Patents by Inventor Akira Tsutsui
Akira Tsutsui 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: 11293163Abstract: A hydraulic drive apparatus includes a boom flow rate control valve, a target boom cylinder speed calculation part, a pressing force calculation part, a correction part, and a boom flow rate operation part. The target boom cylinder speed calculation part calculates a target boom cylinder speed for making the construction surface by the bucket closer to the target construction surface. The pressing force calculation part calculates the pressing force by which the bucket is pressed against the construction surface, based on the cylinder thrust of the boom cylinder and the center-of-gravity position information on the center-of-gravity position of the work device. The correction part corrects the target boom cylinder speed to make the deviation between the target pressing force and the calculated pressing force closer to 0. The boom flow rate operation part operates the boom flow rate control valve to provide the corrected target boom cylinder speed.Type: GrantFiled: July 24, 2019Date of Patent: April 5, 2022Assignees: Kobe Steel, Ltd., KOBELCO CONSTRUCTION MACHINERY CO., LTD.Inventors: Toshihiro Nogi, Satoshi Maekawa, Akira Tsutsui, Sho Fujiwara
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Publication number: 20210301492Abstract: A hydraulic drive apparatus includes a boom flow rate control valve, a target boom cylinder speed calculation part, a pressing force calculation part, a correction part, and a boom flow rate operation part. The target boom cylinder speed calculation part calculates a target boom cylinder speed for making the construction surface by the bucket closer to the target construction surface. The pressing force calculation part calculates the pressing force by which the bucket is pressed against the construction surface, based on the cylinder thrust of the boom cylinder and the center-of-gravity position information on the center-of-gravity position of the work device. The correction part corrects the target boom cylinder speed to make the deviation between the target pressing force and the calculated pressing force closer to 0. The boom flow rate operation part operates the boom flow rate control valve to provide the corrected target boom cylinder speed.Type: ApplicationFiled: July 24, 2019Publication date: September 30, 2021Applicants: KABUSHIKI KAISHA KOBE SEIKO SHO (Kobe Steel, Ltd.), KOBELCO CONSTRUCTION MACHINERY CO., LTD.Inventors: Toshihiro NOGI, Satoshi MAEKAWA, Akira TSUTSUI, Sho FUJIWARA
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Patent number: 10355625Abstract: This DC brushless motor (1) is provided with a stator (2) that has exciting coils (31, 32) and a rotor (4) that is positioned coaxially to the stator (2). The stator (2) has a quasi-E-shaped cross-section in the axial direction at the radius part; a plurality of protrusions (212, 222, 232) serving as magnetic poles are formed on the respective 3 parallel sections (211, 221, 231) of the E in the same number in the circumferential direction; and of the magnetic poles (212, 222, 232) formed at the 3 parallel sections (211, 221, 231) of the E, the top and the bottom magnetic poles (212, 232) are respectively positioned so as to be shifted in the opposite directions in the circumferential direction with respect to the center line of the middle magnetic pole (222). Changes in the magnetic resistance between the stator (2) and the rotor (4), which are caused by the flow of a magnetic flux generated around the exciting coils (31, 32), are utilized as a driving force.Type: GrantFiled: November 18, 2011Date of Patent: July 16, 2019Assignee: Kobe Steel, Ltd.Inventors: Akira Tsutsui, Kenichi Inoue, Kyoji Zaitsu
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Patent number: 9000630Abstract: Provided is a motor including a rotor, a stator having a stator core and a coil, a stator frame, an end cover, first and second bearings, and a heat radiating resin in the stator frame. The coil includes first and second end portions projecting oppositely and axially. The stator frame includes a peripheral wall and an end wall, whose respective central parts form first and second boss portions holding the first and second bearings respectively. The heat radiating resin includes a first resin part covering the first end portion and closely contacting an inner surface of the stator frame, and a second resin part covering the second end portion and separating from an outer peripheral surface of the second boss portion. The first resin part has a portion between the first end portion and the first boss portion, the portion having a greater thickness than that of the other.Type: GrantFiled: October 25, 2012Date of Patent: April 7, 2015Assignees: Kobe Steel, Ltd., Kobelco Construction Machinery Co., Ltd.Inventors: Akira Tsutsui, Seiji Saiki, Kazushige Koiwai, Akira Nakazumi
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Publication number: 20130234540Abstract: This DC brushless motor (1) is provided with a stator (2) that has exciting coils (31, 32) and a rotor (4) that is positioned coaxially to the stator (2). The stator (2) has a quasi-E-shaped cross-section in the axial direction at the radius part; a plurality of protrusions (212, 222, 232) serving as magnetic poles are formed on the respective 3 parallel sections (211, 221, 231) of the E in the same number in the circumferential direction; and of the magnetic poles (212, 222, 232) formed at the 3 parallel sections (211, 221, 231) of the E, the top and the bottom magnetic poles (212, 232) are respectively positioned so as to be shifted in the opposite directions in the circumferential direction with respect to the center line of the middle magnetic pole (222). Changes in the magnetic resistance between the stator (2) and the rotor (4), which are caused by the flow of a magnetic flux generated around the exciting coils (31, 32), are utilized as a driving force.Type: ApplicationFiled: November 18, 2011Publication date: September 12, 2013Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD)Inventors: Akira Tsutsui, Kenichi Inoue, Lyoji Zaitsu
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Patent number: 8511490Abstract: A slewing stop control apparatus and method, capable of executing, while performing the control of determining the target slewing velocity based on a remaining slewing angle from the actual slewing motion position up to the slewing stop angular position, an automatic control of re-slewing the slewing structure having been stopped before the slewing stop angular position. The apparatus executes slewing angular velocity control for deciding the slewing braking start timing to stop the stewing structure at a slewing stop angular position in accordance with a predetermined slewing deceleration and the subsequent target slewing angular velocity, based on the remaining slewing angle of the slewing structure. When the slewing structure stops before the slewing stop angular position due to disturbance despite the foregoing control, the target slewing angular velocity is corrected to be increased for generating slewing torque to restart the slewing.Type: GrantFiled: April 13, 2010Date of Patent: August 20, 2013Assignees: Kobe Steel, Ltd., Kobelco Cranes Co., Ltd.Inventors: Hiroaki Kawai, Akira Tsutsui, Koichi Shimomura
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Patent number: 8505292Abstract: Provided is a braking control apparatus for a slewing type working machine capable of giving a braking operation easily intuitively grasped.Type: GrantFiled: April 8, 2010Date of Patent: August 13, 2013Assignees: Kobe Steel, Ltd., Kobelco Cranes Co., Ltd.Inventors: Akira Tsutsui, Hiroaki Kawai, Takahiro Kobayashi, Koichi Shimomura
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Publication number: 20130200744Abstract: This brushless DC motor (1) is provided with a stator (3) having a main body (312, 322) disposed on both ends thereof in the rotational axis direction with a single exciting coil (2) disposed between the main bodies (312, 322), and with a rotor (4) disposed in the interior of the stator (3), wherein main body (312) is formed with a first magnetic core (31) and main body (322) is formed with a second magnetic core (32), the magnetic cores (31, 32) functioning as a magnetic pole and having protrusions (311, 321), the quantity of which being different for each magnetic core (31, 32). The brushless DC motor (1) uses, as the driving force, the variation in the magnetic resistance between the stator (3) and the rotor (4) in relation to the flow of the magnetic flux generated in the periphery of the exciting coil (2).Type: ApplicationFiled: October 4, 2011Publication date: August 8, 2013Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO (Kobe Steel, Ltd.)Inventors: Takeo Miyamura, Kenichi Inoue, Akira Tsutsui, Hiroshi Hashimoto, Hiroyuki Mitani, Kyoji Zaitsu
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Patent number: 8190334Abstract: An excavator has a controller capable of setting target torque of a rotation motor in accordance with a speed deviation between target speed set in accordance with an operation amount of an operating lever and actual rotation speed and is provided with an inverter for detecting necessary torque for rotating an upper rotating body, the necessary torque being changed in accordance with a working state of the upper rotating body. The controller calculates a correction amount which is increased as increasing the torque and subtracts the correction amount from the target speed so as to set new target speed. A controller sets first target torque for driving the motor and second target torque for maintaining the upper rotating body on the spot on the basis of the actual speed, and operates the motor in accordance with the torque which has a larger absolute value in the same direction as the first target torque among both the torque.Type: GrantFiled: February 20, 2008Date of Patent: May 29, 2012Assignee: Kobelco Construction Machinery Co., Ltd.Inventors: Masayuki Kagoshima, Akira Tsutsui, Masayuki Komiyama
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Publication number: 20100264106Abstract: This invention provides a slewing stop control apparatus and method, capable of executing, while performing the control of determining the target slewing velocity based on a remaining slewing angle from the actual slewing motion position up to the slewing stop angular position, an automatic control of re-slewing the slewing structure having been stopped before the slewing stop angular position due to disturbance to move it to the slewing stop angular position without inconvenience. The apparatus executes slewing angular velocity control for deciding the slewing braking start timing to stop the slewing structure at a slewing stop angular position in accordance with a predetermined slewing deceleration and the subsequent target slewing angular velocity, based on the remaining slewing angle of the slewing structure.Type: ApplicationFiled: April 13, 2010Publication date: October 21, 2010Applicants: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel Ltd.), Kobelco Cranes Co., Ltd.Inventors: Hiroaki KAWAI, Akira TSUTSUI, Koichi SHIMOMURA
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Publication number: 20100263364Abstract: Provided is a braking control apparatus for a slewing type working machine capable of giving a braking operation easily intuitively grasped.Type: ApplicationFiled: April 8, 2010Publication date: October 21, 2010Applicants: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.), Kobelco Cranes Co., Ltd.Inventors: Akira Tsutsui, Hiroaki Kawai, Takahiro Kobayashi, Koichi Shimomura
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Patent number: 7421890Abstract: A tire HIL simulator is provided which is capable of, in a testing apparatus where a vehicle model is incorporated into a tire testing apparatus, reproducing the behavior of a tire which corresponds to the three-dimensional behavior of a vehicle, even if a three-dimensional vehicle model is used. As a device for resolving this, this tire HIL simulator includes a tire testing apparatus 2 and a controller 3 connected mutually. The tire testing apparatus 2 conducts a running test on a tire 4a using a mimic road surface body 4, and includes a side force measuring device 37 for measuring a tire side force and each actuator which gives a contact load, a side-slip angle and a camber angle, respectively.Type: GrantFiled: May 16, 2005Date of Patent: September 9, 2008Assignees: Kabushiki Kaisha Kobe Seiko Sho, The University of TokyoInventors: Etsujiro Imanishi, Koichi Honke, Akira Tsutsui, Naoki Sugano, Takao Nanjo, Yoshihiro Suda
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Publication number: 20080201045Abstract: An excavator has a controller capable of setting target torque of a rotation motor in accordance with a speed deviation between target speed set in accordance with an operation amount of an operating lever and actual rotation speed and is provided with an inverter for detecting necessary torque for rotating an upper rotating body, the necessary torque being changed in accordance with a working state of the upper rotating body. The controller calculates a correction amount which is increased as increasing the torque and subtracts the correction amount from the target speed so as to set new target speed. A controller sets first target torque for driving the motor and second target torque for maintaining the upper rotating body on the spot on the basis of the actual speed, and operates the motor in accordance with the torque which has a larger absolute value in the same direction as the first target torque among both the torque.Type: ApplicationFiled: February 20, 2008Publication date: August 21, 2008Applicant: KOBELCO CONSTRUCTION MACHINERY CO., LTD.Inventors: Masayuki KAGOSHIMA, Akira TSUTSUI, Masayuki KOMIYAMA
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Publication number: 20070256484Abstract: A tire HIL simulator is provided which is capable of, in a testing apparatus where a vehicle model is incorporated into a tire testing apparatus, reproducing the behavior of a tire which corresponds to the three-dimensional behavior of a vehicle, even if a three-dimensional vehicle model is used. As a device for resolving this, this tire HIL simulator includes a tire testing apparatus 2 and a controller 3 connected mutually. The tire testing apparatus 2 conducts a running test on a tire 4a using a mimic road surface body 4, and includes a side force measuring device 37 for measuring a tire side force and each actuator which gives a contact load, a side-slip angle and a camber angle, respectively.Type: ApplicationFiled: May 16, 2005Publication date: November 8, 2007Inventors: Etsujiro Imanishi, Koichi Honke, Akira Tsutsui, Naoki Sugano, Takao Nanjo, Yoshihiro Suda
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Patent number: 5752775Abstract: The boundary between the rolling surface 3a and the larger end surface 3b of a roller 3 and the boundary between the rolling surface 3a and the smaller end surface 3c are formed with rounded portions Rb and Rc, respectively. The rolling surface 3a and the rounded portion Rb associated with the larger end surface 3b are smoothly continuous with each other through a first arc R1, while the larger end surface 3b and the rounded portion Rb are smoothly continuous with each other through a second arc R2.Type: GrantFiled: August 29, 1995Date of Patent: May 19, 1998Assignee: NTN CorporationInventors: Akira Tsutsui, Kimihiro Hanai, Yasuhiro Shimizu