Yanmar Co., Ltd.

Yanmar Agricultural Equipment Co., Ltd.

Serei Industry Co., Ltd.

Shigemi Hidaka

Shinya Kawashiri

Takeshi Ouchida

Shuji Shiozaki

Shingo Eguchi

Daigo Yokoyama

Takeshi Kishimoto

Toshihiko Ibe

Youichirou Nishi

Takafumi Yamada

Outer rear end surfaces of a pair of front frames are connected to corresponding inner front end surfaces of a pair of main frames with spacers being interposed therebetween. Accordingly, a width between the front frames is independent of a width between the main frames, so that maximum steerable angles of front wheels can be increased as much as possible without increasing a mounting pitch of the front wheels. The front frames can be arranged such that at least upper regions of the rear end surfaces thereof are located forward of the mount flange, and the engine unit and the flywheel unit are supported by the vehicle frames such that at least lower portions thereof overlap the vehicle frames in a side view, and the mount flange overlap the upper regions of the rear end surfaces of the front frames in a front view.

Work vehicle comprising vehicle frames

Tractor

A control apparatus for a tractor or wheel loader includes a speed change sensor that detects the step-on amount of a speed change pedal, an actuator that regulates a swash plate angle of a hydraulic pump based on the detection value of the speed change sensor, a transmission output unit rotation sensor that detects the revolution speed of an output shalt, and a control unit. When the speed change pedal is not stepped on, a braking force is applied to travel wheels and both of a forward drive clutch and a reverse drive clutch are disengaged. When a transmission drive output detected with the transmission output unit rotation sensor is not more than a fixed forward or reverse drive switching speed, either the forward drive clutch or the reverse drive clutch is engaged as the speed change pedal is stepped on.

Controller of work vehicle

There is provided a working vehicle 1including the right and left vehicle frames reinforced by an upper connecting member and a lower connecting member near the engine, thereby eliminating the conventional need for e.g. highly rigid cylindrical members in constructing the right and left vehicle frames. An engine frame for mounting an engine are connected with a pair of right and left vehicle frames, and a transmission case is placed between rear portions of the right and left vehicle frames. The right and the left vehicle frames are connected via an upper connecting member and a lower connecting member. The engine has an output portion provided with a flywheel, which has its outer circumference surrounded by the right and the left vehicle frames and the upper and the lower connecting members.

Working vehicle

A travel working machine includes a traveling bodysupported by traveling contrivances such as wheelsand provided with an enginea transmission casemounted to the traveling body, and a hydraulic mechanical transmission mounted to the transmission case for changing speed of power from the engine by a combination of a planetary gearingand a hydraulic transmission which includes a hydraulic pumpand a hydraulic motorand transmitting the power to the traveling contrivances. A pump input shaftfor input to the hydraulic pump, a motor output shaftfor output from the motor and transmission gearsprovided at the respective shafts are arranged in the transmission case and above an oil level S of lubricating oil stored in a lower portion of the transmission case. Such an arrangement contributes to reducing power loss.

Travel working machine

A working vehicle such as a mobile agricultural machine is designed such that it has an improved working efficiency if any spinning turn is not required, and has an improved running property in a wet farm. The vehicle has a pair of right and left crawlers (), a speed change apparatus () for imparting traction force to the crawlers, a speed change lever () operable to control the speed change apparatus so as to alter running speed of the vehicle in a step-less manner. The vehicle further has a steering apparatus () and a steering wheel () operable to control the steering apparatus so as to alter difference in the running speeds between the crawlers (). The running speed generally determined for each crawler by the speed change lever () can be decreased voluntarily and proportionally to an operated angle of the steering wheel ().

Work vehicle

A mobile cultural machine including right and left traction members, a transmission, and a main speed change device operable to transmit, at any speed ratio, a driving force from an engine through the transmission to the traction members so that they are driven at any traveling speed. A steerage and a steering devise operate cause the steerage to differentiate the traveling speeds between traction members. The traveling speeds are reduced in response to the extent to which the steering device is operated, so that a machine running straight may smoothly be controlled to enter a spinning turn at the end of a row.

Mobile agricultural machine

In an operation mechanism of an HST system transmission apparatus of the type in which an HST system non-stage transmission mechanism for driving and an HST system non-stage transmission mechanism for turning are disposed, the HST system non-stage transmission mechanism is operated by a transmission lever and the HST system non-stage transmission mechanism for turning is operated by a round operation wheel, a steering mechanism can make a turning operation matching turn feeling desired by an operator in turning at both low and high speeds. Namely, in the operation of the HST system transmission apparatus wherein the HST system non-stage transmission mechanism (,) for driving is operated by a transmission lever (,) and the HST system non-stage transmission mechanism (,) for turning is operated by a round operation wheel (,), a speed ratio between right and let driving devices is changed in accordance with the operation turning angle of the round operation wheel (,). The turning radius is changed, even with the same operation turning angle of the round operation wheel (,), by the difference of the operation angle of the transmission lever (,).

Growing community of inventors

Osaka, Japan

Shigemi Hidaka