Cable Cylinder Transmission With Offset Nut Anchorage
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Solution Overview
Problem
Cable actuators with screw-and-nut assemblies face challenges in manufacturing and maintenance due to complex and costly crimping processes, which can damage components and require additional backlash prevention systems, making them expensive and difficult to assemble, especially in small sizes.
Innovation Solution
A cable actuator design with multiple cable strands connected to a nut through crimps blocked by holes, allowing easy connection and disconnection without risk of damage, and utilizing a configuration where cable strands form continuous segments through multiple holes for uniform force distribution and improved reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If both cable strands are connected to the nut at the same point by crimping, then loads are distributed symmetrically, but the connection is awkward to make and undo, and the nut or screw may be damaged during crimping
Solution Approach 1:
The patent divides the cable connection system into multiple separate connection points on the nut. Instead of crimping both cable strands at a single point, the cables are connected at different locations on the nut body, which simplifies the crimping process and reduces the risk of damaging the nut or screw while maintaining symmetrical load distribution through the segmented attachment points.
2Reliability
If crimping is used to connect cable strands to the nut, then connection is achieved, but additional prestress blocking systems are needed to prevent backlash, making assembly complicated
Solution Approach 1:
The patent extracts and eliminates the complex prestress blocking system from the cable connection assembly. By using a simplified crimping method with multiple connection points on the nut, the design achieves reliable connections without requiring additional backlash prevention mechanisms, thereby reducing assembly complexity while maintaining connection reliability.
3Reliability
If a single-point crimp connection is used, then cable strands are connected to the nut, but manufacturing and maintenance costs increase due to complex procedures and potential damage
Solution Approach 1:
The patent segments the cable connection into multiple attachment points on the nut body. This segmentation allows for simpler, less costly crimping procedures that reduce the risk of damaging expensive components during assembly, thereby lowering manufacturing and maintenance costs while maintaining connection stability through the distributed attachment configuration.
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
This design reduces manufacturing costs, simplifies assembly, and enhances connection reliability while maintaining uniform force distribution and compensating for tilting, resulting in a more efficient and cost-effective cable actuator.
Implementation Method 1
a screw mounted on a frame and extending along a first axis, a nut co-operating with the screw... relative rotation between the screw and the nut causes the screw to be moved axially
Implementation Method 2
A first cable strand and a second cable strand are coupled directly to the nut and extend on a first side of a first plane orthogonal to the first axis and containing the nut
Data Source
AI summary
An actuator (100) comprising:a frame (20);a screw (2) mounted on the frame;a nut (4) co-operating with the screw (2);a motor (3) arranged to drive the screw (2) in rotation;a first cable strand (6.1) and a second cable strand (9.1) coupled to the nut (4) and extending on a first side (8.1) of a first plane (P1);a third cable strand (6.4) and a fourth cable strand (9.4) coupled to the nut (4) and extending on a second side (8.2) of the first plane (P1);the first cable strand (6.1) and the second cable strand (9.1) extending in a second plane (P2);the third cable strand (6.4) and the fourth cable strand (9.4) extending in a third plane (P3); andthe second plane (P2) and the third plane (P3) being distinct.