Reversible Brake Caliper Retractor Plates for Tight-Service Gaps
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Solution Overview
Problem
Existing tools for servicing disc brake pads require significant manual effort to retract pistons within caliper housings, lacking mechanical advantage and ease of use, especially when dealing with various caliper designs.
Innovation Solution
A disc brake piston retractor tool featuring reversible plates that can minimize or maximize the distance between them, allowing secure nesting within the caliper and easy operation via a ratchet handle, enabling efficient piston retraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional brake press tool is used to retract pistons, then the piston retraction function is achieved, but significant manual effort is required and mechanical advantage is lacking
Solution Approach 1:
The patent employs a hydraulic press mechanism where a plunger forces brake fluid through a check valve into the caliper cylinder, utilizing hydraulic pressure to automatically retract the piston. This replaces manual mechanical pressing with hydraulic force multiplication, significantly reducing the manual effort required while maintaining effective piston retraction capability.
2Reliability
If the tool is designed for a fixed caliper design, then the tool fits that specific caliper well, but it cannot accommodate various caliper housing designs
Solution Approach 1:
The patent designs the plates with reversible orientation and adjustable positioning capabilities, enabling a single tool to universally accommodate multiple caliper housing designs. The plates can be flipped and repositioned to match different caliper geometries, piston positions, and spacing requirements, making the tool multi-functional across various brake system configurations while maintaining secure fit through proper engagement surfaces.
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 tool provides improved mechanical advantage and ease of use in retracting pistons, reducing manual effort and accommodating different caliper designs, facilitating efficient brake pad replacement.
Implementation Method 1
A ratchet handle is provided for spreading the plates apart and for retracting the plates and the piston into the caliper
Data Source
AI summary
A tool for retracting pistons into cylinder bores is disclosed, with a narrow gap between facing pressure plates allowing use of the tool in tight places, and ratcheting spreading of the facing pressure plates causing outward moving of the pistons, enabling work to be performed. One of the pressure plates is reversible to change the minimum narrow gap from a first width to a second width. In each of the orientations, the plates are movable towards and away from one another.