Why Can't the Car Door Stay Closed After Opening?

[Harvey]

The reasons why a car door won't stay closed after opening include: 1. Displacement of the door hinge or lock clip; 2. The door lock latch cannot reverse and secure properly; 3. Issues with the contact switch for door closing; 4. Insufficient height of contact installation. Car doors provide access for drivers and passengers while isolating external interference, offering some protection against side impacts and safeguarding occupants. The design requirements for car doors are: 1. Ensuring ease of entry and exit for passengers, with maximum opening angle controlled between 65 to 70 degrees; 2. No positional interference with other parts during the opening process; 3. Reliable locking when closed to prevent accidental opening while driving; 5. Good sealing performance; 6. Large transparent areas to meet lateral visibility requirements; 7. Sufficient strength and rigidity to ensure reliable operation, reduce door vibrations, enhance side collision safety, and prevent door sagging.