Hitachi Construction Machinery Co., Ltd.

Kcm Corporation

Kazuo Ishida

Noritaka Ito

Shoroku Kawahara

Kazuya Takeda

Satoru Kaneko

Hidekazu Moriki

Koji Hyodo

Yuichiro Morita

Shigeyuki Yoshihara

Noritaka Itou

Hirofumi Shimada

Atsushi Ninomiya

Takashi Ikimi

Isamu Aoki

Nobuhiro Suzuki

Tadashi Osaka

Katsumi Usami

Yusuke Daimon

Masaru Oda

Satoshi Sekino

Tadayoshi Aoki

Kazuo Chonan

Koji Takano

Masaki Higurashi

Genichiro Ishimaru

Toshio Kotaka

Toru Kikuchi

Tsuyoshi Takeyama

Yoshihiro Itou

Hiroki Gotou

Yoshihiko Nakazawa

Shota Kimura

Takehiko Katsuragi

A wheel loader with a front bucket is capable of preventing spillage of load materials from the bucket, even without adjusting an angle of the bucket where a traveling state is switched from a flat ground to an inclined ground. The wheel loader has a bucket provided on the front of a vehicle body to scoop and discharge a work material, an inclination sensor for detecting an inclination angle θ of the vehicle body, and a controller configured to, in the case where a height position of the bucket is higher than a predetermined height and it is determined that the vehicle body is in a state of being inclined rearward, activate a bucket cylinder for causing the bucket to correct an angle of the bucket toward a front side where the bucket dumps in accordance with the inclination angle of the vehicle body.

Work vehicle

Cabin for construction machine

A wheel loader includes a working device, a lift cylinderwhich is a hydraulic actuator that drives the working device, a hydraulic pumpthat supplies hydraulic oil to the lift cylinder, a lift cylinder bottom pressure detectorthat detects a pressure of the lift cylinder, a control valvethat controls the amount of hydraulic oil to be supplied from the hydraulic pumpto the lift cylinder, a vehicle acceleration detectorthat detects a vehicle acceleration in a longitudinal direction, and a control device. The control devicedetermines whether the working device has started excavation, or not, based on the lift cylinder bottom pressure detected by the lift cylinder bottom pressure detectorand the vehicle acceleration detected by the vehicle acceleration detector

The work vehicle includes: a clutch device including a forward-travel clutch and a backward-travel clutch configured to cause, when being in an engagement state, the work vehicle to travel in a forward travel direction and a backward travel direction; a forward-backward travel instruction device configured to instruct the work vehicle to travel in the forward travel direction or the backward travel direction; a clutch state detection device configured to detect whether the forward-travel clutch and the backward-travel clutch are each in the engagement state; and a torque restriction section configured to restrict a maximum absorbing torque of the hydraulic pump to be low when a restriction condition holds, the restriction condition including a condition that a traveling direction of the work vehicle, which corresponds to an engagement state of the clutch device, and a traveling direction of the work vehicle, which is instructed by the forward-backward travel instruction device are opposite to each other.

Wheel loader

In a work vehicle provided with: a working device including an arm and a bucket; a vehicle speed detection device that detects a vehicle speed; a travel drive device that outputs a travel driving force increasing in response to a decrease in the vehicle speed at a time of excavation; and a control device that controls the travel driving force by the travel drive device, the control device is characterized by including a limit control section that limits the travel driving force during a specified time which passes from when the vehicle speed detected by the vehicle speed detection device becomes a predetermined first vehicle speed threshold value or less and the work vehicle plunges into an object to be excavated until an operation of the working device is started.

A hybrid type work vehicle includes a power source, a traveling unit, a hydraulic work unit, an accelerator pedal, a brake pedal, an operation lever device, and a control apparatus. The control apparatus is configured such that when the current operation state is determined to be that of an excavation work which is a combined operation of the traveling unit and the hydraulic work unit and the output power limitation signal is outputted, the control apparatus limits the output power of the traveling unit. The control apparatus is also configured to decrease the tilting angle of the hydraulic pump, such that a ratio between the output power of the traveling unit and the output power of the hydraulic work unit is maintained at a preset ratio.

Hybrid type work vehicle

An electric driving wheel type work vehicle has a traveling motor, an inverter for supplying the motor with three-phase power converted from DC power, a pre-driver circuit for supplying a gate signal to the inverter on the basis of an input PWM signal, a controller for outputting to the pre-driver circuit the PWM signal for controlling the driving of the motor, a parking brake, and a parking brake condition detector that detects the condition of the parking brake. When it is detected that the parking brake has been operated, the pre-driver circuit cuts off the output of the gate signal or the input of the PWM signal to the pre-driver circuit.

Electric driving wheel type work vehicle

This invention includes a hydraulic pump (), a working implement () having a lift cylinder () driven by a hydraulic fluid supplied from the hydraulic pump (), an operating device () for operating the working implement (), a traveling motor () for driving wheels, and a main controller (). When the lift cylinder () fails to operate despite an extending instruction being imparted to the lift cylinder () via the operating device (), the main controller () reduces a limit value for an increase rate of a torque required in the traveling motor () to a value smaller than that applied when the lift cylinder () operates. With this configuration, occurrence of wheel slip during lifting of an object to be carried can be reduced.

Construction 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

A first motorand a second motorof variable displacement type are in parallel to each other connected to a hydraulic pumpin a closed circuit, through which the output torque from the first motoris transmitted to an output shaft. A clutch control unitcontrols a clutch deviceas: when the engine speed is N, which is the case where the accelerator pedal is fully depressed, the clutch is disengaged at the vehicle speed v. When the engine speed is N(&#x3c;N), which is the case where the accelerator pedal is half depressed, the clutch is disengaged at the vehicle speed v(&#x3c;v).

Clutch control device for hydraulically driven vehicle

Growing community of inventors

Ryugasaki, Japan

Kazuo Ishida