Brake Piston Assembly With Integrated Anti-Rotation Guide Slot
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Solution Overview
Problem
Existing electromechanically actuatable brake piston assemblies for motor vehicle disc brakes are costly to manufacture and difficult to assemble, while maintaining reliable operation.
Innovation Solution
The brake piston assembly incorporates a guide slot in the brake piston bearing portion, a screw drive for translation, and an anti-rotation mechanism with a guide element, allowing for axial movement without rotation, and is designed with a cover and seal to protect and secure components, reducing manufacturing complexity and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex anti-rotation mechanism and guide slot are integrated into the brake piston bearing portion, then the reliability of axial movement without rotation is improved, but the manufacturing cost and assembly difficulty increase
Solution Approach 1:
The guide slot and anti-rotation mechanism are integrated directly into the brake piston bearing portion as a unified structure. The guide slot is formed as a through-hole penetrating the brake piston bearing portion, with the anti-rotation mechanism positioned within the same component, merging multiple functions into a single integrated part that reduces manufacturing steps and assembly operations.
Solution Approach 2:
The brake piston bearing portion serves multiple functions simultaneously: it supports the brake piston for axial movement, provides the guide slot for anti-rotation guidance, and houses the anti-rotation mechanism. This multi-functional design eliminates the need for separate guide components and reduces the overall part count while maintaining reliable operation.
2Reliability
If multiple components including guide slot, guide element, and anti-rotation mechanism are assembled together, then the functional reliability is improved, but the assembly difficulty and time increase
Solution Approach 1:
The guide slot is pre-formed as an integrated feature of the brake piston bearing portion during manufacturing, rather than being assembled as a separate component. The anti-rotation mechanism is positioned within the same component structure, allowing the brake piston to be directly installed into the prepared bearing portion without complex multi-step assembly operations.
3Ease of manufacture
If the guide slot is formed as a through-hole penetrating the brake piston bearing portion, then the ease of assembly is improved, but the manufacturing complexity increases
Solution Approach 1:
The guide slot is designed as a through-hole that penetrates the brake piston bearing portion, dividing the anti-rotation guidance function into distinct entry and exit points. This segmentation allows the guide element to pass through freely during assembly while maintaining precise anti-rotation guidance, simplifying the assembly process despite the through-hole structure.
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 design enables economical manufacturing and easy assembly of the brake piston assembly, ensuring reliable operation by preventing rotation and protecting components from contaminants.
Implementation Method 1
a screw drive for translation
Implementation Method 2
an anti-rotation mechanism with a guide element, allowing for axial movement without rotation
Data Source
AI summary
The present disclosure relates to an electromechanically actuatable brake piston assembly for a motor vehicle disc brake, comprising: a brake calliper housing having a bridge, bridge fingers and a brake piston bearing portion; a brake piston which can be axially moved in a first bore of the brake piston bearing portion, said first bore having a bore axis and a first bore wall; a rotation-translation transmission installed in an internal space of the brake piston; and an anti-rotation mechanism having a guide slot and a guide element, which is guided by the guide slot in such a way that the brake piston is limited to its axial degree of freedom of motion. The guide slot is comprised of the brake piston bearing portion and the guide element is fixedly connected to the brake piston.