Waterproof Plug With Protruded Claw Sections For Wire Gap Prevention
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Solution Overview
Problem
Conventional waterproof plugs face issues with gaps between bent electric wires and resin members, leading to reduced waterproofness due to decreased rubber filling factors when trying to avoid these gaps.
Innovation Solution
A waterproof plug design featuring equally spaced protruded claw sections and longitudinal grooves on the inner circumference of a cylindrical resin member, which reduces the movement of the electric wire and maintains seal pressure, thereby enhancing waterproofness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bending range of the electric wire is decreased to avoid gaps, then gap prevention is improved, but waterproofness deteriorates due to decreased rubber filling factor
Solution Approach 1:
The resin member provides localized support at the bending side through increased thickness, allowing the electric wire to bend within an adequate range while preventing gaps at the critical bending position. This local reinforcement does not restrict the overall bending range of the wire.
2Reliability
If the resin member is made thinner to maintain rubber filling factor, then waterproofness is improved, but bending range of electric wire is restricted
Solution Approach 1:
The resin member is thinner at non-bending positions to maintain rubber filling factor and waterproofness, while being locally thickened at the bending side to provide necessary support for adequate bending range.
Data Source
Figure 1(a)~1(d)
Figure 2(a)~2(b)
Figure 3(a)~3(b)
AI summary
A waterproof plug capable of improving waterproofness is provided. In a waterproof plug 1, the outside and the inside of a cylindrical resin member 2 are provided with a sealing section 3 including an outer circumference section 30 which intimately contacts to an inner wall face of a cavity 41 existing within a connector housing 4, and an inner circumference section 33 which intimately contacts to an outer circumference face of an electric wire 5, the electric wire 5 pulled out of the cavity 41 being inserted into the inner circumference section 33, and a contacting section 21 a of the resin member 2 is brought into contact with an inner wall face of an edge section 41 a of the connector housing 4 in which the electric wire 5 is pulled out of the cavity 41. The resin member 2 is provided with a plurality of protruded claw sections 211 protruding toward the side of the inner circumference section 33 along the circumference direction.