Construction machine with hydraulic pipes
AssigneeSumitomo Heavy Industries, Ltd.
InventorKoichiro Tsukane
Life of this patent
Estimating the term…
Abstract
In a construction machine, a boom assist cylinder (7A) assists an operation of a boom (4) by a hydraulic pressure, and an arm assist cylinder (8A) assists an operation of an arm (5) by a hydraulic pressure. An accumulator (16) accumulates operation oil to be supplied to the boom assist cylinder and the arm assist cylinder in a pressurized state. A first hydraulic pipe (14) connects between the boom assist cylinder and the arm assist cylinder. A second hydraulic pipe (12) connects between the arm assist cylinder and the accumulator. The second hydraulic pipe is connected to a hydraulic connection port of the arm assist cylinder so that the operation oil is supplied in a direction of closing the arm from the accumulator to the arm assist cylinder.
Claims4
A construction machine that drives a work attachment by a boom and an arm, comprising:
- a boom assist cylinder that assists an operation of the boom by a hydraulic pressure;
- an arm assist cylinder that assists an operation of the arm by a hydraulic pressure;
- an accumulator that accumulates operation oil to be supplied to said boom assist cylinder and said arm assist cylinder in a pressurized state;
- a first hydraulic pipe connected between said boom assist cylinder and said arm assist cylinder;
- and
- a second hydraulic pipe connected between said arm assist cylinder and said accumulator via said first hydraulic pipe,
- wherein said first hydraulic pipe is connected to a hydraulic connection port of said arm assist cylinder such that the operation oil is supplied in a direction of closing said arm from said accumulator to said arm assist cylinder, and
- wherein the first hydraulic pipe is connected to the boom assist cylinder such that the operation oil is supplied in a direction of opening said boom from said arm assist cylinder to said boom assist cylinder.
A construction machine that drives a work attachment by a boom and an arm, comprising:
- a boom assist cylinder that assists an operation of the boom by a hydraulic pressure;
- an arm assist cylinder that assists an operation of the arm by a hydraulic pressure;
- an accumulator that accumulates operation oil to be supplied to said boom assist cylinder and said arm assist cylinder in a pressurized state;
- a first hydraulic pipe connected between said boom assist cylinder and said arm assist cylinder;
- and
- a second hydraulic pipe connected between said arm assist cylinder and said accumulator via said first hydraulic pipe,
- wherein said first hydraulic pipe is connected to a hydraulic connection port of said arm assist cylinder so that the operation oil is supplied in a direction of closing said arm from said accumulator to said arm assist cylinder,
- wherein accumulation of hydraulic pressure is performed when an output of an engine is low, and
- wherein the first hydraulic pipe is connected to the boom assist cylinder such that the operation oil is supplied in a direction of opening said boom from said arm assist cylinder to said boom assist cylinder.
Dependencies are inferred from the claim text.