Komatsu Corporation

Shuuji Hori

Hiroyuki Chikugo

Daisuke Kozuka

Naoki Ishizaki

Akira Hasebe

Toshiyuki Matsumoto

Shinya Sano

Mitsumasa Akashi

Masayoshi Mototani

Shuki Akushichi

Nobumasa Takamatsu

Mutsumi Ono

Kota Imanishi

Haruna Higashi

Toshihiko Nishiyama

Takahisa Iino

Yasuhiro Sato

Masato Kageyama

Hisashi Asada

Shinobu Nagura

Yuta Baba

Tomohisa Kaneda

Masayuki Tajima

Takuya Nohara

Yasuhiro Satou

Sadao Nunotani

Tadashi Iijima

Norihide Mizoguchi

Nobuhisa Honda

Kazunori Ikei

Yasukuni Kawashima

Hideyuki Seiyama

Yuuichi Yamamoto

Mitsuru Ohshiro

Taisei Okubo

Takeshi Endo

Daigoh Fujii

Junichi Fukushima

Koichi Miyake

Naoya Sodeyama

Kiyotaka Saitou

Jun Nabata

Takeaki Unno

Mikio Nojiri

Shunsuke Koike

Takehide Kitagawa

A detection device includes a photographing unit, a first holding portion holding the photographing unit, a magnet having an attracting face facing a flow space in which fluid flows and opposed to the photographing unit via the flow space, a second holding portion holding the magnet, and a connection portion connected to the second holding portion and having an opening portion.

Detection device, mechanical device, and work vehicle

A machine device state monitoring system includes an image data acquisition unit that acquires image data of an inside of a housing chamber in which a mechanical part is housed, an image analysis unit that outputs foreign substance data relating to a foreign substance in oil in the housing chamber based on the image data, a storage unit that stores characteristic data indicating a characteristic of the foreign substance, and an estimation unit that estimates a state of a machine device having the mechanical part based on the foreign substance data and the characteristic data to output estimation data.

Machine device state monitoring system and machine device state monitoring method

A hydraulic oil monitoring system includes an image-data acquiring unit that acquires image data of the oil surface of hydraulic oil stored in a hydraulic oil tank of a work vehicle and an image analyzing unit that outputs, based on the image data, air bubble data relating to air bubbles included in the hydraulic oil.

Hydraulic oil monitoring system and hydraulic oil monitoring method

A variable displacement hydraulic pump or motor includes: a swash plate; a lever supported by a housing and configured to rotate in conjunction of tilting of the swash plate; and a sensor configured to detect a displacement amount of the lever.

Hydraulic pump and motor

An oil state detection device includes an index member, a lighting device that illuminates the index member, and a photographing device that photographs the index member through oil in a machine device.

Oil state detection device, work machine, management system, and oil state detection method

A mechanical device includes a housing, a transparent spacer member, a magnet, and an image capturing device. The housing has an internal space in which a machine component immersed in oil is housed. The spacer member is disposed in an opening of the housing. The magnet is supported by the spacer member. The image capturing device captures the internal space of the housing via the spacer member.

Mechanical device, working vehicle, and deterioration state estimation system and deterioration state estimation method of machine component

A hydraulic cylinder spool valve device, which extends and retracts a cylinder rod of a hydraulic cylinder, includes: a first spool valve having a first dead band and a first opening characteristic; a second spool valve having a second dead band and a second opening characteristic; and a controller performing communication with the hydraulic cylinder by using the first spool valve and positioning the second spool of the second spool valve within the second dead band and performing communication with the hydraulic cylinder by using the second spool valve and positioning the first spool of the first spool valve within the first dead band, and adjusting a characteristic of a switching dead band between the first opening characteristic and the second opening characteristic.

Hydraulic cylinder spool valve device

In order to be able to easily check the state of foreign matter contained in oil regardless of an installation location, a device main bodyhaving a housing chamberin which oil is stored, a plugattached to a bottom portion of the housing chamberin a state where an end surface of a shaft portionfaces upward, a spacer memberformed by a transparent member and arranged on the plugin such a manner that one end surfacefaces an inside of the housing chamber; and an imaging unitarranged on the plug, the imaging unitimaging the inside of the housing chambervia the spacer memberare provided.

Mechanical device

A strainer device includes a strainer element; a first lid member that covers an upper opening of the strainer element; a second lid member that covers a lower opening of the strainer element and has a fitting hole in a portion surrounded by the strainer element; a delivery pipe protruding upward inside a hydraulic oil tank in a state in which the delivery pipe is fitted into the fitting hole of the second lid member; and a check valve arranged at the first lid member. The check valve includes a valve main body having a valve passage whose one end opens to the internal space of the strainer element and whose other end opens to inside of the hydraulic oil tank; and a valve body which is arranged to be able to move in a vertical direction with respect to a valve seat provided in the valve passage.

Strainer device

A stroke detection device for detecting, along a longitudinal direction, a stroke amount of a spool arranged in a valve main body. The stroke detection device includes: a device main body attached to the valve main body; a detection rod extending along the longitudinal direction of the spool, and movably arranged along the longitudinal direction inside the device main body, in a position where a tip end portion faces an end surface of the spool; a stroke detection unit configured to output a detection signal according to the stroke amount of the detection rod with respect to the device main body; and an attracting unit arranged in the tip end portion of the detection rod, the attracting unit being attracted to the end surface of the spool by magnetic force.

Stroke detection device

A blocking configuration of an oil pressure circuit hole includes a plug screwed together with an aperture end portion of the oil pressure circuit hole provided to a main body. The plug includes: a shaft portion; an external thread portion disposed on a leading end of the shaft portion; an O-ring mounted on an outer periphery of a base end portion of the shaft portion and pressed between the outer periphery of the shaft portion and an inner periphery of the oil pressure circuit hole to seal them; a flange portion having an external diameter larger than that of the shaft portion and disposed on a part of a base end side of a storage groove on which the O-ring is mounted; and a polygonal column-shaped head portion on which a tightening tool is mounted and disposed on a part of a base end side of the flange portion.

Blocking configuration of oil pressure circuit hole

A steering device for a wheel loader includes a handle for steering, a lever for steering, a steering cylinder, a steering valve that controls a direction of operating fluid to the steering cylinder, and a pump that supplies operating fluid to the steering cylinder via the steering valve. The steering device further includes a handle control valve that controls the supply direction of the operating fluid according the handle, a lever electromagnetic control valve that controls the supply direction of operating fluid according to the lever, and a handle prioritization valve that shuts off a pilot hydraulic pressure supplied from the lever electromagnetic control valve to the steering valve according to a pressure produced by operating fluid flowing through the handle control valve when the handle is operated. The handle prioritization valve includes a switching valve and a priority control valve switchable between a handle stage and a lever stage.

Steering device for wheel loader

A steering device for a wheel loader includes a handle for steering, a lever for steering, a steering cylinder, a steering valve that controls a direction of operating fluid to the steering cylinder, and a pump that supplies operating fluid to the steering cylinder via the steering valve. The steering device further includes a handle control valve that controls the supply direction of the operating fluid according the handle, a lever electromagnetic control valve that controls the supply direction of operating fluid according to the lever, and a handle prioritization valve that shuts off a pilot hydraulic pressure supplied from the lever electromagnetic control valve to the steering valve according to a pressure produced by operating fluid flowing through the handle control valve when the handle is operated. Communication between the lever electromagnetic control valve and the steering valve is allowed when only the lever electromagnetic control valve is operated.

A steering device for a wheel loader includes a handle for steering, a lever for steering, a steering cylinder, a steering valve that controls a direction of operating fluid to the steering cylinder, a pump that supplies operating fluid to the steering cylinder via the steering valve, and a return oil passage connected to a tank. The steering device further includes a handle control valve that controls the supply direction of the operating fluid according the handle, a lever electromagnetic control valve that controls the supply direction of operating fluid according to the lever, and a handle prioritization valve that shuts off a pilot hydraulic pressure supplied from the lever electromagnetic control valve to the steering valve according to a pressure produced by operating fluid flowing through the handle control valve when the handle is operated. The handle prioritization valve includes a throttle arranged in the return oil passage.

A steering device for a wheel loader includes a rotatable handle, a tiltable lever, a steering cylinder, a steering valve, a pump, a handle control valve, a lever control valve, and a handle prioritization valve. The steering valve controls a supply direction of operating fluid to the steering cylinder with pilot hydraulic pressure. The pump supplies operating fluid to the steering cylinder via the steering valve. The handle and lever control valves supply pilot hydraulic pressure to control the supply direction to the steering valve according to handle rotation and lever tilt, respectively. The handle prioritization valve shuts off the pilot hydraulic pressure supplied from the lever control valve to the steering valve according to a differential pressure or an absolute pressure in a hydraulic circuit produced due to operating fluid flowing through the handle control valve when the handle is operated.

Growing community of inventors

Oyama, Japan

Shuuji Hori