Patents Assigned to Alfred Teves GmbH
  • Patent number: 5295739
    Abstract: A brake pressure control apparatus for automotive vehicles with an anti-locking control system (ABS) and/or with a traction slip control system (TSS) is presented. In the inlet line to the wheel cylinder an inlet valve is provided which affords a change-over from an orifice function into a flow limiting valve function at a predetermined wheel cylinder pressure. Flow is initially through an orifice (6) in a control slide valve piston (20), held in its initial position by a prestressing spring (23) acting through an auxiliary piston in engagement with control slide valve piston (20). An increase in pressure in the wheel cylinder (13), also exerted in the wheel cylinder pressure chamber (9), to a predetermined level, causes the auxiliary piston (27) to disengage from the control slide valve piston (20), preventing the force of the prestressing spring (23) from acting on the control slide valve piston (20).
    Type: Grant
    Filed: October 22, 1992
    Date of Patent: March 22, 1994
    Assignee: Alfred Teves GmbH
    Inventors: Jochen Burgdorf, Helmut Steffes, Peter Volz, Erhard Beck, Dalibor Zaviska
  • Patent number: 5295293
    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: July 9, 1993
    Date of Patent: March 22, 1994
    Assignee: Alfred Teves GmbH
    Inventor: Bernd Pfeiffer
  • Patent number: 5293808
    Abstract: A vacuum brake power booster and a process is disclosed in which a precise adjustment of the power boost startup characteristic is achieved. The adjustment is carried out as a final step in the manufacture of the booster adjusting the distance between the valve piston and an elastic reaction distance. During adjustment, the vacuum brake power booster has a vacuum applied. A pre-established input force is exerted on the piston rod while simultaneously measuring the output force exerted by the push rod, and the axial length of the valve piston is modified until the measured output force is within a pre-established range. The adjustment is carried out by modifying the length of a two piece valve piston or by temporarily extending a rod within the valve piston until a correct output force is reached and thereafter removing the rod and inserting a transmission pin of a length determined by the extent of travel of the rod at the point at which the desired output force was attained.
    Type: Grant
    Filed: June 12, 1992
    Date of Patent: March 15, 1994
    Assignee: Alfred Teves GmbH
    Inventors: Manfred Rueffer, Ralf Jakobi, Jurgen Bauer, Peter Kraft
  • Patent number: 5293315
    Abstract: A variable control threshold (RS) is formed by a circuit configuration for the traction slip control through brake management, with the control threshold being composed of a basic threshold (GS) and a portion derived from the wheel slip acceleration. The wheel slip (VR) is compared to the control threshold to determine a control deviation, i.e. the difference between the control threshold (RS) and the wheel slip (VR). The brake pressure pattern (p), during a traction slip control process is controlled in response to the wheel slip acceleration.
    Type: Grant
    Filed: June 3, 1991
    Date of Patent: March 8, 1994
    Assignee: Alfred Teves GmbH
    Inventors: Alexander Kolbe, Klaus Honus
  • Patent number: 5290096
    Abstract: A pressure control valve is disclosed comprising a valve tappet (1) guided in a valve housing (3) and accommodating a compression spring (4), with a valve closure member (10) on one end of the valve tappet (1) and mating with a valve seat (9) establishing a connection between a pressure supply port (11) that emanates from a pressure fluid source and a pressure return channels (12) once the pressure attains a specific preset desired valve. In order to diminish noise, at least one friction element (2) is engagement with the valve tappet (1) movable to abut on radial friction surfaces of the valve housing (3) and/or the valve tappet (1).
    Type: Grant
    Filed: May 8, 1992
    Date of Patent: March 1, 1994
    Assignee: Alfred Teves GmbH
    Inventors: Erhard Beck, Anton David, Helmut Weisbrod, Horst Kornemann
  • Patent number: 5290098
    Abstract: A hydraulic anti-locking brake unit is presented in which the brake line is shut off by an isolating valve 20 during a control action. For the reduction of the pressure, the outlet valve 7 is opened, so that the pump 14 delivers hydraulic fluid out of the wheel brake into the high-pressure accumulator 19. For a renewed pressure build-up, the inlet valve 6 is opened, so that hydraulic fluid flow is directed out of the high pressure accumulator 19 to the wheel brake. In order to be able to utilize a high pressure accumulator having a low receiving capacity, various valving arrangements are disclosed to direct excess flow from the pump either to the master cylinder or a low pressure accumulator.
    Type: Grant
    Filed: February 1, 1993
    Date of Patent: March 1, 1994
    Assignee: Alfred Teves GmbH
    Inventors: Jochen Burgdorf, Hans-Dieter Reinartz, Helmut Steffes, Joachim Maas, Dieter Dinkel
  • Patent number: 5288142
    Abstract: A hydraulic brake system is described including a brake slip and/or traction slip control, wherein a pump required herefor is connected in series into the brake conduit through which, in a normal deceleration process, pressure fluid is displaced from the master brake cylinder to the wheel brake. The pump is mounted so that the intake side thereof is in communication with the master brake cylinder and the pressure side thereof is in communication with the wheel brake. Upon commencement of a slip control, the pump drive is turned on. As the master cylinder pressure prevails on the intake side of the pump the pump can very quickly reach the full discharge capacity, thereby enhancing control response of the slip. Moreover, the risk of air being sucked into the brake system is reduced.
    Type: Grant
    Filed: June 30, 1993
    Date of Patent: February 22, 1994
    Assignee: Alfred Teves GmbH
    Inventor: Jochen Burgdorf
  • Patent number: 5287764
    Abstract: Apparatus for actuating a hydraulic power steering system for automotive vehicles, wherein the steering shaft (1 ) is allowed to roll off on the gear rack (3) to a small degree to actuate the steering valve. To enable this rolling motion, the steering shaft (1 ) is supported in a sleeve (9) which, in turn, is supported through needle bearings (10) so as to be rotatable in relation to the steering gear housing (4). To prevent inadvertent steering maneuvers in the event of partial or complete system failure, the needle bearing axis is arranged in parallel to the center line of the steering shaft (1) as well as in one plane with the steering shaft and with the point of force transmission between pinion (2) and gear rack (3). The needle bearing axis is radially outward from the central point of the steering shaft axis than the point of force transmission. A captivated spring (24) is provided to retain the valve slide (19) in its neutral position.
    Type: Grant
    Filed: September 14, 1992
    Date of Patent: February 22, 1994
    Assignee: Alfred Teves GmbH
    Inventor: Wilhelm Beer
  • Patent number: 5284228
    Abstract: A floating-caliper spot-type disc brake is disclosed having an arrangement for actively retracting the indirectly actuated external brake shoe to create a clearance with the brake disc. Elastic spring elements (24, 34, 38, 45) engage the external brake shoe (10) and the carrier arms (2, 3) of the brake carrier (1) and which are elastically tensioned by actuation of the brake to allow a slight retraction of the external brake shoe when the elements relax as the brake is released. The spring elements are mounted to allow a frictional grip to be overcome to shift the relative relaxed position of the spring element and external brake shoe as the brake lining wears, so that a constant disc clearance is maintained.
    Type: Grant
    Filed: April 2, 1992
    Date of Patent: February 8, 1994
    Assignee: Alfred Teves GmbH
    Inventors: Rolf Weiler, Uwe Hendrich
  • Patent number: 5282677
    Abstract: A hydraulic anti-lock brake system is disclosed in which the pressure in the wheel brakes can be regulated by means of an inlet valve and an outlet valve in response to the wheel rotational pattern. The wheel brake is supplied with pressure fluid out of the pumps through the inlet valve, and pressurized fluid is taken therefrom through the outlet valve. A differential pressure limiter (18) in front of the inlet valve (15) limits the difference in pressure allowed to build up across the inlet valve by closing a valve until a sufficient pressure build up occurs on the wheel brake. This considerably decreases the noise developed during valve operation. A pressure relief valve (30) insures that an evenly high pressure build-up takes place when the inlet valve (15) is closed by opening when a predetermined pressure difference develops across the inlet valve to allow a higher wheel brake pressure to equalize with the pressure upstream from the inlet valve.
    Type: Grant
    Filed: March 6, 1992
    Date of Patent: February 1, 1994
    Assignee: Alfred Teves GmbH
    Inventor: Harald Luetteke
  • Patent number: 5277481
    Abstract: In a hydraulic brake system for automotive vehicles with an electronically controlled brake force distribution and with anti-lock control, the rear-wheel brakes are connected via inlet valves (5, 7) closed in their inactive position. Placed in parallel to these valves is an arrangement (13, 14; 13', 14') which is substantially composed of the series connection of a brake force regulator (17, 18, 17', 18') with a throttle (15, 16) or a multiple-way valve (21, 22) which is open in its inactive position.
    Type: Grant
    Filed: October 26, 1992
    Date of Patent: January 11, 1994
    Assignee: Alfred Teves GmbH
    Inventors: Lutz Weise, Helmut Fennel, Hans Wupper
  • Patent number: 5272636
    Abstract: A circuit configuration for a brake system with anti-lock control and/or traction slip control including circuits (4) for improving the control during cornering. In the presence of a wheel rotational behavior typical of cornering when during a control action the wheel slip, that means the deviation of the wheel speed from the vehicle reference speed, exceeds the slip threshold (SO), this wheel rotational behavior lasting despite reduction of the braking pressure and the deceleration-responsive/acceleration-responsive control thresholds not being attained, the wheel slip is augmented by an offset (.DELTA.SO) for an invariably preset period of time or a period of time which is dependent on the further wheel rotational behavior, on the braking pressure variation and/or other control criteria.
    Type: Grant
    Filed: October 1, 1991
    Date of Patent: December 21, 1993
    Assignee: Alfred Teves GmbH
    Inventors: Gunther Buschmann, Norbert Ehmer, Hans-Joachim Buettner, Van U. Nguyen
  • Patent number: 5261312
    Abstract: A vacuum brake power booster (1) has an electric travel sensor (3) for monitoring the position of a movable wall (4) furnishing the boosting power of the brake power booster. The travel sensor (3) is mounted by a sensor receptacle (2) which is made of plastic material and which is sealed off with respect to the booster housing (10) by means of a seal. In order to assure effective sealing by creating a constant degree of compression of the seal (7) despite different material thicknesses of the booster housing (10), angled tabs (12) are formed against which locking projections (11) are abutted.
    Type: Grant
    Filed: May 26, 1992
    Date of Patent: November 16, 1993
    Assignee: Alfred Teves GmbH
    Inventors: Horst Bornemann, Albin Loew
  • Patent number: 5257679
    Abstract: A spot-type disc brake in which a two part brake housing forms a central radial cavity open at the outside which allows the brake shoes to be removed through the cavity without disassembly of the housing. The brake shoes are engaged by surfaces on short height projection pairs protruding into the cavity from either side, the surfaces machined with a radiused shape concentric with the actuator cylinder bores to facilitate manufacture. The short height allows the radiused shape without preventing removal of the brake shoes. In a first embodiment, the projections are also formed with outer tangential surfaces, with surfaces on the brake shoes urged thereagainst with a retained spring. In a second embodiment, a holding pin extends across the central cavity and through bores at the outside of each brake shoe, a retainer spring engaged with the holding pin and brake shoes.
    Type: Grant
    Filed: July 8, 1992
    Date of Patent: November 2, 1993
    Assignee: Alfred Teves GmbH
    Inventors: Rolf Weiler, Uwe Bach, C. Peter Panek
  • Patent number: 5257572
    Abstract: A vacuum brake power booster is described wherein the return movement of a valve piston actuating a control valve is limited by a U-shaped element (17) slidable into a control housing (11). In order to improve the ventilation of the working chamber of the brake power booster initiated on actuation and to shorten the booster's response time, exit areas (42, 43, 44, 45) of ventilation ducts (38, 39, 40, 41) permitting an air flow into the working chamber (3) are formed radially outwardly of an area in the control housing (11) between the arms of the U-shaped element (17), the exit areas being confined by the outside walls (34, 35, 36, 37, 46, 47, 48, 49) of air evacuation ducts (28, 29, 30, 31) interconnecting the working chamber (3) and a vacuum chamber(4).
    Type: Grant
    Filed: July 22, 1992
    Date of Patent: November 2, 1993
    Assignee: Alfred Teves GmbH
    Inventors: Ralf Jakobi, Michael Graichen
  • Patent number: 5253577
    Abstract: A clutch master assembly made of plastic material for an automotive vehicle. The assembly a plastic cylinder housing (1) and a piston (2) and a plastic bushing (3). The plastic bushing is arranged to allow it to be screwed in by means of a thread portion (4) which is located in the housing. By the screwing-in of the bushing a grooved disc (5) and a grooved cup (6) are secured in the assembly. The grooved cup is furnished with knobs (21, 22, 23) which exert a force in axial direction on the arrangement consisting of the grooved cup (6) and the grooved disc (5). The piston-side enlarged end of the piston rod (31, 104) is secured within the piston (2, 103) by a back injection.
    Type: Grant
    Filed: March 30, 1992
    Date of Patent: October 19, 1993
    Assignee: Alfred Teves GmbH
    Inventors: Juergen Schonlau, Alfred Birkenbach, Ralf Harth, Wolfgang Ritter
  • Patent number: 5251971
    Abstract: An anti-lock-controlled brake system for automotive vehicles is described, with a braking pressure generator (6), connected via a main pressure line (5) to a wheel brake (1) with an auxiliary hydraulic pressure pump (2) connected to an auxiliary pressure line (12), and a pressure medium accumulator (19) connected to a pressure limiting valve (3) control-lable in dependence on the hydraulic pressure of the wheel brake (1). A control of the accumulator pressure and volume within a closed hydraulic system is thereby provided which will take place in dependence on the wheel brake pressure to be in conformity with actual requirements.
    Type: Grant
    Filed: April 23, 1992
    Date of Patent: October 12, 1993
    Assignee: Alfred Teves GmbH
    Inventors: Hans-Dieter Reinartz, Helmut Steffes
  • Patent number: 5251727
    Abstract: A floating-caliper disc brake is described of a type having brake shoes (3, 4) which are positioned on either side of a brake disc (2) and with a brake caliper (1) which straddles the brake shoes (3, 4) and the edge of said brake disc (2), which brake caliper is axially slidingly supported on a brake carrier (5). A brake piston is mounted in the brake caliper (10) adjacent one brake shoe (4). A spring element (12) is disposed extending between the brake piston and a facing surface of the brake caliper adjacent the other brake shoe and acts to retract each brake shoe to create a clearance with the brake disc. The spring element is elastically and plastically deformable by an actuating stroke of the brake piston (10), the elastic deformability being limited to an actuating stroke which corresponds to the brake clearance of both brake shoes (3, 4), the plastic deformation compensating brake lining wear.
    Type: Grant
    Filed: May 14, 1992
    Date of Patent: October 12, 1993
    Assignee: Alfred Teves GmbH
    Inventors: Josef Loeffler, Hilmar Teitge
  • Patent number: 5251969
    Abstract: A brake pressure proportioning controller is described for the rear wheel brakes of an automotive vehicle with a brake unit equipped with an anti-locking control, the brake pressure controller being provided with a lockout arrangement in which an electromagnetic drive prevents the brake pressure controller from performing its pressure reducing function as long as the anti-locking control is functioning. The lockout arrangement includes an actuating element (6) which is axially slidable by the drive (1), an intermediate bushing (8) is formed with radial round holes (34, 34') in which interlocking ball elements (31, 31') are guided in radial directions which are thicker than the wall of the intermediate bushing (8) and which are normally retained by the actuating element (6) in a position in which they lock any axial movement of the control element (9) in the direction of the electromagnetic drive (1).
    Type: Grant
    Filed: May 28, 1992
    Date of Patent: October 12, 1993
    Assignee: Alfred Teves GmbH
    Inventors: Rudolf Cezanne, Rudolph Heuer
  • Patent number: 5249935
    Abstract: A piston pump is described which adapts the output flow to the supply flow which is intended in particular for use in a hydraulic brake slip control apparatus, the pump having a pump housing (2) with working chambers (9, 10) which are connectible to supply lines via an inlet valve (5) and an outlet valve (6). Working pistons (15) defining in part the working chambers are cyclically movable to increase and decrease the volume of the working chambers (9, 10) and are guided in cylinder bores (11, 12) and driven by a an eccentric (14) in order to perform stroke movements. The cylinder bores (11, 12) also receive charging pistons (18) which also define in part the working chambers (9, 10) and which are movable to decrease the volume of the working chambers (9, 10) by way of compression springs (20) supported on the pump housing (2) and which, via a pin (21), can be pressed against the working pistons (15).
    Type: Grant
    Filed: May 4, 1992
    Date of Patent: October 5, 1993
    Assignee: Alfred Teves GmbH
    Inventor: Jochen Burgdorf