Rear Brake Caliper Piston Retractor for Push-and-Twist Retraction
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Solution Overview
Problem
Existing tools for retracting pistons in disc brake caliper housings require significant manual effort and lack mechanical advantage, especially for rear brake systems with high-helix internal threads and varying detent patterns, making the process cumbersome and inefficient.
Innovation Solution
A disc brake piston retractor tool featuring centering cones for various piston sizes, a spring-loaded distal pusher portion, and a male threaded thrust bolt with a spreader plate, allowing for both pushing and rotating forces to be applied to the piston, facilitating its retraction into the caliper housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If traditional manual piston retraction tools are used, then the tool structure is simple, but significant manual effort is required and mechanical advantage is lacking
Solution Approach 1:
The patent employs periodic action through the ratchet mechanism that converts rotational motion into linear reciprocating motion. The ratchet allows the piston to be pushed inward during the forward stroke while preventing backward movement, creating a periodic pushing action that gradually retracts the piston without requiring continuous manual force
Solution Approach 2:
The patent utilizes hydraulic principles by introducing fluid into the caliper housing to apply pressure to the piston. This hydraulic pressure provides mechanical advantage, enabling the piston to be retracted with significantly less manual effort compared to direct mechanical pushing
2Ease of operation
If rear brake pistons with high-helix internal threads are retracted, then the parking brake function is maintained, but the piston requires both pushing inward and twisting to retract
Solution Approach 1:
The ratchet mechanism creates periodic pushing action that works in conjunction with the rotational movement required for high-helix threaded pistons. The periodic forward pushes combined with rotational twisting enable the piston to overcome the helical thread resistance and retract smoothly
Solution Approach 2:
The ratchet mechanism acts as an intermediary that converts rotational input into linear pushing force. This intermediary mechanism facilitates the complex interaction between rotational twisting and linear pushing required for retracting high-helix threaded pistons while maintaining ease of operation
3Adaptability or versatility
If multiple adaptors are provided for different detent patterns, then various piston configurations can be accommodated, but the operator must search and choose from many adaptors
Solution Approach 1:
The patent achieves universality by designing a single multi-functional tool that can accommodate various piston configurations. The tool integrates multiple functions including pushing, rotating, and adapting to different detent patterns within one device, eliminating the need to select from multiple separate adaptors
4Reliability
If brake pads are replaced after continuous wear, then the braking force is maintained, but the piston gradually travels outwardly reducing accommodation space
Solution Approach 1:
The patent applies preliminary action by fully retracting the piston before installing new brake pads. This preliminary retraction creates sufficient accommodation space for the new, thicker brake pads, ensuring proper installation and maintaining reliable braking force without interference from the caliper housing
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 housing designs, thereby simplifying the brake pad replacement process.
Implementation Method 1
A spring loaded distal pusher portion of said tool receives the centering cone
Implementation Method 2
The tool provides improved mechanical advantage and ease of use in retracting pistons
Implementation Method 3
The male threaded thrust bolt carries the spring loaded distal pusher portion
Data Source
AI summary
A tool for retracting pistons into cylinder bores is disclosed. A plurality of centering cones are provided to engage with a multitude of piston sizes and configurations. A user selects an appropriately sized centering cone and engages the selected centering cone with a spring loaded distal pusher portion of said tool. A female threaded collar and spreader plate combination receives a male threaded thrust bolt. The male threaded thrust bolt carries the spring loaded distal pusher portion. The spreader plate is pressed against a face of the caliper assembly, and rotation of the male threaded thrust bolt by a driver, such as a ratchet wrench or impact gun, applies inward and rotating forces from the spring loaded distal pusher portion of said tool to the piston, while separating the spring loaded distal pusher portion of said tool from the spreader plate.