Cable Joint Protrusion Design for Sliding Stability
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Solution Overview
Problem
Cable joints with protrusions to reduce sliding resistance are prone to breaking under orthogonal loads, limiting weight reduction and miniaturization, especially when cables are routed non-planarly.
Innovation Solution
A cable joint design featuring a joint piece with a protrusion on its main sliding surface that protrudes orthogonally, matching the position of cable lead-out parts, ensuring a stable sliding interface and distributing loads effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a protrusion is formed on the main sliding surfaces of the joint piece and joint case to reduce sliding resistance, then the sliding property is improved, but the protrusion is easily broken under orthogonal loads
Solution Approach 1:
The patent applies local quality by making the joint piece side main sliding surface have a protrusion while keeping the joint case side main sliding surface flat. This asymmetric local modification allows the protrusion to reduce sliding resistance at the joint piece side without requiring corresponding protrusions on the joint case side, thereby reducing the number of protrusions that could break under load.
Solution Approach 2:
Instead of forming protrusions on both sliding surfaces as in conventional designs, the patent inverts the approach by forming the protrusion only on the joint piece side main sliding surface and keeping the joint case side flat. This inversion reduces the number of vulnerable protrusions while maintaining the sliding reduction benefit.
2Strength
If the protrusion is thickened to prevent breakage, then the strength is improved, but weight reduction and miniaturization are limited
Solution Approach 1:
The patent applies local quality by concentrating the sliding reduction function on the joint piece side only, allowing the protrusion to be thin and lightweight. The flat joint case side provides a stable bearing surface that compensates for the reduced protrusion thickness, enabling weight reduction while maintaining durability.
3Ease of operation
If protrusions are formed on both sliding surfaces to reduce sliding resistance, then the sliding property is improved, but the device complexity increases
Solution Approach 1:
The patent inverts the conventional approach of having protrusions on both surfaces by implementing an asymmetric design where only the joint piece side has a protrusion and the joint case side has a flat surface. This simplification reduces manufacturing complexity and the number of components that need to be precisely matched.
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 design enhances the sliding properties and durability of the joint piece, preventing breakage and allowing for weight reduction and miniaturization while maintaining effective load distribution.
Implementation Method 1
a protrusion part on a joint piece side main sliding surface, on which the joint case slides, the protrusion part protrudes toward the joint case side main sliding surface in a direction orthogonal to the joint case side main sliding surface
Data Source
AI summary
To provide a cable joint including a joint piece which has an good sliding property and is hardly broken. The cable joint includes a joint case 10 and a joint piece 50. The joint piece 50 is provided with a locking part of a cable end and a cable lead-out groove 56. A joint case side main sliding surface 21a is formed flat, and a protrusion part 61 is provided on a joint piece side main sliding surface 60. The protrusion part protrudes toward the main sliding surfaces 60, 21a in a direction orthogonal to the main sliding surfaces. An apex part 61a of the protrusion part is located at a position corresponding to the cable lead-out groove 56 in the direction orthogonal to the main sliding surfaces.