Meterless hydraulic system having flow sharing and combining functionality
First Claim
Patent Images
1. A hydraulic system comprising:
- a variable-displacement first pump;
an over-center variable-displacement first travel motor selectively connected to receive fluid pressurized by the first pump in a closed loop manner;
an over-center variable-displacement second travel motor selectively connected to receive fluid pressurized by the first pump in parallel with the first travel motor in a closed loop manner;
a linear actuator selectively connected to receive fluid pressurized by the first pump in parallel with the first and second travel motors in a closed loop manner;
at least one first isolation valve configured adjust a flow of the pressurized fluid from the first pump to the first travel motor; and
at least one second isolation valve configured adjust a flow of the pressurized fluid from the first pump to the second travel motor.
1 Assignment
0 Petitions
Accused Products
Abstract
A hydraulic system includes a variable-displacement first pump, an over-center variable-displacement first travel motor selectively connected to receive fluid pressurized by the first pump in a closed loop manner, and an over-center variable-displacement second travel motor selectively connected to receive fluid pressurized by the first pump in parallel with the first travel motor in a closed loop manner. The hydraulic system also includes a linear actuator selectively connected to receive fluid pressurized by the first pump in parallel with the first and second travel motors in a closed loop manner.
78 Citations
18 Claims
-
1. A hydraulic system comprising:
-
a variable-displacement first pump; an over-center variable-displacement first travel motor selectively connected to receive fluid pressurized by the first pump in a closed loop manner; an over-center variable-displacement second travel motor selectively connected to receive fluid pressurized by the first pump in parallel with the first travel motor in a closed loop manner; a linear actuator selectively connected to receive fluid pressurized by the first pump in parallel with the first and second travel motors in a closed loop manner; at least one first isolation valve configured adjust a flow of the pressurized fluid from the first pump to the first travel motor; and at least one second isolation valve configured adjust a flow of the pressurized fluid from the first pump to the second travel motor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
-
16. A hydraulic system comprising:
-
a variable-displacement first pump; a variable-displacement second pump; an over-center variable-displacement first travel motor selectively connected to receive fluid pressurized by the first pump in a closed loop manner; an over-center variable-displacement second travel motor selectively connected to receive fluid pressurized by the first pump in parallel with the first travel motor in a closed loop manner; a linear actuator selectively connected to receive fluid pressurized by the first pump in parallel with the first and second travel motors in a closed loop manner; a third motor selectively connected to receive fluid pressurized by the second pump in a closed loop manner; and at least one combiner device configured to selectively allow pressurized fluid from the first pump to combine with pressurized fluid from the second pump so that a combined flow from the first and second pumps is supplied to at least one of the first travel motor, the second travel motor, the third motor, and the linear actuator. - View Dependent Claims (17)
-
-
18. A method of operating a hydraulic system, the method comprising:
-
pressurizing fluid with a first variable-displacement pump, the first pump being capable of simultaneously supplying pressurized fluid in parallel to an over-center variable-displacement first travel motor, an over-center variable-displacement second travel motor, and a linear actuator; selectively directing fluid pressurized by the first pump in parallel to at least two of the first travel motor, the second travel motor, or the linear actuator in a closed loop manner; returning the pressurized fluid to the first pump; pressurizing fluid with a second variable-displacement pump, the second pump being capable of simultaneously supplying pressurized fluid in parallel to the first travel motor, the second travel motor, the linear actuator, and a variable-displacement third, motor; and selectively directing fluid pressurized by the second pump in parallel to at least two of the first travel motor, the second travel motor, or the linear actuator in a closed loop manner via at least one combiner device.
-
Specification