Rubber Plug Seal Holes with Offset Lips for Low Insertion Resistance
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Solution Overview
Problem
Conventional rubber plugs with seal holes arranged at the same phase positions in forward and backward directions experience high insertion resistance due to compressive forces between lips, making it difficult to insert terminal fittings.
Innovation Solution
The rubber plug design features first and second seal holes with lips arranged in a specific configuration where the second lips are positioned at opposite sides relative to the inserting direction, allowing the first lips to deform without interference from adjacent second lips, reducing insertion resistance and ensuring easy insertion of terminal fittings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If lips of adjacent seal holes are arranged at the same phase positions, then sealing structure is compact, but insertion resistance increases due to compressive forces between lips
Solution Approach 1:
The seal holes are segmented into first and second seal holes with distinct lip arrangements. The first seal hole has lips at one phase position while the second seal hole has lips at a different phase position, dividing the sealing function into separate zones that do not interfere with each other during insertion.
Solution Approach 2:
The lips of adjacent seal holes are arranged asymmetrically in terms of phase position. The first lips and second lips are offset from each other, creating an asymmetric configuration that allows one set of lips to accommodate the deformation of the other during insertion, reducing mutual compressive forces.
2Ease of operation
If lips are arranged to reduce insertion resistance, then insertion ease improves, but sealing effectiveness may be compromised
Solution Approach 1:
The second lips are pre-positioned to create a valley structure that anticipates and accommodates the deformation of the first lips during insertion. This preliminary configuration of the valley space ensures that when the first lips deform, they have room to do so without being compressed by the second lips, maintaining both ease of insertion and sealing effectiveness.
Solution Approach 2:
Different regions of the seal structure have different lip phase positions tailored to their specific functions. The first seal hole region has lips configured for primary sealing, while the second seal hole region has lips configured to accommodate deformation, creating local quality variations that optimize both insertion ease and sealing reliability in different zones.
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
This configuration facilitates easier insertion of terminal fittings into the rubber plug while maintaining effective sealing without excessively lengthening the seal holes, ensuring good sealing performance.
Implementation Method 1
The first lips are deformed compressively when the terminal fitting is inserted into the first seal hole
Implementation Method 2
the lips are held resiliently in close contact with the outer peripheral surface of the wire to provide sealing around the wire
Data Source
AI summary
A rubber plug (10) has a plug main body (11) with at least first and second seal holes (13A, 13B) penetrating therethrough. Front and rear first lips (15A) are formed on the inner peripheral surface of the first seal hole (13A) and a valley (16) is defined between the first lips (15A). Front and rear second lips (15B) are formed on the inner peripheral surface of the second seal hole (13B) and a valley (17) is defined between the second lips (15B). The lips (15A, 15B) are disposed so that tips of the first lips (15A) align with the valley (17) of the second seal hole (13B). As a result, the first lips (15A) do not add to compressive forces exerted by the second lips (15B) when a wire is inserted into the second seal hole (13B).