Patents by Inventor Hiroyuki Chikugo
Hiroyuki Chikugo has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9309646Abstract: 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.Type: GrantFiled: June 1, 2015Date of Patent: April 12, 2016Assignee: KOMATSU LTD.Inventors: Kota Imanishi, Hiroyuki Chikugo, Shuuji Hori, Mitsumasa Akashi, Akira Hasebe, Shuki Akushichi, Nobumasa Takamatsu
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Patent number: 9309648Abstract: 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.Type: GrantFiled: June 1, 2015Date of Patent: April 12, 2016Assignee: KOMATSU LTD.Inventors: Kota Imanishi, Hiroyuki Chikugo, Shuuji Hori, Mitsumasa Akashi, Akira Hasebe, Shuki Akushichi, Nobumasa Takamatsu
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Publication number: 20150345991Abstract: A stroke detection device includes: four rods provided, moveably along respective axial directions, side by side on a same circumference of a device body, the stroke detection device detecting a change in relative positions of the four rods at a time the rods perform a stroke with respect to the device body; a magnet disposed to each of the rods such that a magnetic field is generated between rods adjacent to each other on the circumference and that the magnetic field varies at a time the rods adjacent to each other on the circumference perform a stroke relatively; and magnetic field detection units disposed on at least three positions between the magnets adjacent to each other in the device body, each of the magnetic field detection unit detecting the magnetic field between the magnets and outputting an electric signal in accordance with the detected magnetic field.Type: ApplicationFiled: October 6, 2014Publication date: December 3, 2015Applicant: Komatsu Ltd.Inventors: Masato Kageyama, Yoshiyuki Nagaya, Hiroyuki Chikugo, Daigoh Fujii
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Publication number: 20150259886Abstract: 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.Type: ApplicationFiled: June 1, 2015Publication date: September 17, 2015Inventors: Kota IMANISHI, Hiroyuki CHIKUGO, Shuuji HORI, Mitsumasa AKASHI, Akira HASEBE, Shuki AKUSHICHI, Nobumasa TAKAMATSU
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Publication number: 20150259885Abstract: 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.Type: ApplicationFiled: June 1, 2015Publication date: September 17, 2015Inventors: Kota IMANISHI, Hiroyuki CHIKUGO, Shuuji HORI, Mitsumasa AKASHI, Akira HASEBE, Shuki AKUSHICHI, Nobumasa TAKAMATSU
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Publication number: 20150259884Abstract: 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.Type: ApplicationFiled: June 1, 2015Publication date: September 17, 2015Inventors: Kota IMANISHI, Hiroyuki CHIKUGO, Shuuji HORI, Mitsumasa AKASHI, Akira HASEBE, Shuki AKUSHICHI, Nobumasa TAKAMATSU
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Patent number: 9085319Abstract: 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.Type: GrantFiled: April 19, 2012Date of Patent: July 21, 2015Assignee: KOMATSU LTD.Inventors: Kota Imanishi, Hiroyuki Chikugo, Shuuji Hori, Mitsumasa Akashi, Akira Hasebe, Shuki Akushichi, Nobumasa Takamatsu
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Publication number: 20140083792Abstract: 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.Type: ApplicationFiled: April 19, 2012Publication date: March 27, 2014Applicant: KOMATSU LTD.Inventors: Kota Imanishi, Hiroyuki Chikugo, Shuuji Hori, Mitsumasa Akashi, Akira Hasebe, Shuki Akushichi, Nobumasa Takamatsu
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Patent number: 8468909Abstract: An electric lever device includes a detent mechanism 6 between the rotational center shaft 3 and the handgrip 2. The detent mechanism 6 includes a pressing unit 10 including a through hole 11 formed in an axis C1 direction of the operation lever 1, an extension coil spring 12 inserted into the through hole 11 and balls 13a and 13b provided on both ends of the extension coil spring 12 for generating pressing force in the axis C 1 direction, and a guide unit 20 for guiding movement in a circumferential direction of the axis C 1 and changing the pressing force by changing a guide width in the axis C1 direction to apply a load to the movement of the operation lever 1 together with pulling force of a twisted coil spring 30.Type: GrantFiled: November 16, 2009Date of Patent: June 25, 2013Assignee: Komatsu Ltd.Inventors: Shuuji Hori, Mitsumasa Akashi, Hiroyuki Chikugo
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Publication number: 20110226087Abstract: An electric lever device includes a detent mechanism 6 between the rotational center shaft 3 and the handgrip 2. The detent mechanism 6 includes a pressing unit 10 including a through hole 11 formed in an axis C1 direction of the operation lever 1, an extension coil spring 12 inserted into the through hole 11 and balls 13a and 13b provided on both ends of the extension coil spring 12 for generating pressing force in the axis C 1 direction, and a guide unit 20 for guiding movement in a circumferential direction of the axis C 1 and changing the pressing force by changing a guide width in the axis C1 direction to apply a load to the movement of the operation lever 1 together with pulling force of a twisted coil spring 30.Type: ApplicationFiled: November 16, 2009Publication date: September 22, 2011Applicant: Komatsu Ltd.Inventors: Shuuji Hori, Mitsumasa Akashi, Hiroyuki Chikugo