Floating Seal Ring Holder for In-Vehicle Electric Device Sealing
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Solution Overview
Problem
Conventional seal covers for in-vehicle electric devices require high connection accuracy and are costly due to the need for positioning pins to ensure uniform seal ring compression and effective sealing, which becomes impractical with multiple openings.
Innovation Solution
A seal cover design featuring a floating seal ring holder with a shaft and retaining mechanism that allows for centering and uniform sealing without the need for high-accuracy positioning pins, using a cylindrical nut and screw system with clearance to support the holder and prevent rotation, ensuring proper alignment and sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high connection accuracy is required between the fitting portion and the opening to ensure uniform seal ring compression, then sealing quality is improved, but manufacturing cost increases due to the need for knock pins and high working accuracy
Solution Approach 1:
The seal ring holder is designed to be movable relative to the cover main body through clearance fit between the shaft and insertion hole, allowing the holder to dynamically adjust its position during assembly. This dynamic capability enables the holder to automatically center on the opening without requiring high-precision positioning features like knock pins, thereby reducing manufacturing costs while maintaining uniform seal ring compression.
2Reliability
If knock pins are provided to ensure sufficient connection accuracy for the seal ring, then sealing ability is improved, but device complexity and cost increase
Solution Approach 1:
The seal ring holder utilizes the clearance between the shaft and insertion hole to self-center on the opening during assembly. The movable holder automatically adjusts its position to achieve uniform seal ring compression without requiring external positioning features like knock pins. This self-service mechanism simplifies the overall structure while ensuring reliable sealing.
3Manufacturing precision
If high working accuracy is necessary to provide the knock pin for positioning, then connection accuracy is improved, but productivity decreases and cost increases
Solution Approach 1:
The seal ring holder is designed with movable capability through clearance fit, allowing it to dynamically self-center on the opening during assembly. This eliminates the need for high-precision knock pin fabrication and installation, reducing manufacturing complexity and improving production efficiency while maintaining adequate connection accuracy for sealing purposes.
Data Source
AI summary
A seal cover (S) for closing work openings provided in a case includes a cover main body (10) to cover openings of the case. Seal ring holders (20A, 20B) are arranged on the underside of the cover main body (10) and fit into the openings. Seal rings (25) are on the outer peripheral surfaces of the seal ring holders (20A, 20B) and closely contact inner peripheral surfaces of the openings. Insertion holes (13) penetrate between top and underside surfaces of the cover main body (10). Shafts (26) project from surfaces of the seal ring holders (20A, 20B) facing the underside surface of the cover main body (10) and are inserted into the insertion holes (13) with a clearance. Retainers (16) for retaining the shafts (26) are provided at the projecting ends of the shafts (26) and are engaged with the edges of the insertion holes (13).