Wire Terminal Oblique Extending Portion Waterproofing
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Solution Overview
Problem
Conventional waterproof structures in wire terminals are prone to water intrusion due to the displacement of water cut-off members during crimping, as they are pushed out by the tightening force of the barrel pieces.
Innovation Solution
A wire terminal configuration with an oblique extending portion is introduced, which reduces the rearward outflow of the water cut-off member by providing a space between the insulation coating and the oblique extending portion, ensuring the water cut-off member remains in place and prevents water intrusion into the terminal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a water cut-off member is stuck to inner wall surfaces of the barrel pieces to form a water cut-off region, then water intrusion into between the wire connecting portion and core is prevented, but the water cut-off member is pushed out from the end of terminal connecting portion by tightening force in crimping
Solution Approach 1:
The oblique extending portion is provided in advance on the barrel piece before crimping. This preliminary structural feature prevents the water cut-off member from being pushed out during the subsequent crimping process by creating a physical barrier that redirects the tightening force, thereby maintaining the water cut-off member's position stability while preserving waterproof performance
Solution Approach 2:
The oblique extending portion acts as an intermediary element between the barrel piece and the water cut-off member. It mediates the tightening force during crimping by providing an inclined surface that redirects the force away from the water cut-off member, preventing its displacement while still allowing effective crimping of the wire connecting portion
2Strength
If the inner peripheral surface of coating crimping portion is closed over entire circumference by second barrel piece winding around, then structural integrity is improved, but water cut-off member is easily pushed out rearward during crimping
Solution Approach 1:
The oblique extending portion is provided locally at a specific position on the barrel piece where the water cut-off member is most susceptible to displacement. This localized structural feature addresses the specific problem of rearward pushing without compromising the overall structural integrity provided by the closed inner peripheral surface
Solution Approach 2:
The oblique extending portion introduces an asymmetric feature to the otherwise symmetric closed structure of the coating crimping portion. This asymmetric element creates a directional force redistribution during crimping that prevents symmetric displacement of the water cut-off member, allowing the closed circumference structure to maintain its strength
Data Source
AI summary
A wire with terminal WT1 is provided with a wire 2 including a core 2B and an insulation coating 2C covering around the core 2B, and a terminal 1 including a coating crimping portion 50 crimped to the insulation coating 2C. The wire 2 is pulled out rearward from the terminal 1. A water cut-off member 60 for suppressing liquid intrusion into the core 2B is disposed between an inner peripheral surface 20A of the coating crimping portion 50 and an outer peripheral surface 2A of the insulation coating 2C. The coating crimping portion 50 is provided with an oblique extending portion 70 for reducing the outflow of the water cut-off member 60 to outside due to crimping.