Patents by Inventor Tatsuro KOGA
Tatsuro KOGA 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: 10907599Abstract: In a high-pressure pump, a relief valve seating surrounds an opening of a relief valve passage of a valve seat main body in a first space, A relief valve member includes a relief valve main body and a relief valve seat portion. The relief valve main body has a rod shape. The relief valve seat portion is integrated with an end of the relief valve main body so as to be capable of contacting the relief valve seat. The relief valve urging member urges the relief valve member toward the relief valve seat. A support portion includes a support main body that slidably supports an outer wall of the relief valve main body so as to guide a reciprocating movement of the relief valve member in the axial direction.Type: GrantFiled: November 25, 2019Date of Patent: February 2, 2021Assignee: DENSO CORPORATIONInventors: Tatsuro Koga, Noriya Matsumoto
-
Publication number: 20200088147Abstract: In a high-pressure pump, a relief valve seating surrounds an opening of a relief valve passage of a valve seat main body in a first space, A relief valve member includes a relief valve main body and a relief valve seat portion. The relief valve main body has a rod shape. The relief valve seat portion is integrated with an end of the relief valve main body so as to be capable of contacting the relief valve seat. The relief valve urging member urges the relief valve member toward the relief valve seat. A support portion includes a support main body that slidably supports an outer wall of the relief valve main body so as to guide a reciprocating movement of the relief valve member in the axial direction.Type: ApplicationFiled: November 25, 2019Publication date: March 19, 2020Inventors: Tatsuro KOGA, Noriya MATSUMOTO
-
Patent number: 10527017Abstract: In a high-pressure pump, a relief valve seat surrounds an opening of a relief valve passage of a valve seat main body in a first space. A relief valve member includes a relief valve main body and a relief valve seat portion. The relief valve main body has a rod shape. The relief valve seat portion is integrated with an end of the relief valve main body so as to be capable of contacting the relief valve seat. The relief valve member is provided in the first space so as to be reciprocable in an axial direction. A relief valve urging member urges the relief valve member toward the relief valve seat. A support portion includes a support main body that slidably supports an outer wall of the relief valve main body so as to guide a reciprocating movement of the relief valve member in the axial direction.Type: GrantFiled: May 10, 2016Date of Patent: January 7, 2020Assignee: DENSO CORPORATIONInventors: Tatsuro Koga, Noriya Matsumoto
-
Patent number: 10344724Abstract: In a high-pressure pump, a relief valve main body has a rod shape. A relief valve seat portion is integrated with an end of a relief valve main body so as to be capable of contacting a relief valve seat. The relief valve main body is inserted into a guide hole portion of a support portion. The guide hole portion slidably supports an outer wall of the relief valve main body so as to guide a reciprocating movement of the relief valve main body in the axial direction. A fuel guide portion is provided at an end portion of the relief valve main body facing the pressurizing chamber and can guide a flow of the fuel in a direction radially outward of the relief valve main body on the way from the pressurizing chamber toward the valve seat portion.Type: GrantFiled: May 10, 2016Date of Patent: July 9, 2019Assignee: DENSO CORPORATIONInventors: Tatsuro Koga, Noriya Matsumoto, Seiji Tanizawa
-
Patent number: 10030650Abstract: A valve body is provided with a discharge relief portion. A relief valve outlet is formed in an end face thereof on a central axis of the valve body. Discharge valve inlets are point-symmetrically formed with respect to the central axis. A discharge valve outlet is formed in another end face thereof and relief valve inlets are point-symmetrically formed with respect to the central axis. A discharge valve outlet and the discharge valve inlets communicate with each other. A flow of fuel from a pressurization chamber to a fuel discharge port is restricted by a discharge valve member capable of closing the discharge valve outlet. The relief valve outlet and the relief valve inlets communicate with each other. A flow of fuel from the fuel discharge port to the pressurization chamber is restricted by a relief valve member capable of closing the relief valve outlet.Type: GrantFiled: October 1, 2015Date of Patent: July 24, 2018Assignee: DENSO CORPORATIONInventors: Masatoshi Kuroyanagi, Shinobu Oikawa, Tatsuro Koga
-
Publication number: 20180163682Abstract: In a high-pressure pump, a relief valve main body has a rod shape. A relief valve seat portion is integrated with an end of a relief valve main body so as to be capable of contacting a relief valve seat. The relief valve main body is inserted into a guide hole portion of a support portion. The guide hole portion slidably supports an outer wall of the relief valve main body so as to guide a reciprocating movement of the relief valve main body in the axial direction. A fuel guide portion is provided at an end portion of the relief valve main body facing the pressurizing chamber and can guide a flow of the fuel in a direction radially outward of the relief valve main body on the way from the pressurizing chamber toward the valve seat portion.Type: ApplicationFiled: May 10, 2016Publication date: June 14, 2018Inventors: Tatsuro KOGA, Noriya MATSUMOTO, Seiji TANIZAWA
-
Publication number: 20180135580Abstract: In a high-pressure pump, a relief valve seat surrounds an opening of a relief valve passage of a valve seat main body in a first space. A relief valve member includes a relief valve main body and a relief valve seat portion. The relief valve main body has a rod shape. The relief valve seat portion is integrated with an end of the relief valve main body so as to be capable of contacting the relief valve seat. The relief valve member is provided in the first space so as to be reciprocable in an axial direction. A relief valve urging member urges the relief valve member toward the relief valve seat. A support portion includes a support main body that slidably supports an outer wall of the relief valve main body so as to guide a reciprocating movement of the relief valve member in the axial direction.Type: ApplicationFiled: May 10, 2016Publication date: May 17, 2018Inventors: Tatsuro KOGA, Noriya MATSUMOTO
-
Publication number: 20170218904Abstract: A discharge valve of a high-pressure pump is placed in a discharge passage and is openable to enable flow of fuel from a pressurizing chamber to a discharge outlet in response to a fuel pressure difference between the pressurizing chamber side and the discharge outlet side. A relief is placed in a relief passage. The relief passage communicates between a branching portion, which is located on a side of the discharge valve where the discharge outlet is placed in the discharge passage, and a return portion, which merges with a damper chamber. The relief valve is openable to enable flow of the fuel from the branching portion to the return portion in response to a fuel pressure difference between the branching portion side and the return portion side. A discharge passage orifice is placed between the discharge valve and the branching portion in the discharge passage and constricts a flow passage cross-sectional area of the discharge passage.Type: ApplicationFiled: November 26, 2015Publication date: August 3, 2017Applicant: DENSO CORPORATIONInventors: Tatsuro KOGA, Yutaka MIYAMOTO, Teppei MATSUMOTO
-
Publication number: 20160025054Abstract: A valve body is provided with a discharge relief portion. A relief valve outlet is formed in an end face thereof on a central axis of the valve body. Discharge valve inlets are point-symmetrically formed with respect to the central axis. A discharge valve outlet is formed in another end face thereof and relief valve inlets are point-symmetrically formed with respect to the central axis. A discharge valve outlet and the discharge valve inlets communicate with each other. A flow of fuel from a pressurization chamber to a fuel discharge port is restricted by a discharge valve member capable of closing the discharge valve outlet. The relief valve outlet and the relief valve inlets communicate with each other. A flow of fuel from the fuel discharge port to the pressurization chamber is restricted by a relief valve member capable of closing the relief valve outlet.Type: ApplicationFiled: October 1, 2015Publication date: January 28, 2016Inventors: Masatoshi KUROYANAGI, Shinobu OIKAWA, Tatsuro KOGA
-
Patent number: 9181944Abstract: A valve body is provided with a discharge relief portion. A relief valve outlet is formed in an end face thereof on a central axis of the valve body. Discharge valve inlets are point-symmetrically formed with respect to the central axis. A discharge valve outlet is formed in another end face thereof and relief valve inlets are point-symmetrically formed with respect to the central axis. A discharge valve outlet and the discharge valve inlets communicate with each other. A flow of fuel from a pressurization chamber to a fuel discharge port is restricted by a discharge valve member capable of closing the discharge valve outlet. The relief valve outlet and the relief valve inlets communicate with each other. A flow of fuel from the fuel discharge port to the pressurization chamber is restricted by a relief valve member capable of closing the relief valve outlet.Type: GrantFiled: March 29, 2012Date of Patent: November 10, 2015Assignee: DENSO CORPORATIONInventors: Masatoshi Kuroyanagi, Shinobu Oikawa, Tatsuro Koga
-
Publication number: 20140314605Abstract: A common seat portion includes discharge passages that communicate between a first valve chamber and a second valve chamber when a discharge valve member is lifted away from the common seat portion. The common seat portion also includes a relief passage that extends substantially parallel to the discharge passages and communicates between the first valve chamber and the second valve chamber when a relief valve member is lifted away from the common seat portion.Type: ApplicationFiled: April 16, 2014Publication date: October 23, 2014Applicants: DENSO CORPORATION, NIPPON SOKEN, INC.Inventors: Tatsuro KOGA, Ichiki TERASHIMA, Toshihide ONO, Seiji TANIZAWA, Takehiko KATO, Masatoshi KUROYANAGI, Shinobu OIKAWA, Noriya MATSUMOTO
-
Patent number: 8608456Abstract: At least one choked flow passage communicates between one side of the movable member and the other side of the movable member and limits an amount of fuel, which passes from the one side of the movable member to the other side of the movable member, when the movable member is moved by an urging force of a relief spring toward a valve element. A larger amount of fuel, which is larger than the amount of fuel that is passable through the at least one choked flow passage, flows from a first return flow passage to a second return flow passage, when the movable member is moved toward the other side, which is opposite from the valve element, against the urging force of the relief spring.Type: GrantFiled: January 19, 2012Date of Patent: December 17, 2013Assignees: Nippon Soken, Inc., Denso CorporationInventors: Osamu Hishinuma, Tatsuro Koga
-
Publication number: 20120251366Abstract: A valve body is provided with a discharge relief portion. A relief valve outlet is formed in an end face thereof on a central axis of the valve body. Discharge valve inlets are point-symmetrically formed with respect to the central axis. A discharge valve outlet is formed in another end face thereof and relief valve inlets are point-symmetrically formed with respect to the central axis. A discharge valve outlet and the discharge valve inlets communicate with each other. A flow of fuel from a pressurization chamber to a fuel discharge port is restricted by a discharge valve member capable of closing the discharge valve outlet. The relief valve outlet and the relief valve inlets communicate with each other. A flow of fuel from the fuel discharge port to the pressurization chamber is restricted by a relief valve member capable of closing the relief valve outlet.Type: ApplicationFiled: March 29, 2012Publication date: October 4, 2012Applicant: DENSO CORPORATIONInventors: Masatoshi Kuroyanagi, Shinobu Oikawa, Tatsuro Koga
-
Publication number: 20120195778Abstract: A gas chamber is placed adjacent to a variable volume chamber of a high pressure pump. The gas chamber includes an inner blocking wall, which borders on the variable volume chamber and contacts fuel in the variable volume chamber, an outer blocking wall, which is opposed to the inner blocking wall, and gas, which fills a space that is defined between the inner blocking wall and the outer blocking wall.Type: ApplicationFiled: January 18, 2012Publication date: August 2, 2012Applicants: NIPPON SOKEN, INC., DENSO CORPORATIONInventors: Tatsuro KOGA, Noriya MATSUMOTO, Osamu HISHINUMA, Shinobu OIKAWA
-
Publication number: 20120180649Abstract: At least one choked flow passage communicates between one side of the movable member and the other side of the movable member and limits an amount of fuel, which passes from the one side of the movable member to the other side of the movable member, when the movable member is moved by an urging force of a relief spring toward a valve element. A larger amount of fuel, which is larger than the amount of fuel that is passable through the at least one choked flow passage, flows from a first return flow passage to a second return flow passage, when the movable member is moved toward the other side, which is opposite from the valve element, against the urging force of the relief spring.Type: ApplicationFiled: January 19, 2012Publication date: July 19, 2012Applicants: DENSO CORPORATION, NIPPON SOKEN, INC.Inventors: Osamu HISHINUMA, Tatsuro KOGA