Continuously variable transmission
First Claim
1. A continuously variable transmission comprising a toroidal-type continuously variable speed change unit, a planetary gear mechanism, a counter gear mechanism, and a Low/High switching mechanism, wherein:
- the planetary gear mechanism comprises a first carrier, first and second pinions which are supported by the carrier, which are axially spaced and which rotate together as an integral unit, a first sun gear that is in mesh with the first pinion, a second sun gear that is in mesh with the second pinion, and one simple planetary gear unit including a first element, a second element, and a third element, wherein the first carrier is connected to the first element of the simple planetary gear unit and the second sun gear is connected to the second element of the simple planetary gear unit;
rotation of an input shaft is input to the first carrier, and output rotation, which is the rotation of the input shaft after the direction and speed thereof have been changed by the toroidal-type continuously variable speed change unit, is input to the first sun gear; and
the Low/High switching mechanism provides a Low mode, wherein rotation of the third element of the simple planetary gear unit is reversed in direction by the counter gear mechanism and output to an output shaft, and a High mode wherein rotation of the second sun gear is output to the output shaft.
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Accused Products
Abstract
Rotation of an input shaft is directly transmitted to a front carrier of a planetary gear mechanism, and rotation, which is speed-changed and reversed by a toroidal-type continuously variable speed change unit, is transmitted to a first sun gear. When a Low clutch is applied, rotation of an output carrier of a simple planetary gear unit is transitted to a counter gear mechanism via a common carrier, and then output at an output shaft. When a High clutch H is applied, rotation of a second sun gear is transmitted to the output shaft. Thus, the pinion shaft is shortened and the service life span of a supporting bearing is increased as compared with a planetary gear mechanism that has a three-step pinion.
6 Citations
12 Claims
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1. A continuously variable transmission comprising a toroidal-type continuously variable speed change unit, a planetary gear mechanism, a counter gear mechanism, and a Low/High switching mechanism, wherein:
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the planetary gear mechanism comprises a first carrier, first and second pinions which are supported by the carrier, which are axially spaced and which rotate together as an integral unit, a first sun gear that is in mesh with the first pinion, a second sun gear that is in mesh with the second pinion, and one simple planetary gear unit including a first element, a second element, and a third element, wherein the first carrier is connected to the first element of the simple planetary gear unit and the second sun gear is connected to the second element of the simple planetary gear unit;
rotation of an input shaft is input to the first carrier, and output rotation, which is the rotation of the input shaft after the direction and speed thereof have been changed by the toroidal-type continuously variable speed change unit, is input to the first sun gear; and
the Low/High switching mechanism provides a Low mode, wherein rotation of the third element of the simple planetary gear unit is reversed in direction by the counter gear mechanism and output to an output shaft, and a High mode wherein rotation of the second sun gear is output to the output shaft. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification