Brake Caliper Piston Retraction Elastic Compensation
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Solution Overview
Problem
Existing devices for retracting pistons in brake calipers fail to fully compensate for the elastic deformations of both the gasket and the caliper body during braking, leading to residual braking torque and inefficient pad and disc wear, as the piston may remain partially extracted after the braking action.
Innovation Solution
A device featuring an elastic ring and element that accumulates and releases elastic deformation energy to ensure complete piston retraction, with the elastic ring dilating to increase the volume of the chamber and allow a larger deformed portion of the elastic element to advance and return, compensating for the overall system deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple gasket is used for piston retraction, then the device complexity is reduced, but the piston cannot fully compensate for caliper body elastic deformation at high braking pressures
Solution Approach 1:
The elastic element is divided into multiple functional zones: a first portion that contacts the piston and provides initial retraction force, and a second portion that contacts the caliper body to compensate for its elastic deformation. This segmentation allows each portion to address specific deformation sources independently, ensuring complete piston retraction while maintaining manageable device complexity.
Solution Approach 2:
The elastic element's geometric parameters are specifically designed to match the caliper body's deformation characteristics. By adjusting the length, cross-section, and material properties of the elastic element, the device compensates for varying degrees of elastic deformation at different braking pressures, achieving reliable piston retraction across the full operating range.
2Reliability
If the elastic element is made longer to increase deformation capacity, then the compensation for caliper body deformation improves, but the device length increases
Solution Approach 1:
Instead of uniformly increasing the entire elastic element length, the invention concentrates the deformation capacity in specific local zones. The first and second portions are designed with optimized local geometric properties that maximize deformation efficiency, allowing adequate compensation for caliper body deformation without excessive overall length increase.
Solution Approach 2:
The elastic element utilizes multiple deformation dimensions simultaneously - both axial compression and radial expansion. This multi-dimensional deformation capability allows the element to achieve greater total deformation capacity within a more compact length, as the deformation is distributed across different spatial directions rather than relying solely on axial elongation.
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
This solution ensures complete piston retraction, preventing residual braking torque and reducing pad and disc wear by compensating for both gasket and caliper body deformations, resulting in improved braking efficiency and system performance.
Implementation Method 1
elastically deforming in the sliding direction of the piston during the biasing of the pressurized brake fluid, thus accumulating elastic deformation energy
Implementation Method 2
the elastic ring dilating to increase the volume of the chamber and allow a larger deformed portion of the elastic element to advance and return
Data Source
AI summary
A device for retracting a piston for a brake caliper is disclosed. The device is suitable for actuating at least one pad for brake calipers of the type comprising a body arranged astride of a brake disc having a rotation axis and two opposite friction surfaces perpendicular to the rotation axis. The piston is suitable for axially translating, thus bringing each pad in contact with force against a respective friction surface of the disc, generating a braking friction torque that is opposite to the rotation direction of the disc. The piston is slidably actuated within a respective seat formed in the caliper body, biased by the pressure of a brake fluid supplied by a supplying plant, in a manner that is controlled by a user to carry out a braking action.