A sub-piston assembly, a master brake cylinder and a vehicle

Abstract

The present invention relates to a sub-piston assembly of a vehicle brake master cylinder. The sub-piston assembly is driven by a main piston assembly and is connected in series with the main piston assembly in a cylinder block. The sub-piston assembly includes: a piston body formed in a hollow shape with one end being an open end and the other end being a closed end, and the main piston assembly is connected to the outer bottom surface of the closed end to drive the sub-piston assembly; and an elastomer with one end disposed on the inner bottom surface of the closed end and the other end extending out of the piston body to be connected to the inner bottom surface of the cylinder block. Among them, a plurality of protruding structures axially extending to support the elastomer are provided on the inner side wall of the piston body. The sub-piston assembly provided by the present invention not only has a simple structure and is convenient for assembly, but also can save costs, thereby solving the problems of the existing sub-piston assembly being heavy in weight and high in cost.

Description

Technical Field

[0001] The present invention relates to the field of vehicle components, and particularly to a secondary piston assembly, a brake master cylinder including the same, and a vehicle. Background Art

[0002] Generally, in the braking unit of a vehicle, when a driver steps on the brake pedal, the brake master cylinder of the vehicle receives the pedal force and converts it into hydraulic pressure, and then transmits the converted hydraulic pressure to the wheel cylinders of each wheel to generate braking force.

[0003] As Figure 1 shown, in the existing design, the structure of the brake master cylinder of a vehicle includes: a cylinder block 100; a primary piston assembly 110 and a secondary piston assembly 120. When the driver steps on the brake pedal, the primary piston assembly 110 compresses towards the inside of the cylinder block, and indirectly compresses the secondary piston assembly 120 connected to the primary piston assembly 110, thereby generating hydraulic pressure.

[0004] Among them, as Figure 2 shown, the secondary piston assembly 120 includes a piston body 121 and a helical spring 122. Among them, a telescopic rod is arranged inside the helical spring 122 to support and guide the expansion and contraction of the helical spring 122, and the telescopic rod is composed of a spring retainer 123 and a piston body 121 that are snap-connected through a gasket 124.

[0005] The secondary piston assembly 120 of the existing brake master cylinder realizes its functions through the above-mentioned various structures. However, the existing secondary piston assembly 120 has disadvantages such as complex structure, heavy weight, and high cost. Therefore, a secondary piston assembly with a simple structure, capable of saving costs and reducing weight is needed. Summary of the Invention

[0006] (1) Technical Problems to be Solved

[0007] An object of the present invention is to provide a secondary piston assembly to solve the problems of complex structure, heavy weight, and excessive cost of the existing secondary piston assembly.

[0008] Another object of the present invention is to provide a brake master cylinder and a vehicle including the above-mentioned secondary piston assembly to solve the problems of complex structure, heavy weight, and excessive cost of the existing secondary piston assembly.

[0009] (2) Technical Solutions

[0010] To solve the above technical problems, on the one hand, the present invention provides an auxiliary piston assembly for a vehicle brake master cylinder. The auxiliary piston assembly is driven by a main piston assembly and is connected in series with the main piston assembly in the cylinder block. The auxiliary piston assembly includes: a piston body, formed in a hollow shape with one end being an open end and the other end being a closed end, and the main piston assembly is connected to the outer bottom surface of the closed end to drive the auxiliary piston assembly; and an elastomer, with one end disposed on the inner bottom surface of the closed end and the other end extending out of the piston body to be connected to the inner bottom surface of the cylinder block. Among them, a plurality of protruding structures axially extending to support the elastomer are provided on the inner side wall of the piston body.

[0011] Optionally, the elastomer includes a helical spring.

[0012] Optionally, the plurality of protruding structures are in interference fit with the elastomer.

[0013] Optionally, the plurality of protruding structures are evenly distributed axially along the inner side wall of the piston body.

[0014] Optionally, the number of the protruding structures is 3.

[0015] Optionally, the length of the protruding structure is less than the length of the piston body.

[0016] On the other hand, the present invention also provides a brake master cylinder, which includes the above-mentioned auxiliary piston assembly.

[0017] On yet another hand, the present invention also provides a vehicle, which includes the above-mentioned brake master cylinder.

[0018] (III) Beneficial Effects

[0019] Compared with the prior art, the present invention has the following advantages: The present invention provides an auxiliary piston assembly for a vehicle brake master cylinder. The auxiliary piston assembly is driven by a main piston assembly and is connected in series with the main piston assembly in the cylinder block. The auxiliary piston assembly includes: a piston body, formed in a hollow shape with one end being an open end and the other end being a closed end, and the main piston assembly is connected to the outer bottom surface of the closed end to drive the auxiliary piston assembly; and an elastomer, with one end disposed on the inner bottom surface of the closed end and the other end extending out of the piston body to be connected to the inner bottom surface of the cylinder block. Among them, a plurality of protruding structures axially extending to support the elastomer are provided on the inner side wall of the piston body. The auxiliary piston assembly provided by the present invention is not only simple in structure and convenient for assembly, but also can save costs, thus solving the problems of the existing auxiliary piston assembly being heavy in weight and high in cost. Description of the Drawings

[0020] Combined with the drawings, from the following detailed description, the above and other objects, features and other advantages of the present disclosure will be more clearly understood, where:

[0021] Figure 1 is a schematic structural diagram showing a brake master cylinder according to the prior art;

[0022] Figure 2 is a schematic structural view showing a sub-piston assembly according to the prior art;

[0023] Figure 3 is a schematic structural view showing a sub-piston assembly according to an embodiment of the present invention;

[0024] Figure 4 is a sectional view showing a sub-piston assembly according to an embodiment of the present invention.

[0025] In the figure: 100: cylinder block; 110: main piston assembly; 120: sub-piston assembly; 121, 221: piston body; 122: helical spring; 123: spring retainer; 124: gasket; 222: elastomer; 223: protruding structure. Detailed Embodiments

[0026] The following will further describe in detail the specific embodiments of the present invention in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0027] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0029] In addition, in the description of the present invention, unless otherwise stated, the meanings of "a plurality of", "multiple roots", "multiple groups" are two or more.

[0030] The present invention provides a secondary piston assembly for a vehicle brake master cylinder, which includes a piston body 221 and an elastic body 222, and the secondary piston assembly is located inside the brake master cylinder, driven by the primary piston assembly and connected in series with the primary piston assembly in the cylinder body of the brake master cylinder.

[0031] Specifically, as Figure 3 and Figure 4 shown, the secondary piston assembly of this embodiment includes: a piston body 221, formed in a hollow shape with one end being an open end and the other end being a closed end. Among them, the outer bottom surface of the closed end of the secondary piston assembly is connected to the primary piston assembly, so that the primary piston assembly can drive the secondary piston assembly to perform axial telescopic movement; an elastic body 222, one end of which is arranged on the inner bottom surface of the closed end of the piston body 221, and the other end extends out of the piston body 221 and is connected to the inner bottom surface of the cylinder body of the brake master cylinder. Optionally, the elastic body 222 can be a helical spring.

[0032] A plurality of protruding structures 223 are arranged on the inner side wall of the piston body 221 of this embodiment, which axially extend on the inner side wall of the piston body 221, and their length is less than the length of the piston body 221.

[0033] Specifically, the protruding structure 223 on the inner side wall of the piston body 221 is used to support the elastic body 222, and the protruding structure 223 is in interference fit with the elastic body 222, so that while firmly supporting the elastic body 222, it can guide the elastic body 222 to elastically deform stably along the axis, and further enable the normal movement of the secondary piston assembly.

[0034] According to the embodiment of the present invention, a plurality of protruding structures 223 are formed along the axis of the inner side wall of the piston body 221 and are evenly spaced on the inner side wall of the piston body 221, so that the supported elastic body 222 is evenly stressed and can expand and contract more stably along the axis. Preferably, the number of protruding structures 223 formed at the same interval can be 3.

[0035] On the other hand, the present invention also provides a brake master cylinder, which includes the secondary piston assembly as described above. While simplifying the structure and making it easy to assemble, it can also reduce the weight and save costs.

[0036] On yet another aspect, the present invention also provides a vehicle, which includes the secondary piston assembly as described above. While simplifying the structure and making it easy to assemble, it can also reduce the weight and save costs.

[0037] In summary, compared with the prior art, the present invention has the following advantages: The present invention provides a sub-piston assembly for a vehicle brake master cylinder. The sub-piston assembly is driven by a main piston assembly and is connected in series with the main piston assembly in the cylinder block. The sub-piston assembly includes: a piston body formed in a hollow shape with one end being an open end and the other end being a closed end, and the main piston assembly is connected to the outer bottom surface of the closed end to drive the sub-piston assembly; and an elastomer with one end disposed on the inner bottom surface of the closed end and the other end extending out of the piston body to be connected to the inner bottom surface of the cylinder block. Among them, a plurality of protruding structures axially extending are provided on the inner side wall of the piston body to support the elastomer. The sub-piston assembly provided by the present invention is not only simple in structure and convenient for assembly, but also can save costs, thereby solving the problems of the existing sub-piston assembly being heavy in weight and high in cost.

[0038] The foregoing are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A secondary piston assembly for a vehicle brake master cylinder, the secondary piston assembly being driven by a primary piston assembly and connected in series with the primary piston assembly in a cylinder block, the secondary piston assembly comprising: A piston body, formed in a hollow shape with one end being an open end and the other end being a closed end, the primary piston assembly being connected to the outer bottom surface of the closed end to drive the secondary piston assembly; And An elastomer, with one end disposed on the inner bottom surface of the closed end and the other end extending out of the piston body to be connected to the inner bottom surface of the cylinder block, Wherein, on the inner side wall of the piston body, there are provided a plurality of protruding structures extending axially to support the elastomer, Wherein, the plurality of protruding structures are evenly spaced along the perimeter of the inner side wall of the piston body, Wherein, the elastomer is a helical spring.

2. The secondary piston assembly according to claim 1, wherein: The plurality of protruding structures are in interference fit with the elastomer.

3. The secondary piston assembly according to claim 2, wherein: The number of the protruding structures is 3.

4. The secondary piston assembly according to claim 3, wherein: The length of the protruding structure is less than the length of the piston body.

5. A master cylinder for braking, characterized in that, Comprising the secondary piston assembly according to any one of claims 1 to 4.

6. A vehicle, characterized in that, Comprising the brake master cylinder according to claim 5.

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