DRIVE TRANSMISSION DEVICE AND IMAGE FORMING APPARATUS

摘要

Drive transmission device (10) includes rotatable member (20), driven member (30), driving coupling (21), and driven coupling (31). Both driving protrusions (22) and driven protrusions (32) are arranged at equal intervals in rotation direction (R). Each driving protrusion (22) is in mating contact with corresponding one of driven protrusions (32). Surface (41) of the driving protrusion (22) that is in contact with the driven protrusion (32) includes inner contact region (42) and outer contact region (43). Inner contact region (42) is located at an inner side relative to planned line (LG) of centroid shift extending in rotation direction (R) through centroid (G) of the driving protrusion (22). Outer contact region (43) is located at an outer side relative to planned line (LG) of centroid shift. Along rotation direction (R), each of the inner contact region (42) and the outer contact region (43) extends toward planned line (LG) of centroid shift.

主权项

1. A drive transmission device comprising:
a rotatable member rotatable in a rotation direction about a rotation axis; a driven member configured to be driven to rotate by rotation of the rotatable member; a driving coupling disposed at an end of the rotatable member; and a driven coupling disposed at an end of the driven member, wherein the driving coupling has a plurality of driving protrusions protruding toward the driven coupling, the driven coupling has a plurality of driven protrusions corresponding to the plurality of driving protrusions and protruding toward the driving coupling, both the plurality of driving protrusions and the plurality of driven protrusions are arranged at equal intervals in the rotation direction, each of the driving protrusions is in mating contact with the corresponding one of the driven protrusions, a surface of each of the driving protrusions that is in contact with the corresponding one of the driven protrusions includes an inner contact region located at an inner side relative to a planned line along which a centroid of the driving protrusion shifts and an outer contact region located at an outer side relative to the planned line of the centroid shift, the planned line of the centroid shift extending in the rotation direction through the centroid of the driving protrusion, and along the rotation direction, each of the inner contact region and the outer contact region extends toward the planned line of the centroid shift.