Disc Brake Guide Pin Locating Feature Reduces Deflection
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Solution Overview
Problem
The existing disc brake assemblies experience deflection and translation issues due to torque forces, leading to joint slippage and reduced ability of the caliper to move brake shoes between braking and non-braking positions, which is not effectively addressed by conventional guide pin designs.
Innovation Solution
The proposed solution involves a brake caliper support assembly with a guide pin locating feature that includes a lug with side faces, a bore extending between the faces, and a fastener with a transition portion that aligns with the caliper center line, allowing the guide pin to be securely positioned within a receiving bore of the anchor bracket, reducing deflection and translation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional guide pins are used in the disc brake assembly, then the guide pins can be easily installed, but the anchor bracket deflects and the caliper translates under torque forces, causing joint slippage
Solution Approach 1:
The guide pin is pre-positioned within the caliper bore at a specific location before assembly, rather than being inserted after assembly. This preliminary positioning ensures the guide pin is correctly located to minimize anchor bracket deflection and caliper translation under torque forces, preventing joint slippage while maintaining ease of installation
Solution Approach 2:
The guide pin acts as an intermediary element between the caliper and anchor bracket, with its specifically located position serving to mediate the forces between these components. By positioning the guide pin at the optimal location within the bore, it effectively reduces the transmission of torque-induced forces that cause deflection and translation
2Reliability
If the guide pins are tapered to prevent joint loosening, then joint slippage is reduced, but the guide pins may bind against the anchor bracket, reducing caliper sliding ability
Solution Approach 1:
Instead of tapering the entire guide pin, the invention uses a guide pin with a specific localized position within the caliper bore. This local quality approach maintains the guide pin's cylindrical shape for smooth sliding while its predetermined position provides the necessary stability to prevent joint loosening, thus resolving the contradiction between reliability and ease of operation
3Manufacturing precision
If the guide pins are tapered to control insertion depth, then insertion depth is controlled, but the caliper translation and anchor bracket deflection are not effectively reduced
Solution Approach 1:
The guide pin is pre-positioned at a specific depth and location within the caliper bore during manufacturing, rather than relying on taper to control insertion depth. This preliminary action ensures both precise insertion depth control and optimal positioning to minimize anchor bracket deflection and caliper translation under operating forces
Data Source
AI summary
A vehicle disc brake assembly comprises a brake caliper and an anchor bracket. The brake caliper has a lug, a bore, an opening, a fastener, and a guide pin. The lug has first and second side faces. The bore extends from the first side face to the second side face. The opening is to the bore at the first side face. The fastener has a transition portion between a bolt stem and a bolt head. The transition portion is fitted to the opening. The guide pin is attached to the fastener. The anchor bracket is supported on the guide pin.