A new type of fixed spring piston component

Abstract

This utility model relates to a novel piston component for fixing a spring, belonging to the technical field of automotive braking systems. A small clearance fit exists between the spring limiting seat and the spring limiting rod, while the spring limiting rod is interference-fitted with the piston. A chip accumulation groove is provided at the interference fit between the spring limiting rod and the piston. The advantages are its novel structure; the interference fit between the spring limiting rod and the piston ensures stable movement of the spring limiting seat along the spring limiting rod when the spring is compressed; after riveting, the axial limiting surface of the piston stabilizes the axial dimension; the chip accumulation groove at the interference fit between the spring limiting rod and the piston prevents aluminum chips from leaking out; and the head of the spring limiting rod is designed with a guide structure to facilitate assembly of the spring limiting rod and the piston, solving the problems of difficult size control and impurity control in current piston components.

Description

Technical Field

[0001] This utility model belongs to the field of automotive braking system technology, and in particular refers to the piston component structure inside the brake master cylinder assembly, which is a novel piston component with a fixed spring. Background Technology

[0002] The piston assembly is a key component of the automotive brake master cylinder assembly. Its main function is to form a seal between the outer diameter of the piston assembly and the inner lip of the piston cup when the brake pedal moves forward, thereby creating a pressure chamber inside the master cylinder and generating braking force. When the pedal returns to its original position, the piston returns to its initial assembly position under the action of pressure and piston spring resistance, thereby releasing the braking force.

[0003] The piston assembly structure with spring has various axial limiting methods for the spring. See the sectional view of a conventional piston assembly for details. Figure 5 The specific components include: spring 1, spring limit seat 2, small washer 9, and piston 10. The assembly relationship between the parts is as follows: spring 1 and spring limit seat 2 are installed on the middle limit rod of piston 10; then the small washer 9 is installed on the front end of the limit rod of piston 10; finally, the front end of the limit rod of piston 10 is riveted (the dotted line portion is riveted). See details... Figure 6 After being riveted together, they form a piston assembly. The disadvantages of this type of riveted piston assembly are: the axial limiting dimension is affected by the size of the riveting point; aluminum shavings are generated after riveting the limiting rod in the middle of the piston; and the riveted assembly requires dust removal. Therefore, this type of piston assembly is more difficult to control in terms of size and impurities. Summary of the Invention

[0004] This invention provides a novel piston component with a fixed spring, which solves the problems of difficulty in size control and impurity control in the current piston component structure.

[0005] The technical solution adopted by this utility model includes a spring, a spring limiting seat, a spring limiting rod, and a piston, wherein the spring limiting seat and the spring limiting rod are fitted with a small clearance, and the spring limiting rod is fitted with the piston with an interference fit.

[0006] The spring limit rod and the piston interference fit have a chip accumulation groove.

[0007] The piston has an axial limiting surface for assembling a spring limiting rod.

[0008] The spring limiting rod has a guide position that is assembled with the piston.

[0009] The advantages of this utility model are its novel structure. The spring limiting rod and the piston are interference-fitted. When the spring is compressed, it ensures that the spring limiting seat moves stably along the spring limiting rod. After riveting, the axial limiting surface of the piston stabilizes the axial dimension. A chip accumulation groove is designed at the interference fit between the spring limiting rod and the piston to prevent aluminum chips from leaking out. The head of the spring limiting rod is designed with a guide structure to facilitate the assembly of the spring limiting rod and the piston. This solves the problems of difficult size control and impurity control in the piston components of the current structure. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 yes Figure 1 Enlarged view of Part I; Figure 3 This is a schematic diagram of the piston structure of this utility model; Figure 4 This is a schematic diagram of the structure of the spring limiting rod of this utility model; Figure 5 This is a cross-sectional view of a conventional piston component; Figure 6 yes Figure 5 Enlarged view of part K. Detailed Implementation

[0011] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0012] like Figure 1 As shown, it includes a spring 1, a spring limiting seat 2, a spring limiting rod 3, and a piston 4. The spring limiting seat 2 and the spring limiting rod 3 are fitted with a small clearance. When the spring 1 is compressed, it ensures that the spring limiting seat 2 moves stably along the spring limiting rod 3. The spring limiting rod 3 is interference-fitted with the piston 4. The interference fit between the two parts can better ensure the coaxiality of the spring limiting rod 3 and the piston 4.

[0013] like Figure 2 As shown, there is a chip accumulation groove 5 at the interference fit between the spring limiting rod 3 and the piston 4. The main function of the chip accumulation groove 5 is to store the aluminum chips generated by the interference fit 6. The structure of this chip accumulation groove 5 can prevent aluminum chips from leaking out and contaminating the entire assembly environment and piston components.

[0014] like Figure 3 As shown, the piston 4 has an axial limiting surface 7 for assembling the spring limiting rod 3.

[0015] like Figure 4As shown, the spring limiting rod 3 has a guide position 8 that is assembled with the piston 4, which is designed to facilitate interference fit.

[0016] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the scope of protection of the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, any equivalent substitutions or modifications made by those skilled in the art based on the technical solution and the inventive concept of the present invention within the scope of the technical concept disclosed in the present invention shall all fall within the scope of protection of the present invention.

Claims

1. A novel piston component for fixing a spring, characterized in that... It includes a spring, a spring limiting seat, a spring limiting rod, and a piston, wherein the spring limiting seat and the spring limiting rod are fitted with a small clearance, and the spring limiting rod is fitted with the piston with an interference fit; the interference fit between the spring limiting rod and the piston has a chip accumulation groove.

2. The novel piston component for fixing a spring according to claim 1, characterized in that... The piston has an axial limiting surface for assembling the spring limiting rod.

3. The novel piston component for fixing a spring according to claim 1, characterized in that... The spring limiting rod has a guide position that is assembled with the piston.

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