Patents by Inventor Stefan Dorn

Stefan Dorn 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: 11754145
    Abstract: A balance shaft includes an unbalanced shaft (3) comprising a bearing journal (8, 9), the periphery of which is merely partially cylindrical. The cylindrical partial periphery (10) of the bearing journal is oriented toward the shaft imbalance. The balance shaft also includes a needle roller cage assembly (15); and a bearing ring (13), which extends around the bearing journal, lies against the cylindrical partial periphery and forms the inner raceway of the needle roller cage assembly. The cage (27) of the needle roller cage assembly is designed to run on the end faces of the bearing ring axially on both sides by means of radially inwardly extending projections.
    Type: Grant
    Filed: November 12, 2019
    Date of Patent: September 12, 2023
    Assignee: Schaeffler Technologies AG & Co. KG
    Inventors: Hannes Schreyer, Stefan Dorn
  • Publication number: 20220010860
    Abstract: A balance shaft includes an unbalanced shaft (3) comprising a bearing journal (8, 9), the periphery of which is merely partially cylindrical. The cylindrical partial periphery (10) of the bearing journal is oriented toward the shaft imbalance. The balance shaft also includes a needle roller cage assembly (15); and a bearing ring (13), which extends around the bearing journal, lies against the cylindrical partial periphery and forms the inner raceway of the needle roller cage assembly. The cage (27) of the needle roller cage assembly is designed to run on the end faces of the bearing ring axially on both sides by means of radially inwardly extending projections.
    Type: Application
    Filed: November 12, 2019
    Publication date: January 13, 2022
    Inventors: Hannes Schreyer, Stefan Dorn
  • Patent number: 9938945
    Abstract: A plunger (1) for a high-pressure fuel pump is proposed, having a housing (2) which is similar to a tube and in the drive-side annular face (3) of which two flats (5) lie diametrically opposite one another which are indented from an outer shell (4) of the housing (2) and in which a pin (7) is mounted which supports a roller, wherein an inner shell (8) of the housing (2) is penetrated axially below the roller by a separate bridge piece (9), the lower face (10) of which acts as a rest for a pump piston in the case of an output-side annular face (11) of the housing (2), wherein the bridge piece (9) is fixed against rotation about an axial line of the housing (2) and is configured as a thick-walled longitudinal beam, with the result that an area (13) in the manner of a cylindrical segment remains between the longitudinal walls (12) of said longitudinal beam and the inner shell (8) of the housing (2), wherein, in order to fix the bridge piece (9) against rotation about the axial line of the housing (2), in the cir
    Type: Grant
    Filed: May 24, 2013
    Date of Patent: April 10, 2018
    Assignee: SCHAEFFLER TECHNOLOGIES AG & CO. KG
    Inventors: Stefan Dorn, Norbert Geyer
  • Patent number: 9599081
    Abstract: A tappet (1) for a fuel injection pump, having a tube-like housing (2), which accommodates a roller (4) for the running on a periodic lift generator inside the inner lateral surface (5) thereof in the region of a first ring end (3). This roller has axle stumps (7) projecting from the end faces (6) of the roller, by which stumps the roller sits in recesses (8) in the housing (2), wherein the housing (2) is penetrated axially by a bridge piece (9) underneath the roller (4), the underside (11) of which bridge piece, which faces a second ring end (10) of the housing (2), acts as a rest for a plunger following part.
    Type: Grant
    Filed: April 15, 2013
    Date of Patent: March 21, 2017
    Assignee: Schaeffler Technologies AG & Co. KG
    Inventors: Stefan Dorn, Norbert Geyer
  • Patent number: 9488223
    Abstract: A guide carriage for an elongated guide rail includes a main body, an end cap, and at least one row of rolling bodies accommodated in a continuous bypass channel. The end cap bears indirectly against a longitudinal end face of the main body and has a fastening bore through which a fastening screw passes. The fastening screw is screwed into the main body. The continuous bypass channel has a supporting portion and a return channel that are connected via a curved bypass channel that is arranged in the end cap. A lubricant flow path is arranged in the end cap and extends from a lubrication port to the row of rolling bodies. A first cavity is arranged between the fastening bore and the fastening screw. The first cavity forms a component of the lubricant flow path.
    Type: Grant
    Filed: May 27, 2015
    Date of Patent: November 8, 2016
    Assignee: Robert Bosch GmbH
    Inventors: Gerhard Roesch, Stefan Dorn, Martina Elting, Matthias Zeier, Juergen Schenk, Sebastian Schierling, Michael Korbacher, Gerd Spatschek, Wolfgang Kuellstaedt, Richard Kuehnlein
  • Patent number: 9482118
    Abstract: A tappet (1) having a tube-like housing (2), which in the region of one of the end faces (3) thereof receives a roller (5) running on a pin (4) and serving for contact with a periodic stroke generator. The pin (4) is mounted via the ends (6) thereof in a flat (8) that is indented from an outer surface (7) of the housing, wherein in the housing (2), axially beneath the roller (5), means (9) are provided for an at least indirect bearing of a tappet follower member. The housing (2) is formed of an extruded profile having profiling on the inner surface (10) of the housing (2), wherein, viewed in a circumferential direction of the housing (2), at least twothick-wall profile segments and two thin-wall profile segments (11, 12) are present. The thick-wall profile segments lie diametrically opposite each other and the thin-wall profile segments lie diametrically opposite each other, and the flat portions (8) are located in the thick-wall profiled segments (11).
    Type: Grant
    Filed: January 20, 2014
    Date of Patent: November 1, 2016
    Assignee: Schaeffler Technologies AG & Co. KG
    Inventors: Stefan Dorn, Norbert Geyer
  • Patent number: 9476451
    Abstract: A guide carriage is configured for use with an elongate guide rail. The guide carriage has at least one row of spherical rolling bodies which are received in an associated endless circulatory channel. The circulatory channel has a load-bearing section and a return channel which are connected to one another at their ends which lie opposite one another via in each case one curved deflection channel. The load-bearing section is delimited by a carriage raceway extending in a longitudinal direction on the guide carriage and a rail raceway on the guide rail. A separate main body of metal is also provided. The carriage raceway is arranged on a separate raceway insert which bears against the main body. A separate rolling-body guide part is also provided which has a guide section extending in the longitudinal direction. The guide section engages behind the raceway insert.
    Type: Grant
    Filed: May 28, 2015
    Date of Patent: October 25, 2016
    Assignee: Robert Bosch GmbH
    Inventors: Martina Elting, Juergen Schenk, Michael Korbacher, Stefan Dorn, Marco Stock, Mario Ziegler, Gerd Spatschek, Peter Schlegel
  • Patent number: 9410518
    Abstract: A tappet including a housing having a drive-side annular end face at which two flat sections, recessed in relation to an outer shell of the housing, lie diametrically opposite one another, and a bolt supporting a roller mounted in said sections is provided. A bridge section protrudes through an inner shell of the housing, and the output-side end face of said bridge section acts as a contact point for a tappet follower part, the bridge section lying against undersides of said flat sections and being held by a ring that is arranged in the inner shell, and sits in a groove of the inner shell so as not to protrude radially out of said groove, at least two tabs projecting radially inwards from an upper side of the ring, and the bridge section fixed thereupon in the direction of the output-side annular end face.
    Type: Grant
    Filed: November 18, 2013
    Date of Patent: August 9, 2016
    Assignee: Schaeffler Technologies AG & Co. KG
    Inventors: Norbert Geyer, Stefan Dorn
  • Patent number: 9404539
    Abstract: A guide carriage is configured for use with an guide rail. The guide carriage has at least one row of rolling bodies received in a circulatory channel. The circulatory channel has a load-bearing section and a return channel connected together at their ends by a deflection channel. The load-bearing section is delimited by a carriage raceway on the guide carriage and a rail raceway on the guide rail. At least one sealing lip is arranged in sealing engagement with the guide rail when the guide carriage is mounted on the guide rail. At least one separate rolling-body guide part, composed in one piece of an elastomer, has two deflection sections, between which at least one guide section, extending longitudinally, is arranged. An associated sealing lip is arranged on the guide section. At least one radially inner deflection surface of a deflection channel is arranged on each deflection section.
    Type: Grant
    Filed: May 28, 2015
    Date of Patent: August 2, 2016
    Assignee: Robert Bosch GmbH
    Inventors: Martina Elting, Matthias Zeier, Gerhard Roesch, Stefan Dorn, Juergen Schenk, Sebastian Schierling, Michael Korbacher, Gerd Spatschek, Wolfgang Kuellstaedt, Richard Kuehnlein
  • Patent number: 9291247
    Abstract: A roller tappet intended for use a) in a high pressure fuel pump; b) in a valve train of an internal combustion engine; c) in an engine such as an axial piston engine or a radial piston engine; or d) generally for a pump/compressor of an axial piston type or of a radial piston type.
    Type: Grant
    Filed: February 12, 2013
    Date of Patent: March 22, 2016
    Assignee: Schaeffler Technologies AG & Co. KG
    Inventors: Stefan Dorn, Norbert Geyer
  • Publication number: 20150361836
    Abstract: A tappet (1) having a tube-like housing (2), which in the region of one of the end faces (3) thereof receives a roller (5) running on a pin (4) and serving for contact with a periodic stroke generator. The pin (4) is mounted via the ends (6) thereof in a flat (8) that is indented from an outer surface (7) of the housing, wherein in the housing (2), axially beneath the roller (5), means (9) are provided for an at least indirect bearing of a tappet follower member. The housing (2) is formed of an extruded profile having profiling on the inner surface (10) of the housing (2), wherein, viewed in a circumferential direction of the housing (2), at least two thick-wall profile segments and two thin-wall profile segments (11, 12) are present. The thick-wall profile segments lie diametrically opposite each other and the thin-wall profile segments lie diametrically opposite each other, and the flat portions (8) are located in the thick-wall profiled segments (11).
    Type: Application
    Filed: January 20, 2014
    Publication date: December 17, 2015
    Applicant: Schaeffler Technologies AG & Co. KG
    Inventors: Stefan Dorn, Nobert Geyer
  • Publication number: 20150361937
    Abstract: The invention relates to a plunger (1) for a fuel injection pump, comprising a housing (2) that has a drive-side annular end face (3) at which two flat sections (5), recessed in relation to an outer shell (4) of the housing (2), lie diametrically opposite one another, a bolt (7) that supports a roller (6) being mounted in said sections.
    Type: Application
    Filed: November 18, 2013
    Publication date: December 17, 2015
    Applicant: Schaeffler Technologies AG & Co. KG
    Inventors: Nobert Geyer, Stefan Dorn
  • Publication number: 20150345553
    Abstract: A guide carriage is configured for use with an elongate guide rail. The guide carriage has at least one row of spherical rolling bodies which are received in an associated endless circulatory channel. The circulatory channel has a load-bearing section and a return channel which are connected to one another at their ends which lie opposite one another via in each case one curved deflection channel. The load-bearing section is delimited by a carriage raceway extending in a longitudinal direction on the guide carriage and a rail raceway on the guide rail. A separate main body of metal is also provided. The carriage raceway is arranged on a separate raceway insert which bears against the main body. A separate rolling-body guide part is also provided which has a guide section extending in the longitudinal direction. The guide section engages behind the raceway insert.
    Type: Application
    Filed: May 28, 2015
    Publication date: December 3, 2015
    Inventors: Martina Elting, Juergen Schenk, Michael Korbacher, Stefan Dorn, Marco Stock, Mario Ziegler, Gerd Spatschek, Peter Schlegel
  • Publication number: 20150345561
    Abstract: A guide carriage is configured for use with an guide rail. The guide carriage has at least one row of rolling bodies received in a circulatory channel. The circulatory channel has a load-bearing section and a return channel connected together at their ends by a deflection channel. The load-bearing section is delimited by a carriage raceway on the guide carriage and a rail raceway on the guide rail. At least one sealing lip is arranged in sealing engagement with the guide rail when the guide carriage is mounted on the guide rail. At least one separate rolling-body guide part, composed in one piece of an elastomer, has two deflection sections, between which at least one guide section, extending longitudinally, is arranged. An associated sealing lip is arranged on the guide section. At least one radially inner deflection surface of a deflection channel is arranged on each deflection section.
    Type: Application
    Filed: May 28, 2015
    Publication date: December 3, 2015
    Inventors: Martina Elting, Matthias Zeier, Gerhard Roesch, Stefan Dorn, Juergen Schenk, Sebastian Schierling, Michael Korbacher, Gerd Spatschek, Wolfgang Kuellstaedt, Richard Kuehnlein
  • Publication number: 20150345560
    Abstract: A guide carriage for an elongated guide rail includes a main body, an end cap, and at least one row of rolling bodies accommodated in a continuous bypass channel. The end cap bears indirectly against a longitudinal end face of the main body and has a fastening bore through which a fastening screw passes. The fastening screw is screwed into the main body. The continuous bypass channel has a supporting portion and a return channel that are connected via a curved bypass channel that is arranged in the end cap. A lubricant flow path is arranged in the end cap and extends from a lubrication port to the row of rolling bodies. A first cavity is arranged between the fastening bore and the fastening screw. The first cavity forms a component of the lubricant flow path.
    Type: Application
    Filed: May 27, 2015
    Publication date: December 3, 2015
    Inventors: Gerhard Roesch, Stefan Dorn, Martina Elting, Matthias Zeier, Juergen Schenk, Sebastian Schierling, Michael Korbacher, Gerd Spatschek, Wolfgang Kuellstaedt, Richard Kuehnlein
  • Publication number: 20150192098
    Abstract: A tappet (1) for a fuel injection pump, having a tube-like housing (2), which accommodates a roller (4) for the running on a periodic lift generator inside the inner lateral surface (5) thereof in the region of a first ring end (3). This roller has axle stumps (7) projecting from the end faces (6) of the roller, by which stumps the roller sits in recesses (8) in the housing (2), wherein the housing (2) is penetrated axially by a bridge piece (9) underneath the roller (4), the underside (11) of which bridge piece, which faces a second ring end (10) of the housing (2), acts as a rest for a plunger following part.
    Type: Application
    Filed: April 15, 2013
    Publication date: July 9, 2015
    Applicant: Schaeffler Technologies GmbH & Co. KG
    Inventors: Stefan Dorn, Norbert Geyer
  • Publication number: 20150159610
    Abstract: A plunger (1) for a high-pressure fuel pump is proposed, having a housing (2) which is similar to a tube and in the drive-side annular face (3) of which two flats (5) lie diametrically opposite one another which are indented from an outer shell (4) of the housing (2) and in which a pin (7) is mounted which supports a roller, wherein an inner shell (8) of the housing (2) is penetrated axially below the roller by a separate bridge piece (9), the lower face (10) of which acts as a rest for a pump piston in the case of an output-side annular face (11) of the housing (2), wherein the bridge piece (9) is fixed against rotation about an axial line of the housing (2) and is configured as a thick-walled longitudinal beam, with the result that an area (13) in the manner of a cylindrical segment remains between the longitudinal walls (12) of said longitudinal beam and the inner shell (8) of the housing (2), wherein, in order to fix the bridge piece (9) against rotation about the axial line of the housing (2), in the cir
    Type: Application
    Filed: May 24, 2013
    Publication date: June 11, 2015
    Applicant: Schaeffler Technologies GmbH & Co. KG
    Inventors: Stefan Dorn, Norbert Geyer
  • Publication number: 20150152826
    Abstract: A tappet (1) for a high-pressure fuel pump of an internal combustion engine is provided, having a tube-like housing (2), in the case of the drive-side annular face (3) of which two flat sections (5) are indented from an outer lateral surface (4) of the housing (2) lying diametrically opposite one another, in which flats a pin (7) is mounted which supports a roller (6), wherein, axially below the roller (6), an inner lateral surface (8) of the housing (2) is penetrated by a separate bridge piece (9), a driven-side end face (10) of which acts as a rest for a tappet follower part and which bears axially firstly in the direction of the drive-side annular face (3) against undersides (13) of the flat sections (5) and secondly in the direction of an output-side annular face (11) of the housing (2) by way of a securing ring (12) which is fixed on the inner shell (8), wherein the bridge piece (9) is held by the securing ring (12) such that it is clamped axially and radially without play in the housing (2).
    Type: Application
    Filed: May 23, 2013
    Publication date: June 4, 2015
    Applicant: Schaeffler Technologies GmbH & Co. KG
    Inventors: Stefan Dorn, Norbert Geyer
  • Patent number: 8875676
    Abstract: A roller tappet (1) is proposed for a high-pressure fuel pump of an internal combustion engine, having a housing (2), in the case of the drive-side end (3) of which two surfaces (5) which lie diametrically opposite one another and are depressed by an outer shell (4) of the housing (2) are applied with in each case one receptacle (6), in which surfaces (5) a pin (8) is mounted which carries a cam roller (7), wherein an inner shell (9) of the housing (2), axially below the cam roller (7) as viewed in the direction remote from the drive, is penetrated by a bridge piece (10), the output-side end (11) of which has a rest (12) for a tappet following part, wherein the outer shell (4) of the housing (2) which is non-stepped as least as far as possible apart from the surfaces (5) is provided as a closed circumferential ring (14), as viewed in the drive direction immediately above upper sides (13) of the surfaces (5), which upper sides (13) run through the housing (2) in the manner of chords, which closed circumferenti
    Type: Grant
    Filed: April 20, 2011
    Date of Patent: November 4, 2014
    Assignee: Schaeffler Technologies GmbH & Co. KG
    Inventors: Norbert Geyer, Stefan Dorn
  • Patent number: 8863716
    Abstract: The invention relates to a tappet (1) for a high-pressure fuel pump or for a valve drive of an internal combustion engine, comprising a housing (2) which has a cam run-on surface (4) on the drive side (3) thereof, wherein an output side (5) of the housing (2) rests on a lower face (6) of a bridge piece (8) that projects through an inner shell (7) of the housing (2), wherein an anti-turn lug (11) protrudes from the outer shell (10) of the housing (2) and is arranged in a window (9) in the latter, wherein said lug is substantially present as an upright body similar to a semi-cylinder in the region thereof protruding from the housing (2), and the outer surface (15) of said lug, in cross section, results in an ogival curve made up of two or more circular arcs (16).
    Type: Grant
    Filed: May 16, 2011
    Date of Patent: October 21, 2014
    Assignee: Schaeffler Technologies GmbH & Co. KG
    Inventors: Stefan Dorn, Norbert Geyer, Karsten Kucht