Patents by Inventor Hideshi Hitosugi

Hideshi Hitosugi 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).

  • Patent number: 10724636
    Abstract: Provided is a combined oil ring that further reduces engine oil consumption. A combined oil ring attached to an oil ring groove of a piston includes: a pair of upper and lower side rails each formed into a flat annular shape, and having a slide contact part that comes into sliding contact with a cylinder; and a spacer expander arranged between the pair of upper and lower side rails. In at least the upper side rail of the pair of upper and lower side rails, a cross-sectional shape of the slide contact part along an axial direction of the piston is a tapered shape linearly spreading from upper to lower parts of the piston; the tapered shape is at an angle of 5 to 30 degrees with respect to a central axis of the spacer expander, and has a vertex of the tapered shape within 0.15 mm from a lower end of the side rail; and a part closer to the lower end than the vertex is formed into a curved shape having a curvature of R0.01 to 0.5.
    Type: Grant
    Filed: July 22, 2015
    Date of Patent: July 28, 2020
    Assignee: NIPPON PISTON RING CO., LTD.
    Inventors: Masataka Kawasaki, Mamoru Miyamoto, Hideshi Hitosugi, Kenji Arai
  • Patent number: 10520085
    Abstract: A combined oil ring in which carbon sludge and the like are not deposited between side rails and a spacer expander even if an internal combustion engine is operated for a long period of time. The combined oil ring includes an outer circumferential end portion of a space forming part and a continuous part that are closed and not open toward the outer circumferential side, thereby reducing carbon sludge deposits.
    Type: Grant
    Filed: March 31, 2016
    Date of Patent: December 31, 2019
    Assignee: NIPPON PISTON RING CO., LTD.
    Inventors: Yasuyuki Murata, Kenji Arai, Ryosuke Kamata, Hideshi Hitosugi, Kazumoto Takahashi, Toru Tsukui
  • Publication number: 20180051806
    Abstract: A combined oil ring in which carbon sludge and the like are not deposited between side rails and a spacer expander even if an internal combustion engine is operated for a long period of time. The combined oil ring includes an outer circumferential end portion of a space forming part and a continuous part that are closed and not open toward the outer circumferential side, thereby reducing carbon sludge deposits.
    Type: Application
    Filed: March 31, 2016
    Publication date: February 22, 2018
    Applicant: NIPPON PISTON RING CO., LTD
    Inventors: Yasuyuki MURATA, Kenji ARAI, Ryosuke KAMATA, Hideshi HITOSUGI, Kazutomo TAKAHASHI, Toru TSUKUI
  • Publication number: 20170227126
    Abstract: Provided is a combined oil ring that further reduces engine oil consumption. A combined oil ring attached to an oil ring groove of a piston includes: a pair of upper and lower side rails each formed into a flat annular shape, and having a slide contact part that comes into sliding contact with a cylinder; and a spacer expander arranged between the pair of upper and lower side rails. In at least the upper side rail of the pair of upper and lower side rails, a cross-sectional shape of the slide contact part along an axial direction of the piston is a tapered shape linearly spreading from upper to lower parts of the piston; the tapered shape is at an angle of 5 to 30 degrees with respect to a central axis of the spacer expander, and has a vertex of the tapered shape within 0.15 mm from a lower end of the side rail; and a part closer to the lower end than the vertex is formed into a curved shape having a curvature of R0.01 to 0.5.
    Type: Application
    Filed: July 22, 2015
    Publication date: August 10, 2017
    Applicant: NIPPON PISTON RING CO., LTD.
    Inventors: Masataka KAWASAKI, Mamoru MIYAMOTO, Hideshi HITOSUGI, Kenji ARAI
  • Patent number: 9528606
    Abstract: A combined oil ring that reduces deposits between side rails and a spacer expander there between. The spacer expander includes: upper pieces and lower pieces that are alternately arranged in a circumferential direction to be spaced apart in an axial direction and the circumferential direction; coupling pieces that respectively couple the adjacent upper and lower pieces; and ear parts that erect in an inner circumferential end portion of the upper and lower pieces and push the side rails. At least one of an upper surface of each upper piece and a lower surface of each lower piece has a groove formed thereon. Ear parts have a through-hole with which the groove is communicated and a distance along the axial direction between an upper or lower surface of each ear part at a top thereof and a deepest portion of the groove is at least 0.22 mm.
    Type: Grant
    Filed: August 28, 2013
    Date of Patent: December 27, 2016
    Assignee: NIPPON PISTON RING CO., LTD
    Inventors: Hideshi Hitosugi, Kenji Arai, Kazutomo Takahashi
  • Publication number: 20140062030
    Abstract: A combined oil ring that reduces deposits between side rails and a spacer expander there between. The spacer expander includes: upper pieces and lower pieces that are alternately arranged in a circumferential direction to be spaced apart in an axial direction and the circumferential direction; coupling pieces that respectively couple the adjacent upper and lower pieces; and ear parts that erect in an inner circumferential end portion of the upper and lower pieces and push the side rails. At least one of an upper surface of each upper piece and a lower surface of each lower piece has a groove formed thereon. Ear parts have a through-hole with which the groove is communicated and a distance along the axial direction between an upper or lower surface of each ear part at a top thereof and a deepest portion of the groove is at least 0.22 mm.
    Type: Application
    Filed: August 28, 2013
    Publication date: March 6, 2014
    Applicant: NIPPON PISTON RING CO., LTD
    Inventors: Hideshi HITOSUGI, Kenji ARAI, Kazutomo TAKAHASHI
  • Patent number: 8240676
    Abstract: There is provided a piston ring which can effectively prevent aluminum adhesion phenomenon to the piston ring. The piston ring includes a piston ring main body and a surface coating film on either upper or lower surface of the piston ring main body, or both the upper and lower surfaces of the piston ring. The surface coating film includes heat-resistant resin and copper based powder contained therein.
    Type: Grant
    Filed: February 27, 2007
    Date of Patent: August 14, 2012
    Assignees: Nippon Piston Ring Co., Ltd., STT Inc.
    Inventors: Tomotaka Kariya, Hideshi Hitosugi, Makoto Tsuruta
  • Publication number: 20120061920
    Abstract: An oil ring mechanism of a piston includes a circumferential ring groove formed in an outer peripheral surface of the piston, and a two-piece oil ring having a ring-shaped ring main body that is arranged in the ring groove and urged in the outer peripheral direction inside the ring groove by a coil expander arranged on the inner peripheral side of the oil ring main body. On lower side surface on a crankcase side of a side wall surface of the ring groove that is on the opposite side of the ring groove from an engine combustion chamber, first and second recessed portions that reduce the abutment area where a lower surface of the ring main body abuts against the lower side surface formed in a lower side abutment surface that serves as a surface for abutting against the lower surface of the ring main body.
    Type: Application
    Filed: March 30, 2010
    Publication date: March 15, 2012
    Applicants: NIPPON PISTON RING CO., LTD., TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hiroyuki Nishiura, Naoya Okada, Kenji Hayama, Youhei Hashimoto, Hideshi Hitosugi, Ryosuke Naka
  • Publication number: 20090058014
    Abstract: There is provided a piston ring which can effectively prevent aluminum adhesion phenomenon to the piston ring. The piston ring includes a piston ring main body and a surface coating film on either upper or lower surface of the piston ring main body, or both the upper and lower surfaces of the piston ring. The surface coating film includes heat-resistant resin and copper based powder contained therein.
    Type: Application
    Filed: February 27, 2007
    Publication date: March 5, 2009
    Applicants: NIPPON PISTON RING CO., LTD., STT INC.
    Inventors: Tomotaka Kariya, Hideshi Hitosugi, Makoto Tsuruta
  • Patent number: 7354045
    Abstract: It is a main object of the present invention to provide an oil ring which is capable of reducing sliding friction even in a high speed revolution region of a piston, and capable of reducing the consumption of oil.
    Type: Grant
    Filed: October 28, 2003
    Date of Patent: April 8, 2008
    Assignees: Toyota Jidosha Kabushiki Kaisha, Nippon Piston Ring Co., Ltd.
    Inventors: Tomoaki Abe, Keishi Nanno, Shiro Shibata, Hideshi Hitosugi
  • Publication number: 20070261658
    Abstract: A piston for an internal-combustion engine includes a through-hole communicating with the inner space of the piston formed in an oil-ring groove into which an oil ring is fitted and a through-hole connected with a second-ring groove, the through-hole having an opening spreading from the lower portion of the bottom of the second-ring groove in a top-to-bottom direction of the piston to the lower surface of the second-ring groove and linearly extending to the inner space of the piston; and a combination of the piston and piston rings of the three-ring type for an internal-combustion engine, the end gaps of compression rings among the piston rings being set in a predetermined range.
    Type: Application
    Filed: November 22, 2005
    Publication date: November 15, 2007
    Applicant: Nippon Piston Ring Co., Ltd.
    Inventors: Tomoaki Abe, Hideshi Hitosugi
  • Publication number: 20060006604
    Abstract: It is a main object of the present invention to provide an oil ring which is capable of reducing sliding friction even in a high speed revolution region of a piston, and capable of reducing the consumption of oil.
    Type: Application
    Filed: October 28, 2003
    Publication date: January 12, 2006
    Inventors: Tomoaki Abe, Keishi Nanno, Shiro Shibata, Hideshi Hitosugi
  • Patent number: 6726218
    Abstract: A compression piston ring capable of reducing excessive surface pressure at a gap and adjacent portion thereto during engine operation, and capable of being produced at a low cost. The compression piston ring has generally circular shape without any notched portion. The compression piston ring has a dimensional requirements in that d1/a1 ranges from 40 to 60, and d1/h1 ranges from 30 to 55, in which d1 represents an inner diameter of the piston ring, a1 represents a radial length between inner and outer peripheral surfaces of the piston ring, and h1 represents an axial length of the outer peripheral surface. The compression piston ring is particularly available as a first compression piston ring for a supercharging type diesel engine providing high engine pressure.
    Type: Grant
    Filed: October 4, 2001
    Date of Patent: April 27, 2004
    Assignee: Nippon Piston Ring Co., Ltd.
    Inventors: Hideo Negishi, Hideshi Hitosugi, Hideyo Iwama
  • Patent number: 6682078
    Abstract: A ring groove for a two-piece oil ring of a piston is provided that has ring body equipped with a coil expander, wherein the ring body has an upper outer surface and a lower outer surface, both orthogonal to the axial direction of the piston. The ring groove also has an upper inner surface and a lower inner surface, both orthogonal to the axial direction of the piston; a radially inward-most, bottom surface connecting the upper and lower inner surfaces; and oil drain holes, each having an opening thereof located on the bottom surface. The ring groove has an axial width slightly greater than the width of the two-piece oil ring.
    Type: Grant
    Filed: July 12, 2002
    Date of Patent: January 27, 2004
    Assignees: Nippon Piston Ring Co., Ltd., Toyota Jidosha Kabushiki Kaisha
    Inventors: Hideshi Hitosugi, Nobuyuki Murakami, Taro Itoh
  • Patent number: 6547251
    Abstract: A ring groove for a two-piece oil ring of a piston is provided that has ring body equipped with a coil expander, wherein the ring body has an upper outer surface and a lower outer surface, both orthogonal to the axial direction of the piston. The ring groove also has an upper inner surface and a lower inner surface, both orthogonal to the axial direction of the piston; a radially inward-most, bottom surface connecting the upper and lower inner surfaces; and oil drain holes, each having an opening thereof located on the bottom surface. The ring groove has an axial width slightly greater than the width of the two-piece oil ring.
    Type: Grant
    Filed: March 27, 2000
    Date of Patent: April 15, 2003
    Assignees: Nippon Piston Ring Co., Ltd., Toyota Jidosha Kabushiki Kaisha
    Inventors: Hideshi Hitosugi, Nobuyuki Murakami, Taro Itoh
  • Publication number: 20020174768
    Abstract: According to an embodiment of the present invention, a ring groove 11 for a two-piece oil ring 10, of a piston 20, is provided that has a ring body 5 equipped with a coil expander 6, where the ring body 5 has an upper outer surface and a lower outer surface, both orthogonal to the axial direction of the piston 20. The ring groove 11 has an upper inner surface 13 and a lower inner surface 14, both orthogonal to the axial direction of the piston 20; a radially inward-most, bottom surface 12 connecting the upper and lower inner surfaces 13, 14; and oil drain holes 18 each having an opening 19 thereof located on the bottom surface 12. The ring groove 11 has an axial width slightly greater than the width of the two-piece oil ring 10.
    Type: Application
    Filed: July 12, 2002
    Publication date: November 28, 2002
    Applicant: Nippon Piston Ring
    Inventors: Hideshi Hitosugi, Nobuyuki Murakami, Taro Itoh
  • Publication number: 20020074733
    Abstract: A compression piston ring capable of reducing excessive surface pressure at a gap and adjacent portion thereto during engine operation, and capable of being produced at a low cost. The compression piston ring has generally circular shape without any notched portion. The compression piston ring has a dimensional requirements in that d1/a1 ranges from 40 to 60, and d1/h1 ranges from 30 to 55, in which d1 represents an inner diameter of the piston ring, a1 represents a radial length between inner and outer peripheral surfaces of the piston ring, and h1 represents an axial length of the outer peripheral surface. The compression piston ring is particularly available as a first compression piston ring for a supercharging type diesel engine providing high engine pressure.
    Type: Application
    Filed: October 4, 2001
    Publication date: June 20, 2002
    Applicant: NIPPON PISTON RING CO., LTD
    Inventors: Hideo Negishi, Hideshi Hitosugi, Hideyo Iwama