Hydraulic braking system and application vehicle thereof

Abstract

The utility model relates to the technical field of automobile brake devices, in particular to a hydraulic brake system and an application vehicle thereof, which comprise a foot brake device, a foot brake oil storage tank, a hand brake device, a hand brake oil pumping device, a brake master cylinder and a brake caliper, the foot brake device is connected with the brake master cylinder, the hand brake device is connected with the hand brake oil pumping device, the hand brake oil pumping device comprises a first oil port, the brake master cylinder comprises a second oil port, a third oil port, a fourth oil port and a fifth oil port, the first oil port is connected with the fourth oil port, and the fifth oil port is connected with the second oil port. The second oil port is connected with the foot brake oil storage tank, and the third oil port and the fifth oil port are both connected with a brake caliper; a brand-new design of the brake master cylinder is provided, a foot brake and a hand brake are linked at the same time under the condition that a liquid separating valve is not used, the brake master cylinder is applied to an ABS or ESC vehicle, the occupied space of equipment and valves and pipelines in the equipment are reduced, the flexibility of space arrangement is improved, and the cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile brake device, concretely relates to a hydraulic brake system and vehicle applied thereof. BACKGROUND

[0002] Off-road vehicles such as friction vehicles and sand vehicles are all equipped with hydraulic brake systems to realize speed reduction and parking. However, the current traditional master cylinder (piston seal-seal on piston) with compensation hole and center valve has a long axial space, and there is a linkage valve (liquid distribution valve) between the hand brake and the foot brake, which occupies a large space and has poor space arrangement flexibility and high cost. The traditional master cylinder with compensation hole is not suitable for ABS / ESC application, and the hydraulic impact during ABS / ESC operation can easily damage the leather cup. Passenger cars have been replaced by plunger type master cylinders.

[0003] Patent CN201210139380.8 provides a plunger type hydraulic brake master cylinder, which mainly uses plunger type oil compensation to shorten the cylinder length and save space. However, it is only applied to a single foot brake, and no special design is made for the linkage between the hand brake and the foot brake. Patent CN202421277498.1 provides a hydraulic brake system and vehicle, which uses a power assist assembly to increase the pressure of the hydraulic fluid delivered to the brake pump to realize brake assist, and improves the problems of large foot pedal force and stroke, delayed pressure building before braking, and brake response lag in the prior art. However, no special design is made for the linkage between the hand brake and the foot brake.

[0004] Therefore, it is urgent to further study the brake system of the vehicle and propose a new design of brake master cylinder to simultaneously link the foot brake and the hand brake without using a liquid distribution valve, so as to be applied to vehicles with ABS or ESC, reduce the space occupied by the equipment and the valves and pipelines in the equipment, and increase the flexibility of space arrangement and reduce the cost. UTILITY MODEL CONTENTS

[0005] To solve the above problems, the utility model provides a hydraulic brake system and vehicle applied thereof, and proposes a new design of brake master cylinder to simultaneously link the foot brake and the hand brake without using a liquid distribution valve, so as to be applied to vehicles with ABS or ESC, reduce the space occupied by the equipment and the valves and pipelines in the equipment, and increase the flexibility of space arrangement and reduce the cost.

[0006] In one aspect, the utility model provides a kind of hydraulic braking system, including foot brake device, foot brake oil tank, hand brake device, hand brake pump oil device, brake master cylinder and brake caliper;The foot brake device is connected with the brake master cylinder, the hand brake device is connected with the hand brake pump oil device, the hand brake pump oil device includes first oil port, the brake master cylinder includes second oil port, third oil port, fourth oil port and fifth oil port, the first oil port is connected with the fourth oil port, the second oil port is connected with the foot brake oil tank, the third oil port and the fifth oil port are connected with brake caliper.

[0007] The hydraulic braking system of the utility model has one oil port for connecting the hand brake pump oil device, and corresponding structures are provided, so that the hand brake is also included in the hydraulic braking system, and the brake calipers corresponding to the four wheels can be simultaneously braked in the case of foot brake, and the brake caliper corresponding to the fifth oil port can be braked in the case of hand brake, compared with conventional equipment, the number of brake devices corresponding to hand brake and pipelines connected with brake calipers is reduced, the flexibility of space arrangement is increased, and the cost is reduced.

[0008] Further, the hand brake pump oil device includes an oil storage portion and a plunger portion, the plunger portion is connected with the hand brake device, and a through hole is arranged between the oil storage portion and the plunger portion.

[0009] Further, first and second through holes are arranged between the oil storage portion and the plunger portion, the plunger portion includes a plunger and a first pressure chamber, the plunger is arranged below the first through hole, the first pressure chamber is connected with the oil storage portion through the second through hole, and the first pressure chamber is connected with the first oil port.

[0010] Further, the plunger includes a first plunger portion, a second plunger portion and a third plunger portion, first sealing members are arranged between the first plunger portion and the second plunger portion and between the second plunger portion and the third plunger portion.

[0011] Further, the brake master cylinder includes a first piston, a second pressure chamber, a second piston and a third pressure chamber, the first piston is connected with the foot brake device, a third through hole is arranged on the first piston, a fourth through hole is arranged on the second piston, the second pressure chamber is connected with the third through hole and the third oil port, and the third pressure chamber is connected with the fourth through hole and the fifth oil port.

[0012] Further, when the first piston is in an initial position, the third through hole is connected with the second oil port, and when the second piston is in an initial position, the fourth through hole is connected with the fourth oil port.

[0013] Further, the third through hole is provided with a second sealing member when the first piston is not in the initial position, and the fourth through hole is provided with a third sealing member when the second piston is not in the initial position.

[0014] Preferably, the second sealing member and the third sealing member each have a bifurcated portion in cross section, and the bifurcated portion faces away from the connection between the foot brake device and the master cylinder.

[0015] The bifurcated portion is, for example, the side of a sealing member with a "C" or "E" shaped cross section, and since the second sealing member and the third sealing member are both sealing members with a "C" or "E" shaped cross section, they mostly play the same role, but the third sealing member can allow the pressure in the pressure chamber to be specially increased in the case of a foot brake followed by a powerful hand brake, thereby increasing the braking force, so in the remainder of the specification, the names of the two are simplified and both are referred to as "second sealing member".

[0016] Further, the master cylinder further comprises a limiting device, and the second piston is further provided with a U-shaped groove corresponding to the limiting device, for limiting the reverse movement of the second piston to the initial position.

[0017] Further, the brake caliper comprises a front wheel brake caliper and a rear wheel brake caliper, the third oil port is connected with the rear wheel brake caliper, and the fifth oil port is connected with the front wheel brake caliper.

[0018] In another aspect, the utility model also provides a vehicle comprising the hydraulic brake system.

[0019] The utility model has the beneficial technical effects of:

[0020] 1. The utility model provides a hydraulic brake system and vehicle thereof, proposes a brand -new brake master cylinder's design, simultaneously links up foot brake and hand brake under the condition of not using the distributor valve, to be applied to the vehicle of ABS or ESC, reduces the equipment occupied space and the valve and pipeline in the equipment, to increase the flexibility of space arrangement and reduce the cost.

[0021] 2. The utility model ingeniously improves the structure of hand brake pump oil device and brake master cylinder, so that hand brake and foot brake can work respectively or simultaneously under the same brake system, and the limiting structure of the second piston can further stably realize simultaneous work, improve the stability and safety of brake system operation.

[0022] 3. The utility model discloses a sealing element with a "C" or "E" cross section is used to improve the efficiency of the braking system operation, on one hand, the through hole and the sealing element are used in the hand brake pump oil device, can keep the sealing property of pressure cavity while using oil to lubricate, on the other hand, the through hole and the sealing element are used in the brake master cylinder, can improve the sealing property of two pressure cavities significantly, can specially improve the pressure of pressure cavity, increase the braking force under the condition of the front foot brake and the rear powerful hand brake. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the structure schematic diagram of hydraulic braking system of the utility model;

[0024] Figure 2 It is sectional structure schematic diagram of hand brake pump oil device of the utility model;

[0025] Figure 3 It is sectional structure schematic diagram of brake master cylinder of the utility model;

[0026] Reference Signs: 1-foot brake device, 11-foot brake connecting rod, 2-foot brake oil tank, 3-hand brake device, 4-hand brake pump oil device, 41-hand brake connecting rod, 42-plunger first part, 43-plunger second part, 44-plunger third part, 45-first sealing element, 46-first through hole, 47-second through hole, 48-first pressure cavity, 49-first oil port, 5-brake master cylinder, 51-first piston, 511-third through hole, 52-second pressure cavity, 53-second piston, 531-fourth through hole, 54-third pressure cavity, 55-limiting screw pin, 56-second sealing element, 571-second oil port, 572-third oil port, 573-fourth oil port, 574-fifth oil port, 6-brake caliper;L indicates the setting area of hollow U-shaped groove corresponding to the limiting screw pin 55 in the corresponding position of the initial position of the second piston 53. DETAILED DESCRIPTION

[0027] The utility model will be further explained in detail below in combination with the drawings and examples. Same parts are indicated with same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the words "bottom surface" and "top surface", "inner" and "outer" refer to the directions towards or away from the geometric center of a particular component.

[0028] As Figure 1As shown in the utility model, the hydraulic brake system comprises a foot brake device 1, a foot brake oil tank 2, a hand brake device 3, a hand brake pump oil device 4, a brake master cylinder 5 (a brake master pump) and brake calipers 6 (brake sub-pumps), the brake calipers 6 comprise four brake sub-pumps, corresponding to four wheels (a left front wheel FL, a right front wheel FR, a left rear wheel RL and a right rear wheel RR) of the automobile respectively, and the specific structure refers to the prior art; wherein the foot brake device 1 is connected with the brake master cylinder 5 through a foot brake connecting rod 11, the hand brake device 3 is connected with the hand brake pump oil device 4 through a hand brake connecting rod 41, the foot brake oil tank 2 and the hand brake pump oil device 4 are connected with the brake master cylinder 5 through corresponding oil ports respectively, and the brake master cylinder 5 is connected with the brake calipers 6 through corresponding oil ports.

[0029] As shown in the sectional structure diagram of the hand brake pump oil device 4 of the utility model, Figure 2 The hand brake connecting rod 41 is connected with a plunger first part 42, the plunger first part 42 and a plunger second part 43 are directly connected and one of the first sealing members 45 is arranged at the connecting position, the plunger second part 43 and a plunger third part 44 are directly connected and the other first sealing member 45 is arranged at the connecting position, the sectional structure of the first sealing member 45 is "C" shape and faces the direction of a first oil port 49, the first oil port 49 is communicated with a first pressure cavity 48, and a spring is arranged in the first pressure cavity 48; the hand brake pump oil device 4 comprises an oil storage part and a plunger part, and the first through hole 46 and the second through hole 47 are arranged between the oil storage part and the plunger part.

[0030] As shown in the sectional structure diagram of the brake master cylinder 5 of the utility model, Figure 3As shown, the center of the brake master cylinder 5 is sequentially the first piston 51, the second pressure cavity 52, the second piston 53 and the third pressure cavity 54 from left to right, and the second pressure cavity 52 and the third pressure cavity 54 are internally provided with springs; the first piston 51 is provided with a limiting piece on the left side to limit its continuous movement to the left side, and the first piston 51 is centrally provided with a notch corresponding to the structure of the foot brake connecting rod 11, when the foot brake is stepped on, the foot brake connecting rod 11 moves rightward to push the first piston 51 to generate corresponding movement, and when the first piston 51 is reset by hydraulic pressure, the foot brake connecting rod 11 is also reset to reset the foot brake pedal; the first piston 51 is provided with a third through hole 511, the second oil port 571 can communicate with the second pressure cavity 52 through the third through hole 511 at the initial position, the second pressure cavity 52 also communicates with the third oil port 572, and one of the second sealing pieces 56 is arranged on the right side of the second oil port 571 and the third through hole 511 at the initial position; the second piston 53 is provided with a U-shaped groove at the bottom of the left side, the area of the U-shaped groove is marked as L in the figure, the U-shaped groove corresponds to the limiting screw pin 55, so that the second piston 53 cannot move to the left of the initial position, and the limiting screw pin 55 is a limiting device fixed at the position of the brake master cylinder 5 shown in the figure, and similarly, the second piston 53 is provided with a fourth through hole 531, the fourth oil port 573 can communicate with the third pressure cavity 54 through the fourth through hole 531 at the initial position, the third pressure cavity 54 also communicates with the fifth oil port 574, and the other second sealing piece 56 is arranged on the right side of the fourth oil port 573 and the fourth through hole 531 at the initial position; the cross section of the sealing piece 56 is "E" shape and faces the direction of the fifth oil port 574; the third oil port 572 is connected with the brake caliper 6 pipeline corresponding to the left rear wheel RL and the right rear wheel RR, and the fifth oil port 574 is connected with the brake caliper 6 pipeline corresponding to the left front wheel FL and the right front wheel FR.

[0031] The working principle of the hydraulic brake system of the utility model is as follows:

[0032] The working principle of the hand brake is as follows: the operator starts the hand brake device 3, the hand brake connecting rod 41 drives the plunger first part 42, the plunger second part 43 and the plunger third part 44 to the left side, the oil in the hand brake pump oil device 4 enters the space between the plunger and the corresponding inner wall on one hand to play a lubricating role, and enters the first pressure cavity 48 along the second through hole 47 on the other hand, when the plunger third part 44 is pushed to completely enter the first pressure cavity 48, the first sealing piece 45 completely blocks the second through hole 47 to avoid the backflow of oil to the oil storage part, at this time, the oil in the first pressure cavity 48 is extruded to generate hydraulic pressure, enters the fourth oil port 573 along the first oil port 49 to generate hydraulic pressure on the third pressure cavity 54, and the oil in the third pressure cavity 54 is pumped into the brake caliper 6 corresponding to the left front wheel FL and the right front wheel FR along the fifth oil port 574 to simultaneously brake the left front wheel and the right front wheel, so as to realize the speed reduction and parking of the vehicle.

[0033] The working principle of the foot brake is as follows: the operator starts the foot brake device 1, the foot brake connecting rod 11 moves rightward to push the first piston 51, the third through hole 511 is no longer communicated with the second oil port 571, the sealing element 56 arranged at the third through hole 511 seals the third through hole 511, at this time, the oil in the second pressure cavity 52 is extruded to generate hydraulic pressure, and the spring in the second pressure cavity 52 is pressed, the hydraulic pressure and the spring simultaneously act on the second piston 53 to drive the second piston 53 to move rightward, the fourth through hole 531 is no longer communicated with the fourth oil port 573, the sealing element 56 arranged at the fourth through hole 531 seals the fourth through hole 511, at this time, the oil in the third pressure cavity 54 is extruded to generate hydraulic pressure, until the pressure in the second pressure cavity 52 and the third pressure cavity 54 reaches balance, the oil in the second pressure cavity 52 and the third pressure cavity 54 is pumped into the brake caliper 6 along the third oil port 572 and the fifth oil port 574 respectively, and the four wheels of the automobile are simultaneously braked to realize driving speed reduction and parking.

[0034] Working principle of simultaneous braking of hand brake and foot brake: if the hand brake brakes first, refer to the description in (I), the oil in the third pressure chamber 54 is pumped into the brake calipers 6 corresponding to the left front wheel FL and the right front wheel FR along the fifth oil port 574, and the left front wheel and the right front wheel are simultaneously braked, and since the limiting screw pin 55 exists, the second piston 53 cannot move to the left side of the initial position, at this time the operator starts the foot brake device 1, refer to the description in (II), the first piston 51 moves to the right, but since the third pressure chamber 54 already has pressure and the pressure is greater than the pressure inside the second pressure chamber 52, only when the foot brake is stepped down strongly can the second piston 53 be slightly driven to move to the right side, and the oil in the second pressure chamber 52 is pumped into the brake calipers 6 corresponding to the left rear wheel RL and the right rear wheel RR along the third oil port 572, and the left rear wheel and the right rear wheel are simultaneously braked, according to the above working principle, in the case of hand brake braking first, the pressure building stroke of the foot brake will be shorter than that of pure foot brake braking, and the foot feeling will be relatively hard. If the foot brake brakes first, refer to the description in (II), the oil inside the second pressure chamber 52 and the third pressure chamber 54 is pumped into the brake calipers 6 along the third oil port 572 and the fifth oil port 574 respectively, and the four wheels of the automobile are simultaneously braked, at this time, when the hand brake is slightly driven, that is, the working hydraulic pressure of the hand brake is less than the working hydraulic pressure of the foot brake, the working liquid of the hand brake cannot enter the third pressure chamber 54, at this time, the pressure building stroke of the hand brake will be shorter than that of pure hand brake braking, and the hand feeling will be relatively hard; if the hand brake is driven strongly, that is, the working hydraulic pressure of the hand brake is greater than the working hydraulic pressure of the foot brake, the working liquid of the hand brake will pass through the second sealing member 56 in the shape of "E" and enter the third pressure chamber 54, thereby increasing the pressure inside the third pressure chamber 54, and at the same time, the second piston 53 is driven to move to the left side, thereby increasing the pressure inside the second pressure chamber 52, and the increased hydraulic pressure in the second pressure chamber 52 and the third pressure chamber 54 is transmitted to the brake calipers 6, thereby strengthening the braking force of the four wheels, if the pressure exceeds the pressure upper limit of the foot brake device 1 at this time, the foot brake connecting rod 11 retreats a certain distance, the working hydraulic pressure decreases, and the pressure of the second pressure chamber 52 and the third pressure chamber 54 reaches a new balance.

[0035] The preferred embodiments of the present application are described above, the protection scope of the present application is not limited to the above-mentioned embodiments, any technical solutions falling within the concept of the present application shall fall within the protection scope of the present application. It should be noted that, for ordinary technical personnel in the technical field, some improvements and decorations without departing from the principles of the present application shall also be considered as the protection scope of the present application.

Claims

1. A hydraulic brake system characterized by, The hydraulic brake system comprises a foot brake device, a foot brake oil tank, a hand brake device, a hand brake pump oil device, a brake master cylinder and brake calipers; the foot brake device is connected with the brake master cylinder, the hand brake device is connected with the hand brake pump oil device, the hand brake pump oil device comprises a first oil port, the brake master cylinder comprises a second oil port, a third oil port, a fourth oil port and a fifth oil port, the first oil port is connected with the fourth oil port, the second oil port is connected with the foot brake oil tank, and the third oil port and the fifth oil port are both connected with the brake calipers.

2. The hydraulic brake system of claim 1, wherein, The hand brake pump oil device comprises an oil storage part and a plunger part, the plunger part is connected with the hand brake device, and a through hole is arranged between the oil storage part and the plunger part.

3. The hydraulic brake system of claim 2, wherein, First and second through holes are arranged between the oil storage part and the plunger part; the plunger part comprises a plunger and a first pressure cavity, the plunger is arranged below the first through hole, the first pressure cavity is connected with the oil storage part through the second through hole, and the first pressure cavity is connected with the first oil port.

4. The hydraulic brake system of claim 3, wherein, The plunger comprises a first plunger part, a second plunger part and a third plunger part, and first sealing members are arranged between the first plunger part and the second plunger part and between the second plunger part and the third plunger part.

5. Hydraulic brake system according to any of claims 1 to 4, characterized in that The brake master cylinder comprises a first piston, a second pressure cavity, a second piston and a third pressure cavity, the first piston is connected with the foot brake device, a third through hole is arranged on the first piston, a fourth through hole is arranged on the second piston, the second pressure cavity is connected with the third through hole and the third oil port, and the third pressure cavity is connected with the fourth through hole and the fifth oil port.

6. The hydraulic brake system of claim 5, wherein, When the first piston is in an initial position, the third through hole is connected with the second oil port, and when the second piston is in an initial position, the fourth through hole is connected with the fourth oil port.

7. The hydraulic brake system of claim 5, wherein, When the first piston is not in the initial position, a second sealing member is arranged on the third through hole, and when the second piston is not in the initial position, a third sealing member is arranged on the fourth through hole.

8. The hydraulic brake system of claim 5, wherein, The brake master cylinder further comprises a limiting device, and the second piston is further provided with a U-shaped groove corresponding to the limiting device, for limiting reverse movement of the second piston to the initial position.

9. The hydraulic brake system of claim 1, wherein, The brake calipers comprise front wheel brake calipers and rear wheel brake calipers, the third oil port is connected with the rear wheel brake calipers, and the fifth oil port is connected with the front wheel brake calipers. 10.A vehicle comprising the hydraulic brake system according to any one of claims 1-9.

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