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Details

Inventors: Schwarz, Reinhard; Stuhrmann, Heinz; Huckler, Volker; Nobis, Dieter;
Assignee: Deere & Company (Moline, IL)
Primary Examiner: Hill; Mitchell J.
Assistant Examiner:
Attorney, Agent or Firm:

A drive arrangement for a four wheel drive vehicle is equipped with a planetary gear set for driving the front wheels which can operate in either direct drive or with a speed increase and which is shifted according to the steering angle .beta. sensed at the front pair of wheels. To avoid an excessively high jump in speed during the transition from direct drive to the increased speed mode, the planetary gearset is gradually shifted, i.e., the planetary gear clutch and/or brake are allowed to slip in proportion to the steering angle .beta..

DETAILED DESCRIPTION This problem has been solved according to the present invention by providing a gradual, in particular, a stepless, application of a brake or clutch to the part of the planetary that is to be restrained against rotation, with the frictional force controlled over a selected range of steering angles as a function of the steering angle.
By this means, the rotational speed of the front wheels is equalized with that of the rear wheels in such a way that a controlled degree of overrun, even about 0%.
will result.
This contributes to optimal stability and also prevents damage to the tires, as well as to the ground traversed by the vehicle.

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