Patent ID: 7472620

Claim:
A resin double helical gear which is mounted on one of a driving shaft and a driven shaft so as to rotatable therewith and which is capable of meshing with another double helical gear mounted on the other shaft, said resin double helical gear comprising: a first gear portion in the shape of a helical gear arranged on one side in face width directions from a substantially central portion in the face width directions, said first gear portion having teeth which are helical in a direction; and a second gear portion in the shape of a helical gear arranged on the other side in the face width directions from the substantially central portion in the face width directions, said second gear portion having teeth which are helical in a direction opposite to that of said first gear portion, wherein said first gear portion and said second gear portion are molded to be integrated with each other so that each of said teeth of said first gear portion and a corresponding one of said teeth of said second gear portion continuously extend in face width directions, and wherein each of said teeth of said first and second gear portions has a different helix angle from that of a corresponding one of teeth of a companion double helical gear meshing therewith.