Drive unit
A drive unit is disclosed. The drive unit includes a prime mover, a torque converter, and a power transmission mechanism. A torque is inputted from the prime mover to the torque converter. The power transmission mechanism is disposed between the prime mover and the torque converter. The power transmission mechanism is configured to transmit the torque outputted from the torque converter toward a drive wheel.
1. A drive unit comprising:
a prime mover;
a torque converter to which a torque is inputted from the prime mover;
an output shaft configured to output the torque outputted from the torque converter; and
a power transmission mechanism disposed between the prime mover and the torque converter, the power transmission mechanism including a plurality of gears and a casing enclosing the plurality of gears, the power transmission mechanism configured to transmit the torque outputted from the torque converter toward a drive wheel,
the output shaft being directly rotatably supported by the casing through a bearing member which directly contacts the output shaft.
2. The drive unit according to claim 1 , wherein the power transmission mechanism is a reducer.
3. The drive unit according to claim 1 , further comprising:
an input shaft that extends from the prime mover, the input shaft configured to input the torque from the prime mover therethrough to the torque converter.
4. The drive unit according to claim 3 , wherein the output shaft extends from the torque converter toward the prime mover.
5. The drive unit according to claim 3 , wherein
the output shaft has a cylindrical shape, and
the input shaft extends in an interior of the output shaft.
6. The drive unit according to claim 3 , wherein the torque converter includes
a cover to which the input shaft is fixed,
an impeller unitarily rotated with the cover, and
a turbine opposed to the impeller.
7. The drive unit according to claim 6 , wherein the impeller is disposed closer to the prime mover than the cover.
8. The drive unit according to claim 3 , wherein
the plurality of gears include
a sun gear, a planet gear, a planet carrier and a ring gear to constitute a planetary gear mechanism, and
a clutch configured to brake rotation of the ring gear,
the sun gear is unitarily rotated with the input shaft, and
the planet carrier is unitarily rotated with the output shaft.
9. A drive unit comprising:
a prime mover;
a torque converter to which a torque is inputted from the prime mover;
an output shaft configured to output the torque outputted from the torque converter;
an input shaft that extends from the prime mover, the input shaft configured to input the torque from the prime mover therethrough to the torque converter; and
a power transmission mechanism disposed between the prime mover and the torque converter, the power transmission mechanism configured to transmit the torque outputted from the torque converter toward a drive wheel, wherein
the power transmission mechanism includes
a planetary gear mechanism including a sun gear, a planet gear, a planet carrier and a ring gear, and
a clutch configured to brake rotation of the ring gear,
the sun gear is unitarily rotated with the input shaft,
the planet carrier is unitarily rotated with the output shaft,
the clutch is a one-way clutch, the clutch configured to make the ring gear rotatable in forward rotation of the input shaft and the output shaft, the clutch further configured to make the ring gear non-rotatable in reverse rotation of the input shaft and the output shaft.