Kubota Corporation

Nobuyuki Okabe

Eiji Nishi

Kenji Yoshikawa

Akihiro Matsuzaki

Atsushi Hayashi

Toshimitsu Yazaki

Shigeki Hayashi

Kenichi Iwami

Shinnosuke Ishikawa

Yusuke Suzuki

Tetsuya Kosaka

Katsuhiko Honda

Yoshinobu Odawara

Kenichiro Yagi

Toshiya Fukumoto

Tomiho Tanaka

Yuji Tomiyama

Shinya Ukai

Kiyokazu Fujibayashi

Jun Matsui

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

A display system for a work vehicle is disclosed including a display device () having an information display area (), a display control unit () for controlling the display device, and a display switching command device (A) which outputs a display switching command for switching a display in the display device. The display control unit () selects and sets, based on an output from the display switching command device (A), one or more of an operating time display mode for displaying an operating time of an engine, an instantaneous fuel consumption display mode for displaying an instantaneous fuel consumption, an average fuel consumption display mode for displaying an average fuel consumption, and an amount of used fuel display mode for displaying an amount of used fuel, as a display mode for the information display area ().

Display system for work vehicle having a display switching command device for switching a display in a display device

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 ().

An engine has an exhaust gas treatment apparatus attached thereto, wherein an exhaust pipe can be prevented from being damaged by a vibration of the engine body. An exhaust gas treatment apparatus is supported by an engine body and the engine body and the exhaust gas treatment apparatus communicate with each other through an exhaust pipe. The casing of the exhaust gas treatment apparatus consists of a plurality of casing units separable from each other. Connection flanges are disposed in respective end portions of the casing units. The casing units are coupled together by a connection of the connection flanges, and the exhaust gas treatment apparatus is supported by the engine body through the connection flanges.

Engine with exhaust gas treatment apparatus

Provided is a tractor which allows continuation of a plowing work by appropriately elevating a plow when slip occurs in wheels. The tractor includes draft controlling means () for elevating the plow to a target machine body level value obtained by making reference to control information with a draft load value detected by a draft load sensor (S). The control information is set based on a target plowing depth set when the plow was set to a target plowing depth and a draft load value. When a slip ratio detected by a slip ratio acquiring means () exceeds a threshold value, in place of previously set control information, there is newly set control information which renders higher the target machine body level relative to a same draft load value, thereby to elevate the plow.

Tractor

An exhaust device for a work vehicle including: an exhaust pipe for guiding exhaust to a vehicle exterior. The exhaust pipe includes: an exhaust guide pipe into which exhaust from an engine is introduced, a bending section for changing an exhaust direction; an external protective pipe that externally fits onto a downstream-side guide pipe; an ejector section for suctioning and introducing external air between an outer periphery of the exhaust guide pipe and an inner periphery of the external protective pipe; and an external air introduction section provided to an upstream-side end section of the external protective pipe.

Exhaust device for work vehicle

An object of the present invention is to provide an engine having an exhaust gas treatment apparatus attached thereto, wherein an exhaust pipecan be prevented from being damaged by a vibration of the engine body. To achieve the object, in the engine having the exhaust gas treatment apparatus attached thereto in which an exhaust gas treatment apparatusis supported by an engine bodyand the engine bodyand the exhaust gas treatment apparatuscommunicate with each other through an exhaust pipe, the casing of the exhaust gas treatment apparatus consists of a plurality of casing units, andseparable from each other, connection flanges, andare disposed in respective end portions of the casing units, and, the casing units, andare coupled together by a connection of the connection flanges, and, and the exhaust gas treatment apparatusis supported by the engine bodythrough the connection flanges, and

An engine speed control system for a work vehicle is disclosed. Storage means () stores a predetermined engine speed. A manually operated input device () issues an instruction to retrieve the engine speed from the storage means (). Engine speed control means () executes a constant speed control, whereby the engine speed stored in the storage means () is set as a target speed on the basis of a first input operation made using the input device (). The engine speed control means () further executes a stored speed change control for allowing the setting of the engine speed stored in the storage means () to be changed based on a second, different input operation performed using the input device ().

Engine speed control system for work vehicle

An engine speed control system for a work vehicle comprises a pedal sensor () for detecting an operative position of an accelerator pedal (); a foot accelerator controller for carrying out foot accelerator control in which the engine speed that corresponds to an output of the pedal sensor () is used as a target rotational speed; and upper limit setting device () for setting the upper limit of the engine speed. The upper limit rotation control in which the upper limit rotational speed is used as the target rotational speed is carried out when the target engine speed is greater than the upper limit rotational speed set by the upper limit setting device ().

An engine controller () includes a first mode control module () for performing a first mode control in which a fuel injection amount in an engine () is obtained based on a first torque-engine rotational speed characteristic, and a second mode control module () for performing a second mode control in which the fuel injection amount is obtained based on a second torque-engine rotational speed characteristic. The first mode control module () has a first engine load estimation part () for estimating an engine load based on a difference in rotational speed between a non-load engine rotational speed and an actual engine rotational speed, and the second mode control module () has a second engine load estimation part () for estimating an engine load based on the fuel injection amount.

Engine controller for work vehicle

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

The engine speed control system for a work vehicle has a foot accelerator controller for carrying out foot accelerator control based on a pedal sensor, a hand accelerator controller for carrying out hand accelerator control based on a lever sensor, a manually operated input device, storage means for storing a predetermined engine speed, and a constant rotation controller for carrying out constant rotation control in which the engine speed stored in the storage means is used as the target rotational speed on the basis of an input to the input device. The constant rotation control is carried out when the input device has been operated in the case that the engine speed that corresponds to the output of the lever sensor is greater than an idling speed, and the constant rotation control is terminated when the input device is operated in the case that the engine speed that corresponds to the output of the lever sensor is equal to or less than the idling speed.

A work vehicle with a speed change device, comprises, a plurality of wheels including at least one driven wheel; an engine for driving the driven wheel; a speed change device provided between the driven wheel and the engine; and automatic shifting mechanism. The automatic shifting mechanism is capable of operating the speed change device to a lower speed position within an automatic shifting range having a predetermined range and is capable of operating the speed change device up to a speed position which the speed change device was in before an operation to the lower speed position was effected, in response to load on the engine. The entirety of the automatic shifting range is changeable to a low speed side and to a high speed side, or the automatic shifting range can be widened to include more speed positions and narrowed to include less speed positions.

Growing community of inventors

Izumi, Japan

Nobuyuki Okabe