Patents by Inventor Johann Kramer

Johann Kramer 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).

  • Publication number: 20060008354
    Abstract: The invention relates to a high-speed impeller for delivering gaseous or liquid media, for example as a compressor wheel for an exhaust-gas turbocharger. The high-speed impeller has a reinforcing core structure and an outer functional section. The invention is distinguished by the fact that reinforcing sleeves are pushed concentrically over one another for producing the core structure, in which case the length of the respective reinforcing sleeves varies. Furthermore, the functional section is cast onto the core structure.
    Type: Application
    Filed: September 3, 2004
    Publication date: January 12, 2006
    Inventors: Johann Kramer, Martin Schlegl, Erwin Schmidt, Holger Stark, Siegfried Sumser
  • Patent number: 6902324
    Abstract: A crankshaft bearing shell in an internal combustion engine of a vehicle is made from a steel/aluminum composite material and is composed of a steel supporting layer and an aluminum plated sliding layer containing parts of tin and copper in the aluminum sliding layer, optionally comprising an intermediate layer consisting of pure aluminum. The aluminum sliding layer comprises A1Sn (20-23) Cu(1.8-2.3) alloy, optionally containing additions of up to 0.1 wt % of Ni, 0.7 wt % of Si, 0.7 wt % Fe, 0.7 wt % Mn, 0.2 wt % Ti, wherein the sum of Si, Fe and Mn is less than 1 wt %; and impurities form a total amount of less than 0.5 wt.- % with the aluminum sliding layer having a Brinell hardness of at least 45 HB 1/5/30 after heat treatment.
    Type: Grant
    Filed: November 15, 2001
    Date of Patent: June 7, 2005
    Assignee: KS Gleitlager GmbH
    Inventors: Thomas Steffens, Werner Schubert, Klaus Deicke, Johann Krämer, Jürgen Claus
  • Publication number: 20040101218
    Abstract: The invention relates to a crankshaft bearing shell in an internal combustion engine of a vehicle. Said crankshaft bearing shell is made of a steel/aluminum composite material and is composed of a steel supporting layer and an aluminum plated sliding layer containing parts of tin and copper in the aluminum sliding layer, optionally comprising an intermediate layer consisting of pure aluminum. Said aluminum sliding layer comprises A1Sn (20-23) Cu(1.8-2.3) alloy, optionally containing additions of up to 0.1 wt % of Ni, 0.7 wt % of Si, 0.7 wt % Fe, 0.7 wt % Mn, 0.2 wt % Ti, wherein the sum of Si, Fe and Mn is less than 1 wt %; and impurities form a total amount of less than 0.5 wt.- % with said aluminum sliding layer having a Brinell hardness of at least 45 HB 1/5/30 after heat treatment.
    Type: Application
    Filed: April 10, 2003
    Publication date: May 27, 2004
    Inventors: Thomas Steffens, Werner Schubert, Klaus Deicke, Johann Kramer, Jurgen Claus
  • Patent number: 6523343
    Abstract: An air gap insulated exhaust manifold for an internal combustion engine of a motor vehicle that has a catalytic converter. The exhaust manifold includes an inner pipe and an outer pipe with a connecting flange on the cylinder head side of the outer pipe. The outer pipe encloses the inner pipe and is spaced therefrom at a distance. A pipe end of the inner pipe protrudes in a guided manner into the cylinder head and only the outer pipe is fastenable to the cylinder head by way of the connecting flange.
    Type: Grant
    Filed: November 1, 2001
    Date of Patent: February 25, 2003
    Assignee: DaimlerChrysler AG
    Inventors: Gerd Dürr, Johann Krämer, Martin Schlegl, Gerd Tiefenbacher
  • Publication number: 20020059795
    Abstract: An air gap insulated exhaust manifold for an internal combustion engine of a motor vehicle that has a catalytic converter. The exhaust manifold includes an inner pipe and an outer pipe with a connecting flange on the cylinder head side of the outer pipe. The outer pipe encloses the inner pipe and is spaced therefrom at a distance. A pipe end of the inner pipe protrudes in a guided manner into the cylinder head and only the outer pipe is fastenable to the cylinder head by way of the connecting flange.
    Type: Application
    Filed: November 1, 2001
    Publication date: May 23, 2002
    Inventors: Gerd Durr, Johann Kramer, Martin Schlegl, Gerd Tiefenbacher
  • Patent number: 6375158
    Abstract: A fastening device for connecting a valve spring retainer to a valve stem has a clamping sleeve, which acts radially on the valve stem and which blocks the valve spring retainer axially against the force of a valve spring on the valve stem, with the valve spring retainer being held displaceably on the valve stem. In order to provide a fastening device between a valve spring retainer and a valve stem of an internal combustion engine that is functionally dependable over a long operating period and is easy to assemble and disassemble, it is provided that the valve stem has, at least in the region of the clamping sleeve, a continuous cylindrical circumferential surface and that the clamping sleeve consists of a shape memory alloy.
    Type: Grant
    Filed: February 17, 2000
    Date of Patent: April 23, 2002
    Assignee: DaimlerChrysler A.G.
    Inventors: Johann Krämer, Jörg Rossow
  • Patent number: 6174008
    Abstract: bumper arrangement for a motor vehicle includes a bumper mounted in such a way that it can be moved between a rest position and an operating position. A spring acts on the bumper and is prestressed in the rest position. A locking device holds the bumper in the rest and/or operating position. A control unit actuates the locking device as a function of signals from an accident detection sensor system. When the locking device is unlocked, the spring moves the bumper abruptly into the operating position in which the bumper absorbs impact loads resulting from relative velocities up to a predetermined limit in a substantially elastic manner.
    Type: Grant
    Filed: October 13, 1999
    Date of Patent: January 16, 2001
    Assignee: DaimlerChrysler AG
    Inventors: Johann Kramer, Bernd Schroder, Martin Tebbe
  • Patent number: 5687958
    Abstract: A damping body for damping periodically alternating loads uses a shape-memory alloy material to govern the damping. The damping body is sintered from metal grains or is laminated from a plurality of perforated sheet-metal layers. The individual sheet-metal layers are orientated transversely or parallel to the loading direction and are connected to one another over the full surface area. A combination formed from a multiplicity of round pins orientated parallel to the loading direction and having enclosed gussets can also be used as a damping body. A certain hollow-space portion inside the damping body can also be created by drilling, slitting or grooving. The proportion of the open pore or bore volume of the damping body to the total volume is at least 5%, preferably about 15 to 40%.
    Type: Grant
    Filed: August 28, 1992
    Date of Patent: November 18, 1997
    Assignee: Mercedes-Benz AG
    Inventors: Rainer Renz, Johann Kramer
  • Patent number: 5398916
    Abstract: A metallic damping body for damping shock-type and/or periodically changing stresses, consists of a shape-memory alloy material for effecting the damping. In order to be able to achieve a high damping effect even under a high mechanical stress on the damping body, the shape-memory alloy is selected such that it is in a state of austenitic microstructure at the operating temperature of the damping body. A sufficiently high mechanical prestress is applied to the damping body so that the damping working range is within the range of the pseudoelastic strain which starts below the proportionality limit in the stress/strain diagram of the shape-memory alloy. When the damping body is compressively stressed, a multiplicity of closely adjacent, small, uniformly distributed voids are present in the interior thereof, which together make up at least about 5%, preferably about 15 to 40%, of the total volume of the damping body.
    Type: Grant
    Filed: August 17, 1993
    Date of Patent: March 21, 1995
    Assignee: Mercedes-Benz AG
    Inventors: Johann Kramer, Rainer Renz, Martin Schlegl
  • Patent number: 5277435
    Abstract: A cylindrical standard shank is provided for rotating cutting tools for locating a standard shank in a cylindrical location opening, precisely produced with regard to shape and true-running accuracy, in the work spindles of so-called transfer lines or of, for example, steep-taper adaptors. The cutting tool is, in turn, fixed by a cylindrical press connection in the standard shank serving as an adaptor between the tool shank and standardized location opening. The standard shank has, at the front, a longitudinally slotted clamping sleeve accurately machined on the inside and outside. The clamping sleeve is clamped by an accurately machined shrink collar of shape-memory alloy which is approximately the same length and has at least the same wall thickness, is present in the austenitic structural state at room temperature and in the process is reduced in diameter on account of suitable pretreatment, and bears tightly against the periphery of the clamping sleeve.
    Type: Grant
    Filed: August 24, 1992
    Date of Patent: January 11, 1994
    Assignee: Mercedes-Benz AG
    Inventors: Johann Kramer, Bruno Teusch, Rainer Renz, Dieter Jenuwein
  • Patent number: 5197720
    Abstract: The invention concerns a clamping tool for non-positive and high-precision clamping of workpieces by means of an expansion element, which is held inside the clamping tool and, in the unclamped state, is matched to the workpiece with little play but movably, and to which force may be applied radially over a large area. When force is applied, the expansion element expands reversibly, and bears non-positively against the workpiece, and holds it in place with high rotational accuracy and high clamping force. In order to be able to permit a high expansion rate of the expansion element in conjunction with a closed configuration of the latter, the invention proposes for the expansion element a so-called shape memory alloy, which is operated in the austenitic state with reversible stress-inducible possibility of change of the microstructure into the martensitic state.
    Type: Grant
    Filed: March 22, 1990
    Date of Patent: March 30, 1993
    Assignee: Daimler-Benz AG
    Inventors: Rainer Renz, Johann Kramer
  • Patent number: 5069179
    Abstract: An internal combustion engine is described which comprises a main combustion chamber and a secondary combustion chamber which is arranged in the cylinder head of the internal combustion engine and is connected via a shot channel to the main combustion chamber. To increase the high-temperature stability, the parts of the secondary combustion chamber which are acted upon by the hot gas jet are made of a material of intermetallic phase.
    Type: Grant
    Filed: October 25, 1999
    Date of Patent: December 3, 1991
    Assignee: Mercedes-Benz AG
    Inventors: Johann Kramer, Rainer Renz