Convex Piston Cap for Uniform Brake Pressure Plate Loading
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Solution Overview
Problem
Existing brake systems experience stress concentration and wear on pressure plates due to non-uniform force transmission from piston caps, leading to premature damage and reduced operational life during braking operations.
Innovation Solution
A piston cap design with a convex surface that reduces its curvature upon compression, distributing the force more evenly across the pressure plate, thereby reducing stress concentrations and preventing buckling, which helps in prolonging the life of brake system components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional piston cap with a flat or non-deforming surface is used, then the structure is simple and easy to manufacture, but stress concentration occurs on the pressure plate leading to premature wear and damage
Solution Approach 1:
The piston cap incorporates a convex surface with a defined radius of curvature on its cap face. This curved geometry is specifically designed to deform under compression, transforming the rigid flat surface into a compliant contact interface that distributes stress more uniformly across the pressure plate, thereby preventing stress concentration and extending component life.
Solution Approach 2:
The piston cap is designed to change its geometric parameters dynamically under load. The convex surface's radius of curvature decreases as the cap compresses against the pressure plate, allowing the contact area to expand and stress distribution to improve. This parameter change enables the piston cap to adapt its mechanical properties during operation without requiring complex active control systems.
2Reliability
If the piston cap is designed to deform under compression to distribute force evenly, then stress concentration is reduced, but the manufacturing precision requirements increase due to the convex surface geometry
Solution Approach 1:
The convex surface is designed with a specific radius of curvature that balances manufacturability with functional performance. This curved geometry can be produced using standard forming and machining processes, avoiding the need for extremely tight tolerances while still achieving the desired stress distribution effect when the cap deforms under compression.
3Stress or pressure
If a rigid piston cap is used, then the structure is simple and durable, but non-uniform force transmission causes stress concentration and premature damage to the pressure plate
Solution Approach 1:
The convex surface geometry transforms the rigid piston cap into a component that exhibits controlled compliance under load. The curved surface deforms elastically when compressed, creating a more uniform pressure distribution across the pressure plate contact surface. This simple geometric modification eliminates stress concentration without requiring complex multi-component designs or active control mechanisms.
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 piston cap effectively distributes the compression force, reducing stress concentrations on the pressure plate and preventing premature wear, thus extending the operational life of the brake system components.
Implementation Method 1
the convex surface is configured to reduce the curvature when the piston body compresses the cap face against the contact surface
Data Source
AI summary
In some examples, a brake system includes a piston configured to cause a compression of a disc stack. The piston includes a piston body configured to compress a cap face of a piston cap against a pressure plate to cause the compression of the disc stack. The cap face may define a convex surface. The piston cap may be configured such that the convex surface reduces it curvature when the cap face is compressed against the pressure plate. In examples, the piston cap is configured to elastically deform to cause the cap face to reduce the curvature when the cap face is compressed against the pressure plate.