Patent application number | Description | Published |
20090025661 | COOLING FAN DRIVE SYSTEM FOR TRAVEL TYPE WORKING MACHINE - In a cooling fan drive system for a travel type working machine, the rotational speed of a cooling fan is controlled to the optimum rotational speed in accordance with temperature increase of the temperature of an engine cooling water, and the engine rotational speed is smoothly increased when the engine rotational speed is increased under travel acceleration. A fourth fan target rotational speed calculator | 01-29-2009 |
20090255750 | STEERING SYSTEM FOR ENGINEERING VEHICLE - A priority valve | 10-15-2009 |
20100051376 | Bending Construction Vehicle - [Problem] To provide an articulated vehicle which permits steering control not only suited for traveling on general roadways but also suited for work at construction sites. | 03-04-2010 |
20100101888 | Steering Device For Construction Vehicle - [Problem] To provide a steering system for a construction vehicle, which is suited not only for traveling on general roadways but also for work at construction sites and can perform high-reliability steering control. | 04-29-2010 |
20100138118 | TRAVELING SYSTEM FOR ENGINEERING MACHINE - This invention provides a traveling system for an engineering machine, adapted to limit a maximum traveling speed of the machine without causing decreases in engineering work efficiency or in accelerating performance during a start of traveling, and to improve fuel efficiency by suppressing a loss of engine output horsepower under the limited state of the maximum traveling speed. | 06-03-2010 |
20100228439 | STEERING SYSTEM FOR ENGINEERING VEHICLE - A hydraulic steering unit | 09-09-2010 |
20110061755 | HYDRAULIC CIRCUIT SYSTEM FOR HYDRAULIC EXCAVATOR - A hydraulic circuit system for a hydraulic excavator, which has a hydraulic circuit for an attachment, includes: a directional control valve | 03-17-2011 |
20110113766 | Vehicular Back Processing System - An exhaust gas post-treatment system for a vehicle is provided, which in the course of regeneration ascertains whether or not there is any object approaching a body of the vehicle from behind. A filter is arranged in an exhaust passage of an engine to trap PM therein. A trapped and deposited PM amount sensing device senses a deposited amount of PM deposited in the filter. A fuel injector burns and removes PM deposited in the filter to conduct regeneration of the filter. A rearward monitoring camera monitors a scene rearward of a vehicle body. A display module displays monitoring information from the rearward monitoring camera, and a controller having a regeneration processing unit executes control processing to actuate the fuel injector and to perform regeneration. The controller includes a display continuation processing unit for executing control processing such that during the regeneration by the fuel injector, the monitoring information from the rearward monitoring camera is continuously displayed on a display screen of the display module. | 05-19-2011 |
20110192155 | Hydraulic Drive Device for Hydraulic Excavator - The operability when performing a combined arm-crowd and bucket operation can be improved. A hydraulic drive device for a hydraulic excavator includes: a bucket directional control valve and a second arm directional control valve, which are connected in parallel tandem with a first hydraulic pump; a first arm directional control valve that is connected to a second hydraulic pump; and a flow rate restriction device that restricts the flow rate of pressure oil supplied to the second arm directional control valve, during crowd operation of a bucket. This flow rate restriction device includes a variable throttle whose opening is controlled so as to become smaller as a bucket operating device is operated to the crowd side, the variable throttle being provided in a bypass path connecting to the supply port of the second arm directional control valve. | 08-11-2011 |
20110192156 | Hydraulic Drive Device for Construction Machine - A hydraulic drive device for a construction machine which can reliably judge whether or not the state of the construction machine is appropriate for stopping an engine is provided. The hydraulic drive device includes: a main pump | 08-11-2011 |
20110276235 | PRIME MOVER REVOLUTION SPEED CONTROL SYSTEM FOR HYDRAULIC CONSTRUCTION MACHINE - A prime mover revolution speed control system for a hydraulic construction machine sets the revolution speed of the prime mover in accordance with the operating state invoked by an operating command and as a result of a determination of an excavation state so that that the revolution speed of the engine can be increased for a heavy load (speedup) in the excavation state. When the control lever is fully operated in the direction of arm crowding, the control lever | 11-10-2011 |
20120000191 | Hydraulic Driving Device for Work Machine - Disclosed is a hydraulic drive system for a working machine, which enables to conduct forced regeneration continuously for a sufficient time. Based on an input of a lock detection signal S | 01-05-2012 |
20120003069 | Hydraulic Drive Apparatus for Construction Equipment - A hydraulic drive system for a working machine provides improved safety during forced regeneration. Upon input of a forced regeneration command signal from a forced regeneration switch, a controller detects non-operated states of all hydraulic actuators such as an arm cylinder arranged on a hydraulic excavator based on a lock detection signal from a gate lock detection switch, and also an attitude of a front working mechanism. The attitude is proper from the standpoint of safety. The detection is based on an arm angle signal from an arm angle sensor, a bucket angle signal from a bucket angle sensor and a boom pressure signal from a boom pressure sensor. Taking the detection of the non-operated states and proper attitude as conditions, the controller outputs control signals to a boosting proportional solenoid valve and flow-rate controlling, proportional solenoid valve to make a forced regenerator conduct forced regeneration. | 01-05-2012 |
20120163949 | Hydraulic Drive Device for Hydraulic Working Machine - A hydraulic drive system realizes a jack-up operation without arrangement of a flow rate control valve and center bypass selector valve. The hydraulic drive system has first and second hydraulic pumps, first and second directional control valves for controlling boom cylinders, a third directional control valve for controlling the boom cylinders, and a third hydraulic pump for feeding pressure oil to the third directional control valve. A jack-up selector valve has a second select position where, when a pressure in bottom chambers of the boom cylinders is not higher than a predetermined pressure, feeding of pressure oil, which is delivered from the first hydraulic pump and second hydraulic pump, to rod chambers of the boom cylinders, is held permissible in association with switching of the second directional control valve and third directional control valve by a manipulation of a control device. | 06-28-2012 |
20120163996 | Hydraulic Drive Device of Hydraulic Operating Machine - A hydraulic drive system for a hydraulic working machine sets a delivery pressure at a preset value upon raising a temperature of exhaust gas to a temperature needed for combustion of particulate matter by increasing a load to be applied to an engine. In a non-operation state, a variable restrictor is controlled by a controller and a delivery pressure control valve to increase a delivery pressure of a variable displacement hydraulic pump, so that the load is increased to raise the temperature of exhaust gas to the temperature needed for the particulate matter combustion. At this time, the controller controls the delivery pressure control valve such that a delivery pressure to be detected by a delivery pressure sensor will conform with a preset reference delivery pressure. The reference delivery pressure is set to a minimum pressure that can provide the exhaust gas with combustion heat. | 06-28-2012 |
20120260637 | Hydraulic Driving Device for Working Machine - A hydraulic driving device for a working machine surely prevents behavior of a single rod double acting cylinder not intended by an operator when discharge pressure of a main pump is raised to raise exhaust gas temperature to temperature required for burning particulate matter. A selector valve | 10-18-2012 |
20120279203 | EXHAUST GAS PURIFICATION SYSTEM FOR HYDRAULIC OPERATING MACHINE - When an output value of an exhaust resistance sensor | 11-08-2012 |
20120285157 | PUMP CONTROL UNIT FOR HYDRAULIC SYSTEM - During a swing start, a pump torque calculating section associated with pump delivery pressure, a pump torque calculating section associated with swing operation pressure, and a maximum value selecting section of a controller perform control to change a maximum absorption torque of a second hydraulic pump between Tb and Tc in accordance with a delivery pressure of the second hydraulic pump. In an operation combining swing with other motion, a subtraction section performs a calculation to subtract a maximum absorption torque Tp | 11-15-2012 |
20120291427 | ATTACHMENT CONTROL APPARATUS FOR HYDRAULIC EXCAVATOR - In an attachment control apparatus for a hydraulic excavator having a hydraulic circuit that includes a hydraulic pump, a plurality of actuators having a breaker which is an attachment actuator, and a plurality of flow control valves having an attachment flow control valve that is switched by operation pilot pressure from a control pedal device to supply delivery fluid of the hydraulic pump to the attachment actuator, if the control pedal device is operated in a state where an attachment mode is not selected by an attachment selection device, the movement of the attachment actuator is limited. Thus, failure and reduced life of the attachment and other hydraulic devices can be prevented in the event that an operator has forgotten to switch from a normal mode to an attachment mode and has operated the attachment. | 11-22-2012 |
20120310492 | Hydraulic Work Machine - A hydraulic working machine, typically a hydraulic excavator has a travel speed control unit and a boost control unit. The travel speed control unit includes a traveling, hydraulic pressure oil feed unit capable of feeding pressure oil to actuate traveling tilt-angle control devices. The boost control unit includes a boosting, hydraulic pressure oil feed unit capable of feeding pressure oil to actuate an adjustable relief valve. A single hydraulic pressure oil feed unit is commonly usable as the traveling, hydraulic pressure oil feed unit and the boosting, hydraulic pressure oil feed unit, and includes lines communicating with both of the traveling tilt-angle control devices and the adjustable relief valve, a solenoid valve for opening or closing these lines, and a controller for outputting a control signal to control the solenoid valve. | 12-06-2012 |
20130190994 | CONTROL UNIT FOR CONSTRUCTION MACHINE - A target speed setting section sets a target speed of an engine to an idle speed that is lower than an input speed with an engine control dial when no operating signal is output from a control lever over a predetermined period of time. A speed control section controls the speed of the engine based on the target speed set by the target speed setting section, which includes an idle speed setting section that corrects the idle speed according to values detected by sensors so that reduction in an output of the engine due to a change in a state quantity associated with an environment under which the engine is placed can be inhibited. This allows a good operating condition to be achieved during a reset from an auto idle state even with an engine output has been reduced according to a change in environment. | 07-25-2013 |
20130263587 | Relief Pressure Control Device for Hydraulic Work Machine - A relief pressure control system is provided with a controller for outputting, responsive to an adjustment signal output from a dial switch, a control signal to control a relief pressure of a variable solenoid relief valve, a display unit for displaying, responsive to display signals outputted from the controller, a relationship between a circuit pressure output from a pressure sensor and a pressure required by a hydraulic cylinder, and a control device constituting a start instruction unit for instructing a start of control of the variable solenoid relief valve. Stop valves are arranged in sections of main lines, which communicate a directional control valve and the hydraulic cylinder with each other, to open or close the section. The sections are located between positions on the main lines, where the variable solenoid relief valves are connected to the main lines, respectively, and the hydraulic cylinder. | 10-10-2013 |
20130276922 | Aqueous Urea Tank Structure for Construction Machine - An aqueous urea tank structure is provided for a construction machine, in which a temperature rise of the aqueous urea within the tank can be suppressed and the load applied to the tank due to vibration of a vehicle body can be reduced. The aqueous urea tank structure including an aqueous urea tank which is disposed within a revolving upperstructure of a hydraulic excavator to store aqueous urea that purifies the exhaust gas discharged from an engine, wherein the aqueous urea tank structure further includes a securing member which encloses the periphery of the aqueous urea tank to secure the aqueous urea tank within the revolving upperstructure, and heat insulating materials which are interposed between the securing member and the aqueous urea tank to hold the aqueous urea tank. The securing member contains a box. | 10-24-2013 |
20130294876 | Construction Machine - To provide a construct ion machine in which the temperature of a battery and aqueous urea within an aqueous urea tank can be prevented from rising and high stability can be secured in the vehicle body. | 11-07-2013 |
20130319787 | CONSTRUCTION MACHINE - On an upper revolving structure, an engine having an exhaust port is mounted. In the midway portion of the exhaust pipe connecting the exhaust port of the engine and an exhaust gas post-treatment device, a first bellows pipe and a second bellows pipe are arranged through a connecting pipe having an L-shaped bending portion. In this case, the first bellows pipe and the second bellows pipe are arranged so as to have a positional relationship in which axis lines thereof (X | 12-05-2013 |
20130343853 | CONSTRUCTION MACHINE - On a rear part side of a revolving frame ( | 12-26-2013 |
20140023473 | CONSTRUCTION MACHINE - On the right front side of a revolving frame ( | 01-23-2014 |
20140033699 | TRAVEL CONTROL DEVICE FOR WORK VEHICLE AND WORK VEHICLE - A travel control device for a work vehicle includes: a hydraulic pump; a plurality of hydraulic motors connected to the hydraulic pump in parallel through a closed-circuit connection, that drive different wheels with pressure oil delivered from the hydraulic pump; a slip detection device that detects a slip occurring at each of the wheels; and a flow control device that reduces, upon detection of a slip occurring at any of the wheels by the slip detection device, a quantity of pressure oil supplied to a hydraulic motor for driving the wheel at which the slip has been detected, among the plurality of hydraulic motors. | 02-06-2014 |
20140090369 | Hydraulic Drive Device for Working Machine - A hydraulic drive device for a hydraulic excavator, includes: a first hydraulic pump; a first boom directional control valve and a second arm directional control valve which are connected in parallel to the first pump; a second hydraulic pump; and a second boom directional control valve and a first arm directional control valve which are connected in parallel to the second pump; wherein: the hydraulic drive device also includes: a third hydraulic pump; a third boom directional control valve connected to the third pump and controlling the flow of pressure oil supplied to a boom cylinder; and a third arm directional control valve connected in tandem with the third boom directional control valve and controlling the flow of pressure oil supplied to an arm cylinder. | 04-03-2014 |