Brake Pad Hold Down Device for Vibration Suppression
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Solution Overview
Problem
U-shaped brake pad hold down springs in pneumatically-operated disc brakes are ineffective in suppressing brake pad kick and vibration as they wear down, due to being mounted directly onto the brake pads, leading to reduced retention force and increased wear.
Innovation Solution
A brake pad hold down device with at least four contact points, mounted directly onto the brake carrier, which includes a spring member with projections that exert a retaining force on the brake pad and bias the caliper against its mounting pins, providing improved suppression of brake pad kick and vibration, and facilitating easier installation and removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If u-shaped brake pad hold down springs are mounted directly onto the brake pad, then the device structure is simple, but the ability to suppress brake pad kick and vibration decreases as the brake pads wear down
Solution Approach 1:
The patent introduces a hold down bar as an intermediary component mounted on the brake carrier rather than directly on the brake pad. This mediator maintains consistent retention force throughout the brake pad's service life, as it is not affected by brake pad wear. The hold down bar works in conjunction with the spring to provide stable suppression of brake pad kick and vibration.
Solution Approach 2:
The retention system is segmented into multiple functional components: the spring member mounted on the brake carrier, the hold down bar that contacts the brake pad, and the mounting bracket. This segmentation allows each component to perform its specific function optimally, with the spring providing force, the bar providing contact, and the bracket providing mounting stability.
2Ease of operation
If u-shaped brake pad hold down springs are mounted directly onto the brake pad, then the installation is straightforward, but the force exerted decreases as the brake pads wear down
Solution Approach 1:
The hold down bar serves as a mediator between the spring and the brake pad, allowing the spring to maintain constant retention force regardless of brake pad thickness. The bar transfers the spring force to the brake pad while being independent of the pad's wear state.
Solution Approach 2:
The system incorporates dynamic adjustment capability where the hold down bar can move vertically to accommodate varying brake pad thickness during wear, while the spring maintains constant force. This dynamic adaptation ensures consistent retention force throughout the service life.
3Device complexity
If hold down bars provide only a single retaining point along the length of the brake pad, then the device structure is simple, but the effectiveness at suppressing brake pad vibration is reduced
Solution Approach 1:
The hold down bar is designed with multiple contact points along its length, creating different local retention zones. The bar can contact the brake pad at multiple locations simultaneously, providing distributed vibration suppression rather than a single point of contact. This local quality enhancement targets specific vibration modes effectively.
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 effectively suppresses brake pad kick and vibration across the life of the brake pads, reduces uneven wear, and enhances brake caliper preloading, resulting in improved longevity and ease of maintenance.
Implementation Method 1
a brake pad hold down device with at least four contact points, mounted directly onto the brake carrier, which includes a spring member with projections that exert a retaining force on the brake pad
Implementation Method 2
the brake pad hold down spring may be configured to simultaneously exert a force against inner surfaces of the brake caliper, biasing the caliper against its brake caliper mounting pins, thereby effectively preloading the brake caliper on its mounting pins to further suppress vibration
Data Source
AI summary
A brake pad retaining device is provided for holding a brake pad within a brake caliper of an air disc brake system. The device may be formed as a spring which provides at least four retention forces at longitudinal ends of the brake pad in order to suppress brake pad kick motion and vibration, while applying a biasing force that pre-loads a caliper to its mounting pins. The device may include a mounting section that is coupled to a brake carrier, a first projection and a second projection. The first projection extends from one region of the mounting section to a region near a longitudinal end of the brake pad to thereby exert a radially inward force against the brake pad. The second projection extends from another region of the mounting section to an inner surface of the brake caliper to thereby exert a biasing force against the brake caliper.