Brake Piston Anti-Rotation Ring for Compact EM Brake Assembly
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing actuator assemblies for vehicle brakes face challenges in preventing rotation of the brake piston while maintaining a simple design and minimizing installation space, especially in electromechanical vehicle brakes.
Innovation Solution
A rotation prevention arrangement using a ring with radially outward securing projections that engages with grooves in the brake calliper unit, allowing the brake piston to be guided in a rotationally secure manner without the need for additional housing-fixed components, and enabling precise displacement control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a rotation prevention arrangement is implemented using a ring pressed onto the brake piston, then the brake piston is guided in a rotationally secure manner with minimal installation space, but the mounting and dismounting process requires precise alignment and sufficient axial force
Solution Approach 1:
The rotation prevention function is segmented into a separate ring component that can be independently mounted on the brake piston. This ring with securing projections engages with grooves in the holder, providing rotation prevention without requiring integration into the main housing structure, thus minimizing axial installation space while maintaining ease of assembly through modular design
Solution Approach 2:
The ring is designed to be pressed onto the brake piston using the existing axial displacement force from the spindle drive, without requiring additional mounting tools or complex alignment procedures. The frictional and clamping forces generated by pressing secure the ring in place, allowing the mounting process to utilize the system's own operational forces
2Device complexity
If the ring is fixed solely by force-based engagement through pressing, then the design is simplified with fewer components, but the securing force depends on maintaining sufficient frictional and clamping forces
Solution Approach 1:
The ring combines multiple functions into a single component: rotation prevention through securing projections engaging with grooves, axial positioning through engagement with the brake piston contact surface, and structural support as part of the holder assembly. This merging eliminates the need for separate fixation components while maintaining reliable securing through the integrated force-based engagement design
Solution Approach 2:
The contact surface on the brake piston is designed with a slightly conical shape, and the ring's inner circumferential surface is shaped to match this curvature. This geometric matching ensures uniform distribution of clamping forces around the circumference, enhancing the reliability of the force-based engagement while maintaining a simple single-component design
3Manufacturing precision
If the groove is closed at both ends to define displacement path, then the brake piston displacement is precisely controlled, but the mounting of the ring requires precise alignment with the grooves
Solution Approach 1:
The grooves in the holder are pre-formed with closed ends that define the exact displacement path for the brake piston. This preliminary structuring of the grooves ensures precise displacement control is built into the component design, while the open top of the grooves allows easy alignment and insertion of the ring during mounting without requiring complex alignment procedures
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 effectively secures the brake piston against rotation while optimizing axial installation space and allowing for accurate displacement path specification, facilitating easy mounting and dismounting with minimal effort and no need for additional components.
Implementation Method 1
the ring is fixed on the contact surface by force-based engagement solely by the frictional and clamping forces that are generated by pressing
Data Source
AI summary
An actuator assembly of an electromechanical vehicle brake has a linearly displaceable brake piston, a brake calliper unit having a holder for the brake piston, and a rotation prevention arrangement. The rotation prevention arrangement comprises a ring pushed onto a contact surface on the brake piston and connected in a rotationally fixed manner to the brake piston at an inner circumferential surface. The ring has at least one radially outwardly protruding securing projection, and a groove associated with the securing projection, which runs in the axial direction in the inner circumferential surface of the holder. A method for mounting and dismounting the brake piston is also disclosed.