Actuator Dual Lubrication System Debris Isolation
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Solution Overview
Problem
Conventional mechanical actuators, such as roller screw actuators, face issues with high-energy demand, wear, and actuator failure due to insufficient lubrication and debris management, leading to reduced performance and lifespan.
Innovation Solution
A mechanical actuator design featuring two isolated lubrication systems for the roller screw and bearing assemblies, with a lubricant impeller and distinct chambers to optimize lubrication, debris management, and load/torque sensing, allowing for efficient operation and extended lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If roller screw actuators are used for heavy loads and continuous-duty conditions, then the actuator can carry heavy loads for thousands of hours, but the actuator becomes susceptible to high-energy demand, wear of individual parts, excess debris, and actuator failure
Solution Approach 1:
The lubrication system is segmented into multiple isolated chambers (first chamber, second chamber, third chamber) that are separated by a partition wall. This segmentation allows different lubrication strategies for different components, preventing debris from one chamber contaminating other chambers, thereby reducing wear and improving reliability while maintaining long operational lifespan
Solution Approach 2:
A lubricant impeller is introduced as an intermediary component to actively circulate lubricant between chambers and deliver it to the roller screw and bearing assemblies. This intermediary mechanism ensures consistent lubrication delivery, reducing wear and preventing failure while maintaining the actuator's ability to operate for thousands of hours under heavy loads
2Reliability
If conventional lubrication systems are used, then the system structure is simple, but the lubrication is insufficient leading to wear and actuator failure
Solution Approach 1:
A lubricant impeller is introduced as an intermediary component to actively circulate lubricant between chambers and deliver it to the roller screw and bearing assemblies. This intermediary mechanism ensures consistent lubrication delivery, reducing wear and preventing failure while maintaining the actuator's ability to operate for thousands of hours under heavy loads
Solution Approach 2:
The lubrication system is segmented into multiple isolated chambers (first chamber, second chamber, third chamber) that are separated by a partition wall. This segmentation allows different lubrication strategies for different components, preventing debris from one chamber contaminating other chambers, thereby reducing wear and improving reliability while maintaining long operational lifespan
3Reliability
If a single lubrication system is used for both screw assembly and bearing assembly, then the device complexity is reduced, but wear debris from one assembly can contaminate the lubrication of the other assembly
Solution Approach 1:
The lubrication system is segmented into multiple isolated chambers (first chamber, second chamber, third chamber) that are separated by a partition wall. This segmentation allows different lubrication strategies for different components, preventing debris from one chamber contaminating other chambers, thereby reducing wear and improving reliability while maintaining long operational lifespan
Solution Approach 2:
The harmful element (debris contamination) is extracted by physically separating the lubrication pathways of the screw assembly and bearing assembly into distinct chambers. This extraction prevents cross-contamination between assemblies, ensuring each maintains clean lubrication for optimal performance and reduced wear
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 actuator achieves performance levels comparable to hydraulic cylinders in terms of duty cycle, precision, and lifespan, with reduced wear and debris-related failures, enabling reliable operation in demanding environments.
Implementation Method 1
The first lubrication system includes a first set of components and is arranged to provide lubrication to the screw assembly. The second lubrication system includes a second set of components and is arranged to provide lubrication to the bearing assembly.
Implementation Method 2
A linear actuator generally transforms rotational motion into linear motion and typically includes a threaded elongated screw or nut component powered by a rotational motion source. The screw or nut movement is converted by a piston or other means to produce linear back and forth cyclic movement of an output member
Implementation Method 3
The nut assembly is arranged to move in either direction along a longitudinal axis of the threaded screw shaft when the threaded screw shaft is in rotational motion, thereby moving the extension tube between an extended position and a retracted position
Implementation Method 4
The bearing assembly is arranged to provide support to at least a portion of a length of the threaded screw shaft
Data Source
AI summary
A mechanical actuator for translating rotational motion to linear motion. The actuator includes a motor, a screw assembly, a bearing assembly, and first and second lubrication systems. The screw assembly includes a housing, a threaded screw shaft disposed within the housing, a nut assembly, and an extension tube. The threaded screw shaft is rotatable by the motor. The nut assembly is arranged to move in either direction along a longitudinal axis of the threaded screw shaft when the threaded screw shaft is in rotational motion, thereby moving the extension tube between an extended position and a retracted position. The bearing assembly is arranged to provide support to at least a portion of a length of the threaded screw shaft. A pathway of the first lubrication system is remote and isolated from a pathway of the second lubrication system.