Brake Caliper Piston Retractor With Threaded Ratchet Drive
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Solution Overview
Problem
Existing tools for servicing disc brake pads require significant manual effort to retract pistons due to a lack of mechanical advantage, making the process cumbersome and inefficient.
Innovation Solution
A disc brake piston retractor tool featuring a threaded stud and coupler mechanism, combined with a reversible ratchet wrench assembly, allows for simultaneous lateral movement of the stud and pressure plates, enabling easier retraction of pistons with improved mechanical advantage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If traditional manual tools are used to retract brake pistons, then the tool structure remains simple, but significant manual effort is required and mechanical advantage is insufficient
Solution Approach 1:
The patent employs a hydraulic press mechanism where a pump delivers hydraulic fluid to a cylinder, causing a piston to move and apply force to the brake caliper piston. This hydraulic system provides substantial mechanical advantage, reducing the manual effort required to retract brake pistons while maintaining a manageable tool structure through standardized hydraulic components.
2Force
If hydraulic equipment is used to retract brake pistons, then mechanical advantage is improved, but the tool size and portability are reduced
Solution Approach 1:
The hydraulic tool is divided into separate functional components: a handheld pump that can be operated independently, a cylinder assembly that interfaces with the brake caliper, and connecting hoses. This segmentation allows the high-force hydraulic mechanism to be delivered in manageable portions, improving portability while maintaining the mechanical advantage of hydraulic force multiplication.
Solution Approach 2:
The tool incorporates a ratchet mechanism that allows the piston to be retracted incrementally with each pump operation, maintaining pressure and position without requiring continuous force application. This dynamic operation enables efficient piston retraction while reducing the overall force requirements and tool size compared to systems requiring constant high force.
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 simplifies the process of retracting pistons, reducing manual effort and facilitating easier replacement of brake pads by allowing for efficient retraction and extension of the pistons within the caliper housing.
Implementation Method 1
Because of the particular threaded relationship between a threaded stud and a coupler, it should be understood that rotation of the coupler in clockwise or counterclockwise directions will result in simultaneous lateral movement of the threaded stud through the coupler.
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, wherein movement of a threaded stud through a coupler moves a first pressure plate.