Air compressor

An air compressor comprising:

• a base including a first positioning orifice and a second positioning orifice, the second positioning orifice accommodating a bearing, a drive gear mounted on a motor extending through the first positioning orifice, the first positioning orifice and the second positioning orifice coplanar in the base;
• a cylinder connected to the base and including an air storage seat communicating with the cylinder;
• and
• a transmission mechanism driving a piston to reciprocatingly move in the cylinder;
• wherein the transmission mechanism includes a torque gear, a central orifice defined in the torque gear, and the transmission mechanism further includes a connection rod extending from the torque gear, wherein the central orifice has screw threads defined therein, and the central orifice of the torque gear corresponds to the bearing, and a screw bolt is screwed with the central orifice after being inserted through the bearing and the torque gear;
• wherein the connection rod of the torque gear is rotatably connected with the piston;
• wherein an upper surface of the base is flush with a top of the bearing, a spacing between the upper surface of the base and a toothed portion of the torque gear being a distance which is greater than zero such that the toothed portion is spaced from the upper surface of the base when the torque gear rotates;
• and
• wherein a surrounding element extends from a side of the torque gear around the central orifice to space the toothed portion of the torque gear from the upper surface of the base.