Komatsu Corporation

Komatsu Utility Co., Ltd.

Shotaro Ishii

Noboru Kanayama

Akiko Konishi

Kouji Chikaishi

Kazuhiro Yoshida

Tatsuro Nohara

Jun Koizumi

Satoshi Asami

Takahisa Oasa

Akira Fukushima

Katsumi Yokoo

Ai Haginiwa

Masahiro Minato

Katsumi c/o Komatsu Utility Co Ltd Yokoo

A work vehicle includes a drive source, a travel device, a hydraulic pump, a work implement, a traction force detector, a lift force detector and a controller. The traction force detector is configured to detect traction force of the work vehicle. The lift force detector is configured to detect lift force for raising the work implement. The controller is configured to compare a predetermined threshold and a ratio between the lift force and the traction force, and to execute traction force reduction control for reducing the traction force when an increase in the lift force is required.

Work vehicle and work vehicle control method

A work vehicle includes a controller. The controller is configured to determine whether low-load conditions indicating that the work vehicle is in a low-load state are satisfied. The controller is configured to control an engine so that an upper limit value of an output torque of the engine when the low-load conditions are satisfied is made less than when the low-load conditions are not satisfied. Also, the controller is configured to vary a reduction amount of the upper limit value of the output torque of the engine when the low-load conditions are satisfied, in accordance with variation in at least one of vehicle speed, vehicle acceleration, and engine-rotation-speed acceleration, and in accordance with variation in engine rotation speed.

In an engine load control device of a work vehicle, an output of an engine is transmitted to a hydraulic actuator via a variable displacement type hydraulic pump. A controller is configured to calculate, based on a target rotational speed of the engine detected by a target rotational speed detecting portion and an actual rotational speed of the engine detected by an actual rotational speed detecting portion, a variation rate per unit time of a difference between the detected results, and to adjust the maximum absorbing torque of the hydraulic pump according to the magnitude of the variation rate.

Engine load control device of work vehicle

A fluid tank includes a tank main body that contains a fluid and a bubble removing device that is provided inside the main body and removes bubbles in the fluid. The main body includes a partition and a delivery port through which the fluid is fed to outside. The bubble removing device has an outflow port through which the fluid from which the bubbles have been removed flows to the inside of the main body and a bubble exhaust port through which the bubbles which have been removed are discharged to the inside of the main body. The delivery port is provided adjacent to the outflow port relative to the partition. The partition partitions the inside of the main body into a side in which the outflow port and the delivery port are provided and a side of the bubble exhaust port.

Liquid tank

A hydraulic excavator is equipped with one or more downsizing scheme including at least one of: (i) a bubble removing device for removing bubbles in hydraulic fluid, (ii) a hydraulic tank including a main tank and a variable capacity tank arranged separately from each other, and (iii) a variable capacity tank or hydraulic tank which is fitted to the rear surface of the upper cover of the seat-side block. Thus, the lateral section of the seat can be ultimately downsized to provide a large space around the seat. Then, unlike the prior art, a canopy or a cab of a larger hydraulic excavator can be securely arranged on the upper swing body of a small hydraulic excavator. Since such large parts can be commonly used with large hydraulic excavators, it is possible to significantly reduce the cost of the hydraulic excavator.

Service vehicle

Service vehicle with a walk-through to the outside

A fluid tank fluid is provided which includes a bubble removing device provided therein to remove bubbles from the fluid. The bubble removing device includes a cyclone chamber for generating a swirling current in the fluid flowing therethrough to separate bubbles from the fluid. At least one outflow port is provided through which the fluid from which the bubbles have been separated flows from the cyclone chamber. And an exhaust port is provided through which the bubbles separated from the fluid are driven from the cyclone chamber.

Growing community of inventors

Sagamihara, Japan

Shotaro Ishii