Patents Assigned to Alfred Teves GmbH
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Patent number: 5249853Abstract: In brake systems with a large boosting factor, relatively high pressures in the tandem master cylinder during an anti-lock control operation caused by start-up of a pump are prevented by an adjusting member which is controlled in response to the wheel braking pressure, to act upon a pressure-reducing valve inserted upstream of a power booster, so as to limit the booster pressure.Type: GrantFiled: April 14, 1992Date of Patent: October 5, 1993Assignee: Alfred Teves GmbHInventors: Hans-Dieter Reinartz, Helmut Steffes
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Patent number: 5249646Abstract: Resetting of the actuator piston of a disc brake by an adjusting device is enabled by sliding movement of the piston so that a piston position may be reset without any special arrangement for turning an adjusting spindle (5), or by turning the piston itself. The adjusting spindle (5) is released for rotation during resetting, while the adjusting spindle (5) is normally fixed against rotation yet axially slidably during the time of hydraulic actuation and during manual braking.Type: GrantFiled: July 23, 1992Date of Patent: October 5, 1993Assignee: Alfred Teves GmbHInventor: Rudolf Thiel
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Patent number: 5239133Abstract: A fitting arrangement and process for the guidance and the fixing of one or more electric lines passing into a cover lid, as far a valve block for electromagnetically switchable hydraulic valves. The lines are individually molded into a conductor accommodating element, which in turn is fit and sealed in an opening within the cover lid. The conductor accommodating element is retained in the cover lid opening by a protective cap having protrusions to lock the element in the opening, drawing a collar against the opposite side of the cover lid. The lines are bent over and exit an open end of the protective cap, which is locked in position by a ridge snapping into a depression in the cover lid as the cap is slid into grooves on the accommodating element.Type: GrantFiled: August 5, 1991Date of Patent: August 24, 1993Assignee: Alfred Teves GmbHInventors: Erhard Beck, Albrecht Otto
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Patent number: 5231916Abstract: For the elimination of distortion of a thin walled cold formed brake piston the piston (1) perimeter wall (5) is stiffened by one or more formed grooves (3) and one or more inwardly projecting ridges each formed by a corresponding groove. The shaping of the groove is carried out so that the wall thickness within the critical range (2) is at least equal to the wall thickness of the piston wall (4). The grooves may be used for securing a sealing cup, a rubber seal and/or a retaining spring for the brake pads.Type: GrantFiled: October 1, 1991Date of Patent: August 3, 1993Assignee: Alfred Teves GmbHInventor: Rolf Weiler
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Patent number: 5231913Abstract: A process for adjusting the travel sensor for a brake power booster movable wall is disclosed to compensate for tolerance variations, in which a fixed stop is installed to engage the output member upon applying a predetermined input force to shift the movable wall to a test location. The distance to the test location of the movable wall from a booster housing reference surface is measured with a measuring instrument installed temporarily in the booster housing opening normally receiving the travel sensor. The tips of the travel sensor is positioned at the test location with the travel sensor in the corresponding signal condition either by using an appropriately dimensioned replaceable tip or sensor holder, or by use of an adjustable length sensor holder.Type: GrantFiled: October 6, 1992Date of Patent: August 3, 1993Assignee: Alfred Teves GmbHInventors: Hans-Dieter Reinartz, Helmut Steffes, Stefan Risch
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Patent number: 5221127Abstract: A circuit configuration for an anti-lock brake system, which receives input from wheel sensors positioned on the driven wheels, comprises a monitoring circuit (7) which triggers a test cycle (duration T.sub.Test) when the two wheels of a driven axle signal instability for more than a predefined time span (T) during a control cycle. By way of the test cycle, braking pressure is introduced into the wheel brake of the instantaneously slower wheel (v.sub.1, v.sub.min -wheel) of the driven axle and the reaction of the driven wheels to the braking pressure delivered is assessed.Type: GrantFiled: December 11, 1991Date of Patent: June 22, 1993Assignee: Alfred Teves GmbHInventors: Norbert Ehmer, Rolf Spaeth, Thomas Striegel, Harald Kahl, Thomas Proeger, Wolfgang Kling
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Patent number: 5219442Abstract: The proposed brake system eliminates breather bores and central valves in the working pistons of the master brake cylinder and establishes short-term pressure fluid connections between the supply reservoir and the working chambers when the brake is not applied by controlling replenishment valves and outlet valves. Therefore, connection of the supply reservoir to the working chambers of the working cylinder is constituted solely via electromagnetically controllable connections.Type: GrantFiled: September 14, 1992Date of Patent: June 15, 1993Assignee: Alfred Teves GmbHInventors: Jochen Burgdorf, Gerd Klostermann, Nabil Henein
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Patent number: 5215359Abstract: 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) back 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: GrantFiled: May 14, 1991Date of Patent: June 1, 1993Assignee: Alfred Teves GmbHInventors: Jochen Burgdorf, Hans-Dieter Reinartz, Helmut Steffes, Joachim Maas, Dieter Dinkel
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Patent number: 5215358Abstract: A circuit configuration for an anti-locking brake system controlled according to a multiplex process. The circuit configuration is designed such that upon commencement of an anti-locking control, if the first wheel to become instable is a front wheel (VL) the reswitching of the wheel valves (4) leading to the rear wheel brakes (22, 23), is delayed by a predetermined period of time of about 4 to 20 milliseconds. This therefore prevents the pressure from excessively rising upon commencement of the anti-locking control.Type: GrantFiled: August 29, 1991Date of Patent: June 1, 1993Assignee: Alfred Teves GmbHInventors: Hans-Juergen Beilfuss, Michael Vogt
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Patent number: 5213482Abstract: A radial piston pump is described with dual pistons which are slidingly accommodated within a bushing coupled end to end to a valve body. Automatically controlled suction and discharge valves for a pressure chamber are arranged one behind the other in the longitudinal axis of the pump. The pistons are sealed by means of elastomeric seals compressed by an end of the valve body and bushing under pressure of a threaded sealing plug installed in the pump housing. The valves, valve body and bushing form a cartridge separately assembled and installed as a unit in the housing. The threaded sealing plug is formed with a damping chamber for damping of pressure pulsations.Type: GrantFiled: August 29, 1991Date of Patent: May 25, 1993Assignee: Alfred Teves GmbHInventors: Hans D. Reinartz, Peter Volz, Bernd Schopper, Dalibor Zaviska
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Patent number: 5211019Abstract: An actuating unit for hydraulic automotive vehicle brake systems, including a vacuum brake power booster, a master brake cylinder, and an operating element, configured to achieve a reduction of overall axial length and a simultaneous reduction of the weight and a relief of the booster housing from forces of reaction. The brake pedal (3) operating arm is interposed between the vacuum brake power booster (1) and the master brake cylinder engaging an axially extending member interconnecting a control valve piston and a master cylinder piston (2). The booster housing (10) and fluid reservoir (4) are mounted within the engine compartment while the master cylinder housing has a flange portion fixed to the splashwall and a main portion which projects out of the engine compartment through the splash wall, and into the passenger compartment. The hydraulic reaction forces are absorbed directly from the master cylinder housing into the splashwall rather than through the booster housing.Type: GrantFiled: March 13, 1991Date of Patent: May 18, 1993Assignee: Alfred Teves GmbHInventor: Jurgen Bauer
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Patent number: 5210692Abstract: For evaluating the wheel speed signals (V(n)) required by an anti-locking or traction slip control system, a basic speed (VBas(n)) is derived from the speed signals of the individual wheels, and a wheel factor (Ki(n)) is formed for each wheel which, when multiplied by the wheel speed, forms the basic speed. For further signal processing, the wheel speed multiplied by the appertaining wheel factor is used in lieu of the actual wheel speed to form the reference speed, and the control signals.Type: GrantFiled: May 4, 1990Date of Patent: May 11, 1993Assignee: Alfred Teves GmbHInventors: Helmut Fennel, Michael Latarnik
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Patent number: 5209552Abstract: An anti-lock-controlled brake system with a auxiliary-force-assisted braking pressure generator accommodates a master cylinder in which at least one wheel brake is connected to a main pressure line, with an auxiliary hydraulic pressure pump connected to an auxiliary pressure line the system further includes wheel sensors and electronic circuits for detecting the rotational behavior of the wheels and for generating electric braking pressure control signals which, for the purpose of slip control, control the electromagnetically operable inlet valves and outlet valves inserted into the pressure medium lines. A pressure limiting valve is responsive to the pressure of the auxiliary pressure pump and to a pressure acting on the wheel brake to control the outlet pressure of the pump.Type: GrantFiled: August 27, 1992Date of Patent: May 11, 1993Assignee: Alfred Teves GmbHInventors: Hans-Dieter Reinartz, Helumut Steffes
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Patent number: 5209553Abstract: An anti-locking hydraulic brake system is described which includes a pump, the output of which flows through a pressure valve (20), a damping chamber (24), a check valve (28) and a throttle (3I) and is delivered to a pressure connection in communication with the wheel brake conduit. To ensure, in a compact structural design, a noise-minimizing hydraulic pressure source, while avoiding a flow back of pressure fluid from the brake system into the damping device, a check valve (28) is integrated into the damping device. A pressure valve is integrated with the check valve and damping chamber, with an elastomeric elastic member disposed in the damping chamber to absorb pressure pulsations.Type: GrantFiled: November 13, 1990Date of Patent: May 11, 1993Assignee: Alfred Teves GmbHInventors: Jochen Burgdorf, Anton David, Georg Obersteiner, Hans-Albrecht Guse, Ulrich Zutt, Bernd Schweighoefer
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Patent number: 5209255Abstract: An accumulator loading valve is provided which is adapted for elevated pressures, which requires but little space, and which has a pump connection (1), a reservoir connection (20), a priority valve (7) between the consumer connection and the accumulator connection, and a pilot valve (4) being controlled by the accumulator pressure. The improvement is that the operating piston of the two-position pilot valve (4) is prestressed by a spring (28) having a constant spring rate and that the cross section of the valve inlet (19) is smaller than the cross section of the valve discharge (20).Type: GrantFiled: November 16, 1990Date of Patent: May 11, 1993Assignee: Alfred Teves GmbHInventor: Gottfried Dehio
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Patent number: 5205585Abstract: An occupant safety device for automotive vehicles is proposed which saves mounting space and which is comprised of a roll bar (2, 33, 34) allowing both to be brought into its extended final operative position by a signal being generated in the event of severe impact by means of elastic prestressing means (13, 27) and to be adjusted into the extended final operative position or into the final lowered position by means of an additional drive (5, 6, 7, 8, 9, 17, 18), the movement of the roll bar (2, 33, 34) taking place substantially in a plane which runs at right angles relative to the longitudinal axis of the vehicle, and that at least one headrest (15) is provided at the roll bar (2, 33, 34).Type: GrantFiled: April 10, 1991Date of Patent: April 27, 1993Assignee: Alfred Teves GmbHInventors: Gerhard Reuber, Achim Braun, Horst Stupperich, Manuela Kahlert
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Patent number: 5201175Abstract: A hydraulic actuating system and method comprises a pump which continuously circulates hydraulic fluid out of a reservoir into a pressure line limited to a predetermined maximum pressure by a pressure-limiting valve and a control valve connected to the pressure line controlling flow of hydraulic fluid to an operating cylinder. A clearance volume in communication with the pressure line collects compressed air entrained in the hydraulic fluid flow which upon opening of the inlet valve expands to displace a portion of the volume of flow of hydraulic fluid required for actuation of the operating cylinder.Type: GrantFiled: September 24, 1991Date of Patent: April 13, 1993Assignee: Alfred Teves GmbHInventors: Manfred Kahrs, Gerhard Kunz, Franz Fleck, Gerhard Schudt
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Patent number: 5199769Abstract: A valve, is disclosed having a valve seat (2) receiving a valve tappet (1), the valve tappet (1) being axially movably guided in a valve housing (10), as well as comprising a flow in (3) controllable between the valve tappet (1) and the valve seat (2) and being in communication with the pressure-fluid channels (11) in the valve housing (10). In order to minimize the valve's operation noise, the present invention arranges to radially load the valve tappet (1) relative to the valve seat (2) under the action of a transverse force F, an asymmetric flow space prevailing in the flow path (3).Type: GrantFiled: May 14, 1991Date of Patent: April 6, 1993Assignee: Alfred Teves GmbHInventors: Erhard Beck, Bernd Schweighofer, Horst Kornemann
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Patent number: 5197788Abstract: A circuit configuration for an anti-lock brake system, including a master cylinder (1) with a travel switch (27, 27') and an electromotively (31, 31') driven hydraulic pump (32, 32'), disposes of a "pump control" (45) which switches on the drive motor (31, 31') of the hydraulic pump (32, 32') in dependence on the vehicle deceleration and on the pressure fluid requirement during an anti-lock controlled braking operation, or on corresponding criteria and test results.Type: GrantFiled: May 14, 1991Date of Patent: March 30, 1993Assignee: Alfred Teves GmbHInventors: Helmut Fennel, Gunther Buschmann, Norbert Ehmer, Frank Jourdan
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Patent number: 5195322Abstract: The present inventive relates to a master cylinder (1 ) with elastomeric central valves (20) which can be opened in opposition to a relatively high pressure in the pressure chambers (8 and 9) without damage. The sealing face (29) of the valve member (26) is in the form of a hollow cylinder protruding slightly from the broad head portion (24) of the valve pin (21). The valve member sealing face does not, as has been conventional practice, extend radially inwardly past the head portion (24) in the direction of the central bore (13) to avoid being drawn into the bore (13).Type: GrantFiled: December 6, 1991Date of Patent: March 23, 1993Assignee: Alfred Teves GmbHInventors: Klaus Bergelin, Harald Koenig, Bernhard Hammes