Master Cylinder Protecting Member Limits Piston Backward Movement
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Solution Overview
Problem
Overhang-type master cylinders require a separate stopper to limit piston backward movement, complicating the structure and assembly due to the stretching of rubber covers when filled with brake fluid, which can lead to piston damage.
Innovation Solution
A protecting member comprising a first and second cover member that slidably engage to extend and contract, with a restricting mechanism to prevent backward piston movement, eliminating the need for a separate stopper and simplifying the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a rubber cover is used to protect the exposed piston portion, then the piston is protected from damage during shipping and mounting, but the piston may exceed the backward movement limit due to rubber cover stretching when filled with brake fluid, requiring an additional stopper that complicates the structure
Solution Approach 1:
The protecting member combines two separate functions into a single integrated component: (1) the protective cover function that shields the exposed piston portion from damage during shipping and mounting, and (2) the stopper function that limits backward piston movement through its rigid body structure. This merging eliminates the need for separate rubber covers and stoppers, resolving the technical contradiction by maintaining protection while avoiding the complexity of additional components.
Solution Approach 2:
The protecting member serves multiple functions simultaneously: it acts as a protective cover for the piston, a stopper to limit backward movement, and a structural support element. This multi-functionality allows a single component to address both the protection need and the movement limitation need without requiring separate specialized parts, thereby simplifying the overall master cylinder structure.
2Reliability
If a separate stopper is added to limit piston backward movement, then the piston movement is controlled, but the structure becomes complicated and assemblage becomes unfavorable
Solution Approach 1:
The stopper function is merged with the protective cover function in the single protecting member. The rigid body structure of the protecting member inherently provides the stopper function by contacting the piston to limit backward movement, while simultaneously serving as the protective cover. This integration eliminates the need for separate stopper components and reduces assembly steps.
Solution Approach 2:
The protecting member is designed as a multi-functional component that performs both protection and movement control. By making the protecting member universal in its functions, the design eliminates the need for specialized separate components, thereby maintaining reliability through proper piston movement control while simplifying the overall structure and assemblage process.
3Device complexity
If a rigid protecting member is used to limit piston movement, then the structure is simplified, but the protecting member must be removed for mounting which reduces assembly efficiency
Solution Approach 1:
The protecting member is designed with preliminary detachable features that allow it to be easily removed before mounting the master cylinder on the booster. The detachable design enables workers to remove the protecting member as a preliminary step before final assembly, and the protecting member can be discarded after use. This preliminary action approach maintains the structural simplicity of the rigid protecting member while improving assembly efficiency by facilitating easy removal.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The protecting member effectively limits piston backward movement, preventing damage and simplifying assembly by integrating the stopping function within the master cylinder's design, ensuring efficient operation and mounting without removing the protecting member.
Implementation Method 1
said one side of the second cover member is slidably engaged with said another side of the first cover member
Implementation Method 2
the protecting member having a restricting member for preventing the second cover member from being removed from the first cover member and for limiting a backward movement of the piston relative to the cylinder body
Data Source
AI summary
A master cylinder including a cylinder body having a tubular shape with a closed end; and a piston having one side slidably inserted into the cylinder body and another side that projects from the cylinder body. The piston and the cylinder body define a pressure chamber for generating hydraulic pressure. The master cylinder also includes a protecting member for covering the side of the piston projects from the cylinder body. The protecting member is adapted to extend and contract, and limit backward movement of the piston.