Electric drive system for track-laying vehicles
First Claim
Patent Images
1. An electrical drive system for track-laying vehicles comprising, in combination:
- A. a first electric motor for developing a first mechanical output;
B. a second electric motor for developing a second mechanical output; and
C. a transmission including1) a left output shaft drivingly connected to one vehicle track,2) a right output shaft drivingly connected to the other vehicle track,3) first and second variable stroke hydrostatic propulsion units commonly driven by said first mechanical output to produce respective infinitely variable speed first and second hydrostatic outputs,4) a left output combining gear set having a first gear element driven by said first hydrostatic output, a second gear element drivingly connected with said left output shaft, and a third gear element,5) a right output combining gear set having a first gear element driven by said second hydrostatic output, a second gear element drivingly connected with said right output shaft, and a third gear element,6) means for commonly applying said second mechanical output to said third gear elements of said left and right output gear sets, and7) a brake operating to ground said third gear elements of said left and right output gear sets to produce low range vehicle propulsion and steer and, with said second electric motor energized, to release said third gear elements of said left and right output gear sets to produce high range vehicle propulsion and steer.
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Abstract
An electric drive system for tracklaying vehicles includes a pair of electric motors and an infinitely variable speed, hydromechanical steering transmission including a pair of hydrostatic propulsion units and a plurality of planetary gears sets. The hydrostatic units are driven by one or both of the electric motors to produce separate hydrostatic propulsion outputs which are combined with the mechanical outputs of the motors by the planetary gear sets to generate separate hydromechanical propulsion outputs on right and left transmission output shafts for vehicle propulsion and steer in two speed ranges.
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Citations
16 Claims
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1. An electrical drive system for track-laying vehicles comprising, in combination:
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A. a first electric motor for developing a first mechanical output; B. a second electric motor for developing a second mechanical output; and C. a transmission including 1) a left output shaft drivingly connected to one vehicle track, 2) a right output shaft drivingly connected to the other vehicle track, 3) first and second variable stroke hydrostatic propulsion units commonly driven by said first mechanical output to produce respective infinitely variable speed first and second hydrostatic outputs, 4) a left output combining gear set having a first gear element driven by said first hydrostatic output, a second gear element drivingly connected with said left output shaft, and a third gear element, 5) a right output combining gear set having a first gear element driven by said second hydrostatic output, a second gear element drivingly connected with said right output shaft, and a third gear element, 6) means for commonly applying said second mechanical output to said third gear elements of said left and right output gear sets, and 7) a brake operating to ground said third gear elements of said left and right output gear sets to produce low range vehicle propulsion and steer and, with said second electric motor energized, to release said third gear elements of said left and right output gear sets to produce high range vehicle propulsion and steer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An electric drive system for track-laying vehicles comprising, in combination:
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A. a first electric motor; B. a second electric motor; and C. an infinitely variable speed hydromechanical steering transmission driven by said first and second electric motors and including 1) a pair of hydrstatic propulsion units driven by said first electric motor, 2) a left output shaft drivingly connected to one vehicle track, 3) a right output shaft drivingly connected to the other vehicle track, and 4) gearing means for combining respective hydrostatic outputs of said hydrostatic units produced by said first electric motor and mechanical outputs produced by said second electric motor to generate propulsion outputs on said left and right output shafts for propelling the vehicle in at least one of two speed ranges of straightline and steer propulsion. - View Dependent Claims (14, 15, 16)
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Specification