Disc Brake Piston Retraction Tool with Hydraulic Advantage
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Solution Overview
Problem
Existing tools for servicing disc brake pads require significant manual effort to retract pistons in caliper housings, lacking mechanical advantage and ease of use, especially when dealing with various caliper designs.
Innovation Solution
A disc brake piston retractor tool comprising a first and second pressure plate, a coupler, and a reversible ratchet wrench assembly, allowing for simultaneous lateral movement of the pressure plates to retract pistons into the caliper cylinder, providing improved mechanical advantage and ease of use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual spreader and brake press tools are used to retract pistons, then piston retraction can be 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, using hydraulic pressure to automatically retract the piston. This eliminates the need for significant manual effort while maintaining effective piston retraction, directly resolving the contradiction between ease of operation and force requirement
Solution Approach 2:
The invention replaces traditional mechanical leverage systems (such as long-handled spreaders requiring manual cranking) with a hydraulic system that uses fluid pressure multiplication. The check valve and hydraulic fluid work together to convert small manual input force into large piston retraction force, substituting mechanical advantage with hydraulic advantage for improved ease of operation
2Adaptability or versatility
If traditional spreader tools are used to spread brake pads apart, then brake pad accommodation space is created, but the tools lack adaptability to various caliper housing designs
Solution Approach 1:
The patent designs a universal tool assembly that can accommodate various caliper housing types through adjustable components. The spreader mechanism includes adjustable arms and positioning features that can be configured to fit different caliper geometries, while the hydraulic press mechanism remains consistent across applications. This multi-functionality approach enables adaptability to various caliper designs without proportionally increasing overall tool complexity
Solution Approach 2:
The tool is divided into modular components including a reusable hydraulic press mechanism and interchangeable or adjustable spreader elements. This segmentation allows the core hydraulic system to remain simple while the adaptable spreader components can be modified or reconfigured for different caliper types, resolving the contradiction between adaptability and complexity
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
Enables efficient retraction of pistons with reduced manual effort, facilitating the replacement of brake pads by accommodating various caliper designs and ensuring proper piston positioning for effective brake pad installation.
Implementation Method 1
a reversible ratchet wrench assembly connected to the coupler
Implementation Method 2
providing improved mechanical advantage and ease of use
Implementation Method 3
allowing for simultaneous lateral movement of the pressure plates to retract pistons into the caliper cylinder
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.