Disc Brake Piston Retraction Tool With Expandable Backing Plate
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Solution Overview
Problem
Conventional disc brake piston retraction tools struggle to synchronously retract pistons in large dual-cylinder caliper housings due to insufficient width of the working surfaces of the pressure plates, necessitating multiple tools and increased costs.
Innovation Solution
A disc brake piston retraction tool with a backing plate expansion structure, featuring a reversible ratchet wrench and a locking device with a plug, compression spring, steel ball, and sleeve, allowing the pressure plates to expand or retract, and a backing plate with increased width, enabling easy adaptation to single or dual-cylinder brakes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional disc brake piston retraction tool is used with a single-cylinder caliper housing, then the piston can be retracted effectively, but the tool cannot synchronously retract pistons in dual-cylinder caliper housings due to insufficient working surface width
Solution Approach 1:
The pressure plate is divided into a base structure and an expandable backing plate structure. The backing plate can be extended outward from the pressure plate to increase the working surface width, allowing the tool to accommodate dual-cylinder caliper housings while maintaining compatibility with single-cylinder applications when the backing plate is retracted.
Solution Approach 2:
The backing plate is designed with a dynamic expansion mechanism that allows it to extend and retract. When expanded, it provides sufficient working surface width for dual-cylinder applications; when retracted, it maintains a compact profile for single-cylinder applications, enabling the tool to adapt to different brake types.
2Ease of operation
If tools of different specifications are used to solve the dual-cylinder piston retraction problem, then the pistons can be retracted synchronously, but the cost to purchase tools increases
Solution Approach 1:
The disc brake piston retraction tool is designed with universal adaptability through the expandable backing plate mechanism. A single tool can handle both single-cylinder and dual-cylinder caliper housings by adjusting the backing plate expansion, eliminating the need to purchase multiple specialized tools while maintaining full functionality for different brake types.
3Adaptability or versatility
If the backing plate width is increased to accommodate dual-cylinder brakes, then synchronous piston retraction is enabled, but the tool structure becomes more complex
Solution Approach 1:
The backing plate is nested within or adjacent to the pressure plate structure, allowing it to be stored in a compact form when not in use. The expansion mechanism enables the backing plate to extend outward only when needed for dual-cylinder applications, maintaining a simple overall tool structure while providing enhanced functionality when required.
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 and cost-effective retraction of pistons in both single and dual-cylinder brakes by expanding the working surface width of the pressure plates, facilitating quick assembly and disassembly without the need for multiple tools.
Implementation Method 1
a compression spring (32) and a steel ball (33). The compression spring (32) is installed in the receiving hole (312). The steel ball (33) is in contact with one end of the compression spring (32) and installed in the receiving hole (312). The steel ball (33) is biased by the compression spring (32).
Data Source
AI summary
A disc brake piston retraction tool is provided. When the tool is applied to a large-scale disc brake, it is necessary to increase the width in the left-to-right direction of the working surface of a pressure plate of the tool. A plate expansion unit is coupled to the outer surface of the pressure plate. When a locking unit is inserted in a coupling hole of the pressure plate, a steel ball is retracted. After the steel ball passes through the coupling hole, a compression spring rebounds to produce a positioning effect. The backing plate can be easily and quickly mounted to the outer surface of the pressure plate to increase the width of the working surface of the pressure plate. The locking device allows the steel ball to be retracted to exit the coupling hole.