Patents Assigned to Alfred Teves GmbH
  • Patent number: 5614798
    Abstract: A circuit configuration for the control of a servomotor (M) with the aid of current pulses supplied by a current-controlled final stage (1) of a control system. The pattern of current rise is analyzed after actuation of the final stage (1) for identifying a short circuit in the servomotor (M) across the power supply system (+U.sub.B). An excessively high current (I.sub.K), after a measuring period (T.sub.M), commencing after the transistor (LT) of the final stage (1) has been placed in saturated state, is indicative of a short circuit.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: March 25, 1997
    Assignee: Alfred Teves GmbH
    Inventors: Michael Zydek, Mario Engelmann, Lothar Spornitz
  • Patent number: 5564798
    Abstract: An anti-locking brake system is provided, wherein, during a control operation, the brake conduit is blocked by a separating valve. The wheel brakes, through a return conduit, are in communication with the intake side of a pump. Provided in the return conduit is an outlet valve. The pressure side of the pump, through a pressure conduit, is in communication with the brake conduit between the separating valve and the wheel brake. A restriction element is provided in the pressure conduit. Check valves between the master brake cylinder and the pressure side of the pump enable pressure fluid, if an enhanced amount of pressure fluid is required by the control circuit, to be fed from the master brake cylinder into the control circuit.
    Type: Grant
    Filed: November 30, 1992
    Date of Patent: October 15, 1996
    Assignee: Alfred Teves GmbH
    Inventors: Dalibor Zaviska, Paul Linhoff
  • Patent number: 5550739
    Abstract: A semi-active suspension control system comprises exclusively chassis acceleration sensors (S.sub.1 to S.sub.3) as sensors (1) for obtaining the information for the damping force control. The output signals of these sensors are analyzed in a filter (3), the transmission behavior of which is in linear approximation to the transmission behavior of a discrete Kalman filter, when concentrating on the frequency range between the natural chassis frequency and the natural wheel frequency.
    Type: Grant
    Filed: March 9, 1995
    Date of Patent: August 27, 1996
    Assignee: Alfred Teves GmbH
    Inventors: Michael Hoffmann, Alfred Eckert
  • Patent number: 5542772
    Abstract: The invention is related to an articulated joint fitting preferably for automotive vehicles with a wobble gearing to create a swivelling motion of the joint parts. As a development of the articulated joint fitting, a reduction of costs is achieved in that the spur gear wheel is composed of a plurality of elements and a simplified adjustment of the eccentric with respect to one of the articulated joint fittings is attained.
    Type: Grant
    Filed: July 20, 1994
    Date of Patent: August 6, 1996
    Assignee: Alfred Teves GmbH & Co oHG
    Inventors: Gerhard Reuber, Hans G. Menne, Gavriel Shafry
  • Patent number: 5520447
    Abstract: An electrohydraulic pressure control device consisting of one or several electromagnetically operable hydraulic valves arranged in a block-shaped manner on a valve accommodating body. In order to provide both a compact and operationally optimized pressure control device which makes manufacture, checking and assembly as easy as possible and where different thermal expansions of the components are to be received possibly without any tensions, this invention provides that the coils (1), flexibly held frictionally and/or positively by an elastic or plastic holding device (4) arranged on the carrier element (2) of the cover (3), are flexibly alignable with respect to the valve accommodating body (5).
    Type: Grant
    Filed: December 19, 1994
    Date of Patent: May 28, 1996
    Assignee: Alfred Teves GmbH
    Inventors: Jochen Burgdorf, Peter Volz, Heinz Loreck
  • Patent number: 5494140
    Abstract: A brake shoe for spot-type disc brakes. The novel brake shoe incorporates a retaining spring which is fixed to the brake shoe's backplate and which is intended to engage a hollow portion of a brake piston. Preferably the backplate is coated with a silencing varnish paint for noise abatement. A fixing section of the retaining spring is formed with a step which is in abutment against the backplate in a range devoid of silencing varnish paint. The retaining spring is secured to safeguard against twisting. The operability of the retaining spring is preserved, independently of the accidental thickness of the layer of silencing varnish paint.
    Type: Grant
    Filed: January 26, 1995
    Date of Patent: February 27, 1996
    Assignee: Alfred Teves GmbH
    Inventors: Rolf Weiler, Dieter Bieraugel, Uwe Bach
  • Patent number: 5473958
    Abstract: A spindle drive for a vehicle seat connected with an upper rail. According to this invention, an upper rail slides on the surface of a drive nut preferably made of plastic whose internal thread is engaged by the spindle. Advantageous further developments deal with improving the longitudinal guidance of the upper rail on the drive nut as well as with preventing the upper rail from radially moving away from the drive nut.
    Type: Grant
    Filed: December 10, 1993
    Date of Patent: December 12, 1995
    Assignee: Alfred Teves, GmbH & Co., OHG
    Inventors: Horst Jeck, Hans G. Menne
  • Patent number: 5474106
    Abstract: A solenoid valve for hydraulic brake units with slip control is described which has a magnetic armature (2) surrounded by a valve dome (14), the magnetic armature (2) positioned by energization of a magnet coil (16), so that a valve needle (1) which is carried by the magnetic armature (2) is moved onto a valve seat (3). A hydraulic actuating force is generated by an arrangement causing the valve needle (1) to open even through the solenoid valve is energized causing the valve to act as a pressure relief or limiter valve.
    Type: Grant
    Filed: December 1, 1993
    Date of Patent: December 12, 1995
    Assignee: Alfred Teves GmbH
    Inventors: Jochen Burgdorf, Peter Volz, Andre F. L. Goossens
  • Patent number: 5472070
    Abstract: A controllable hydraulic vibration absorber is disclosed whose power cylinder and a tube defines a connecting duct which affords a balance of volume between both power chambers of the vibration absorber and a balancing chamber which is formed between the tube and an external tube disposed coaxially with it. The controllable vibration absorber valve affords variations of the vibration absorbing power and allows a flow through it in one direction only and is arranged between the connecting duct and the balancing chamber so as to be integrated as to its action in a valve assembly which is constituted by a non-return valve and by a switching valve. The switching valve is inserted between the second power chamber and the connecting duct.
    Type: Grant
    Filed: December 16, 1994
    Date of Patent: December 5, 1995
    Assignee: Alfred Teves GmbH
    Inventor: Hans-Joerg Feigel
  • Patent number: 5469757
    Abstract: In a windshield wiper drive for a vehicle, the wiper spindle performs a rotational movement to-and-fro. In order that the inversion of motion does not take place all of a sudden but in a cushioned manner, a part-pinion with a pinion gap is realized when one tooth of the part-pinion is engaged by a cushioning stop member of a spring element. Reciprocally, another tooth strikes against an associated stop member shortly after the inversion of motion. The spring element is elastically deflected in the final phase of the rotational movement and thereby cushions the part-pinion. The spring element is preferably fastened to the gearing cover.
    Type: Grant
    Filed: August 27, 1993
    Date of Patent: November 28, 1995
    Assignee: Alfred Teves GmbH
    Inventors: Harro Buhl, Hans-Peter Rienhardt
  • Patent number: 5464079
    Abstract: A two-tube shock absorber for automotive vehicles is furnished with a shock absorber valve positioned at the lower end of its power cylinder and comprising a pilot control stage, a main stage to adjust its "soft" characteristic curve which is desired for reasons of driving comfort, or a special characteristic curve out of a field of potential characteristic curves. According to the invention, in a lower range of piston speed the shock absorbing power is determined exclusively by the variable cross-sectional area of flow of the pilot control stage wherein the main stage remains closed. In an upper range of piston speed the shock absorbing power is determined by the variable flow cross-sectional areas both of the main stage and of the pilot control stage.
    Type: Grant
    Filed: September 13, 1993
    Date of Patent: November 7, 1995
    Assignee: Alfred Teves GmbH
    Inventors: Peter Lohberg, Ronald Bayer, Siegfried Halat, Dieter Kircher, Diogenes Perez, Stefan Sparschuh
  • Patent number: 5454632
    Abstract: A hydraulic brake system with anti-lock control and traction slip control has an electric-motor-driven hydraulic pump 6 and a motor 7 for auxiliary pressure supply during a controlled braking operation and during a traction slip control operation by way of brake management. During a traction slip control operation the speed of the hydraulic pump is reduced by way of a reduction in the power consumption of the drive motor of the pump down to a predetermined value where the speed and the noise development are low relative to values with nominal capacity. The power limitation will be cancelled in situations critical to safety and reliability or in case of certain malfunctions of the control system. The power limitation is achieved by way of relays and an ohmic series resistor or by way of a so-called semiconductor relay or electronic relay.
    Type: Grant
    Filed: September 24, 1993
    Date of Patent: October 3, 1995
    Assignee: Alfred Teves GmbH
    Inventors: Jochen Burgdorf, Wieland Kuhn
  • Patent number: 5451867
    Abstract: A circuit configuration which serves to condition the output signal of a rotational speed sensor, e.g., the wheel sensor of an automotive vehicle. The circuit configuration includes a trigger circuit, the "hysteresis" or trigger thresholds thereof being controllable, and includes circuits for determining a coupling factor which, multiplied by the frequency of the sensor signal corresponding to the speed of rotation, forms the amplitude of the sensor output signal. To determine the coupling factor, and to adjust the hysteresis, threshold values are predefined for the output signal of the rotational speed sensor. Upon start of the vehicle, the coupling factor is determined from the frequency of the sensor signal at the point of time the threshold values are reached, and the hysteresis is adjusted accordingly.
    Type: Grant
    Filed: June 24, 1993
    Date of Patent: September 19, 1995
    Assignee: Alfred Teves GmbH
    Inventors: Heinz Loreck, Michael Zydek, Wolfgang Fey
  • Patent number: 5449225
    Abstract: A master brake cylinder for an anti-locking hydraulic brake system is provided, comprising a central valve provided in each piston. The central valve comprises a first valve and a second valve. The opening distance A of the first valve is smaller than the opening distance B of the second valve. The first valve is made of a metallic material while the closure member of the second valve is made of a soft-elastic material, such as a rubber ring 40. Being made of a hard material, the first valve can perform a pressure regulating function, involving, however, the risk that dirt particles contained in the pressure fluid, are forced into the valve ball and the valve seat, respectively, thereby preventing the valve from closing completely. In such an event, at least the closing function of the central valve is performed by the second valve. To a limited extent, the second valve also can take over a pressure control function.
    Type: Grant
    Filed: July 20, 1992
    Date of Patent: September 12, 1995
    Assignee: Alfred Teves GmbH
    Inventors: Jochen Burgdorf, Peter Volz, Werner Volkmar, Rainer Seeger
  • Patent number: 5443097
    Abstract: An arrangement and method for closing off fluid passages is disclosed. The arrangement includes first and second closure members inserted one behind the other in the fluid passage, the second closure member slidably fit into the passage with a clearance and positioning against a sealing shoulder in the fluid passage so that abraded particles caused by press fitting of the first closure member behind the second closure member can not get into the fluid passage.
    Type: Grant
    Filed: December 9, 1993
    Date of Patent: August 22, 1995
    Assignee: Alfred Teves GmbH
    Inventor: Bernd Pfeiffer
  • Patent number: 5443141
    Abstract: A readjusting device wherein the readjusting process is pressure-controlled and is readjusted upon a decreasing brake pressure.The frictional cone is placed in the piston and the sealant is provided between the rotatable readjusting member and the interior wall of the piston. Advantageous embodiments of the readjusting control are disclosed which employ a differential pressure process and improvements in the restoring pattern of the adjusting device.
    Type: Grant
    Filed: August 4, 1993
    Date of Patent: August 22, 1995
    Assignee: Alfred Teves GmbH
    Inventors: Rudolf Thiel, Andreas Doell, Georg Halasy-Wimmer
  • Patent number: 5429425
    Abstract: An independent wheel brake unit for an automotive vehicle is furnished with a hydraulic wheel brake (12), a hydraulic pump (2), an accumulator (6) and electrically actuated valves (9, 10, 11) for controlling the brake pressure. The hydraulic pump generates the actuating pressure required for actuating the wheel brake (12) by receiving the kinetic energy of the vehicle through the vehicle wheel. Because the wheel brake unit supplies itself with energy, fuel is saved and the complexity of the electrical wiring system of the automotive vehicle is reduced. All essential components of the unit together with the steering knuckle (16) of the automotive vehicle can be pre-assembled and mounted on the vehicle, as a unit, preferably in an automatic manner, by a robot, thereby substantially reducing the final-assembly costs.
    Type: Grant
    Filed: July 14, 1993
    Date of Patent: July 4, 1995
    Assignee: Alfred Teves GmbH
    Inventor: Peter Drott
  • Patent number: 5427213
    Abstract: A brake pad for disc brakes is provided in which the brake pad comprises a damping plate attached to the reverse face of a lining carrier plate. The damping plate is attached to the lining carrier plate by way of projections which are molded on the lining carrier plate and extend into corresponding apertures of the damping plate. The external ends of the projections are widened so that the damping plate is pressed against the reverse face of the lining carrier plate.
    Type: Grant
    Filed: November 5, 1993
    Date of Patent: June 27, 1995
    Assignee: Alfred Teves GmbH
    Inventors: Rolf Weiler, Karl Stoerzel, Rudolf Thiel, Ludwig Dreilich, Karl-Friedrich Woersdoerfer, Sang-Cheol Shin, Uwe Bach, Dieter Bieraeugel
  • Patent number: 5417485
    Abstract: A brake system having inlet valves in brake lines between the master brake cylinder and the wheel brakes of the rear axle. The inlet valves are driven via a first current circuit by an electronic analyzing and controlling unit, so that both an ideal brake force distribution is achieved and locking of the wheels is prevented. In order to avoid excessive braking of the rear wheels upon malfunction of the control unit, a second current circuit is provided which comprises a pressure switch responding to the master cylinder pressure. The two current circuits are actuated optionally by way of a relay.
    Type: Grant
    Filed: July 15, 1993
    Date of Patent: May 23, 1995
    Assignee: Alfred Teves GmbH
    Inventors: Jochen Burgdorf, Peter Kauschka
  • Patent number: 5415468
    Abstract: A circuit configuration and method for a traction slip control system which evaluates the speed (v.sub.ER) measured at a driven spare wheel with a correction factor K(t) in order to maintain or improve the control function even when a smaller size spare wheel has been mounted. This correction factor (K(t)) is determined by axlewise comparison of the rotating speeds (v.sub.na1, v.sub.na2 ; v.sub.a, v.sub.ER) of the wheels of one axle and by comparison of the speed differences measured on the driven and nondriven axles, with traction slip control being inactive. Upon transition from a very slippery road surface (.mu..sub.low homogeneous) to a dry road surface (.mu..sub.high homogeneous), without any prior determination of the correction factor, the slip threshold (S) is raised temporarily. When starting with different right/left friction coefficients (.mu.-split), with the spare wheel being mounted on the high friction coefficient side, a higher slip threshold (S.sub.ER) will be effective for this spare wheel.
    Type: Grant
    Filed: September 7, 1993
    Date of Patent: May 16, 1995
    Assignee: Alfred Teves GmbH
    Inventors: Michael Latarnik, Alexander Kolbe, Klaus Honus