Patents by Inventor Ralf Lammers
Ralf Lammers 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: 11408508Abstract: A piston ring (10) has a running surface (12) and a flank surface (14) which are coated. The uppermost layer of the running surface (12) is a hydrogen-containing or a hydrogen-free DLC layer, and the uppermost layer of at least one flank surface (14) is a chromium layer. A method of producing a piston ring (10) includes forming a DLC layer as the uppermost layer of the running surface (12), and forming a chromium layer as the uppermost layer of at least one flank surface (14).Type: GrantFiled: November 28, 2018Date of Patent: August 9, 2022Assignee: Federal-Mogul Burscheid GmbHInventors: Walter Stumpf, Steffen Hoppe, Ralf Lammers, Rudolf Linde
-
Publication number: 20200309263Abstract: A piston ring (10) has a running surface (12) and a flank surface (14) which are coated. The uppermost layer of the running surface (12) is a hydrogen-containing or a hydrogen-free DLC layer, and the uppermost layer of at least one flank surface (14) is a chromium layer. A method of producing a piston ring (10) includes forming a DLC layer as the uppermost layer of the running surface (12), and forming a chromium layer as the uppermost layer of at least one flank surface (14).Type: ApplicationFiled: November 28, 2018Publication date: October 1, 2020Inventors: WALTER STUMPF, STEFFEN HOPPE, RALF LAMMERS, RUDOLF LINDE
-
Patent number: 10370755Abstract: A piston ring is produced in which a piston ring base body made of cast iron or cast steel is coated with at least one PVD layer having a variable layer thickness, such that an increased layer thickness is present in the region of the ring ends compared to the remaining circumferential region of the piston ring base body, wherein the piston ring base body is configured so that, in the cold operating state with the engine not running, the radial pressure distribution of the piston ring base body is such that the ring ends exhibit substantially no radial pressure across a defined circumferential angle, and the variable layer thickness of the PVD layer is set so that a substantially uniform radial pressure distribution is present along the entire ring circumference of the piston ring at a piston ring temperature above 150° C.Type: GrantFiled: May 10, 2014Date of Patent: August 6, 2019Assignee: Wilmington Trust, National Association, as Collateral TrusteeInventors: Ralf Lammers, Christiane Bauer, Yurly Ivanov
-
Publication number: 20180259069Abstract: Disclosed is a piston ring having a substrate to which a wear resistant coating is applied that includes at least one first element with a melting point Tm>760° C. The wear resistant coating contains at least one second element with a melting point Tm>760° C. The wear resistant coating also includes droplets which have a diameter and which contain at least the first element, where at least 90% of the droplets have a value 1 ?m?D?10 ?m. In the method for producing a wear resistant coating using an arc evaporation techniques, the target material includes at least one first element with a melting point Tm>760° C. and at least one second element with a melting point Tm>760° C., wherein the quantity of the second material contained in the target material is such that the melting point Tm of the target material >1000° C.Type: ApplicationFiled: March 12, 2018Publication date: September 13, 2018Inventors: RALF LAMMERS, CHRISTIANE BAUER, MANFRED FISCHER, JORG VETIER
-
Patent number: 10000840Abstract: The invention relates to a piston ring which is produced from a carrier material, especially steel or a cast material. The piston ring has a wear-resistant coating from a periodic multilayer system, every periodicity consisting of at least two individual metal nitride layers. The multilayer system has superlattice structures, the thickness of an individual layer being ?2 nm to <15 nm and the thickness of the multilayer system being >4.5 ?m and adjacent individual layers within the periodicity having different metallic elements.Type: GrantFiled: October 1, 2007Date of Patent: June 19, 2018Assignee: Federal-Mogul Burscheid GmbHInventors: Manfred Fischer, Ralf Lammers, Christiane Bauer, Steffen Hoppe
-
Patent number: 9915346Abstract: Disclosed is a piston ring (1) having a substrate (10) to which a wear resistant coating (20) is applied that includes at least one first element with a melting point Tm?700° C. The wear resistant coating (20) contains at least one second element with a melting point Tm>760° C. The wear resistant coating also includes droplets (30) which have a diameter (D) and which contain at least the first element, wherein at least 90% of the droplets (30) have a value 1 ?m?D?10 ?m. In the method for producing a wear resistant coating (20) using an arc evaporation technique, the target material includes at least one first element with a melting point Tm?700° C. and at least one second element with a melting point Tm>760° C., wherein the quantity of the second material contained in the target material is such that the melting point (Tm) of the target material ?1000° C.Type: GrantFiled: January 14, 2013Date of Patent: March 13, 2018Assignee: Federal-Mogul Burscheid GmbHInventors: Ralf Lammers, Christiane Bauer, Manfred Fischer, Jorg Vetter
-
Patent number: 9598763Abstract: The invention relates to a piston ring which is produced from a carrier material, especially steel or a cast material. The piston ring has a wear-resistant coating from a periodic multilayer system, every periodicity consisting of at least two individual metal nitride layers. Adjacent individual layers within the periodicity have different metallic elements. The thickness of an individual layer is ?15 nm.Type: GrantFiled: October 1, 2007Date of Patent: March 21, 2017Assignee: Federal-Mogul Burscheid GmbHInventors: Manfred Fischer, Ralf Lammers, Christiane Bauer, Steffen Hoppe
-
Patent number: 9488275Abstract: The invention relates to a sliding element, in particular a piston ring, having at least one running surface. The running surface comprises a coating, which from the inside to the outside has at least one first adhesive layer, a hard hydrogen-free DLC layer, a second adhesive layer, a soft hydrogen-containing, metal and/or metal carbide-containing DLC layer, which is softer than the hard hydrogen-free DLC layer, and a hard hydrogen-containing DLC layer, which is harder than the soft hydrogen-containing, metal and/or metal carbide containing DLC layer.Type: GrantFiled: January 8, 2014Date of Patent: November 8, 2016Assignee: Federal-Mogul Burscheid GmbHInventors: Yuriy Ivanov, Marcus Kennedy, Ralf Lammers, Michael Zinnabold
-
Patent number: 9488276Abstract: The present application relates to a sliding element, in particular a piston ring, having at least one sliding surface which has a coating which has, from the inside outwards, a metal-containing bonding layer and a DLC layer, where the DLC layer is an amorphous hydrogen-free diamond-like carbon layer which has a DLC main layer which extends from the bonding layer to an adjoining DLC covering layer and has a carbon content of more than about 98.5 at %, oxygen and/or hydrogen and/or nitrogen in a proportion of in each case less than about 0.5 at % and an sp2/sp3 ratio of the carbon in the range from about 1 to about 3, and a DLC covering layer which extends from the DLC main layer to the surface of the sliding element and has a lower carbon content and/or higher oxygen content and/or higher hydrogen content compared to the main layer and also metals and/or metal oxides and an sp2/sp3 ratio of the carbon in the range from about 1 to about 3.Type: GrantFiled: October 31, 2013Date of Patent: November 8, 2016Assignee: Federal-Mogul Burscheid GmbHInventors: Marcus Kennedy, Ralf Lammers, Yuriy Ivanov, Michael Zinnabold
-
Patent number: 9447490Abstract: In order to avoid burn traces on piston rings, it is proposed to provide the piston ring with a wear-protection coating which consists of a material with a thermal conductivity of at least 180 W/(m·K). At least 5% vol. of the wear-protection coating consists of aluminum nitride.Type: GrantFiled: July 18, 2008Date of Patent: September 20, 2016Assignee: Federal-Mogul Burscheid GmbHInventors: Steffen Hoppe, Manfred Fischer, Christiane Bauer, Ralf Lammers
-
Publication number: 20160122862Abstract: A piston ring is produced in which a piston ring base body made of cast iron or cast steel is coated with at least one PVD layer having a variable layer thickness, such that an increased layer thickness is present in the region of the ring ends compared to the remaining circumferential region of the piston ring base body, wherein the piston ring base body is configured so that, in the cold operating state with the engine not running, the radial pressure distribution of the piston ring base body is such that the ring ends exhibit substantially no radial pressure across a defined circumferential angle, and the variable layer thickness of the PVD layer is set so that a substantially uniform radial pressure distribution is present along the entire ring circumference of the piston ring at a piston ring temperature above 150° C.Type: ApplicationFiled: May 10, 2014Publication date: May 5, 2016Inventors: Ralf LAMMERS, Christiane BAUER, Yurly IVANOV
-
Publication number: 20150362071Abstract: The invention relates to a sliding element, in particular a piston ring, having at least one running surface. The running surface comprises a coating, which from the inside to the outside has at least one first adhesive layer, a hard hydrogen-free DLC layer, a second adhesive layer, a soft hydrogen-containing, metal and/or metal carbide-containing DLC layer, which is softer than the hard hydrogen-free DLC layer, and a hard hydrogen-containing DLC layer, which is harder than the soft hydrogen-containing, metal and/or metal carbide containing DLC layer.Type: ApplicationFiled: January 8, 2014Publication date: December 17, 2015Inventors: Yuriy Ivanov, Marcus Kennedy, Ralf Lammers, Michael Zinnabold
-
Publication number: 20150292622Abstract: The present application relates to a sliding element, in particular a piston ring, having at least one sliding surface which has a coating which has, from the inside outwards, a metal-containing bonding layer and a DLC layer, where the DLC layer is an amorphous hydrogen-free diamond-like carbon layer which has a DLC main layer which extends from the bonding layer to an adjoining DLC covering layer and has a carbon content of more than about 98.5 at %, oxygen and/or hydrogen and/or nitrogen in a proportion of in each case less than about 0.5 at % and an sp2/sp3 ratio of the carbon in the range from about 1 to about 3, and a DLC covering layer which extends from the DLC main layer to the surface of the sliding element and has a lower carbon content and/or higher oxygen content and/or higher hydrogen content compared to the main layer and also metals and/or metal oxides and an sp2/sp3 ratio of the carbon in the range from about 1 to about 3.Type: ApplicationFiled: October 31, 2013Publication date: October 15, 2015Inventors: Marcus Kennedy, Ralf Lammers, Yuriy Ivanov, Michael Zinnabold
-
Publication number: 20140353923Abstract: Disclosed is a piston ring (1) having a substrate (10) to which a wear resistant coating (20) is applied that includes at least one first element with a melting point Tm?700° C. The wear resistant coating (20) contains at least one second element with a melting point Tm>760° C. The wear resistant coating also includes droplets (30) which have a diameter (D) and which contain at least the first element, wherein at least 90% of the droplets (30) have a value 1 ?m?D?10 ?m. In the method for producing a wear resistant coating (20) using an arc evaporation technique, the target material includes at least one first element with a melting point Tm?700° C. and at least one second element with a melting point Tm>760° C., wherein the quantity of the second material contained in the target material is such that the melting point (Tm) of the target material ?1000° C.Type: ApplicationFiled: January 14, 2013Publication date: December 4, 2014Inventors: Ralf Lammers, Christiane Bauer, Manfred Fischer, Jorg Vetter
-
Patent number: 8857820Abstract: A piston ring, in particular a compression piston ring, includes a running surface, upper and lower flank areas, an inner peripheral area and a joint. The wall thickness of the piston ring is uniform over its periphery and at least the running surface is provided with a PVD coating or a CVD layer in such a manner that the running surface layer has a lesser layer thickness in the peripheral area close to the joint than in the remaining peripheral area of the running surface.Type: GrantFiled: October 14, 2010Date of Patent: October 14, 2014Assignee: Federal-Mogul Burscheid GmbHInventors: Christian Herbst-Dederichs, Peter-Klaus Esser, Ralf Lammers, Sebastian Bresinski
-
Publication number: 20130136861Abstract: In a method for coating at least part of the inner face of a piston ring, said ring preferably consisting of cast iron or steel, a PVD and/or DLC coating is applied by means of at least one of the following methods: PA-CVD, glow discharge and/or HIPIMS. A piston ring has a coating that is formed at least on part of the inner face of said ring, said coating being a PVD and/or DLC coating that preferably has been applied by means of PA-CVD, glow discharge and/or HIPIMS.Type: ApplicationFiled: February 17, 2011Publication date: May 30, 2013Inventors: Dirk Barenreuter, Marcus Kennedy, Markus Kellner, Ralf Lammers
-
Patent number: 8273469Abstract: Disclosed is a piston ring comprising a supporting material and a wear-resistant coating. The wear-resistant coating is composed of a ternary system A-B—N which is applied using a PVD process and in which A and B each represent an element form the group encompassing Ti, Zr, Hf, V, Nb, Ta, Cr, Mo W, Al, Si and C, wherein A?B and N represents nitrogen. The thickness of the wear-resistant coating amounts to ?3 ?m.Type: GrantFiled: June 12, 2008Date of Patent: September 25, 2012Assignee: Federal-Mogul Burscheid GmbHInventors: Steffen Hoppe, Manfred Fischer, Christiane Bauer, Ralf Lammers
-
Publication number: 20120228831Abstract: A piston ring, in particular a compression piston ring, includes a running surface, upper and lower flank areas, an inner peripheral area and a joint. The wall thickness of the piston ring is uniform over its periphery and at least the running surface is provided with a PVD coating or a CVD layer in such a manner that the running surface layer has a lesser layer thickness in the peripheral area close to the joint than in the remaining peripheral area of the running surface.Type: ApplicationFiled: October 14, 2010Publication date: September 13, 2012Inventors: Christian Herbst-Dederichs, Peter-Klaus Esser, Ralf Lammers, Sebastian Bresinski
-
Patent number: 8201831Abstract: A sliding element comprises at least one surface for sliding contact with a running face, wherein a wear layer and a run-in layer made from carbon are applied to the surface, and is characterized in that the run-in layer comprises hydrogen and nanocrystalline carbide phases. In a method for manufacturing a sliding element, the run-in layer is applied by means of a PVD process. A sliding system has an above-described sliding element and a body having a running face. A coating for a sliding element comprises a wear layer which can be applied to the upper side of the sliding element, and a run-in layer which is configured as a carbon layer, and is characterized in that the run-in layer comprises hydrogen and nanocrystalline carbide phases.Type: GrantFiled: November 30, 2006Date of Patent: June 19, 2012Assignee: Federal-Mogul Burscheid GmbHInventors: Steffen Hoppe, Manfred Fischer, Ralf Lammers, Manfred Muller, Christiane Bauer, Reiner Waller, Jorg Vetter
-
Publication number: 20100187765Abstract: In order to avoid burn traces on piston rings, it is proposed to provide the piston ring with a wear-protection coating which consists of a material with a thermal conductivity of at least 180 W/(m.K). At least 5% vol. of the wear-protection coating consists of aluminum nitride.Type: ApplicationFiled: July 18, 2008Publication date: July 29, 2010Inventors: Steffen Hoppe, Manfred Fischer, Christiane Bauer, Ralf Lammers