Vehicle Door Latch Structure for Sag-Free Closing Alignment
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Solution Overview
Problem
Existing door latch systems in vehicles without a B pillar fail to prevent door sagging during closing operations, leading to potential damage and interference issues.
Innovation Solution
A door latch device equipped with a door sagging prevention bracket that supports the door's bottom portion, incorporating a latch unit, pop-up guide unit, and locking unit to stabilize the door during swing and sliding motions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a door latch device is used in a vehicle without a B pillar, then the door can be opened and closed easily with a simple structure, but the door sags during closing operation causing damage and interference
Solution Approach 1:
A sagging prevention bracket is introduced as an intermediary component between the door and the door latch device. The bracket includes a support portion that contacts the door striker and a connection portion that connects to the latch device body, transferring the door's weight and preventing sagging during closing operations without interfering with the latch mechanism's functionality.
2Ease of operation
If the door performs swing motion closing operation, then the door can be opened and closed smoothly, but the bottom portion of the door contacts the side step cover causing damage
Solution Approach 1:
The sagging prevention bracket applies preliminary support force to the door striker during the closing operation. The support portion of the bracket contacts the door striker and prevents the door bottom from contacting the side step cover by maintaining proper door alignment throughout the swing motion, preventing damage before it can occur.
3Device complexity
If no sagging prevention structure is provided, then the door latch device structure remains simple, but the door contacts the door latch device fastening portion causing reversal
Solution Approach 1:
The sagging prevention bracket serves as a mediator that supports the door weight and maintains proper positioning during closing. The bracket's support portion contacts the door striker while the connection portion attaches to the latch device body, preventing the door from contacting and damaging the fastening portion of the door latch device.
Data Source
AI summary
A door latch apparatus for vehicles, includes: a door striker fixed to a vehicle body in response to one lower side of a door which is opened or closed by double motions of pop-up and swing motions through a hinge unit; a latch unit mounted on the one lower side of the door to lock or release the door striker; a pop-up guide unit guiding the one lower side of the door by the door striker during the pop-up motion of the door; a locking unit locking the door striker when the door striker enters the pop-up guide unit while the door is closed by the swing motion; and a door sagging prevention bracket including one end portion fixed to a body of the latch unit, and extending toward the locking unit while being spaced apart from the top portion of the pop-up guide unit.