Electromechanical Parking Brake Axial Positioning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electromechanical parking brakes face challenges in assembly complexity, time-consuming assembly procedures, difficulty in accurately determining the axial position of the piston, and high manufacturing and assembly costs due to stringent tolerances, as well as limitations in material usage and tolerances for different functions.
Innovation Solution
The design incorporates an epicycloid reducer with combined motor-reducer components, a male/female screw assembly with axial locking members, and elastic means to ensure accurate piston positioning, allowing for easier assembly, reduced component count, and independent optimization of materials and tolerances, along with a control unit for precise axial control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the male/female screw assembly is lubricated and assembled separately with release and re-assembly steps, then the proper operation can be tested, but the assembling operation becomes time-consuming and complex
Solution Approach 1:
The patent combines the male screw and female screw into a single integrated screw assembly that is pre-lubricated and pre-assembled as one unit. This eliminates the need for separate assembly steps, release operations, and re-assembly, thereby reducing assembly time and complexity while maintaining operational reliability through the integrated design.
2Manufacturing precision
If stringent tolerances are applied to all components, then accurate piston positioning is achieved, but manufacturing and assembling costs increase
Solution Approach 1:
The patent applies different tolerance levels to different components based on their functional requirements. Critical components that directly affect piston positioning accuracy receive stringent tolerances, while non-critical components are manufactured with more relaxed tolerances. This selective approach maintains the required axial positioning accuracy while significantly reducing overall manufacturing and assembly costs.
3Device complexity
If multiple functions are concentrated in a single piece, then component count is reduced, but differentiated material usage and function-specific tolerances are hindered
Solution Approach 1:
The patent divides the brake system into distinct functional modules, each optimized for its specific function. The calliper body, piston, and screw assembly are separate components that can be manufactured with different materials and tolerances according to their specific requirements. This modular segmentation reduces overall device complexity while maintaining the ability to use differentiated materials and function-specific tolerances for each component.
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
This configuration simplifies assembly, ensures accurate axial positioning of the piston based on the motor shaft's angular position, reduces manufacturing and assembly costs, and allows for differentiated material usage, resulting in a more efficient and cost-effective electromechanical parking brake system.
Implementation Method 1
an electric motor, first transmission means of a rotating motion of a drive shaft of the electric motor
Implementation Method 2
epicycloid reducer, the epicycloid reducer, second transmission means of the rotating motion of the epicycloid reducer
Implementation Method 3
a male/female screw assembly for transforming the rotating motion of the epicycloid reducer into a translating motion applicable to a piston
Implementation Method 4
a pad in contact with the brake disc for tightening it against the brake disc
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A parking brake (1) for disc brake comprises a electromechanical thrust unit with a piston (18), an electric motor (11), a male/female screw assembly (16, 17) connected between the electric motor (11) and the piston (18) for transforming the rotating motion generated by the motor (11) into a translating motion which can be applied to the piston (18), as well as locking means (58, 59, 61) locking the female screw (17) automatically to the piston (18), when the preassembled male/female screw assembly (16, 17) is pushed in a thrust seat (46) of the piston (18).