Slide Actuator Spring Retainer Disturbance Control
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Solution Overview
Problem
Conventional slide actuators experience displacement and increased sliding friction due to disturbances, leading to control deviations and reduced durability, as the retainer and movable portions are displaced, causing contact with the fixed portion and resulting in friction and wear.
Innovation Solution
Incorporating spring elements between the retainer and the fixed portion, and between the movable portion and the fixed portion, with specific spring constants to suppress displacement and maintain a constant distance between balls, thereby reducing friction and wear by attenuating control deviations and maintaining positional accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the retainer and movable portion are rigidly connected without spring elements, then the structure is simple and durable, but displacement occurs under disturbance causing increased sliding friction and control deviation
Solution Approach 1:
Spring elements (first and second structural bodies) are pre-installed between the retainer and fixed portion, and between the movable portion and fixed portion, to provide cushioning force before disturbance occurs. This beforehand cushioning prevents displacement and contact with the fixed portion wall, eliminating sliding friction and maintaining position control accuracy without requiring complex active control systems.
2Manufacturing precision
If spring elements are added to suppress displacement, then position control accuracy improves, but device complexity increases
Solution Approach 1:
The spring constants of the first and second structural bodies are specifically designed and optimized to provide the exact cushioning force needed to prevent retainer and movable portion displacement under expected disturbance conditions. By carefully selecting spring parameters, the system achieves high positional accuracy while keeping the structure simple and the number of components minimal.
3Stability of the object's composition
If the retainer contacts the wall portion to stop movement, then the retainer position is stabilized, but sliding friction increases and wear occurs
Solution Approach 1:
The spring elements apply a preliminary cushioning force in the opposite direction to potential disturbance forces, preventing the retainer and movable portion from displacing and contacting the wall portion in the first place. This preliminary anti-action eliminates the harmful sliding friction and wear that would occur during contact-based stabilization.
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 effectively reduces sliding friction and wear, enhances durability, and improves position control accuracy by minimizing displacement and contact with the fixed portion, even under strong disturbances, by using spring elements to balance and correct positional deviations.
Implementation Method 1
a first structural body (14) having spring property and connected between the wall portion (2c) and the retainer (6)
Implementation Method 2
a second structural body (15) having spring property and connected between the wall portion (2d) and the movable member (3)
Data Source
AI summary
A slide actuator according to the present invention includes: a fixed member; a movable member movable in a predetermined direction with respect to the fixed member; a wall portion of the fixed member disposed in a moving direction of the movable member; a plurality of balls interposed between the fixed member and the movable member and configured to movably support the movable member; a retainer configured to maintain a constant distance between the respective balls; a retainer spring connected between the wall portion and the retainer; and a movable portion spring connected between the movable member and the wall portion, in which the retainer spring is disposed so as to suppress a displacement of the retainer in the moving direction, and the movable portion spring is disposed so as to suppress a displacement of the movable member in the moving direction.