GF28.10-P-0002C Transfer Case (VG) Function

GF28.10-P-0002C Transfer case (VG) function
- 163.### ## as of 073497

Component Identification:

The transmission housing (20) and transmission cover (21) are made of a metal alloy and are screwed together.

The input shaft (1) functions directly as a sun gear for the single planetary gear set (15) and is connected to the output shaft of the manual or automatic transmission. The ring gear (16) of the single planetary gearset is fixed to the transmission housing.

Input shaft (1), intermediate shaft (2) and output shaft/rear-wheel drive (3) are slotted into one another, are carried in ball bearings and lie in a single plane in the housing.

The newly designed outer planetary gearset transfers a step-up (high range) or a step-down ratio (low range).

The outer planetary gearset (8) consists of three double planetary gears integrated in the planet carrier which engage in the new output shaft equipped with two sun gears. The larger front sun gear is connected by gearing to the output shaft/rear-wheel drive (3). The smaller rear sun gear runs freely on the output shaft (3). It drives the sprockets (9) using the planet carrier via gearing. The output shaft/front-wheel drive (4) is driven by sprockets (9) via a link chain.

A new range selection motor (6) which is screwed to the outside of the transmission cover, shifts a road ratio or off-road ratio. The oil pump (7) is driven by the intermediate shaft.

Component Identification:

A - Power transmission road ratio 1:1
B - Power transmission off-road reduction gear ratio 2.64:1

Function
When driving straight ahead, the engine torque is distributed between the front and rear axles in the ratio 48:52.

The outer planetary gearset (8) functions as a differential ( Central differential) between the front and rear axles. The engine torque is transferred via the intermediate shaft (2) to the single planetary gearset (15). Either a long step-up ratio (1:1) or a step-down ratio (2.64:1) is shifted to the intermediate shaft according to the position of the reduction hub. A spring (14) on the shift shaft holds the shift fork (13) in the position for the road ratio 1 :1. If the off-road reduction gear is activated, the range selection motor (6) moves the shift fork against the force of the spring which in turn, moves the reduction hub axially on the intermediate shaft.

Power flow road ratio 1:1
The reduction hub (11) is in the left position. The torque from the input shaft (1) is therefore transferred directly to the intermediate shaft (2).

Power flow off-road reduction gear ratio 2.64:1
The reduction hub (11) is in the right position. The torque from the input shaft (1) is therefore transferred via the intermediate shaft (2) to the planet carrier (15).

The fixed ring gear (16) creates a step-down ratio to slow speeds.

Power flow via the intermediate shaft
The outer planet carrier (8) is connected by gearing to the intermediate shaft (2) and transfers the torque from the intermediate shaft to the three double, external planet gears of the outer planetary gearset (8).

The three double, external planet gears consist of three long and three short planet gearwheels.

The three long planet gears transfer the torque from the planet carrier (8) to the sun gear at the front which is connected to the output shaft/rear-wheel drive (3).

The three shorter planet gears transfer the torque from the planet carrier (8) to the sun gear at the back which runs freely on the output shaft/rear-wheel drive. The sprockets (9) connected to the sun gear transfer the torque to the output shaft/front-wheel drive (4) via the link chain.

Outer planetary gearset
The larger sun gear is connected to the output shaft/rear-wheel drive (3).

The smaller sun gear runs freely on the output shaft/rear-wheel drive (3). It transfers the torque via the sprockets (9) to the output shaft/ front-wheel drive (4). The torque is transferred via the planet carrier (8) (which is connected to the intermediate shaft) and the smaller planet gears.

The double planet carrier (8) and the different sized sun gears can balance different speeds from the front and rear axle.