Construction machinery
First Claim
Patent Images
1. A hybrid construction machine comprising:
- an engine;
a generator connected to be driven by said engine;
a battery connected to store surplus electric power from said generator; and
a plurality of hydraulic pumps for operating a plurality of hydraulic actuators and actuated by separate electric motors connected to receive electric power from said generator, wherein a number of revolutions of each of said electric motors is controlled by a controller, whereby a discharge rate in each of said hydraulic pumps is controlled.
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Accused Products
Abstract
First and second hydraulic pumps each adapted to operate plural actuators are activated by separate electric motors respectively. In accordance with signals provided from a controller on the basis of operations of levers, the number of revolutions of the electric motor and that of the electric motor are controlled each independently and simultaneously to control the discharge rates of both hydraulic pumps.
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Citations
18 Claims
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1. A hybrid construction machine comprising:
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an engine;
a generator connected to be driven by said engine;
a battery connected to store surplus electric power from said generator; and
a plurality of hydraulic pumps for operating a plurality of hydraulic actuators and actuated by separate electric motors connected to receive electric power from said generator, wherein a number of revolutions of each of said electric motors is controlled by a controller, whereby a discharge rate in each of said hydraulic pumps is controlled. - View Dependent Claims (18)
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2. A hybrid construction machine comprising:
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an engine;
a generator connected to be driven by said engine;
a battery connected to store surplus electric power from said generator;
hydraulic actuators;
a hydraulic pump adapted to operate said hydraulic actuators;
an electric motor connected to receive electric power from said generator and adapted to actuate said hydraulic pump;
control valves disposed between said hydraulic pump and said hydraulic actuators to control a supply and discharge of pressure oil to and from said hydraulic actuators;
operating means adapted to issue operation commands to said control valves by an exterior operation; and
a controller adapted to control an operation stroke of each of said control valves and the number of revolutions of said electric motor in accordance with operation of said operating means. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12)
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3. A hybrid construction machine comprising:
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an engine;
a generator connected to be driven by said engine;
a battery connected to store surplus electric power from said generator;
hydraulic actuators;
hydraulic pumps adapted to operate said hydraulic actuators separately;
electric motors connected to receive electric power from said generator and adapted to actuate said hydraulic pumps separately;
control valves disposed between said hydraulic pumps and said hydraulic actuators to control a supply and discharge of pressure oil to and from the hydraulic actuators; and
operating means adapted to issue operation commands to said control values by an exterior operation; and
a controller adapted to control an operation stroke of each of said control valves and the number of revolutions of each of said electric motors in accordance with operation of said operating means.
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13. A hybrid construction machine wherein an upper rotating body is mounted on a lower traveling body so as to be rotatable about a vertical axis thereof and a working attachment including a boom, an arm secured to a front end of said boom, and a bucket secured to a front end of said arm, is mounted to said upper rotating body so that it can be raised and lowered, said construction machine comprising:
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an engine;
a generator connected to be driven by said engine;
a battery connected to store surplus electric power from said generator;
a boom cylinder, an arm cylinder, a bucket cylinder, said boom cylinder, said arm cylinder and said bucket cylinder being adapted to actuate said boom, said arm and said bucket respectively in a separate manner, a first pump serving as an oil pressure source for said boom cylinder, a second pump serving as an oil pressure source for both said arm cylinder and said bucket cylinder, control valves disposed between said second pump and said arm and bucket cylinders, a first electric motor for activating said first pump, and a second electric motor for activating said second pump, said first and second electric motors being connected to receive electric power from said generator, said boom cylinder being controlled in its operating direction and speed by rotational direction and speed of said first electric motor, said arm cylinder and said bucket cylinder being controlled in their operating speeds by a rotational speed of said second electric motor and by said control valves and being controlled their operating directions by said control valves. - View Dependent Claims (14, 15, 16, 17)
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Specification