Wheel loader

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:
• a mechanical drive unit comprising a plurality of gear trains driven by the power from the engine;
• a travel hydraulic pump for a hydraulic static transmission, which is configured to be driven by the input shaft to feed a hydraulic oil for traveling;
• an accessory hydraulic pump that is provided coaxially with the travel hydraulic pump or provided through a power take-off device positioned above the input shaft and that feeds a hydraulic oil for working equipment;
• a first hydraulic motor and a second hydraulic motor configured to be driven by the hydraulic oil fed from the travel hydraulic pump;
• and
• a power combining unit configured to combine powers of the first and second hydraulic motors with a power of the mechanical drive unit, wherein
• 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.