Kubota Corporation

Naoya Okamoto

Norita Tottori

Tsuyoshi Gono

Keiji Takahashi

Ryosuke Tanaka

Tatsuya Sakai

Hironobu Nogami

Daisuke Nakayama

Ryuji Kitagawa

Keita Ono

Shota Nakano

A work vehicle includes a diesel engine, a heater to heat a gas to be supplied to a combustion chamber of the diesel engine, and a controller to execute an afterglow routine to cause the heater to operate. The controller is configured or programmed to execute the afterglow routine in response to the diesel engine being started, an elapse of a predetermined stop time since an end of a previous execution of the afterglow routine, and the work vehicle being in a warming-up state.

Work vehicle

A work machine includes an engine, a hydraulic pump, a work apparatus driver to receive a pressurized fluid, a hydraulic circuit connecting the hydraulic pump with the work apparatus driver, a control valve in the hydraulic circuit, a relief valve connected to a first portion upstream of the control valve, a drain path connected to a second portion upstream of the first portion, an on-off valve to open and close the drain path, and a controller to control the on-off valve based on a state of the engine. The controller is configured or programmed to keep the on-off valve open after detecting an operation to start the engine until detecting a start of the engine and to close the on-off valve in response to detecting the start of the engine.

Work machine

A work vehicle includes an engine, a transmission to change a received rotational force to a rotational force at a gear ratio that corresponds to a desired vehicle speed and output the changed rotational force, a first operating tool to change the rotation speed of the engine and a deceleration rate of the transmission, a rotation speed controller to control the rotation speed of the engine based on an input provided to the first operating tool, and a second operating tool to receive a holding instruction to hold the rotation speed of the engine constant. In response to the holding instruction being inputted to the second operating tool, the rotation speed controller is configured or programmed to disable control of the rotation speed of the engine which control is based on the input provided to the first operating tool, and hold the rotation speed of the engine constant in accordance with the holding instruction.

Work vehicle, control method, and recording medium

A valve unit (V) has a valve housing () that includes a supply oil passage () configured to receive operating oil from a hydraulic pump, and a pressure adjustment valve (Va) configured to adjust the pressure of the supply oil passage (). The pressure adjustment valve (Va) includes a pressure adjustment valve body () configured to open and close the supply oil passage (), a compression coil spring () that keeps the pressure adjustment valve body () at a closed position when the pressure of the supply oil passage () is smaller than a set value and allows the pressure adjustment valve body () to open when the pressure of the supply oil passage () is not smaller than the set value, and a restriction member () configured to, when the pressure adjustment valve body () becomes open against the urging force of the spring () in response to a pressure of the operating oil, abut against the pressure adjustment valve body () to restrict movement of the pressure adjustment valve body ().

Valve unit

A work machine includes a transmission case () extending in the front-back direction of a machine body, a first hydraulic unit (V) provided on one of mutually opposite wall portions () of the transmission case (), a second hydraulic unit () provided on a second one of the wall portions (), and a supply passage () configured to supply operating oil from the first hydraulic unit (V) to the second hydraulic unit (). The first hydraulic unit (V) and the second hydraulic unit () are aligned to be overlapped with each other as viewed in a direction orthogonal to a case axis (X) extending along the front-back direction of the transmission case (). The supply passage () extends inside the transmission case () in a straight line orthogonal to the case axis (X).

Growing community of inventors

Sakai, Japan

Naoya Okamoto