Patent · US Expired

Drive arrangement for a four wheel drive vehicle

US4967868A · kind A · utility

5Cited by

6References

11Claims

0Family size

Assignee

Deere & Company · US

Inventors

Reinhard Schwarz · Garching bei München, DE
Heinz Stuhrmann · Schwetzingen, DE
Volker Huckler · Radolfzell, DE
Dieter Nobis · Neuss, DE

Key dates

Filing date	Apr 21, 1989
Grant date	Nov 6, 1990
Priority date	—
Expiry date	Apr 21, 2009

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB60K17/348
WIPO fieldTransport
WIPO sectorMechanical engineering

Abstract

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..

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.