Patents by Inventor Isao Tomita
Isao Tomita 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: 20180188456Abstract: A pluggable optical connector is configured to be insertable into and removable from an optical communication apparatus, and to be capable of communicating a modulation signal and a data signal with the optical communication apparatus. A wavelength-tunable light source is configured to output an output light and a local oscillation light. An optical transmission unit is configured to output an optical signal generated by modulating the output light in response to the modulation signal. An optical reception unit is configured to demodulate an optical signal received by using the local oscillation light to the data signal. Pluggable optical receptors are configured in such a manner that an optical fiber is insertable into and removable from the pluggable optical receptors, and configured to be capable of outputting the optical signal to the optical fiber and transferring the optical signal received thorough the optical fiber to the optical reception unit.Type: ApplicationFiled: June 7, 2016Publication date: July 5, 2018Applicant: NEC CORPORATIONInventor: Isao TOMITA
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Publication number: 20180149170Abstract: A scroll casing forms a scroll flow passage of a centrifugal compressor, and provided that, in a cross section of the scroll flow passage, pEi is an inner end of the scroll flow passage in a radial direction of the centrifugal compressor, and Mh is a middle point of a maximum flow-passage height Hmax of the scroll flow passage in the axial direction of the centrifugal compressor, the scroll flow passage has a separation suppressing cross section in which the inner end Ei is disposed on an inner side, in the radial direction, of a diffuser outlet, and the inner end Ei is disposed on a back side, in the axial direction, of the middle point Mh, in a section disposed at least partially in an upstream region of a connection position of a scroll start and a scroll end.Type: ApplicationFiled: October 29, 2015Publication date: May 31, 2018Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Kenichiro IWAKIRI, Isao TOMITA, Takashi SHIRAISHI
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Patent number: 9926938Abstract: In a variable geometry turbocharger including a variable nozzle mechanism, an object is to enhance safety upon malfunction of the variable nozzle mechanism as well as to improve accuracy in the control of the variable nozzle mechanism by applying a moment that acts on the nozzle vanes in an opening direction securely and stably.Type: GrantFiled: February 26, 2013Date of Patent: March 27, 2018Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Takao Yokoyama, Katsuyuki Osako, Isao Tomita, Yasuaki Jinnai, Masaki Tojo, Satomi Nagae
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Publication number: 20180045211Abstract: This impeller cover is provided with: a machinable abradable seal section which has a shroud surface, which faces the outer peripheral surface of an impeller rotating about its axis, and which provides a seal between the outer peripheral surface and the shroud surface; a cover body which covers the impeller from the outside and which has a seal housing section for housing the abradable seal section therein; and a filling material which is interposed between the abradable seal section and the cover body.Type: ApplicationFiled: March 24, 2015Publication date: February 15, 2018Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Ryoji OKABE, Yasunori WATANABE, Isao TOMITA, Takashi ARAI, Hiroyuki ARIMIZU
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Publication number: 20170335858Abstract: This impeller is provided with: an impeller body having a disk-like shape and rotating about an axis together with a rotating shaft; and compressor blades (25) provided so as to protrude from the hub surface (31b) of the impeller body, the hub surface (31b) being formed on the front surface side of the impeller body, the compressor blades (25) each having a pair of side surfaces (26) which faces the circumferential direction of the rotating shaft and along which fluid flows. Each of the compressor blades (25) is formed in a tapered shape so that, within a range in which stress in the direction of the axis of at least the rotating shaft is maximum, the pair of side surfaces (26), when viewed in a cross-section perpendicular to the axis, approach each other as the pair of side surfaces (26) extends radially outward of the rotating shaft.Type: ApplicationFiled: October 8, 2015Publication date: November 23, 2017Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Ryoji OKABE, Isao TOMITA, Atsushi MATSUO, Yasunori WATANABE
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Patent number: 9797320Abstract: An object is to provide an engine system including an intake bypass device whereby it is possible to expand the operation range of a compressor without causing the output of a turbine to become insufficient. An engine system includes an intake bypass device including a bypass channel connecting a downstream side of a compressor of a turbocharger in an intake channel and an upstream side of a turbine of the turbocharger in an exhaust channel, a bypass valve disposed in the bypass channel and configured to control a flow of compressed intake air in the bypass channel, and a heating unit for heating the compressed intake air flowing through the bypass channel.Type: GrantFiled: October 11, 2013Date of Patent: October 24, 2017Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Takao Yokoyama, Seiichi Ibaraki, Isao Tomita, Katsuyuki Osako
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Patent number: 9790957Abstract: An object is to provide an air intake duct structure for a centrifugal fluid machine, capable of swirling the fluid introduced into the impeller in the reverse direction to increase the pressure ratio when the flow rate is high and swirling the fluid in the forward direction to avoid a surging when the flow rate is low, as well as securing a wide operating range, without using mechanical means. The centrifugal fluid machine 1 includes an impeller 12 mounted to a rotation shaft and a housing 4 for housing the impeller 12. The air intake duct structure 10 is for directing a fluid “f” to a rotational center 12a of the impeller 12 housed in the housing 4 via an intake duct portion 4a of the housing 4 protruding in an axial direction of the rotation shaft, the fluid “f” flowing in a substantially orthogonal direction to a rotational axis line 3.Type: GrantFiled: February 26, 2013Date of Patent: October 17, 2017Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Isao Tomita, Masaki Tojo, Takao Yokoyama
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Publication number: 20170276233Abstract: An oil-drain device for a thrust bearing includes: a rotor shaft; a collar member mounted to an outer periphery of the rotor shaft; a thrust bearing supporting the rotor shaft in an axial direction; and an oil-drain space forming member defining an oil-drain space through which lubricant oil leaking from a sliding portion of the thrust bearing flows, between the thrust bearing and the oil-drain space forming member. The oil-drain space includes: an oil-drain channel defined between a first end surface of the thrust bearing and a first end surface of the oil-drain space forming member, surrounding the flange portion of the collar member; and an oil-drain port formed below the oil-drain channel, for discharging the lubricant oil flowing through the oil-drain channel outside the oil-drain space.Type: ApplicationFiled: December 18, 2014Publication date: September 28, 2017Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Tadasuke NISHIOKA, Yosuke DANMOTO, Isao TOMITA, Takashi NAMBU, Yoji AKIYAMA, Yuya KOJIMA, Tatsuya ISHIZAKI, Seigi YANO, Takaya FUTAE, Motoki EBISU
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Patent number: 9726189Abstract: A turbocharger and a method of manufacturing a floating bush with which noise can be reduced, and the rotation speed can be increased. In a turbocharger in which a rotating shaft having a circular cross-section and connecting a turbine rotor and a compressor rotor is supported in a freely rotatable manner, at two axially separated positions via floating bushes, by an inner circumferential surface disposed so as to surround the rotating shaft in a bearing housing, an inner circumferential surface of each of the floating bushes has a non-circular shape in which the curvature of the cross-sectional shape varies in the circumferential direction.Type: GrantFiled: February 13, 2012Date of Patent: August 8, 2017Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Hideaki Nishida, Keitaro Kamata, Isao Tomita, Takashi Shiraishi, Noriyuki Hayashi, Motoki Ebisu, Hiroshi Suzuki, Hiroshi Ogita
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Publication number: 20170191502Abstract: Provided is a compressor cover that covers a delivery fan which outwardly discharges in the radial direction a fluid sucked in from an axial direction by rotating around the axis, the compressor cover comprising: a cover body that includes a tubular part in which a tubular inner peripheral surface along the axis and a shroud surface that is disposed on an axially downstream side of the tubular inner peripheral surface and expands in diameter toward the downstream side are formed; and a sleeve that includes an outer tube having an outer peripheral surface that is fixed to the tubular inner peripheral surface, an inner tube that is disposed on a radially inner side of the outer tube and defines a recirculation flow path in which a portion of the fluid that is sucked in by the delivery fan circulates between the inner tube and the outer tube, and a plurality of struts that are disposed at intervals in the peripheral direction so as to connect the outer tube and the inner tube, thereby partitioning the recirculatType: ApplicationFiled: July 3, 2014Publication date: July 6, 2017Applicant: Mitsubishi Heavy Industries Engine & Turbocharger Ltd.Inventors: Makoto OZAKI, Hiroshi SUZUKI, Koji WAKASHIMA, Isao TOMITA, Tadashi KANZAKA
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Patent number: 9683445Abstract: An impeller for a centrifugal compressor is characterized in that a shroud side of a front edge 7a of a splitter blade 7 is disposed so as to be displaced toward a negative-pressure surface Sb of a full blade 5F from a position equidistant from the full blades 5R and 5F in a circumferential direction such that a blade-end leakage vortex generated during a high flow rate which occurs from a blade-end clearance between the tip of the full blade 5F and a shroud toward the portion of the front edge 7a of the splitter blade 7 gets over the front edge 7a of the splitter blade 7.Type: GrantFiled: December 5, 2011Date of Patent: June 20, 2017Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Toru Hoshi, Isao Tomita, Kenichiro Iwakiri, Takashi Shiraishi
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Patent number: 9638208Abstract: Provided is a centrifugal compressor including a first splitter blade 7 arranged nearer to a suction side Sb of a full blade 5F located upstream in a rotating direction of the compressor, and a second splitter blade 8 provided farther from the suction side Sb of the full blade 5F and being shorter than the first splitter blade 7. Leading edges 7a and 8a on the shroud side of the first splitter blade 7 and the second splitter blade 8 are offset from positions dividing the space between the full blades at equal intervals by the number of splitter blades therebetween toward the suction side Sb of the full blade.Type: GrantFiled: December 6, 2011Date of Patent: May 2, 2017Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Isao Tomita, Toru Hoshi
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Patent number: 9606310Abstract: In a sealing structure of optical communication module using a sealing material, it has been difficult to secure the reliability without influencing optical fiber characteristics. A sealing structure of optical communication module of the present invention comprises: a cylindrical barrel unit fixed to a package; a cylindrical flange which is disposed inside the barrel unit and through which an optical fiber pierces; and a sealing material disposed between the barrel unit and the flange, wherein the flange has on its surface a plurality of regions having different surface conditions, and the sealing material is disposed in only one of the regions.Type: GrantFiled: November 10, 2014Date of Patent: March 28, 2017Assignee: NEC CorporationInventor: Isao Tomita
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Publication number: 20170074278Abstract: A compressor includes: an impeller including a hub and a plurality of blades disposed on an outer surface of the hub; and a housing which houses the impeller. The housing includes: a shroud section facing the outer surface of the hub to form a fluid flow path between the shroud section and the outer surface, and surrounding the impeller; and a casing section formed integrally with the shroud section and supporting the shroud section. The shroud section includes a first resin-based material having a static tensile strength of at least 65 MPa and no more than 200 MPa and a breaking strain of no more than 0.3 mm/mm at a temperature of 100° C. The casing section includes a second resin-based material having a static tensile strength of at least 40 MPa and a breaking strain of at least 0.1 mm/mm at a temperature of 100° C.Type: ApplicationFiled: July 2, 2014Publication date: March 16, 2017Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Daigo WATANABE, Isao TOMITA, Ryoji OKABE, Hiroshi SUZUKI
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Patent number: 9581046Abstract: In a scroll structure of a centrifugal compressor, there are provided a radius increase arc portion E in which a radius from the center of a scroll 12 to a scroll centroid P of the cross section of the scroll 12 is gradually increased in any range in a circumferential direction from the start of winding of the scroll, and a radius decrease arc portion F in which the radius is gradually decreased toward a scroll end point Z.Type: GrantFiled: December 22, 2011Date of Patent: February 28, 2017Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Toru Hoshi, Isao Tomita, Motoki Ebisu, Hiroshi Suzuki, Takashi Shiraishi
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Patent number: 9562541Abstract: An axial cross-sectional shape of a scroll flow path 13 is a roughly circular shape, a diffuser outlet connected to the roughly circular shape is shifted to a position which is closer to a circle center than to a position of a tangent line to the circular shape and which does not reach the circle center, the circular shape is formed from a scroll chamber 30 which juts out in the axial direction relative to the position of the diffuser outlet 11a and a shift chamber 32 that forms a remainder of the roughly circular shape in a direction opposite to the scroll chamber 30, and the shift chamber 32 is at least formed on the scroll flow path 13 of a winding end portion 19 in a circumferential direction of a spiral.Type: GrantFiled: January 27, 2012Date of Patent: February 7, 2017Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Kenichiro Iwakiri, Isao Tomita, Takashi Shiraishi
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Patent number: 9541094Abstract: A scroll structure of a centrifugal compressor 1 having a spirally formed scroll passage 13. The scroll passage 13 includes: a flat connecting portion A at a flow passage joint 23 where a scroll start and a scroll end of the scroll passage 13 meet, this flat connecting portion having a flat cross-sectional shape with a same height as that of an outlet passage of a diffuser; and a transition part 21 where the flat cross-sectional shape of the flat connecting portion A gradually changes back to a circular cross-sectional shape along a circumferential direction.Type: GrantFiled: December 5, 2011Date of Patent: January 10, 2017Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Kenichiro Iwakiri, Isao Tomita, Motoki Ebisu, Hiroshi Suzuki, Takashi Shiraishi
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Patent number: 9494160Abstract: Provided is a centrifugal compressor impeller which is characterized in that leading edges 7a on a shroud side of splitter blades 7 are offset from a circumferentially equidistant position between full blades 5R and 5F toward a suction side Sb of the full blade 5F, and trailing edges 7b on a hub side of the splitter blades 7 are offset from a circumferentially equidistant position between the full blades toward the suction side Sb of the full blade 5F, so that a tip leakage vortex W flowing from a tip clearance between the tips of the full blades 5F and the shroud toward the leading edges 7a of the splitter blades 7 flows over the leading edges 7a of the splitter blades 7.Type: GrantFiled: December 6, 2011Date of Patent: November 15, 2016Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Isao Tomita, Toru Hoshi, Tadashi Kanzaka
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Publication number: 20160282574Abstract: In a sealing structure of optical communication module using a sealing material, it has been difficult to secure the reliability without influencing optical fiber characteristics. A sealing structure of optical communication module of the present invention comprises: a cylindrical barrel unit fixed to a package; a cylindrical flange which is disposed inside the barrel unit and through which an optical fiber pierces; and a sealing material disposed between the barrel unit and the flange, wherein the flange has on its surface a plurality of regions having different surface conditions, and the sealing material is disposed in only one of the regions.Type: ApplicationFiled: November 10, 2014Publication date: September 29, 2016Inventor: Isao TOMITA
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Publication number: 20160273388Abstract: An object is to provide a sheet-metal turbine housing reinforced by a readily-manufacturable structure, the sheet-metal turbine housing also having a small thickness and improved containment performance. A sheet-metal turbine housing includes: a scroll part forming an exhaust gas channel of a scroll shape in a turbocharger for driving a turbine with exhaust gas of an engine, the scroll part comprising sheet metal; and at least one rib portion of a protrusion shape formed on an outer wall surface of the scroll part at a radially outer side of an inlet edge of a turbine blade along a circumferential direction of the scroll part, the at least one rib portion protruding either outward or inward, or both, and including a bend and bend-back structure formed on the sheet metal forming the scroll part.Type: ApplicationFiled: December 4, 2013Publication date: September 22, 2016Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Toyotaka YOSHIDA, Takao YOKOYAMA, Isao TOMITA, Daigo WATANABE, Yasuaki JINNAI, Hirotaka HIGASHIMORI