Patents by Inventor Yutaka Mabuchi
Yutaka Mabuchi 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).
-
Publication number: 20080167206Abstract: A low-friction sliding mechanism includes first and second sliding members having respective sliding surfaces slidable relative to each other and a lubricant applied to the sliding surfaces of the first and second sliding members. At least the sliding surface of the first sliding member is made of a diamond-like carbon material, and at least the sliding surface of the second sliding member is made of either an aluminum-based alloy material, a magnesium-based alloy material or a diamond-like carbon material. The lubricant contains a base oil and at least one of an ashless fatty-ester friction modifier and an ashless aliphatic-amine friction modifier.Type: ApplicationFiled: December 13, 2007Publication date: July 10, 2008Inventors: Shozaburo KONISHI, Makoto Kano, Yoshiteru Yasuda, Yutaka Mabuchi, Takahiro Hamada, Shigeki Takeshima, Kenji Tsushima
-
Patent number: 7322749Abstract: A low-friction sliding mechanism includes first and second sliding members having respective sliding surfaces slidable relative to each other and a lubricant applied to the sliding surfaces of the first and second sliding members. At least the sliding surface of the first sliding member is made of a diamond-like carbon material, and at least the sliding surface of the second sliding member is made of either an aluminum-based alloy material, a magnesium-based alloy material or a diamond-like carbon material. The lubricant contains a base oil and at least one of an ashless fatty-ester friction modifier and an ashless aliphatic-amine friction modifier.Type: GrantFiled: May 6, 2005Date of Patent: January 29, 2008Assignees: Nissan Motor Co., Ltd., Nippon Oil CorporationInventors: Shozaburo Konishi, Makoto Kano, Yoshiteru Yasuda, Yutaka Mabuchi, Takahiro Hamada, Shigeki Takeshima, Kenji Tsushima
-
Publication number: 20070292711Abstract: A sliding mechanism includes a contact area between at least two sliding members. A low friction coating is applied on at least a portion of one of the at least two sliding members at the contact area. The low friction coating is a hard carbon including a diamond like carbon material selected from the group consisting of diamond, amorphous a-C diamond like carbon (DLC), and amorphous a-C:H DLC. A grease is applied on the low friction coating, wherein the grease comprises a base oil selected from the group consisting of ester oils, ether oils and combinations thereof.Type: ApplicationFiled: January 5, 2006Publication date: December 20, 2007Applicant: Nissan Motor Co., Ltd.Inventors: Takafumi Ueno, Yutaka Mabuchi, Makoto Kano, Saburo Abe
-
Patent number: 7309465Abstract: A sintered sprocket for a silent chain is obtained from a material with few addition elements by a simple densifying method. The sintered sprocket is made of an ferrous material having an ovarall composition containing Cu at 1 to 2%, C at 0.5 to 0.8%, Mn as an inevitable impurity at 0.10% or less, and balance of Fe and other inevitable impurities by mass and has a density of 7.1 Mg/m3 or higher, 65 HRA or higher as a hardness in the gear teeth, and a martensite, sorbite, bainite, or their mixed structure as a cross-sectional microscopic structure in at least the gear teeth and the peripheral area of the gear teeth.Type: GrantFiled: April 5, 2006Date of Patent: December 18, 2007Assignees: Nissan Motor Co., Ltd., Hitachi Powdered Metals Co., Ltd.Inventors: Akira Fujiki, Yukihiro Maekawa, Yutaka Mabuchi, Takashi Murata, Takashi Suzuki, Jyun-ichi Yamada, Tadayuki Tsutsui, Kei Ishii
-
Patent number: 7284525Abstract: There is provided a structure for connecting a piston to a crankshaft in an internal combustion engine, including a piston pin fitted into the piston, a crankpin integral with the crankshaft and a connecting rod having a piston pin bearing portion slidably engaged with an outer cylindrical portion of the piston pin and a crankpin bearing portion slidably engaged with an outer cylindrical portion of the crankpin. At least one of the piston pin bearing portion of the connecting rod and the outer cylindrical portion of the piston pin and at least one of the crankpin bearing portion of the connecting rod and the outer cylindrical portion of the crankpin have hard carbon coatings formed thereon with a hydrogen content of 20 atomic % or less.Type: GrantFiled: August 10, 2004Date of Patent: October 23, 2007Assignee: Nissan Motor Co., Ltd.Inventors: Kimio Nishimura, Yutaka Mabuchi, Takashi Murata, Takuya Hirata, Makoto Kano, Takahiro Hamada, Masashi Yamaguchi
-
Patent number: 7273655Abstract: A slidably movable member such as an adjusting shim used in a valve operating mechanism of an internal combustion engine of an automotive vehicle. The slidably movable member is used in contact with lubricating oil and comprises a substrate. A hard carbon-based film is coated on a surface of the substrate. The hard carbon-based film has a surface section which contains at least one of nitrogen and oxygen in an amount ranging from 0.5 to 30 at % and/or hydrogen in an amount of not more than 10 at %.Type: GrantFiled: January 12, 2005Date of Patent: September 25, 2007Assignees: Nissan Motor Co., Ltd.Inventors: Shojiro Miyake, Yoshiteru Yasuda, Makoto Kano, Yutaka Mabuchi
-
Patent number: 7255083Abstract: A sliding structure for an automotive engine includes a sliding member with a sliding portion and a lubricant applied to the sliding portion so that the sliding portion can make sliding contact with a counterpart member via the lubricant. The sliding member is either of a piston ring, a piston pin, a cam lobe, a cam journal, a plain bearing, a rotary vane and a timing chain. The sliding portion has a base made of a steel or aluminum material and a hard carbon film formed on the base to coat the sliding portion. The hard carbon film has a thickness of 0.3 to 2.0 ?m, a Knoop hardness of 1500 to 4500 kg/mm2, a surface roughness Ry (?m) satisfying the following equation: Ry<{(0.75?Hk/8000)×h+0.07/0.8}, where h is the thickness (?m) of the film; and Hk is the Knoop hardness (kg/mm2) of the film.Type: GrantFiled: May 2, 2005Date of Patent: August 14, 2007Assignee: Nissan Motor Co., Ltd.Inventors: Takahiro Hamada, Yutaka Mabuchi, Makoto Kano, Yoshiteru Yasuda, Yusuke Okamoto
-
Patent number: 7228786Abstract: An engine piston-pin sliding structure includes a piston pin slidably engaged into a pin boss of an engine piston and having a base and a hard carbon coating formed on the base so as to define a sliding surface slidable over a bearing surface of the pin boss and a lubricant interposed between the sliding surface of the piston pin and the bearing surface of the pin boss. The hard carbon coating contains 25 atomic % or less of hydrogen, and the lubricant contains at least one of an ashless fatty-ester friction modifier and an ashless aliphatic-amine friction modifier.Type: GrantFiled: May 13, 2004Date of Patent: June 12, 2007Assignee: Nissan Motor Co., Ltd.Inventors: Takahiro Hamada, Yutaka Mabuchi, Makoto Kano, Hidenori Miyake
-
Patent number: 7156061Abstract: A valve lifter, in which an amorphous hard carbon film is coated at least on the surface that slides against a cam, is characterized in that the surface of a base material (substrate) has an arithmetic mean roughness of Ra 0.01 to 0.03 micrometers, and the maximum length of the scratch on the base surface is made to be equal to or shorter than 250 micrometers.Type: GrantFiled: February 1, 2006Date of Patent: January 2, 2007Assignees: Kabushiki Kaisha Riken, Nissan Motor Co., Ltd.Inventors: Takashi Matsui, Masaki Moronuki, Katsuhiro Tsuji, Yutaka Mabuchi, Takahiro Hamada, Hiroyuki Izumi, Tomoyuki Koike
-
Patent number: 7146956Abstract: A valve train for an internal combustion engine is comprised of a lubricating oil, and a camshaft which is made of an iron-based material and comprises a cam lobe and a camshaft journal. The camshaft slidingly moves on a counterpart thereof through the lubricating oil. A hard carbon film is formed on at least one of a sliding portion of the camshaft and the counterpart made of an iron-based material. A hydrogen amount of the hard carbon film is 10 atomic percent or less.Type: GrantFiled: August 6, 2004Date of Patent: December 12, 2006Assignee: Nissan Motor Co., Ltd.Inventors: Shin Nomura, Takahiro Miura, Makoto Kano, Yutaka Mabuchi, Takahiro Hamada, Miki Murakami
-
Publication number: 20060263604Abstract: The invention provides a low-friction sliding mechanism, a low-friction agent composition, a friction reduction method, a manual transmission and a final reduction gear unit that can exert very excellent low friction characteristics to sliding surfaces present under various applications, and, in particular, that have more excellent low friction characteristics than that of a combination of an existing steel material and an organic Mo compound. The low-friction sliding mechanism has an oxygen-containing organic compound or an aliphatic amine compound interposed between sliding surfaces that a DLC coated sliding member and a sliding member form. The low-friction agent composition contains an oxygen-containing organic compound or an aliphatic amine compound. The friction reduction method includes supplying the low-friction agent composition between sliding surfaces that a DLC coated sliding member and a sliding member form.Type: ApplicationFiled: August 6, 2004Publication date: November 23, 2006Inventors: Jean Martin, Shigeki Takeshima, Shozaburo Konishi, Makoto Kano, Yutaka Mabuchi, Takao Ishikawa, Takafumi Ueno, Kiyotaka Nakamura, Takahiro Hamada
-
Publication number: 20060207540Abstract: A valve lifter, in which an amorphous hard carbon film is coated at least on the surface that slides against a cam, is characterized in that the surface of a base material (substrate) has an arithmetic mean roughness of Ra 0.01 to 0.03 micrometers, and the maximum length of the scratch on the base surface is made to be equal to or shorter than 250 micrometers.Type: ApplicationFiled: February 1, 2006Publication date: September 21, 2006Inventors: Takashi Matsui, Masaki Moronuki, Katsuhiro Tsuji, Yutaka Mabuchi, Takahiro Hamada, Hiroyuki Izumi, Tomoyuki Koike
-
Patent number: 7086362Abstract: Disclosed is a shim or a valve lifter for an automotive engine valve driving system that slides against a cam lobe of a camshaft to drive an intake/exhaust valve of an internal combustion engine. The shim or lifter has the top of a sliding surface thereof opposing the cam lobe and being coated with a hard carbon film. The hard carbon film has a surface hardness of 1500 to 4500 kg/mm2 in terms of Knoop hardness, a thickness of 0.3 to 2.0 ?m and a surface roughness Ry (?m) satisfying the following equation (A): Ry<{(0.75?Hk/8000)×h+0.07/0.8}??(A) where h is the thickness (?m) of the hard carbon film; and Hk is the knoop hardness (kg/mm2) of the hard carbon film. By imparting durability, reliability and a low friction coefficient to the hard carbon film that is said to be low in ductility to prevent the hard carbon film from becoming cracked and separated when applied to the sliding portion.Type: GrantFiled: September 27, 2002Date of Patent: August 8, 2006Assignee: Nissan Motor Co., Ltd.Inventors: Yutaka Mabuchi, Yoshiteru Yasuda, Masahiko Shioda, Mototaka Ishihara, Hisanori Ohara, Kazuhiko Oda, Yoshiharu Utsumi, Miki Irie
-
Publication number: 20060171838Abstract: A sintered sprocket for a silent chain is obtained from a material with few addition elements by a simple densifying method. The sintered sprocket is made of an ferrous material having an ovarall composition containing Cu at 1 to 2%, C at 0.5 to 0.8%, Mn as an inevitable impurity at 0.10% or less, and balance of Fe and other inevitable impurities by mass and has a density of 7.1 Mg/m3 or higher, 65 HRA or higher as a hardness in the gear teeth, and a martensite, sorbite, bainite, or their mixed structure as a cross-sectional microscopic structure in at least the gear teeth and the peripheral area of the gear teeth.Type: ApplicationFiled: April 5, 2006Publication date: August 3, 2006Applicants: NISSAN MOTOR CO., LTD., HITACHI POWDERED METALS CO., LTD.Inventors: Akira Fujiki, Yukihiro Maekawa, Yutaka Mabuchi, Takashi Murata, Takashi Suzuki, Jyun-ichi Yamada, Tadayuki Tsutsui, Kei Ishii
-
Patent number: 7041149Abstract: A sintered sprocket has a high overall density and excellent contact pressure resistance. The sprocket is produced from a sintered alloy selected from the following alloys ((1) to (3)), is densified to have a relative density of 95% or higher in the surface layer of the gear teeth by forming by rolling, having a surface hardness of 700 HV or higher, and is useful for a crankshaft, a cam shaft, a balancer shaft, or a water pump shaft of an internal combustion engine: (1) an Fe—Mo—C based sintered alloy containing Mo at 1.0 to 2.0% by mass; (2) an Fe—Mo—Ni—C based sintered alloy containing Mo at more than 1.0 and not more than 2.0% by mass, and Ni at more than 1.0 and not more than 2.5% by mass, or (3) an Fe—Mo—Ni—Cu—C based sintered alloy containing Mo at 0.3 to 1.0% by mass, Ni at not less than 1.5 to less than 3.0% by mass, and Cu at 1.0 to 2.5% by mass.Type: GrantFiled: July 7, 2004Date of Patent: May 9, 2006Assignees: Nissan Motor Co., Ltd., Hitachi Powdered Metals Co., Ltd.Inventors: Akira Fujiki, Yukihiro Maekawa, Yutaka Mabuchi, Takashi Murata, Takashi Suzuki, Jyun-ichi Yamada, Tadayuki Tsutsui, Kei Ishii
-
Publication number: 20060054127Abstract: A member for an internal combustion engine, such as a piston, a valve and a fuel injection valve. The member includes a substrate. A carbon-based coating film is formed on the substrate to cover at least a part of a region of the substrate to which region fuel for the internal combustion engine is contactable. The carbon-based coating film contains fluorine and has a thickness of 10 ?m or less.Type: ApplicationFiled: September 13, 2005Publication date: March 16, 2006Inventors: Seiji Kamada, Hiroshi Kumagai, Midori Kondou, Kenji Kikuchi, Takumaru Sagawa, Yutaka Mabuchi, Takahiro Nakahigashi
-
Patent number: 6969198Abstract: A low-friction sliding mechanism includes first and second sliding members having respective sliding surfaces slidable relative to each other and a lubricant applied to the sliding surfaces of the first and second sliding members. At least the sliding surface of the first sliding member is made of a diamond-like carbon material, and at least the sliding surface of the second sliding member is made of either an aluminum-based alloy material, a magnesium-based alloy material or a diamond-like carbon material. The lubricant contains a base oil and at least one of an ashless fatty-ester friction modifier and an ashless aliphatic-amine friction modifier.Type: GrantFiled: October 27, 2003Date of Patent: November 29, 2005Assignees: Nissan Motor Co., Ltd., Nippon Oil CorporationInventors: Shozaburo Konishi, Makoto Kano, Yoshiteru Yasuda, Yutaka Mabuchi, Takahiro Hamada, Shigeki Takeshima, Kenji Tsushima
-
Publication number: 20050213854Abstract: A low-friction sliding mechanism includes first and second sliding members having respective sliding surfaces slidable relative to each other and a lubricant applied to the sliding surfaces of the first and second sliding members. At least the sliding surface of the first sliding member is made of a diamond-like carbon material, and at least the sliding surface of the second sliding member is made of either an aluminum-based alloy material, a magnesium-based alloy material or a diamond-like carbon material. The lubricant contains a base oil and at least one of an ashless fatty-ester friction modifier and an ashless aliphatic-amine friction modifier.Type: ApplicationFiled: May 6, 2005Publication date: September 29, 2005Inventors: Shozaburo Konishi, Makoto Kano, Yoshiteru Yasuda, Yutaka Mabuchi, Takahiro Hamada, Shigeki Takeshima, Kenji Tsushima
-
Publication number: 20050188942Abstract: A sliding structure for an automotive engine includes a sliding member with a sliding portion and a lubricant applied to the sliding portion so that the sliding portion can make sliding contact with a counterpart member via the lubricant. The sliding member is either of a piston ring, a piston pin, a cam lobe, a cam journal, a plain bearing, a rotary vane and a timing chain. The sliding portion has a base made of a steel or aluminum material and a hard carbon film formed on the base to coat the sliding portion. The hard carbon film has a thickness of 0.3 to 2.0 ?m, a Knoop hardness of 1500 to 4500 kg/mm2, a surface roughness Ry (?m) satisfying the following equation: Ry<{(0.75?Hk/8000)×h+0.07/0.8}, where h is the thickness (?m) of the film; and Hk is the Knoop hardness (kg/mm2) of the film.Type: ApplicationFiled: May 2, 2005Publication date: September 1, 2005Inventors: Takahiro Hamada, Yutaka Mabuchi, Makoto Kano, Yoshiteru Yasuda, Yusuke Okamoto
-
Publication number: 20050118426Abstract: A slidably movable member such as an adjusting shim used in a valve operating mechanism of an internal combustion engine of an automotive vehicle. The slidably movable member is used in contact with lubricating oil and comprises a substrate. A hard carbon-based film is coated on a surface of the substrate. The hard carbon-based film has a surface section which contains at least one of nitrogen and oxygen in an amount ranging from 0.5 to 30 at % and/or hydrogen in an amount of not more than 10 at %.Type: ApplicationFiled: January 12, 2005Publication date: June 2, 2005Inventors: Shojiro Miyake, Yoshiteru Yasuda, Makoto Kano, Yutaka Mabuchi