Motor pinion with adjustable mounting aperture

The utility model discloses a mounting aperture adjustable type motor pinion which comprises a gear ring, fixed teeth are fixedly mounted on the outer surface of the gear ring, lubricating oil channels are formed in the fixed teeth, an inner sleeve ring is connected to the middle of the interior of the gear ring in a penetrating mode, and clamping strips are fixedly mounted on the outer surface of the inner sleeve ring. A clamping groove is formed in the inner wall of the gear ring, a check block is fixedly installed on the outer surface of the front end of the inner ferrule, an installation groove is formed in the rear end of the inner ferrule, a limiting block is movably installed in the installation groove, and an elastic clamping piece is jointly installed at the position, located in the installation groove, between the limiting block and the installation groove. The multiple sets of fixing teeth are annularly distributed on the outer surface of the gear ring at equal intervals. According to the utility m