Vehicular Control Device Packing Attachment via Segmented Projections
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Solution Overview
Problem
The existing waterproof packings in vehicular control devices require frequent replacement for maintenance, leading to reduced sealing performance due to sagging under their own weight, especially in larger openings, making maintenance more troublesome.
Innovation Solution
A vehicular control device design featuring first and second projections around an opening, with fitting holes in the packing and a fastening member to secure the cover, allowing for improved maintainability and sealing performance without the need for frequent packing removal and reinstallation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the packing is fastened only at the four corners with bolts and nuts to simplify maintenance, then maintenance becomes easier, but the packing sags under its own weight and sealing performance is reduced
Solution Approach 1:
The packing attachment system is segmented into two independent parts: (1) the packing itself attached to the housing via fitting holes and projections, and (2) the cover attached via fastening members. This allows the packing to be secured at multiple points along its entire length rather than just at corners, preventing sagging while maintaining ease of maintenance.
Solution Approach 2:
The patent extracts the packing attachment function from the cover fastening system. The packing is attached directly to the housing through fitting holes and projections, separate from the cover fastening mechanism. This allows the packing to be independently secured at multiple points along its length, ensuring proper sealing without requiring corner-only fastening.
2Reliability
If bolts and nuts are spaced at regular intervals to prevent packing sagging, then sealing performance is maintained, but all bolts and nuts must be removed for maintenance making the process more troublesome
Solution Approach 1:
The fastening system is segmented into two independent subsystems: the packing attachment subsystem (using fitting holes and projections) and the cover attachment subsystem (using fastening members). This segmentation allows the packing to be secured at multiple intervals for proper sealing, while the cover can be independently removed for maintenance without requiring removal of all fastening elements.
Solution Approach 2:
The patent introduces dynamic flexibility to the maintenance process. The cover can be removed and reattached without affecting the packing, which remains permanently secured through the fitting hole and projection mechanism. This dynamic separation allows maintenance operations to be performed without disturbing the sealing system.
3Area of stationary object
If the opening size is increased to accommodate larger components, then component accessibility is improved, but the packing sags more under its own weight reducing sealing effectiveness
Solution Approach 1:
The packing support system is segmented into multiple fitting holes distributed around the opening perimeter. This segmentation allows the packing to be supported at multiple points along its entire length, preventing sagging even in large openings. The fitting holes can be positioned at optimal intervals based on the specific opening dimensions and packing material properties.
Data Source
AI summary
A first projection and a second projection are disposed around an opening in a housing. A first fitting hole into which the first projection is to be fitted and a second fitting hole into which the second projection is to be fitted are formed around a central hole in a packing. The first projection and the second projection are respectively fitted into the first fitting hole and the second fitting hole, whereby the packing is attached to the housing. A cover to cover the opening and on an area around the opening is attached to the housing by means of a fastening member mated with the second projection with the packing placed between the cover and the housing.