Patents by Inventor Ekkehard Kohler
Ekkehard Kohler 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: 11311936Abstract: The invention relates to a highly heat conductive valve seat ring (1) comprising a carrier layer (2) and a functional layer (3), wherein the carrier layer (2) consists of a solidified copper matrix containing 0.10 to 20% w/w of a solidifying component and the functional layer (3) consists of a solidified copper matrix which further contains, based on the copper matrix, 5 to 35% w/w of one or more hard phases.Type: GrantFiled: May 24, 2017Date of Patent: April 26, 2022Assignee: Bleistahl-Produktions GmbH & Co KGInventors: Ekkehard Kohler, Dirk Emde, Ingwar Hunsche, Robert Hammelmann, Christian Blecking, Anna Seyfarth
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Publication number: 20200376544Abstract: The invention relates to a component produced powder metallurgically in the form of a valve guide or a valve seat ring having an iron-based matrix containing a mineral solid lubricant, with the matrix having a density ranging between 75 and 90% of the theoretical density, and with the mineral solid lubricant having a melting point that lies below the sintering temperature of the matrix and the remaining pore volume of the matrix of the component being melt infiltrated with the solid lubricant.Type: ApplicationFiled: April 26, 2018Publication date: December 3, 2020Applicant: Bleistahl-Produktions GmbH & Co KGInventors: Christopher Rynio, Ingwar Hünsche, Ekkehard KÖHLER
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Publication number: 20190143415Abstract: The invention relates to a highly heat conductive valve seat ring (1) comprising a carrier layer (2) and a functional layer (3), wherein the carrier layer (2) consists of a solidified copper matrix containing 0.10 to 20% w/w of a solidifying component s and the functional layer (3) consists of a solidified copper matrix which further contains, based on the copper matrix, 5 to 35% w/w of one or more hard phases.Type: ApplicationFiled: May 24, 2017Publication date: May 16, 2019Applicant: Bleistahl-Produktions GmbH &Co KGInventors: Ekkehard Kohler, Dirk Emde, Ingwar Hunsche, Robert Hammelmann, Christian Blecking, Anna Seyfarth
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Patent number: 10208636Abstract: The invention relates to a powdermetallurgically produced valve seat ring having a carrier layer and a function layer. It is the objective of the invention to provide a valve seat ring of the kind mentioned above that offers significantly higher thermal conductivity properties. To achieve this objective and based on a valve seat ring of the kind first mentioned above the invention proposes that the carrier material of the carrier layer has a thermal conductivity higher than 55 W/m*K at a total copper content ranging between >25 and 40% w/w.Type: GrantFiled: June 21, 2017Date of Patent: February 19, 2019Assignee: Bleistahl-Produktions GmbH & Co, KGInventors: Ekkehard Kohler, Dirk Emde, Anna Seyfarth, Thomas Lelgermann
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Publication number: 20180171836Abstract: The invention relates to a valve guide manufactured by powder-metallurgical processes for combustion engines, said guide comprising a central section, a cam-side end piece and a duct-side end piece, wherein the central section consists of a first material and the duct-side end piece of a second material, with the cam-side and/or duct-side end piece being infiltrated with copper.Type: ApplicationFiled: May 20, 2016Publication date: June 21, 2018Applicant: Bleistahl-Produktions GmbH & Co KGInventors: Ingwar Hunsche, Christian Blecking, Ekkehard Kohler
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Patent number: 9988951Abstract: The invention relates to a valve guide manufactured by a powder-metallurgical process for combustion engines, said guide comprising a central section, a cam-side end piece, and a duct-side end piece, wherein the central section consists of a first material and the duct-side end piece of a second material, with the second material having a hardness in excess of 70 HRB and the first material having a hardness that is by at least 10 HRB lower than that of the second material.Type: GrantFiled: December 16, 2014Date of Patent: June 5, 2018Assignee: Bleistahl-Produktions GmbH & Co KGInventors: Ingwar Hunsche, Christian Blecking, Ekkehard Kohler, Dirk Emde
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Publication number: 20170298790Abstract: The invention relates to a powdermetallurgically produced valve seat ring having a carrier layer and a function layer. It is the objective of the invention to provide a valve seat ring of the kind mentioned above that offers significantly higher thermal conductivity properties. To achieve this objective and based on a valve seat ring of the kind first mentioned above the invention proposes that the carrier material of the carrier layer has a thermal conductivity higher than 55 W/m*K at a total copper content ranging between >25 and 40% w/w.Type: ApplicationFiled: June 21, 2017Publication date: October 19, 2017Applicant: Bleistahl-Produktions GmbH & Co. KGInventors: Ekkehard Kohler, Dirk Emde, Anna Seyfarth, Thomas Lelgermann
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Patent number: 9702277Abstract: The invention relates to a powdermetallurgically produced valve seat ring having a carrier layer and a function layer. It is the objective of the invention to provide a valve seat ring of the kind mentioned above that offers significantly higher thermal conductivity properties. To achieve this objective and based on a valve seat ring of the kind first mentioned above the invention proposes that the carrier material of the carrier layer has a thermal conductivity higher than 55 W/m*K at a total copper content ranging between >25 and 40% w/w.Type: GrantFiled: July 3, 2013Date of Patent: July 11, 2017Assignee: Bleistahl-Produktions GmbH & Co. KGInventors: Ekkehard Kohler, Dirk Emde, Anna Seyfarth, Thomas Lelgermann
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Publication number: 20160312668Abstract: The invention relates to a valve guide manufactured by a powder-metallurgies process for combustion engines, said guide comprising a central section, a cam-side end piece, and a duct-side end piece, wherein the central section consists of a first material and the duct-side end piece of a second material, with the second material having a hardness in excess of 70 HRB and the first material having a hardness that is by at least 10 HRB lower than that of the second material.Type: ApplicationFiled: December 16, 2014Publication date: October 27, 2016Applicant: Bleistahl-Produktions GmbH & Co KGInventors: Ingwar Hunsche, Christian Blecking, Ekkehard Kohler, Dirk Emde
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Publication number: 20150322828Abstract: The invention relates to a powdermetallurgically produced valve seat ring having a carrier layer and a function layer. It is the objective of the invention to provide a valve seat ring of the kind mentioned above that offers significantly higher thermal conductivity properties. To achieve this objective and based on a valve seat ring of the kind first mentioned above the invention proposes that the carrier material of the carrier layer has a thermal conductivity higher than 55 W/m*K at a total copper content ranging between >25 and 40% w/w.Type: ApplicationFiled: July 3, 2013Publication date: November 12, 2015Applicant: Bleistahl-Produktions GmbH & Co. KGInventors: Ekkehard Kohler, Dirk Emde, Anna Seyfarth, Thomas Lelgemann
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Publication number: 20060201488Abstract: In a method for controlling the opening and/or closing of a solenoid valve, wherein a profile of a current and/or a voltage applied to a coil of the solenoid valve is controlled in order to move a valve control element, a plurality of points in time of the opening and closing movement of the valve control element resulting from physical characteristic values of the current profile and/or solenoid valve are detected, and the time period between the detected points in time of the preceding opening and closing process is used as a control variable for controlling the current profile and/or voltage profile during the opening and closing process.Type: ApplicationFiled: April 6, 2006Publication date: September 14, 2006Inventors: Ekkehard Kohler, Wolfgang Messerschmidt
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Patent number: 6039785Abstract: The invention concerns a material for the powder-metallurgical production from a powder mixture containing at least approximately 50 wt. % copper in particular of valve seat rings or valve guides with high resistance to wear and corrosion and high heat conductivity. The starting powder mixture consists of between 50 and 90 wt. % of a basic powder, containing the copper portion, and between 10 and 50 wt. % of a powdery molybdenum-containing alloy flux. The basic powder is a copper powder which is dispersion-hardened by Al.sub.2 O.sub.3, has an Al.sub.2 O.sub.3 content of between 0.1 and 1.1 wt. %, and is produced by pulverizing a Cu--Al melt followed by heating in an oxidizing atmosphere. The invention further concerns the use of a dispersion-hardened powder of this type for the powder-metallurgical production in particular of wear and corrosion-resistant valve seat rings or valve guides with high heat conductivity. Finally, the invention concerns a method of producing such valve seat rings or valve guides.Type: GrantFiled: October 15, 1998Date of Patent: March 21, 2000Assignees: Bleistahl Produktions-GmbH & Co. KG, SCM Metal Products, Inc.Inventors: Kirit Dalal, Ekkehard Kohler, Anil V. Nadkarni