Linear Actuator Torque Limiter Sprocket Design
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Solution Overview
Problem
Linear actuators in high press load, increased ram speeds, or high precision applications experience internal torque forces higher than desired, leading to potential damage if unattended.
Innovation Solution
A driven sprocket with a torque limiter is integrated into the linear actuator, where the torque limiter is secured to the driven sprocket such that its rotation results in rotation of the limiter, preventing damage by disengaging from the lead screw when an overload torque is sensed, allowing the motor output shaft to continue rotating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the linear actuator operates under high press loads, increased ram speeds, or high precision conditions, then the actuator performance is improved, but internal torque forces exceed desired levels causing potential damage
Solution Approach 1:
The torque limiter acts as an intermediary component between the motor and the linear actuator mechanism. It is coupled to the motor output shaft and engages with the lead screw, allowing it to mediate the torque transmission. When torque exceeds the predetermined limit, the torque limiter disengages from the lead screw, preventing excessive torque forces from damaging the actuator while allowing normal operation under acceptable torque conditions.
2Reliability
If a torque limiter is added to protect the linear actuator, then damage prevention is achieved, but device complexity increases
Solution Approach 1:
The torque limiter is designed to automatically monitor and protect the linear actuator without requiring external intervention. It self-regulates by engaging and disengaging from the lead screw based on torque conditions, eliminating the need for external torque sensing systems or complex control mechanisms. This self-service approach provides reliable protection while minimizing added complexity.
Data Source
AI summary
A driven sprocket configured for rotational use in a linear actuator is provided. The driven sprocket includes an outer circumferential surface extending radially from a main body. The outer circumferential surface has a plurality of spaced apart gear teeth configured to engage corresponding structures of a drive belt. An upper rim and a lower rim bound the outer circumferential surface and are configured to maintain a drive belt in an engaged position with the gear teeth. A plurality of internal apertures extend therethrough and are configured to receive portions of a lead screw and portions of a torque limiter. A plurality of spaced apart apertures are configured to receive fasteners configured to secure the torque limiter to the driven sprocket in a manner such that rotation of the driven sprocket results in rotation of the torque limiter.