Automotive automatic brake device

The utility model discloses an automotive automatic brake device, including the car, the car bottom is provided with the transmission shaft, fixedly connected with master gear on the transmission shaft, main gear meshing transmission has the pinion, the first axis of rotation of the axle center fixedly connected with of department of pinion, first axis of rotation runs through and rotates and is connected with first mount, the utility model relates to a car brake technical field. This automotive automatic brake device, reached in the time of car overspeed driving, the pombe receives centrifugal force in the overspeed governor, compress to the outside, it rotates to drive the speed reduction frame through the jack catch, brake, the emergence of collision prevention accident, and the drivingsafety is ensured, guarantee the mesh of the interior driver and crew's of car personal safety, reached and worked as the longitudinal separation, when having sensed the object and closely having contacted, drive through the