All-terrain vehicle and hydraulic braking device thereof

Abstract

The invention discloses a hydraulic braking device and an all-terrain vehicle using the hydraulic braking device. The hydraulic braking device comprises a pump body, a piston mechanism, a sealing mechanism, a connecting rod mechanism and an elastic mechanism. The pump body is provided with a hand brake oil inlet, a first oil outlet, a second oil outlet and a liquid supplementing opening, the hand brake oil inlet is communicated with the hand brake pump, the first oil outlet is communicated with the rear wheel brake assembly, and the second oil outlet is communicated with the front wheel brake assembly; the sealing mechanism comprises a cavity sealing piece, a first sealing piece and a second sealing piece, the cavity sealing piece divides the cavity into a first cavity and a second cavity, the piston mechanism comprises a first piston and a second piston, a first compensation hole is formed in the first piston, and a second compensation hole is formed in the second piston. By means of the arrangement, the hydraulic braking device integrates the hydraulic distribution function, the number of the hydraulic braking device and related accessories is reduced, and the better air tightness and braking effect are achieved.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to an all-terrain vehicle and a hydraulic brake device thereof. Background Art

[0002] All-Terrain Vehicle (ATV) is a vehicle designed for driving on unpaved roads and is suitable for various complex terrain conditions. For all-terrain vehicles controlled by steering wheels, in order to support the high mobility of the vehicle and the use requirements in complex environments, a hydraulic braking system is configured, which can convert the pedal force pressed by the driver into hydraulic pressure, and then transmit it to the brakes of each wheel through a series of mechanisms, thereby achieving the purpose of deceleration and stopping.

[0003] At present, the commonly used hydraulic brake system for all-terrain vehicles on the market is to realize the foot brake to control the four wheels and the hand brake to control the two front wheels. The control method of the hydraulic distribution valve and the hydraulic pump linkage is generally adopted. Based on this linkage control method, the foot brake and hand brake functions can be realized respectively, and the foot brake and hand brake functions do not interfere with each other. For example, a hydraulic distribution valve is configured between the hydraulic pump and the caliper corresponding to the front wheel, and the pressure generated by the hand brake pump is transmitted to the caliper corresponding to the front wheel through the hydraulic distribution valve. Part of the pressure generated by the foot brake acts directly on the caliper of the rear wheel through the hydraulic pump, and the other part acts on the caliper of the front wheel through the hydraulic distribution valve. However, for the hydraulic brake system that realizes hydraulic distribution through the hydraulic pump and the distribution valve, its structure is relatively complex and requires the layout of more pipelines, which may cause the risk of local leakage in the hydraulic brake system, seriously affecting the braking effect of the brake system. Summary of the invention

[0004] In order to address the deficiencies of the prior art, the purpose of the present application is to provide an all-terrain vehicle and a hydraulic brake device thereof, so that the hydraulic brake device integrates the function of hydraulic distribution, reduces the number of hydraulic brake devices and related accessories, and has better air tightness and braking effect.

[0005] To achieve the above objectives, this application adopts the following technical solutions: A hydraulic brake device is applied to the hydraulic brake system of an all-terrain vehicle. The hydraulic brake system includes a front wheel brake assembly, a rear wheel brake assembly and a hand brake pump; the hydraulic brake device includes: a pump body, which is formed with a chamber; a piston mechanism, which is arranged in the chamber and can move in the chamber; a sealing mechanism, which is installed in the chamber and fixed to the pump body; a connecting rod mechanism, which is used to drive the piston mechanism; an elastic mechanism, which is used to reset the piston mechanism; the pump body is provided with a hand brake oil inlet, a first oil outlet, a second oil outlet and a fluid replenishing port which are connected to the chamber, the hand brake oil inlet is used to be connected to the hand brake pump through an oil delivery pipe, and the first oil outlet is used to be connected to the rear wheel brake assembly through an oil delivery pipe The oil pipe is connected, and the second oil outlet is used to be connected with the front wheel brake assembly through the oil pipe; the sealing mechanism includes a chamber seal, a first seal and a second seal, the chamber seal cooperates with the piston mechanism to separate the chamber into a first chamber connected with the first oil outlet and a second chamber connected with the second oil outlet, the piston mechanism includes a first piston arranged in the first chamber and a second piston arranged in the second chamber, the first seal and the second seal are respectively sleeved on the first piston and the second piston, a first compensation hole is opened on the first piston, and a second compensation hole is opened on the second piston, the liquid replenishing port can be connected with the first chamber through the first compensation hole, and the handbrake oil inlet can be connected with the second chamber through the second compensation hole.

[0006] Furthermore, when the elastic mechanism is in an initial state, the fluid filling port is connected to the first chamber through the first compensation hole, and the handbrake oil inlet is connected to 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 pressure is built up in the first chamber and the second chamber.

[0007] Furthermore, the elastic mechanism includes a first elastic member and a second elastic member, the first elastic member is arranged between the first piston and the second piston, the second elastic member is arranged 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 smaller than the elastic coefficient of the second elastic member.

[0008] Furthermore, the hydraulic braking system includes a brake pedal, which is connected to a connecting rod mechanism. The connecting rod 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 is pressurized, and the oil in the first chamber can flow through the rear wheel brake assembly through the first oil outlet; the first elastic member acts on the second piston, so that the second piston moves in the set direction, and the second compensation hole is blocked by the second seal, so that the second chamber is pressurized, and the oil in the second chamber can flow through the front wheel brake assembly through the second oil outlet.

[0009] Furthermore, when the connecting rod 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 connecting rod mechanism acts, the handbrake oil inlet can build up 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.

[0010] Furthermore, when the handbrake pump generates pressure, the handbrake oil 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 up pressure in the second chamber, so that the oil in the second chamber can flow through the front wheel brake assembly through the second oil outlet.

[0011] Furthermore, when the handbrake pump generates pressure, the oil in the second chamber can flow through the front wheel brake assembly through the second oil outlet; the hydraulic brake system includes a brake pedal, which is connected to a connecting rod mechanism, and the connecting rod mechanism can drive the first piston to move in a set direction under the action of the brake pedal. If the connecting rod mechanism drives the first piston to move in the set direction after the handbrake pump is applied, the first compensation hole is blocked by the first seal, so that the first chamber builds up pressure, and the oil in the first chamber can flow through the rear wheel brake assembly through the first oil outlet.

[0012] Furthermore, a limiting hole is provided on the side wall of the first piston or 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.

[0013] Furthermore, the limiting hole penetrates the second piston in the radial direction of the second piston, and the limiting hole is configured as a waist-shaped hole, and the waist length of the waist-shaped 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 is toward the second piston, and at least a part of the first elastic member is arranged in the first liquid storage cavity; A second liquid storage chamber is formed around the second piston, the second liquid storage chamber is connected to the second compensation hole, and the second liquid storage chamber includes an opening connected to the second chamber. The opening direction of the second liquid storage chamber is the same as the opening direction of the first liquid storage chamber, and at least a portion of the second elastic member is arranged in the second liquid storage chamber.

[0015] Further, the piston mechanism includes a guide member, the guide member is arranged between the first piston and the second piston, the first piston includes a first positioning portion extending along its axial direction, the first positioning portion is located in the first liquid storage cavity, at least part of the first positioning portion is penetrated in the guide member, and is in clearance fit with the guide member; And / or the guide member is arranged between the second piston and the pump body, the second piston includes a second positioning portion extending along its axial direction, the second positioning portion is in the second liquid storage chamber, at least part of the second positioning portion is passed through the guide member and is gap-matched with the guide member.

[0016] In a second aspect, the present application further provides an all-terrain vehicle, comprising a frame; a suspension system, the suspension system being connected to the frame; a traveling system, the traveling system being connected to the suspension system, the traveling system comprising a front wheel and a rear wheel; a steering system, the steering system being connected to the front wheel, the steering system comprising a steering handle; a hydraulic brake system, the hydraulic brake system comprising a front wheel brake assembly, a rear wheel brake assembly and a hand brake pump, the front wheel brake assembly being mounted on the front wheel, the rear wheel brake assembly being mounted on the rear wheel, and the hand brake pump being mounted on the steering handle; Furthermore, the hydraulic brake system also includes an anti-lock mechanism connecting the front wheel brake assembly and the rear wheel brake assembly, and the anti-lock mechanism includes two hydraulic circuit interfaces, and the two hydraulic circuit interfaces are respectively connected to the first oil outlet and the second oil outlet.

[0017] The hydraulic brake device provided by the present application integrates a hydraulic distribution function. When the input of the brake pedal and / or the handbrake pump changes, the output of different oil outlets is controlled by the cooperation of the piston mechanism, the elastic mechanism, and the connecting rod mechanism, so as to control the front wheel brake assembly and the rear wheel brake assembly through different control methods. The number of components required for the hydraulic brake system to achieve hydraulic transmission is reduced, the air tightness of the hydraulic brake system is improved, and the braking effect is more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of an all-terrain vehicle in an embodiment of the present application; Figure 2 A schematic diagram of a hydraulic brake system in an embodiment of the present application; Figure 3 This is a schematic diagram of a partial cross-sectional structure of a hydraulic brake device in an embodiment of the present application; Figure 4 An exploded view of the hydraulic brake device in the embodiment of the present application from a first perspective; Figure 5 An exploded view of the hydraulic brake device from a second perspective in an embodiment of the present application; Figure 6 This is a cross-sectional view of the elastic mechanism of the hydraulic brake device in the implementation mode of the present application in an initial state; Figure 7 This is a cross-sectional view of the elastic mechanism of the hydraulic brake device in the embodiment of the present application in a compressed state; Figure 8 This is a flow chart of the hydraulic brake device executing working condition 1 in the implementation manner of the present application; Fig. 9This is a flow chart of the hydraulic brake device executing working condition 2 in the implementation manner of the present application; Fig.10 This is a flow chart of the hydraulic brake device executing working condition three in the implementation manner of the present application; Fig.11 This is a flow chart of the hydraulic brake device executing working condition four in the implementation manner of the present application. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the specific implementation manner of the present application will be clearly and completely described below in conjunction with the drawings in the implementation manner of the present application.

[0020] It should be noted that the directional nouns such as up, down, left, right, front, back, etc. or ordinal numbers such as "first, second" mentioned in this article are based on the drawings in the specification as a reference and are introduced for the convenience of description. They do not mean any limitation on the order of the parts. In addition, since the functions of some parts between the components provided in the above embodiments are the same, this specification adopts a unified naming method for these parts. The above is a detailed introduction to the pipe fitting connection device provided by the relevant technical solution. The specific embodiments are used in this article for explanation. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention, and does not impose any form of limitation on the present invention.

[0021] like Figure 1 As shown, the present application provides an all-terrain vehicle 100, including a frame 10, a body cover 20, a suspension system 30, a travel system 40 and a steering system 50. The body cover 20 covers at least part of the frame 10, and the body cover 20 includes but is not limited to an engine hood, a trunk lid, a door, a fender, a body side, a roof, etc. The suspension system 30 is connected between the frame 10 and the travel system 40, and is used to transmit the force and torque between the frame 10 and the travel system 40, and reduce the vibration of the all-terrain vehicle 100 caused by uneven road surface during driving. At least part of the travel system 40 is located below the frame 10, and is used to support the all-terrain vehicle 100. The travel system 40 includes a front wheel 41 and a rear wheel 42, and the steering system 50 is connected to the front wheel 41, and the steering system 50 includes a steering handle 51.

[0022] like Figure 2 As shown, the all-terrain vehicle 100 further includes a hydraulic brake system 60, and the hydraulic brake system 60 is used to achieve vehicle deceleration and parking.

[0023] like Figure 2 and Figure 3As shown, as an implementation, the hydraulic brake system 60 includes a hydraulic brake device 61, a front wheel brake assembly 62, a rear wheel brake assembly 63, a hand brake pump 64 and a brake pedal 65. The front wheel brake assembly 62 is installed on the front wheel 41, and the rear wheel brake assembly 63 is installed on the rear wheel 42. The hand brake pump 64 is used to control the front wheel brake assembly 62, and the brake pedal 65 is used to simultaneously control the front wheel brake assembly 62 and the rear wheel brake assembly 63. Specifically, the hand brake pump 64 is installed on the steering handle 51, and the steering handle 51 is provided with a hand brake (not shown in the figure). The hand brake pump 64 can apply pressure to the front wheel brake assembly 62 under the action of the hand brake.

[0024] like Figure 3 As shown, specifically, the hydraulic brake 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 containing space for oil, allowing the oil to flow inside the chamber 6111. The piston mechanism 612 is arranged in the chamber 6111 and can move in the chamber 6111. The elastic mechanism 614 is used to abut the piston mechanism 612. When 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.

[0025] 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 which are connected to 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 brake assembly 63 through an oil delivery pipe, and the second oil outlet 6114 is connected to the pressure port of the front wheel brake assembly 62 through an oil delivery pipe, which is a pipeline for transporting oil. The connecting rod mechanism 613 drives the piston mechanism 612 to move under the action of the brake pedal 65, so that the oil leaves 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, so that the oil leaves the chamber 6111 through the second oil outlet 6114.

[0026] Exemplarily, the hydraulic brake system 60 further includes an oil pot (not shown), which is used to store oil. The refill port 6115 is connected to the oil pot, and the oil pot can replenish oil into the chamber 6111 through the refill port 6115, or when the pressure in the chamber 6111 increases, the hydraulic brake device 61 can pressurize at least part of the oil into the oil pot through the refill port 6115. The oil pot connected to the refill port 6115 achieves internal pressure balance when the hydraulic brake device 61 is working.

[0027] like Figure 2 As shown, optionally, the hydraulic brake system 60 further includes an anti-lock mechanism 66, which is arranged between the hydraulic brake device 61 and the front wheel brake assembly 62, and between the hydraulic brake device 61 and the rear wheel brake 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 brake assembly 62 and the rear wheel brake assembly 63.

[0028] In the embodiment of the present application, when there is no braking operation, the hydraulic brake device 61 does not obtain 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 the force to the hydraulic brake device 61 through the connecting rod mechanism 613, and the connecting rod mechanism 613 drives the piston mechanism 612 to move in the chamber 6111 under the pressure of the brake pedal 65, so that the oil leaves the chamber 6111 through the first oil outlet 6113 and the second oil outlet 6114. The oil flows through the pressure port of the rear wheel brake assembly 63 through the first oil outlet 6113, thereby providing the required braking pressure for the rear wheel brake assembly 63; at the same time, the oil flows through the pressure port of the front wheel brake assembly 62 through the second oil outlet 6114, providing hydraulic support for the front wheel brake assembly 62. When the handbrake is operated, the handbrake pump 64 transmits pressure to the chamber 6111 through the handbrake oil inlet 6112 , and the oil flows through the front wheel brake assembly 62 through the first oil outlet 6113 .

[0029] Under the change of input of brake pedal 65 and / or hand brake, the flow and pressure distribution of hydraulic oil are controlled by the cooperation of piston mechanism 612, elastic mechanism 614 and connecting rod mechanism 613, so that only the output conditions of different oil outlets of hydraulic brake device 61 are changed, so as to realize the control of front wheel brake assembly 62 and / or rear wheel brake assembly 63 through different control modes. The hydraulic pump of hydraulic brake system 60 integrates the function of hydraulic pressure distribution, so that the number of components required for hydraulic transmission of hydraulic brake system 60 is reduced, the air tightness of the system is improved, and the braking effect is more stable.

[0030] like Figures 3 to 5 As shown, as an implementation, the hydraulic brake device 61 further includes a sealing mechanism 615, which 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 separate the chamber 6111 into a first chamber 6111a and a second chamber 6111b (see Figure 6 ), the first chamber 6111a is connected to the first oil outlet 6113, the second chamber 6111b is connected to the second oil outlet 6114, the piston mechanism 612 includes a first piston 6121 and a second piston 6122, the first piston 6121 is arranged in the first chamber 6111a, the second piston 6122 is arranged in the second chamber 6111b, the first sealing member 6152 and the second sealing member 6153 are respectively sleeved on the first piston 6121 and the second piston 6122. The first piston 6121 and the second piston 6122 are respectively provided with a first compensation hole 6121a and a second compensation hole 6122a, the liquid replenishing port 6115 can be connected to the first chamber 6111a through the first compensation hole 6121a, and the hand brake oil inlet 6112 can be connected to the second chamber 6111b through the second compensation hole 6122a.

[0031] In different braking modes, the flow path of the oil is controlled by the cooperation between the first seal 6152 and the first compensation hole 6121a, and / or the cooperation between the second seal 6153 and the second compensation hole 6122a, thereby determining 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 the pressure in the first chamber 6111a or the second chamber 6111b to change, controlling the output of different oil outlets, and realizing the function of hydraulic distribution.

[0032] Through the above-mentioned arrangement, the pressure of the first chamber 6111a and the second chamber 6111b can be built up according to the pressure of the external input (the pressure building process of the hydraulic brake device 61 refers to the process of the hydraulic brake device 61 building up the working pressure from the initial state), so that the hydraulic brake device 61 integrates the function of hydraulic distribution, thereby making the hydraulic brake system 60 require fewer components to achieve hydraulic transmission, thereby improving the air tightness of the hydraulic brake system 60, and enabling the hydraulic brake system 60 to achieve precise hydraulic braking control.

[0033] like Figure 4 and 5 As 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 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.

[0034] Exemplarily, the limiter 6124 includes but is not limited to a pin-type limiter, a slot-type limiter, an elastic limiter, a fixed block-type limiter, etc. For example, the limit hole 6123 penetrates the second piston 6122 in the radial direction of the second piston 6122, and the limit hole 6123 is set as a waist-shaped hole. The limiter 6124 is set as a pin-type limiter, and both ends of the pin-type limiter are fixed on the pump body 611, which plays a mechanical limit role to ensure that the movement of the piston mechanism 612 will not exceed the predetermined stroke, wherein the predetermined stroke refers to the long axis size of the waist-shaped hole, that is, the distance that the limiter 6124 can move in the limit hole 6123 during the movement of the piston mechanism 612.

[0035] like Figure 6 and Figure 7 As shown, as an implementation method, when the elastic mechanism 614 is in the initial state, the first chamber 6111a is connected to the fluid replenishing port 6115 through the first compensation hole 6121a opened on the first piston 6121, and the second chamber 6111b is connected to the handbrake oil inlet 6112 through the second compensation hole 6122a opened on the second piston 6122, so that the inflow / outflow of oil can be carried out independently in the first chamber 6111a and the second chamber 6111b.

[0036] When the elastic mechanism 614 is in a 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 are pressurized.

[0037] Specifically, the first compensation hole 6121a is located on the side wall of the first piston 6121, and 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 fluid replenishment 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, and when the second seal 6153 blocks the second compensation hole 6122a, the second chamber 6111b starts to build pressure.

[0038] like Figure 7 As shown, as an implementation method, the first piston 6121 has a first liquid storage chamber 6121b connected to the first chamber 6111a, and the second piston 6122 has a second liquid storage chamber 6122b connected to the second chamber 6111b. When the elastic mechanism 614 is in the initial state, the first liquid storage chamber 6121b is connected to the liquid replenishing port 6115 through the first compensation hole 6121a opened on the first piston 6121, and the second liquid storage chamber 6122b is connected to the handbrake oil inlet 6112 through the second compensation hole 6122a opened on the second piston 6122, so that the inflow / outflow of oil can be carried out independently in the first chamber 6111a and the second chamber 6111b.

[0039] The first liquid storage chamber 6121b has a first opening 6121d connected to the first chamber 6111a, the opening direction of the first liquid storage chamber 6121b faces the second piston 6122, and at least a portion of the first elastic member 6141 is disposed in the first liquid storage chamber 6121b. The second liquid storage chamber 6122b has a second opening 6122d connected to the second chamber 6111b, the opening direction of the second liquid storage chamber 6122b is the same as the opening direction of the first liquid storage chamber 6121b, and at least a portion of the second elastic member 6142 is disposed 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 respectively through the first opening 6121d and the second opening 6122d.

[0040] like Figure 4 , Figure 5 and Figure 7As shown, as an implementation method, the elastic mechanism 614 also 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 connecting rod mechanism 613 is subjected to an external input force, the force will be transmitted to the piston mechanism 612. In this process, the elastic mechanism 614 converts the pressure received into elastic potential energy. When the force applied by the connecting rod mechanism 613 disappears, the first elastic member 6141 and the second elastic member 6142 drive the piston mechanism 612 to reset.

[0041] Furthermore, the elastic coefficient of the first elastic member 6141 is smaller than the elastic coefficient of the second elastic member 6142, and when the piston mechanism 612 is subjected to the force applied by the connecting rod 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 the elastic coefficient of the second elastic member 6142, when the piston mechanism 612 is subjected to the force applied by the connecting rod mechanism 613, the second piston 6121 may move and the first piston 6122 may be stationary. In this case, the rear wheel brake assembly 63 may have insufficient braking force, which affects the braking effect of the all-terrain vehicle 100. Through the above-mentioned setting, the connecting rod 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 are pressurized synchronously, so as to achieve the purpose of synchronous operation of the front wheel brake assembly 62 and the rear wheel brake assembly 63.

[0042] like Figure 7 As shown, as an implementation, the piston mechanism 612 further includes a guide member 6125, which 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, which is located in the first liquid storage chamber 6121b and extends in the direction of the first opening 6121d, so that at least part of the first positioning portion 6121c is penetrated in the guide member 6125 and is in clearance fit with the guide member 6125. The guide member 6125 is in clearance fit with the first positioning portion 6121c, so that 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 moves only along its axial direction, avoiding the first piston 6121 from deflecting, and reducing the wear of the first piston 6121.

[0043] Optionally, the guide member 6125 is arranged between the second piston 6122 and the inner wall of the pump body 611, and 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 in the direction of the second opening 6122d, so that at least part of the second positioning portion 6122c is penetrated by the guide member 6125 and has a 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.

[0044] When the first piston 6121 and the second piston 6122 are both provided with the guide member 6125, the elastic coefficient of the first elastic member 6141 and the elastic coefficient of the second elastic member 6142 satisfy any one of the following relationships: The elastic coefficient of the first elastic member 6141 is greater than the elastic coefficient of the second elastic member 6142, and the pressure difference between the first chamber 6111a and the second chamber 6111b during the pressure building process is within a set pressure threshold range; Alternatively, the elastic coefficient of the first elastic member 6141 is smaller than the elastic coefficient of the second elastic member 6142 , and the pressure difference between the first chamber 6111a and the second chamber 6111b during the pressure building process is within a set pressure threshold range.

[0045] Exemplarily, in the relationship satisfied by the elastic coefficient of the first elastic member 6141 and the elastic coefficient of the second elastic member 6142 , the set pressure threshold range is −0.3 MPa to 0.3 MPa.

[0046] As an implementation method, according to different external inputs, the hydraulic brake device 61 can perform the following four different working conditions in response to the forces generated by the hand brake and the brake pedal 65: like Figure 8 As shown, working condition 1: only the force generated by the brake pedal 65 acts on the hydraulic brake device 61, and the hydraulic brake device 61 performs the following steps: Step S801: the brake pedal 65 receives external pressure and transmits the pressure to the connecting rod mechanism 613; Step S802: the connecting rod mechanism 613 drives the first piston 6121 to move along 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 sealing member 6152, and the first chamber 6111a is pressurized; Step S803: the oil in the first chamber 6111a flows through the rear wheel brake assembly 63 through the first oil outlet 6113; Step S804: the first elastic member 6141 acts on the second piston 6122 to move the second piston 6122 along a set direction, the second compensation hole 6122a is blocked by the second sealing member 6153, and the second chamber 6111b is pressurized; Step S805 : the oil in the second chamber 6111 b flows through the front wheel brake assembly 62 through the second oil outlet 6114 .

[0047] It should be noted that since the only external input is the brake pedal 65, the pressure building process of the first chamber 6111a and the second chamber 6111b is carried out simultaneously, and the pressure of the second chamber 6111b is equal to the pressure of the first chamber 6111a, thereby realizing the synchronous braking of the front wheel 41 and the rear wheel 42 by the brake pedal 65.

[0048] like Fig. 9 As shown, in working condition 2, the pressure generated by the brake pedal 65 first acts on the hydraulic brake device 61, and the pressure generated by the hand brake pump 64 then acts on the hydraulic brake device 61, and the hydraulic brake device 61 performs the following steps: Step S901: the brake pedal 65 receives external pressure and transmits the pressure to the connecting rod mechanism 613; Step S902: the connecting rod mechanism 613 drives the first piston 6121 to move, so that the first compensation hole 6121a is blocked by the first sealing member 6152, and the first chamber 6111a is pressurized; When the first chamber 6111a is pressurized, the pressure of the first chamber 6111a is the first pressure.

[0049] Step S903: the oil in the first chamber 6111a flows through the rear wheel brake assembly 63 through the first oil outlet 6113; 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 sealing member 6153, and the second chamber 6111b is pressurized; When the second chamber 6111b is pressurized, the pressure of the second chamber 6111b is equal to the first pressure.

[0050] Step S905: the oil in the second chamber 6111b flows through the front wheel brake assembly 62 through the second oil outlet 6114; 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 of the second chamber 6111b increases to a second pressure, which is greater than the first pressure.

[0051] 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 the pressure in the first chamber 6111a, the second piston 6122 will move toward the direction of the first piston 6121 under the action of pressure to compress the first elastic member 6141 until the pressure in the second chamber 6111b is equal to the pressure in the first chamber 6111a, thereby achieving a pressure balance state in the hydraulic brake device 61.

[0052] In the embodiment of the present application, the second seal 6153 has the function of unidirectional pressure building, so that the oil in the handbrake pump 64 can enter the second chamber 6111b through the gap between the second piston 6122 and the second seal 6153, thereby increasing the pressure of the second chamber 6111b to the second pressure.

[0053] Exemplarily, the second sealing member 6153 is configured as either a C-type leather cup or an E-type leather cup.

[0054] like Fig.10 As shown, working condition three: only the pressure generated by the hand brake pump 64 acts on the hydraulic brake device 61, and the hydraulic brake device 61 performs the following steps: Step S1001: the handbrake pump 64 receives external input pressure and transmits the pressure to the handbrake oil inlet 6112; Step S1002: The handbrake oil inlet 6112 receives the oil flowing in from the handbrake pump 64, so that the oil enters the second chamber 6111b through the second compensation hole 6122a, and the second chamber 6111b is pressurized; Step S1003 : the oil in the second chamber 6111 b flows through the front wheel brake assembly 62 through the second oil outlet 6114 .

[0055] It should be noted that since the connecting rod mechanism 613 does not generate pressure on the piston mechanism 612, the piston mechanism 612 is located at the initial position of the chamber 6111. At this time, the second compensation hole 6122a is not blocked by the second sealing mechanism 615, so that the oil can flow from the handbrake oil inlet 6112 through the second compensation hole 6122a and enter the second chamber 6111b, so that the second chamber 6111b builds up pressure, thereby achieving the effect of the handbrake solely controlling the braking of the front wheel 41.

[0056] like Fig.11 As shown, in working condition 4, the pressure generated by the handbrake pump 64 first acts on the hydraulic brake device 61, and the pressure generated by the brake pedal 65 then acts on the hydraulic brake device 61. The hydraulic brake device 61 performs the following steps: Step S1101: the handbrake pump 64 receives external input pressure and transmits the pressure to the handbrake oil inlet 6112; Step S1102: the handbrake oil inlet 6112 receives the oil flowing in from the handbrake pump 64, so that the oil enters the second chamber 6111b through the second compensation hole 6122a, and the second chamber 6111b is pressurized; Step S1103: the oil in the second chamber 6111b flows through the front wheel brake assembly 62 through the second oil outlet 6114; Step S1104: the brake pedal 65 receives external pressure and transmits the pressure to the connecting rod mechanism 613; Step S1105: the connecting rod mechanism 613 drives the first piston 6121 to move, so that the first compensation hole 6121a is blocked by the first sealing member 6152, and the first chamber 6111a is pressurized; Step S1106 : the oil in the first chamber 6111 a flows through the rear wheel brake assembly 63 through the first oil outlet 6113 .

[0057] Among them, since the connecting rod 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 under the action of the hand brake pump 64 is P1, and the pressure generated by the first chamber 6111a under the action of the connecting rod mechanism 613 is P2, then the pressure generated by the compression of the second chamber 6111b 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 pressure of the second chamber 6111b is equal to that of the first chamber 6111a, so that the pressure in the hydraulic brake device 61 reaches a state of pressure balance.

[0058] In summary, in the implementation manner of the present application, the hydraulic brake device 61 integrates the function of hydraulic distribution, so that the hydraulic brake system 60 requires fewer components to achieve hydraulic transmission, improves the air tightness of the system, and has a more stable braking effect.

[0059] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the claims attached to this application.

Claims

1. A hydraulic brake device, which is applied to a hydraulic brake system of an all-terrain vehicle, wherein the hydraulic brake system comprises a front wheel brake assembly, a rear wheel brake assembly and a hand brake pump; the hydraulic brake device comprises: a pump body, the pump body forming a chamber; a piston mechanism, the piston mechanism being disposed in the chamber and being movable in the chamber; A sealing mechanism, the sealing mechanism is installed in the chamber and fixed to the pump body; A connecting rod mechanism, wherein the connecting rod mechanism is used to drive the piston mechanism; an elastic mechanism, the elastic mechanism being used to reset the piston mechanism; The invention is characterized in that the pump body is provided with a handbrake oil inlet, a first oil outlet, a second oil outlet and a fluid replenishing port which are connected with the chamber, the handbrake oil inlet is used to be connected with the handbrake pump through an oil pipe, the first oil outlet is connected with the rear wheel brake assembly through an oil pipe, and the second oil outlet is connected with the front wheel brake assembly through an oil pipe; the sealing mechanism comprises a chamber seal, a first seal and a second seal, the chamber seal cooperates with the piston mechanism to separate the chamber into a first chamber connected with the first oil outlet and a second chamber connected with the second oil outlet, the piston mechanism comprises a first piston arranged in the first chamber and a second piston arranged in the second chamber, the first seal and the second seal are respectively sleeved on the first piston and the second piston, a first compensation hole is provided on the first piston, a second compensation hole is provided on the second piston, the fluid replenishing port can be connected with the first chamber through the first compensation hole, and the handbrake oil inlet can be connected with the second chamber through the second compensation hole.

2. The hydraulic brake device according to claim 1, characterized in that: When the elastic mechanism is in an initial state, the fluid filling port is connected to the first chamber through the first compensation hole, and the handbrake oil inlet is connected to 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 are pressurized.

3. The hydraulic brake device according to claim 2, characterized in that: The elastic mechanism includes a first elastic member and a second elastic member, the first elastic member is arranged between the first piston and the second piston, the second elastic member is arranged between the second piston and the pump body, the first elastic member and the second elastic member have the same deformation direction, and the elastic coefficient of the first elastic member is smaller than the elastic coefficient of the second elastic member.

4. The hydraulic brake device according to claim 3, characterized in that: The hydraulic brake system includes a brake pedal, which is connected to the connecting rod mechanism. The connecting rod 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 is pressurized, and the oil in the first chamber can flow through the rear wheel brake assembly through the first oil outlet; the first elastic member acts on the second piston, so that the second piston moves in the set direction, and the second compensation hole is blocked by the second seal, so that the second chamber is pressurized, and the oil in the second chamber can flow through the front wheel brake assembly through the second oil outlet.

5. The hydraulic brake device according to claim 4, characterized in that: When the connecting rod mechanism drives the first piston to move, the pressure in the first chamber is a first pressure, and the pressure in the second chamber is equal to the first pressure; if the handbrake pump generates pressure after the connecting rod mechanism acts, the handbrake oil inlet can build up 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 a second pressure, and the second pressure is greater than the first pressure.

6. The hydraulic brake device according to claim 3, characterized in that: When the handbrake pump generates pressure, the handbrake oil 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 up pressure in the second chamber, so that the oil in the second chamber can flow through the front wheel brake assembly through the second oil outlet.

7. The hydraulic brake device according to claim 6, characterized in that: When the handbrake pump generates pressure, the oil in the second chamber can flow through the front wheel brake assembly through the second oil outlet; the hydraulic brake system includes a brake pedal, which is connected to the connecting rod mechanism, and the connecting rod mechanism can drive the first piston to move in a set direction under the action of the brake pedal. If the connecting rod mechanism drives the first piston to move in the set direction after the handbrake pump is acted on, the first compensation hole is blocked by the first seal, so that the first chamber builds up pressure, and the oil in the first chamber can flow through the rear wheel brake assembly through the first oil outlet.

8. The hydraulic brake device according to claim 3, characterized in that: 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 a part of the first elastic member is disposed in the first liquid storage cavity; A second liquid storage chamber is formed around the second piston, the second liquid storage chamber is connected to the second compensation hole, and the second liquid storage chamber includes an opening connected to the second chamber, the opening direction of the second liquid storage chamber is the same as the opening direction of the first liquid storage chamber, and at least a portion of the second elastic member is arranged in the second liquid storage chamber.

9. The hydraulic brake device according to claim 8, characterized in that: The piston mechanism includes a guide member, the guide member is arranged between the first piston and the second piston, the first piston includes a first positioning portion extending along its axial direction, the first positioning portion is located in the first liquid storage cavity, at least part of the first positioning portion passes through the guide member and is in clearance fit with the guide member; And / or the guide member is arranged between the second piston and the pump body, the second piston includes a second positioning portion extending along its axial direction, the second positioning portion is located in the second liquid storage chamber, at least part of the second positioning portion passes through the guide member and is gap-matched with the guide member.

10. The hydraulic brake device according to claim 1, characterized in that: A limiting hole is arranged on the side wall of the first piston or the second piston, and a limiting member fixed to the pump body is arranged in the limiting hole to limit the maximum displacement of the piston mechanism.

11. The hydraulic brake device according to claim 10, characterized in that: The limiting hole penetrates the second piston in a radial direction of the second piston. The limiting hole is configured as a waist-shaped hole, and the waist length of the waist-shaped hole is equal to the maximum displacement distance of the piston mechanism.

12. An all-terrain vehicle comprising: Frame; a suspension system connected to the vehicle frame; A walking system, the walking system is connected to the suspension system, and the walking system includes front wheels and rear wheels; A steering system, the steering system is connected to the front wheel, and the steering system includes a steering handle; A hydraulic brake system, the hydraulic brake system comprising a front wheel brake assembly, a rear wheel brake assembly and a hand brake pump, the front wheel brake assembly is mounted on the front wheel, the rear wheel brake assembly is mounted on the rear wheel, and the hand brake pump is mounted on the steering handle; It is characterized in that the hydraulic braking system also includes a hydraulic braking device as described in any one of claims 1-11.

13. The all-terrain vehicle according to claim 12, characterized in that: The hydraulic brake system also includes an anti-lock mechanism connecting the front wheel brake assembly and the rear wheel brake assembly, and the anti-lock mechanism includes two hydraulic circuit interfaces, and the two hydraulic circuit interfaces are respectively connected to the first oil outlet and the second oil outlet.

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