Patents by Inventor Günter Lewentz

Günter Lewentz 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: 6194812
    Abstract: A device for transmitting a deflection of a piezoelectric actuator to a movable tappet includes a pressure chamber between the piezoelectric actuator and the tappet. The pressure chamber is substantially formed by two mutually parallel diaphragms having effective radii of different lengths. The diaphragm with the longer radius is associated with the piezoelectric actuator and the diaphragm with the shorter radius is associated with the tappet. Therefore, upon a deflection of the first diaphragm by the piezoelectric actuator, the second diaphragm is deflected by a greater distance toward the tappet. A controller with an actuator having a controllable length is also provided.
    Type: Grant
    Filed: March 30, 1999
    Date of Patent: February 27, 2001
    Assignee: Siemens Aktiengesellschaft
    Inventors: Wendelin Klügl, Hinrich Krüger, Johannes Fitzner, Raimondo Giavi, Karl Kirchweger, Jürgen Rink, Gerd Schmutzler, Stefan Lehmann, Dirk Baranowski, Günter Lewentz
  • Patent number: 6152111
    Abstract: The invention proposes a fuel injection valve for internal combustion engines, having a valve member (11), which can be displaced axially outward in a bore (9) of a valve body (1) counter to the force of a closing spring (47) and which on its end toward the combustion chamber has a closing head (13), protruding from the bore (9) and forming a valve closing member, that on its side toward the valve body (1) has a valve sealing face (15) with which it cooperates with a valve seat face (17) disposed on the end of the valve body (1) toward the combustion chamber, and having at least one injection opening on the closing head (13) which originates at a pressure chamber (19) and whose outlet opening is covered by the valve body (1) in the closing position of the valve member (11) and is uncovered in the outward-oriented opening stroke.
    Type: Grant
    Filed: May 9, 1997
    Date of Patent: November 28, 2000
    Assignee: Robert Bosch GmbH
    Inventors: Detlev Potz, Guenter Lewentz, Uwe Gordon
  • Patent number: 5823161
    Abstract: A fuel injection device for internal combustion engines, having a high-pressure fuel pump, which pumps fuel from a low-pressure chamber via a feed line into a high-pressure collection chamber that communicates via high-pressure lines with the individual injection valves that protrude into the combustion chamber of the engine to be supplied. In order for this system to make variable injection cross sections at the injection valves possible, these injection valves are embodied as injection valves with an outward-opening valve member, via whose controllable opening stroke motion in the direction of the combustion chamber, a variable injection cross section can be adjusted at the injection valve.
    Type: Grant
    Filed: February 25, 1997
    Date of Patent: October 20, 1998
    Assignee: Robert Bosch GmbH
    Inventors: Detlev Potz, Guenter Lewentz, Ralf Maier, Stefan Kampmann, Uwe Gordon, Andreas Kreh, Nestor Rodriguez-Amaya
  • Patent number: 5788161
    Abstract: A fuel injection nozzle for internal combustion engines has a holding body with a protruding fixed nozzle needle whose terminal portion, has a valve cone, an annular valve diaphragm cooperates in valve-like fashion. The valve diaphragm is fastened by its outer peripheral portion against the holding body with a union nut, and the edge surrounding the opening is resiliently pressed with initial tension against the valve cone. In order to keep the strains occurring in the stroke, generated by bending, of the valve diaphragm low over its entire region, the valve diaphragm has a bulge oriented counter to the stroke direction. The bulge is preferably composed of an annular region of steep slope (.alpha.) adjoining the fastened outer peripheral region, and an annular region of flat slope (.beta.) extending from it toward the opening. The bulge may also be conical or dome-shaped.
    Type: Grant
    Filed: December 15, 1995
    Date of Patent: August 4, 1998
    Assignee: Robert Bosch GmbH
    Inventors: Detlev Potz, Guenter Lewentz, Uwe Gordon, Stefan Haug
  • Patent number: 5758829
    Abstract: A fuel injection valve for internal combustion engines with a valve member which is displaced in a bore in a valve body by the fuel pressure, counter to the action of a closing spring. The valve body has at a combustion-space end, a valve head which on a side which faces the valve body is arranged a sealing surface which interacts with a valve seat provided on the combustion-space end of the valve body, forming a sealing cross section, and including injection apertures which permit a flow of fuel from a pressure space in the valve body to the combustion space of the internal combustion engines and has an aperture cross section which can be varied as a function of the stroke of the valve member.
    Type: Grant
    Filed: November 9, 1995
    Date of Patent: June 2, 1998
    Assignee: Robert Bosch GmbH
    Inventors: Katsuoki Itoh, Christoph Treutler, Guenter Lewentz, Bernd Dittus, Gilbert Moersch, Christoph Franke, Reiner Schuetz, Hans-Friedemann Kober
  • Patent number: 5755385
    Abstract: A fuel injection valve for internal combustion engines, with an outward-opening valve member which, at one end projects out of a guide bore in a valve body. The valve has a valve head which acts as a closing member and on which is arranged a sealing face that cooperates with a valve seat on the valve body and which forms a sealing edge. For a variable injection cross section, a sleeve is attached onto the valve member on the region of the valve member located near the valve-member head, in which sleeve are provided a plurality of rows of injection orifices which can be opened in succession with an increasing opening stroke of the valve member. In order to allow a reliable and sealing guidance of the valve member, an inflow duct to the injection orifices is designed as a recess in the valve-member shank, in such a way that a web region guiding and sealing off the valve member in the sleeve remains.
    Type: Grant
    Filed: November 29, 1995
    Date of Patent: May 26, 1998
    Assignee: Robert Bosch GmbH
    Inventors: Detlev Potz, Guenter Lewentz, Uwe Gordon
  • Patent number: 5738283
    Abstract: The invention sets forth a fuel injection valve for internal combustion engines, having a valve body and an expansion sleeve that cooperates with the valve body. A pressure chamber is defined between the expansion sleeve and the valve body into which a high-pressure conduit discharges which can be made to communicate with an injection cross section into the combustion chamber of the engine via an opening cross section, openable at high pressure, between the expansion sleeve and the valve body. The cup-shaped expansion sleeve is slipped onto the circumferential jacket face of the valve body and braced axially against the valve body; a portion of the expansion sleeve is embodied as a fastening element on the valve body.
    Type: Grant
    Filed: September 30, 1996
    Date of Patent: April 14, 1998
    Assignee: Robert Bosch GmbH
    Inventors: Detlev Potz, Guenter Lewentz, Uwe Gordon, Stefan Haug, Christian Schmeisser
  • Patent number: 5522550
    Abstract: A fuel injection nozzle for internal combustion engines has a nozzle body and an outward-opening valve needle with a closing head. To produce tightly focused injection streams, the closing head has, in addition to a valve cone that cooperates with a valve seat on the nozzle body, a piston acted upon by fuel, with a jacket cut away by means of a recess and pierced by openings. The discharge orifice of the openings is axially offset from the valve cone, so that the injection cross sections, which are elongated and axially parallel, are not opened up by a control edge on the valve seat until after an idle stroke. A relief groove between the valve cone and the piston of the closing head assures a defined contact of the valve cone with the valve seat.
    Type: Grant
    Filed: December 12, 1994
    Date of Patent: June 4, 1996
    Assignee: Robert Bosch GmbH
    Inventors: Detlev Potz, Guenter Lewentz, Uwe Gordon
  • Patent number: 5497947
    Abstract: A fuel injection nozzle for internal combustion engines that has a nozzle body with a valve seat disposed on the combustion chamber end and an outwardly-opening valve needle with a closing head, which has a closing cone that works together with the closing valve seat. At least one injection port is disposed in the closing head at an angle with respect to the axis of reciprocation of the valve needle, and is opened by a control edge on the nozzle body depending on the inlet pressure of the fuel. In order to minimize any deflection of the injection stream flowing out of the injection port relative to the alignment of the injection port, the port is divided into at least two parallel conduits, which are separated from each other by a dividing wall and which upon the opening stroke of the valve needle are unblocked one after the other by the control edge.
    Type: Grant
    Filed: August 24, 1994
    Date of Patent: March 12, 1996
    Assignee: Robert Bosch GmbH
    Inventors: Detlev Potz, Guenter Lewentz, Uwe Gordon
  • Patent number: 5482018
    Abstract: A fuel injection nozzle for internal combustion engines with direct injection including a nozzle body and an outward-opening valve needle with a closing head, in which outward-oriented injection ports are disposed. In order to form exact oriented fuel streams from the injection onset on, the cross section of the stream is controlled by the valve needle as a function of its stroke. The injection ports have a sharp control edge with a sharp control edge on the nozzle body which determines the injection cross section, and a sealing seat line formed by a hollow frustoconical valve seat on the nozzle body and a frustoconical valve cone on the nozzle needle, with a radially inner annular edge. The annular edge is disposed on an annular body secured to the valve needle and is aligned with the control edge of the injection ports in the injection direction of the injection ports. The annular body is secured to the end of the nozzle needle toward the combustion chamber either nonpositively or positively.
    Type: Grant
    Filed: December 12, 1994
    Date of Patent: January 9, 1996
    Assignee: Robert Bosch GmbH
    Inventors: Detlev Potz, Theodor Duetsch, Guenter Lewentz, Uwe Gordon
  • Patent number: 5405088
    Abstract: A fuel injection nozzle for internal combustion engines having a nozzle body with a valve seat disposed on a side of the combustion chamber of the internal combustion engine and an outwardly opening needle valve with a closing head that has a closing cone that cooperates with the valve seat. At least one outwardly oriented injection hole is disposed in the closing head that is supplied with fuel via a supply conduit from a pressure chamber. The supply conduit is oriented axially with respect to the injection hole and changes over into this injection hole in a funnel shape. Its width corresponds approximately to the length of the injection hole. The injection hole and supply conduit extend at an acute angle a to the longitudinal axis of the closing head that is adapted to the combustion chamber of the internal combustion engine. The intake of the supply conduit is located in a face end of the closing head remote from the end on the side of the combustion chamber.
    Type: Grant
    Filed: January 3, 1994
    Date of Patent: April 11, 1995
    Assignee: Robert Bosch GmbH
    Inventors: Uwe Gordon, Guenter Lewentz, Detley Potz
  • Patent number: 5265808
    Abstract: A fuel-injection nozzle for internal combustion engines having plurality of lip elements on a nozzle tube, the edges are adjacent to each other. The lip elements form an obtuse cone and are held together under a high pre-stressing pressure by a clamping sleeve and an end cap. Pressure build-up in the interior chamber of the nozzle tube elastically expands the lip edges, in which case gaps are created, which form flat spray streams through which fuel is sprayed into the combustion chamber of the engine. When the fuel pressure in the interior chamber subsides the lip edges close to prevent any dirt from entering the slits.
    Type: Grant
    Filed: November 19, 1992
    Date of Patent: November 30, 1993
    Assignee: Robert Bosch GmbH
    Inventors: Uwe Gordon, Guenter Lewentz, Detlev Potz