Linear Actuator Quick-Release Mechanism for Rapid Gravity Return
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Solution Overview
Problem
Linear actuators face challenges in quickly returning to their initial position due to inferior motor and screw contraction speed, necessitating a quick-release mechanism to address this issue.
Innovation Solution
A mechanical clutch assembly with a tubular coupler, spring, and rotatable involute cam is implemented to disconnect power between the motor and screw, allowing the actuator to return to its initial position under gravity, and includes a remote monitoring system for position detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the linear actuator uses motor and screw for contraction, then the structure is simple and reliable, but the contraction speed is slow and cannot return to initial position quickly
Solution Approach 1:
The patent applies the dynamics principle by implementing a quick-release mechanism that can dynamically switch between two states: engaged state where the transmission shaft and linking shaft are connected for normal motor-driven operation, and disengaged state where they are separated to allow gravity-driven rapid return. The involute cam and spring assembly enable this dynamic state transition, allowing the actuator to adapt its mechanical connection status based on operational requirements.
Solution Approach 2:
The patent uses the quick-release mechanism as an intermediary device between the motor assembly and screw assembly. This intermediary component (comprising the coupler, involute cam, and spring) mediates the power transmission, allowing selective engagement and disengagement. When disengaged, it permits the screw to return under gravity without motor power, solving the contradiction between structural simplicity and rapid return capability.
2Loss of time
If the quick-release mechanism is added to enable immediate return, then the contraction speed is improved, but the device complexity increases
Solution Approach 1:
The patent applies the anti-weight principle by utilizing gravity as a counterbalancing force to the motor-driven extension. The quick-release mechanism enables the screw and transmission components to be disconnected from motor power, allowing gravity to act as the driving force for rapid return to the initial position. This eliminates the need for motor-powered retraction and significantly reduces return time.
Solution Approach 2:
The spring-loaded quick-release mechanism is designed to automatically engage and disengage based on operational conditions. The spring provides the necessary force to maintain engagement during normal operation and enables automatic disengagement when the involute cam actuates the mechanism, reducing the need for complex control systems and manual intervention.
3Reliability
If the transmission shaft and linking shaft are permanently connected, then the power transmission is reliable, but the quick return function cannot be achieved
Solution Approach 1:
The patent applies segmentation by dividing the power transmission path into separable segments: the transmission shaft from the motor, the quick-release mechanism as an intermediate segment, and the linking shaft to the screw. This segmentation allows the middle segment (quick-release mechanism) to be selectively engaged or disengaged, maintaining reliable power transmission when needed while enabling operational flexibility for rapid return when required.
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
Enables immediate return to the initial position without power assistance and allows remote monitoring of the actuator's position, enhancing safety and convenience.
Implementation Method 1
a spring, externally abutting against the coupler at an outer surface of the flange so as to normally push along an axial direction of the coupler
Implementation Method 2
a rotatable involute cam, having a small-diameter segment and a large-diameter segment for connecting an inner surface of the flange, so that when rotated, the involute cam displaces the coupler to press or release the spring
Implementation Method 3
The quick-release mechanism allows the unpowered, loaded linear actuator to immediately return to its initial position by gravity
Data Source
AI summary
A linear actuator with a quick-release mechanism allows the unpowered, loaded linear actuator to immediately return to its initial position by operating a rotatable involute cam of the quick-release mechanism. The quick-release mechanism is connected with a remote monitoring system so the current position of the linear actuator can be detected from a distant place.