Hitachi Construction Machinery Co., Ltd.

Kcm Corporation

Tadayoshi Aoki

Koji Hyodo

Masaki Yoshikawa

Hirofumi Oouchi

Hiroki Nakazono

Akira Shimohira

Kazuhiko Hiraoka

Isamu Aoki

Ei Takahashi

Kazunori Komatsu

Kazuo Ishida

Atsushi Shimazu

Takashi Takeyama

Shoroku Kawahara

Katsutaka Hara

Hiroaki Yada

Tsuyoshi Takeyama

Takehiko Katsuragi

Yoshihiro Ito

A work machine includes: a vehicle body frame of the work machine; an engine mounted on the vehicle body frame; an engine cover covering over a top of the engine and fixed to the vehicle body frame via a column; a first exhausting device having a tubular appearance; a second exhausting device having a tubular appearance and having a function different from that of the first exhausting device; and a bracket holding the first exhausting device in an upper holding part and the second exhausting device in a lower holding part to attach them on a bottom surface of the engine cover. The bracket integrally holds the first and second exhausting devices in such a manner that an extending direction of the first exhausting device and an extending direction of the second exhausting device are generally parallel, seen from above, and a part of the first exhausting device and a part of the second exhausting device overlap each other, seen from above, while fixing the first and second exhausting devices below the engine cover.

Work machine

An engine speed control device for an industrial vehicle includes an approach detector that detects an approach of the industrial vehicle to an object to be approached; and an engine speed controller that restricts an upper limit of a rotation speed of an engine when the approach detector detects an approach of the industrial vehicle to an object to be approached.

Engine speed control device for industrial vehicle

A shift control system for an industrial vehicle includes: a vehicle speed detection device that detects a vehicle speed; a transmission device that shifts up and shifts down a speed stage of a transmission; a shift control device that permits shift up when a vehicle speed becomes equal to or greater than a shift up permission vehicle speed; a height position detection device that detects a height position of a working machine device; a forward/backward switch device that switches the industrial vehicle between forward travel and backward travel; and a shift up control switch selection device that switches between normal control, in which shift up is performed by the transmission device when the vehicle speed becomes equal to or greater than the shift up permission vehicle speed, and delay control, in which shift up timing is delayed with respect to the normal control.

Shift control system for industrial vehicle

A working vehicle motor control device includes: a rotational speed control device that controls a motor rotational speed in accordance with an operation amount of an accelerator pedal; a travel drive device that transmits rotation of the motor to wheels through a torque converter and a transmission; a speed ratio detection device that detects a speed ratio of an input shaft and an output shaft of the torque converter; and a speed restriction device that restricts a maximum rotational speed of the motor in accordance with a speed ratio detected by the speed ratio detection device. In the working vehicle motor control device, the speed restriction device restricts the maximum rotational speed when a detected speed ratio is in an acceleration region of the motor rotational speed to less than the maximum rotational speed when a detected speed ratio is in a non-acceleration region.

Motor control device for working vehicle

There are provided: an HST hydraulic circuit that is formed through a closed circuit connection of a variable displacement hydraulic pumpand first and second variable displacement hydraulic motorsand; a charge pumpthat replenishes the HST hydraulic circuit with hydraulic oil; a cooling circuit through which an excess of the hydraulic oil that has been replenished from the charge pumpto the HST hydraulic circuit is returned to a reservoir through the hydraulic pump, the first hydraulic motor, and the second hydraulic motor; a hydraulic sourcethat supplies hydraulic oil to an hydraulic device other than the first and second hydraulic motors; and a merge circuit through which a portion of hydraulic oil from the hydraulic sourceis merged into an intermediate oil linethat lies downstream of the first hydraulic motorand upstream of the second hydraulic motorin the cooling circuit.

HST cooling circuit

Wheel loader

Growing community of inventors

Ryugasaki, Japan

Tadayoshi Aoki