SHIN CATERPILLAR MITSUBISHI LTD. Patent applications |
Patent application number | Title | Published |
20100161175 | METHOD AND SYSTEM FOR DIAGNOSING A MACHINE - A machine diagnosing system is provided which can make an abnormality/failure diagnosis of a machine without using threshold values. It is composed of a dynamic state management controller that creates frequency distribution information showing a relationship between signal intensity related to engine output and occurrence frequency whenever the machine body is operated for a predetermined time, a management section that receives and stores pieces of frequency distribution information, and terminal equipment and each of which detects a decrease in engine output by arranging the pieces of frequency distribution information obtained from the management section in time series and by comparing these pieces of information with each other. A decrease in engine output can be detected, without using threshold values, by comparison between the pieces of frequency distribution information stored concerning the output of the engine, unlike a case in which the abnormality/failure of the machine is determined by comparison with a conventional threshold value or in which the degree of such abnormality is ranked by comparison there. | 06-24-2010 |
20100134934 | STARTER MOTOR CONTROL CIRCUIT - Provided is a starter motor control circuit capable of easily preventing the induction of a short-circuit current due to a ground fault in the power source line of a starter motor, in which a high current flows. A key switch ( | 06-03-2010 |
20100107623 | HYDRAULIC SYSTEM HAVING AN EXTERNAL PRESSURE COMPENSATOR - A hydraulic system for a machine is disclosed. The hydraulic system has a source of pressurized fluid and a fluid actuator with a first chamber. The hydraulic system also has a first valve configured to selectively fluidly communicate the source with the first chamber. The first valve further includes a first element movable between a flow passing, at which fluid from the source flows to the first chamber, and a flow blocking position, at which fluid from the source is blocked from the first chamber and a second element configured to selectively drain a control passageway associated with the first element to cause the first element to move. The hydraulic system further has a proportional pressure compensating valve configured to control a pressure of a fluid directed between the source and the first valve dependent upon the pressure of the control passageway. | 05-06-2010 |
20100104818 | PANEL AND METHOD FOR MANUFACTURING THE SAME - A panel that realizes satisfactory strength, weight reduction and acoustic performance. Panel ( | 04-29-2010 |
20100000367 | WORK MACHINE - In a work machine equipped with a switchover means enabling selective operation of traveling devices and a work device by means of common operating levers, switchover can easily be performed and also easily recognized. In a work machine having traveling devices and a work device, operating levers that are capable of operating the traveling devices and the work device are respectively disposed at the sides of an operating seat. A foot switch connected to a controller is disposed in the proximity of and operable with a foot of an operator seated at the operating seat. While the foot switch is being operated with the foot, the traveling devices are operated by the operating levers through the controller. While the foot switch is not being operated, the work device is operated by means of the operating levers through the controller. | 01-07-2010 |
20090308068 | CONTROL CIRCUIT FOR CONSTRUCTION MACHINE - Boom operating valves, a stick operating valve, etc. for respectively controlling hydraulic fluid fed from hydraulic pumps to boom cylinders, a stick cylinder, and other actuators are provided with center by-pass lines Cb. A stick-in meter-out load pressure compensating valve is provided on a rod-side return line, which extends from a rod side of the stick cylinder to a tank. A pressure sensor is provided at the rod side of the stick cylinder so as to detect pressure of hydraulic fluid fed to the rod side. The center by-pass line Cb associated with the stick operating valve is provided with an electromagnetic relief valve for controlling the pressure in the portion of the center bypass line downstream from the stick operating valve so as to increase the pressure in accordance with. | 12-17-2009 |
20090288408 | HYDRAULIC CIRCUIT, ENERGY RECOVERY DEVICE, AND HYDRAULIC CIRCUIT FOR WORK MACHINE - A hydraulic circuit that enables smooth absorption of the energy of a return fluid from a hydraulic actuator by means of an energy recovery motor. A return fluid passage to which the fluid discharged from a boom cylinder is branched is provided at the tank passage side of a solenoid valve of a boom control circuit. The return fluid passage comprises two return passages, which are provided with a flow rate ratio control valve for controlling a ratio of fluid that branches off into the return passages. The flow rate ratio control valve is comprised of a solenoid valve disposed in the return passage, which is provided with an energy recovery motor, and a solenoid valve disposed in the return passage, which branches off the upstream side of the solenoid valve. | 11-26-2009 |
20090217653 | Control system for recovering swing motor kinetic energy - This disclosure relates to a hydraulic system and method that converts the kinetic energy generated by the operation of a swing motor into hydraulic potential energy and reuses the hydraulic potential energy for swing motor acceleration. An accumulator can be provided for storing exit oil from the swing motor that is pressurized by the inertia torque applied on the moving motor via movement of an upper structure of a machine. The pressurized oil in the accumulator can be reused to accelerate the swing motor by supplying pressurized oil to the swing motor. | 09-03-2009 |
20090159143 | FLUID PRESSURE CIRCUIT - A fluid pressure circuit that can, in either case where a first actuator that is fed from a first pump or a second actuator that is fed from a second pump is operated, by allowing feeding of the hydraulic fluid to a specific actuator from either the first or second pump, improve interlockability with the specific actuator. A control valve is incorporated with a plurality of first-group spools fed from a drive pump and a plurality of second-group spools fed from an idle pump. A solenoid selector valve unit switches a pilot line of a second-group tool controlling spool to a communicating state at the time of detection of a spool operation by a first pressure switch and switches a pilot line of a first-group tool controlling spool to a communicating state at the time of detection of a spool operation by a second pressure switch. | 06-25-2009 |
20090114298 | VALVE CONTROL UNIT - A valve control unit that prevents a decline in interlocking operation performance when pilot pressure control of a plurality of pilot-operated control valves is carried out by proportional solenoid valves. First and second proportional solenoid valves include a Common Operation Table of lever operation amount/boom-up pilot pressure characteristics and are inputted with a common boom-up lever operation amount. A third proportional solenoid valve also includes the Operation Table and is inputted with a stick-in lever operation amount common to the fourth proportional solenoid valve. The fourth proportional solenoid valve includes an Operation Table of lever operation amount/stick-in pilot pressure characteristics different from that of the first, second, and third proportional solenoid valves and is inputted with the stick-in lever operation amount common to the third proportional solenoid valve. | 05-07-2009 |
20090077837 | WORK MACHINE - A boom control circuit for controlling hydraulic fluid fed to a boom cylinder is provided separately and independently from a travel/stick/bucket control circuit, which serves to control hydraulic fluid fed to travel motors, a stick cylinder, and a bucket cylinder. The boom control circuit includes a boom pump, an energy recovery motor disposed in a return passage through which return fluid from the boom cylinder | 03-26-2009 |
20090048743 | WORK MACHINE - To provide a work machine in which traveling devices and an implement device can be operated by common operating levers, wherein switching operation is easy and a changeover is easily confirmed. Inside a cab of the work machine, there are provided travel pedals, with which the traveling devices can be operated, and operating levers, with which the traveling devices and the implement device can be operated. A changeover switch is provided on a console positioned in the vicinity of one side of an operating sheet. The changeover switch switches over between a traveling mode, in which traveling operation is possible by the operating levers, and a work mode, in which implement operation is possible by the operating levers. The work machine has a controller which makes it possible to work by the operating levers when the travel pedal is not stepped on in the case where the work mode or traveling mode is selected by the changeover switch, and makes it possible to travel by the operating levers only when the travel pedal is stepped on in the case where the traveling mode is selected by the changeover switch. | 02-19-2009 |
20090036264 | WORK MACHINE - A work machine enabling a hybrid drive system to be directly driven by energy contained in a return fluid discharged from a hydraulic actuator. The work machine includes a hydraulic actuator control circuit and a swing control circuit. The hydraulic actuator control circuit serves to control hydraulic fluid supplied from pumps of a hybrid drive system to travel motors and work actuators. The swing control circuit serves to control a swing motor generator, which functions as an electric motor and, during braking of rotating motion of the upper structure, functions as a generator. The hydraulic actuator control circuit includes an energy recovery motor provided in a return passage, through which return fluid recovered from a work actuator flows. The energy recovery motor is adapted to be driven by return fluid and thereby drive a motor generator of the hybrid drive system. | 02-05-2009 |
20080317574 | Swing Drive Device and Work Machine - The invention provides a swing drive device that is capable of energy conservation by limiting loss of hydraulic fluid pressure energy resulting from discharge of the hydraulic fluid pressure energy as thermal energy into the air during acceleration or deceleration of swinging action and transforming motion energy to electric energy during deceleration of swinging action, and also enables cost reduction by making components and parts compact. | 12-25-2008 |
20080314038 | Swing Drive Device and Work Machine - A swing control circuit is provided separately from a hydraulic actuator control circuit. The swing control circuit includes a swing pump motor connected to closed circuits of a swing motor through a solenoid valve that serves as a directional control valve. A swing motor generator is connected to the swing pump motor. The swing motor generator is connected to an electric power storage device of a hybrid type drive system. An exterior-connecting passage for feeding hydraulic fluid to hydraulic actuators of a lower structure and a work equipment is drawn from a pipeline between the swing pump motor and the solenoid valve. A connecting passage solenoid valve is disposed in the exterior-connecting passage. The invention enables hydraulic energy generated in the swing system to be directly fed to the outside of the swing system. | 12-25-2008 |
20080295508 | Force feedback poppet valve having an integrated pressure compensator - The force feedback poppet valve includes a valve body having a main chamber, a first port, and a second port. The force feedback poppet valve further includes a main poppet disposed within the main chamber and movable between an open position and a closed position to control fluid flow between the first port and the second port. The main poppet forms a control chamber within the main chamber. The force feedback poppet valve further includes a first passage communicating the control chamber with the second port, a second passage communicating the control chamber with the first port, and a pilot valve having a pilot poppet for controlling fluid flow between the control chamber and the first port through the second passage. The force feedback poppet valve further includes a pressure compensator disposed within the main poppet, and fluidly connected to the second port via the first passage. The force feedback poppet valve further includes a first spring coupled between the main poppet and the pilot poppet to provide a force proportional to a distance between the main poppet and the pilot poppet, and a second spring coupled between the pressure compensator and the pilot poppet to provide a force proportional to a distance between the pressure compensator and the pilot poppet. | 12-04-2008 |
20080257623 | Swing-Type Operation Machine - To realize a mounting structure on the rear side of the seat of the operator station on which the seat and equipment for operation are installed in the swing table of a swing-type operation machine, the mounting structure being simple in construction yet imparted with a sufficiently large strength without increasing the size of the swing table or without utilizing the counter weight. The swing-type operation machine comprises an under carriage, a swing table mounted on the under carriage so as to freely swing thereon, an operator station mounted on the swing table and on which a seat and equipment for operation are installed, and a heat exchanger-mounting body supporting a heat exchanger for cooling the engine that is positioned at the back of the seat of the operator station and supporting the rear part of the seat of the operator station. | 10-23-2008 |