Articulating Brake Piston Cap for Jamming Prevention
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Solution Overview
Problem
Brake pistons often jam or cock due to uneven brake pad wear, leading to noise, vibration, and harshness (NVH) issues, and manufacturing tolerances can cause alignment problems, resulting in premature wear and jamming.
Innovation Solution
A brake piston design featuring a body and cap with a pivot joint, allowing the cap to move relative to the body, accommodating uneven wear and manufacturing tolerances, thus preventing contact with the piston bore and reducing the risk of jamming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tight tolerances are maintained for perpendicularity, flatness, and parallelism of the brake piston and piston bore, then the brake piston can prevent contact with the piston bore and avoid jamming, but manufacturing complexity and cost increase
Solution Approach 1:
The brake piston design incorporates a spherical element that allows the piston body to dynamically adjust its orientation relative to the piston bore. This dynamic adjustment capability enables the piston to accommodate variations in perpendicularity, flatness, and parallelism without requiring extremely tight manufacturing tolerances, thereby resolving the contradiction between reliability and manufacturing precision.
2Object-affected harmful factors
If the brake piston is designed to accommodate uneven brake pad wear through cap movement, then noise, vibration, and harshness issues are reduced, but device complexity increases
Solution Approach 1:
The brake piston is segmented into a piston body and a cap that can move independently relative to each other. This segmentation allows the cap to accommodate uneven brake pad wear while the body maintains proper alignment, reducing noise, vibration, and harshness without requiring complex overall device architecture.
Solution Approach 2:
The spherical element enables dynamic adjustment of the cap's position and orientation relative to the piston body. This dynamic capability allows the piston to self-adjust to uneven wear conditions, reducing harmful NVH effects without adding significant structural complexity.
Data Source
AI summary
A brake piston that includes a body and a cap. The cap is free to move or pivot relative to the body. The body is adapted to generally maintain axial alignment with a piston bore that is adapted to support the brake piston, and the cap is free to move or pivot relative to the body and the piston bore.