A parallelogram mechanism (yellow and green rockers, blue conrod) makes the pink door panel (fixed to violet bevel gear) always parallel to the car longitudinal vertical plane.
Yellow bevel gear is fixed to yellow rocker.
The violet bevel gear rotates on a bearing fixed to the blue conrod.
Here the two gears have the same tooth number.
The door has two motions at the same time:
- rotation around a stationary vertical axis.
- rotation around a moving horizontal axis.
Thus, the door is vertical at open position to ease entry/exit.
The chamfer at upper front corner of the panel is needed to avoid its collision with the car body during open/close process.