Patents by Inventor Noriaki Ayuzawa
Noriaki Ayuzawa 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: 20240141993Abstract: An oil control ring comprises: an oil ring having a pair of land parts arranged in a sliding direction and connected to each other by a web part; and a coil expander that biases the oil ring toward the outer circumferential side in the radial direction. The web part of the oil ring is provided with a plurality of window holes. In the axial cross-sectional view of the largest opening portion of the window hole in the axial direction of the oil ring, a width H1 in the sliding direction of the oil ring and a length L1 of a combustion chamber-side non-window hole part, which excludes the window hole, in the outer circumferential surface of the web part, satisfy the condition of 0.15>L1/H1?0.Type: ApplicationFiled: March 8, 2022Publication date: May 2, 2024Inventors: Akira HIKONE, Takashi OGURO, Noriaki AYUZAWA, Toshihiro YAMAOKA, Naoki UMEDA
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Patent number: 10072755Abstract: A combination oil ring includes a pair of upper and lower side rails and a spacer expander arranged there between, the spacer expander including a plurality of upper pieces and lower pieces alternately arranged in a circumferential direction with the pieces axially and circumferentially apart from each other, a coupling piece coupling pieces adjacent to each other, and flange portions formed standing at inner circumferential-side end portions of the upper pieces and the lower pieces so as to press the side rails, and a through hole being formed in the flange portions, wherein side rail support portions that project axially are formed at portions in the circumferential direction of outer circumferential-side end portions of the upper pieces and the lower pieces.Type: GrantFiled: September 15, 2016Date of Patent: September 11, 2018Assignee: TPR CO., LTD.Inventors: Noriaki Ayuzawa, Atsushi Nakazawa, Masahide Hama, Toshiyuki Shibuya
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Patent number: 9845873Abstract: A combination oil ring includes a pair of upper and lower side rails and a spacer expander arranged there between, the spacer expander including a plurality of upper pieces and lower pieces alternately arranged in a circumferential direction with the pieces axially and circumferentially apart from each other, a coupling piece coupling pieces adjacent to each other, and flange portions formed standing at inner circumferential-side end portions of the upper pieces and the lower pieces so as to press the side rails, and a through hole being formed in the flange portions, wherein side rail support portions that project axially are formed at portions in the circumferential direction of outer circumferential-side end portions of the upper pieces and the lower pieces.Type: GrantFiled: September 15, 2016Date of Patent: December 19, 2017Assignee: TPR CO., LTD.Inventors: Noriaki Ayuzawa, Atsushi Nakazawa, Masahide Hama, Toshiyuki Shibuya
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Patent number: 9726286Abstract: A combination oil ring includes a pair of upper and lower side rails and a spacer expander arranged therebetween, the spacer expander including a plurality of upper pieces and lower pieces alternately arranged in a circumferential direction with the pieces axially and circumferentially apart from each other, a coupling piece coupling pieces adjacent to each other, and flange portions formed standing at inner circumferential-side end portions of the upper pieces and the lower pieces so as to press the side rails, and a through hole being formed in the flange portions, wherein side rail support portions that project axially are formed at portions in the circumferential direction of outer circumferential-side end portions of the upper pieces and the lower pieces.Type: GrantFiled: August 7, 2012Date of Patent: August 8, 2017Assignee: TPR CO., LTDInventors: Noriaki Ayuzawa, Atsushi Nakazawa, Masahide Hama, Toshiyuki Shibuya
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Publication number: 20170002925Abstract: A combination oil ring includes a pair of upper and lower side rails and a spacer expander arranged there between, the spacer expander including a plurality of upper pieces and lower pieces alternately arranged in a circumferential direction with the pieces axially and circumferentially apart from each other, a coupling piece coupling pieces adjacent to each other, and flange portions formed standing at inner circumferential-side end portions of the upper pieces and the lower pieces so as to press the side rails, and a through hole being formed in the flange portions, wherein side rail support portions that project axially are formed at portions in the circumferential direction of outer circumferential-side end portions of the upper pieces and the lower pieces.Type: ApplicationFiled: September 15, 2016Publication date: January 5, 2017Inventors: Noriaki AYUZAWA, Atsushi NAKAZAWA, Masahide HAMA, Toshiyuki SHIBUYA
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Publication number: 20170002926Abstract: A combination oil ring includes a pair of upper and lower side rails and a spacer expander arranged there between, the spacer expander including a plurality of upper pieces and lower pieces alternately arranged in a circumferential direction with the pieces axially and circumferentially apart from each other, a coupling piece coupling pieces adjacent to each other, and flange portions formed standing at inner circumferential-side end portions of the upper pieces and the lower pieces so as to press the side rails, and a through hole being formed in the flange portions, wherein side rail support portions that project axially are formed at portions in the circumferential direction of outer circumferential-side end portions of the upper pieces and the lower pieces.Type: ApplicationFiled: September 15, 2016Publication date: January 5, 2017Inventors: Noriaki AYUZAWA, Atsushi NAKAZAWA, Masahide HAMA, Toshiyuki SHIBUYA
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Patent number: 9458933Abstract: A combination oil ring prevented from freeze up of the side rails and spacer expander, that is, a combination oil ring of the present invention provided with a top and bottom pair of side rails 11 and 12 and a spacer expander 13 having large numbers of top pieces 14 and bottom pieces arranged separated in the axial direction and circumferential direction and alternating in the circumferential direction, connecting pieces 16 connecting adjoining top pieces 14 and bottom pieces 15, and ear parts 17 and 18 formed rising up at the inner circumference side ends of the top pieces 14 and bottom pieces 15 for pushing against the side rails 11 and 12, in which combination oil ring 10, grooves 19 and 20 are formed in at least one surfaces of top surfaces of the top pieces 14 and bottom surfaces of the bottom pieces 15, and through holes 17a and 18a by which the grooves 19 and 20 are communicated are formed in the ear parts 17 and 18.Type: GrantFiled: March 8, 2011Date of Patent: October 4, 2016Assignee: TPR Co., Ltd.Inventors: Noriaki Ayuzawa, Masahide Hama, Yutaka Kitazume
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Publication number: 20140246834Abstract: The present invention prevents anchoring between a space expander and a side rail of a combination oil ring.Type: ApplicationFiled: August 7, 2012Publication date: September 4, 2014Applicant: TPR CO., LTD.Inventors: Noriaki Ayuzawa, Atsushi Nakazawa, Masahide Hama, Toshiyuki Shibuya
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Publication number: 20110221141Abstract: A combination oil ring prevented from freeze up of the side rails and spacer expander, that is, a combination oil ring of the present invention provided with a top and bottom pair of side rails 11 and 12 and a spacer expander 13 having large numbers of top pieces 14 and bottom pieces arranged separated in the axial direction and circumferential direction and alternating in the circumferential direction, connecting pieces 16 connecting adjoining top pieces 14 and bottom pieces 15, and ear parts 17 and 18 formed rising up at the inner circumference side ends of the top pieces 14 and bottom pieces 15 for pushing against the side rails 11 and 12, in which combination oil ring 10, grooves 19 and 20 are formed in at least one surfaces of top surfaces of the top pieces 14 and bottom surfaces of the bottom pieces 15, and through holes 17a and 18a by which the grooves 19 and 20 are communicated are formed in the ear parts 17 and 18.Type: ApplicationFiled: March 8, 2011Publication date: September 15, 2011Applicant: TEIKOKU PISTON RING CO., LTD.Inventors: Noriaki Ayuzawa, Masahide Hama, Yutaka Kitazume