Rotary Joint Cable Cassette for Strain-Free Motion
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Solution Overview
Problem
Conventional cable management systems in rotary joints fail to adequately protect conductors from mechanical strain, electromagnetic interference, and physical damage in harsh environments, leading to premature failure and performance issues.
Innovation Solution
A cable management system featuring a rotary housing with a cable cassette that winds cables around a guide as the joint rotates, minimizing mechanical stress and providing internal shielding, while allowing a larger range of motion in a smaller package.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If cables are packaged externally with a large joint loop to accommodate the entire range of motion, then the cables can move freely with the joint, but this creates a snagging hazard and kinematic constraints
Solution Approach 1:
The cable management system nests the cable reel inside a protective housing, with the cable wound around the reel in a compact configuration. This nested structure allows the joint to achieve a large range of motion while the cable remains contained, eliminating the external loop that causes snagging hazards.
Solution Approach 2:
Instead of allowing the cable to form a large external loop in three-dimensional space, the system winds the cable around a reel, transforming the cable's path into a compact two-dimensional spiral pattern on the reel surface. This dimensional transformation reduces the spatial footprint and eliminates snagging hazards while maintaining range of motion.
2Ease of operation
If cables are subject to external mechanical loading from rotating joint, then the joint can rotate, but the conductors in the cable may break due to tension, bending strain, or fatigue
Solution Approach 1:
The cable reel acts as an intermediary mechanism between the rotating joint and the cable conductors. As the joint rotates, the reel winds or unwinds the cable, mediating the mechanical motion and preventing direct tension and bending strains from being applied to the conductors. This protects the conductors from fatigue and breakage while enabling joint rotation.
Solution Approach 2:
The system provides beforehand cushioning by maintaining proper cable tension and routing through the reel mechanism, preventing excessive bending strains and mechanical loads from reaching the conductors before they can cause damage. The reel ensures the cable is always properly supported and routed, cushioning the conductors against harmful mechanical stresses.
3Strength
If the cable bundle is made stiff to support mechanical loads, then the conductors are protected, but the stiffness affects performance of the joint
Solution Approach 1:
The cable reel serves as an intermediary that assumes the mechanical support function, allowing the cable bundle to remain flexible for optimal joint performance while the reel provides the necessary mechanical strength and load-bearing capability through its winding mechanism.
Data Source
Figure 1
Figure 2A~2B
Figure 3A
AI summary
Provided is a system for cable management in a rotary joint. The system includes a rotary housing that rotates about a rotational axis relative to a stationary housing. The stationary housing has a stationary cavity for allowing a cable to pass through. The system includes a cable management system for managing one or more cables. The cable management system includes a cable cassette attached to the stationary housing, wherein the cable cassette winds the cable around the cable cassette as the rotary joint rotates.