Robert Boschgmbh

Peter Knorreck

Manfred Kramer

Walter Hafele

Wilfried Merkel

Karl Kirchweger

Norbert Muller

Wolfgang Kuhne

Rolf Ebert

The fuel injection pump having a pump piston, which has a forward segment and a rear segment of larger diameter The pump piston operates in a cylinder bore with two bore segments of different diameters, corresponding to the pump piston diameters. In the forward bore segment, the forward piston segment defines a pump work chamber, which can be made to communicate with a fuel reservoir via an electrically actuated valve. The rear segment and the rear piston segment of defines an annular work chamber, which communicates with a fuel conduit and a distributor body communicates, in an intake stroke of the pump piston, with a fuel-filled suction chamber. In the supply stroke of the pump piston, the piston work chamber is reduced in size and fuel is positively displaced from the piston work chamber and pumped into the fuel reservoir. In the intake stroke of the pump piston, the pump work chamber is filled from the fuel reservoir. From the pump work chamber, in a known manner, fuel is pumped to the injection locations via a distributor groove in the pump piston and via pressure conduits provided in the distributor body in a number corresponding to the number of engine cylinders.

Fuel injection pump for internal combustion engines

A fuel injection pump for internal combustion engines, in which both a shift of the injection onset to early during cold starting or when the engine is not yet up to operating temperature can quickly become operative, and a fuel injection quantity adaptation device is operative unaffected by the control criteria for the cold-starting shift to early. To this end, a work chamber of an injection adjuster is acted upon separately by the feed pressure of a fuel feed pump prevailing upstream of a temperature-dependently unlockable pressure maintenance valve, and the pressure-controlled interior of a fuel injection pump supplying the adaptation device is connected to the outlet side of the pressure maintenance valve.

The control magnet is secured with cap screws on a cap of a control mechanism of an injection pump by means of a holder element, which is a two-armed leaf spring having pre-stressing. The leaf spring has a middle section which comes to rest flush on the magnet core and both arms come to rest flush on a support face of the cap. The spring force spring stressing of the two-armed leaf spring pre-stressed in this manner has an effect of keeping the control magnet secured such that it is not jarred loose even in the event of high acceleration peaks of the injection pump.

Device for securing control magnets on injection pumps for diesel fuel

Electrical plug and socket connection

A fuel injection pump for internal combustion engines is disclosed, in which a profiled governor rod of a supply quantity adjusting member, the latter controlled by a final control element, is extended at its end toward the final control element out of the pump housing and is supported in a displaceable manner at the point where it emerges. For the sake of sealing the support point, a cylindrical slide bearing sheath is secured in the pump housing at the location where the governor rod emerges from the pump housing. A cylindrical governor rod guide means which is joined to the profiled governor rod and closes it off or surrounds it in a sealing manner is guided displaceably, with the least possible play, in the slide bearing sheath.

A displacement pickup for detecting positions of an adjusting device, in particular an adjusting device of fuel injection pumps. In an advantageous manner, an adjustment of the displacement pickup can be performed with the aid of a cylindrical tang, which is displaceable and fixable in a through bore in the wall of a housing receiving the adjusting device and through the interior of which an adjusting device of the displacement pickup can be adjusted from outside the housing. In a displacement pickup advantageously embodied as a rotary potentiometer, a contact means of a resistor (R.sub.a) of the resistance course of the potentiometer can thus be adjusted.

Displacement transducer for detecting the position of an adjusting device

A valve is disclosed for gaseous and/or liquid flow media, in particular a pressure control valve for an exhaust recirculation valve in injection systems in motor vehicles. For the sake of attaining an extremely small opening hysteresis, this valve has a leakage point which is effective between the contact faces of the valve closing member and the valve seat. The suction flow brought about by the leakage point generates a film of flow medium between the contact faces which prevents the complete closure of the valve at a static point on the characteristic valve curve.

Valve for gaseous and/or liquid flow media

There is proposed a control apparatus (FIG. 1), which in order to prevent the emission of smoke upon acceleration of the engine, controls a damping stroke (h.sub.D) preceding the adjusting stroke (h.sub.L) which is controlled in accordance with charge pressure. The apparatus has a pressure chamber defined by a movable wall and connected via charge air line to the air inlet tube of the engine, and the movable wall actuates an adjusting member which varies the adjusting range or the full-load position of a supply quantity adjusting member of a fuel injection pump. A throttle device embodied as a sequence valve is inserted into a line connecting portion connecting the charge air line with the pressure chamber, and the stroke/time characteristic of the throttle device determines the damping stroke (h.sub.D). The apparatus may be mounted either on the rpm governor or on the injection pump of Diesel motor vehicle engines.

Charge-pressure-dependent control apparatus for supercharged

A control apparatus for a fuel injection pump of a diesel combustion engine is proposed, in which the fuel delivery adjustment element of the injection pump is moved to its zero adjustment position when the engine cuts off, is held in this position (roll-start lock), and can reach its start-position only in accordance with standard starting procedure. The control apparatus includes a hydraulically actuated correcting element, that can be placed under fuel delivery pump pressure by means of a directional control valve for displacing the fuel delivery adjustment element into its zero adjustment position. The correcting element is locked by a slide lock, likewise controlled by delivery pump pressure. The slide lock is brought into its blocking position when the delivery pump pressure drops sufficiently, and retracted only when the driver actuates the directional control valve and the delivery pump pressure increases when the engine starts.

Control apparatus for a fuel injection pump for diesel combustion engines

A centrifugal rpm governor for internal combustion engines is proposed, the flyweights of which are so embodied as to attain both inexpensive mass production thereof and favorable distribution of physical mass. The mass of the flyweight supported on a flyweight carrier is preferably manufactured of sintered steel and one of each are firmly screwed on a lever arm of a bell crank manufactured of sheet steel. These lever arms are embodied as angle brackets which are open toward the flyweight carrier, the mutually parallel arms of which bracket laterally enclose the flange of the flyweight carrier. A crosspiece which connects the two parallel arms has an end face oriented away from the bearing bores of the bell crank and disposed, in the resting position of the flyweight, at least approximately perpendicularly to the longitudinal axis of the rpm governor and against which end face the flyweight mass is firmly screwed by means of securing screws stressed up to the yielding-stress threshold.

Centrifugal rpm governor for internal combustion engines

A centrifugal regulator for an internal combustion engine having a fuel injector controllable by actuation of a control rod. Movement of the governor sleeve upon a variation in rpm is transferred to a spring-biased support lever, which is pivotally connected to a guide lever by a fixed pivot thereof, which guide lever is pivotally connected to an intermediate lever by a fixed pivot thereof, which lever is provided with a pivot axis and a link connecting it with the control rod. Various types of relationship between fuel injection rate and rpm are obtained by means of several differently placed adjustable or resilient stops provided on the spring-urged support lever and in the regulator housing. These stops come into play in a multi-stage serial relationship, allowing the support lever and the intermediate lever to severally pivot and rotate, thus transferring governor sleeve movement to the intermediate lever and the control rod.

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Weissach, Germany

Peter Knorreck