Sensor Device Harness Draw-Out Compression Seal
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Solution Overview
Problem
Existing sensor devices require expensive waterproof connectors when used in vehicles or outdoors, as the connector fitting portion is typically exposed, leading to potential water ingress and reliability issues.
Innovation Solution
A sensor device design featuring a housing with a harness draw-out portion that includes a first and second draw-out portion to compress the harness, ensuring liquid tightness without the need for a waterproof connector, using a bush with an O-ring and a nail portion to secure the harness and prevent water ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a connector fitting portion is provided outside the housing, then the sensor device can be easily connected to an external controller, but water ingress may occur and expensive waterproof connectors are required
Solution Approach 1:
The patent merges the connector function with the housing structure by providing a connector fitting portion integrated into the housing body. This eliminates the need for separate waterproof connectors while maintaining both connection functionality and waterproof performance through the unified structure.
Solution Approach 2:
The patent introduces a waterproof seal as an intermediary element between the connector fitting portion and the housing interior. This seal prevents water ingress while allowing the connector to be integrated into the housing structure, solving both the connection and waterproofing requirements.
2Ease of operation
If the harness is drawn out through the housing, then electrical connection is achieved, but the harness may be damaged by external forces
Solution Approach 1:
The patent provides a waterproof seal at the harness draw-out portion that prevents water ingress before it can damage the harness. This protective measure is built into the structure beforehand, ensuring the harness is protected from both mechanical damage and environmental factors.
Solution Approach 2:
The patent uses a flexible waterproof seal that wraps around the harness at the draw-out portion. This flexible barrier protects the harness from external forces and water while allowing the harness to maintain its electrical connection function.
3Reliability
If a waterproof connector is used, then water ingress is prevented, but the device cost increases
Solution Approach 1:
The patent combines the waterproof function with the existing housing and connector fitting portion structure, eliminating the need for separate expensive waterproof connectors. The waterproof seal is integrated into the assembly process, reducing overall device cost while maintaining waterproof performance.
Solution Approach 2:
The patent uses a simple, cost-effective waterproof seal instead of expensive waterproof connectors. This seal provides adequate waterproof protection for the harness draw-out portion at a lower cost, making the solution economically viable.
Data Source
AI summary
A sensor device is configured to be penetrated by a shaft as a target to be detected. The sensor device includes a housing that includes a harness draw-out portion, and a sensor positioned in the housing. The sensor includes a sensor body and a harness to be drawn out of the sensor body via the harness draw-out portion. The housing includes a housing body that has an opening portion, and a cover that closes the opening portion. The harness draw-out portion includes a first draw-out portion provided in a peripheral wall of the housing body, and a second draw-out portion provided in a peripheral wall of the cover. The first draw-out portion and the second draw-out portion are configured to sandwich the entire circumference of a corresponding portion of the harness in a compressing manner.