Patents by Inventor Junji Murata
Junji Murata 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: 11248656Abstract: A cage and roller assembly includes a plurality of rollers to be brought into rolling contact with a raceway surface provided on the outer periphery of a shaft, and an annular cage that retains the rollers. Lubricating oil is supplied through an oil supply hole that is provided inside the shaft and is open at the raceway surface. The cage includes a pair of annular portions, and a plurality of cage bars that couple the annular portions together and are arranged with intervals in a circumferential direction. The rollers are housed in pockets each formed between the pair of annular portions and between the cage bars that are adjacent to each other in the circumferential direction. The cage has an inner recessed groove that is provided on a radially inner surface of the cage bar and extends through the annular portions in an axial direction.Type: GrantFiled: July 28, 2020Date of Patent: February 15, 2022Assignee: JTEKT CORPORATIONInventors: Junji Murata, Shigeo Kamamoto, Yuki Shishihara
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Patent number: 11199226Abstract: A rolling bearing includes a first raceway surface; a second raceway surface; and a plurality of rolling elements rotatably arranged between the first raceway surface and the second raceway surface. Multiple recesses are provided on at least one surface among the first raceway surface, the second raceway surface, and rolling surfaces of the plurality of the rolling elements. An area ratio of openings of the recesses to the at least one surface is in a range of 5% to 37%. An equivalent circle diameter of the opening of each of the recesses is in a range of 1 ?m to 27 ?m. A depth of each of the recesses in a direction normal to the at least one surface is in a range of 3 ?m to 10 ?m. A surface waviness of the at least one surface excluding the recesses is smaller than or equal to 0.2 ?m.Type: GrantFiled: April 23, 2020Date of Patent: December 14, 2021Assignee: JTEKT CORPORATIONInventors: Junji Murata, Shigeo Kamamoto, Yuki Shishihara
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Patent number: 11149787Abstract: A thrust roller bearing includes a plurality of rollers and a cage including a plurality of cage pockets for housing the rollers. The rollers each include a cylindrical portion, an outer crowning portion, and an inner crowning portion. The cage pockets each include an outer surface, an inner surface facing a second end surface of the roller, and a pair of side surfaces facing an outer peripheral surface of the roller. The side surfaces each include a recessed surface that is not contactable with the roller, and flat surfaces that are provided on the outer side in the radial direction and on the inner side in the radial direction, respectively, and are contactable with the roller. A first dimension is larger than a second dimension.Type: GrantFiled: February 13, 2020Date of Patent: October 19, 2021Assignee: JTEKT CORPORATIONInventors: Yuki Shishihara, Shigeo Kamamoto, Junji Murata
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Patent number: 10948012Abstract: A thrust roller bearing includes a plurality of rollers and a cage. Each cage pocket includes a first side surface, and a second side surface. The roller and the cage are configured to satisfy the following expression (1). (Y1+Y2)/X<tan(3×?/180)??(1) Y1 represents a clearance, before skewing, between a first contact point of the roller at which the roller contacts the first side surface when the roller is skewed toward one side and the first side surface, Y2 represents a clearance, before skewing, between a second contact point of the roller at which the roller contacts the second side surface when the roller is skewed toward the one side and the second side surface, and X represents a difference between the radius of a first imaginary circle passing through the first contact point and the radius of a second imaginary circle passing through the second contact point.Type: GrantFiled: February 14, 2020Date of Patent: March 16, 2021Assignee: JTEKT CORPORATIONInventors: Yuki Shishihara, Shigeo Kamamoto, Junji Murata
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Patent number: 10916455Abstract: A flattening method, by utilizing the advantages of the CARE method and making up for the disadvantages, can perform removal processing of a surface of a workpiece at a sufficient processing rate and can provide a processed surface having enhanced flatness without leaving damage in the processed surface. A flattening method comprises at least two surface removal steps and at least two cleaning steps, the final surface removal step being a catalyst-referred etching step comprising immersing a workpiece in a processing solution containing at least one of hydrohalic acid, hydrogen peroxide water and ozone water, and bringing a surface of a catalyst platen into contact with or close proximity to a surface to be processed of the workpiece to process the surface, said catalyst platen having in a surface a catalyst selected from the group consisting of platinum, gold, a ceramic solid catalyst, a transition metal, glass, and an acidic or basic solid catalyst.Type: GrantFiled: April 1, 2019Date of Patent: February 9, 2021Assignee: EBARA CORPORATIONInventors: Kazuto Yamauchi, Yasuhisa Sano, Hideyuki Hara, Junji Murata, Keita Yagi
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Patent number: 10871193Abstract: A needle roller thrust bearing includes an annular cage and a plurality of rollers. The cage includes a plurality of cage pockets that is radially disposed. The plurality of rollers is housed in the cage pockets and disposed between a first raceway surface and a second raceway surface that axially face each other. Lubricating oil flows from a radially inner side to a radially outer side in an annular space in which the cage and the rollers are provided. The cage includes inner grooves and drainage grooves. Each of the inner grooves connects a circumferentially adjacent pair of the cage pockets by connecting radially inner areas of the pair of cage pockets. Each of the drainage grooves has an opening at an outer circumferential surface of the cage to drain lubricating oil in a circumferential area including radially outer areas of the cage pockets.Type: GrantFiled: May 30, 2019Date of Patent: December 22, 2020Assignee: JTEKT CORPORATIONInventors: Yuki Shishihara, Shigeo Kamamoto, Junji Murata
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Publication number: 20200355223Abstract: A cage and roller assembly includes a plurality of rollers to be brought into rolling contact with a raceway surface provided on the outer periphery of a shaft, and an annular cage that retains the rollers. Lubricating oil is supplied through an oil supply hole that is provided inside the shaft and is open at the raceway surface. The cage includes a pair of annular portions, and a plurality of cage bars that couple the annular portions together and are arranged with intervals in a circumferential direction. The rollers are housed in pockets each formed between the pair of annular portions and between the cage bars that are adjacent to each other in the circumferential direction. The cage has an inner recessed groove that is provided on a radially inner surface of the cage bar and extends through the annular portions in an axial direction.Type: ApplicationFiled: July 28, 2020Publication date: November 12, 2020Applicant: JTEKT CORPORATIONInventors: Junji MURATA, Shigeo KAMAMOTO, Yuki SHISHIHARA
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Publication number: 20200340532Abstract: A rolling bearing includes a first raceway surface; a second raceway surface; and a plurality of rolling elements rotatably arranged between the first raceway surface and the second raceway surface. Multiple recesses are provided on at least one surface among the first raceway surface, the second raceway surface, and rolling surfaces of the plurality of the rolling elements. An area ratio of openings of the recesses to the at least one surface is in a range of 5% to 37%. An equivalent circle diameter of the opening of each of the recesses is in a range of 1 ?m to 27 ?m. A depth of each of the recesses in a direction normal to the at least one surface is in a range of 3 ?m to 10 ?m. A surface waviness of the at least one surface excluding the recesses is smaller than or equal to 0.2 ?m.Type: ApplicationFiled: April 23, 2020Publication date: October 29, 2020Applicant: JTEKT CORPORATIONInventors: Junji MURATA, Shigeo KAMAMOTO, Yuki SHISHIHARA
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Patent number: 10767701Abstract: A cage and roller assembly includes a plurality of rollers to be brought into rolling contact with a raceway surface provided on the outer periphery of a shaft, and an annular cage that retains the rollers. Lubricating oil is supplied through an oil supply hole that is provided inside the shaft and is open at the raceway surface. The cage includes a pair of annular portions, and a plurality of cage bars that couple the annular portions together and are arranged with intervals in a circumferential direction. The rollers are housed in pockets each formed between the pair of annular portions and between the cage bars that are adjacent to each other in the circumferential direction. The cage has an inner recessed groove that is provided on a radially inner surface of the cage bar and extends through the annular portions in an axial direction.Type: GrantFiled: March 20, 2019Date of Patent: September 8, 2020Assignee: JTEKT CORPORATIONInventors: Junji Murata, Shigeo Kamamoto, Yuki Shishihara
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Publication number: 20200271156Abstract: A thrust roller bearing includes a plurality of rollers and a cage. Each cage pocket includes a first side surface, and a second side surface. The roller and the cage are configured to satisfy the following expression (1). (Y1+Y2)/X<tan(3×?/180)??(1) Y1 represents a clearance, before skewing, between a first contact point of the roller at which the roller contacts the first side surface when the roller is skewed toward one side and the first side surface, Y2 represents a clearance, before skewing, between a second contact point of the roller at which the roller contacts the second side surface when the roller is skewed toward the one side and the second side surface, and X represents a difference between the radius of a first imaginary circle passing through the first contact point and the radius of a second imaginary circle passing through the second contact point.Type: ApplicationFiled: February 14, 2020Publication date: August 27, 2020Applicant: JTEKT CORPORATIONInventors: Yuki SHISHIHARA, Shigeo KAMAMOTO, Junji MURATA
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Publication number: 20200271161Abstract: A thrust roller bearing includes a plurality of rollers and a cage including a plurality of cage pockets for housing the rollers. The rollers each include a cylindrical portion, an outer crowning portion, and an inner crowning portion. The cage pockets each include an outer surface, an inner surface facing a second end surface of the roller, and a pair of side surfaces facing an outer peripheral surface of the roller. The side surfaces each include a recessed surface that is not contactable with the roller, and flat surfaces that are provided on the outer side in the radial direction and on the inner side in the radial direction, respectively, and are contactable with the roller. A first dimension is larger than a second dimension.Type: ApplicationFiled: February 13, 2020Publication date: August 27, 2020Applicant: JTEKT CORPORATIONInventors: Yuki SHISHIHARA, Shigeo KAMAMOTO, Junji MURATA
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Patent number: 10655678Abstract: A cage and roller assembly includes rollers and an annular cage. The cage includes annular portions having guide surfaces and cage bars that couple the annular portions together. Each of the cage bars includes a cage bar body provided in an axial center portion of the cage bar and having an oil reservoir bottom face on a radially outer side of the cage bar body, the oil reservoir bottom face located on a radially inner side with respect to the guide surface, and a detachment preventing portion provided at both axial ends of the cage bar body and having an outer claw that covers a part of the roller from the radially outer side. The detachment preventing portion is provided with an outer recessed groove configured as a passage for causing lubricating oil to flow toward the guide surface from the oil reservoir bottom face through the detachment preventing portion.Type: GrantFiled: March 20, 2019Date of Patent: May 19, 2020Assignee: JTEKT CORPORATIONInventors: Junji Murata, Shigeo Kamamoto, Yuki Shishihara
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Patent number: 10634191Abstract: A cage and roller assembly includes rollers to be brought into rolling contact with a raceway surface provided on the outer periphery of a shaft, and an annular cage that retains the rollers. Lubricating oil is supplied through an oil supply hole that is provided inside the shaft and is open at an axial center region of the raceway surface. The cage includes annular portions having guide surfaces that are brought into contact with an inner peripheral surface of an outer member that is brought into rolling contact with the rollers, and cage bars that couple the annular portions together and are arranged with intervals in a circumferential direction. Clearances formed between the cage bars and the rollers housed in the pockets are larger in axial center portions of the cage bars between axial ends of the cage bars than at the axial ends of the cage bars.Type: GrantFiled: March 20, 2019Date of Patent: April 28, 2020Assignee: JTEKT CORPORATIONInventors: Junji Murata, Shigeo Kamamoto, Yuki Shishihara
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Patent number: 10584743Abstract: A bearing includes a cage and rollers disposed between a first raceway surface and a second raceway surface axially facing each other. The cage includes a first guide surface and a second guide surface. The first guide surface is provided on a radially outer portion of the cage, and contacts the first raceway surface when the cage is displaced toward the first raceway surface. A clearance formed between the first guide surface and the first raceway surface is smaller than a clearance at a radially inner portion of the cage. The second guide surface is provided on a radially outer portion of the cage, and contacts the second raceway surface when the cage is displaced toward the second raceway surface. A clearance formed between the second guide surface and the second raceway surface is smaller than a clearance at a radially inner portion of the cage.Type: GrantFiled: May 30, 2019Date of Patent: March 10, 2020Assignee: JTEKT CORPORATIONInventors: Yuki Shishihara, Shigeo Kamamoto, Junji Murata
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Patent number: 10539184Abstract: A taper roller bearing includes: an inner ring, an outer ring, a plurality of taper rollers, and an annular cage. The cage includes a small-diameter annular portion on one axial side, a large-diameter annular portion on the other axial side, and a plurality of column portions. A radial inner surface of the column portion is provided along a second virtual taper surface that is in the vicinity of a first virtual taper surface including a center line of the plurality of taper rollers, across the entire length in the longitudinal direction of the column portion.Type: GrantFiled: October 23, 2015Date of Patent: January 21, 2020Assignee: JTEKT CORPORATIONInventors: Shigeo Kamamoto, Junji Murata, Yuki Shishihara
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Patent number: 10520027Abstract: A tapered roller bearing includes an inner ring, an outer ring, a plurality of tapered rollers, and an annular cage that holds the tapered rollers. The cage has a small annular portion positioned toward the axially first side with respect to the tapered rollers, a large annular portion positioned toward the axially second side with respect to the tapered rollers, and a plurality of cage bars that couples the small annular portion and the large annular portion together, and the cage is enabled to come into contact with an inner peripheral surface of the outer ring so that the contact allows the cage to be positioned in a radial direction. The small annular portion is provided with introduction channels through which lubricant is enabled to be introduced from a bearing exterior on the axially first side into an annular space formed between the inner and outer rings.Type: GrantFiled: June 23, 2017Date of Patent: December 31, 2019Assignee: JTEKT CORPORATIONInventors: Shigeo Kamamoto, Junji Murata, Yuki Shishihara, Seiji Nakahama
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Publication number: 20190368542Abstract: A bearing includes a cage and rollers disposed between a first raceway surface and a second raceway surface axially facing each other. The cage includes a first guide surface and a second guide surface. The first guide surface is provided on a radially outer portion of the cage, and contacts the first raceway surface when the cage is displaced toward the first raceway surface. A clearance formed between the first guide surface and the first raceway surface is smaller than a clearance at a radially inner portion of the cage. The second guide surface is provided on a radially outer portion of the cage, and contacts the second raceway surface when the cage is displaced toward the second raceway surface. A clearance formed between the second guide surface and the second raceway surface is smaller than a clearance at a radially inner portion of the cage.Type: ApplicationFiled: May 30, 2019Publication date: December 5, 2019Applicant: JTEKT CORPORATIONInventors: Yuki SHISHIHARA, Shigeo KAMAMOTO, Junji MURATA
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Publication number: 20190368546Abstract: A needle roller thrust bearing includes an annular cage and a plurality of rollers. The cage includes a plurality of cage pockets that is radially disposed. The plurality of rollers is housed in the cage pockets and disposed between a first raceway surface and a second raceway surface that axially face each other. Lubricating oil flows from a radially inner side to a radially outer side in an annular space in which the cage and the rollers are provided. The cage includes inner grooves and drainage grooves. Each of the inner grooves connects a circumferentially adjacent pair of the cage pockets by connecting radially inner areas of the pair of cage pockets. Each of the drainage grooves has an opening at an outer circumferential surface of the cage to drain lubricating oil in a circumferential area including radially outer areas of the cage pockets.Type: ApplicationFiled: May 30, 2019Publication date: December 5, 2019Applicant: JTEKT CORPORATIONInventors: Yuki SHISHIHARA, Shigeo KAMAMOTO, Junji MURATA
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Publication number: 20190301533Abstract: A cage and roller assembly includes rollers and an annular cage. The cage includes annular portions having guide surfaces and cage bars that couple the annular portions together. Each of the cage bars includes a cage bar body provided in an axial center portion of the cage bar and having an oil reservoir bottom face on a radially outer side of the cage bar body, the oil reservoir bottom face located on a radially inner side with respect to the guide surface, and a detachment preventing portion provided at both axial ends of the cage bar body and having an outer claw that covers a part of the roller from the radially outer side. The detachment preventing portion is provided with an outer recessed groove configured as a passage for causing lubricating oil to flow toward the guide surface from the oil reservoir bottom face through the detachment preventing portion.Type: ApplicationFiled: March 20, 2019Publication date: October 3, 2019Applicant: JTEKT CORPORATIONInventors: Junji MURATA, Shigeo KAMAMOTO, Yuki SHISHIHARA
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Publication number: 20190301531Abstract: A cage and roller assembly includes a plurality of rollers to be brought into rolling contact with a raceway surface provided on the outer periphery of a shaft, and an annular cage that retains the rollers. Lubricating oil is supplied through an oil supply hole that is provided inside the shaft and is open at the raceway surface. The cage includes a pair of annular portions, and a plurality of cage bars that couple the annular portions together and are arranged with intervals in a circumferential direction. The rollers are housed in pockets each formed between the pair of annular portions and between the cage bars that are adjacent to each other in the circumferential direction. The cage has an inner recessed groove that is provided on a radially inner surface of the cage bar and extends through the annular portions in an axial direction.Type: ApplicationFiled: March 20, 2019Publication date: October 3, 2019Applicant: JTEKT CORPORATIONInventors: Junji MURATA, Shigeo KAMAMOTO, Yuki SHISHIHARA