Patent application number | Description | Published |
20140165543 | CONSTRUCTION MACHINE HYDRAULIC DRIVE SYSTEM HAVING EXHAUST GAS PURIFYING DEVICE - A construction machine hydraulic drive system that performs load sensing control is capable of efficiently burning and removing deposits on a filter in an exhaust gas purifying device through pump output increasing control and to be free from faults in the pump output increasing control even when an actuator is operated during the pump output increasing control. A solenoid switching valve is switched so that output pressure of an engine speed detecting valve is guided to a pressure receiving portion of an LS control valve and a pressure receiving portion of an unloading valve when a start of regeneration is not directed, and delivery pressure of a pilot pump is guided to the pressure receiving portion and the pressure receiving portion when the start of the regeneration is directed, to thereby disable load sensing control to increase capacity of a main pump and increase set pressure of the unloading valve. | 06-19-2014 |
20140174068 | HYDRAULIC DRIVE SYSTEM FOR CONSTRUCTION MACHINE - A hydraulic motor ( | 06-26-2014 |
20150027112 | HYDRAULIC DRIVE SYSTEM FOR CONSTRUCTION MACHINE - Pressure compensating valves not fully closing at the stroke end are employed, and upon the operators operation for the traveling, pilot primary pressure is reduced and supplied to remote control valves | 01-29-2015 |
20150040553 | HYBRID WORKING MACHINE - Pressure sensors are provided to detect the delivery pressure of a hydraulic pump, the output pressure of an engine revolution speed detecting valve, and the output pressure of a differential pressure reducing valve generating the differential pressure between the delivery pressure of the hydraulic pump and a maximum load pressure. A vehicle controller calculates virtually the displacement of the hydraulic pump by use of the detected pressures and an equation of motion about a swash plate of the hydraulic pump, calculates the power need of the hydraulic pump and the output of the engine using these values, and switches a motor between powering and generation control in accordance with the result of a comparison between the pump power need and the engine output. In this manner, the displacement of the hydraulic pump without using sensors to detect the tilting angle of the swash plate of the hydraulic pump. | 02-12-2015 |
20150240455 | Hydraulic Driving System for Construction Machine - Control valves | 08-27-2015 |
20150330415 | Hydraulic Drive System for Construction Machine - An object of the invention is to achieve a travel speed known in the art during travelling operation, improve energy efficiency by reducing energy loss, and obtain favorable travel operability less susceptible to effects from variations in a travel load and changes in a pump delivery pressure when travelling operation is performed through operation of a travel lever over a half stroke range or less. A variable restrictor valve | 11-19-2015 |
20150377258 | Hydraulic Drive System for Construction Machine - In addition to a main pump | 12-31-2015 |
20160115974 | HYDRAULIC DRIVE SYSTEM FOR CONSTRUCTION MACHINE - To cope with a variety of flow rate balance required of two actuators flexibly in combined operations driving two actuators of high maximum demanded flow rates at the same time while suppressing the wasteful energy consumption caused by the throttle pressure loss in a pressure compensating valve, the arrangement is such that when the demanded flow rate of a boom cylinder | 04-28-2016 |