Piston driving device, brake master cylinder, brake assembly and vehicle

Abstract

The utility model discloses a piston driving device, a brake master cylinder, a brake assembly and a vehicle. The piston driving device comprises a limiting seat and a piston rod; one end of the piston rod is detachably connected with the limiting seat, so that the piston rod and the limiting seat can be kept in a combined state. According to the utility model, the piston rod and the limiting seat are kept in a combined state, and the piston can be installed in the combined state, so that installation in the piston and butt-joint assembly with a pedal are facilitated, and the assembly efficiency is remarkably improved.

Description

Technical Field

[0001] The utility model generally relates to the technical field of vehicle brake systems, and more specifically to a piston drive device, a brake master cylinder, a brake assembly and a vehicle. Background Art

[0002] The automobile braking system includes a brake assembly, an input rod and a pedal. The pedal is connected to the input rod, and the input rod is connected to the brake assembly. When the driver brakes, the pedal moves in a fan-shaped area, so the input rod needs to have a certain swing angle relative to the brake assembly to transmit the pedal force to the brake master cylinder and build pressure in the master cylinder. Due to assembly requirements, the input rod cannot be easily pulled out when assembled on the pressure-building piston or other components, and the input rod should not shake at will during installation, and can be stably docked and assembled with the pedal, so the input rod needs to be reliably limited.

[0003] Therefore, it is necessary to provide a piston driving device, a brake master cylinder, a brake assembly and a vehicle to at least partially solve the above problems. Utility Model Content

[0004] A series of simplified concepts are introduced in the utility model content section, which will be further described in detail in the detailed implementation section. The utility model content section of the utility model does not mean to attempt to define the key features and essential technical features of the technical solution claimed for protection, nor does it mean to attempt to determine the scope of protection of the technical solution claimed for protection.

[0005] In order to at least partially solve the above problems, the first aspect of the present invention provides a piston drive device, comprising:

[0006] Limited seat;

[0007] A piston rod, wherein the piston rod can be inserted into the limit seat, and one end of the piston rod is detachably connected to the limit seat so that the piston rod and the limit seat can maintain a combined state.

[0008] Optionally, the limiting seat is provided with a limiting groove, and the limiting groove is arranged along the axial direction of the limiting seat;

[0009] A wing plate is provided at one end of the piston rod, and the wing plate protrudes along the radial direction of the piston rod. The wing plate can be connected to the limiting groove so that the piston rod and the limiting seat maintain a combined state.

[0010] Optionally, the limiting seat includes:

[0011] A base, wherein the base is provided with an axial through hole;

[0012] A plurality of limit plates are provided on the first end surface of the base, the plurality of limit plates are provided around the through hole and extend along the axial direction of the base, and a limit groove is provided between adjacent limit plates.

[0013] Optionally, a limiting protrusion is provided on the side of the limiting plate, and the limiting protrusion can reduce the gap between adjacent limiting plates. The limiting protrusion can limit the wing plate, keep the wing plate in the limiting groove or prevent the wing plate from entering the limiting groove.

[0014] Optionally, the limit seat further includes:

[0015] An entrance and exit is arranged at the end of the limiting groove for the wing plate to enter and exit the limiting groove, and the width of the entrance and exit gradually increases as it moves away from the bottom of the limiting groove.

[0016] Optionally, the limit seat further includes:

[0017] A plurality of positioning blocks are arranged on the second end surface of the base, and the positioning blocks are used to abut against the piston to connect and fix the limit seat with the piston.

[0018] Optionally, the piston rod comprises:

[0019] The rod body, the wing plate is arranged close to the first end of the rod body, and the wing plate is in an arc shape.

[0020] Optionally, the diameter of the rod body gradually decreases as approaching the first end.

[0021] Optionally, the limiting seat is an elastic member.

[0022] A second aspect of the utility model provides a brake master cylinder, comprising a piston drive device according to any one of the above technical solutions.

[0023] Optionally, the brake master cylinder further includes:

[0024] A cylinder barrel, wherein a piston chamber is provided inside the cylinder barrel;

[0025] A piston is disposed in the piston chamber and is capable of moving axially in the piston chamber.

[0026] Optionally, the brake master cylinder further includes:

[0027] The piston is provided with a connecting cavity extending in the axial direction, a limiting seat is provided in the connecting cavity, an inlet and outlet of the limiting seat is toward the bottom end of the connecting cavity, and one end of the piston rod can extend into the connecting cavity and push the bottom end of the connecting cavity.

[0028] Optionally, a slot is provided on the inner wall of the connecting cavity, and the limiting seat is fixedly connected to the slot.

[0029] Optionally, the brake master cylinder further includes:

[0030] A cylinder cover is connected and assembled with the cylinder barrel, and the cylinder cover can limit the moving stroke of the piston.

[0031] A third aspect of the utility model provides a brake assembly, comprising a brake master cylinder according to any one of the above technical solutions.

[0032] A fourth aspect of the utility model provides a vehicle, comprising a brake assembly according to any one of the above technical solutions.

[0033] According to a piston drive device, a brake master cylinder, a brake assembly and a vehicle of the utility model, the piston drive device can install the piston in a combined state by keeping the piston rod and the limit seat in a combined state, thereby facilitating installation into the piston; when the piston rod and the limit seat are kept in a combined state, the piston rod will not shake at will, thereby facilitating docking and assembly with the pedal and significantly improving assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The following drawings of the embodiments of the present invention are used as part of the present invention for understanding the present invention. The drawings show the embodiments of the present invention and their descriptions, and are used to explain the principles of the present invention. In the drawings,

[0035] Figure 1 A cross-sectional view of a brake master cylinder according to a preferred embodiment of the present utility model;

[0036] Figure 2 for Figure 1 Sectional view along AA;

[0037] Figure 3 It is a front view of a piston drive device according to a preferred embodiment of the utility model;

[0038] Figure 4 It is a three-dimensional diagram of a piston drive device according to a preferred embodiment of the utility model;

[0039] Figure 5 It is a front view of a limiting seat according to a preferred embodiment of the utility model;

[0040] Figure 6 It is a left view of a limiting seat according to a preferred embodiment of the utility model;

[0041] Figure 7 It is a right side view of a limiting seat according to a preferred embodiment of the utility model;

[0042] Figure 8 It is a front view of a piston rod according to a preferred embodiment of the utility model;

[0043] Fig. 9 It is a cross-sectional view of a piston according to a preferred embodiment of the utility model.

[0044] Description of reference numerals:

[0045] 1: Cylinder 101: Piston chamber

[0046] 2: Cylinder head 3: Piston

[0047] 301: Connecting cavity 302: Card slot

[0048] 4: Limiting ring 5: Buffer pad

[0049] 6: Limit seat 601: Limit plate

[0050] 602: Base 603: Positioning block

[0051] 604: Limiting slot 605: Entrance and exit

[0052] 606: Limiting protrusion 607: Through hole

[0053] 7: Piston rod 701: Rod body

[0054] 702: second end 703: wing plate

[0055] 704: First end 8: Brake master cylinder DETAILED DESCRIPTION

[0056] In the following description, a large number of specific details are given to provide a more thorough understanding of the utility model. However, it is obvious to those skilled in the art that the utility model can be implemented without one or more of these details. In other examples, in order to avoid confusion with the utility model, some technical features known in the art are not described.

[0057] In order to thoroughly understand the utility model, a detailed description will be provided in the following description. It should be understood that these embodiments are provided to make the disclosure of the utility model thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. Obviously, the implementation of the embodiments of the utility model is not limited to the specific details familiar to those skilled in the art. The preferred embodiments of the utility model are described in detail below, but in addition to these detailed descriptions, the utility model may also have other embodiments.

[0058] Ordinal numbers such as "first" and "second" cited in the present invention are merely identifiers and do not have any other meanings, such as a specific order, etc. Moreover, for example, the term "first component" itself does not imply the existence of the "second component", and the term "second component" itself does not imply the existence of the "first component".

[0059] It should be noted that the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside" and similar expressions used in the present invention are for illustrative purposes only and are not restrictive.

[0060] The utility model discloses a piston driving device, a brake master cylinder, a brake assembly and a vehicle.

[0061] Now, exemplary embodiments according to the present invention will be described in more detail with reference to the accompanying drawings.

[0062] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, in a preferred embodiment, a piston driving device comprises: a limit seat 6 and a piston rod 7;

[0063] The piston rod 7 can be inserted into the limiting seat 6, and one end of the piston rod 7 is detachably connected to the limiting seat 6, so that the piston rod 7 and the limiting seat 6 can maintain a combined state.

[0064] When the piston rod 7 and the stopper seat 6 are in a combined state, the piston rod 7 and the stopper seat 6 are preferably coaxial. When the stopper seat 6 is installed in the piston 3, the stopper seat 6 and the piston 3 can be coaxial, so that the piston rod 7 and the piston 3 can also be coaxial.

[0065] When the piston driving device is installed in the piston 3, the piston rod 7 and the limit seat 6 remain in a combined state, and when they are docked and assembled with the pedal, the piston rod 7 and the limit seat 6 also remain in a combined state. However, when the driver actually uses the brake assembly 8, the piston rod 7 and the limit seat 6 are no longer in a combined state, but the piston rod 7 is in a movable state relative to the limit seat 6. The piston rod 7 has a certain swing angle relative to the brake master cylinder 8, so that the pedal force can be transmitted to the brake master cylinder, and the master cylinder pressure building piston 3 can move axially to build pressure.

[0066] The piston drive device in this embodiment can install the piston in the combined state by keeping the piston rod and the limit seat in the combined state, thereby facilitating installation into the piston. When the piston rod and the limit seat are kept in the combined state, the piston rod will not shake at will, thereby facilitating docking and assembly with the pedal, and significantly improving assembly efficiency.

[0067] In one embodiment, if Figure 3 , Figure 4 , Figure 5 As shown, the limiting seat 6 is provided with a limiting groove 604, and the limiting groove 604 is arranged along the axial direction of the limiting seat 6; the limiting groove 604 is a straight groove, and three limiting grooves 604 are arranged in the figure, and more than three limiting grooves 604 can be arranged according to design requirements;

[0068] A wing plate 703 is provided at one end of the piston rod 7 , and the wing plate 703 protrudes along the radial direction of the piston rod 7 . The wing plate 703 can be connected to the limiting groove 604 so that the piston rod 7 and the limiting seat 6 maintain a combined state.

[0069] A plurality of wing plates 703 are provided at one end of the piston rod 7 , and each wing plate 703 is connected to a limiting groove 604 , so that the piston rod 7 and the limiting seat 6 maintain a combined state.

[0070] In order to correspond to the limiting groove 604, three wing plates 703 are provided in the figure, and each wing plate 703 has the same structure and is combined to form a star shape. More than three wing plates 703 can also be provided according to design requirements.

[0071] The thickness of the wing plate 703 is smaller than the width of the limiting groove 604 , so as to facilitate smooth entry and exit of the limiting groove 604 .

[0072] In one embodiment, if Figure 5 , Figure 6 , Figure 7 As shown, the limiting seat 6 includes:

[0073] The base 602 is provided with an axial through hole 607, and the piston rod 7 can be inserted into the through hole 607 when inserted into the limit seat 6;

[0074] A plurality of limiting plates 601 are disposed on the first end surface of the base 602 , the plurality of limiting plates 601 are disposed around the through hole 607 and extend along the axial direction of the base 602 , and a limiting groove 604 is disposed between adjacent limiting plates 601 .

[0075] In the figure, three limiting plates 601 are provided, and each limiting plate 601 has the same structure, specifically an arc-shaped plate structure, and the combination is cylindrical. More than three limiting plates 601 can also be provided according to design requirements.

[0076] The limiting plate 601 and the base 602 are an integral structure and can be integrally formed during manufacture. A reinforcing rib can also be provided between the limiting plate 601 and the base 602 to improve the connection strength between the limiting plate 601 and the base 602.

[0077] In one embodiment, if Figure 3 , Figure 4 , Figure 5As shown, a limiting protrusion 606 is provided on the side of the limiting plate 601, and the limiting protrusion 606 can reduce the gap between adjacent limiting plates 601. The limiting protrusion 606 protrudes in the limiting groove 604. The limiting protrusion 606 can limit the wing plate 703, keep the wing plate 703 in the limiting groove 604, or prevent the wing plate 703 from entering the limiting groove 604.

[0078] In the figure, each limiting groove 604 is equivalent to being provided with two limiting protrusions 606, and the limiting protrusions 606 are hemispherical. The thickness of the wing plate 703 will be greater than the distance between the two limiting protrusions 606. By providing the limiting protrusions 606, the wing plate 703 will be hindered to a certain extent when entering and exiting the limiting groove 604, so that one end of the piston rod 7 is detachably connected to the limiting seat 6. When the piston rod 7 and the limiting seat 6 need to maintain a combined state, the limiting protrusion 606 can keep the wing plate 703 in the limiting groove 604. When the piston rod 7 and the limiting seat 6 need to move relative to each other, the limiting protrusion 606 can prevent the wing plate 703 from entering the limiting groove 604. As long as the wing plate 703 is located outside the limiting groove 604, the piston rod 7 and the limiting seat 6 can move relative to each other, such as tilting or rotating.

[0079] In one embodiment, if Figure 3 , Figure 4 , Figure 5 As shown, the limiting seat 6 also includes:

[0080] The inlet and outlet 605 is arranged at the end of the limiting groove 604 for the wing plate 703 to enter and exit the limiting groove 604. The width of the inlet and outlet 605 gradually increases as it moves away from the bottom of the limiting groove 604, so that the inlet and outlet 605 is conical or trumpet-shaped. By designing the inlet and outlet 605 to be conical or trumpet-shaped, on the one hand, it is convenient for the wing plate 703 to enter and exit the limiting groove 604, and on the other hand, when the wing plate 703 is outside the limiting groove 604, the wing plate 703 can move within the range of the inlet and outlet 605, such as tilting or rotating, so that the piston rod 7 and the limiting seat 6 can move relative to each other. The angle of the inlet and outlet 605 can be determined according to actual needs, preferably not less than 90 degrees.

[0081] In order to correspond to the limiting groove 604, three entrances and exits 605 are provided in the figure, and the structure of each entrance and exit 605 is the same. More than three entrances and exits 605 can also be provided according to design requirements.

[0082] In one embodiment, if Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, the limiting seat 6 also includes:

[0083] A plurality of positioning blocks 603 are provided on the second end surface of the base 602 , and the positioning blocks 603 are used to abut against the piston 3 to connect and fix the limiting seat 6 and the piston 3 .

[0084] The plurality of positioning blocks 603 are combined into a cone, and the bottom of the cone is the largest diameter of the limit seat 6. Because the limit seat 6 is squeezed and deformed when it is installed in the piston 3, the block structure facilitates the deformation of the limit seat 6 by providing a plurality of positioning blocks 603.

[0085] In one embodiment, if Figure 3 , Figure 4 , Figure 8 As shown, the piston rod 7 comprises:

[0086] The rod body 701 includes a first end 704 and a second end 702 . The first end 704 is hemispherical or arc-shaped, and the second end 702 is provided with a connection structure.

[0087] The first end 704 is set to a spherical shape to facilitate the rotation of the piston rod 7 relative to the piston 3. The piston rod 7 has a certain swing angle relative to the brake master cylinder 8 to transmit the pedal force to the brake master cylinder and enable the master cylinder pressure building piston 3 to move axially to build pressure.

[0088] The connection structure can be a threaded or clamping structure, and can be butt-jointed and assembled with the pedal through the connection structure.

[0089] In one embodiment, if Figure 3 , Figure 4 , Figure 8 As shown, the wing plate 703 is disposed close to the first end 704 and is in an arc shape.

[0090] By setting the wing plate 703 to be in an arc shape, it is convenient for the wing plate 703 to enter and exit the limiting groove 604, and it is convenient for the piston rod 7 to rotate relative to the piston 3, and the arc-shaped wing plate 703 will not hinder the rotation process.

[0091] In one embodiment, if Figure 3 , Figure 4 , Figure 8 As shown, the diameter of the rod body 701 gradually decreases as it approaches the first end 704. The rod body 701 is tapered as a whole or includes a tapered section, and the first end 704 is arranged at the end with the smallest diameter. By setting the rod body 701 in a tapered shape or arranging a tapered section on the rod body 701, the rod body 701 has a movable margin in the through hole 607 of the base 602, which facilitates the rotation of the piston rod 7 relative to the piston 3, and the rod body 701 will not hinder the rotation process.

[0092] In one embodiment, if Figure 1 , Figure 2As shown, the limit seat 6 is made of non-metallic material. Non-metallic material such as rubber makes the limit seat 6 as a whole have a certain elastic deformation ability, which is convenient for installation in the piston 3.

[0093] like Figure 1 , Figure 2 , Fig. 9 As shown, an embodiment of the utility model further provides a brake master cylinder 8, comprising a piston drive device as described in any one of the above embodiments.

[0094] In one embodiment, the brake master cylinder 8 further comprises:

[0095] Cylinder 1, the interior of which is provided with a piston chamber 101; hydraulic oil can be input into the piston chamber 101;

[0096] The piston 3 is disposed in the piston chamber 101 and is capable of axially moving in the piston chamber 101 to transmit driving force to the hydraulic oil.

[0097] In one embodiment, the brake master cylinder 8 further comprises:

[0098] The cylinder cover 2 is connected and assembled with the cylinder barrel 1 , and the cylinder cover 2 can limit the moving stroke of the piston 3 .

[0099] In one embodiment, if Figure 1 , Fig. 9 As shown, the piston 3 is provided with a connecting cavity 301 extending along the axial direction, the limit seat 6 is arranged in the connecting cavity 301, the inlet and outlet 605 of the limit seat 6 is toward the bottom end of the connecting cavity 301, one end of the piston rod 7 can extend into the connecting cavity 301 and push the bottom end of the connecting cavity 301, specifically, the first end 704 of the piston rod 7 can extend into the connecting cavity 301.

[0100] The limiting seat 6 in the piston 3 can limit the piston rod 7 so that the piston rod 7 cannot be easily pulled out of the piston 3. In the connecting cavity 301, when the piston rod 7 and the limiting seat 6 are no longer in a combined state, the piston rod 7 can have a certain swing angle relative to the piston 3, and the first end 704 of the corresponding piston rod 7 in the connecting cavity 301 is set in a hemispherical groove.

[0101] The rear end of the connecting chamber 301 is an open end, and the piston driving device is installed into the connecting chamber 301 from the rear end. The piston 3 is provided with a limit ring 4 and a buffer pad 5 at this end. When the piston 3 moves, the buffer pad 5 can play a buffering role between the piston 3 and the cylinder cover 2.

[0102] In one embodiment, if Fig. 9 As shown, the inner wall of the connecting cavity 301 is provided with a clamping groove 302 , and the limiting seat 6 is clamped and fixed with the clamping groove 302 , specifically, the positioning block 603 is clamped and fixed with the clamping groove 302 .

[0103] The bottom surface of the positioning block 603 is flat, and after being clamped and fixed with the clamping groove 302 in the piston 3 , it will not be easily separated from the clamping groove 302 .

[0104] An embodiment of the utility model further provides a brake assembly, comprising the brake master cylinder 8 described in any one of the above embodiments.

[0105] The brake assembly also includes an oil pot and hydraulic pipelines. The oil pot is connected to the cylinder 1 of the brake master cylinder 8, and hydraulic oil is input into the piston chamber 101. When the driver brakes, he steps on the pedal, the pedal drives the piston rod 7 to move, the piston rod 7 drives the piston 3 to move, the piston 3 transmits driving force to the hydraulic oil, and the brake master cylinder 8 builds pressure.

[0106] The brake master cylinder 8 is connected to the wheel brake cylinders through hydraulic pipelines. When the brake master cylinder 8 builds pressure, the braking force can be transmitted to the wheel brake cylinders through the hydraulic pipelines, thereby braking the wheels.

[0107] An embodiment of the utility model further provides a vehicle, comprising the brake assembly described in any one of the above embodiments.

[0108] The vehicle may include a plurality of wheels, each of which is provided with a brake wheel cylinder, and the brake assembly is connected to the brake wheel cylinder to provide braking force for the brake wheel cylinder.

[0109] The utility model provides a piston driving device, a brake master cylinder, a brake assembly and a vehicle, which have the following characteristics:

[0110] The piston drive device can be installed in the piston in the combined state by keeping the piston rod and the limit seat in the combined state, thereby facilitating installation into the piston. When the piston rod and the limit seat are kept in the combined state, the piston rod will not shake at will, thereby facilitating docking and assembly with the pedal, significantly improving assembly efficiency. The piston drive device has the characteristics of simple structure, easy installation, stability and reliability.

[0111] The processes and steps described in all the above preferred embodiments are only examples. Unless adverse effects occur, various processing operations can be performed in a sequence different from the sequence of the above processes. The sequence of steps in the above processes can also be increased, merged or deleted according to actual needs.

[0112] In understanding the scope of the present invention, the term "comprising" and its derivatives as used herein are intended to be open terms, which specify the existence of the recorded features, elements, components, groups, wholes and / or steps, but do not exclude the existence of other unrecorded features, elements, components, groups, wholes and / or steps. This concept also applies to words with similar meanings, such as the terms "including", "having" and their derivatives.

[0113] The terms "attached" or "attached" as used herein include: a configuration where an element is directly secured to another element by directly securing the element to the other element; a configuration where an element is indirectly secured to another element by securing the element to an intermediate member which in turn is secured to the other element; and a configuration where one element is integral with the other element, i.e., one element is substantially a part of the other element. This definition also applies to words with similar meanings such as "connect," "connect," "couple," "mount," "bond," "fix," and their derivatives. Finally, terms of degree such as "substantially," "approximately," and "approximately" as used herein represent the amount of deviation that modifies the term such that the end result will not be significantly changed.

[0114] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein are only for describing specific implementation purposes and are not intended to limit the present invention. The features described herein in one embodiment may be applied to another embodiment alone or in combination with other features, unless the feature is not applicable or otherwise specified in the other embodiment.

[0115] The utility model has been described through the above-mentioned embodiments, but it should be understood that the above-mentioned embodiments are only for the purpose of example and description, and are not intended to limit the utility model to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the utility model is not limited to the above-mentioned embodiments, and more variations and modifications can be made according to the teachings of the utility model, and these variations and modifications all fall within the scope of protection claimed by the utility model.

Claims

1. A piston drive device, characterized in that: include: Limit seat (6); A piston rod (7), wherein the piston rod (7) can be inserted into the limit seat (6), and one end of the piston rod (7) is detachably connected to the limit seat (6) so that the piston rod (7) and the limit seat (6) can maintain a combined state.

2. The piston drive device according to claim 1, characterized in that: The limiting seat (6) is provided with a limiting groove (604), and the limiting groove (604) is arranged along the axial direction of the limiting seat (6); A wing plate (703) is provided at one end of the piston rod (7), and the wing plate (703) protrudes radially along the piston rod (7). The wing plate (703) can be connected to the limiting groove (604) so ​​that the piston rod (7) and the limiting seat (6) maintain a combined state.

3. The piston drive device according to claim 2, characterized in that: The limiting seat (6) comprises: A base (602), wherein the base (602) is provided with an axial through hole (607); A plurality of limit plates (601), wherein the plurality of limit plates (601) are arranged on the first end surface of the base (602), the plurality of limit plates (601) are arranged around the through hole (607) and extend along the axial direction of the base (602), and a limit groove (604) is arranged between adjacent limit plates (601).

4. The piston drive device according to claim 3, characterized in that: A limiting protrusion (606) is provided on the side of the limiting plate (601), and the limiting protrusion (606) can reduce the gap between adjacent limiting plates (601). The limiting protrusion (606) can limit the wing plate (703), keep the wing plate (703) in the limiting groove (604) or prevent the wing plate (703) from entering the limiting groove (604).

5. The piston drive device according to claim 2, characterized in that: The limiting seat (6) also includes: An entrance and exit (605) is arranged at the end of the limiting groove (604) for the wing plate (703) to enter and exit the limiting groove (604), and the width of the entrance and exit (605) gradually increases as it moves away from the bottom of the limiting groove (604).

6. The piston drive device according to claim 3, characterized in that: The limiting seat (6) also includes: A plurality of positioning blocks (603) are arranged on the second end surface of the base (602), and the positioning blocks (603) are used to abut against the piston (3) to connect and fix the limit seat (6) and the piston (3).

7. The piston drive device according to claim 2, characterized in that: The piston rod (7) comprises: The rod body (701) is provided with the wing plate (703) close to the first end (704) of the rod body (701), and the wing plate (703) is in an arc shape.

8. The piston drive device according to claim 7, characterized in that: The diameter of the rod body (701) gradually decreases as it approaches the first end (704).

9. The piston drive device according to claim 1, characterized in that: The limiting seat (6) is an elastic member.

10. A brake master cylinder, characterized in that: Comprising a piston drive device according to any one of claims 1-9.

11. The brake master cylinder according to claim 10, characterized in that: Also includes: A cylinder barrel (1), wherein a piston chamber (101) is provided inside the cylinder barrel (1); A piston (3) is disposed in the piston chamber (101) and is capable of moving axially in the piston chamber (101).

12. The brake master cylinder according to claim 11, characterized in that: Also includes: The piston (3) is provided with a connecting cavity (301) extending in the axial direction, a limiting seat (6) is provided in the connecting cavity (301), an inlet and outlet (605) of the limiting seat (6) is oriented toward the bottom end of the connecting cavity (301), and one end of the piston rod (7) can extend into the connecting cavity (301) and push the bottom end of the connecting cavity (301).

13. The brake master cylinder according to claim 12, characterized in that: The inner wall of the connecting cavity (301) is provided with a clamping groove (302), and the limiting seat (6) is clamped and fixed to the clamping groove (302).

14. The brake master cylinder according to claim 11, characterized in that: Also includes: A cylinder cover (2), the cylinder cover (2) is connected and assembled with the cylinder barrel (1), and the cylinder cover (2) can limit the movement stroke of the piston (3).

15. A brake assembly, characterized in that: Comprising a brake master cylinder according to any one of claims 10-14.

16. A vehicle, characterized in that: Comprising a brake assembly according to claim 15.

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