Profile: Shanghai DE Industry Co., Ltd. manufactures break valves, multiport valves, steering valves, flow-enlarging valves, redirector and other hydraulic valves for vehicles & construction machinery. Helical gear is a industrial gear type and these gears are having angled teeth which creates force on another gear during meshing. Helical gears are fine-tuning in terms of designing so that helical gears work better than spur gears. Helical gears are curved in shape and teeth are not parallel to the axis of rotation but set at an angle. The helical gears have cut teeth in a helix and corkscrew in shape. It is used to design the engine to reduce the noise.