Disc Brake Anti-Rotation Member for One-Way Piston Locking
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Solution Overview
Problem
The existing disc brake assemblies face manufacturing complexity and efficiency issues due to alignment requirements for anti-rotation members, leading to potential damage, wear, and noise during the parking brake function, especially when the brake piston spins without sufficient friction.
Innovation Solution
An anti-rotation member with a stop surface and a diversion surface is designed to prevent rotation in one direction while allowing it in another, deflecting towards the brake shoe when engaged, and biased away by a spring force, reducing the need for precise alignment and minimizing damage and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional pip anti-rotation member is used with a recessed area requiring precise alignment, then rotation of the brake piston can be prevented, but manufacturing complexity increases and assembly efficiency decreases
Solution Approach 1:
The anti-rotation member features an asymmetric design with a flat surface on one side and a rounded surface on the opposing side. The flat surface engages with a corresponding flat recessed area in the brake piston to prevent rotation in one direction, while the rounded surface allows rotation in the opposite direction. This asymmetric geometry eliminates the need for precise alignment during manufacturing while effectively preventing unwanted brake piston rotation during normal operation.
2Ease of operation
If the brake piston is allowed to spin during servicing when the spindle contacts the spindle stop, then the servicing operation can be completed, but damage to the spindle may occur
Solution Approach 1:
The anti-rotation member is designed to allow rotation in the reverse direction (opposite to normal braking operation) when the brake piston encounters the spindle stop during servicing. The rounded surface of the anti-rotation member permits controlled rotation that prevents the brake piston from striking the pip, thereby avoiding spindle damage while still completing the servicing operation.
3Productivity
If precise alignment between the pip and recessed area is not achieved during manufacturing, then manufacturing efficiency improves, but caliper drag, noise, and premature wear may result
Solution Approach 1:
The asymmetric design with flat and rounded surfaces allows the anti-rotation member to engage the brake piston in a direction-dependent manner. The flat surface provides positive engagement to prevent rotation and harmful effects during normal operation, while the rounded surface provides tolerance for misalignment during manufacturing, eliminating the need for precise alignment procedures.
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 design enhances manufacturing efficiency and reduces wear and damage by allowing for more flexible assembly and operation, ensuring effective brake function without alignment-dependent issues.
Implementation Method 1
biased away by a spring force
Implementation Method 2
friction between the end face and the brake shoe is insufficient to resist the torque
Data Source
AI summary
A disc brake assembly includes a brake shoe, an anti-rotation member extending outward from the brake shoe, a displaceable brake piston that supports the brake shoe, an end face of the brake piston, and a recessed area in the end face. The brake shoe is displaceable along an axis. The end face is perpendicular to the axis and faces the brake shoe. The anti-rotation member has a stop surface and a diversion surface. The recessed area engages the stop surface to stop rotation of the brake piston in a first direction and the recessed area engages the diversion surface to allow rotation of the brake piston in a second direction. The first and second directions are opposite.