Patent application number | Description | Published |
20130197768 | HYBRID CONSTRUCTION MACHINE - [Problem] To provide a hybrid construction machine which can provide the same operation feeling as an ordinary construction machine that is not hybrid without changing the discharge flow rate of a hydraulic pump even when the rotation speed of an engine is changed according to power absorbed by the hydraulic pump. | 08-01-2013 |
20130300128 | MOTIVE POWER REGENERATION SYSTEM FOR WORKING MACHINE - A motive power regeneration apparatus for a working machine includes a regeneration circuit that is connected to a hydraulic line through which a returning fluid of a boom cylinder is distributed during a boom lowering operation. Also included are a hydraulic motor connected to a generator, a flow regulating circuit that is connected to the hydraulic line and provided with a control valve, an inverter that controls the flow rate on the regeneration circuit in accordance with a first flow rate setting which varies with the operation amount of an operating apparatus, and a control valve and a proportional valve that control the flow rate on the flow regulating circuit in accordance with a second flow rate setting which varies with the operation amount of the operating apparatus. Therefore, the motive power regeneration apparatus is capable of making an operator constantly feel comfortable with the working machine operations. | 11-14-2013 |
20130312399 | SYSTEM FOR DRIVING WORKING MACHINE - The present invention provides a system for driving a working machine, while the system achieves high energy saving, the system improving installability by downsizing hydraulic pumps and motors, and having extensibility enabling an attachment to be easily added. A system for driving a working machine according to the invention includes: a plurality of hydraulic closed circuits that connect hydraulic pumps to hydraulic actuators in a closed circuit manner; hydraulic open circuit that connects a hydraulic pump to hydraulic actuators in an open circuit manner; first assist circuits that connect between the hydraulic closed circuits so as to cause a hydraulic fluid to be mutually supplied between the hydraulic closed circuits; and second assist circuits that connect the hydraulic closed circuits to the hydraulic open circuit so as to cause the hydraulic fluid to be supplied from the hydraulic closed circuits to the hydraulic open circuit. | 11-28-2013 |
20130317710 | SYSTEM FOR CONTROLLING CONSTRUCTION MACHINE - To provide a system for controlling a construction machine, which can be implemented inexpensively, can detect a failure in any of pressure sensors, controllers, an inverter device, and an electric motor for swing, and can secure safety and required workability for an operator. | 11-28-2013 |
20140020375 | HYDRAULIC WORKING MACHINE - A hydraulic working machine has an assist electric motor connected to an engine and a hydraulic pump. The emissions of air pollutants in the exhaust gas from the engine are minimized regardless of fluctuations in the load torque of the hydraulic pump. A specific revolution speed suitable for reducing the emissions of air pollutants is stored, and an engine is controlled using the specific revolution speed as a target revolution speed. The absorption torque of a hydraulic pump is subjected to high-pass filtering whereby a high-frequency component devoid of a trend component is obtained. Target assist torque is computed from the high-frequency component, and the assist electric motor is subjected to power running/generation control accordingly. A specific output torque range suitable for reducing the emissions of air pollutants is stored, and the target assist torque is corrected so that the trend component does not exceed the specific output torque range. | 01-23-2014 |
20140090367 | POWER REGENERATION DEVICE FOR OPERATING MACHINE - A power regeneration device for an operating machine has a hydraulic cylinder and a return line through which fluid returning to a tank flows when the hydraulic cylinder contracts. The return line branches into a plurality of hydraulic lines through a branching part and includes a regeneration line that which leads returning fluid to the tank via a hydraulic motor to which a generator is connected. A control valve line is connected to the branching part and leads the returning fluid to the tank via a control valve. An electricity storage device stores electric power generated by the generator, and an electric amount detector detects the electric amount of the electricity storage device. A flow rate calculator calculates the flow rate of the returning fluid flowing through the regeneration line and the flow rate of the returning fluid flowing through the control valve line depending on an electric amount signal. | 04-03-2014 |
20140283508 | DRIVE SYSTEM FOR HYDRAULIC CLOSED CIRCUIT - A drive system suppresses cylinder speed fluctuation at times of load inversion in a hydraulic closed circuit system in which a single rod cylinder is driven by a hydraulic pump. The drive system has a control device including: pressure detection means which detect pressure in a rod-side hydraulic chamber of the hydraulic cylinder and pressure in a head-side hydraulic chamber of the hydraulic cylinder; load calculation means which calculates the load on the hydraulic cylinder from the pressure in the rod-side hydraulic chamber and the pressure in the head-side hydraulic chamber; load switching means which calculates a first proportional gain in accordance with the polarity of the calculated load; and multiplication means which calculates a command signal by multiplying the calculated first proportional gain and an operation amount input from the operating device together and outputs the calculated command signal to the delivery flow rate control means. | 09-25-2014 |
20140371995 | WORK MACHINE - There is provided a hydraulic excavator including a hydraulic pump ( | 12-18-2014 |