Disc Brake Caliper Piston Roll-Back Device
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Solution Overview
Problem
Existing disc brake caliper piston roll-back devices suffer from operation variability due to the dual function of gaskets as seals and elastic elements, leading to inconsistent and temperature-sensitive performance, and complex constructions that complicate assembly and machining.
Innovation Solution
A disc brake caliper design featuring a piston with separate annular seats for sealing and elastic roll-back, where the sealing gasket is prevented from deforming axially and the elastic gasket is designed for controlled deformation to ensure consistent and repeatable piston return, thus separating sealing and roll-back functions and keeping the brake fluid away from heat sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single gasket performs both sealing and elastic roll-back functions, then the device construction is simple, but the operation reliability deteriorates due to variability caused by brake fluid pressure and heat
Solution Approach 1:
The patent divides the single gasket function into two separate components: a sealing gasket (first gasket) that provides fluid sealing, and a roll-back gasket (second gasket) that provides elastic return. This segmentation eliminates the interference between sealing and roll-back functions, ensuring consistent operation reliability while maintaining construction simplicity through modular design.
2Ease of operation
If the gasket deforms elastically under brake fluid pressure to enable roll-back, then the piston return function is achieved, but the operation variability increases due to pressure-dependent deformation
Solution Approach 1:
The patent separates the sealing function (first gasket) from the roll-back function (second gasket). The second gasket is specifically designed to deform elastically under controlled conditions to provide consistent roll-back, while the first gasket maintains sealing independent of deformation. This segmentation reduces operation variability by dedicating each gasket to its optimal function.
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 solution provides accurate, repeatable, and consistent piston roll-back, reducing operation variability and simplifying assembly and machining, while maintaining reliable sealing and preventing unwanted braking torque, ensuring precise control and uniform wear of brake pads.
Implementation Method 1
the second gasket with a shape adapted for a controlled elastic deformation in a direction parallel to the thrust axis
Implementation Method 2
the vicinity of the gasket to the source of heat which is generated by the friction between the disc and pad causes an unwanted temperature rise of the brake fluid
Data Source
AI summary
Disc brake calipers with a piston roll-back device capable of allowing accurate and repeatable roll-back of pistons and which are easy to construct and assemble are provided.