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Video Autom. Transmission
Video Power Flow
Video Add. Information
Video 6-gears Automatic
Video 7-gears Automatic
Video 8-gears Automatic
Video Four-wheel Drive)
Video Autom. Transm. (bus)
Video Autom. Transm. (repair)
Video Planetary Gearbox
Video Comb. Planetary Set
Video Multi-disc Clutch

Video Free-wheel
Video Transmission Box
Video Fuzzy Logic
Video Semi Autom. Transm.
Video Cont. Var. Transm.
Video Chain CVT-gearbox
Video Tractor
Video Combine Harvester
Video CVT for Tractor
Video Var. Transmission
Video Seq. Gearbox 1
Video Seq. Gearbox 2
Video Seq. Gearbox 3
Video Seq. Gearbox 4
Video D.-clutch Gearbox 1
Video D.-clutch Gearbox 2
Video Transmission control

Video Transmission ratio
Video Planetary gearbox
Video Hydraulic ratio
Video Two shafts gearbox

Video Automatic transmission 1

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Planetary Gearbox

Dynamic load gearbox (applications in motor-car area)

High torques can be transferred. The planetary gearbox allows a change of the transmission ratio under load, without interrupting the power flow. The gearwheels are provided with internal gear teeth in the ring-gear-wheel making the gearing especially compact. No additional shaft with gearwheel for the reverse gear, as in a manual gearbox, is necessary.

Planet grouping is also found in transfer gears of four-wheel drives, in the drive hubs of trucks/busses and in the starter motor.

Multiple-disc-clutches regulate the power-flow

In the simplest case, the planetary gearbox consists of a sun wheel, planet wheels, a planet wheel carrier and a ring-inside-gear (hollow)wheel. With this planetary gearbox, the sun wheel is connected in the center, with several planet wheels, to a positive fitting internal ring-gear-wheel. Sun wheel, planet wheel carrier or ring-gear-wheel can be in each case, driving, driven or braked. A gear change is possible when this set-up is changed by multiple-disc clutches and/or braking. In today's automatic gearboxes, at least a combined planetary system is generally installed.
Without an additional gear-wheel, a reverse gear is engageable using a parking brake on the planet wheel carrier. In this case, the engine must be connected to the sun wheel and the final drive to the ring-gear-wheel. 09/08               Top of page               Index
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Translator: Don Leslie - Email:

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