Kabushiki Kaisha Komatsu Seisakusho

Komatsu Corporation

Kabushiki Kaisha Komatsu

Masao Fukuda

Masanori Ikari

Nobuo Matsuyama

Hiroaki Inoue

Yasuo Yamazaki

An apparatus, for controlling a plurality of hydraulic motors and a clutch for driving a drive shaft, can prevent a speed change shock and a load slip of a hydraulic motor as well as making a structure simple. The apparatus includes: a first volume variable hydraulic motor (,), connected to the drive shaft (,) through the clutch (,); a second volume variable hydraulic motor (,), which is always connected to the drive shaft (3); first tilt rotation control means (,), for controlling a tilt rotation amount (a discharge volume cc/rev) of the first hydraulic motor by receiving a drive side pressurized oil (Pac) of the first hydraulic motor; and a zero tilt rotation holding means (,A), for holding the tilt rotation amount of the first hydraulic motor at substantially zero in a state wherein the tilt rotation amount of the first hydraulic motor is controlled to be substantially zero.

Apparatus for controlling a plurality of hydraulic motors and a clutch

A hydraulic drive type working vehicle, with speedy responsiveness in an excavating operation, includes: a pouring changeover valve (10), which is switchable between (a) a pouring position, wherein pressurized oil of a travel hydraulic circuit (5) is poured into a working machine hydraulic circuit (8), and (b) a shutoff position, wherein the travel hydraulic circuit (5) and the working machine hydraulic circuit (8) are isolated from each other; a first changeover valve (16), which is switchable from its shutoff position to its communicating position when the oil pressure of the travel hydraulic circuit (5) exceeds a predetermined oil pressure; a pouring command switch (14); and a second changeover valve (17), which is connected in series with the first changeover valve (16) and which is switchable from its shutoff position to its communicating position upon receipt of a pouring command from the pouring command switch (14); and wherein the pouring changeover valve (10) is switchable to the pouring position when the oil pressure of the travel hydraulic circuit (5) exceeds the predetermined oil pressure and the pouring command is outputted.

Hydraulic drive type working vehicle

A loading/unloading vehicle having booms and a bucket carried thereon such as a shovel loader, a wheel loader or the like vehicle detects that a true bucket-to-ground angle coincides with a preset angle after the vehicle starts automatic turning movement of the bucket. When the coincidence is detected, the automatic turning movement of the bucket is interrupted. Thereafter, a differential value between the true bucket-to-ground angle and the preset angle is determined, if any and then the bucket angle is corrected so as to allow the differential value to be reduced to zero. Consequently, the bucket is held at the preset angle after the bucket stops, even though the booms continue to be turned.

Apparatus for maintaining attitude of bucket carried by

Automatic speed changing apparatus for wheel loader

Automatic speed changing apparatus for vehicle

Load weight measuring system mounted on a construction machine

Growing community of inventors

Kawagoe, Japan

Masao Fukuda