maximum displacement distance of the piston mechanism.

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