Compact Master Cylinder with Single Gasket for Hydraulic Disk Brake
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Solution Overview
Problem
Existing master cylinders for hydraulic disk brakes have a relatively elongated design due to the need for both primary and secondary gaskets, leading to a large and heavy structure, which increases installation space and distance between the handlebar and the brake lever's pivot point, especially in radial mountings.
Innovation Solution
A compact master cylinder design where a single gasket performs the functions of both primary and secondary gaskets, sealing the pressure and compensating chambers, and sealing against the environment, eliminating the need for a secondary gasket area and allowing for a shorter structure along the cylinder axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both primary gasket and secondary gasket are provided in the master cylinder, then the sealing function is improved, but the axial length and installation space increase
Solution Approach 1:
The patent combines the functions of the primary gasket and secondary gasket into a single integrated gasket structure. This single gasket performs both the sealing function against the environment and the connection interruption function between the pressure chamber and compensating chamber, thereby eliminating the need for a second gasket and reducing the axial length of the master cylinder.
Solution Approach 2:
The single gasket is designed to perform multiple functions simultaneously: it seals the pressure chamber and compensating chamber against the environment (original secondary gasket function), and it interrupts the connection between the pressure chamber and compensating chamber when the piston moves (original primary gasket function). This multi-functionality resolves the contradiction by eliminating redundant components.
2Reliability
If both primary gasket and secondary gasket are provided in the master cylinder, then the sealing function is improved, but the weight increases
Solution Approach 1:
The patent merges the primary gasket and secondary gasket into a single integrated gasket structure. This consolidation eliminates the weight of one gasket while maintaining both sealing functions through the multi-functional design of the single gasket.
Solution Approach 2:
The single gasket is designed to perform multiple sealing functions simultaneously, replacing two separate gaskets with one component that has equivalent or superior sealing capability, thereby reducing the overall weight of the master cylinder assembly.
3Reliability
If the master cylinder has an elongated design with both gaskets, then the sealing reliability is improved, but the installation space and distance from handlebar to pivot point increase
Solution Approach 1:
The patent combines both gasket functions into a single integrated component, which eliminates the axial space required for two separate gaskets and their mounting structures. This reduces the overall installation space of the master cylinder while maintaining sealing reliability through the multi-functional design.
Solution Approach 2:
The single gasket performs multiple sealing functions that were previously distributed across two separate gaskets, thereby consolidating the sealing system into a more compact configuration that requires less installation space while maintaining equivalent or improved sealing reliability.
Data Source
AI summary
A master cylinder for a hydraulic brake comprises a compensating chamber, a cylinder in which a piston is movably disposed, a pressure chamber disposed in the cylinder and connected to the compensating chamber through at least one connecting opening, and a gasket for interrupting the connection between the pressure chamber and the compensating chamber. The gasket seals the compensating chamber and the pressure chamber against the environment.