Anti-Rattle Brake Caliper Piston Assembly With Damping Nut Interface
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Solution Overview
Problem
Current braking systems, particularly electric parking brakes, experience rattling issues due to axial and pivoting movements of components during braking operations, leading to noise and potential misalignment, which affect braking performance.
Innovation Solution
A piston assembly with a damping member that encircles a nut and spindle, featuring a sliding or rolling interface, is designed to prevent rattling by maintaining alignment and allowing axial movement, thereby minimizing noise and maintaining braking efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a nut and spindle assembly is used for axial piston movement, then the parking brake function is achieved, but rattling noise occurs due to relative axial movement between components
Solution Approach 1:
A damping member is introduced as an intermediary element between the nut and the piston. This damping member has a sliding interface with the piston and encircles the nut, absorbing relative axial movements and preventing direct contact between the metal components that would generate rattling noise. The damping member acts as a mediator that maintains the necessary mechanical connection while eliminating the harmful rattling effect.
2Ease of operation
If the nut is allowed to move axially relative to the piston, then the piston can be actuated for braking, but component misalignment occurs leading to performance degradation
Solution Approach 1:
The damping member is designed with dynamic characteristics that allow it to adapt to relative axial movements between the nut and piston during braking operations. The sliding interface enables controlled movement while the damping properties maintain component alignment through the movement cycle, preventing misalignment that would degrade performance.
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 damping member effectively reduces rattling noise and maintains component alignment, ensuring consistent braking performance and reducing the impact on axial movement, thus enhancing the overall braking system's reliability and quiet operation.
Implementation Method 1
A damping member encircles the nut and has one of a sliding interface and a rolling interface with the piston in response to relative axial movement between the nut and the piston to prevent rattling of the nut against the piston
Implementation Method 2
A damping member encircles the nut and has one of a sliding interface and a rolling interface with the piston
Data Source
AI summary
A piston assembly for a disc brake assembly having a housing with a passage includes a piston provided in the passage and axially movable therein in response to hydraulic pressure. A rotatable spindle extends into the piston. A nut is threadably connected to the spindle such that rotation of the spindle results in axial movement of the nut within the passage to thereby axially move the piston. A damping member encircles the nut and has one of a sliding and rolling interface with the piston in response to relative axial movement between the nut and the piston to prevent rattling of the nut against the piston.