Hydromechanical transmission

B - Operations – Transporting – 60 – K

Patent

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B60K 23/00 (2006.01) F16H 47/04 (2006.01) F16H 3/093 (2006.01) F16H 61/688 (2006.01)

Patent

CA 1118233

TITLE OF THE INVENTION HYDROMECHANICAL TRANSMISSION ABSTRACT OF THE DISCLOSURE A heavy duty hydromechanical transmission adapted for agricultural and industrial type tractors and for heavy duty construction type vehicles as well as line haul tractors is disclosed. The transmission utilizes an input shaft which is driven by a power source and drives dual planetary gear sets. These planetary gear assemblies are each geared to two separate variable displacement hydrostatic pump and/or motor units which are arranged in a closed hydrostatic fluid flow circuit. Each planetary gear set also drives a counter- shaft which is utilized as part of a multispeed transmission. The hydrostatic units are used as variable displacement pumps or motors to obtain smooth starting and to eliminate the need for a conventional master clutch normally used for starting a vehicle or for shifting gears. These units are also used to provide the high-starting torque through hydraulic torque regeneration. Hydrostatic transfer of power between fixed gear ratios (bases) creates an uninterrupted power flow over the entire speed range of the vehicle. Either or both of the hydrostatic units is available to be driven as a pump to provide high hydraulic line pressure for auxiliary hydraulic power take off devices such as concrete mixer drums, secondary vehicle drive axles, vehicle hoist mechanisms, etc. These units may be utilized as pumps to provide high levels of modulated dynamic braking horsepower. They may also be used to extend the limits of vehicle operation by providing a hydraulic over-drive which also allows an associated engine to operate at lower and quieter speeds and in a more efficient fuel economy range.

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