Hybrid wheel loader
A hybrid wheel loader includes: an engine that includes an output shaft; a motor/generator that includes a rotating shaft directly attached to the output shaft of the engine; a transmission that includes an input shaft attached to the rotating shaft of the motor/generator, and an output shaft; a propeller shaft disposed on an output side of the transmission and driven via the output shaft of the transmission; an electricity storage device; and a control device that stores electricity into the electricity storage device by collecting electrical energy at the motor/generator.
1. A hybrid wheel loader comprising:
an engine that includes an output shaft;
a motor/generator that includes a rotating shaft directly attached to the output shaft of the engine;
a transmission that includes an input shaft attached to the rotating shaft of the motor/generator, and an output shaft;
a propeller shaft disposed on an output side of the transmission and driven via the output shaft of the transmission;
an electricity storage device;
a control device that stores electricity into the electricity storage device by collecting electrical energy at the motor/generator; and
a traveling dynamo-electric motor disposed on an output axis of the propeller shaft.
2. The hybrid wheel loader according to claim 1 , wherein:
the traveling dynamo-electric motor is disposed inside a front frame.
3. The hybrid wheel loader according to claim 1 , wherein:
when a tractive force provided by the engine is not sufficient, the control device drives the traveling dynamo-electric motor with electric power from the electricity storage device.
4. The hybrid wheel loader according to claim 3 , wherein:
the control device drives the traveling dynamo-electric motor with electric power from the electricity storage device at a traveling operation start.
5. The hybrid wheel loader according to claim 3 , further comprising:
a bucket that swings upward/downward; and
a height detector that detects a height of the bucket, wherein:
upon deciding that the height of the bucket detected by the height detector is smaller than a predetermined height, the control device drives the traveling dynamo-electric motor with electric power from the electricity storage device.
6. The hybrid wheel loader according to claim 5 , further comprising:
a cylinder that causes the bucket to swing upward/downward; and
a pressure detector that detects a pressure at the cylinder, wherein:
upon deciding that the pressure at the cylinder detected by the pressure detector is greater than a first pressure, the control device drives the traveling dynamo-electric motor with electric power from the electricity storage device.
7. The hybrid wheel loader according to claim 6 , wherein:
upon deciding that the pressure at the cylinder detected by the pressure detector is equal to or greater than a second pressure that is higher than the first pressure, the control device drives the motor/generator with electric power from the electricity storage device.
8. The hybrid wheel loader according to claim 6 , wherein:
upon deciding that the treasure at the cylinder detected by the pressure detector is less than the first pressure while the driving dynamo-electric motor with electric power from the electricity storage device, the control device stops driving the traveling dynamo-electric motor.
9. The hybrid wheel loader comprising:
an engine that includes an output shaft;
a motor/generator that includes a rotating shaft directly attached to the output shaft of the engine;
a transmission that includes an input shaft attached to the rotating shaft of the motor/generator, and an output shaft;
a propeller shaft disposed on an output side of the transmission and driven via the output shaft of the transmission;
an electricity storage device;
a control device that stores electricity into the electricity storage device by collecting electrical energy at the motor/generator; and
wherein, if a change quantity, indicating an extent to which the electricity storage device is charged, is less than a predetermined quantity during deceleration, the control device stores electrical energy at the motor/generator and the traveling dynamo-electric motor into the electricity storage device.
10. A hybrid wheel loader comprising:
an engine that includes an output shaft;
a motor/generator that includes a rotating shaft directly attached to the output shaft of the engine;
a transmission that includes an input shaft attached to the rotating shaft of the motor/generator, and an output shaft;
a propeller shaft disposed on an output side of the transmission and driven via the output shaft of the transmission;
an electricity storage device;
a control device that stores electricity into the electricity storage device by collecting electrical energy at the motor/generator; and
wherein the hybrid wheel loader is structured so as to allow the motor/generator, attached to the output shaft of the engine, to be disengaged for replacement with a flywheel and a torque converter.