Patents Assigned to Pierburg AG
  • Patent number: 6176689
    Abstract: An electrically driven air pump has a housing, in which an electric motor and a pump mechanism are arranged, the pump mechanism having at least one impeller with a multiple number of impeller channels. The housing has an annular channel, which connects to a discharge member. The annular channel is closed to the impeller channels by a cam disk which has a recess in its periphery to provide a defined opening for smooth passage of air from the impeller channels to the annular channel.
    Type: Grant
    Filed: November 24, 1999
    Date of Patent: January 23, 2001
    Assignee: Pierburg AG
    Inventors: Andreasl Bumbel, Rheinhard Debus
  • Patent number: 6039536
    Abstract: An improvement in an electrical air pump having a housing with a pump mechanism at one end and an electric motor at the other end. The pump mechanism has at least one lightweight pump impeller made of plastic whose hub is press-fit on a shaft of the electric motor. The hub is provided with a plurality of grooves distributed around a bore in the hub which receives the motor shaft. The grooves form spaces between an inner surface of the hub and an outer surface of the shaft and the spaces are filled with an adhesive to bond the hub to the shaft. The grooves extend longitudinally or spirally along the entire length of the hub. The grooves are relatively shallow and have a depth of approximately 0.05 mm.
    Type: Grant
    Filed: September 30, 1998
    Date of Patent: March 21, 2000
    Assignee: Pierburg AG
    Inventors: Gunter Van De Venne, Frank Kemmerling, Michael Bonse, Klaus Muckelmann, Rainer Peters
  • Patent number: 6036456
    Abstract: An electrical air pump adapted for being periodically turned on and off and reversed in pumping direction. The air pump includes an electric motor adapted for electronic control and an air pump section joined by a housing as a common system. The housing has a cylindrical wall defining a first chamber in which the stator system is received and a scaling cover is engaged with the housing to seal the first chamber. The air pump section includes a pump cover sealingly engaged with the housing and defining therewith a second chamber, the rotor being of bell shape and rotatably supported in the second chamber on a pin secured in the housing and in the pump cover. The rotor is disposed with slight clearance adjacent to an end wall of the housing and the rotor projects radially beyond the cylindrical wall. The rotor has a collar and a plurality of pumping blades extending radially from the collar into an annular pumping channel of the second chamber.
    Type: Grant
    Filed: September 16, 1998
    Date of Patent: March 14, 2000
    Assignee: Pierburg AG
    Inventors: Rainer Peters, Gunter Van De Venne, Michael Bonse, Klaus Muckelmann
  • Patent number: 5996551
    Abstract: A spring assembly in a throttle valve connection for control of combustion air to an internal combustion engine, in which a rotor is movable in opposite directions to control flow of combustion air. The spring assembly has a coil spring with first and second legs at respective opposite ends engaging housing and rotor parts. The housing and rotor parts are provided with respective oblique surfaces engaging one of the legs of the spring when the spring is relaxed to resist relative rotation of the housing and rotor.
    Type: Grant
    Filed: August 12, 1998
    Date of Patent: December 7, 1999
    Assignee: Pierburg AG
    Inventor: Thomas Schroder
  • Patent number: 5975062
    Abstract: A method and apparatus for periodically air-washing a charcoal canister and for testing leak-tightness of a closed fuel supply system of an internal combustion engine in which a reversible electric air pump is installed in a line connecting the fuel system and the canister to the intake manifold of the engine upstream of the choke valve. In one direction of operation of the pump, ambient air is sucked through the canister and fed to the intake manifold to wash the canister and in the other direction of operation of the pump, air is pumped from above the choke valve in the intake manifold to the fuel system to pressurize the system to check leak-tightness thereof. When the engine is turned off, the pump is shut off and the fuel supply system is connected to the canister.
    Type: Grant
    Filed: March 11, 1998
    Date of Patent: November 2, 1999
    Assignee: Pierburg AG
    Inventors: Michael Bonse, Gunter Van De Venne
  • Patent number: 5969617
    Abstract: A flame ionization detector having a pair of spaced electrodes to which a DC voltage is applied and a flame produced between the electrodes by burning a gas whose composition is to be determined, thereby ions are produced which form an ion current between the electrodes which is representative of the gas composition to be measured. The flame detector is formed by a base plate having a first channel for inlet of the gas whose composition to be measured, a second channel for inlet of a combustion gas, a third channel connected to the first and second channels for conveying a mixture of the gases to an outlet communicating with a nozzle outlet in a ceramic plate on the base plate which faces an opening in a metal plate spaced at a predetermined distance from the ceramic plate such that the flame burns in the opening in the metal plate. An electrically conductive metal layer is disposed on the ceramic plate around the nozzle outlet therein.
    Type: Grant
    Filed: November 10, 1998
    Date of Patent: October 19, 1999
    Assignee: Pierburg AG
    Inventor: Christopher Garthe
  • Patent number: 5852227
    Abstract: Apparatus for the measurement of components of exhaust gas of an internal combustion engine in a flame ionization chamber to which the exhaust gas, combustion gas and combustion air are supplied and in which the gas components in the exhaust gases are measured. The apparatus comprises three connection lines respectively for receiving the exhaust gas, combustion gas and combustion air for supplying these to the flame ionization detector. A separate control line is provided containing a pressure controller and an outlet nozzle body which opens to ambient atmosphere. The control line has a section between the pressure controller and the outlet nozzle body. Each connection line has inlet and outlet flow adjusters defining a respective section therebetween. At least two further lines connect the sections of two of the connection lines to the section of the control line.
    Type: Grant
    Filed: May 27, 1997
    Date of Patent: December 22, 1998
    Assignee: Pierburg AG
    Inventor: Christopher Garthe
  • Patent number: 5826554
    Abstract: A valve is installed in an opening provided in a thin wall of an air intake pipe, which supplies combustion air from a flow control device to a cylinder of an internal combustion engine, to relieve excess pressure in the pipe. The valve includes a socket connected to a segment of the air intake pipe, and an elastomer, umbrella valve member is supported in the socket to normally cover the opening in the pipe and to undergo deformation when the pressure in the pipe reaches a predetermined value to uncover the opening and to connect the interior of the pipe to the ambient atmosphere.
    Type: Grant
    Filed: June 27, 1997
    Date of Patent: October 27, 1998
    Assignee: Pierburg AG
    Inventors: Hans-Ulrich Kuhnel, Franz Dellen
  • Patent number: 5797727
    Abstract: An electrically driven air pump having a housing containing a pump unit driven from a shaft of an electric motor, the pump unit including two impellers made of plastic having hubs which are press-fit on the shaft of the electric motor. A collar is also press-fit on the shaft and abutting against the hub of one impeller on a side thereof facing the electric motor, and a lock ring made of metal is press-fit on the shaft and abuts against the hub of the other impeller on a side thereof facing away from the electric motor thereby to clamp the impellers between the collar and the lock ring. The lock ring and the hub of the adjoining impeller are formed at their mutually abutting surfaces with a tooth and groove arrangement to prevent relative rotary movement therebetween. A similar tooth and groove arrangement can be provided between the abutting surfaces of the impellers and between the abutting surfaces of the collar and the adjoining impeller.
    Type: Grant
    Filed: March 21, 1997
    Date of Patent: August 25, 1998
    Assignee: Pierburg AG
    Inventors: Rainer Peters, Michael Bonse, Gunter van de Venne
  • Patent number: 5785013
    Abstract: A pump-motor unit for pumping a coolant for cooling an internal combustion engine in which a centrifugal pump is connected to an electrically commutated d.c. motor to be driven thereby. A power electronic circuit is mounted on a plate and installed in the unit in connection with the d.c. motor to operate the motor in accordance with signals delivered to said power electronic circuit from an external power source. A cooling body is supported in the unit to cool the power electronic circuit by transferring heat from the power electronic circuit to the coolant. The centrifugal pump and the d.c. motor are interconnected through the cooling body.
    Type: Grant
    Filed: December 5, 1996
    Date of Patent: July 28, 1998
    Assignee: Pierburg AG
    Inventors: Walther Sinn, Frank Langner, Wolfgang Weller, Wolfgang Zacher, Jens Teubel, Ronald Rathke
  • Patent number: 5779463
    Abstract: A rotary piston pump in which a slide valve has a pivot bearing at each of its ends which supports a sliding block and wherein a theoretical slide valve length in the position in which the axes of symmetry of the shell rotor and slide valve are superimposed, is equal to the sum of the length along the slide valve measured between the pivot bearings plus two times the thickness of a sliding block measured between its pivot bearing and the wall of the shell. The sliding blocks have an outer surface with a curvature between the curvature of the outer surface of the rotor and the maximum curvature of the wall of the shell.
    Type: Grant
    Filed: July 14, 1995
    Date of Patent: July 14, 1998
    Assignee: Pierburg AG
    Inventors: Helmut Rossel, Martin Krucinski, Rainer Strauss, Ulrich Flesch, Dieter Jelinek
  • Patent number: 5765435
    Abstract: A fuel level indicator is mounted on a casing (2) in a fuel tank (1) and includes a float lever (6) connected to a lever arm (17), the float lever (6) having an elbow portion (16) passing through an opening (18) in lever arm (17) and projecting into a hole (15) in a holder (9) for rotation therein. At its lower edge (19) the lever arm (17) engages a collar (20) of holder (9) and at its upper edge (21) the lever arm (17) engages a collar (22) of holder (9). In this way, the lever arm (17), and thereby float lever (6), is guided radially and axially on the holder (9). The float lever (6) is releasably secured to the lever arm (17) by resilient snap tabs (23). Accordingly, precise support of the float lever is obtained with a simple construction and with easy assembly and disassembly of the float lever.
    Type: Grant
    Filed: October 27, 1995
    Date of Patent: June 16, 1998
    Assignees: Pierburg AG, Preh-Werke GmbH & Co. KG
    Inventors: Norbert Grotschel, Horst Breuer, Oswald Reuss
  • Patent number: 5765535
    Abstract: A fuel supply system for an internal combustion engine in which an electrical fuel pump pumps fuel from a fuel tank to a fuel distributor and a pressure switch is connected to respond to the pressure of the fuel. The pressure switch is electrically connected to connect and disconnect electrical power supply to the fuel pump as a function of lower and upper threshold values of pressure of the pumped fuel. The pressure switch contain a storage chamber which stores fuel when the fuel pump is operative andwhen the pump is disconnected, the storage chamber supplies the stored fuel to the full distributor with no back flow to the fuel tank. A pressure reducing regulator is located between the pressure switch and the fuel distributor to reduce the pressure of the fuel supplied to the distributor to a value lower than the pressure of the fuel at the pressure switch.
    Type: Grant
    Filed: March 20, 1996
    Date of Patent: June 16, 1998
    Assignee: Pierburg AG
    Inventor: Bernhard Radermacher
  • Patent number: 5711652
    Abstract: An electrically driven air pump having a pump mechanism in a first section of a housing and an electric motor in a second section of the housing in driving engagement with the pump mechanism. First and second end covers are sealingly secured on the housing. The electric motor is supported by elastomer rings in the housing. The pump mechanism has two axially spaced rotor wheels secured on the drive shaft of the motor and a stator wheel between the rotor wheels. The electric motor is balanced, in situ, in its mounted state by adjusting that one of the rotor wheels which is exposed in the housing prior to installation of the end cover on the first section of the housing. After the motor is balanced, the end cover is press fit on the housing and stator wheel to form air-tight, friction fit seal joints therebetween in which the engaged parts which are deformed elastically or plastically.
    Type: Grant
    Filed: October 30, 1995
    Date of Patent: January 27, 1998
    Assignee: Pierburg AG
    Inventors: Gunter Van De Venne, Rainer Peters, Klaus Muckelmann
  • Patent number: 5706785
    Abstract: A fuel supply system for an internal combustion engine in which a fuel pump pumps fuel from a fuel tank to a fuel distributor and a pressure regulator is connected between the fuel pump and the fuel distributor to respond to pressure of the fuel pumped by the fuel pump, to return fuel back to the fuel tank as a function of the pressure of the pumped fuel, a pressure reducer being disposed between the pressure regulator and the fuel distributor to reduce the pressure of the fuel delivered to the fuel distributor to a value lower than the pressure of the fuel at the pressure regulator.
    Type: Grant
    Filed: March 25, 1996
    Date of Patent: January 13, 1998
    Assignee: Pierburg AG
    Inventors: Bernhard Radermacher, Henning Garcke, Heinz Beier
  • Patent number: 5701874
    Abstract: A control valve for the recycling of exhaust gas from an exhaust gas channel to an air inlet channel of the engine, wherein a valve member of the valve opens and closes a valve opening between the exhaust gas channel and the air inlet channel. An electromagnetic control unit acts on the valve member to open the valve and a spring biasses the valve to a closed state. The valve member has a closure portion for closing the valve and is formed with a balancing section spaced from the closure portion and formed with a cross-sectional area equal to that of the closure portion so that the air pressure in the inlet channel applies equal and opposite forces on the balancing section and the closure portion whereby the valve is balanced and not subject to pressure variations in the air inlet channel, such as due to turbocharging.
    Type: Grant
    Filed: April 17, 1996
    Date of Patent: December 30, 1997
    Assignee: Pierburg AG
    Inventors: Osman Sari, Helmut Blank