Yanmar Co., Ltd.

Yanmar Holdings Co., Ltd.

Nagahiro Ogata

Kunihiko Sakamoto

Kiyoyuki Okuyama

Yoshihisa Ishikawa

Yousuke Yamashita

Satoshi Kitahara

Tsuyoshi Nakahara

Masaaki Yamashita

Makiko Tajima

Mitsuhiro Takahashi

Kouichi Takata

Kenji Miyakawa

Kohei Okazaki

Hiroaki Ayabe

Seiji Sakada

Masashi Danguchi

Riki Fujita

A work vehicle includes a monitoring device which monitors the surroundings of the work vehicle; an alarm device which outputs an alarm on the basis of a monitoring result of the monitoring device; a posture detection unit which detects whether an operator sits on an operation seat of the work vehicle and is in an operation posture for operating the work vehicle; and a control unit which controls the alarm device on the basis of the result of detection by the posture detection unit. Based on detection by the posture detection unit that the operator is in the operation posture, the control unit causes the alarm device to output an alarm based on the monitoring result of the monitoring device, and based on detection by the posture detection unit that the operation posture of the operator is released, the control unit causes the alarm device to stop outputting the alarm based on the monitoring result of the monitoring device.

Work vehicle

The power transmission apparatus may include a battery, a motor generator that is switchable between a driving state and a power generation state, at least a load, an inverter to switch the motor generator to any of the driving state and the power generation state, a charging state detecting means to detect a charged amount C of the battery, an absorbing horsepower detecting means to detect the absorbing horsepower Lp of the load, and a control device to switch the motor generator to any of the power generation state and the driving state by means of the inverter, based on the absorbing horsepower Lp detected by the absorbing horsepower detecting means and the charged amount C of the battery that is detected by the charging state detecting means.

Power transmission apparatus

Wheel loader

The working vehicle may include a working apparatus in which an attachment is attachably mounted, a flow rate limitation setting means to set the maximum flow rate of hydraulic oil, an engine revolution sensor, a cam plate angle sensor, a valve opening degree sensor to measure a present flow rate of the hydraulic oil, a switching valve to switch between a single acting type and a double acting type, a display, a main controller to connect the flow rate limitation setting means, the engine revolution sensor, the cam plate angle sensor, the valve opening degree sensor, the switching valve, and the display apparatus. The maximum flow rate and the present flow rate, which are set by the flow rate limitation setting means, may be simultaneously displayed on the display apparatus.

Working vehicle

The power transmission apparatus may include a control device to carry out idling stop control in such a manner that, when it is detected that an operating means is not operated for a predetermined time or more, an engine is stopped, and a clutch is disconnected, and the supply of the electric power from a battery to a motor generator is interrupted, and when it is detected that the operating means is operated afterwards, the engine is started by a cell motor, and the supply of the electric power from the battery to the motor generator is permitted, and the clutch is connected after the number of revolutions Ne of the engine reaches a predetermined value or more, and the supply of the electric power from the battery to the motor generator is interrupted.

Display monitor for construction equipment

A working vehicle, wherein flows of hydraulic oil delivered under pressure from two or more hydraulic pumps are joined together and the joined hydraulic oil can be taken out. A working vehicle is provided with two hydraulic pumps independent of each other and adapted to deliver hydraulic oil under pressure, a mode switching valve () capable of being switched to a flow joining position (K) at which flows of the hydraulic oil delivered under pressure by the two hydraulic pumps are joined together, PTO ports () out of which the hydraulic oil is taken, and a PTO switching valve () provided downstream of the mode switching valve () and switching flow of the hydraulic oil so that the oil can be delivered under pressure to the PTO ports ().

Hydraulic circuit for working machine

A selector valve operating mechanism is provided with operating pistons which are hydraulic pistons connected through an operation link to a spool of a PTO selector valve, an solenoid valve for hydraulically controlling reciprocation of the operating pistons, and a controller which is a control device for transmitting an operation signal to the solenoid valve. Control of operation of the solenoid valve moves the spool through the operating pistons and the operation link to switch the PTO selector valve.

Selector valve operating mechanism for working vehicle

Rigidity of a frame of a working vehicle is improved by a simple structure and production costs are reduced by reducing the number of parts of a working vehicle. Pipesare provided on both left and right sides at the center in the front-rear direction of a side frame, and each pipehas a rectangular cross-section and penetrates an intermediate partition in the front-rear direction from a mast sectionup to a transmission section. Tie-down holes are formed in a front face plateto which the front end of a frameis connected, and a plateconnected to a side frameis provided at the bottom surface of each mast sectionprotruding outward from the side frame. Tanks installed on the working vehicle are suspended from the plate bodies, and a lift arm installation boss provided at each mast sectionis supported at both ends. A U-shaped reinforcement memberconnects the upper surface of mast partition plate of a mast sectionand left and right bosses.

Frame structure for working vehicle

Production of a working vehicle frame consumes high costs because it requires high rigidity. A simple construction improves the rigidity of the frame and reduces costs required for the production. In a structure of a frame () for a working vehicle (), side sections of the frame () are constructed in a boat form, and, in a front view, the width of a lower section of the frame () is set smaller than that of the central section in the vertical direction of the frame (). Further, a mast plate () for supporting a front loader () and a front axle installation plate section () are integrated, and side frames () constructing the side section of the frame () and the mast plate () are jointed in a lateral T shape in a side view.

There is provided a piping structure of a front work machine which prevents an increase in total with of the front work machine caused by hydraulic piping extended from the main machine side, and enables the piping following a structure of the front work machine turning vertically, by which a burden on the hydraulic piping accompanying the turning of the front work machine can be reduced to improve the durability.

Growing community of inventors

Chikugo, Japan

Nagahiro Ogata