Vehicle Door Latch Switch Plate Integration
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Solution Overview
Problem
Conventional door latch devices face reduced assembly efficiency due to the separate installation of half-closed door detection switches and the need for intermediate members between these switches and latches, which complicates the assembly process.
Innovation Solution
A vehicle door latch device design where the half-closed door detection switch and its electric wiring are integrated onto the switch plate, intersecting orthogonally with the latch's plane of rotation, allowing direct interaction and eliminating the need for intermediate members, with the motor positioned between the detection switch and other components on the switch plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If half closed door detection switches are installed separately from the switch plate, then the switch can be installed, but the assembly efficiency is reduced due to additional installation steps
Solution Approach 1:
The patent integrates the half-closed door detection switch directly onto the switch plate, merging two previously separate components. The switch plate now serves dual functions: as the mounting base for electrical components and as the mounting surface for the detection switch. This eliminates the need for separate installation steps and intermediate members, directly improving assembly efficiency while reducing installation process complexity.
2Ease of manufacture
If intermediate members are interposed between the half closed door detection switch and the latch, then the switch can be installed on the switch plate, but the assembly efficiency is reduced
Solution Approach 1:
The patent removes intermediate members from the detection mechanism by directly mounting the half-closed door detection switch onto the switch plate. The switch pin of the detection switch directly engages with the latch without requiring intermediate transmission members. This extraction of unnecessary components simplifies the overall structure and improves assembly efficiency.
3Productivity
If all electrically operating parts are installed on the switch plate, then the assembly efficiency is improved, but the switch plate becomes more complex
Solution Approach 1:
The switch plate is designed to serve multiple functions: it acts as the mounting base for electrical components, provides the mounting surface for the half-closed door detection switch, and serves as the structural support for the entire operating unit assembly. This multi-functional design consolidates multiple components into a single integrated structure, improving assembly efficiency while the modular design keeps the switch plate structure manageable.
Data Source
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AI summary
A vehicle door latch device includes an interlocking unit assembly having an interlocking mechanism that is able to hold a door in a closed position by engaging with a striker that advances thereto along with closing movement of the door, and an operating unit assembly having an operating mechanism that is able to switch over the door between a locked state and an unlocked state; the interlocking unit assembly has a latch that is able to rotate to a latched position from an open position via a half closed door position by interlocking with the striker; the operating unit assembly has a casing, in which the interlocking unit assembly is fitted and in which the operating mechanism is installed, and a switch plate, on which a half closed door detection switch having a switch pin that abuts against the latch in the open position and half closed door position, or in the latched position and that is pushed in, and an electric wiring connected thereto are installed, and which is integrally installed in the casing; and a plane of rotation of the latch and a plate surface of the switch plate orthogonally intersect each other. Thereby, a vehicle door latch device with improved assembly efficiency is provided.