Vehicle Disc Brake Caliper Axial Claws
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Solution Overview
Problem
In pin-sliding type vehicle disc brakes, the inward pieces of pad retainers often interfere with reacting claws, limiting the reduction in size of the disc brake due to their design.
Innovation Solution
The reacting claws are lengthened to extend radially outward beyond the inward pieces of the pad retainers, allowing the inward pieces to be positioned further inward, preventing interference and enabling a smaller disc brake design. Additionally, the inward pieces are inclined radially outward, and the caliper body includes multiple cylinder bores with reacting claws extending inward, enhancing rigidity and pad pressing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the inward pieces of pad retainers are disposed near the reacting claws to support the friction pads, then the friction pads are properly supported and guided, but the inward pieces interfere with the reacting claws, preventing reduction in the circumferential length of the rotor
Solution Approach 1:
The reacting claws are designed to extend in the axial direction (depth dimension) rather than only in the radial direction. By positioning the distal end portions of the reacting claws further axially than the inward pieces of the pad retainers, the patent creates spatial separation in the axial dimension, eliminating interference while maintaining both pad support functionality and compact radial dimensions.
2Volume of moving object
If the circumferential length of the rotor is reduced to minimize disc brake size, then the overall compactness is improved, but the inward pieces of pad retainers interfere with the reacting claws, constraining further size reduction
Solution Approach 1:
The patent resolves the spatial conflict by utilizing the axial dimension for separation. The reacting claws extend axially beyond the inward pieces, creating clear separation in the Z-direction (axial direction) while allowing both components to occupy compact radial space. This dimensional repositioning enables compact rotor design without component interference.
3Reliability
If the reacting claws are extended radially outward to prevent interference with inward pieces, then interference is eliminated, but the radial space occupation increases, preventing size reduction
Solution Approach 1:
Instead of extending the reacting claws radially outward (increasing R-direction length), the patent extends them axially (increasing Z-direction length). This dimensional shift allows the distal end portions of the reacting claws to position beyond the inward pieces in the axial direction, preventing interference without increasing radial space occupation, thereby maintaining compact disc brake dimensions.
Data Source
AI summary
One embodiment provides a vehicle disc brake, including a caliper body, a caliper bracket, a pair of friction pads and pad retainers. Lengths of a part of reacting claws of the caliper body are set so that distal end portions thereof are disposed further radially outwards in a radial direction of a disc brake rotor than inward pieces of retainer portions of pad retainers. And, distal end portions of the inward pieces are brought into abutment with lug pieces of the friction pads in a position which lies further inwards of the caliper body than circumferential end faces of these reacting claws.