Coaxial Electromechanical Brake Layout for Compact Packaging
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Solution Overview
Problem
Existing electromechanical brakes are not compact enough and require significant maintenance, as they often include complex valve and line structures, which are not suitable for the increasing electrification of motor vehicles.
Innovation Solution
An electromechanical brake design featuring a coaxial arrangement of an electric motor, transmission, and a ramp mechanism, where the ramp mechanism surrounds the motor and transmission, reducing radial and axial space requirements, and incorporating a cup-shaped drive element and cam ring for further compactness, along with wear regulation mechanisms and low-friction components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the electric motor and transmission are arranged radially adjacent to each other, then the radial space requirement is reduced, but the axial space requirement increases
Solution Approach 1:
The patent transitions from a radial arrangement to an axial arrangement of the electric motor and transmission, effectively changing the spatial dimension in which components are positioned. This allows the components to be stacked axially rather than arranged radially, reducing radial space while managing axial space through compact design of the axial stack.
Solution Approach 2:
The patent nests the electric motor within the transmission housing or arranges them in a nested configuration where the motor is positioned inside or concentric with the transmission components. This nesting approach minimizes the overall radial envelope while maintaining the axial stacking benefit.
2Length of moving object
If the ramp mechanism surrounds the electric motor and transmission, then the axial space requirement is reduced, but the device complexity increases
Solution Approach 1:
The ramp mechanism is designed to perform multiple functions: it converts rotational motion to linear motion for brake application, provides structural support for the electric motor and transmission, and defines the axial boundaries of the compact assembly. This multi-functionality reduces the need for separate components, thereby managing complexity while achieving compact axial dimensions.
Solution Approach 2:
The patent merges the ramp mechanism with the housing or structural components of the brake assembly, combining what could be separate elements into integrated structures. This merging reduces the number of discrete parts and simplifies the overall design while maintaining the surrounding configuration that achieves compact axial space.
3Force
If a conventional brake fluid system is used, then braking force is achieved, but the valve and line structure increases maintenance effort
Solution Approach 1:
The patent replaces the hydraulic brake fluid system with an electromechanical system where an electric motor directly generates braking force through the ramp mechanism. This substitution eliminates the need for brake fluid, valves, and lines, thereby eliminating the maintenance issues associated with these components while still achieving the required braking force through direct electromagnetic actuation.
Solution Approach 2:
The patent extracts and removes the entire brake fluid system (fluid, valves, lines) from the brake assembly, replacing it with a self-contained electromechanical actuator. This extraction eliminates the complex valve and line structure that requires maintenance, leaving only solid-state components with minimal maintenance needs.
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 results in a more compact electromechanical brake with reduced maintenance needs, lower friction, and efficient wear compensation, enhancing safety and reducing component costs.
Implementation Method 1
To convert a rotational drive movement of the electric motor into a translational movement for applying a braking force, an example embodiment of the present invention has a ramp mechanism
Implementation Method 2
Between the cam plates, rolling bodies are arranged, which roll along wedge-shaped curves of the cam plate and thereby generate a feeding motion
Implementation Method 3
a bearing arrangement with at least one radial bearing interacting with the cam ring, via which a braking force can be supported on the floor of the housing
Data Source
AI summary
An electromechanical brake. The electromechanical brake includes an electromechanical actuating device which includes an electric motor, which interacts with a transmission, and a ramp mechanism, the ramp mechanism converting a rotational drive movement of the electric motor into a translational movement for applying a braking force. The electric motor and the transmission are arranged coaxially with each other and are at least partially surrounded by the ramp mechanism.