Vehicle Door Latch Waterproof Seal Positioning and Water Shielding
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Solution Overview
Problem
The existing vehicle door latch device has poor workability during the attachment of the waterproof seal, leading to potential deviations in positioning and wrinkles, and there is a risk of rainwater entering the striker advancing groove due to impaired waterproofness.
Innovation Solution
The device incorporates an upper positioning unit on the body and a side positioning unit on the cover to accurately position the waterproof seal, along with a water shielding wall on the top waterproof cover to guide rainwater away from the seal, ensuring proper attachment and enhanced waterproofing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the waterproof seal is stuck continuously from the rear surface top portion towards the lower half portion and then bent at right angles towards the cover, then the seal covers the required areas, but the sticking position may be deviated and wrinkles are generated at the bent portion
Solution Approach 1:
The waterproof seal attachment is divided into multiple independent sticking sections: a first sticking section on the rear surface of the body and a second sticking section on the cover. This segmentation allows each section to be attached separately and accurately positioned, avoiding the problems of continuous sticking and bending that cause position deviation and wrinkles.
Solution Approach 2:
Positioning protrusions are provided in advance on the body and cover at the exact locations where the waterproof seal should be stuck. These protrusions serve as pre-positioned guides that ensure accurate alignment before the actual sticking operation, making it easier to achieve precise positioning without deviation.
2Reliability
If the waterproof top cover is installed to cover the coupling portion, then the coupling portion is protected, but rainwater flowing down along the top cover surface will flow towards above the rear surface side of the body along the upper surface of the waterproof seal
Solution Approach 1:
The function of rainwater protection is extracted from the general waterproof top cover and concentrated into a specific water shielding wall structure. This dedicated water shielding wall is positioned to intercept rainwater before it can reach the waterproof seal and body, providing targeted protection that prevents water ingress without requiring the entire top cover to bear this specific function.
Data Source
AI summary
A vehicle door latch device includes: a seal sticking portion at which an upper seal portion of a waterproof seal is stuck, and which is provided upward in a protruding manner at an upper portion of a body accommodating portion; an upper positioning unit which is provided at a lower edge and a side edge on an extra-vehicle side of the seal sticking portion, the upper positioning unit being configured to receive and position a lower surface and an end face on the extra-vehicle side of the upper seal; and a side positioning unit which is configured to position a side seal portion of the waterproof seal to be directed diagonally downward, and which is provided on a surface on an intra-vehicle side of the cover where the side seal portion is stuck.