Drive of a cross-country vehicle
AssigneeDr. Ing. h.c.F. Porsche Aktiengesellschaft
InventorRobert Muller
Life of this patent
Estimating the term…
Abstract
A cross-country vehicle comprising an all-wheel drive is driven by a reciprocating engine installed transversely close to the front axle and by means of a change speed transmission which is also disposed transversely in the front. From the change speed transmission, the drive torque flows onto a planetary transmission operating as a center differential. The ring gear of the planetary transmission drives the front axle; the sun gear drives a low-high change-over unit. The planetary transmission, the change-over unit and the wheel sets connected behind it are constructed such that, during the high operation, the major portion of the torque is available at the front axle, and, in the low operation, is available on the rear axle. The center differential can be locked in the high and in the low operation.
Claims14
A drive of a cross-country vehicle, comprising:
- a reciprocating engine installed transversely of the vehicle adjacent a vehicle front axle;
- an also transversely installed change-speed transmission by means of which the front axle and a rear vehicle axle are driven simultaneously by way of a center differential, and
- a change-over unit for change over from a cross-country low operation to a road high operation, said change-over unit being operably arranged in a transmission line between the center differential and the rear axle, said change-over unit being drivingly connected to said center differential via a tranmission member, wherein the change-over unit includes selectably engageable gear sets operable to control simultaneous distribution of torque to both the front and rear axles with a majority portion of torque transmitted to the front axle during the high operation and to the rear axle during the low operation.
A drive of a cross-country vehicle comprising:
- a reciprocating engine installed transversely of the vehicle adjacent a vehicle front axle;
- an also transversely installed change-speed transmission by means of which the front axle and a rear vehicle axle are driven simultaneously by way of a center differential, and
- a change-over unit for change over from a cross-country low operation to a road high operation, said change-over unit being operably arranged in a transmission line between the center differential and the rear axle, wherein the change-over unit is operable to control distribution of torque to the front and rear axles with a majority portion of torque transmitted to the front axle during the high operation and to the rear axle during the low operation,
- wherein the center differential is operably connected in between the change speed transmission and the change-over unit, wherein said center differential is operable to transmit only a fraction of the transmission output torque to the change-over unit,
- wherein a torque transmission to the rear axle takes place in gear sets of the changeover unit,
- wherein a planetary transmission is used as the center differential, a planet carrier of the planetary transmission being driven by the change-speed transmission, a ring gear of the planetary transmission driving the front axle and a sun gear of the planetary transmission driving the change-over unit, and
- wherein the change-over unit comprises two gear pairs consisting of one loose gear and one fixed gear respectively, and of a coupling sleeve which is arranged in a center location between the loose gears and is selectively connectable with the loose gears while transmitting torque, the coupling sleeve being non-rotatable with respect to the sun gear.
Dependencies are inferred from the claim text.