| US 7,472,620 B2 | ||
| Resin double helical gear and gear train using same | ||
| Toru Hagihara, Sayama (Japan) | ||
| Assigned to Enplas Corporation, Saitama (Japan) | ||
| Filed on Oct. 12, 2004, as Appl. No. 10/964,340. | ||
| Claims priority of application No. 2003-355078 (JP), filed on Oct. 15, 2003. | ||
| Prior Publication US 2005/0081668 A1, Apr. 21, 2005 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. F16H 55/18 (2006.01) | ||
| U.S. Cl. 74—458 [74/461] | 7 Claims |
| 1. 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.
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