Power transmission device for vehicle

Abstract

Provided is a power transmission device for vehicle, having a continuously variable transmission for continuously varying the change gear ratio, a first gear train for transmitting torque in cases of forward travel, and a second gear train for transmitting torque in cases of reverse travel, these components being disposed in a mutually parallel arrangement between an input shaft to which torque output by a drive power supply is output, and an output shaft for outputting torque, wherein the device is provided with: a first clutch mechanism for switching the torque transmission path leading from the input shaft to the output shaft via the first gear train, to a torque transmission-enabled state or to a torque transmission-disabled state; a dog clutch for switching the path of torque transmission between the input shaft and the output shaft to a continuously variable path involving torque transmission through the continuously variable transmission, or to a reverse path involving torque transmission through the second gear train; a second clutch mechanism for switching both the continuously variable path and the reverse path to a torque transmission-enabled state or to a torque transmission-disabled state with respect to the input shaft or the output shaft; and a counter gear pair disposed at the location at which the torque of the input shaft is transmitted to the continuously variable path and to the reverse path, for participating in transmission of torque between the input shaft and the continuously variable path, and between the input shaft and the reverse path, respectively.

Description

technical field [0001] The present invention relates to a device for transmitting power output from a driving force source of a vehicle, and more particularly to a transmission device having a transmission path including a continuously variable transmission and another transmission path provided in parallel with the transmission path. Background technique [0002] An internal combustion engine generally used as a driving force source of a vehicle has a characteristic that output torque increases as the rotational speed increases. In this regard, the driving force required by the vehicle is generally large at low vehicle speeds and relatively small at high vehicle speeds. That is, in the vehicle, torque opposite to the torque based on the output characteristics of the internal combustion engine is required. In addition, the efficient operating point of the internal combustion engine is limited. Therefore, a transmission capable of appropriately changing a gear ratio is moun...

AI Technical Summary

Problems solved by technology

Therefore, the transmission ratio of the gear train that transmits torque at the start is smaller than the maximum transmission ratio that can be set by the continuously variable transmission, so the transmission ratio range of the entire device cannot be expanded.