Linear Actuator Gap Compensating Unit Offset Correction
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Solution Overview
Problem
Conventional linear actuators face inaccuracies in converting rotary motion to linear motion due to process capability and geometric tolerances, with limited offset compensation by ball and ball retainer gaps, affecting motion accuracy.
Innovation Solution
A linear actuator design incorporating a case, actuating unit, and gap compensating unit with elastic joints and units that reciprocate to provide elasticity, compensating for offset and maintaining linearity, featuring a base with apertures and joints that prevent self-rotation and enhance stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional linear bearing with ball and ball retainer is used to support the actuating unit, then the linear motion is guided and supported, but the offset compensation is too limited to improve the accuracy during linear motion
Solution Approach 1:
The gap compensating unit is divided into multiple segments including a base, multiple apertures, multiple joints, and multiple elastic units. Each aperture contains a joint and an elastic unit that can independently compensate for local gaps and offsets, allowing distributed correction across the linear motion path rather than relying on a single compensation mechanism.
Solution Approach 2:
The elastic units (springs) change their compression state dynamically during linear motion to compensate for gaps. The system adjusts the effective gap size by varying the compression of elastic units, thereby changing the physical parameters of the transmission interface to maintain accuracy despite manufacturing tolerances.
2Productivity
If the nut rotates freely during operation, then the actuating unit can reciprocate, but inappropriate rotation occurs reducing conversion efficiency
Solution Approach 1:
The gap compensating unit features asymmetric aperture arrangements with different numbers of apertures on different sides (e.g., three apertures on one side, two on the other). This asymmetric configuration creates corresponding asymmetric reaction forces through the elastic units that effectively prevent rotational movement while allowing linear reciprocation, thereby improving conversion efficiency.
Solution Approach 2:
The joints (balls or pillars) received in the apertures act as intermediary elements between the gap compensating unit and the actuating unit. These intermediaries transmit forces and provide the mechanical constraint necessary to prevent inappropriate rotation while maintaining smooth linear motion.
3Measurement precision
If rigid connections are used between components, then structural stability is achieved, but offset during linear motion cannot be compensated
Solution Approach 1:
The elastic units (springs) introduce dynamic flexibility to the connection between the gap compensating unit and the actuating unit. This dynamic element allows the system to adapt to manufacturing gaps and offsets by compressing or extending the springs, while the overall structure remains stable due to the constrained movement paths defined by the apertures and joints.
Solution Approach 2:
The elastic units are pre-installed in the apertures to provide beforehand cushioning for potential gaps and offsets. This prior cushioning mechanism ensures that when the actuating unit moves, any manufacturing inaccuracies are already compensated for by the pre-positioned elastic elements, maintaining both precision and stability.
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 compensates for larger offsets, enhances fabrication with modularized units, and increases conversion efficiency by preventing inappropriate nut rotation, thereby improving the accuracy and stability of linear motion.
Implementation Method 1
the gap compensating unit with the joints and the elastic units to provide the elasticity thereby compensating the offset during the linear motion
Data Source
AI summary
A linear actuator including the gap compensating unit with the joints and the elastic units to provide the elasticity thereby compensating the offset during the linear motion and maintaining the stability and linearity.