Kubota Corporation

Toshimitsu Yazaki

Akihiro Matsuzaki

Atsushi Hayashi

Kenichi Iwami

Shigeki Hayashi

Nobuyuki Okabe

Kenichiro Tsuji

Toshinobu Owada

Kazuma Ishihara

Shinnosuke Ishikawa

Tomeo Umemoto

Shigeo Sakamoto

Koichi Hasegawa

Koichiro Kan

Hideo Fujita

Tetsuya Yamamoto

Toshiya Tsuji

A working machine includes a vehicle body, a travel apparatus provided to a rear portion of the vehicle body, a fender provided above the travel apparatus, and hydraulic piping that is disposed between the travel apparatus and the fender and that extends from a front-portion side to a rear-portion side of the fender.

Working machine

A suspension system for a traveling vehicle body is disclosed. The system includes a suspension reference position varying mechanism () for varying a reference position of a suspension stroke of the suspension mechanism (), and a controller () configured to calculate an intermediate value from a maximal value corresponding to the maximal position of the suspension stroke and a minimal value corresponding to the minimal position of the suspension stroke, and to control the suspension reference position varying mechanism such that, when the calculated intermediate values deviates from a set target range, the intermediate value is displaced toward the target range. The controller () increases a control execution frequency for the suspension reference position varying mechanism () when the traveling speed of the vehicle body is low, and reduces the control execution frequency for the suspension reference position varying mechanism () when the traveling speed of the vehicle body is high.

Suspension system

The hydraulic suspension system comprises a suspension mechanism for a traveling vehicle body, a suspension reference position variation mechanism for varying a reference position of a suspension stroke of the suspension mechanism, and a stopped state detector for detecting a state in which operation of the suspension mechanism has stopped. The control management unit controls the suspension reference position variation mechanism so that when operation of the suspension mechanism is detected by the stopped state detector to be in a stopped state, the operation of the suspension mechanism moves toward a target range, in preference to control based on a suspension stroke position obtained from a suspension stroke position sensor.

Hydraulic suspension system for work vehicle

The hydraulic suspension system comprises a suspension mechanism () for a traveling vehicle body, a suspension reference position variation mechanism () for varying a reference position of a suspension stroke of the suspension mechanism, and a stopped state detector () for detecting a state in which operation of the suspension mechanism () has stopped. The control management unit () controls the suspension reference position variation mechanism () so that when operation of the suspension mechanism () is detected by the stopped state detector () to be in a stopped state, the operation of the suspension mechanism () moves toward a target range, in preference to control based on a suspension stroke position obtained from a suspension stroke position sensor ().

A tractor is provided for suppressing pitching in which a front part of a traveling vehicle body is lifted upward, while a suspension mechanism functions when work is carried out with a ground implement. When a raise control signal for raising the plow is detected in draft control for elevating/lowering the plow based on a draw load value detected by a draw load sensor, mode switching means suppresses or limits the suspension function, via control of the suspension control means to suppress an event in which the front part of the traveling vehicle body is lifted upward. When the raise control signal is not detected, the mode switching means causes the suspension mechanism to function via control of the suspension control means.

Tractor

A suspension system for a vehicle includes a swing frame and right and left suspension cylinders for front wheels. The swing frame is swingably supported by the front portion of a vehicle body about a support shaft extending in a lateral direction, and supports the front axle case, so as to allow the front axle case to swing about a center shaft extending in a front-rear direction. The right and left suspension cylinders are provided on the swing frame. A lateral oscillation regulation unit is provided between the swing frame and the front frame, and configured to regulate an oscillation of the swing frame by contact in the lateral direction.

Suspension system for vehicle

A hydraulic suspension system includes a suspension base () supporting wheels, a hydraulic cylinder () for displaceably suspending the suspension base from a vehicle body, and an oil passage connected to the hydraulic cylinder. An accumulator () is incorporated within the oil passage. A flow control valve () is incorporated at an oil passage portion between the hydraulic cylinder and said accumulator for controlling an amount of work oil flowing therebetween. A pressure sensor () is provided for detecting a cylinder oil passage pressure effective on the hydraulic cylinder. A control unit () is provided for controlling operation of the flow control valve, based upon a detection value from the pressure sensor.

Hydraulic suspension system

A transmission for a tractor comprises a transmission case having an opening that opens to exterior of the transmission case and a speed change device that is housed in the transmission case. The transmission also includes a cover removably attached to the transmission case for closing the opening of the transmission, a main speed change shift fork supported by the cover and capable of engaging with and moving a main speed change shifter, and a sub speed change shift fork supported by the cover and capable of engaging with and moving a sub speed change shifter. The cover is capable of mounting a creep speed change device having a creep speed position.

Transmission for tractor

A working vehicle with a cab is disclosed. The working vehicle comprises a vehicle body for supporting said cab; ground-engaging means for supporting said vehicle body; and a cab frame provided to said cab, said cab frame including right and left front posts, right and left rear posts, and right and left upper frames extending fore and aft between upper end regions of said front posts and upper end regions of said rear posts, respectively; wherein at least part of said cab is curved to bulge outward.

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Sakai, Japan

Toshimitsu Yazaki