Ball Screw Electromechanical Brake Automatic Wear Compensation
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Solution Overview
Problem
Electromechanical brakes using non-circulation type ball screws face challenges with ball position displacement due to pad abrasion, requiring manual compensation, which complicates continuous operation.
Innovation Solution
Incorporating a ball retainer with a torsion spring that automatically compensates for ball position displacement by using the restoring force of the spring, reducing frictional resistance and improving durability, allowing for continuous operation without manual adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a non-circulation type ball screw is used to reduce packaging size, then the external diameter of the nut is decreased, but the balls gradually move due to pad abrasion requiring manual position restoration
Solution Approach 1:
The ball retainer with elastic member enables the ball screw mechanism to automatically restore ball positions without manual intervention. The elastic member stores and releases energy to push balls back to their initial positions after pad abrasion occurs, making the system self-maintaining.
Solution Approach 2:
The invention changes the physical state of the ball positioning system by introducing an elastic member that dynamically adjusts ball positions. This allows the compact non-circulation ball screw to automatically compensate for wear-induced position changes without increasing overall size.
2Duration of action of moving object
If a circulation type ball screw is used for long continuous operation, then the operation section is extended, but the external diameter of the nut increases requiring larger packaging space
Solution Approach 1:
The automatic ball restoration mechanism allows the non-circulation ball screw to achieve continuous operation capability without requiring the larger circulation type design. The elastic member continuously resets ball positions, enabling indefinite operation within the compact nut structure.
Solution Approach 2:
The elastic member pre-stores energy in a compressed state during the braking operation, and automatically releases this energy to restore ball positions when needed, enabling continuous operation without manual intervention or increased size.
3Measurement precision
If manual ball position compensation is performed regularly, then ball position accuracy is maintained, but operational efficiency is reduced due to maintenance interruptions
Solution Approach 1:
The system automatically maintains ball position accuracy through the elastic member's restoring force, eliminating the need for manual compensation operations and maintaining continuous productivity without sacrificing positioning precision.
Solution Approach 2:
The automatic restoration mechanism ensures continuous operation without interruptions for manual ball position adjustment. The elastic member continuously maintains ball positioning throughout the operational cycle, preventing downtime and maintaining high productivity.
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 enhances operational efficiency, reduces size for better packaging, and automatically compensates for ball position changes due to pad abrasion, ensuring continuous brake functionality without separate compensation for pad wear.
Implementation Method 1
a torsion spring having a first side which is mounted to the nut member, and a ball retainer which is mounted at a second side of the torsion spring
Implementation Method 2
In the screw-nut structure, there may be applied a ball screw in which balls are interposed between a nut and a screw, wherein force is transmitted through the balls to reduce frictional resistance
Data Source
AI summary
An electromechanical brake may include a drive device for the electromechanical brake to which a non-circulation type ball screw is applied, and may automatically compensate for a position movement amount of a ball caused by pad abrasion, wherein the electromechanical brake includes a drive device, that is, an electromechanical brake with a non-circulation type ball screw, in which pad abrasion is compensated by the ball screw, a torsion spring, and a ball retainer mounted at the other side of the torsion spring.