Load-Responsive Grommet Structure for Pull-Out Leak Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing grommets struggle to maintain a secure hold on the peripheral part of a through hole, especially when the wiring material is accidentally pulled into the wrong space, leading to potential liquid leakage and disengagement.
Innovation Solution
The grommet features an annular engagement body with an engagement groove, a bellows-like first cylindrical body, a cylindrical second cylindrical body, partition walls, and projection parts that deform to enhance the pressing force on the engagement body, ensuring a secure fit even under loaded conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the grommet uses a simple engagement structure with the main body engaged with the through hole peripheral part, then the device complexity is reduced and ease of manufacture is improved, but the holding force on the peripheral part is insufficient when wiring material is pulled
Solution Approach 1:
The engagement body is designed to dynamically change its engagement state with the through hole peripheral part. In the no-load state, the engagement groove maintains normal engagement. In the loaded state when wiring material is pulled, the engagement body deforms to increase pressing force on the peripheral part, providing enhanced holding force dynamically when needed.
Solution Approach 2:
The engagement body is divided into functional segments: the engagement groove for initial engagement, the pressing force generation mechanism with deformation capability, and the interaction with the first cylindrical body. This segmentation allows each part to perform its specific function while collectively providing enhanced holding force without excessive overall complexity.
2Reliability
If the grommet maintains a secure engaged state even when wiring material is pulled, then the reliability is improved, but the device complexity increases due to additional engagement mechanisms
Solution Approach 1:
The engagement body utilizes the pulling force of the wiring material itself to generate enhanced pressing force through its deformation mechanism. The first cylindrical body's interaction with the engagement body creates a self-reinforcing effect where the load automatically increases the engagement strength, eliminating the need for separate locking mechanisms and maintaining reliability without excessive complexity.
3Force
If the projection part is disposed close to the engagement groove to maximize pressing force, then the holding force is improved, but the first cylindrical body may interfere with the engagement groove during deformation
Solution Approach 1:
The projection part is positioned at a specific location on the first partition wall that optimizes the balance between generating pressing force and avoiding interference. The local geometric configuration ensures that during deformation, the projection part effectively presses against the engagement groove bottom without the first cylindrical body interfering, achieving both force maximization and smooth operation.
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 design significantly improves the holding force of the grommet on the peripheral part of the through hole, preventing disengagement and maintaining liquid-proof integrity, even when the wiring material is pulled into the second space.
Implementation Method 1
the first cylindrical body and the first partition wall are deformed while relatively moving with respect to the engagement body in a pulling direction in a loaded state
Implementation Method 2
causes pressing force to act on the inner peripheral surface of the engagement body from the end part on the second partition wall side due to displacement caused by deformation
Implementation Method 3
the first cylindrical body causes assisting force for enhancing the pressing force of the projection part to act on an external wall of the first partition wall in the loaded state
Data Source
AI summary
A grommet includes: an engagement body; a first cylindrical body; a second cylindrical body; a first partition wall; a second partition wall; a holding part fixed together with a wiring material; and a pair of projection parts projected from an inner wall of the first partition wall. The first cylindrical body and the first partition wall are deformed in a pulling direction of the wiring material in a loaded state. An end part of the projection part is disposed, to be opposed to an inner peripheral surface on an inner side in the radial direction with respect to a groove bottom of an engagement groove of the engagement body, and acts pressing force on an inner peripheral surface of the engagement body from an end part due to displacement caused by deformation from an inner peripheral part side of the first partition wall in the loaded state.