Offset-Shaft Electromechanical Brake Layout for Compact Wheel Packaging
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Solution Overview
Problem
Existing electro-mechanical brake systems face challenges in miniaturization while maintaining reliable braking performance, particularly in adapting to limited wheel space in vehicles.
Innovation Solution
The electro-mechanical brake apparatus incorporates a planetary gear set reducer with an offset transmission shaft, integrating the brake motor and reducer to reduce axial size and overall volume, thereby achieving miniaturization without compromising braking reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the brake motor and reducer are integrated with an offset transmission shaft, then the axial size and overall volume are reduced, but the structural complexity increases
Solution Approach 1:
The brake motor and reducer are merged into an integrated structure where the rotor of the brake motor serves as the transmission shaft of the reducer. The stator, rotor, and planetary gear set are combined in a single assembly, reducing the need for separate components and connections, thereby reducing overall volume while managing structural complexity through functional integration.
Solution Approach 2:
The planetary gear set is nested within the rotor structure, with the transmission shaft passing through the rotor and connecting to the planet gear. This nesting arrangement allows the reducer components to be housed within the motor assembly, significantly reducing the axial size and overall volume of the electro-mechanical brake system.
2Length of moving object
If the planetary gear set and rotor are combined, then the axial size is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The rotor and planetary gear set are merged into a single integrated assembly, eliminating the need for separate mounting interfaces and reducing the number of precision mating surfaces. The transmission shaft is directly formed as part of the rotor structure, reducing alignment requirements and manufacturing precision demands while achieving compact axial dimensions.
3Volume of moving object
If the transmission shaft axis is offset from the rotor axis, then the miniaturization is achieved, but the reliability requirements increase
Solution Approach 1:
The transmission shaft is deliberately offset from the rotor axis to create an asymmetric configuration that enables compact packaging. The planet gear is positioned at this offset location, and the asymmetric arrangement is designed to distribute loads appropriately, maintaining reliability while achieving miniaturization of the overall system volume.
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 solution enables a compact electro-mechanical brake system that effectively adapts to limited wheel space, ensuring reliable braking performance while reducing the system's volume.
Implementation Method 1
a brake motor, where the brake motor includes a rotor and a stator; and a reducer, where the reducer includes a transmission shaft and a planetary gear set. An axis of the transmission shaft is offset to an axis of the rotor along a radial direction of the brake motor, the rotor is configured to drive the transmission shaft to rotate around the axis of the rotor
Implementation Method 2
the transmission shaft is configured to drive, through a planet gear of the planetary gear set, a sun gear of the planetary gear set to rotate
Implementation Method 3
the electro-mechanical brake apparatus is configured to be fastened to a brake caliper and drive a friction plate to brake a wheel
Data Source
Figure 1~2
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AI summary
This application provides an electro-mechanical brake apparatus with an offset transmission shaft of a reducer, a system, and a vehicle. The electro-mechanical brake apparatus is configured to be fastened to a brake caliper and drive a friction plate to brake a wheel. The electro-mechanical brake apparatus includes a brake motor and the reducer. The brake motor includes a rotor and a stator. The reducer includes the transmission shaft and a planetary gear set. An axis of the transmission shaft is offset to an axis of the rotor along a radial direction of the brake motor, the rotor is configured to drive the transmission shaft to rotate around the axis of the rotor, the transmission shaft is configured to drive, through a planet gear of the planetary gear set, a sun gear of the planetary gear set to rotate, and the sun gear is configured to drive the friction plate through a feed mechanism. In this application, the electro-mechanical brake apparatus uses the rotor to form a structure similar to a planet carrier in the planetary gear set of the reducer, to implement integral integration of the brake motor and the reducer. This reduces an axial size of the electro-mechanical brake apparatus, and implements miniaturization of the electro-mechanical brake apparatus on a premise of ensuring reliable braking of the electro-mechanical brake apparatus.