Caliper Brake Boot With Elastic Roll-Back for Drag Prevention
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Solution Overview
Problem
Conventional caliper brakes experience a drag phenomenon where the piston fails to return smoothly to its original position after braking, leading to friction between the disk and friction pad, and the use of a retraction spring increases manufacturing costs and complicates installation, while also potentially reducing clearance between the pad and disk.
Innovation Solution
A boot for the caliper brake is designed with a first coupling part attached to the guide rod and a second coupling part with an elastic protrusion on the carrier, generating a reaction force to facilitate the roll-back of the caliper housing during braking, eliminating the need for a separate retraction spring and ensuring proper clearance between the disk and pad.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the seal member's elastic deformable range is increased by expanding the inclination surface of the seal groove, then the drag phenomenon is reduced, but the required amount of braking fluid increases which deteriorates pedal feel
Solution Approach 1:
The boot acts as an intermediary component between the guide rod and caliper housing, providing the elastic reaction force needed for roll-back without requiring increased seal member deformation. This mediator approach allows the system to achieve drag prevention while maintaining normal braking fluid levels.
Solution Approach 2:
The invention changes the parameter of force generation from seal member elastic deformation to boot elastic reaction force. By modifying the force generation mechanism rather than increasing seal deformation, the system prevents drag without requiring additional braking fluid volume.
2Reliability
If a retraction spring is installed at the upper end of the pad plates, then the piston can be returned to its original position, but the processing and manufacturing costs increase and installation becomes difficult
Solution Approach 1:
The boot combines multiple functions into a single component: it protects the guide rod, provides structural support, and generates the elastic reaction force for caliper housing roll-back. This merging eliminates the need for separate retraction springs, reducing manufacturing complexity and installation difficulty.
Solution Approach 2:
The boot serves multiple purposes simultaneously: it acts as a protective boot for the guide rod, a structural support element, and a force-generating component for roll-back. This multi-functionality replaces what would otherwise require multiple separate components including retraction springs.
3Reliability
If a retraction spring is installed to provide elastic force to the pad plates, then the piston returns to its original position, but the clearance between the friction pad and disk may not be secured
Solution Approach 1:
The boot serves as an intermediary that generates reaction force specifically for caliper housing roll-back, which indirectly and more effectively restores pad-disk clearance compared to direct pad plate springing. This mediator approach ensures proper clearance while maintaining piston return function.
4Power
If the caliper housing slides from the carrier by reaction force during braking, then the outer pad plate is pressed toward the disk, but the piston fails to return smoothly after braking causing drag phenomenon
Solution Approach 1:
The boot is pre-positioned and pre-loaded to provide elastic reaction force that acts immediately when braking is released, preliminarily preparing the system for smooth roll-back. This preliminary action ensures the piston returns smoothly without drag without interfering with the braking power generation.
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 boot effectively prevents the drag phenomenon by generating a reaction force to smoothly return the caliper housing to its original position, reducing manufacturing costs and maintaining proper clearance without the need for a retraction spring.
Implementation Method 1
an elastic protrusion provided to be in contact with an outer surface of the guide rod so that a reaction force is generated by the guide rod moving together with the caliper housing during braking
Data Source
AI summary
Disclosed are a boot for a caliper brake and the caliper brake including the same. The boot, which is provided to be installed on a guide rod to allow a caliper housing to be slidably coupled to a carrier during braking, includes a first coupling part coupled to the guide rod at one end thereof, and a second coupling part coupled to the carrier at the other end thereof, wherein the second coupling part is provided with an elastic protrusion provided to be in contact with an outer surface of the guide rod so that a reaction force is generated by the guide rod moving together with the caliper housing during braking.