Caliper Brake Piston Support Structure for Seal Durability
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Solution Overview
Problem
The caliper brake's piston seal, made of elastic material, is prone to deformation due to the weight of the piston, leading to reduced durability and incomplete elastic restoring force.
Innovation Solution
A support member is introduced between the cylinder and piston, positioned adjacent to the piston's center of gravity, to minimize external forces and prevent deformation, with options including an annular shape, rib form, or a combination of both, to ensure full elastic restoring force and improved durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the piston seal is positioned away from the center of gravity of the piston to seal the space between the piston and cylinder, then the sealing function is improved, but the piston seal is continuously subjected to external force from the piston weight causing deformation and reduced durability
Solution Approach 1:
A support member is introduced as an intermediary element between the piston and cylinder. This support member carries the piston weight and transfers it to the cylinder, preventing the piston seal from being continuously subjected to the external force of the piston weight, thereby reducing deformation and improving durability while maintaining the sealing function
2Ease of operation
If the piston seal is made of elastic material to provide elastic restoring force to the piston, then the piston return function is improved, but the elastic material's weak durability causes easy deformation under continuous external force
Solution Approach 1:
The support member acts as a mediator that bears the piston weight, allowing the elastic piston seal to maintain its elasticity and provide full restoring force without being continuously deformed by the heavy external load, thus preserving both the piston return function and durability
3Reliability
If the piston seal is positioned close to the pad plate to restrict brake fluid flow, then the fluid sealing is improved, but the seal is subjected to continuous external force from piston weight at a distance from center of gravity causing deformation
Solution Approach 1:
The support member serves as a mediator that supports the piston weight near the center of gravity, preventing the piston seal from being continuously deformed by the external force, thereby maintaining both fluid sealing effectiveness and shape stability
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 support member effectively reduces deformation of the seal member, allowing it to provide a full elastic restoring force and enhancing the caliper brake's durability and market competitiveness.
Implementation Method 1
the piston seal is made of an elastic material. The piston seal provides an elastic restoring force to the piston to help the piston to return to its original position after completion of movement
Implementation Method 2
an external force of the same direction and magnitude, which is generated by a weight of the piston, is continuously applied to the piston seal
Data Source
AI summary
The caliper brake includes a carrier on which a pair of pad plates are installed to be able to move forward to and backward from a disc, a caliper housing slidably installed on the carrier and provided with a cylinder, a piston installed in the cylinder and provided to be able to move forward to and backward from the pair of pad plates, a seal groove formed to be recessed in an inner surface of the cylinder, a seal member accommodated in the seal groove to be in close contact with an outer surface of the piston, and a support member interposed between the inner surface of the cylinder and the outer surface of the piston and disposed adjacent to a center of gravity of the piston.