Disc Brake Pad Mounting With Rotatable Stops for Vibration Control
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Solution Overview
Problem
Existing brake pad holders for vehicle disc brakes face issues with brake pads flapping due to vibrations, leading to excessive movement and reduced spring life, as the rigid hold-down devices rely solely on springs to absorb forces.
Innovation Solution
A brake pad holder design featuring a rigid hold-down device combined with a leaf spring and a rotatable abutment element with stops and counter-stops, which limits the radial and axial movement of brake pads, ensuring they remain securely positioned.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a rigid hold-down device is used to secure brake pads, then the brake pads are held firmly in position, but the spring must absorb all forces from sudden movements and vibrations, reducing spring life
Solution Approach 1:
The hold-down device is segmented into a rigid bracket portion and a separate stop element. The rigid bracket provides stable positioning, while the stop element (with stop surfaces) works independently with the spring to limit movement. This segmentation allows each component to specialize: the rigid bracket for stability and the spring-stop combination for movement limitation, reducing stress on the spring.
Solution Approach 2:
The stop element acts as an intermediary between the rigid hold-down device and the spring. It provides stop surfaces that directly engage with the brake pad or hold-down device to limit movement, thereby mediating the force transmission and preventing full force from being transmitted to the spring during sudden movements.
2Stability of the object's composition
If the hold-down device is made rigid to prevent brake pad movement, then positioning is improved, but forces from vibrations and sudden movements cannot be absorbed, potentially damaging the system
Solution Approach 1:
The system combines rigid and dynamic elements. The bracket is rigid for stable positioning, while the stop element is designed to move and rotate, providing dynamic response to vibrations and sudden movements. The stop surfaces can engage and disengage as needed, allowing the system to adapt to varying conditions while maintaining reliability.
Solution Approach 2:
The stop element is pre-positioned with stop surfaces that will engage before excessive movement occurs. This beforehand cushioning limits the range of motion during vibrations or sudden movements, preventing damage before it can occur. The spring also provides continuous cushioning force to maintain contact between brake pads and disc.
3Duration of action of stationary object
If stops are added to limit brake pad movement, then spring life is extended, but the device complexity increases
Solution Approach 1:
The stop element is merged with the bracket as a single integrated component. The stop surfaces are formed as extensions or features of the bracket structure itself, rather than being separate parts. This merging reduces the number of components while still providing the necessary stop functionality to extend spring life.
Solution Approach 2:
The stop element serves multiple functions: it provides stop surfaces to limit movement, maintains proper spacing between components, and can be designed to facilitate assembly. This multi-functionality reduces the need for additional specialized components, thereby reducing overall device complexity while still achieving the goal of extending spring life.
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 limits the movement of brake pads during vibrations, reducing the stress on the spring and extending its lifespan by using a combination of spring force and stop mechanisms to maintain pad position.
Implementation Method 1
a spring extends outside, along the hold-down device, with its ends fixed opposite the brake caliper, and it applies a hold-down force to the hold-down device towards the disc brake axle
Implementation Method 2
one of the two abutments is located on an abutment element which is rotatable about an axis which extends in the circumferential direction of the brake lining and on which at least one stop is formed which is opposite a counter-stop formed on the brake lining
Data Source
Figure 1~2
Figure 3a~3b
Figure 3c
AI summary
A brake pad holder for a vehicle disc brake is proposed, comprising brake pads (3) arranged on both sides of a radially extending brake disc in a pad recess (6), a rigid retainer (7) extending transversely over the brake pads (3), and a leaf spring (9) extending along the retainer (7). This leaf spring is supported at one end by its two spring ends against abutments, and at the other end by a spring section located between the spring ends against the side of the retainer (7) facing away from the brake pads (3). To address the problem of significant movement of the brake pads under certain driving conditions, e.g., in the case of strong vibrations of the disc brake, one of the two abutments (62A) is located on a locking or support element (60) that is rotatable about an axis (13A) extending circumferentially around the brake pad (3).The locking or support element (60) has at least one stop (64) which is opposite a counter-stop (48) formed on the brake pad (3).