초록 ▼

A traction-type transmission which uses a differential reduction principle whereby the present transmission can generate an extremely high output shaft torque, while maintaining a relatively low tangential force through the traction contact. The traction elements of the present invention operate at

A traction-type transmission which uses a differential reduction principle whereby the present transmission can generate an extremely high output shaft torque, while maintaining a relatively low tangential force through the traction contact. The traction elements of the present invention operate at a relatively high surface speed whereby a finite tangential force, transmitted through the traction contacts, represents more power through the transmission. The geometry of the mating traction elements produces a traction contact shape which is very long, in the rolling direction, and narrow in width. This traction contact geometry greatly increases the coefficient of traction, since traction is directly related to the buildup of lubricant strain in the rolling direction. In addition, this narrow traction contact shape virtually eliminates fluid shear. Thus, this traction contact shape not only increases the power capacity of the present invention, but also greatly increases its efficiency. The present invention has a very short power path consisting of only two traction contacts, however it can attain a very high input/output ratio in a single stage.

대표청구항 ▼

A differential traction drive transmission comprising: an input shaft rotating about a first axis of rotation; a carrier directly fixed to said input shaft and arranged to rotate with said input shaft about the first axis of rotation, having at least one planet pin; axis of said planet pin, is subst

A differential traction drive transmission comprising: an input shaft rotating about a first axis of rotation; a carrier directly fixed to said input shaft and arranged to rotate with said input shaft about the first axis of rotation, having at least one planet pin; axis of said planet pin, is substantially parallel to the first axis of rotation; each said planet pin rotatably supporting a compound-planet; said compound-planet having only a first surface and a second surface for conveying rotational energy; said surfaces for conveying rotational energy are located on opposed sides of said compound-planet; a reaction disc having a surface for conveying rotational energy; said compound-planet\s first surface for conveying rotational energy, engaging said reaction disc\s surface for conveying rotational energy; an output disc having a surface for conveying rotational energy; said compound-planet\s second surface for conveying rotational energy, engaging said output disc\s surface for conveying rotational energy; the engagement areas of the first and second surface for conveying rotational energy located on the same side of the rotational axis of said compound-planet; a means for maintaining a force, normal to the engagement areas; said output disc rotatable with an output shaft.