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US 2014/0196449 A1Published application
Hydraulic Drive Circuit
OwnerGerry Pettyinventor
Life of this patent
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Abstract
A hydraulic drive circuit using a variable displacement bi-directional pump with two (2) two speed motors enabling drive torque variation as required compensating for a changing load distribution on a machine encountering varying weight distributions at the two drives resulting from operating on slopes.
Claims18
In a hydraulically driven vehicle, a hydraulic drive circuit comprising:
- at least one bi-directional hydraulic pump in communication with a first hydraulic motor and a second hydraulic motor, wherein said first hydraulic motor drives a first drive, and
- wherein said second hydraulic motor drives a second drive,
- wherein each of said first and second hydraulic motors having a first displacement and a second displacement, and wherein said first displacement is lower than said second displacement,
- wherein said first hydraulic motor is set at said first displacement and said second hydraulic motor is set at said second displacement in order to overcome the shifting of a vehicle's weight distribution while operating on a slope in forward travel, and wherein said first hydraulic motor is set at said second displacement and said second hydraulic motor is set at said first displacement in order to overcome the shifting of the vehicle's weight distribution while operating on the slope in reverse travel, and
- displacement adjusting means for setting the displacement of said first and second hydraulic motors.
2 more elements
A hydraulic drive circuit comprising:
- separate drive means for applying torque to first and second drives of a vehicle,
- a first hydraulic motor for powering the first drive means,
- a second hydraulic motor for powering the second drive means, wherein each of said first and second hydraulic motors having a first displacement and a second displacement such that wherein said first displacement is lower than said second displacement,
- a bi-directional hydraulic pump in communication with said first and second hydraulic motors,
- a controller that is electrically disposed between a switch and said first and second hydraulic motors,
- wherein said controller receives first and second sensing signals to control the displacement of said first and second hydraulic motors,
- wherein a first sensor produces said first sensing signal in response to the rotational speed of said first drive, and a second sensor produces said second sensing signal in response to the rotational speed of said second drive.
4 more elements
Dependencies are inferred from the claim text.