Closed circuit hydraulic control system
AssigneeCanada Wire and Cable Limited
InventorsUrs Leuenberger, Rodney Lash LeRoy
Life of this patent
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Abstract
A closed circuit hydraulic control system for an hydraulic motor including a cylinder, a piston movable in such a cylinder, and a rod connected to one side of the piston, such cylinder having a blind end and a rod end through which the rod extends. A reversible circulating pump having two ports is provided for supplying fluid under pressure to the blind end and to the rod end respectively of the cylinder. A first tubing interconnects the blind end of the cylinder to one port of the reversible pump, whereas a second tubing interconnects the rod end of the cylinder to the other port of the reversible circulating pump. Means are provided to accommodate the volume of fluid displaced by the rod as the piston is moved toward the blind end of the cylinder.
Claims7
A closed circuit hydraulic control system comprising:
- A. an hydraulic motor including a cylinder, a piston movable in said cylinder and a rod connected to one side of said piston, said cylinder having a blind end and a rod end through which said rod extends;
- b. a reversible circulating pump having two ports for supplying fluid under pressure to said blind end and to said rod end respectively of said cylinder;
- c. a first tubing defining a first closed path connecting the blind end of the cylinder to one port of the reversible pump;
- d. a second flexible tubing defining a second closed path connecting the rod end of the cylinder to the other port of the reversible pump, said second flexible tubing having suitable elasticity and length for accommodating by expansion the volume of fluid displaced by said rod as the piston is moved towards the blind end of the cylinder, said displaced volume of fluid being up to 0.5 cu. in.
A closed circuit hydraulic control system comprising:
- a. an hydraulic motor including a cylinder, a piston movable in said cylinder and a rod connected to one side of said piston, said cylinder having a blind end and a rod end through which said rod extends;
- b. a reversible circulating pump having two ports for supplying fluid under pressure to said blind end and to said rod end respectively of said cylinder;
- c. a first tubing defining a first closed path connecting the blind end of the cylinder to one port of the reversible pump;
- d. a second tubing defining a second closed path connecting the rod end of the cylinder to the other port of the reversible pump;
- and
- e. seal means inserted in said second closed path for sealing the rod end of said cylinder and for accommodating the volume of fluid displaced by said rod as the piston is moved towards the blind end of the cylinder, said displaced volume of fluid being up to 0.5 cu. in.
Dependencies are inferred from the claim text.