All wheel drive for a motor vehicle
AssigneeDr. Ing. h.c.F. Porsche Aktiengesellschaft
InventorRobert Muller
Life of this patent
Estimating the term…
Abstract
A first axle, such as the front axle of a motor vehicle, is directly driven by the vehicle engine or its gear shift transmission. The vehicle wheels of the rear axle can be connected automatically via two limited slip differential systems that are assigned to them and are arranged on the rear axle. The limited slip differential systems comprises a planetary transmission with a through drive ratio that deviates slightly from 1:1 and a centrifugal brake that engages at the planetary transmission with a significantly higher ratio.
Claims9
In an all-wheel drive for a motor vehicle, having a first axle that can be driven continuously by the vehicle engine or its gear shift transmission, an automatically operating limited slip differential system for bringing two vehicle wheels of a second axle into driving connection with said first axle, said limited slip differential system having a planetary transmission formed of sun gear wheels, planetary wheels and a planetary carrier, and having a through drive ratio which only slightly deviates from 1:1, and a braking device that is applied to the planetary transmission at a high ratio,
- wherein two limited slip differential systems are arranged at the second axle, one limited slip differential system being assigned to the right vehicle wheel, and one limited slip differential system being assigned to the left vehicle wheel, and
- wherein the planetary transmission of each limited slip differential system includes:
- an inlet sun gear wheel;
- an outlet sun gear wheel having a slightly smaller number of teeth than said inlet sun gear wheel;
- said outlet sun gear wheel being disposed coaxial and adjacent to said inlet sun gear wheel and connected with the vehicle wheel to be driven;
- planetary wheels of a planetary carrier each engaging with the two sun gear wheels.
- a braking device functioning between each planetary transmission and a fixed housing.
Dependencies are inferred from the claim text.