Brake Pad Retraction Spring Geometry for Uniform Wear Control
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Solution Overview
Problem
Existing brake assembly designs face challenges in efficiently retracting brake pad assemblies due to uneven force distribution and potential tilting, leading to uneven wear and potential damage.
Innovation Solution
The brake assembly incorporates a retraction spring with angled biasing arms and tips that engage with backplates, providing uniform biasing forces to maintain parallel alignment and concentrate retraction force at the bottom, where friction is greatest, and includes specific engagement interfaces on the backplates to secure the spring and prevent rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a retraction spring is used to retract brake pad assemblies, then the brake pads can be pulled back after braking, but uneven force distribution causes uneven wear and potential damage
Solution Approach 1:
The retraction spring employs angled biasing arms with different angles (first angle and second angle) to create non-uniform force distribution patterns that are specifically designed to counteract the uneven wear tendencies of brake pads. The spring exerts different magnitudes of force on different brake pad assemblies based on their specific wear conditions and positional requirements, rather than applying uniform force to all pads equally.
2Reliability
If a retraction spring is used to retract brake pad assemblies, then the brake pads can be pulled back after braking, but the brake pads may tilt during retraction
Solution Approach 1:
The retraction spring functions as a counterbalancing mechanism that applies forces specifically designed to offset the tilting moments experienced by brake pad assemblies during retraction. The angled biasing arms generate counteracting forces that balance the gravitational and frictional forces causing tilt, thereby maintaining the parallel alignment of brake pads with the rotor throughout the retraction process.
3Reliability
If the retraction spring is not properly constrained, then the spring may rotate and fail to provide effective retraction force
Solution Approach 1:
The engagement interface between the retraction spring and brake pad assemblies employs asymmetric geometric features including non-circular cross-sections of the biasing arms and corresponding asymmetric receptacles or engagement surfaces on the brake pad assemblies. This asymmetric design creates a mechanically interlocking relationship that prevents rotational movement of the spring while it applies retraction force, ensuring the force is applied in the correct directional orientation without requiring additional complex constraint 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
This configuration improves brake pad assembly retraction by ensuring uniform force distribution and maintaining parallel alignment, reducing uneven wear and preventing damage by focusing retraction force effectively and inhibiting spring rotation.
Implementation Method 1
a retraction spring. The retraction spring may be configured to improve brake pad assembly retraction
Data Source
AI summary
A brake pad retraction spring that includes a coil, first and second biasing arms, and first and second biasing tips. The first and second biasing arms may extend from the center coil. The first and second biasing tips may extend from ends of the first and second biasing arms, respectively.