Vehicle Door Latch Layout With Recessed Capacitor Packaging
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Solution Overview
Problem
The existing door latch devices for vehicles are not miniaturized enough to avoid obstructing the trajectory of the window glass, even when incorporating an emergency power storage body like a capacitor.
Innovation Solution
A door latch device design with a partitioned case that separates the motor and mechanical mechanism from the power storage body, allowing the power storage body to be recessed and minimizing the device's size, thereby accommodating it within the door without obstructing the window glass trajectory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a power storage body is placed inside the door latch device as an emergency power supply means, then the door latch device can provide emergency power supply functionality, but the door latch device becomes large and may obstruct the trajectory of the window glass
Solution Approach 1:
The power storage body is nested within a recessed accommodation portion formed in the partition wall between the first and second accommodation spaces. This allows the power storage body to be integrated into the existing structure without increasing the overall volume of the door latch device, resolving the contradiction between providing emergency power supply functionality and maintaining a compact size.
Solution Approach 2:
Instead of placing the power storage body in the plane of the accommodation spaces, the invention utilizes the third dimension by creating a recessed portion in the partition wall. This vertical/dimensional integration allows the power storage body to be accommodated within the existing footprint, preventing obstruction of the window glass trajectory while maintaining emergency power supply capability.
2Device complexity
If the power storage body is placed in the second accommodation space, then the electrical components are consolidated, but the device volume increases and may obstruct the window glass trajectory
Solution Approach 1:
The partition wall is locally modified by forming a recessed accommodation portion at a specific location. This localized structural change allows the power storage body to be integrated without increasing the overall device volume, while still consolidating electrical components in the second accommodation space. The local quality change resolves the contradiction between component consolidation and volume control.
3Volume of moving object
If the door latch device is miniaturized to avoid obstructing the window glass trajectory, then the device size is reduced, but there may be insufficient space to accommodate the power storage body for emergency power supply
Solution Approach 1:
The power storage body is nested within the recessed accommodation portion of the partition wall, allowing it to be accommodated within the miniaturized door latch device structure. This nesting approach ensures that the emergency power supply capability is maintained even when the overall device size is reduced to avoid obstructing the window glass trajectory.
Solution Approach 2:
The invention utilizes the vertical dimension by creating a recessed portion in the partition wall, allowing the power storage body to be accommodated within the compact footprint of the miniaturized door latch device. This dimensional approach ensures sufficient space for the power storage body without increasing the device's horizontal dimensions that would obstruct the window glass trajectory.
Data Source
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AI summary
A door latch device (10) includes a motor (94), a mechanical mechanism (38), a door lock ECU (2), and a case (20). The door lock ECU (2) includes a printed wiring board (120) and a capacitor (202) connected to the printed wiring board (120). The case (20) includes a bottom plate (122b), a first accommodation space (36) for accommodating the motor (94) and the mechanical mechanism (38) on one side of the bottom plate (122b), and a second accommodation space (124) for accommodating the printed wiring board (120) and the capacitor (202) on the other side of the bottom plate (122b). The bottom plate (122b) is provided with a capacitor accommodation portion (125) recessed from the second accommodation space (124) toward the first accommodation space (36) and the capacitor (202) is arranged in the capacitor accommodation portion (125).