Electric Vehicle Braking Device With Spherical Bearing
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Solution Overview
Problem
Existing electric vehicle braking devices face issues with axis deviation due to uneven wear of frictional members, leading to sliding movements and reduced transmission efficiency, and require additional components for effective braking, necessitating a compact solution that maintains lubrication and enhances responsiveness.
Innovation Solution
The electric vehicle braking device incorporates a pressing member with a thread portion, a shaft member rotated by an electric motor, and two spherical surface members with a bearing and restraint mechanism to absorb axis deviation, ensuring smooth power transmission and accurate force detection without additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a spherical surface member is used to allow axis deviation, then adaptability to wear is improved, but sliding movement occurs continuously reducing transmission efficiency
Solution Approach 1:
The patent makes the spherical surface member rotatable around the shaft axis dynamically. When axis deviation occurs due to wear, the spherical surface member can rotate to accommodate the deviation while maintaining contact, rather than being fixed in orientation. This dynamic adjustment allows the system to adapt to wear without continuous sliding friction, resolving the contradiction between adaptability and transmission efficiency.
2Loss of energy
If the spherical surface member is restrained from rotating, then power transmission is improved, but ability to absorb axis deviation is reduced
Solution Approach 1:
The patent segments the degrees of freedom of the spherical surface member. Rotation around the shaft axis is permitted to absorb axis deviation, while rotational movement that would affect power transmission is restrained by the restraint member. This segmentation allows the system to selectively allow beneficial motion while preventing harmful motion, resolving the contradiction between power transmission and adaptability.
3Measurement precision
If additional components are added for force detection, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The spherical surface member serves multiple functions: it absorbs axis deviation through rotation, transmits power from the shaft, and enables force detection through strain measurement. By making this single component multi-functional, the patent avoids adding separate force detection components, thus improving measurement precision without significantly increasing device complexity.
4Adaptability or versatility
If the spherical surface member rotates freely, then adaptability to wear is improved, but lubrication effectiveness is reduced
Solution Approach 1:
The spherical surface member rotates dynamically around the shaft axis to accommodate wear-induced axis deviation, but this rotation is controlled and restrained from excessive movement. The restrained rotation maintains adequate lubrication by preventing complete grease depletion, while still providing sufficient adaptability to wear. This dynamic balance resolves the contradiction between wear compensation and lubrication effectiveness.
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 reduces sliding movements, maintains a good lubricating state, improves power transmission efficiency, and enhances responsiveness during sudden braking while allowing compact design and accurate force detection.
Implementation Method 1
a bearing that enables the first spherical surface member to rotate around an axis of rotation of the shaft member
Implementation Method 2
a second spherical surface member that is in sliding contact with the first spherical surface member, and receives a reaction force of the pressing force
Data Source
AI summary
The electric braking device is provided with: a pressing member, which has a thread portion with either an internal thread or an external thread and which applies a pressing force on a frictional member; a shaft member, which is rotated by an electric motor and is threadedly engaged with the thread portion; a first spherical surface member, which is separated from the shaft member, being capable of rotating relative to the shaft member around the axis of rotation of the shaft member, and the end surface of which is a spherical surface; and a second spherical surface member, which is in sliding contact with the spherical surface of the first spherical surface member, receives the reaction force of the pressing force, and is restrained from rotating with respect to the axis of rotation of the shaft member.