Patent ID: 9714500
Date: 2017-07-25
CPC Classifications: B60K,B60Y,E02F,F16H,Y02T

Claim:
1. A wheel loader comprising: an engine; a drive shaft; and a transmission comprising an input shaft through which a power from the engine is inputted and an output shaft through which the power from the engine is outputted to the drive shaft, the transmission being configured to perform a gear-shifting operation between the input shaft and the output shaft, wherein the transmission comprises: the mechanical drive unit comprises: a pair of first and second gears attached to the input shaft; a first clutch provided between the first and second gears; an intermediate shaft provided below the input shaft; a pair of third and fourth gears attached to the intermediate shaft and meshing with the first and second gears; a second clutch provided between the third and fourth gears, a fifth gear attached to the intermediate shaft; a combining shaft provided below the intermediate shaft; a sixth gear attached to the combining shaft and meshing with the fifth gear; a first combining gear attached to the combining shaft; a second combining gear provided adjacent to the first combining gear; a third clutch provided between the first combining gear and the second combining gear; and a seventh gear attached to the output shaft and meshing with the first combining gear, the mechanical drive unit being provided between the input shaft and the output shaft, a part of the power combining unit associated with the first hydraulic motor comprises: a sun gear attached to a first motor output shaft of the first hydraulic motor; a plurality of planetary gears arranged around the sun gear and meshing with the sun gear; a gear-shaped carrier on which the planetary gears are supported; a ring gear disposed to surround outer circumferences of the planetary gears and mesh with the planetary gears, the ring gear rotating coaxially with the first motor output shaft; a fourth clutch disposed between the ring gear and a transmission casing; and the first combining gear meshing with the carrier, a part of the power combining unit associated with the second hydraulic motor comprises: an eighth gear attached to a second output shaft of the second hydraulic motor; the second combining gear meshing with the eighth gear; the first combining gear; and the third clutch, the power combining unit is configured to combine the power of the mechanical drive unit and the powers of the first and second hydraulic motors at a position above the output shaft, and the gear trains through which the combined power is transmitted are disposed with use of a space between the travel hydraulic pump and the output shaft that are vertically positioned.