In an automatic transmission's simple planetary gearset, the planet pinion carrier is held stationary while the central sun gear is driven as the input member. Under these operating conditions, what mechanical output is produced at the outer ring gear?
- AIt rotates in the same direction as the sun gear at an increased rotational speed.
- BIt locks solid against the planetary carrier to produce a direct 1:1 drive ratio.
- It rotates in the opposite direction of the sun gear at a reduced rotational speed.Cevap
- DIt oscillates without transferring rotary torque to the transmission output shaft.
Cevap
The ring gear rotates in the opposite direction of the sun gear at a reduced rotational speed, providing reverse gear reduction.
When the planet carrier is held stationary by a band or clutch and the sun gear is driven, the planet pinions rotate on fixed shafts like standard idler gears. This external mesh reverses the direction of rotation when transferring drive to the internally toothed ring gear. Because the ring gear has significantly more teeth than the sun gear, the ring gear turns at a lower rotational speed with multiplied torque, creating reverse reduction.
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Planetary gearset kinematics and reverse gear operation in automatic transmissions
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