Cable Bushing Grommet Structure for Watertight Sealing Under Cable Bending
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Solution Overview
Problem
Existing grommets for sealing cables in cable bushings are prone to water ingress due to asymmetrical compression from excessive cable bending and require precise orientation and installation to ensure watertightness, making them difficult to assemble correctly and prone to human errors.
Innovation Solution
A grommet design with an inner and outer sealing portion connected only at one end, featuring a chamfer for easier cable insertion and a flange for defined positioning, along with ribs for enhanced sealing and stability, ensures effective sealing regardless of cable bending and simplifies the installation process by preventing incorrect cable insertion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cable is pushed through the grommet, then the cable is sealed in the grommet body, but material around the opening is pulled into the camera and may cause leakage
Solution Approach 1:
The grommet is divided into two separate sealing portions (inner and outer) that are connected only at one end, allowing independent sealing actions at the cable opening and grommet body interface without interfering with each other
2Adaptability or versatility
If the cable is bent excessively to lead it to a connection, then the cable can reach the connection point, but asymmetrical compression of the grommet occurs leading to water ingress
Solution Approach 1:
By separating the inner sealing portion from the outer sealing portion, the grommet allows the cable to bend and move independently without transmitting asymmetric forces to the sealing surfaces, maintaining watertightness despite cable routing requirements
Solution Approach 2:
The decoupled structure changes the mechanical parameters of the sealing portions, allowing them to maintain constant compression and sealing pressure regardless of cable position or bending, ensuring consistent watertightness
3Reliability
If the grommet requires precise orientation for correct cable insertion, then sealing function is maintained, but assembly errors increase and installation becomes difficult
Solution Approach 1:
The grommet features an asymmetric design with the inner and outer sealing portions connected only at one end, creating a unique insertion orientation that is visually and physically distinct, making correct installation intuitive and preventing incorrect assembly
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
The invention relates to a grommet (1) for sealing a cable (2) in a cable bushing (4), a grommet assembly (1, 2, 4) for a camera, a camera including the grommet assembly (1, 2, 4), and a method for mounting the grommet (1) in the cable bushing (4). The grommet (1) for sealing a cable (2) in a cable bushing (4) comprises a grommet body (1A) having an inner sealing portion (1b) for sealing the cable (2) in the grommet body (1A) and an outer sealing portion (1c) for sealing the grommet body (1A) in the cable bushing (4), wherein the inner sealing portion (1b) and the outer sealing portion (1c) are connected at a first outer axial end (1A1) of the grommet body (1A), and a cavity (1f) is disposed between the inner sealing portion (1b) and the outer sealing portion (1c).