Commercial Vehicle Disc Brake Axial Limiting Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing disk brakes for commercial vehicles face challenges in precise machining due to the location of guide strips deep inside the brake caliper, leading to difficulties in function and potential seizing caused by deformation during braking.
Innovation Solution
A disk brake design that eliminates the need for guide strips inside the brake caliper by using a first and second limiting device with stops on the pressure piece and brake shaft, respectively, to control displaceability, allowing for simplified production and preventing seizing through increased play due to deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If guide strips are provided deep inside the brake caliper to limit displaceability, then the brake components are guided in the axial direction, but precise machining becomes difficult and deformation during braking can cause seizing
Solution Approach 1:
The patent extracts the limiting function from the internal guide strips deep inside the brake caliper and relocates it to external stops on the brake shaft. This removes the problematic guide strips that caused machining difficulties while preserving the essential function of limiting axial displacement to prevent seizing.
Solution Approach 2:
Instead of using guide strips to actively guide and constrain the brake shaft, the invention uses stops that passively limit displacement only when necessary. The stops engage only at the extreme positions, allowing free movement during normal operation while preventing excessive displacement that would cause seizing.
2Ease of operation
If guide strips are used to limit displaceability, then axial guidance is achieved, but the structure becomes complex and difficult to manufacture
Solution Approach 1:
The patent removes the complex internal guide strip structure from the brake caliper and replaces it with simple external stops on the brake shaft. This extraction simplifies the overall structure while maintaining the essential axial guidance function through a much easier-to-manufacture solution.
Solution Approach 2:
Instead of providing continuous guidance along the entire length of the brake shaft with guide strips, the invention applies limiting features only at the specific locations where displacement needs to be constrained—the stops are positioned locally at the ends of the allowable travel range, simplifying the overall structure.
3Measurement precision
If the play between brake shaft and guide strip is reduced to improve guidance, then axial guidance precision improves, but deformation during braking causes the play to reduce further leading to seizing
Solution Approach 1:
Rather than using continuous contact guidance that reduces play to improve precision, the invention uses stop-based limiting that maintains larger play during normal operation. The stops only engage when displacement reaches the predefined limits, preventing seizing while allowing sufficient play to accommodate thermal expansion and deformation during braking.
Data Source
AI summary
A disk brake includes a brake disc, a brake shaft having a rotation axis that lies parallel to a main plane of the brake disc, a brake pad lying on a same side as the brake shaft relative to the brake disc, a pressure piece disposed between the brake shaft and the brake pad, a first limiting device configured to limit, to a predefined first extent, the displaceability of the pressure piece relative to the brake disc in a direction parallel to the rotation axis of the brake shaft, and a second limiting device configured to limit, to a predefined second extent, the displaceability of the brake shaft relative to the brake disc in a direction parallel to the rotation axis of the brake shaft, the second limiting device comprising a first stop on the pressure piece and a second stop on the brake shaft.