Abstract: An auxiliary power source, for example, an electric motor, supplies the power assist for a steering unit via a worm gear (15, 16). The worm gear (15, 16) drives clutch hubs (22 and 23) in the opposite rotational directions. The auxiliary power can be transferred to a driven shaft (3) via a common clamping sleeve (27) that can be expanded polygonally by two rows of clamping bodies (28 and 30) into one or the other clutch hubs (22 or 23). The clamping sleeve (27) is slitted into functional segments (A and B). Depending on the direction of rotation of the steering spindle (1), one or the other functional segments (A or B) of the clamping sleeve (27) is always active. The clutch units (2) run in a lubricant so that there is little wear and tear. This steering system can be made at reasonable cost and takes little space for installation.

Abstract: A flow regulator valve that is intended particularly for positive-displacement pumps for auxiliary power steering systems in motor vehicles contains in a valve borehole (1) a flow regulator piston (3) that is guided in an axially movable and sealing manner. Inside flow regulator piston (3), there is arranged a pressure limiting valve (18) whose closing body (19) is pressed against a valve seat (22) by the force of a spring (21). The force of spring (21) is adjusted by a headless pin (23) which--in its adjusted position--is secured with respect to flow regulator piston (3) by a locknut (25).

Abstract: A flow regulating valve for rotation piston pumps to regulate a useful flow, especially for auxiliary power steering in motor vehicles, contains in a valve core (2) an axially-movable, spring-loaded flow regulating piston (3). On one front surface (4) of the flow regulating piston (3), there is a control edge (14) by means of which a flowoff cross section in a flowoff duct (15) can be altered. To reduce the flow noises, control edge (14) has a rounded portion (17) at the transition to the generated surface (16) of the flow regulating piston (3). In addition, control edge (14) reveals a negative bezel (18). A positive bezel (21) is arranged between this negative bezel (18) and the rounded portion (17) that adjoins generated surface (16).

Abstract: A high fidelity loudspeaker having a driver, e.g., a woofer in a housing, is rear-loaded by a folded passage, i.e., a transmission line, closed at one end by a loudspeaker and open to the environment at the other end. The line has a length equal to the quarter-wave length of the lowest desired frequency. Angled 45.degree. reflectors are used in the transmission line whereby an advancing planar wave from the rear of the speaker is produced from the rear hemispherical wave. The transmission line is conventionally stuffed with fibrous material, such as long fiber wool, which attenuates resonances, absorbs high frequencies and acts as a low pass filter. The acoustic output at the open end of the transmission line has high frequencies filtered out and a low frequency planar wave at maximum possible amplitude emitted in close phase with the front wave of the loudspeaker.

Abstract: This invention relates to a pressure turnoff device in the terminal positions of the steering deflection in an auxiliary power steering. In steering systems that reveal a working piston (2) that can be shifted in the steering housing, one inserts this turnoff device in a passage borehole (17) of working piston (2). For each steering direction, one provides a turnoff valve (20, 22 or 21, 23) which can be activated by a plunger (24 or 25) that bumps into a wall (30 and 31). To avoid any time consuming adjustment work on the turnoff valves (20, 22; 21, 23), the walls (30 and 31) contain screwed-in bolts (40 and 41) with pressed-on sleeves (32 and 33), with the sleeves working as stops. After installation of the auxiliary power steering in the vehicle, one can automatically press the sleeves (32 and 33) into the terminal position corresponding to the wheel steering angle.

Abstract: In a load change-over gear with infinitely variable transmission, which includes a linkage gear (1) driven by a main drive shaft (5), a control gear (2) associated with the linkage gear (1), as well as a switching or change-over gear (4) series-connected after the linkage gear (1), linkage shafts (10 and 11) can be alternately coupled to the switching gear (4). To create a variable switching logic and to save structural components of the switching gear (4), a superposition gear (3) is series-connected after the linkage gear (1) whose input shaft (14) can be coupled alternately to linkage shafts (10 and 11). Superposition gear (3), in which the main drive shaft rpm can be superposed on the rpm of the input shaft (14), in turn includes a linkage shaft (21) that can be coupled directly to a main output shaft (24) or to the switching gear (4).

Abstract: A serrated-shaft connection between a shaft (1) and a hub (4) has a large number of teeth (2, 5) that are located on the outer circumferential surface of the shaft (1) and the inner circumferential surface of the hub (4), respectively. The profiles (6) of the teeth (5) of the hub (4) are bent convexly in cross section. In such a connection, it is essential that the profiles (3, 6) of the teeth (2, 5) of the shaft (1) and the hub (4) should be bent differently in such a way that the profiles (3) of the teeth (2) of the shaft (1) will have distances above the top of the teeth that are different from those above the top of the teeth (5) of the hub (4). As a result, the tooth profiles of the shaft and the hub can mesh with each other during assembly so that a compressive connection that fits with great precision is obtained.

Abstract: A rotary slide valve, especially for auxiliary-power steering devices for motor vehicles, has a rotary slide (2) rotatable opposite a control bushing (1). The control bushing (1) and the rotary slide (2) have guiding longitudinal grooves (3, 4, 7, 8) that work together for directing a pressure agent from a pressure agent source to and from a servomotor. Guiding edges (5 and 10 and 6 and 11) of the guiding longitudinal grooves (3, 4, 7, 8) of the control bushing (1) and the rotary slide (2), working together, are placed parallel with each other. The guiding edges (5, 6) of the guiding longitudinal grooves (3, 4) of the control bushing (1) and the guiding edges (10, 11) of the rotary slide (2) are positioned conically with respect to each other longitudinally.

Abstract: A pressure relief valve (1) has a relief piston (5) for a large stream of oil and a precontrol piston (11) for a small stream of oil for influencing the point of actuation of the reliefing piston. Both pistons (5 and 11) are part of seat valves. The pressure relief valve is to be constructed so that the maximum pressure adjusted at high oil viscosity declines. In that way, the hydraulic apparatus containing the pressure relief valve is protected against overloading at low temperatures. For that purpose, the precontrol piston (11) has a bushing-shaped extension (26) that projects into a drilled hole (25) that is connected with an outlet (23). Furthermore, a ring surface (A1) is provided at the precontrol piston (11) that acts in the direction of opening. By means of the extension (26), a pressure-regulating section (27) that is dependent upon viscosity comes into play that generates a dynamic pressure that acts upon the ring surface (A1) when the oil is cold.

Abstract: An auxiliary power steering system, especially for motor vehicles is provided with a pump (6), a servomotor (5) supplied with flow under pressure from a distribution valve (4) and with a quantity regulating valve (2), by means of which a regulated pressure is applied to a pressure control valve (3) for controlling pressure flow to cylinder chambers of a servomotor (5). The flow under regulated pressure is supplied to the servomotor cylinder chambers (17, 18) via the distribution valve (4) and initial pressure regulation is effected by the pressure control valve (3) wherein initial flow pressure is at less than the full pump operating pressure.

Abstract: This invention relates to a radial piston pump in whose suction bore (22) a load regulator (24) is inserted. The pump is to be regulated so that a constant stream and, as required, a variable large regulating stream will be available. For this purpose, a spool valve (26) that can be activated electromagnetically is inserted in a bore (23) that intersects the suction bore (22) and that spool valve can establish a connection to a suction duct (28) that is connected to a cam chamber (14) to make the regulating stream available by means of a collar (33). From suction bore (22) there furthermore branches off a shutter bore (34) that is likewise connected to the cam chamber (14) via a ring groove (35) and additional bores (36) in the pump housing (3). Shutter bore (34) limits the constant stream. The regulating stream is supplied to a consumer with fluctuating power consumption, for example, a hydrofan, that is powered with an rpm proportional to the cooling water temperature.

Abstract: A steering gear, especially for motor vehicles, has a steering worm sector shaft (10) including a toothed quadrant and a steering nut (4) displaceable axially by a steering shaft and engaging with the toothed quadrant with a steering rack section (7). To eliminate the toothing play occurring between the toothed quadrant and the steering rack section (7), a spring pressure element (14) is provided that is located outside of the surface plane that includes the axis of the steering shaft and is perpendicular to the toothing surface plane of the steering rack section (7), and that exerts a twisting force on the steering nut (4) in the straight-ahead-travel position of the steering gear. The spring pressure element (14) includes two spring washers (15, 16) located concentrically with each other on the steering worm sector shaft (10). The two spring washers (15, 16) are connected with each other by a connecting arm (17).

Abstract: The invention relates to an auxiliary power steering system, especially for motor vehicles having a double acting servocylinder with two working chambers and a servopiston. A hydraulic steering limitation device has a valve that coacts with the servopiston responsive to a predetermined extent of power stroke to open a flow path from the pressurized working chamber to the tank connected working chamber to promptly stop the power stroke leaving the servopiston in position for prompt reversal of steering direction under pressure power. A stationary flow channel member extends the substantial length of the servocylinder and passes through a bore in the servopiston with which it has a sliding relationship. At a predetermined end of a power stroke, bores and a passage in the channel member communicate with the working chambers of the servocylinder to equalize the pressure at tank pressure for stopping the power stroke.

Abstract: In a mechanical drive mechanism for a supercharger of an internal combusion engine, a rotor fastened to a rotor shaft is driven by the internal combustion engine's crankshaft, an electromagnetically activated separating clutch and a step-up gear. To create favorable structural dimensions of the supercharger drive mechanism in axial and radial extension and a favorable support for an input shaft of the step-up gear, the step-up gear is a planetary gear, with the input shaft supported in an axially projecting collar on the transmission case and the electromagnetically activated separating clutch located on the periphery of that collar. A clutch disk is to be located on one side of this bearing and a ring gear is to be located on the input shaft on the other side.

Abstract: Method and apparatus for cleaning fuel injector systems of internal combustion engines which comprises avoidance of burns and possible injuries in setting up the conventional system apparatus in the engine compartment. The present method is characterized by setting up the required connections and apparatus at the rear of the vehicle in an area isolated from the region under the vehicle hood. The invention has other advantages. In particular, filter replacement in the isolated area subsequent to completion of the cleaning process is effected by a novel aspect of the method which involves filter removal as a step in the method. In a conventional method the filter is left in place but ultimately replaced, for comprehensive maintenance of the fuel system, as an additional step. Another advantage of the invention is the method of detecting leakage in injector and fuel flow systems and to detect the extent of clogging of individual injectors to determine the need for replacement.

Abstract: A potentiometer for the redundant measurement of the angle of rotation of a shaft compared with a fixed member has two resistance paths located concentrically with each other on a fixed disk. Two collector paths having the shape of circular rings are located concentrically with each other on a disk situated parallel to the fixed disk and rotating together with the shaft. Two slide contacts connected with the collector paths are in contact with the two resistance paths. Two redundant measured values are tapped at two terminal contacts fastened to the fixed disk that are in contact with the collector paths through two slide contacts.

Abstract: An auxiliary power steering mechanism has a rotary valve that includes a rotary member integrally formed with the steering shaft of the vehicle and a fixed valve sleeve integrally formed with a threaded spindle. The rotary member contains a plurality of radial hydraulic fluid return bores arranged in two parallel rows with the bores of each row being spaced longitudinally. A guide groove in the valve sleeve, which is connected with a power cylinder, is assigned to each row of bores. An additional radial return bore is arranged in the middle of the two rows of bores and has a fixed residual cross section. All of the return bores include flat portions of different circumferential lengths to control the build-up of pressure in a surge chamber. The hydraulic return cross section produced by the bores is varied by a piston valve arranged in a concentric bore in the rotary member. The piston valve can be adjusted as a function of a pressure in accordance with speed.

Abstract: In a mechanical driving mechanism of a supercharger (1) for an internal combustion engine, which, starting from the internal combustion engine, acts on a rotor shaft (12) of a rotor (14) located on a supercharger housing through a planetary gear assembly (3) that is geared up, a compact construction of the driving mechanism and a balancing out of vibration between a primary shaft (2) and the rotor shaft (12) can be achieved. For that purpose, a ring gear (6) is propelled by the primary shaft (2), while the rotor shaft (12) that receives a sun wheel (8) is accommodated in a hub part (15) of a pinion cage (16) of the planetary gear assembly (3).

Abstract: In multifront and rear steering systems a problem exists due to fluid leakage which causes lack of synchronization in return to straight ahead steering position between the front and rear steering linkages causing inaccurate centering of the rear steering linkage in response to manual control of centering of the front steering linkage, where the front steering power is hydraulic and the rear steering power is hydrostatic. The invention provides the particular novelty of a centering device for the rear wheel steering linkage responsive to directional manipulation of the front wheels at the will of a driver from a steered position to a straight ahead position. In one embodiment a power steering cylinder is coupled to the rear steering linkage for effecting steering movement or return. Also connected to the rear steering linkage is a cylinder having a locking device and the centering device connected to actuate the rear steering linkage pursuant to automatically operating circuitry, within the skill of the art.

Abstract: The invention is concerned with a device that cuts off pressure in the final positions of the steering movement in an auxiliary-power steering device. In steering devices that have movable working pistons in the steering gear housing, this cut-off device is installed in a through drilled hole in the working piston. A by-pass valve that is activated by a push rod touching the wall of the housing is provided for every direction of steering. To avoid time-consuming adjustment work on the by-pass valves the walls contain bushings located opposite the push rods that are automatically pushed into the final positions corresponding to the wheel steering angle after the auxiliary-power steering device is installed in the vehicle. That happens as a result of rotating, first without auxiliary power, against the wheel limit stops, with the front axle jacked up, after the preliminary installation of the bushings in their drilled holes.