Construction machine
First Claim
Patent Images
1. A shovel, comprising:
- a lower-part traveling body;
an upper-part turning body turnably provided on the lower-part traveling body;
an engine provided on the upper-part turning body;
a first hydraulic pump configured to be driven by an output of the engine to supply hydraulic oil to a hydraulic actuator of a first system;
a second hydraulic pump configured to be driven by the output of the engine to supply the hydraulic oil to a hydraulic actuator of a second system; and
a hydraulic circuit that supplies the hydraulic oil flowing out from at least one of the hydraulic actuator of the first system and the hydraulic actuator of the second system to an intake side or a discharge side of at least one of the first hydraulic pump and the second hydraulic pump,wherein at least one of the first hydraulic pump and the second hydraulic pump operates as a hydraulic motor so as to assist the other of the first hydraulic pump and the second hydraulic pump that operates as a hydraulic pump, andwherein a check valve is provided between said at least one of the first hydraulic pump and the second hydraulic pump that operates as the hydraulic motor and a tank of the hydraulic oil on the intake side of said at least one of the first hydraulic pump and the second hydraulic pump that operates as the hydraulic motor to prevent the hydraulic oil from flowing to the tank.
1 Assignment
0 Petitions
Accused Products
Abstract
A construction machine includes a first hydraulic pump, a second hydraulic pump, and a hydraulic circuit. The first hydraulic pump supplies hydraulic oil to a hydraulic actuator of a first system. The second hydraulic pump supplies the hydraulic oil to a hydraulic actuator of a second system. The hydraulic circuit supplies the hydraulic oil flowing out from at least one of the hydraulic actuators of the first and second systems to the intake side or the discharge side of at least one of the first and second hydraulic pumps. At least one of the first and second hydraulic pumps operates as a hydraulic motor so as to assist the other of the first and second hydraulic pumps that operates as a hydraulic pump.
11 Citations
5 Claims
-
1. A shovel, comprising:
-
a lower-part traveling body; an upper-part turning body turnably provided on the lower-part traveling body; an engine provided on the upper-part turning body; a first hydraulic pump configured to be driven by an output of the engine to supply hydraulic oil to a hydraulic actuator of a first system; a second hydraulic pump configured to be driven by the output of the engine to supply the hydraulic oil to a hydraulic actuator of a second system; and a hydraulic circuit that supplies the hydraulic oil flowing out from at least one of the hydraulic actuator of the first system and the hydraulic actuator of the second system to an intake side or a discharge side of at least one of the first hydraulic pump and the second hydraulic pump, wherein at least one of the first hydraulic pump and the second hydraulic pump operates as a hydraulic motor so as to assist the other of the first hydraulic pump and the second hydraulic pump that operates as a hydraulic pump, and wherein a check valve is provided between said at least one of the first hydraulic pump and the second hydraulic pump that operates as the hydraulic motor and a tank of the hydraulic oil on the intake side of said at least one of the first hydraulic pump and the second hydraulic pump that operates as the hydraulic motor to prevent the hydraulic oil from flowing to the tank. - View Dependent Claims (2, 3, 4, 5)
-
Specification