Patents by Inventor Hiromichi Komai
Hiromichi Komai 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: 11828334Abstract: A power transmission shaft has a shaft member having, on an outer peripheral surface thereof, a male spline; a cylindrical member having, on an inner peripheral surface thereof, a female spline; and a seal member provided in a pressed state between an outer peripheral seal surface formed on the outer peripheral surface of the shaft member and an inner peripheral seal surface formed on the inner peripheral surface of the cylindrical member. The cylindrical member is spline-engaged with the shaft member by one end side of the shaft member being inserted into the cylindrical member from an other end side of the cylindrical member. Axial direction shock is absorbed by sliding of the splines. The outer peripheral seal surface is positioned at the other end side with respect to the male spline, and the inner peripheral seal surface is positioned at the other side with respect to the female spline.Type: GrantFiled: March 11, 2022Date of Patent: November 28, 2023Assignee: HITACHI ASTEMO, LTD.Inventors: Yasushi Akita, Hiromichi Komai, Masashi Kubo
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Publication number: 20230047822Abstract: A propeller shaft (1) that is a power transmission shaft has a shaft member (2) as a tubular body made of iron-based metal and a balance weight (3) made of iron-based metal and welded to an outer peripheral surface of this shaft member (2). At least a part of the balance weight (3) of the propeller shaft (1) is covered with a sacrificial metal coating (4) made of sacrificial corrosion prevention material that contains metal whose ionization tendency is higher than that of metal forming the shaft member (2). With this, it is possible to suppress local progression of corrosion at a periphery of the balance weight (3) and improve durability of the propeller shaft (1) .Type: ApplicationFiled: October 31, 2022Publication date: February 16, 2023Applicant: HITACHI ASTEMO, LTD.Inventors: Yasutomo MABE, Kiyokazu NAKANE, Hiromichi KOMAI, Xiaojin ZHU, Toshiyuki MASUDA, Kenichiro ISHIKURA
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Patent number: 11512761Abstract: A propeller shaft (1) that is a power transmission shaft has a shaft member (2) as a tubular body made of iron-based metal and a balance weight (3) made of iron-based metal and welded to an outer peripheral surface of this shaft member (2). At least a part of the balance weight (3) of the propeller shaft (1) is covered with a sacrificial metal coating (4) made of sacrificial corrosion prevention material that contains metal whose ionization tendency is higher than that of metal forming the shaft member (2). With this, it is possible to suppress local progression of corrosion at a periphery of the balance weight (3) and improve durability of the propeller shaft (1).Type: GrantFiled: May 18, 2018Date of Patent: November 29, 2022Assignee: HITACHI ASTEMO, LTD.Inventors: Yasutomo Mabe, Kiyokazu Nakane, Hiromichi Komai, Xiaojin Zhu, Toshiyuki Masuda, Kenichiro Ishikura
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Patent number: 11493093Abstract: A propeller shaft as a power transmission shaft is provided between vehicle-side first second shaft parts, and a first tube as a first shaft member is connected to the first shaft part through a first joint member and to the second shaft part through a second joint member. The first tube is connected to the first joint member through a first collar member and to the second joint member through a second collar member. The first collar member includes a first main body part exposed from a first end portion of the first tube, and a first insertion part inserted into the inside of the first end portion. In at least the first collar member, the maximum value of the outer diameter of the first main body part is set to be no greater than the maximum value of the outer diameter of the first insertion part.Type: GrantFiled: August 28, 2018Date of Patent: November 8, 2022Assignee: HITACHI ASTEMO, LTD.Inventors: Yasutomo Mabe, Toshiyuki Masuda, Hiromichi Komai, Kenichiro Ishikura
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Publication number: 20220196078Abstract: A power transmission shaft has a shaft member having, on an outer peripheral surface thereof, a male spline; a cylindrical member having, on an inner peripheral surface thereof, a female spline; and a seal member provided in a pressed state between an outer peripheral seal surface formed on the outer peripheral surface of the shaft member and an inner peripheral seal surface formed on the inner peripheral surface of the cylindrical member. The cylindrical member is spline-engaged with the shaft member by one end side of the shaft member being inserted into the cylindrical member from an other end side of the cylindrical member. Axial direction shock is absorbed by sliding of the splines. The outer peripheral seal surface is positioned at the other end side with respect to the male spline, and the inner peripheral seal surface is positioned at the other side with respect to the female spline.Type: ApplicationFiled: March 11, 2022Publication date: June 23, 2022Applicant: HITACHI ASTEMO, LTD.Inventors: Yasushi AKITA, Hiromichi KOMAI, Masashi KUBO
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Patent number: 11339831Abstract: A power transmission shaft has a shaft member having, on an outer peripheral surface thereof, a male spline; a cylindrical member having, on an inner peripheral surface thereof, a female spline; and a seal member provided in a pressed state between an outer peripheral seal surface formed on the outer peripheral surface of the shaft member and an inner peripheral seal surface formed on the inner peripheral surface of the cylindrical member. The cylindrical member is spline-engaged with the shaft member by one end side of the shaft member being inserted into the cylindrical member from an other end side of the cylindrical member. Axial direction shock is absorbed by sliding of the splines. The outer peripheral seal surface is positioned at the other end side with respect to the male spline, and the inner peripheral seal surface is positioned at the other side with respect to the female spline.Type: GrantFiled: February 5, 2019Date of Patent: May 24, 2022Assignee: HITACHI ASTEMO, LTD.Inventors: Yasushi Akita, Hiromichi Komai, Masashi Kubo
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Patent number: 11306785Abstract: A power transmission shaft has a shaft member having, on an outer peripheral surface thereof, a male spline; a cylindrical member having, on an inner peripheral surface thereof, a female spline; and a seal member provided in a pressed state between an outer peripheral seal surface formed on the outer peripheral surface of the shaft member and an inner peripheral seal surface formed on the inner peripheral surface of the cylindrical member. The cylindrical member is spline-engaged with the shaft member by one end side of the shaft member being inserted into the cylindrical member from an other end side of the cylindrical member. Axial direction shock is absorbed by sliding of the splines. The outer peripheral seal surface is positioned at the other end side with respect to the male spline, and the inner peripheral seal surface is positioned at the other side with respect to the female spline.Type: GrantFiled: February 5, 2019Date of Patent: April 19, 2022Assignee: HITACHI ASTEMO, LTD.Inventors: Yasushi Akita, Hiromichi Komai, Masashi Kubo
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Publication number: 20200370603Abstract: A propeller shaft as a power transmission shaft is provided between vehicle-side first second shaft parts, and a first tube as a first shaft member is connected to the first shaft part through a first joint member and to the second shaft part through a second joint member. The first tube is connected to the first joint member through a first collar member and to the second joint member through a second collar member. The first collar member includes a first main body part exposed from a first end portion of the first tube, and a first insertion part inserted into the inside of the first end portion. In at least the first collar member, the maximum value of the outer diameter of the first main body part is set to be no greater than the maximum value of the outer diameter of the first insertion part.Type: ApplicationFiled: August 28, 2018Publication date: November 26, 2020Applicant: Hitachi Automotive Systems, Ltd.Inventors: Yasutomo MABE, Toshiyuki MASUDA, Hiromichi KOMAI, Kenichiro ISHIKURA
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Patent number: 10767705Abstract: In a power transmission shaft including a rear-side shaft having a male spline joint portion formed on the outer periphery of a front end of the rear-side shaft and a tubular front-side shaft having a female spline joint portion formed on the inner periphery of a rear end of the tubular front-side shaft, a seal ring is housed in a seal housing groove configured at the rear end of the tubular front-side shaft. The seal ring is interposed between an outer peripheral seal surface of the rear-side shaft and an inner peripheral surface of the seal housing groove with a compressive deformation. Additionally, the seal ring is sandwiched and retained between the inside wall surface of the seal housing groove and the inside end face of a disk-shaped retainer part of a retainer press-fitted to the rear end of the tubular front-side shaft.Type: GrantFiled: March 4, 2016Date of Patent: September 8, 2020Assignee: HITACHI AUTOMOTIVE SYSTEMS KYUSHU, LTD.Inventors: Yasushi Akita, Hiromichi Komai
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Patent number: 10690192Abstract: A propeller shaft includes a shaft part and a a first yoke having a fixing portion, a connecting portion, a first yoke portion and a first concave portion. The connecting portion is provided apart from a first concave portion in the direction of the rotation axis of the shaft part. An outside diameter of the connecting portion is greater than an outside diameter of the shaft part in a radial direction of the rotation axis of the shaft part.Type: GrantFiled: June 26, 2019Date of Patent: June 23, 2020Assignee: Hitachi Automotive Systems Hyushu, Ltd.Inventors: Kenichiro Ishikura, Hidekazu Aoki, Hiromichi Komai
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Publication number: 20200116229Abstract: A propeller shaft (1) that is a power transmission shaft has a shaft member (2) as a tubular body made of iron-based metal and a balance weight (3) made of iron-based metal and welded to an outer peripheral surface of this shaft member (2). At least a part of the balance weight (3) of the propeller shaft (1) is covered with a sacrificial metal coating (4) made of sacrificial corrosion prevention material that contains metal whose ionization tendency is higher than that of metal forming the shaft member (2). With this, it is possible to suppress local progression of corrosion at a periphery of the balance weight (3) and improve durability of the propeller shaft (1).Type: ApplicationFiled: May 18, 2018Publication date: April 16, 2020Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Yasutomo MABE, Kiyokazu NAKANE, Hiromichi KOMAI, Xiaojin ZHU, Toshiyuki MASUDA, Kenichiro ISHIKURA
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Patent number: 10508692Abstract: Apparatus, such as a propeller shaft, includes an outer circumferential portion or outer race to rotate as a unit with an internal shaft (serving as the propeller shaft), an inner circumferential member or inner race to rotate as a unit with an external shaft and a plurality of balls disposed between the outer race and inner race, for transmitting rotation therebetween. A sleeve rotating as a unit with the inner race includes an inside cavity for receiving the external shaft. The sleeve is coated with a coating formed on an inside circumferential surface.Type: GrantFiled: January 18, 2017Date of Patent: December 17, 2019Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Yasutomo Mabe, Hiromichi Komai
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Publication number: 20190316636Abstract: A propeller shaft includes a shaft part and a a first yoke having a fixing portion, a connecting portion, a first yoke portion and a first concave portion. The connecting portion is provided apart from a first concave portion in the direction of the rotation axis of the shaft part. An outside diameter of the connecting portion is greater than an outside diameter of the shaft part in a radial direction of the rotation axis of the shaft part.Type: ApplicationFiled: June 26, 2019Publication date: October 17, 2019Inventors: Kenichiro ISHIKURA, Hidekazu AOKI, Hiromichi KOMAI
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Patent number: 10378591Abstract: A propeller shaft includes a shaft part, a first yoke, a connecting portion, a first yoke portion, a first concave portion, and a second yoke having a flange and a second yoke portion. The flange has a bolt insertion hole into which a securing member is inserted, and is connected to a second shaft part of a vehicle side by the securing member. The second yoke portion is provided at the flange, and has a shape that extends in a direction of a rotation axis of the shaft part. A cruciform shaft couples the first yoke portion with the second yoke portion.Type: GrantFiled: October 20, 2017Date of Patent: August 13, 2019Assignee: Hitachi Automotive Systems Kyushu, Ltd.Inventors: Kenichiro Ishikura, Hidekazu Aoki, Hiromichi Komai
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Patent number: 10352368Abstract: The first constant-velocity joint has an inner ring member, an outer ring member housing the inner ring member, and balls, which are installed in raceway grooves formed at prescribed intervals in a circumferential direction in the outer ring member and which extend along an axial direction, for transmitting rotational torque between the inner ring member and the outer ring member. Furthermore, the constant-velocity joint is formed so that one of the inner ring member and the outer ring member connects to an attaching member installed to a vehicle side with a spline, and so that the other of them connects to a power transmission shaft. In outside wall of the outer ring member, an engagement groove is formed so as to engage with an engagement member applied to connection or release thereof in a range avoiding positions corresponding to the raceway grooves in an axial direction or a circumferential direction.Type: GrantFiled: February 6, 2015Date of Patent: July 16, 2019Assignee: Hitachi Automotive Systems, Ltd.Inventors: Kenichi Sugiyama, Yasutomo Mabe, Toshiyuki Masuda, Hiromichi Komai
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Publication number: 20190170194Abstract: A power transmission shaft has a shaft member having, on an outer peripheral surface thereof, a male spline; a cylindrical member having, on an inner peripheral surface thereof, a female spline; and a seal member provided in a pressed state between an outer peripheral seal surface formed on the outer peripheral surface of the shaft member and an inner peripheral seal surface formed on the inner peripheral surface of the cylindrical member. The cylindrical member is spline-engaged with the shaft member by one end side of the shaft member being inserted into the cylindrical member from an other end side of the cylindrical member. Axial direction shock is absorbed by sliding of the splines. The outer peripheral seal surface is positioned at the other end side with respect to the male spline, and the inner peripheral seal surface is positioned at the other side with respect to the female spline.Type: ApplicationFiled: February 5, 2019Publication date: June 6, 2019Applicant: HITACHI AUTOMOTIVE SYSTEMS KYUSHU, LTD.Inventors: Yasushi AKITA, Hiromichi KOMAI, Masashi KUBO
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Patent number: 10240641Abstract: A power transmission shaft has a shaft member having, on an outer peripheral surface thereof, a male spline; a cylindrical member having, on an inner peripheral surface thereof, a female spline; and a seal member provided in a pressed state between an outer peripheral seal surface formed on the outer peripheral surface of the shaft member and an inner peripheral seal surface formed on the inner peripheral surface of the cylindrical member. The cylindrical member is spline-engaged with the shaft member by one end side of the shaft member being inserted into the cylindrical member from an other end side of the cylindrical member. Axial direction shock is absorbed by sliding of the splines. The outer peripheral seal surface is positioned at the other end side with respect to the male spline, and the inner peripheral seal surface is positioned at the other side with respect to the female spline.Type: GrantFiled: August 14, 2015Date of Patent: March 26, 2019Assignee: HITACHI AUTOMOTIVE SYSTEMS KYUSHU, LTD.Inventors: Yasushi Akita, Hiromichi Komai, Masashi Kubo
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Publication number: 20180231062Abstract: A power transmission device includes: a coupling member including an insertion hole, and having an axial elastic force; a connection member which includes a connection hole, and which is connected to the coupling member by a bolt inserted through the connection hole and the insertion hole; a sleeve member which is disposed within the connection hole and the insertion hole, and within which the bolt is inserted; and a ring member disposed within the connection hole, including an outer circumference surface abutted on an inner circumference surface of the connection hole, and including a through hole through which the sleeve member is inserted to penetrate.Type: ApplicationFiled: July 1, 2016Publication date: August 16, 2018Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Daiki TSUTSUMI, Toshiyuki MASUDA, Hiromichi KOMAI
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Publication number: 20180038418Abstract: A propeller shaft has a first yoke having a fixing portion, a pair of first bifurcated yoke portions extending from one end portion of the fixing portion in an axial direction, and a first bearing hole formed at each first yoke portion and securing therein a first bearing that holds a cruciform shaft; a second yoke coupled to the first yoke through the cruciform shaft and secured to a predetermined member, and having a mounting flange, and a bolt insertion hole which is formed at the mounting flange and into which a bolt to secure the second yoke to the predetermined member is inserted; and a securing member securing the mounting flange of the second yoke to the predetermined member through the bolt by a fastening tool. Each first yoke portion is provided with a first concave portion that slides thereon an outer circumferential surface of the fastening tool.Type: ApplicationFiled: October 20, 2017Publication date: February 8, 2018Inventors: Kenichiro ISHIKURA, Hidekazu AOKI, Hiromichi KOMAI
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Patent number: 9850959Abstract: A propeller shaft has a first yoke having a fixing portion, a pair of first bifurcated yoke portions extending from one end portion of the fixing portion in an axial direction, and a first bearing hole formed at each first yoke portion and securing therein a first bearing that holds a cruciform shaft; a second yoke coupled to the first yoke through the cruciform shaft and secured to a predetermined member, and having a mounting flange, and a bolt insertion hole which is formed at the mounting flange and into which a bolt to secure the second yoke to the predetermined member is inserted; and a securing member securing the mounting flange of the second yoke to the predetermined member through the bolt by a fastening tool. Each first yoke portion is provided with a first concave portion that slides thereon an outer circumferential surface of the fastening tool.Type: GrantFiled: January 24, 2017Date of Patent: December 26, 2017Assignee: Hitachi Automotive Systems Kyushu, Ltd.Inventors: Kenichiro Ishikura, Hidekazu Aoki, Hiromichi Komai