| Patent Number |
Title Of Patent |
Date Issued |
| 6183210 |
Torque control device for hydraulic pump in hydraulic construction equipment |
February 6, 2001 |
| A torque control system for a hydraulic pump in a hydraulic construction machine wherein if an engine output lowers due to change of the environment, modification gain calculating portions 70m-70u and a torque modification value calculating portion 70v receive signals detected by sen |
| 6183159 |
Automotive soil treating machine |
February 6, 2001 |
| A vehicular automotive soil treating machine having a main frame structure provided on an automotive drive means to support thereon a soil feeding stage including at least a soil hopper and an additive hopper for feeding soil and an additive soil improving material, a soil processing sta |
| 6176126 |
Engine speed control system for construction machine |
January 23, 2001 |
| An engine speed control system for a construction machine is arranged in association with its hydraulic circuit, which has main pumps, a communication line through which input ports of travel-controlling directional control valves are connected with each other, and a travel-controlli |
| 6171030 |
Soil improving machine with excavating means |
January 9, 2001 |
| A vehicular soil treating machine having a base carrier with a crawler type vehicle drive, an upper rotary body rotatably mounted on the base carrier, and an excavation means mounted on the upper rotary body and equipped with a soil excavating bucket. Provided on the base carrier is an e |
| 6170588 |
Revolving construction machine |
January 9, 2001 |
| A revolving construction machine includes a lower track structure, an upper revolving structure mounted on the lower track structure and a working device mounted to the front of the upper revolving structure. A floor panel portion is provided on the upper revolving structure. A walk-thro |
| 6169948 |
Front control system, area setting method and control panel for construction machine |
January 2, 2001 |
| A setting device for a front control system for a construction machine includes a direct setting switch for instructing a direct teaching setting, a numeral input key consisting of up- and down-keys for instructing a numeral input setting, a setting changeover switch for changing ove |
| 6164069 |
Hydraulic drive system for construction machine |
December 26, 2000 |
| Arranged on a side of a first pump are a flow control valve for controlling a first boom cylinder, a flow control valve for an arm, said flow control valve being connected in tandem with said flow control valve and being adapted to control an arm cylinder, and a flow control valve for a |
| 6142577 |
Hydraulic muck handling system for tunnel boring machine |
November 7, 2000 |
| A tunnel boring machine for collecting earth excavated upon rotation of a cutter disk includes a non-pressurized chamber behind the cutter disk for collecting earth excavated by the cutter disk and discharging the earth with a carrying fluid. The machine includes a first open tank arrang |
| 6135149 |
Pressure compensating valves |
October 24, 2000 |
| Pressure compensating valves disposed at inlet sides of directional control valves are each configured with a step-shaped spool having a larger diameter portion and smaller diameter portions and pressure receiving chambers are provided to sandwich the larger diameter portion such that a |
| 6122598 |
Measurement and display of load of excavating blasted ground |
September 19, 2000 |
| This invention relates to a measuring and display system for loads applied upon digging blasted earth, which can contribute to accurate blasting. An operating direction of a bucket of an excavator is detected by pressure switches 15,16, while a pressure P.sub.B in a bottom compartment 6S |
| 6119580 |
Swash plate type hydraulic rotating machine and method of manufacturing casing for same |
September 19, 2000 |
| At the time of casting a structural material for a casing, metal pipes to be used as passages to and from a tilt actuator of a swash plate are integrally embedded in a cast body of the structural material. In a casting stage of the structural material for the casing, metal pipes are |
| 6116872 |
Ripple reducing device |
September 12, 2000 |
| A ripple reducing device of the present invention for reducing ripple of oil flowing through a hydraulic line includes a closed line that diverges from the hydraulic line and is closed at a terminal end thereof, and at least one restrictor that divided the interior of the closed line int |
| 6112593 |
Portable non-destructive inspection device and support casing therefor |
September 5, 2000 |
| A non-destructive inspection device has an inspection unit body and a support casing which is used as a set-up type device by combining the inspection unit body and the support casing in ordinary inspection, and is used as a portable type device by separating them for special inspection |
| 6105707 |
Tired Roller |
August 22, 2000 |
| A tired roller is provided with a prime mover and a speed change unit of the HST type. The speed change unit includes an HST hydraulic pump of the variable displacement type driven by the prime mover and an HST hydraulic motor driven by pressure oil from the hydraulic pump, and can chang |
| 6105367 |
Hydraulic drive system |
August 22, 2000 |
| A hydraulic drive system wherein differential pressures across flow control valves are controlled by pressure compensating valves to become the same value, i.e., a differential pressure .DELTA.PLS, and the differential pressure .DELTA.PLS is maintained at a target differential pressure |
| 6101456 |
Output correcting method in control system, control system, and hydraulic pump control system |
August 8, 2000 |
| A control system wherein a reverse characteristic having a reverse input/output relationship to a target input/output characteristic of a control object, is preset, and a target value for an output of the control object is calculated. A command signal corresponding to the target value |
| 6087945 |
Pump failure alarm system for hydraulic working machine |
July 11, 2000 |
| A pump failure alarm system which is provided in a hydraulic working machine comprising hydraulic pumps driven by a prime mover, delivery lines joining with one another into one common delivery line on the downstream side, check valves provided in the delivery lines upstream of a point |
| 6079131 |
Operation control device for three-joint type excavator |
June 27, 2000 |
| Two control lever units 11, 12 for operating a first arm 3, a second arm 4 and a third arm 5 of a 3-articulation work front 2 are provided, and signals 132, 133 from the two control lever units are sent to a controller 131. On condition that a virtual 2-articulation type work front compr |
| 6076029 |
Slope excavation controller of hydraulic shovel, target slope setting device and slope excavatio |
June 13, 2000 |
| A slope excavation control system for a hydraulic excavator and a slope excavation method using a hydraulic excavator include an external reference 80 which extends horizontally in the direction of advance of a target slope face. A vertical distance hry and a horizontal distance hrx |
| 6074023 |
Guide roller assembly for crawler type vehicles and method for forming guide roller |
June 13, 2000 |
| A guide roller assembly for use in a guide roller mechanism of a crawler type vehicle, including a support shaft fixedly provided on a truck frame and a guide roller rotatably mounted on the support shaft through bearings. The guide roller has an integral unitary body structure of a |
| 6055851 |
Apparatus for diagnosing failure of hydraulic pump for work machine |
May 2, 2000 |
| This invention relates to a fault diagnosis system for hydraulic pumps in a work vehicle, which is economical and permits sure identification of one or more trouble-developed ones of the hydraulic pumps.Pressure sensors 61-64 are arranged on pressurized fluid lines 30,40, which extend to |
| 6033043 |
Crawler type drive apparatus |
March 7, 2000 |
| This invention is to suppress repeated striking noises as generated by a crawler belt (29) when taken up onto a drive sprocket (25) in a polygonally bent shape. A crawler belt support block (34) is fixedly mounted on top of an upper reinforcing plate (19) of a bracket (15) on the sid |
| 6021756 |
Engine control system for construction machine |
February 8, 2000 |
| The pump controller 40 determines pump load torques T.sub.r1, T.sub.r2 from tilting signals .theta..sub.1, .theta..sub.2 of hydraulic pumps 1, 2 and delivery pressure signals P.sub.D1, P.sub.D2 of the hydraulic pumps 1, 2 based on T.sub.r1 =K.multidot..theta..sub.1 .multidot.P.sub.D1 and |
| 6020651 |
Engine control system for construction machine |
February 1, 2000 |
| A pump controller (40) calculates a pump maximum absorbing horsepower and a pump required horsepower based on an accelerator signal, a pump delivery pressure and an operation signal, determines an engine required horsepower (PN) by selecting minimum one of both horsepower values, and cal |
| 6019569 |
Excavation machine |
February 1, 2000 |
| A swing type front working mechanism 7 is provided, the front working mechanism 7 having a foot portion of a lower boom 8L of a boom 8 pivotally supported on brackets 12a through a pin 18. A cross-link 40 is connected between the bracket 12a and an upper boom 8U by pins 41 and 42 only al |
| 5995886 |
System for estimating residual service time of work vehicle |
November 30, 1999 |
| A system for the estimation of residual service time of a work vehicle includes an arithmetic and logic unit which is inputted with an engine speed and a speed difference from a controller for an engine, with a signal, which indicates whether or not at least one of several control le |
| 5984036 |
Work machine with operator's cabin |
November 16, 1999 |
| A rear side of an operator's cabin body is resiliently supported by a rubber mount, and a front side of the operator's cabin body is resiliently supported by a spring mount, of which a spring constant is set to be smaller than that of the rubber mount. Accordingly, a vibration transm |
| 5975833 |
Swing type hydraulic excavator |
November 2, 1999 |
| An upper cover has a curved portion formed in its end portion on the side near a work front for avoiding interference with the work front. The curved portion comprises a recessed surface having a center axis aligned with the axis of a vertical pin of a swing post, a first stepped portion |
| 5974796 |
Hydraulic circuit system for hydraulic working machine |
November 2, 1999 |
| A regulator (20) comprises a servo piston 21 and a tilting control valve (22) which is made up of a spool (22a), a spring (22b), a control piston (22d) and a first pressure bearing chamber (22e). With these components, the regulator (20) controls a pump tilting such that a pump delivery |
| 5968104 |
Front control system for construction machine |
October 19, 1999 |
| An area where a front device (1A) is allowed to move is set beforehand and the operation of the front device is controlled so that the front device will not go out of the set area. For this control process, an arm cylinder speed calculating portion (9d) of a control unit (9) estimates an |
| 5965881 |
Scanning probe microscope and processing apparatus |
October 12, 1999 |
| This scanning probe microscope can accurately obtain information on surfaces of a sample when measuring the sample in a broad range from a slow scanning speed to a fast scanning speed. The scanning probe microscope comprises a cantilever (16) with a probe (15) at its tip, an optical |
| 5960378 |
Excavation area setting system for area limiting excavation control in construction machines |
September 28, 1999 |
| An excavation area setting system for area limiting excavation control in construction machines, with the excavation control being performed to calculate a target speed vector for control of a front device on the basis of a body, modify the target speed vector to limit a moving speed of |
| 5957989 |
Interference preventing system for construction machine |
September 28, 1999 |
| A calculating portion 7a calculates a distance from the tip end of a front device to an interference prevention area, and a detection line 7m detects a moving speed of a boom 1. If the tip end of the front device comes close to the interference prevention area when the boom 1 is moving u |
| 5957159 |
Directional control valve with flow distribution valves |
September 28, 1999 |
| A pair of directional control valves 8 and a pair of hold check valves 9 are disposed respectively between a pair of metering notches 6, which are formed in a land 4-1 of a spool 2 and have functions of both flow rate control and direction control, and a pair of actuator ports A, B. Each |
| 5940997 |
Hydraulic circuit system for hydraulic working machine |
August 24, 1999 |
| A hydraulic circuit system includes a shuttle block, and shuttle valves are arranged and connected within the shuttle block. The maximum pressure in a predetermined operation signal pressure group selected from operation signal pressures generated by pilot operating units is selected to |
| 5934879 |
Pump torque control system |
August 10, 1999 |
| An engine torque, which corresponds to a target engine speed inputted in a controller, is determined by a functional computing function unit. A torque correction value is added to the engine torque, followed by the multiplication with a constant. The product is divided by a pump delivery |
| 5930996 |
Auto-acceleration system for prime mover of hydraulic construction machine and control system fo |
August 3, 1999 |
| In the arm-crowding or track operation, a calculating portion (700d2 or 700d4) calculates a modification gain (KAC or KTR) depending on an operation pilot pressure and a calculating portion (700g) calculates a decrease modification (DND) based on the KAC or KTR, while a calculating p |
| 5927413 |
Crawler belt drive apparatus for crawler type vehicles |
July 27, 1999 |
| A crawler belt drive apparatus which can reduce meshing noises of drive sprocket and crawler belt in a reliable manner over a long period of time. An annular link guide member is provided on a housing of a reducer concentrically with the drive sprocket. As bushes of the respective track |
| 5921165 |
Hydraulic control system |
July 13, 1999 |
| In a hydraulic control system including a valve device B for controlling a hydraulic fluid supplied from a hydraulic pump A to a hydraulic cylinder C, the valve device comprises a spool 16 slidably fitted into a valve body 1, and a non-leak valve 27 for controlling communication of an ac |
| 5918527 |
Locus control system for construction machines |
July 6, 1999 |
| A locus control system of hydraulic excavators whereby a target locus for a front device is set beforehand. A control unit calculates a position and posture of the front device based on signals from angle sensors, and calculates a target speed vector of the front device based on signals |
| 5911506 |
Control system for prime mover and hydraulic pump of hydraulic construction machine |
June 15, 1999 |
| A reference pump-delivery-rate calculating portion calculates a reference delivery rate of a hydraulic pump by referring to a table stored in a memory based on a control pilot pressure for the hydraulic pump. A target pump-delivery-rate calculating portion divides the reference delivery |
| 5907951 |
Hydraulic control system for construction machine |
June 1, 1999 |
| A hydraulic control system according to the present invention for a construction machine is provided with a directional control valve switchable by a pilot control valve, a hydraulic cylinder, a pilot pump, a selector valve for selecting one of a maximum value out of pilot pressures |
| 5890303 |
Hydraulic by-pass circuit for a hydraulic shovel |
April 6, 1999 |
| A pilot pressure sensor detects a pilot pressure from an arm operating unit and outputs a pilot pressure signal. A drive signal corresponding to the pilot pressure signal is then outputted from a controller to a solenoid-operated proportional valve. Through the solenoid-operated prop |
| 5887365 |
Front control system for construction machine and oil temperature indicator |
March 30, 1999 |
| In an oil temperature detecting/calculating portion 9p, threshold values T.sub.1, T.sub.2 are set beforehand to divide a range of oil temperature into a first oil temperature range a representing the lowest level, a second oil temperature range b representing a relatively low level, and |
| 5884589 |
Cooling apparatus for heat exchanger |
March 23, 1999 |
| A cooling apparatus for a heat exchanger is used for the heat exchanger of an engine mounted on a hydraulic shovel machine and the like. This cooling apparatus has a fan rotated by the engine and a shroud accommodating the fan. The fan is a type of axial fan. The shroud has a fan surroun |
| 5878721 |
Engine control system for construction machine |
March 9, 1999 |
| The pump controller determines pump load torques (T.sub.r1, T.sub.r2) from tilting signals (.theta..sub.1, .theta..sub.2) of hydraulic pumps and delivery pressure signals ( P.sub.D1, P.sub.D2) of the hydraulic pumps based on T.sub.r1 =K.multidot..theta..sub.1 .multidot.P.sub.D1 and T |
| 5873245 |
Hydraulic drive system |
February 23, 1999 |
| Pressure adjusting valves (9A, 9B) control outlet pressures of variable throttle portions (8a) of directional control valves (8A, 8B) of closed center type to be kept substantially equal to a maximum load pressure detected by a detecting line (13). A variable throttle valve (40) and a |
| 5861577 |
Seal structure for member-passing-through hole bored in metal partition member |
January 19, 1999 |
| A seal structure in which a hole (5) is defined by a metal base member (4) as a partition member for partitioning the regions on the opposite sides thereof to a gas tight or liquid tight state and a member passes through the hole (5) and extends therefrom. The member passing through the |
| 5848531 |
Hydraulic drive system for construction machines |
December 15, 1998 |
| A hydraulic system for a construction machine includes a hydraulic pump driven by a prime mover, actuators driven by a hydraulic fluid delivered from the hydraulic pump, flow control valves for controlling flow of the hydraulic fluid to the actuators and operation means for operating the |
| 5839397 |
Engine cooling system and construction machine |
November 24, 1998 |
| First cooling air (50) enters an engine room (1) through a cooling air inlet port (7a) from the exterior of the engine room (1), and is throttled by a suction tube (8a) after passing heat exchangers such as an intercooler (6a), an oil cooler (6b) and a radiator (6c), followed by ente |
