Planetary Assembly. Description and Operation

Planetary Gear Train, Exploded View

Planetary Gear, Sectional View

Planetary Gear Set

This transmission has 3 planetary gear sets to provide reverse operation and 6 forward speeds.

The gear sets consist of the following components:

• Front Planetary Sun Gear (part of Front Sun Gear and Shell Assembly)
• Front Planetary Carrier
• Front Planetary Ring Gear
• Center Planetary Sun Gear
• Center Planetary Carrier
• Center Planetary Sun Gear
• Rear Planetary Ring Gear
• Rear Planetary Gear Carrier
• Rear Planetary Sun Gear and Shell Assembly

The front planetary sun gear is splined to the forward clutch (1, 2, 3, 4) and is held stationary in 1st, 2nd, 3rd and 4th gears.

The front planetary carrier is splined to the rear planetary ring gear and transmits power from the rear planetary gear set to the front planetary gear set in 2nd, 3rd, 5th and 6th gears and reverse. The front planetary carrier is splined to the drive sprocket of the drive chain. The front planetary carrier is the output component of the planetary gear set.

The front planetary ring gear is splined to the center planetary carrier and transmits power from the center planetary gear set to the front planetary gear set in 1st, 2nd, 3rd and 4th gears.

The center planetary sun gear is splined to the input shaft and is used as the input to the planetary gear sets in 1st, 2nd, 3rd and 4th gears.

The center planetary ring gear is splined to the rear planetary carrier and transmits power from the center planetary gear set to the rear planetary gear set in 3rd gear, and from the rear planetary gear set to the center planetary gear set in 4th gear. It is held stationary by the low one-way clutch (OWC) and the low/reverse clutch in 1st gear and reverse.

The rear planetary carrier is splined to the overdrive clutch (4, 5, 6) hub and transmits power from the input shaft to the rear planetary carrier in 4th, 5th and 6th gears.

The rear planetary sun gear and shell assembly is splined to both the intermediate (2, 6) clutch and the direct (3, 5, R) clutch. The rear planetary sun gear and shell assembly is held stationary by the intermediate (2, 6) clutch in 2nd and 6th gears and is driven by the direct (3, 5, R) clutch in 3rd and 5th gears and reverse.

Front Planetary Carrier Hub, Disassembled View

Front Planetary Carrier Hub, Sectional View

Front Planetary Carrier Hub (Output Hub)

The front planetary carrier hub / parking gear is splined to the front planetary carrier and the drive sprocket of the drive chain. This allows torque to be transmitted from the planetary gear set to the final drive gear.