Patents by Inventor Lothar Schiel
Lothar Schiel 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).
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Patent number: 5934766Abstract: The present invention relates to a pressure control valve including a valve tappet which is axially movably arranged in the valve housing and, in a first switch position, provides a pressure fluid connection between a first pressure fluid port that opens into the valve housing and a second pressure fluid port that opens into the valve housing, wherein the valve tappet, in a second switch position, separates the pressure fluid connection between the first pressure fluid port and the second pressure fluid port and, in a third switch position, provides a pressure fluid connection between the second pressure fluid port and a third pressure fluid port, to which end a valve closure member which is axially slidable by the valve tappet is lifted from its valve seat.Type: GrantFiled: August 25, 1997Date of Patent: August 10, 1999Assignee: ITT Manufacturing Enterprises Inc.Inventors: Hans-Jorg Feigel, Andreas Klein, Ulrich Neumann, Lothar Schiel
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Patent number: 5836659Abstract: The present invention relates to an electronically controllable brake actuation system for automotive vehicles, including a master brake cylinder operable by way of an actuating pedal, braking pressure generators actuatable by an electronic control unit and directly connected to the wheel brakes of the vehicle, the braking pressure generators being connectable to the master brake cylinder by way of hydraulic connections closable by valve assemblies, at least one sensor device to identify the driver's wish for deceleration, and at least one simulator chamber which interacts with the master brake cylinder.Type: GrantFiled: May 1, 1997Date of Patent: November 17, 1998Assignee: ITT Manufacturing Enterprises Inc.Inventors: Hans-Jorg Feigel, Ulrich Neumann, Andreas Klein, Lothar Schiel
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Patent number: 5826952Abstract: A brake system for automotive vehicles includes a pressure generator to which wheel brake cylinders associated with the individual vehicle wheels are connected by way of hydraulic connections. Actuator units including a cylinder-and-piston assembly and an actuator are inserted into the hydraulic connections. The actuator units permit shutting off the hydraulic connections. To convert the brake system into an active brake system, when the pressure generator and at least one actuator unit are simultaneously actuated, the force resulting from the pressure build-up in the pressure generator and the external actuating force produced by the actuator are applied jointly to the piston of the cylinder-and-piston assembly.Type: GrantFiled: July 1, 1996Date of Patent: October 27, 1998Assignee: ITT Automotive Europe GmbHInventors: Hans-Jorg Feigel, Ulrich Neumann, Lothar Schiel
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Patent number: 5779326Abstract: An actuating unit for a locking-protected motor vehicle brake system having a main brake cylinder and a vacuum brake booster arranged upstream of the main brake cylinder. The movable wall of the brake booster movable against the direction of actuation in the brake pressure control mode separately from the control housing by a pneumatic pressure equalization initiated within the booster housing.Type: GrantFiled: September 14, 1995Date of Patent: July 14, 1998Assignee: ITT Automotive Europe GmbHInventors: Hans-Jorg Feigel, Ulrich Neumann, Lothar Schiel
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Patent number: 5758930Abstract: An electronically controllable anti-lock brake actuation system for automotive vehicles, including a pedal actuated dual-circuit master brake cylinder, and braking pressure generators actuatable by an electronic control unit. Each of the braking pressure generators has a piston slidable in a cylinder bore from an initial position, each piston separating a first working chamber, to which each one wheel brake of the vehicle is connected directly and the master cylinder is connected by way of a closable hydraulic connection, from a second working chamber and is connected to the master cylinder where the stepped piston is operable to achieve a braking pressure generation or boosting.Type: GrantFiled: October 30, 1996Date of Patent: June 2, 1998Assignee: ITT Automotive Europe GmbHInventors: Lothar Schiel, Ulrich Neumann, Hans-Jorg Feigel, Andreas Klen
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Patent number: 5725287Abstract: A hydraulic motor vehicle brake installation, the braking pressure modulation of which occurs over adjustable wing cell pumps, as space-saving solution it is proposed to have all the required wing cell pumps driven over a common shaft by a turning-rate stabilized electric motor. An individual control of each individual wing cell pump occurs through the drive of a lift ring each by one proportional magnet per wing cell pump.Type: GrantFiled: June 18, 1996Date of Patent: March 10, 1998Assignee: ITT Automotive Europe GmbHInventors: Hans-Jorg Feigel, Andreas Klein, Ulrich Neumann, Lothar Schiel
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Patent number: 5713640Abstract: Hydraulic braking system with slip control, comprises a working piston guided within the brake pressure generator, a booster piston of a hydraulic brake force booster for actuating the working piston, at least one wheel brake connected to the brake pressure generator and an electrically operable auxiliary pressure source adapted to be connected to the brake force booster, a control and regulating electronic unit for detecting the wheel rotating pattern and for controlling the wheel brake pressure by means of pressure modulating valves, and an electronic sensor means for detecting the relative movement between the push rod and the booster piston, the output signals of which sensor means are capable of influencing the operation of the auxiliary pressure source, wherein the auxiliary pressure source includes a quick-fill piston which is guided within a servo cylinder arranged on a servo drive.Type: GrantFiled: July 22, 1996Date of Patent: February 3, 1998Assignee: ITT Automotive Europe GmbHInventors: Hans-Jorg Feigel, Ulrich Neumann, Lothar Schiel
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Patent number: 5641211Abstract: A pressure control valve has a valve-closing member displaceable relative to the valve lifter in order to control the flow of pressurized medium between a first and second pressurized medium connection. A third pressurized medium connection is severed from the second pressurized medium connection by another valve-closing member that can be actuated by the valve lifter.Type: GrantFiled: September 14, 1995Date of Patent: June 24, 1997Assignee: ITT Automotive Europe GmbHInventors: Hans-Jorg Feigel, Ulrich Neumann, Lothar Schiel
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Patent number: 5609399Abstract: A hydraulic braking system with slip control, comprising a working piston guided within the brake pressure generator, a booster piston of a hydraulic brake force booster for actuating the working piston at least one wheel brake connected to the brake pressure generator and an electrically excitable auxiliary pressure source adapted to be connected to the brake force booster, a control and regulating electronic unit for detecting the wheel rotating pattern and for controlling the wheel braking pressure by pressure modulating valves. An electronic sensor is provided for detecting the relative movement between the pressure rod and the booster piston, the output signals of which are capable to influence the excitation of the auxiliary pressure source. This will permit the brake force boosting, if need be, to be effected independently of actuation forces put in manually, with anti-locking control/traction slip control functions being readily exercisable at any time.Type: GrantFiled: November 21, 1995Date of Patent: March 11, 1997Assignee: ITT Automotive Europe GmbHInventors: Hans-Jorg Feigel, Ulrich Neumann, Lothar Schiel
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Patent number: 5359854Abstract: 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: GrantFiled: August 5, 1993Date of Patent: November 1, 1994Assignee: Alfred Teves GmbHInventors: Wilfried Wagner, Lothar Schiel
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Patent number: 5297471Abstract: A construction and fabrication process for a two piece vacuum brake power booster housing is described which eliminates the surface tensions which are caused by forming during assembly to prevent damage to a protective surface finish. Localized radially weakened zones are each formed by two opposing tongues created by circumferential and axial slots which tongues in the assembled condition of the housing engage behind an outwardly and reversely formed rim (3) of the other housing half (1).Type: GrantFiled: August 28, 1992Date of Patent: March 29, 1994Assignee: Alfred Teves GmbHInventors: Peter Boehm, Wilfried Wagner, Lothar Schiel, Manfred Ruffer, Ralf Jakobi, Kai-Michael Graichen, Lothar Mattheis
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Patent number: 5181769Abstract: An automotive vehicle anti-lock brake unit reduces operator detectable pedal pulsations and vacuum requirements found in prior systems wherein the movable wall (7) of the vacuum brake power booster (1) is movable independently of the input member (4) and that a hydraulic chamber (50) being in active connection with the input member (4) is provided whose link (90) with a pressureless hydraulic fluid reservoir (11) allows to be shut off.Type: GrantFiled: February 22, 1990Date of Patent: January 26, 1993Assignee: ITT CorporationInventors: Lothar Schiel, Hubertus von Gruenberg, Wilfried Wagner, Manfred Rueffer, Christoph Jung
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Patent number: 5133592Abstract: An actuating unit for anti-lock brake systems for automotive vehicles comprised of a vacuum brake power booster and a tandem master brake cylinder, wherein on failure of the primary pressure chamber a force is simulated which is opposed to the actuating force. For this purpose, a compression spring (28) is arranged in the booster housing (10) which is brought into force-transmitting engagement with the input member only after a predetermined distance of travel of the input member has occurred (3, 23).Type: GrantFiled: October 5, 1990Date of Patent: July 28, 1992Assignee: Alfred Teves GmbHInventors: Wilfried Wagner, Lothar Schiel, Chistoph Jung
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Patent number: 5096268Abstract: Hydraulic brake systems are known wherein, for the purpose of brake control, a counterforce is built up in the booster (60) for actuation of the master brake cylinder which results in unloading the master brake cylinder. What is disadvantageous in the known system is that this counterforce also resets the pedal (pedal piston 3) so that vehement pedal movements will result from the control action. Therefore, our present invention suggests to interpose a transmission device (3, 4, 5, 6, 7) between the pedal and the actuator (booster) enabling to decouple actuator and pedal.Type: GrantFiled: March 28, 1990Date of Patent: March 17, 1992Assignee: Alfred Teves GmbHInventors: Lothar Schiel, Ralf Jakobi, Hans-Juergen Beilfuss, Manfred Rueffer, Harald Luetteke, Michael Vogt
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Patent number: 5080136Abstract: A valve arrangement has a housing in which are arranged an electromagnetically actuatable pilot valve controlling a differential pressure and a main valve actuatable by the differential pressure, the closure member of the main valve permitting a connection to be established between an outlet port and, alternatively, a first or a second inlet port. In order to keep the overall length of the valve arrangement as small as possible, the present invention provides a joint axis (29) of the pilot valve (5) and of the electromagnet (6) actuating the pilot valve (5) which is perpendicular to the axis (30) of the main valve (7) in a plane that is radially offset relative to the axis (30). In the inactive position, both compartments (23, 24) are exposed to the higher pneumatic pressure.Type: GrantFiled: October 9, 1990Date of Patent: January 14, 1992Assignee: Alfred Teves GmbHInventors: Lothar Schiel, Manfred Rueffer, Christoph Jung, Thomas Schuster
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Patent number: 5044161Abstract: A tandem master cylinder in which the primary piston and the secondary piston are configured in the shape of plunger pistons which are captivated to each other in the longitudinal bore of the cylinder housing. A cylindrical bushing is provided in the housing longitudinal bore and accommodates sealing cups sealing off the two pistons. The two valves which control hydraulic fluid flow are actuatable independently of each other.Type: GrantFiled: February 20, 1990Date of Patent: September 3, 1991Assignee: Alfred Teves GmbHInventors: Lothar Schiel, Juergen Bauer
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Patent number: 5031971Abstract: As an improvement on conventional brake systems of the type having a multiple-chamber vacuum brake force booster, a modification is disclosed to the effect that, in the brake releasing position, there is a pressure medium communication between a booster chamber and a simulator chamber. A modulator chamber requires only one external connection, thereby substantially simplifying the construction of the brake force booster and readily permitting an extension of the system's use to include traction slip control.Type: GrantFiled: June 1, 1989Date of Patent: July 16, 1991Assignee: Alfred Teves GmbHInventors: Peter Boehm, Wilfried Wagner, Lothar Schiel, Hans-Juergen Beilfuss
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Patent number: 5005918Abstract: In a slip-controlled automotive vehicle brake system, to reduce the number of the valves used, while simplifying the system construction, the wheel brake cylinders are connected to relief chambers (123, 133, 124, 134) of compensating cylinders (120, 130), the connection between the master-brake-cylinder pressure chambers (80, 90) and the relief chambers (123, 124, 133, 134) being closable during slip control.Type: GrantFiled: October 18, 1989Date of Patent: April 9, 1991Assignee: Alfred Teves GmbHInventors: Lothar Schiel, Manfred Rueffer
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Patent number: 4979426Abstract: A vacuum brake power booster for a slip-controlled hydraulic brake unit in which a major reduction of the costs of manufacture and of mounting and simultaneously an increase of its reliability in operation is provided. A first movable wall (7) within the booster housing is movable independently of the brake pedal input member (11) and a second movable wall (15) is provided at the first control housing part (52).Type: GrantFiled: October 23, 1989Date of Patent: December 25, 1990Assignee: Alfred Teves GmbHInventors: Lothar Schiel, Vincenzo Cappucci
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Patent number: 4966420Abstract: An anti-locking automotive vehicle braking unit wherein to achieve a reduction of the costs of manufacture and of mounting with an increase of reliability in operation, a pneumatic device (39, 40) is provided for venting of the first power chamber (5) and/or evacuation of the second power chamber (6) of the vacuum brake power booster (1) in the event of a slip control action. This renders the boosting power of the vacuum brake power booster effective or ineffective in a direction opposed to the direction of actuation of the master brake cylinder (2).Type: GrantFiled: May 15, 1989Date of Patent: October 30, 1990Assignee: Alfred Teves GmbHInventors: Lothar Schiel, Ralf Jakobi, Juergen Bauer