Infinitely variable transmission
AssigneeNissan Motor Co., Ltd.
InventorYuichi Shibukawa
Life of this patent
Estimating the term…
Abstract
A continuously variable transmission (2) has a first helical gear (204A) for its rotation output. The fixed speed ratio transmission (3) has a second helical gear (203B) for its rotation output. The third helical gear (207) rotates according to the difference of the rotation speeds of the first helical gear (204A) and second helical gear (203B). These helical gears rotate on a same rotation shaft (204). One of the three helical gears positioned between the other two helical gears applies a bending moment on the rotation shaft (204) due to a radial force given by a gear meshed therewith. The direction of the tooth trace of the other two helical gears is set so that at least one of them produces a bending moment in an opposite direction to the first bending moment.
Claims26
An infinitely variable transmission, comprising:
- an input shaft;
- a continuously variable transmission which outputs a rotation of the input shaft to a first helical gear at an arbitrary speed ratio;
- a fixed speed ratio transmission which outputs a rotation of the input shaft to a second helical gear at a fixed speed ratio;
- and
- a third helical gear which changes a rotation direction and a rotation speed according to a difference between a rotation speed of the first helical gear and a rotation speed of the second helical gear, the first helical gear, the second helical gear and the third helical gear being supported on a common rotation shaft, one of the first helical gear, the second helical gear and the third helical gear being disposed between the other two gears and one of the other two gears having a tooth trace which generates a thrust force exerting a bending moment on the rotation shaft in a direction opposite to a direction of a bending moment exerted by a radial force acting on the gear which is disposed between the other two gears on the rotation shaft.
Dependencies are inferred from the claim text.