Patents by Inventor Shigeyuki Sakurai
Shigeyuki Sakurai 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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Publication number: 20230333549Abstract: A component life prediction system 1 includes a server device 10 configured to be able to communicate with a work machine 2, and capable of predicting the life of a component of the work machine 2. The server device 10 acquires operation information of the work machine 2 including information about the operation location of the work machine 2, and a pre-stored aerial photo of the operation location of the work machine 2; estimates the industry in which the work machine 2 is used based on the acquired operation information of the work machine 2 and aerial photo of the operation location; and predicts the life of the component of the work machine 2, based on the estimated industry.Type: ApplicationFiled: January 18, 2022Publication date: October 19, 2023Inventors: Takashi OKUMURA, Hiroyuki KONNO, Satoshi INOSE, Shigeyuki SAKURAI, Shinichi OKU, Tomohiro YONEDA
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Publication number: 20220403878Abstract: Provided is a sliding component having a low coefficient of friction and capable of exerting stable sliding characteristics from the initial stage of sliding, and a manufacturing method capable of easily manufacturing the sliding component. A sliding component (1) includes an iron substrate (10), in which graphite particles (13) are dispersed in an iron base (11), and a tin coating (20) formed on the iron substrate (10), the tin coating (20) including tin as a main material. The graphite particles (13) of the sliding component (1) are exposed through the tin coating (20). The manufacturing method includes: a preparation step of preparing an iron substrate (10) including graphite particles (13) dispersed in an iron base (11); and a film forming step of forming a tin coating (20) on the surface of the iron substrate (10), the tin coating (20) including tin as a main material. The film forming step forms the tin coating (20) so that the graphite particles (13) are exposed through the tin coating (20).Type: ApplicationFiled: November 10, 2020Publication date: December 22, 2022Inventors: Hatsuhiko USAMI, Hideki AKITA, Shuichi KOBAYASHI, Shigeyuki SAKURAI, Wataru MINAMI
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Publication number: 20220298755Abstract: There is provided a construction machine that is capable of measuring a minute leakage flow rate of a one-sided tilting variable displacement hydraulic pump. The construction machine includes a pressure sensor that detects a pressure of a hydraulic pump, a bleed-off adjusting device that is enabled to adjust a bleed-off flow rate of the hydraulic pump, and an input device that gives an instruction for measurement of a leakage flow rate of the hydraulic pump.Type: ApplicationFiled: October 13, 2020Publication date: September 22, 2022Inventors: Tsutomu UDAGAWA, Junji YAMAMOTO, Shigeyuki SAKURAI, Yukihito SUZUKI
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Patent number: 11274418Abstract: A hydraulic work machine is provided in which left and right hydraulic motors are driven independently of each other by two hydraulic pumps and in which an anomaly of any of the left and right track devices can be detected with high accuracy. The hydraulic work machine includes a first pressure sensor 13 configured to detect a first pump pressure that is a delivery pressure of a first hydraulic pump 11 and a second pressure sensor 23 configured to detect a second pump pressure that is a delivery pressure of a second hydraulic pump 21.Type: GrantFiled: August 9, 2018Date of Patent: March 15, 2022Assignee: Hitachi Construction Machinery Co., Ltd.Inventors: Tsutomu Udagawa, Shigeyuki Sakurai, Yukihito Suzuki
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Publication number: 20210301502Abstract: A cost required to perform the diagnosis of the degradation such as a reduction in output power of an engine while engine degradation diagnosis accuracy is improved. To this end, a controller 37 (engine diagnosing device) determines whether a hydraulic pump 12 is in a preset loaded state (an operation scene where a load torque of the hydraulic pump 12 is in a stable state) for acquiring diagnosis data of an engine 10, and validates a controlled variable related to a torque command value Ta of speed sensing control as the diagnosis data of the engine 10 when it is determined that the hydraulic pump 12 is in the present loaded state, generates time history data using this validated controlled variable as a current feature variable, and enables this time history data to be displayed as trend data for engine diagnosis on a display device 38.Type: ApplicationFiled: April 18, 2019Publication date: September 30, 2021Inventors: Tsutomu UDAGAWA, Junji YAMAMOTO, Shigeyuki SAKURAI, Yukihito SUZUKI, Hidenobu TSUKADA, Atsushi KANDA
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Publication number: 20200018043Abstract: A hydraulic work machine is provided in which left and right hydraulic motors are driven independently of each other by two hydraulic pumps and in which an anomaly of any of the left and right track devices can be detected with high accuracy. The hydraulic work machine includes a first pressure sensor 13 configured to detect a first pump pressure that is a delivery pressure of a first hydraulic pump 11 and a second pressure sensor 23 configured to detect a second pump pressure that is a delivery pressure of a second hydraulic pump 21.Type: ApplicationFiled: August 9, 2018Publication date: January 16, 2020Inventors: Tsutomu UDAGAWA, Shigeyuki SAKURAI, Yukihito SUZUKI
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Patent number: 9915249Abstract: Disclosed is hydraulic rotating equipment provided with a rotating shaft, a cylinder block including a plurality of cylinders, a like plurality of pistons accommodated in the cylinders, respectively, and a valve plate maintained in slide contact with a rear end surface of the cylinder block. The valve plate includes a low-pressure port communicable with the cylinders, a high-pressure port formed in an arcuate shape over a predetermined angle along a circumferential direction of the rotating shaft and communicable with the cylinders, a seal land maintained in slide contact with the rear end surface, and a sliding contact member arranged on a periphery of the seal land in a range of the predetermined angle along the circumferential direction of the rotating shaft and maintained in slide contact with the rear end surface. A working machine provided with the hydraulic rotating equipment is also disclosed.Type: GrantFiled: December 16, 2014Date of Patent: March 13, 2018Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.Inventors: Kenta Suzuki, Motoshi Suzuki, Shigeyuki Sakurai, Makoto Hemmi
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Patent number: 9404535Abstract: A sliding bearing assembly for joints of construction equipment can be provided, in which production cost is reduced by decreasing the used amount of Cu and sulfides having high fixability to a matrix are dispersed. The sliding bearing assembly for joints of construction equipment, includes at least a shaft and a bush made of an iron-based sintered material which functions as a sliding bearing, in which the bush has the overall composition of, by mass %, 0.1 to 10% of Cu, 0.2 to 1.2% of C, 0.03 to 0.9% of Mn, 0.36 to 1.68% of S, and the balance of Fe and inevitable impurities, a metal structure has pores dispersed in a matrix mainly including a martensite structure and sulfide particles precipitated and dispersed, and the sulfide particles are dispersed at 1 to 7 volume % in the matrix.Type: GrantFiled: September 24, 2013Date of Patent: August 2, 2016Assignee: HITACHI CHEMICAL COMPANY, LTD.Inventors: Hidekazu Tokushima, Hideaki Kawata, Daisuke Fukae, Osamu Mawatari, Hideki Akita, Makoto Sugaya, Akiko Satou, Osamu Gokita, Shigeyuki Sakurai
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Patent number: 9260143Abstract: A floating seal (23) is provided between a mounting bracket (12) fixed to a side frame (6) and a roller (15) rotatable with respect to this mounting bracket (12), and lubricant oil (L) collected in the roller (15) is sealed by this floating seal (23). On the other hand, an air permeable plug (31) provided with an air permeable member (34) made of a porous material of interconnected cells is provided on a lid member (17) of the roller (15), air and/or water vapor is made to flow between the inside and the outside of the roller (15) and flow of lubricant oil (L) and/or rainwater and dusts is prevented by the air permeable member (34) of the air permeable plug (31). As a result, the pressure of the inside and the pressure of the outside of the roller (15) can be made equal all the time.Type: GrantFiled: April 28, 2011Date of Patent: February 16, 2016Assignee: Hitachi Construction Machinery Co., Ltd.Inventors: Hideki Akita, Shigeyuki Sakurai, Yuuji Igawa
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Publication number: 20150240870Abstract: A sliding bearing assembly for joints of construction equipment can be provided, in which production cost is reduced by decreasing the used amount of Cu and sulfides having high fixability to a matrix are dispersed. The sliding bearing assembly for joints of construction equipment, includes at least a shaft and a bush made of an iron-based sintered material which functions as a sliding bearing, in which the bush has the overall composition of, by mass %, 0.1 to 10 % of Cu, 0.2 to 1.2% of C, 0.03 to 0.9% of Mn, 0.36 to 1.68% of S, and the balance of Fe and inevitable impurities, a metal structure has pores dispersed in a matrix mainly including a martensite structure and sulfide particles precipitated and dispersed, and the sulfide particles are dispersed at 1 to 7 volume % in the matrix.Type: ApplicationFiled: September 24, 2013Publication date: August 27, 2015Inventors: Hidekazu Tokushima, Hideaki Kawata, Daisuke Fukae, Osamu Mawarari, Hideki Akita, Makoto Sugaya, Akiko Satou, Osamu Gokita, Shigeyuki Sakurai
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Publication number: 20150167650Abstract: Disclosed is hydraulic rotating equipment provided with a rotating shaft, a cylinder block including a plurality of cylinders, a like plurality of pistons accommodated in the cylinders, respectively, and a valve plate maintained in slide contact with a rear end surface of the cylinder block. The valve plate includes a low-pressure port communicable with the cylinders, a high-pressure port formed in an arcuate shape over a predetermined angle along a circumferential direction of the rotating shaft and communicable with the cylinders, a seal land maintained in slide contact with the rear end surface, and a sliding contact member arranged on a periphery of the seal land in a range of the predetermined angle along the circumferential direction of the rotating shaft and maintained in slide contact with the rear end surface. A working machine provided with the hydraulic rotating equipment is also disclosed.Type: ApplicationFiled: December 16, 2014Publication date: June 18, 2015Inventors: Kenta SUZUKI, Motoshi SUZUKI, Shigeyuki SAKURAI, Makoto HEMMI
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Publication number: 20150016761Abstract: The invention pertains to a bearing device used for a connecting part of a construction machine. The bearing device has: a boom having a boss part; an arm having left and right brackets that sandwich the boss part from the left and right sides thereof; a bush that is retained by an inner peripheral side of the boss part; a sealing that is disposed between the bush and the left and right brackets and that prevents a lubricant from leaking out of the bush; a thrust plate inserted between the left and right brackets and the boss part; and a coupling pin that penetrates and is inserted through the left and right brackets and the bush. The thrust plate has a partially cut out annular shape and an angle of a cut-out portion in the circumferential direction is less than 180° at an inner peripheral portion.Type: ApplicationFiled: October 18, 2012Publication date: January 15, 2015Inventors: Hideki Akita, Shigeyuki Sakurai, Akiko Satou, Osamu Gokita
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Patent number: 8821022Abstract: Provided are a novel sliding bearing and a construction machine provided with same, the sliding bearing being capable of maintaining an excellent sliding performance over a long period of time and exhibiting an excellent strength. A sliding bearing includes at least a brush and a shaft part, the shaft part being provided with a grease feeding pathway for feeding grease from the exterior to the sliding surfaces of the shaft part and the bush, the bush being formed from a porous sintered metal, and a decomposition catalyst being adhered to the sliding surface of the bush.Type: GrantFiled: December 5, 2011Date of Patent: September 2, 2014Assignee: Hitachi Construction Machinery Co., Ltd.Inventors: Hideki Akita, Osamu Gokita, Shigeyuki Sakurai, Yasuchika Nagai
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Publication number: 20130285439Abstract: A floating seal (23) is provided between a mounting bracket (12) fixed to a side frame (6) and a roller (15) rotatable with respect to this mounting bracket (12), and lubricant oil (L) collected in the roller (15) is sealed by this floating seal (23). On the other hand, an air permeable plug (31) provided with an air permeable member (34) made of a porous material of interconnected cells is provided on a lid member (17) of the roller (15), air and/or water vapor is made to flow between the inside and the outside of the roller (15) and flow of lubricant oil (L) and/or rainwater and dusts is prevented by the air permeable member (34) of the air permeable plug (31). As a result, the pressure of the inside and the pressure of the outside of the roller (15) can be made equal all the time.Type: ApplicationFiled: April 28, 2011Publication date: October 31, 2013Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.Inventors: Hideki Akita, Shigeyuki Sakurai, Yuuji Igawa
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Publication number: 20130279835Abstract: Provided are a novel sliding bearing and a construction machine provided with same, the sliding bearing being capable of maintaining an excellent sliding performance over a long period of time and exhibiting an excellent strength. A sliding bearing (100) includes at least a brush (10) and a shaft part (20), the shaft part (20) being provided with a grease feeding pathway (70) for feeding grease (G) from the exterior to the sliding surfaces of the shaft part (20) and the bush (10), the bush (10) being formed from a porous sintered metal, and a decomposition catalyst (S) being adhered to the sliding surface of the bush (10).Type: ApplicationFiled: December 5, 2011Publication date: October 24, 2013Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.Inventors: Hideki Akita, Osamu Gokita, Shigeyuki Sakurai, Yasuchika Nagai
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Publication number: 20110111995Abstract: In this grease composition, a grease produced by mixing at least one base oil selected from a mineral oil-type lubricant base oil, a synthetic lubricant base oil, and a biodegradable lubricant base oil with a thickener is compounded with a wax and water, and an additive such as a surfactant and a defoamer is optionally compounded therewith. A soap containing a calcium sulfonate complex is used as the thickener. A carnauba wax is preferably used as the wax. Since this grease composition is mainly composed of a grease and a wax, the grease composition extremely facilities its removal operation after application, is environmentally friendly, and has extremely excellent anti-corrosion performance. When the grease composition is used by being applied to a base material of an object to be welded, an effect of preventing the adhesion of welding spatters can be obtained.Type: ApplicationFiled: October 27, 2008Publication date: May 12, 2011Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.Inventors: Hideki Akita, Shigeyuki Sakurai, Osamu Gokita, Shinichi Sekido, Masafumi Senzaki, Yasuchika Nagai, Mitsuhiro Yamamoto, Tooru Nakajima, Mitsuru Komachi, Hiroshi Nishimura, Jun Araki
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Patent number: 7005607Abstract: A welding method is disclosed for butt welding a first base material 1 and a second base material 2 with each other. To also permit stable and efficient formation of a bead in the form of a fillet weld on a back side of a groove by conducting arc welding from the side of the groove without arranging a bead beforehand on the back side of the groove, the first member 1, on which a root face 1a and a single groove face 1b have been formed, is brought at its root face 1a into contact with a flat surface 2a of the second base material 2. A welding wire 6 is arranged facing on the groove formed by the contact between the first base material 1 and the second base material 2. The first base material 1 and the second material 2 are caused to fuse at an area of contact between them by an arc from the welding wire 6. A melt, which has been formed by the fusion at the area of contact and the like, is forced out to the back side of the groove to form a bead B4 in the form of a fillet weld on the back side of the groove.Type: GrantFiled: February 18, 2002Date of Patent: February 28, 2006Assignee: Hitachi Construction Machinery Co., Ltd.Inventors: Toru Takatani, Yutaka Takano, Naoki Miyanagi, Hikaru Yamamoto, Shigeyuki Sakurai, Manabu Hirakawa
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Publication number: 20050163408Abstract: A bearing apparatus has a porous bush (9) impregnated with lubricant and a shaft (10) supported by the bush (9). The shaft (10) has a quench hardened section (10a) formed in the form of a projection, and an indentation (10b) which is formed between portions of the quench hardened section (10a) and traps lubricant flowing out of the bush (9).Type: ApplicationFiled: August 21, 2003Publication date: July 28, 2005Inventors: Yusuke Wakabayashi, Naoki Miyanagi, Shigeyuki Sakurai, Osamu Gokita, Hideki Akita
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Publication number: 20040074885Abstract: A welding method is disclosed for butt welding a first base material 1 and a second base material 2 with each other. To also permit stable and efficient formation of a bead in the form of a fillet weld on a back side of a groove by conducting arc welding from the side of the groove without arranging a bead beforehand on the back side of the groove, the first member 1, on which a root face 1a and a single groove face 1b have been formed, is brought at its root face 1a into contact with a flat surface 2a of the second base material 2. A welding wire 6 is arranged facing on the groove formed by the contact between the first base material 1 and the second base material 2. The first base material 1 and the second material 2 are caused to fuse at an area of contact between them by an arc from the welding wire 6. A melt, which has been formed by the fusion at the area of contact and the like, is forced out to the back side of the groove to form a bead B4 in the form of a fillet weld on the back side of the groove.Type: ApplicationFiled: August 18, 2003Publication date: April 22, 2004Inventors: Toru Takatani, Yutaka Takano, Naoki Miyanagi, Hikaru Yamamoto, Shigeyuki Sakurai, Manabu Hirakawa
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Patent number: 6596969Abstract: In an arc welding method and apparatus, a plasma (13) is generated at a welding intended position on a base material (2) by a laser (16) irradiated to the base material (2). When a discharge electrode (12) is at a minus potential, an arc discharge (4) takes place in the direction of the plasma (13) and is induced at a position irradiated with the laser (16). When the electrode (12) is at a plus potential, arc electrons are generated from a laser irradiated point and discharged to the electrode (12). When a voltage applied between the electrode (12) and the base material (2) is alternating, the polarities of the electrode (12) and the base material (2) alternately change so that the foregoing phenomena alternately occur. When the base material (2) is at a minus potential, an arc discharge (4) takes place from a laser spot.Type: GrantFiled: November 15, 2000Date of Patent: July 22, 2003Assignee: Hitachi Construction Machinery Co., Ltd.Inventors: Shigeyuki Sakurai, Yutaka Takano, Naoki Miyanagi, Yoshiaki Shimomura, Hikaru Yamamoto, Toru Takatani