Profile: Chongqing Xinchang Gear Industry Co., Ltd. is engaged in the production of motorcycle gear, helical gear, bevel gear, spur gear, miter gears, internal gears, screw gears and gear racks. The teeth on helical gears are cut at an angle to the face of the gear. When two teeth on a helical gear system engage, the contact starts at one end of the tooth and gradually spreads as the gears rotate, until the two teeth are in full engagement. This gradual engagement makes helical gears operate much more smoothly and quietly than spur gears. For this reason, helical gears are used in almost all car transmissions. Due to the angle of the teeth on helical gears, they create a thrust load on the gear when they mesh. Devices that use helical gears have bearings that can support this thrust load.