Obturator for a motor vehicle body, and motor vehicle equipped with such an obturator

The closure has a closing shutter (4) mounted pivotally around a fixed axle (5), and a spring (6) pivotally mounted around another fixed axle (61) and connected to the shutter by a movable axle (62). The spring acts on a bent arm (7) having an end (8) connected with the shutter. The spring pivots between three distinct positions such as closed position, half-open position and open position of the closing shutter. An independent claim is also included for a motor vehicle comprising a body work having a closure.