Patents by Inventor Markus Lettmann
Markus Lettmann 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: 9828889Abstract: A camshaft for an internal combustion engine may include a shaft and at least one component that is joined to said shaft. The component may be connected via a joint surface of the component to a joint surface of the shaft. At least one of the joint surface of the component and the joint surface of the shaft may have a predefined roughness only partially on load-critical regions.Type: GrantFiled: July 18, 2012Date of Patent: November 28, 2017Assignee: Mahle International GmbHInventors: Markus Lettmann, Ralf Rieger, Falk Schneider, Lutz Grunwald, Antonio Menonna, Stefan Steichele
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Patent number: 9388713Abstract: A camshaft for an internal combustion engine may include a shaft and at least one component thermally joined thereto. The at least one component may be connected via a component-side joining face to a shaft-side joining face of the shaft. At least one of the component-side joining face and the shaft-side joining face may include a predefined roughness introduced and hardened via a laser. The predefined roughness may define at least one track composed of a plurality of individual laser spots. Each of the plurality of individual laser spots may include a center point arranged offset to each other. The plurality of individual laser spots may respectively be arranged to overlapping each other.Type: GrantFiled: July 18, 2013Date of Patent: July 12, 2016Assignee: Mahle International GmbHInventors: Markus Lettmann, Ralf Rieger, Falk Schneider
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Publication number: 20150184555Abstract: A camshaft for an internal combustion engine may include a shaft and at least one component thermally joined thereto. The at least one component may be connected via a component-side joining face to a shaft-side joining face of the shaft. At least one of the component-side joining face and the shaft-side joining face may include a predefined roughness introduced and hardened via a laser. The predefined roughness may define at least one track composed of a plurality of individual laser spots. Each of the plurality of individual laser spots may include a centre point arranged offset to each other. The plurality of individual laser spots may respectively be arranged to overlapping each other.Type: ApplicationFiled: July 18, 2013Publication date: July 2, 2015Applicant: Mahle International GmbHInventors: Markus Lettmann, Ralf Rieger, Falk Schneider
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Publication number: 20140238321Abstract: A camshaft for an internal combustion engine may include a shaft and at least one component that is joined to said shaft. The component may be connected via a joint surface of the component to a joint surface of the shaft. At least one of the joint surface of the component and the joint surface of the shaft may have a predefined roughness only partially on load-critical regions.Type: ApplicationFiled: July 18, 2012Publication date: August 28, 2014Applicant: Mahle International GmbHInventors: Markus Lettmann, Ralf Rieger, Falk Schneider, Lutz Grunwald, Antonio Menonna, Stefan Steichele
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Patent number: 8453615Abstract: The present invention relates to an adjustable camshaft (1), wherein inner and outer shafts (4, 2) connected securely with cams (5, 6) can be rotated relative to each other. In order to obtain this relative movement, at least one hydraulic adjusting device (3) is provided at one end of the camshaft (1), wherein a rotor (2) is rotatable in relation to a stator (19), and the rotor (20) and the stator (19) are each connected securely with one of the two shafts (2, 4). It is essential to the invention that the camshaft (1) is part of a prefabricated camshaft assembly, comprising at least the following components oriented relative to each other: camshaft (1) comprising inner shaft (4), outer shaft (2), cams (5, 6) and adjusting device (3) and a chain wheel (10).Type: GrantFiled: September 4, 2007Date of Patent: June 4, 2013Assignee: Mahle International GmbHInventors: Markus Lettmann, Falk Schneider
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Publication number: 20100108004Abstract: The present invention relates to an adjustable camshaft (1), wherein inner and outer shafts (4, 2) connected securely with cams (5, 6) can be rotated relative to each other. In order to obtain this relative movement, at least one hydraulic adjusting device (3) is provided at one end of the camshaft (1), wherein a rotor (2) is rotatable in relation to a stator (19), and the rotor (20) and the stator (19) are each connected securely with one of the two shafts (2, 4). It is essential to the invention that the camshaft (1) is part of a prefabricated camshaft assembly, comprising at least the following components oriented relative to each other: camshaft (1) comprising inner shaft (4), outer shaft (2), cams (5, 6) and adjusting device (3) and a chain wheel (10).Type: ApplicationFiled: September 4, 2007Publication date: May 6, 2010Inventors: Markus Lettmann, Falk Schneider
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Patent number: 7610890Abstract: The aim of the invention is to provide a reliable and inexpensive camshaft wherein the inner shaft and the outer shaft can be adjusted in a low-friction manner. For this purpose, a camshaft with cams that can be rotated in relation to each other, wherein at least one first cam (3) is rotatably received on the outer shaft (1), is permanently connected to the inner shaft (2) via at least one radial opening in the outer shaft (1). Means (10) for connecting a camshaft rotational drive are provided at the axial ends of the camshaft. The camshaft is also provided with a rotational drive (9) exerting radial supporting forces onto the camshaft.Type: GrantFiled: January 13, 2006Date of Patent: November 3, 2009Assignee: Mahle International GmbHInventors: Markus Lettmann, Roland Schacherer, Falk Schneider
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Patent number: 7597078Abstract: The present invention relates to a camshaft (1) having cams (3 and 4) rotatable with respect to one another about the camshaft axis (2) over limited circumferential angles, whereby an inside shaft (5) and an outside shaft (6) are arranged coaxially one inside the other. The cams (3 and 4) that are rotatable with respect to one another each consist of first cams (3) and second cams (4), whereby the first cams (3) are fixedly connected to the inside shaft (5) and the second cams (4) are fixedly connected to the outside shaft (6), each by means of a fixation device (8). It is essential to this invention that the first cams (3) each have a first through-bore (11) which is aligned with a respective second through-bore (12) in the inside shaft (5) when the first cam (3) is installed. In addition, the fixation device (8) is formed by two essentially identical fixation pins (10 and 10?) with respect to their axial longitudinal extent.Type: GrantFiled: December 21, 2006Date of Patent: October 6, 2009Assignee: Mahle International GmbHInventors: Peter Kroos, Markus Lettmann, Falk Schneider
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Patent number: 7503293Abstract: The present invention relates to an adjustable camshaft in which an inside shaft and an outside shaft, each being fixedly connected to cams, are mounted so they are rotatable in relation to one another. To produce the relative movement, a hydraulic adjusting mechanism is provided on one of the ends thereof; in the adjusting mechanism, first and second rotatable adjusting elements are each fixedly connected to one of the two shafts opposite one another. Adjacent to the adjusting mechanism, the outside shaft is fixedly connected to a first bearing ring supporting at least the outside shaft in a stationary first abutment.Type: GrantFiled: June 19, 2007Date of Patent: March 17, 2009Assignee: MAHLE International GmbHInventors: Markus Lettmann, Falk Schneider
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Publication number: 20080257290Abstract: The aim of the invention is to provide a reliable and inexpensive camshaft wherein the inner shaft and the outer shaft can be adjusted in a low-friction manner. For this purpose, a camshaft with cams that can be rotated in relation to each other, wherein at least one first cam (3) is rotatably received on the outer shaft (1), is permanently connected to the inner shaft (2) via at least one radial opening in the outer shaft (1). Means (10) for connecting a camshaft rotational drive are provided at the axial ends of the camshaft. The camshaft is also provided with a rotational drive (9) exerting radial supporting forces onto the camshaft.Type: ApplicationFiled: January 13, 2006Publication date: October 23, 2008Applicant: MAHLE INTERNATIONAL GMBHInventors: Markus Lettmann, Roland Schacherer, Falk Schneider
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Publication number: 20070295296Abstract: The present invention relates to an adjustable camshaft in which an inside shaft and an outside shaft, each being fixedly connected to cams, are mounted so they are rotatable in relation to one another. To produce the relative movement, a hydraulic adjusting mechanism is provided on one of the ends thereof; in the adjusting mechanism, first and second rotatable adjusting elements are each fixedly connected to one of the two shafts opposite one another. Adjacent to the adjusting mechanism, the outside shaft is fixedly connected to a first bearing ring supporting at least the outside shaft in a stationary first abutment.Type: ApplicationFiled: June 19, 2007Publication date: December 27, 2007Applicant: MAHLE International GmbHInventors: Markus Lettmann, Falk Schneider
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Publication number: 20070144469Abstract: The present invention relates to a camshaft (1) having cams (3 and 4) rotatable with respect to one another about the camshaft axis (2) over limited circumferential angles, whereby an inside shaft (5) and an outside shaft (6) are arranged coaxially one inside the other. The cams (3 and 4) that are rotatable with respect to one another each consist of first cams (3) and second cams (4), whereby the first cams (3) are fixedly connected to the inside shaft (5) and the second cams (4) are fixedly connected to the outside shaft (6), each by means of a fixation device (8). It is essential to this invention that the first cams (3) each have a first through-bore (11) which is aligned with a respective second through-bore (12) in the inside shaft (5) when the first cam (3) is installed. In addition, the fixation device (8) is formed by two essentially identical fixation pins (10 and 10?) with respect to their axial longitudinal extent.Type: ApplicationFiled: December 21, 2006Publication date: June 28, 2007Inventors: Peter Kroos, Markus Lettmann, Falk Schneider
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Publication number: 20050241796Abstract: For the production of piston pins having a hard peripheral area, a relatively inexpensive chill casting method is used. A chill form having a mold cavity for a piston pin is embedded in a casting mold, cast iron is poured into the mold cavity of the chill form, and then the peripheral area of the piston pin that results from this process is cooled by means of the chill form, is white-solidified, and thereby forms a hard wear-resistant surface.Type: ApplicationFiled: April 29, 2004Publication date: November 3, 2005Inventors: Markus Lettmann, David Roth, Thomas Glas, Norbert Schneider, Giang Nguyen, Rodrigo Consentino