Abstract: A trigger circuit for an electromagnetic device, in particular a solenoid valve of an injection system for an internal-combustion engine, has a control element for causing excitation of the electromagnetic device to be lowered at least once and then raised after the electromagnetic device is activated. The control element has a delay circuit which slows down the rate at which excitation of the electromagnetic device changes during the lowering and/or raising action.

Abstract: A fuel injection system, for internal combustion engines in which fuel is brought to high injection pressure and distributed via magnet valves to the various fuel injection locations with the aid of a simple, unregulated high-pressure injection pump; high-pressure injection does not take place until a fuel injection quantity control valve, connected to the distribution of the high-pressure side, has closed a relief line. It thus becomes possible to vary the injection time to the maximum possible extent, without entailing major structural expense.

Abstract: It is proposed in the case of an electromotive power steering as a steering aid for motor vehicles and similar, particularly for the speed range during parking (parking power steering), having a reduction gear between the servo-motor and the steering column or the drive leading on to the mechanical wheel displacement, that at least one clutch block be so arranged that it creates a drive connection from the servo-motor drive to the steering gear side of the steering column when, upon a moment being exerted manually at the steering wheel, a pawl connected to the steering wheel side of the steering column produces the requisite clutch pressure by mechanical action on the at least one clutch block, while the gear wheels acted upon by the clutch are formed as ring gears fitted to a carrier flange which is joined firmly to the driven section of the steering column so that it cannot rotate.

Abstract: A fuel injection pump of a distributor type for internal combustion engines including, a pump plunger guided within a pump cylinder, which forms a pump chamber and which is driven to perform reciprocating and rotating motion by a driving gear which is submerged in a lubricating oil bath. The pump plunger has a distribution hole which is in contact with the pump chamber and which sequentially links this chamber, during the compression stroke of the pump plunger, to injection jets. The fuel filling of the pump chamber takes place via a magnetically operated valve, which is open during the intake stroke and closed during the compression stroke of the pump plunger.

Abstract: A hydraulic engine valve control having a reservoir chamber, which is assigned to a pressure chamber of a valve tappet and has a reservoir piston, which at the same time serves as a valve by which the reservoir chamber can be disconnected from the pressure chamber. The reservoir piston is displaceable out of its position of repose into its reservoir function by a hydraulic control device that cooperates with a magnet valve. In this process, it is also attained that a plurality of valve control units of one internal combustion engine can be controlled via a single magnet valve, if their various control times do not overlap.

Abstract: In a reservoir-type fuel injection system, fuel can be supplied under pressure by a charge pump to two separate pressure reservoirs and the pressure reservoirs communicates via separate valve assemblies with injection nozzles via lines. By means of the separate reservoirs, overlapping of pre-injection and main injection events in different cylinders can be avoided.

Abstract: An electro-magnetic on-off valve for controlling the opening area of a fluid line, in particular for fuel injection pumps, having a valve element constructed on a valve needle, said valve element cooperating with a valve seat. The valve needle is connected to a magnetic armature of an electromagnet, the magnetic armature moving in a fluid for the purpose of achieving high switching speeds, and being sealed with respect to the liquid-conducting region of the valve. For any purpose of extensive damping of the rebound oscillations which occur when the valve closes and lead to the re-opening of the valve, the connection between the magnetic armature and valve needle is produced by a coupling and which is designed in such a way that after the rebound of the valve element against the valve seat occurring when the valve closes, the magnetic armature and the valve needle oscillate in phase opposition with respect to one another.

Abstract: A hydraulic drive control device for internal combustion engines, having a reservoir magnet valve for controlling a volume of oil in a stroke transmission chamber, in order to control a timing cross section of the engine valve, wherein the magnet valve is closed when without current, and the valve member, embodied as a reservoir piston, is loaded by a reservoir spring acting as a closing spring.

Abstract: A hydraulic valve control with a (hydraulic) fluid reservoir allocated to a pressure chamber of a magnetic lifter, with a reservoir piston, reservoir, and reservoir spring, in which the pressure chamber is arranged between a cam piston actuated by the driving cam and a valve piston, the latter acting in conjunction with the engine valve, and in which the cam piston is configured as a hollow piston, in the cavity of which the fluid reservoir is arranged.

Abstract: An electrically controlled fuel injection pump for internal combustion engines, in particular for direct fuel injection in engines having externally supplied ignition. A plurality of pump pistons driven by drive cams at a constant stroke and each leading into one cylinder bore, pump the fuel that has been brought to injection pressure in an associated pump work chamber to injection valves. A plurality of pump pistons are positioned side by side, radially of the camshaft. The work chambers of the pump pistons are connectable via a rotary slide valve to lines which lead to the injection valves and optionally to supply lines for supplying fuel to the work chambers of the pump pistons and the rotary slide can be driven in synchronism with the camshaft.

Abstract: A reservoir fuel injection system, in which fuel is deliverable under pressure to a reservoir having a line carrying fuel under pressure from the reservoir via a valve assembly to at least one injection nozzle and having an adjustable throttle for varying the quantity of fuel supplied to the reservoir, is embodied such that the throttle upon attainment of the maximum pressure in the reservoir and/or the maximum reservoir volume, enables the aspiration of a minimum quantity of fuel in an intake line of the charge pump and/or connects the pressure line at least partly with the intake line; and/or the pressure reservoir, upon attainment of the maximum pressure in the reservoir and/or the maximum reservoir volume, opens an outflow cross section.

Abstract: An apparatus for adjusting an angular rotational relationship of a camshaft, serving in particular to actuate gas exchange valves of an internal combustion engine, with respect to its drive element, which apparatus has two control motors acting counter to one another, the mutually corresponding movable walls of which are coupled to one another, wherein to reduce an expense for furnishing control fluid and generating pressure in this control fluid the work chambers of the control motors are on the one hand both connected via a respective check valve, to a control fluid pressure source and on the other hand can be made to communicate selectively with one another directly via a control valve or can be disconnected from one another via this valve, so that torque fluctuations of the camshaft are exploited for generating pressure in one of the work chambers at a time and the resultant pressure is exploited purposefully at certain times for adjustment with subsequent relocking of the work chambers.

Abstract: A fuel injection pump for internal combustion engines, having a piston driven for simultaneous reciprocation and rotation and embodied both as a pump piston periodically pumping fuel and as a distributor piston rotatable in the guide bore. The piston includes distributor openings that discharge at its jacket face and communicate with various injection nozzles as a function of the rotational position of the distributor piston. During the supply stroke of the pump piston, a branch line is connected to the work chamber of the pump piston, which branch line is connectable, via separate distributor openings of the distributor piston with at least one injection nozzle different from the injection nozzle connected directly, via a different distributor opening to the work chamber (5).

Abstract: In a fuel injection apparatus having an injection nozzle opening at predetermined pressure, to which fuel is deliverable under pressure, the injection nozzle chamber communicates with a fuel supply line with the interposition of a check valve closing outward; the pressure in the fuel supply line is lower than the opening pressure of the injection nozzle. Furthermore, the injection nozzle chamber communicates with a work chamber of a spring-loaded work piston, the displacement motion of which for increasing the pressure in the nozzle chamber above the opening pressure of the injection nozzle is effected by relieving a second work chamber of the spring-loaded work piston under the influence of spring force.

Abstract: Fuel injection nozzle for internal combustion engines, in which a pre-injection is effected with directed fuel sprays and then a main injection is effected with an additional fuel umbrella spray. The individual phases are to run in exact timed sequence and the main injection is to be separated from the pre-injection by way of a pressure step. For this purpose, a valve sleeve (34) is placed on a valve needle (18) which opens in the flow direction of the fuel and is provided with a closing head (20), the valve sleeve (34) being pressed, according to the invention, by an additional spring (50) against the closing head (20) with which it controls an annular valve gap for the umbrella spray. The valve sleeve (34) is also provided with lateral spray openings (62) through which the directed sprays exit during the pre-stroke in which the valve sleeve (34) moves with the valve needle (18) under the influence of the additional spring (50).

Abstract: A fuel injection pump is proposed in which over a first portion of the supply stroke of the pump piston fuel for the main injection is pumped via a distributor line and a distributor groove into one at a time of a plurality of fuel injection lines. In a second, remaining portion of the pump piston supply stroke, on the same cam flank, fuel is then pre-stored in a reservoir, controlled by a first electrically controlled valve and a second electrically controlled valve and by one of a plurality of longitudinal control grooves, which fuel subsequently, before the beginning of the next main injection determined by the closure of the first electrically controlled valve, is pumped via a second distributor line into the next succeeding injection line.

Abstract: A tank bleeder valve for the metered admixture of volatilized fuel to the fuel-air mixture of an internal combustion engine has a valve housing with inflow and outflow necks, between which an electromagnetically actuatable seat valve is disposed. The inflow neck communicates with the vent neck of a fuel tank, and the outflow neck communicates with the engine intake manifold. To prevent dieseling of the engine after the ignition is switched off, the seat valve is embodied such that it is very tightly closed when there is no current. To this end, the valve opening of the seat valve is embodied as an annular gap, coaxially surrounded on the inside and outside by a valve seat in the form of an annular double seat. The valve element of the seat valve is embodied as an annular disk of magnetically conductive material, which is loaded with a closing force acting in the closing direction of the seat valve. The annular disk simultaneously acts as the armature of the electromagnet.

Abstract: A hydraulic valve control apparatus for internal combustion engines, having a reservoir magnet valve for controlling a volume of fluid in a stroke transmission chamber, in order to control a time cross section of a motor valve, wherein a valve element, embodied as a reservoir piston is loaded by a reservoir spring that serves as a closing spring, and a permanent magnet is provided that keeps the valve element in an open position counter to a force of the closing spring when the magnet coil is without current.

Abstract: An electrically controlled fuel injection pump for internal combustion engines, in particular for direct fuel injection in engines having externally supplied ignition contains a plurality of pump pistons driven by a single common cam. The pumping quantity of fuel is delivered by pumping pistons is controlled via a rotary slide valve to the injection nozzles at the injection sites of the engine, wherein the quantity control is effected by an electrically controlled valve. An axial conduit of the rotary slide which discharges into control bores or control grooves distributed over the circumference of the rotary slide and cooperates with the pump work chamber and the pressure lines to the injection sites and is adjoined by at least one further control bore or control groove which communicates with a pressure reservoir. By this means, a preinjection, separate from a main injection, is made possible at the top dead center charge change.

Abstract: A hydraulic valve control device for internal combustion engines having a magnetic valve for controlling the opening and closing time of an inlet or outlet valve in which the fluid pressed out of the stroke transmission chamber by the engine valve springs is stored in a reservoir chamber integrated with the magnetic valve; the reservoir chamber, by displacing the valve member backward, functions as a reservoir piston in the opening direction. A spring acting upon the valve member in the closing direction of the magnetic valve presses the fluid back into the stroke transmission chamber, which now is expanding one again. The magnetic valve communicates with the stroke transmission chamber through the shortest possible fluid conduit.