| 摘要 |
To prevent the generation of noise and/or vibration due to the backlash of the gear wheels (12,16) in the cam device driven by a two mutually meshing gear wheels, a backlash reversal suppression means for suppressing an impulsive reversal of the backlash in the meshing between the gear wheels (12) and (16) during transition from first rotational phase region in which the cam (10) positively drives the roller (24) to the second rotational phase region in which the cam (10) is in turn positively driven by the roller (24) comprises a spring piece (60) supported at its root end by the gear wheel (12) to extend in the radial direction of the gear wheel (12) and a spring engaging means (62) provided at the gear wheel (16). Due to a difference between the mounting phases of the spring piece (60) and the spring engaging means (62) and also due to a deviation of the position of contact between the spring piece and the spring engaging means from a middle point between the rotation centers (14) and (18) of the gear wheels (12) and (16) toward the side of the ratation center (18), the spring piece (50) is deformed to bend such that the spring force generated thereby biases the gear wheel (12) in the retarding direction relative to the gear wheel (16), to suppress the backlash. |
