Belt-Driven Rod Linear Actuator for High-Speed Precision Positioning
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Solution Overview
Problem
Existing linear actuators face challenges in achieving high-speed, precision, and cost-effective operation without the need for compressed air sources, while maintaining lightweight and efficient design.
Innovation Solution
A belt-driven linear actuator system utilizing a timing belt coupled to a piston within a housing, which drives an output rod in reciprocal motion along a longitudinal axis, allowing for high-speed and precise positioning without compressed air, combining the advantages of pneumatic and screw-driven actuators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If screw-driven actuators are used to achieve precision positioning, then manufacturing precision is improved, but speed is limited by critical speed constraints
Solution Approach 1:
The patent replaces the screw-driven mechanical system with a belt-driven system. The timing belt transmits motion directly from the drive pulley to the output rod, eliminating the screw mechanism's critical speed limitations while maintaining precision through the belt's toothed engagement and pulley diameter control.
2Speed
If pneumatic actuators are used to achieve high speed operation, then speed is improved, but precision positioning and control are worsened
Solution Approach 1:
The patent replaces the pneumatic system with an electric motor-driven belt system. The timing belt with its toothed engagement provides precise positional control while the motor provides controlled acceleration and deceleration, achieving both high speed and precision that pneumatic systems cannot simultaneously deliver.
3Adaptability or versatility
If rodless rail and carriage systems are used for longer stroke configurations, then adaptability is improved, but device complexity and cost increase
Solution Approach 1:
The patent creates a universal rod-style actuator design that can achieve various stroke lengths by simply changing the belt length and pulley configuration, while maintaining the same basic rod-style structure. This eliminates the need for different rail and carriage systems for different stroke requirements.
4Device complexity
If traditional belt drive systems are used, then simplicity and cost-effectiveness are improved, but high-speed precision positioning capability is insufficient
Solution Approach 1:
The patent enhances the simple belt drive system by using a timing belt with toothed engagement instead of a smooth belt. This provides positive mechanical engagement that prevents slippage, ensuring precise positioning even at high speeds while maintaining the simplicity and cost-effectiveness of belt-driven operation.
Data Source
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AI summary
An actuator (10) system includes an output rod (20) coupled to a piston member (30) disposed within an actuator housing (14) or cylinder (14). A belt drive (24) is configured to drive the piston (30) or similar coupling member (30) in reciprocal motion within the housing (14), along its longitudinal axis. The opposite end (22) of the output rod (20) is selectively positioned with respect to the exterior of the actuator housing (14) in response to the motion of the piston (30) within the housing (14); e.g., in order to manipulate a tool or workpiece at the opposite (exterior) end (22) of the output rod (20), or to perform another automated machine task.