Electromechanical Brake Layout With Bistable Parking Lock
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Solution Overview
Problem
Existing electromechanical brakes for motor vehicles face challenges in reducing assembly outlay and space requirements while maintaining effective braking functionality, particularly for the parking brake mechanism.
Innovation Solution
An electromechanical brake design featuring a magnetic actuator and control unit axially arranged relative to the electric motor, with a pin that can be held in bistable positions using a disk with recesses or a toothed/axial impeller, allowing for reduced space and cabling requirements, and incorporating a latching mechanism for stable pin positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional parking brake mechanism with separate components is used, then reliable braking function is achieved, but assembly outlay and space requirements increase
Solution Approach 1:
The patent combines the parking brake function with the service brake components by integrating a pin into the brake piston assembly. The pin can be held in bistable positions (braked and unbraked) and interacts with recesses in the disk, eliminating the need for separate parking brake mechanisms and reducing assembly complexity while maintaining reliable braking function.
Solution Approach 2:
The brake piston assembly serves multiple functions: it provides both service braking through hydraulic actuation and parking braking through the magnetically actuated pin mechanism. The disk serves dual purposes as both a braking surface and a component with recesses for pin positioning, reducing the total number of parts and assembly steps.
2Reliability
If a traditional parking brake mechanism with separate components is used, then reliable braking function is achieved, but space requirements increase
Solution Approach 1:
The patent combines the parking brake function with the service brake components by integrating a pin into the brake piston assembly. The pin can be held in bistable positions (braked and unbraked) and interacts with recesses in the disk, eliminating the need for separate parking brake mechanisms and reducing assembly complexity while maintaining reliable braking function.
Solution Approach 2:
The pin is nested within the brake piston assembly and interacts with recesses in the disk that is already present in the braking system. The magnetic actuator is positioned within the axial space of the brake caliper, utilizing existing spaces rather than requiring additional external components, thereby reducing overall space requirements.
3Volume of moving object
If the control unit and magnetic actuator are arranged radially relative to the electric motor, then space for components is available, but cabling outlay and assembly complexity increase
Solution Approach 1:
The patent transitions from a radial arrangement of control components to an axial arrangement relative to the electric motor. The control unit and magnetic actuator are positioned in the axial direction, allowing direct connection to the control unit and reducing cabling requirements. This dimensional change in component layout simplifies the electrical connections while maintaining adequate space for the components within the brake caliper.
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 design reduces assembly complexity, space requirements, and costs by enabling the pin to be held in stable positions without continuous energization, simplifying the assembly process and maintaining effective braking functionality, including the ability to form a parking brake without additional components.
Implementation Method 1
A magnetic actuator (32) which axially moves a pin (68) so that one end of the pin (68) interacts with the recesses (56) of the disk (52)
Data Source
AI summary
An electromechanical brake for braking a motor vehicle. The electromechanical brake includes an electric motor having a shaft via which a brake piston can be axially moved for braking. A disk is arranged on the shaft and has a plurality of recesses arranged in the circumferential direction. In addition, the electromechanical brake includes a magnetic actuator which axially moves a pin so that one end of the pin interacts with the recesses of the disk and blocks a movement of the shaft in a brake release direction, whereby the pin can be held in a bistable manner. The magnetic actuator and a control unit, for controlling the electric motor and the magnetic actuator, are arranged in the axial direction relative to the electric motor, and the pin is movable parallel to the shaft.