Brake Caliper Guide Pin Assembly for Wear Compensation
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Solution Overview
Problem
Existing brake assemblies for disc brakes face challenges in efficiently managing the movement and wear of components, particularly the guide pin assembly, which affects the sliding motion and contact between the brake caliper and the rotor, leading to unintended wear and reduced fuel efficiency.
Innovation Solution
A brake assembly that incorporates a guide pin assembly with a bushing supported by a resilient member, allowing the brake caliper to slide along the outer surface of the bushing, which helps compensate for wear and facilitates the disengagement of brake pads from the rotor, reducing friction and temperature, and improving fuel economy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional guide pin assembly is used in the brake caliper, then the structure is simple, but the brake pads experience unintended wear and increased friction during non-braking conditions
Solution Approach 1:
The guide pin assembly is segmented into multiple functional components: a guide pin with a cylindrical outer surface, a resilient member (spring) disposed around the guide pin, and a bushing with an inner surface receiving the guide pin and an outer surface engaged by the caliper. This segmentation allows each component to perform its specific function independently, with the resilient member providing continuous contact force and the bushing providing a wear-compensating sliding surface, thereby solving the wear management problem while maintaining reasonable structural complexity
Solution Approach 2:
The bushing acts as an intermediary component between the guide pin and the caliper housing. It receives the guide pin on its inner surface and is engaged by the caliper on its outer surface, providing a controlled sliding interface. This intermediary bushing with its resilient member support allows the caliper to slide smoothly while compensating for wear, preventing the unintended pad engagement that would occur with a direct guide pin-to-caliper connection
2Productivity
If the brake caliper slides along a fixed guide pin, then the structure is stable, but the brake pads drag against the rotor during non-braking conditions, reducing fuel efficiency
Solution Approach 1:
The guide pin assembly is made dynamic through the inclusion of a resilient member (spring) that allows the bushing to move relative to the guide pin. This dynamic configuration enables the caliper to automatically adjust its position and maintain proper clearance from the rotor during non-braking conditions, eliminating the dragging friction that reduces fuel efficiency while preserving structural stability through the guided motion
3Reliability
If a resilient member is added to support the bushing, then wear compensation and pad disengagement are improved, but the device complexity increases
Solution Approach 1:
The resilient member (spring) provides self-service functionality by automatically maintaining contact between the bushing and the caliper, and by exerting a continuous force to keep the brake pads disengaged from the rotor during non-braking conditions. This self-actuating mechanism eliminates the need for external actuators or complex control systems, achieving reliable pad disengagement while adding minimal complexity to the guide pin assembly
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 enhances the brake assembly's ability to manage wear and reduce friction, preventing unintended pad engagement during non-braking conditions, thus minimizing wear, lowering temperatures, and improving fuel efficiency.
Implementation Method 1
a bushing (84) that is movable relative to the guide pin (28) along an axis (62) and that includes an inner surface (126) that receives the guide pin (28) and an outer surface (124) that is engaged by the brake caliper (22)
Data Source
Figure 1
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AI summary
A brake assembly having a guide pin assembly that slidably couples a brake caliper to a brake carrier. The guide pin assembly may include a resilient member that extends between a bushing and a sleeve. The sleeve may be mounted to the brake carrier. The brake caliper may be slidable along the bushing.