Patents Assigned to Alfred Teves GmbH
  • Patent number: 5359854
    Abstract: An actuating unit for a hydraulic brake system for automotive vehicles which operates by a precisely defined change-over pressure and with lost travel independent of the speed of actuation. The actuating unit includes a pneumatic brake power booster and a master brake cylinder connected downstream of the pneumatic brake power booster. The master brake cylinder contains a primary piston coupled with an annular piston of larger diameter. The annular piston confines a filling chamber which may be connected to the hydraulic pressure chamber. The annular piston is adapted to uncouple from the primary piston when the pressure acting on the annular piston reaches a predetermined amount. Thus, the displacement of the filling volume by the annular piston does not require an entire stroke of the master brake cylinder.
    Type: Grant
    Filed: August 5, 1993
    Date of Patent: November 1, 1994
    Assignee: Alfred Teves GmbH
    Inventors: Wilfried Wagner, Lothar Schiel
  • Patent number: 5360322
    Abstract: The invention is a hydraulic pump driven by an electric motor which is distinguished by a compact and easily assembled structure. The control apparatus, the electric motor, the hydraulic pump section, the tank, the filter, and the resonator are accommodated within one housing. The hydraulic pump of the present invention includes a modular type of structure, special types of motors, such as a motor without commutator or a "dipped" motor, and is well suited for use in compact spaces in hydraulic systems of automotive vehicles.
    Type: Grant
    Filed: February 22, 1993
    Date of Patent: November 1, 1994
    Assignee: Alfred Teves GmbH
    Inventors: Nabil Henein, Wilhelm Beer, David Vile
  • Patent number: 5356210
    Abstract: An anti-lock hydraulic brake system provides a phase of pressure increase, a phase of pressure decrease as well as a phase in which the pressure is kept constant. To this end, an outlet valve and a selector valve are provided. The selector valve is not connected to the pressure side of the pump as is usual but to the suction side of the pump. This arrangement produces the advantage that the selector valve is disposed in the low-pressure area of the brake system thereby eliminating the occurrence of great pressure surges which result in the emission of noise.
    Type: Grant
    Filed: January 21, 1994
    Date of Patent: October 18, 1994
    Assignee: Alfred Teves GmbH
    Inventor: Joachim Maas
  • Patent number: 5354122
    Abstract: A seating for an inertia ball (101) of a deceleration-sensitive brake power control is disclosed, featuring a substantially stepped feature (114) located above a bottom area (105) and which feature engages the inertia ball so as to not allow any horizontal free movement of the inertia ball (101). Advantageously, a positive restraint is provided engaging the inertia ball (101) in a backward direction with respect to the driving direction (v). The chamber (120) beneath the inertia ball (101) collects pressure fluid, so that the inertia ball (101) remains dry.
    Type: Grant
    Filed: May 18, 1992
    Date of Patent: October 11, 1994
    Assignee: Alfred Teves GmbH
    Inventors: Juergen Schonlau, Holger von Hayn
  • Patent number: 5350042
    Abstract: An automatic adjusting apparatus for a disc brake with a brake caliper housing. The disc brake is furnished with a brake piston which is slidingly positioned within a cylinder for the actuation of a brake shoe and which is actuatable by means of a hydraulic actuating device and a mechanical actuating device. The apparatus also includes an extendable adjusting unit which is disposed between the brake piston and the mechanical actuating device and includes an adjusting nut threadedly mounted on an adjusting spindle. The apparatus is arranged with a friction clutch to hold back one of the adjusting elements in the event of a mechanical actuation. The brake piston has a cylindrical portion which is directed into the interior of the brake piston and projects from the brake piston. The cylindrical portion of the brake piston is surrounded by the adjusting nut and a ring-shaped circumferential sealing element bears against an external surface of the cylindrical portion of the brake piston.
    Type: Grant
    Filed: February 26, 1993
    Date of Patent: September 27, 1994
    Assignee: Alfred Teves GmbH
    Inventor: Rudolf Thiel
  • Patent number: 5350226
    Abstract: An anti-lock hydraulic brake system is described wherein a throttle valve has a restrictive flow condition which becomes effective in the brake line in the event of brake slip control. Pumps for reapply pressure deliver fluid to the wheel brake via this restriction and regulating the pressure in the wheel brake is performed by control of an outlet valve. The throttle valve is operated hydraulically by various arrangements including the application of pump pressure, or by wheel brake pressure applied upon opening of the outlet valve at the start of an anti-lock control cycle.
    Type: Grant
    Filed: December 10, 1991
    Date of Patent: September 27, 1994
    Assignee: Alfred Teves GmbH
    Inventors: Jochen Burgdorf, Hans-Dieter Reinartz, Helmut Steffes, Norbert Ocvirk, Peter Volz, Lutz Weise, Helmut Fennel, Hans Wupper, Hans-Wilhelm Bleckmann, Erhard Beck, Dieter Dinkel, Karlheinz Haupt
  • Patent number: 5343985
    Abstract: The invention is related to a spot-type disc brake with a stationary brake carrier (19) at which a floating caliper (1) is slidingly guided which straddles the edge of a brake disc (10), with two brake cylinders (11, 12) which are positioned on the internal axial side of the brake disc (10) aside each other and whose brake pistons (13, 14) act on the brake shoes (5, 7) which are arranged on the same axial side and in circumferential direction of the brake disc (10) at a distance from each other.According to the invention a third brake shoe (6) is fixed on the external axial side of the brake disc (10) to the floating caliper (1), which brake shoe is positioned staggered in such a manner that its friction area point of gravity (36) comes to be arranged substantially between the other two brake shoes (5, 7) in the circumferential direction of the brake disc (10). Braking noises and brake rubbing are eliminated by this arrangement.
    Type: Grant
    Filed: August 7, 1992
    Date of Patent: September 6, 1994
    Assignee: Alfred Teves GmbH
    Inventors: Rudolf Thiel, Andreas Doell, Georg Halasy-Wimmer
  • Patent number: 5340285
    Abstract: The present invention relates to a drive assembly, in particular a motor pump assembly for slip-controlled brake systems, with a device for transforming rotatory into translatory movements, including a drive shaft which is movably guided in a housing, and an eccentric device which is associated with the drive shaft. In order to be able to change the dimension of the eccentric, it is provided that the eccentric device is formed of two eccentrics which are turnable relative to each other and are in mesh with each other in a form-fit manner, so that at least an eccentric sum dimension formed from the individual eccentric dimensions of two eccentrics, respectively, can be set variably.
    Type: Grant
    Filed: March 8, 1993
    Date of Patent: August 23, 1994
    Assignee: Alfred Teves GmbH
    Inventors: Hans-Dieter Reinartz, Helmut Steffes
  • Patent number: 5335981
    Abstract: The present invention relates to a brake system with anti-lock control and traction slip control having a master cylinder to which braking pressure can be applied by a brake pedal, which is furnished with pressure fluid by a pressure fluid reservoir, and which is connected to at least one brake cylinder of a driven wheel via at least one brake line; a low-pressure accumulator and a return-delivery pump for the anti-lock operation, as well as a supply pressure generating source with a limited fuel delivery for traction slip control which is arranged in the pressure fluid reservoir. The supply pressure generating source can be used for the rapid preliminary fill-up of the brake cylinder when the pump starts to operate, as well as for generating a supply pressure on the suction side of the pump.
    Type: Grant
    Filed: August 24, 1992
    Date of Patent: August 9, 1994
    Assignee: Alfred Teves GmbH
    Inventors: Peter Volz, Dalibor Zaviska
  • Patent number: 5333946
    Abstract: The valve sleeve (3) of an electromagnetic valve is secured to a housing by a friction grip, and also a formed interlock using a bushing (1) inserted in a housing bore of a valve housing (2). To enhance the holding force effective on contact faces between valve housing (2), valve sleeve (3) and bushing (1), the friction grip is supplemented by a formed interlock therebetween, with interfit corrugations or a conical-cylindrical combined shape, effective between the contacting faces, to better resist thrust forces exerted by pressure within the sleeve.
    Type: Grant
    Filed: May 27, 1992
    Date of Patent: August 2, 1994
    Assignee: Alfred Teves GmbH
    Inventors: Andre F. L. Goossens, Karlheinz Seitz, Josef Lauer
  • Patent number: 5333945
    Abstract: A brake pressure control system for automotive vehicles with an anti-locking control system is disclosed, in which an outlet valve (10) associated with a wheel cylinder has a closing element (5) which is coupled to the closing element (6) of the inlet valve (11) through a coupling housing (14) so that the closing element (5) of said outlet valve opens the closing element (6) of the inlet valve (11) and in its open position it allows closing of the closing element of the inlet valve. A plurality of valve chambers and the action of a self regulating a control bushing (48) which also acts as the coupling, a flow limiting valving action to the wheel cylinder (2) is attained. In another embodiment, inlet and outlet solenoid valves are operated by a single common electrical line, the inlet valve held closed despite deenergization by inlet fluid pressure from the master cylinder or pump as long as the pressure therefrom is greater than the pressure in the wheel cylinder.
    Type: Grant
    Filed: November 25, 1992
    Date of Patent: August 2, 1994
    Assignee: Alfred Teves GmbH
    Inventors: Peter Volz, Bernd Schopper
  • Patent number: 5332303
    Abstract: An anti-lock-controlled hydraulic brake system is described having a pump (9) and a master brake cylinder (1). An arrangement for controlling the pump pressure is integrated in the master brake cylinder ( 1 ) and consists of the combination of a connection of the pump to the master cylinder and reservoir, and a primary seal (30, 34) cooperating with a compensating hole (36) in the master cylinder wall. The seal (30, 34) consists of an elastic ring (37) lying on the inside and of a slide ring (38) lying on the outside. The necessary communication between the storage reservoir ( 7 ) and the brake circuits, which enables the brake circuits to be resupplied via a non-return valve, is effected via the nonreturn valves (10, 11) of the pump (9). The double seal can be backed by a secondary seal (41) which completely seals the working chamber against leakage flow past the primary ring seal.
    Type: Grant
    Filed: June 16, 1992
    Date of Patent: July 26, 1994
    Assignee: Alfred Teves GmbH
    Inventor: Hans Wupper
  • Patent number: 5332304
    Abstract: The present invention relates to a hydraulic brake system with anti-lock control, including a main pressure line leading from a master cylinder to at least one wheel brake and into which a normally open inlet valve is inserted. A pressure fluid return delivery line is connected to an outlet valve and accommodates a pressure fluid accumulator. Connected downstream of the pressure fluid accumulator, an auxiliary pressure pump takes pressure fluid from the pressure fluid accumulator and delivers the fluid via an auxiliary pressure line to the wheel brake. The auxiliary pressure line is connected to the pressure side of the auxiliary pressure pump and establishes a permanent direct hydraulic connection to the wheel brake so that the auxiliary pressure pump is adapted to be isolated from the master cylinder by the inlet valve. A low-noise brake system is accomplished thereby which permits a reactionless positioning of the brake pedal without complicated controls.
    Type: Grant
    Filed: February 1, 1993
    Date of Patent: July 26, 1994
    Assignee: Alfred Teves GmbH
    Inventor: Joachim Maas
  • Patent number: 5332302
    Abstract: A brake pressure control device (1) is described in which a low-pressure valve (19) and a high-pressure valve (29) are both actuatable by a brake pedal, resulting in a brake circuit (36) being connectible alternatively either to a reservoir (23) or to a pressure source (33, 34) by releasing or depressing the brake pedal. In order to allow control of the brake pressure by an electronic control, a valve piston (17) operating the high and low pressure valves (19, 29) is movable by an electromagnet (15) independently of the actuating position of the brake pedal, into a position in which the brake circuit (36) is connected to the reservoir (23) and the connection to the pressure source (33, 34) is closed.
    Type: Grant
    Filed: July 8, 1992
    Date of Patent: July 26, 1994
    Assignee: Alfred Teves GmbH
    Inventor: Joachim Maas
  • Patent number: 5330021
    Abstract: The invention is related to an electromechanical power steering system (1) for vehicles whose servomotor (5) is positioned in the passenger compartment (2) in order to protect it from negative effects, such as mud, oil, fuel or similar which customarily exist in the engine compartment.
    Type: Grant
    Filed: September 22, 1992
    Date of Patent: July 19, 1994
    Assignee: Alfred Teves GmbH
    Inventors: Wilhelm Beer, Juergen Balz
  • Patent number: 5330268
    Abstract: An apparatus for determining the boiling temperature of a brake fluid to in turn determine the water content therein includes an electrically heatable sensor element (13) immersed into the fluid under test, a power source (12) supplying a current of a constant amplitude, and a measuring system (15) for measuring the voltage drop on the sensor element (13). A stable cellular convection heat transfer mechanism into the surrounding fluid arises, with the voltage drop across the sensor element (13) being indicative of the boiling point of the fluid. The sensor element is in the form of a linear conductor (13', 20, 21) clamped on either end. The sensor element also may comprise a plurality of linear conductors (13', 20, 21) of this type connected in parallel or in series.
    Type: Grant
    Filed: September 14, 1992
    Date of Patent: July 19, 1994
    Assignee: Alfred Teves GmbH
    Inventors: Hans-Christof Klein, Peter Lohberg, Hans-Joachim Krause, Arno May, Dietmar Oberdorfer, Ulrich Pluquett
  • Patent number: 5330035
    Abstract: Various forms of a disc brake hold down spring are disclosed, the spring having two legs disposed in a V-shape and being elastically swingable in respect of each other. In a first form, the legs extend axially and are each formed with a wing loop with one side of the wing being lockable in an undercut opening in the housing while the opposite wing side engages the backplate of at least one brake show. In a second form, the legs extend circumferentially have ends engaging the brake shoes, with a central section received in a brake housing guide opening.
    Type: Grant
    Filed: July 24, 1991
    Date of Patent: July 19, 1994
    Assignee: Alfred Teves GmbH
    Inventors: Ulrich Klimt, Georg Halasy-Wimmer, Helmut Ruckert, Matthias Jakob
  • Patent number: 5327056
    Abstract: A circuit configuration for limiting the cutoff voltage occurring in controlling a servomotor (M) by means of width-modulated DC pulses comprises a power transistor (T2) which, via a capacitor (C) is connected through for a short time when a cutoff voltage appears thus limiting the cutoff voltage. Subsequently the transistor (T2) presents a high impedance. As a result a short-circuiting of the servomotor (M) will be prevented in the phase in which a spring force resets the servomotor into its zero position.
    Type: Grant
    Filed: May 5, 1993
    Date of Patent: July 5, 1994
    Assignee: Alfred Teves, GmbH
    Inventors: Heinz Loreck, Mario Engelmann
  • Patent number: 5325940
    Abstract: A disc brake having a brake caliper provided with a hydraulic actuating device including a brake cylinder and a brake piston. The brake piston is sealed relative to the brake cylinder by way of a sealing ring arranged in a surrounding annular groove of the brake cylinder. The annular groove is provided with a recess arranged in the transitional area between a groove wall and the cylinder surface. The recess is confined by at least three surrounding conical surfaces whose angles towards the cylinder surface increase progressively, starting from the surface which borders on the cylinder surface up to the surface which borders on the groove wall.
    Type: Grant
    Filed: February 1, 1993
    Date of Patent: July 5, 1994
    Assignee: Alfred Teves GmbH
    Inventors: Helmut Rueckert, Kurt Ruehle
  • Patent number: 5323685
    Abstract: An actuating unit for a hydraulic brake system for automotive vehicles for shortening the actuating travel of the brake power booster to pre-charge the brake system. The actuating unit includes a master cylinder and a pneumatic brake power booster connected upstream thereof. A first sealing seat (10) of a control valve (9) of the brake power booster (1), which control valve is arranged in a control housing (8), is designed separately of the control housing (8) to be slidable within limits in relation thereto. The first sealing seat (10) is held on a stop (18) on the booster housing during a predefinable actuating stroke of the control housing (8) and, respectively, of a movable wall (5) generating the boosting force. After the required actuating travel of the brake power booster, the first sealing seat (10) is carried away from the stop (18) which causes a connection between the working chamber (7) and the vacuum chamber (6).
    Type: Grant
    Filed: September 3, 1992
    Date of Patent: June 28, 1994
    Assignee: Alfred Teves GmbH
    Inventor: Wilfried Wagner