Electro-Mechanical Brake Gear Layout for Compact High-Efficiency Drive
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Solution Overview
Problem
Existing electro-mechanical brake apparatuses have large volumes and inefficiencies due to improper selection of transmission mechanisms and arrangement positions, which hinder space-saving and performance optimization.
Innovation Solution
Incorporation of a parallel axis gear system with a motor, planetary gear system, and ball screw, where the motor and ball screw are arranged radially, and the brake and gear systems are axially opposite, with a transition gear connecting them, reducing overall size and enhancing transmission efficiency through precise alignment and elastic springs to maintain gear alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If traditional mechanical transmission mechanisms are used in electro-mechanical brake apparatus, then the structure is simple and response is sensitive, but the volume is large and internal space is not optimized
Solution Approach 1:
The patent implements a nested transmission mechanism where the planetary gear system is positioned inside the ball screw assembly. The planetary input gear is concentric with the ball screw, and the planetary gear system is arranged within the radial space of the ball screw. This nesting arrangement allows multiple transmission components to occupy overlapping spatial volumes, significantly reducing the overall volume of the electro-mechanical brake apparatus while maintaining efficient power transmission from the motor to the brake.
2Volume of moving object
If motor and ball screw are arranged radially at an interval, then radial space is utilized, but the distance between rotation axes increases requiring larger transmission gears
Solution Approach 1:
The planetary gear system is nested within the ball screw's radial space. The planetary input gear is positioned concentrically with the ball screw, and the planetary carrier and rings are arranged within the ball screw's outer diameter. This allows the transmission of rotational power from the motor through the parallel axis gear system and planetary gear system to the ball screw without requiring a large radial distance between the motor shaft and ball screw rotation axes, effectively utilizing the available radial space.
Solution Approach 2:
The planetary gear system acts as an intermediary transmission mechanism between the parallel axis gear system and the ball screw. It transfers power through a compact arrangement where the planetary input gear receives power from the motor gear via the transition gear, and the planetary output gear drives the ball screw. This intermediary system enables efficient power transmission over the required distance while maintaining compact overall dimensions.
3Length of moving object
If parallel axis gear system is introduced to reduce axial size, then axial dimension is reduced, but device complexity increases
Solution Approach 1:
The patent merges the parallel axis gear system with the planetary gear system in a unified transmission arrangement. The motor gear and transition gear are positioned adjacent to the motor in the axial direction, while the planetary input gear is adjacent to the planetary gear system. The transition gear connects the motor gear to the planetary input gear, creating an integrated transmission path that reduces axial dimension while managing complexity through systematic component arrangement and functional integration.
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 results in a compact electro-mechanical brake apparatus with high transmission efficiency, reduced friction, and extended service life, ensuring reliable braking operations while optimizing vehicle internal space.
Implementation Method 1
the planetary input gear is connected to the ball screw in a transmission manner through the planetary gear system, and the ball screw drives, with rotation of the planetary input gear, the brake to move in the axial direction of the ball screw
Implementation Method 2
The ball screw has features of precise transmission and low friction
Implementation Method 3
the motor gear, the transition gear, and the planetary input gear are sequentially arranged adjacent to each other in the radial direction of the motor. A motor shaft of the motor and the motor gear are coaxial for transmission, the transition gear is engaged with both the motor gear and the planetary input gear
Data Source
AI summary
This application provides an electro-mechanical brake apparatus which includes a motor, a parallel axis gear system, a planetary gear system, a ball screw, and a brake. The parallel axis gear system includes a motor gear, a transition gear, and a planetary input gear. The motor and the ball screw are arranged at an interval in a radial direction of the motor. The brake and the parallel axis gear system are arranged opposite to each other in an axial direction of the ball screw. The planetary input gear and the planetary gear system are arranged adjacent to each other in the axial direction of the ball screw, and the motor gear, the transition gear, and the planetary input gear are sequentially arranged adjacent to each other in the radial direction of the motor. The electro-mechanical brake apparatus has features of a small volume and high transmission efficiency.