Patent ID: 7059442
Filing Date: 2006-06-13
Classification: B60K,F16H

Abstract:
1. A drive assembly for four-wheel drive vehicles with front wheels and rear wheels, for tractors, agricultural machinery, construction machinery or for self-propelled machines, comprising: an engine; a first drive for driving the rear wheels; a second drive for driving the front wheels; an adjustable hydraulic pump driven by the engine; an adjustable first hydraulic motor drivingly connected to the first drive for driving the rear wheels and drivingly connectable to the second drive for driving the front wheels; and a second hydraulic motor drivingly connectable to the second drive for driving the front wheels; said first hydraulic motor having a high coefficient of efficiency within a first driving speed range of the vehicle and the second hydraulic motor having a high coefficient of efficency within a second driving speed range of the vehicle; and wherein the second driving speed range is above the first driving speed range, with an overlap existing between the first driving speed range and the second driving speed range.