초록 ▼

The present invention provides a differential gear capable of constantly ensuring a stable differential motion restricting force even in the case of a low rotational speed. In the present invention, when there occurs a difference in rotational speed between output side rotary elements, rollers are a

The present invention provides a differential gear capable of constantly ensuring a stable differential motion restricting force even in the case of a low rotational speed. In the present invention, when there occurs a difference in rotational speed between output side rotary elements, rollers are allowed to roll while being in contact with the confronting faces of the input side and output side rotary elements. The rollers move along rotational trajectories of the output side rotary elements while being restricted by a holder element from rolling toward the direction inclined by a predetermined angle relative to the rotational trajectories of the output side rotary elements. Thus, there occurs a frictional force between the rollers and the contact faces therewith, which results in a resistance to restrict the differential motion, At that time, the rollers generate a sliding friction in the course of rolling, thereby always ensuring a stable frictional force based on a dynamic friction even at a low rotational speed.

대표청구항 ▼

[ What is claimed is:] [1.] A differential gear having an input side rotary element to be rotated by an external driving force, a pair of output side rotary elements arranged coaxially with the input side rotary element, and transmission means for transmitting a rotational force of the input side ro

[ What is claimed is:] [1.] A differential gear having an input side rotary element to be rotated by an external driving force, a pair of output side rotary elements arranged coaxially with the input side rotary element, and transmission means for transmitting a rotational force of the input side rotary element to the output side rotary element while permitting a difference in rotational speed between the output side rotary elements, said differential gear comprising:a plurality of rollers interposed between axially confronting faces of said input side rotary element and at least one pair of output side rotary elements, said plurality of rollers when there occurs a difference in rotational speed between said pair of output side rotary elements being allowed to roll while being in contact with said confronting faces of said input and output side rotary elements; anda roller holder for holding said plurality of rollers at predetermine intervals in a freely rolling manner along a predetermined circumference around the rotational axes of said input side and output side rotary elements, whereinrolling axes of said rollers are inclined by predetermined angles relative to a radius such that said rollers impart frictional resistance to rolling between said input and output rotary elements, andwherein said rolling axes are inclined by predetermined angles relative to a plane including rotational axes of said input side and output side rotary elements.