Patent ID: 8771131
Filing Date: 2014-07-08
Classification: F16H

Abstract:
1. A transmission device capable of transmitting power applied to an input shaft to an output shaft while changing a speed ratio to a plurality of stages, the transmission device comprising: a single-pinion type first planetary gear mechanism including a first sun gear that is coupled to the input shaft, a first carrier that rotatably supports a first pinion gear that meshes with the first sun gear, and a first ring gear that meshes with the first pinion gear; a single-pinion type second planetary gear mechanism including a second sun gear, a second carrier that rotatably supports a second pinion gear that meshes with the second sun gear, and a second ring gear that is coupled to the first carrier and meshes with the second pinion gear; a third planetary gear mechanism including a rotation element that is coupled to the second sun gear, and a rotation element that is coupled to the output shaft; a case that accommodates the first, second, and third planetary gear mechanisms; a first clutch capable of coupling and uncoupling the input shaft and the second sun gear; a second clutch capable of coupling and uncoupling the input shaft and the second carrier; a first brake that is engaged when forming a first shift speed, and capable of holding the first ring gear stationary to the case; and a second brake that is engaged when forming a second shift speed that is a lower speed than the first shift speed, and capable of holding the second ring gear stationary to the case, wherein the first planetary gear mechanism is disposed more toward the input shaft side than the second planetary gear mechanism, and the second planetary gear mechanism is disposed more toward the input shaft side than the third planetary gear mechanism, and the first brake is disposed circumferentially outward of the second planetary gear mechanism so as to at least partially overlap with the second planetary gear mechanism as viewed from a radial direction, and the second brake is disposed circumferentially outward of the first planetary gear mechanism so as to at least partially overlap with the first planetary gear mechanism as viewed from the radial direction.