Multicore Cable Seal Structure Preventing Rubber Plug Shift
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Solution Overview
Problem
Conventional seal structures for multicore cables are prone to shifting under strong force, leading to a decrease in sealing integrity due to the rubber plug being pulled by electrical wires, resulting in compromised contact between the wires and the rubber plug, and between the rubber plug and its housing.
Innovation Solution
A seal structure that includes a multicore cable with a rubber plug fitted around its end, a holder to secure the sheath and prevent shifting, and a cap to apply internal pressure on the rubber plug, ensuring reliable contact and sealing by locking the holder and cap together and using a binding member to press the sheath inward.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rubber plug is used for waterproofing electrical wires, then sealing property is improved, but the rubber plug shifts position when strong force is applied to electrical wires
Solution Approach 1:
The holder is pre-installed on the housing with sheath holding portions and rubber plug holding portions positioned in advance. The sheath is inserted into the holder before the rubber plug is fully positioned, so that the holder is already in place to prevent shifting when force is applied to the wires.
Solution Approach 2:
The holder acts as an intermediary component between the housing and the rubber plug. It has sheath holding portions that secure the sheath and rubber plug holding portions that prevent the rubber plug from shifting, thereby mediating the connection and maintaining sealing reliability.
2Reliability
If the rubber plug is held by intimate contact with electrical wires, then sealing is achieved, but contact intimacy decreases when the rubber plug shifts
Solution Approach 1:
The holder is pre-positioned with rubber plug holding portions that will maintain the rubber plug in the correct position. This preliminary positioning ensures that when the rubber plug is installed, it remains in intimate contact with the electrical wires and the housing, preventing sealing degradation.
Solution Approach 2:
The holder serves as a mediator that maintains the precise positioning of the rubber plug relative to the electrical wires. The rubber plug holding portions ensure continuous intimate contact between the sealing surface of the rubber plug and both the wires and the housing, preserving sealing quality.
3Ease of operation
If the sheath position is not fixed, then assembly is easier, but relative positions of sheath and rubber plug shift
Solution Approach 1:
The holder is pre-installed on the housing with sheath holding portions positioned to receive the sheath. This preliminary setup allows the sheath to be easily inserted while ensuring that its position will be maintained, combining assembly ease with position stability.
Solution Approach 2:
The holder acts as an intermediary structure that facilitates easy sheath insertion through open-ended sheath holding portions, while simultaneously maintaining stable relative positions through the structural connection between the sheath holding portions and the housing.
Data Source
AI summary
A seal structure for a multicore cable includes a multicore cable in which a first electrical wire to a fourth electrical wire are enveloped by a sheath, a rubber plug that is fitted around an end portion of the sheath and has through-holes through which the electrical wires respectively pass, and a holder having a sheath holding portion configured to hold the sheath and suppress shifting of a position of the sheath relative to the multicore cable, in which the holder has locking portion portions configured to hold the rubber plug and suppress movement of the rubber plug in a direction in which the rubber plug comes off from the end portion of the sheath.