Vehicle Piston Pusher with Ratchet-Driven Screw Mechanism
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Solution Overview
Problem
Conventional tools for pushing back brake caliper pistons during brake lining replacement are inadequate, leading to safety risks and potential piston damage due to insufficient strength, and existing hydraulic devices can overpower the piston, causing oil leakage.
Innovation Solution
A vehicle piston pusher with a rotation member driven by a direction switchable ratchet wrench, featuring a thread rod that adjusts the distance between a movable plate and the base to efficiently push the piston back into the bore, providing structural simplicity and convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a hydraulic device is used to push back the piston, then sufficient pushing force is provided, but the piston may be overpowered and damaged causing oil leakage
Solution Approach 1:
The patent changes the force delivery parameter from continuous hydraulic pressure to controlled mechanical force through a screw mechanism. The threaded rod converts rotational motion into linear motion, allowing gradual and controlled application of force to the piston, preventing overpowering while still achieving sufficient pushing force for piston retraction.
Solution Approach 2:
The patent replaces the hydraulic system with a purely mechanical screw-based system. The threaded rod and nut mechanism provides mechanical advantage through threading, delivering controlled force without the risk of hydraulic overpressure that could damage the piston or cause oil leakage.
2Ease of operation
If bare hands are used to install brake linings, then no tool is needed, but the user safety is at risk and the space is insufficient for operation
Solution Approach 1:
The device is designed to be self-operating through the screw mechanism. Once the threaded rod is engaged with the nut, turning the rod automatically translates into linear motion that pushes the piston back, eliminating the need for continuous manual force application or complex tool operations while maintaining user safety.
3Device complexity
If a simple mechanical tool is used to push the piston, then the structure is simple, but the pushing force is insufficient
Solution Approach 1:
The patent introduces dynamic force multiplication through the screw mechanism. The threaded rod converts small rotational forces into large linear forces through the mechanical advantage of the threads, allowing a simple hand-operated tool to generate sufficient pushing force that would otherwise require complex hydraulic systems.
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 safe and effective piston retraction into the brake caliper bore, avoiding damage and oil leakage, while facilitating easy installation of new brake linings with improved operational ease and safety.
Implementation Method 1
a thread rod disposed at the rotation member triggers the movable plate to move toward or away from the base
Implementation Method 2
a direction switchable ratchet wrench connected with the rotation member and rotationally driving the rotation member
Data Source
AI summary
A vehicle piston pusher, pushing at least a piston back into a piston bore of a brake caliper, includes a base, a rotation member, a movable plate, and a direction switchable ratchet wrench. The rotation member is rotatably disposed on the base and includes an inner barrel and an outer barrel coupled together. The movable plate has an outer surface and an opposite inner surface. The outer surface contacts at least a piston. The inner surface has a thread rod which is screwedly combined with the inner barrel along an axial direction of the rotation member. The direction switchable ratchet wrench is connected with the rotation member for driving the rotation member, such that the movable plate moves toward or away from the movable plate. When the movable plate moves away from the base, the at least a piston is pushed back into the piston bore.