ELECTRO-HYDRAULIC DRIVE SYSTEM FOR A WORK MACHINE
First Claim
1. An electro-hydraulic drive system for a work machine which drives a structure body by controlling a flow rate of a hydraulic fluid by a control valve, comprising:
- a supply device which includes a hydraulic pump driven by a driving power source, and a first electric motor, and supplies the hydraulic fluid;
a drive device which includes a hydraulic motor rotated by the hydraulic fluid supplied from the supply device, and a second electric motor, and drives the structure body; and
a controller which decides an operating state of the first electric motor and an operating state of the second electric motor, based on a load of the supply device and a load of the drive device.
1 Assignment
0 Petitions
Accused Products
Abstract
An electro-hydraulic drive system for a work machine which drives an upper rotary body by controlling a flow rate of a hydraulic fluid by a control valve, includes an electro-hydraulic pump including a hydraulic pump driven by an engine, and a first electric motor, and an electro-hydraulic motor including a hydraulic motor rotated by the hydraulic oil supplied from the electro-hydraulic pump, and a second electric motor, and a controller which determines an operating state of the first electric motor and an operating state of the second electric motor based on a load of the electro-hydraulic pump and a load of the electro-hydraulic motor, and is able to perform an efficient operation by using a hydraulic pressure (fluid pressure) and electric power.
-
Citations
16 Claims
-
1. An electro-hydraulic drive system for a work machine which drives a structure body by controlling a flow rate of a hydraulic fluid by a control valve, comprising:
-
a supply device which includes a hydraulic pump driven by a driving power source, and a first electric motor, and supplies the hydraulic fluid; a drive device which includes a hydraulic motor rotated by the hydraulic fluid supplied from the supply device, and a second electric motor, and drives the structure body; and a controller which decides an operating state of the first electric motor and an operating state of the second electric motor, based on a load of the supply device and a load of the drive device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
-
Specification