Patent ID: 7526977
Filing Date: 2009-05-05
Classification: F16H,Y10S,Y10T

Abstract:
1. A resin-made gearing apparatus for transmitting a rotational motion between two shafts by an engagement of a pair of resin-made gears arranged to have opposite teeth meshed with each other, comprising a configuration wherein only one tooth flank side of each tooth in one of the gears is provided with an overhang section that is disposed on at least one of end portions in a direction of tooth width, and overhangs diagonally from said one tooth flank side toward an adjacent tooth side to eliminate a backlash during a time when said pair of gears are meshed with each other; an end portion in a direction of a tooth width of each tooth of the other gear, corresponding to said overhang section of said each tooth of the one gear, is provided with a lightening section that is disposed at an end face on the side of the end portion and inside a profile of said each tooth of the other gear; and said overhang section of the one gear as well as said lightening section of the other gear are elastically deformed due to meshing of the teeth of said pair of gears during the rotation of said pair of gears, to thereby absorb a given amount of backlash.