Kobe Steel, Ltd.

Kobelco Construction Machinery Co., Ltd.

Kobelco Cranes Co., Ltd.

The University of Tokyo

Kabushiki Kaisha Kobe Seiko Sho

Akira Tsutsui

Hiroaki Kawai

Koichi Shimomura

Seiji Saiki

Masayuki Komiyama

Naoki Sugano

Kenichi Inoue

Masayuki Kagoshima

Satoshi Maekawa

Yoshihiro Suda

Kazushige Koiwai

Takahiro Kobayashi

Etsujiro Imanishi

Kyoji Zaitsu

Takao Nanjo

Koichi Honke

Sho Fujiwara

Akira Nakazumi

Toshihiro Nogi

A hydraulic drive apparatus includes a boom flow rate control valve, a target boom cylinder speed calculation part, a pressing force calculation part, a correction part, and a boom flow rate operation part. The target boom cylinder speed calculation part calculates a target boom cylinder speed for making the construction surface by the bucket closer to the target construction surface. The pressing force calculation part calculates the pressing force by which the bucket is pressed against the construction surface, based on the cylinder thrust of the boom cylinder and the center-of-gravity position information on the center-of-gravity position of the work device. The correction part corrects the target boom cylinder speed to make the deviation between the target pressing force and the calculated pressing force closer to 0. The boom flow rate operation part operates the boom flow rate control valve to provide the corrected target boom cylinder speed.

Hydraulic drive device for excavation work machines

This DC brushless motor () is provided with a stator () that has exciting coils () and a rotor () that is positioned coaxially to the stator (). The stator () has a quasi-E-shaped cross-section in the axial direction at the radius part; a plurality of protrusions () serving as magnetic poles are formed on the respective 3 parallel sections () of the E in the same number in the circumferential direction; and of the magnetic poles () formed at the 3 parallel sections () of the E, the top and the bottom magnetic poles () are respectively positioned so as to be shifted in the opposite directions in the circumferential direction with respect to the center line of the middle magnetic pole (). Changes in the magnetic resistance between the stator () and the rotor (), which are caused by the flow of a magnetic flux generated around the exciting coils (), are utilized as a driving force. The DC brushless motor () configured in said manner exhibits excellent space efficiency at low cost and is less affected by temperature changes.

DC brushless motor and method for controlling the same

Provided is a motor including a rotor, a stator having a stator core and a coil, a stator frame, an end cover, first and second bearings, and a heat radiating resin in the stator frame. The coil includes first and second end portions projecting oppositely and axially. The stator frame includes a peripheral wall and an end wall, whose respective central parts form first and second boss portions holding the first and second bearings respectively. The heat radiating resin includes a first resin part covering the first end portion and closely contacting an inner surface of the stator frame, and a second resin part covering the second end portion and separating from an outer peripheral surface of the second boss portion. The first resin part has a portion between the first end portion and the first boss portion, the portion having a greater thickness than that of the other.

Motor including heat radiating resin

A slewing stop control apparatus and method, capable of executing, while performing the control of determining the target slewing velocity based on a remaining slewing angle from the actual slewing motion position up to the slewing stop angular position, an automatic control of re-slewing the slewing structure having been stopped before the slewing stop angular position. The apparatus executes slewing angular velocity control for deciding the slewing braking start timing to stop the stewing structure at a slewing stop angular position in accordance with a predetermined slewing deceleration and the subsequent target slewing angular velocity, based on the remaining slewing angle of the slewing structure. When the slewing structure stops before the slewing stop angular position due to disturbance despite the foregoing control, the target slewing angular velocity is corrected to be increased for generating slewing torque to restart the slewing.

Slewing stop control apparatus and method for slewing type working machine

Provided is a braking control apparatus for a slewing type working machine capable of giving a braking operation easily intuitively grasped. This apparatus includes: a flow control valve actuator increasing an opening of a flow control valve between a slewing hydraulic motor and a hydraulic pump according to an operation amount of a slewing operation member; pressure control valves limiting respective maximums of an inlet and outlet pressures of the hydraulic motor to a set value corresponding to a pressure command signal to be input; a motor-side pressure controller which retains a set pressure of the motor inlet sided pressure control valve to a pressure for motor driving and lets a set pressure of the motor outlet side pressure control valve be a set pressure for a braking torque corresponding to an operation amount of a braking operation member other than the slewing operation member; and a valve opening limiter reducing the opening of the flow control valve in correspondence with the operation of the braking operation member.

Braking control apparatus for slewing type working machine

An excavator has a controller capable of setting target torque of a rotation motor in accordance with a speed deviation between target speed set in accordance with an operation amount of an operating lever and actual rotation speed and is provided with an inverter for detecting necessary torque for rotating an upper rotating body, the necessary torque being changed in accordance with a working state of the upper rotating body. The controller calculates a correction amount which is increased as increasing the torque and subtracts the correction amount from the target speed so as to set new target speed. A controller sets first target torque for driving the motor and second target torque for maintaining the upper rotating body on the spot on the basis of the actual speed, and operates the motor in accordance with the torque which has a larger absolute value in the same direction as the first target torque among both the torque.

Rotation control device and working machine therewith

A tire HIL simulator is provided which is capable of, in a testing apparatus where a vehicle model is incorporated into a tire testing apparatus, reproducing the behavior of a tire which corresponds to the three-dimensional behavior of a vehicle, even if a three-dimensional vehicle model is used. As a device for resolving this, this tire HIL simulator includes a tire testing apparatusand a controllerconnected mutually. The tire testing apparatusconducts a running test on a tireusing a mimic road surface body, and includes a side force measuring devicefor measuring a tire side force and each actuator which gives a contact load, a side-slip angle and a camber angle, respectively. The controllersets a steering angle and a tire side force from the side force measuring deviceas an input value and calculates the three-dimensional motion of a vehicle using a vehicle model, and based on this calculation result, outputs each command value for the contact load, the side-slip angle and the camber angle to each actuator of the tire testing apparatus

Tire HIL simulator

Growing community of inventors

Kobe, Japan

Akira Tsutsui