Robert Boschgmbh

Eberhard Hofmann

Heinrich Staudt

Reinhard Schwartz

Josef Guntert

Walter Hafele

Wolfgang Eckell

Max Straubel

Gerald Hofer

Helmut Laufer

Ernst Ritter

Francois Rossignol

Helmut Tschoeke

Helmut Pfeifle

Karl Reiff

Raymond Tissot

Karl Sontheimer

Hellmut Tomasch

Hartmut Lehmann

Alois Urlberger

Herbert Bechstein

Berthold Wagner

Herbert Biebl

Erwin Weyrich

Hans Stauch

Anton Franz

Theodor Winnewisser

A fuel injection pump for internal combustion engines which has at least one pumping element inserted in a reception bore of a pump housing made of light metal. The pumping element substantially comprises a cylinder sleeve, in the cylinder bore of which a pump piston is slidably guided, and a pressure valve. The pump piston has at least one oblique control edge and is rotatable in order to vary the supply quantity. The valve body of the pressure valve is disposed in an extension of the cylinder bore. The cylinder sleeve and the pressure valve are tightly fastened into the housing by means of a screw nipple. The screw nipple is threaded into a steel plate, which is tightly fastened against the upper end face of the pump housing by means of screws.

Fuel injection pump for internal combustion engines

A fuel injection pump for internal combustion engines having control slides that are both axially displaceable and rotatable on the pump piston via a governor rod for controlling the injection quantity and the injection onset. A slit hub is releasably clamped on the governor rod with a driver arm, the hub being arranged to engage the control slide between two working faces and the hub has a driver recess for the rotational adjustment of the control slide. The driver recess is engaged by a tang joined with the control slide.

The injection pump includes a pump cylinder, a pump piston moving into it and a hydraulic device for adjusting the instant of injection. The adjusting device has an adjusting cylinder, which is directed parallel to the pump cylinder and is accommodated in the housing of the injection pump, and adjusting piston and a restoring spring and adjusts a control sleeve, which opens the pump piston provided with at least one control recess in the longitudinal direction of the pump piston. This orientation and disposition of the adjusting cylinder effects a space-saving and inexpensive design of the injection pump and improves the precision of adjustment. The adjusting piston and the control sleeve may be directed coaxially and embodied as a single component, as a result of which a further space saving and increase in adjustment precision are attained.

Fuel injection pump having an adjustable instant of injection

A fuel injection apparatus for definite pilot and main injection in internal combustion engines. A hydraulic auxiliary pump is supplied via a pressure line with fuel from a high-pressure injection pump, which fuel reaches a main injection nozzle and simultaneously drives the hydraulic auxiliary pump. The hydraulic auxiliary pump contains a differential piston comprising a reservoir piston and a pilot injection piston with different diameters and with a spring prestressing such that between the end of supply of the pilot injection and the onset of supply of the main injection, an injection-free spacing stroke (DH) which can be predetermined by means of mechanical stops results, during which spacing stroke (DH) the reservoir piston by retracting further, receives the supply quantity which is pumped during the injection interval by the high-pressure injection pump.

Fuel injection apparatus for definite pilot injection and main injection

An apparatus is proposed for the open-loop control of the composition of the operating mixture to be introduced into the combustion chambers of an internal combustion engine. In this apparatus, the dispensing of the aspirated air quantity is effected by means of an aspirated air throttle device, whose displacement complementarily adjusts the cross section of an exhaust gas recirculation line which discharges into the intake system downstream from this throttle device. The opening of the aspirated air throttle device in order to increase the quantity of aspirated air is effected by means of a control pressure delivered to a servomotor, counter to the force of a restoring spring. The control pressure is obtained from the comparison of the actual quantity of aspirated air with the fuel injection quantity. The initial pressure for establishing the control pressure is the supply pressure of a supply pump supplying the fuel metering device. In order to prevent the throttle device for aspirated air from being moved into the closed position during starting of the engine, an additional adjusting device, also actuated by fuel supply pressure, is provided. When supply pressure is absent, this adjusting device moves the aspirated air throttle device into the opening direction counter to the restoring force. At the same time, the outlet opening of the exhaust recirculation line is closed as a result.

Control for operating mixture in internal combustion engines

An apparatus for setting the angular relationship between rotating driving, and driven members in the injection pump drive of an internal combustion engine. The driving member and the driven member have a toothed portion of which at least one is a helical toothed portion, whereby the toothed portions are coupled to each other by a coupler member having toothed portions which mesh with the toothed portions of the driving and driven members. At least one of the toothed portions of the coupler member is configured as a helical portion and is hydraulically displaceable with respect to the other toothed portions. This hydraulic displacement is controlled by a centrifugal governor having flyweights. The flyweights displace a valve member against the force of at least one spring in an rpm-dependent manner to effect the rpm-dependent adjustment of the instant of injection. In addition to the rpm-dependent displacement, a load-dependant displaceability, can be superimposed. As a result, the instant of injection can be influenced in accordance with load, in order thus to attain an improved combustion efficiency.

Apparatus for setting the angular relationship between rotating driving,

There is described a multicylinder fuel injection pump which is provided with a device that extends the length dimension thereof. The device includes a longitudinally shiftable piston disposed in a chamber that opens into the fuel injection pump. The shiftable piston includes perpendicularly disposed pin means arranged to cooperate with a fuel rack. In the rest position of the piston the regulating movements of the fuel rack caused by the governor are either unhindered because of the correspondingly long recess in the fuel rack, or limited to a predetermined travel path.

A lock assembly for restraining a drive shaft of a fuel injection pump in a definite rotary position that corresponds to the initial point of fuel injection for an internal combustion engine. The lock assembly which can be removed after installation of the pump in a motor vehicle includes an elastic deformable element that has a portion thereof that is rigidly connected adjacent to one end wall of the pump housing and further includes another portion that is secured to an element driven by the drive shaft.

Lock assembly for a drive shaft of a fuel injection pump for internal

A fuel injection pump for internal combustion engines including a cylinder bushing and a mounting flange fastened thereto. The mounting flange mounts the cylinder bushing to a pump housing and includes an adjustment tool engaging portion. This adjustment tool engaging portion extends transversely outwardly from the longitudinal axis of the cylinder bushing to a greater extent than does the location of the bolts which mount the flange to the pump housing. The cylinder bushing is received within the pump housing so that it can be rotated by the adjustment tool within a limited angular region for effecting a basic setting of the fuel quantity supplied by the pump.

A fuel injection pump for internal combustion engines includes a housing, which defines an elongated chamber, within which serial pumps including, in respective cylinders, pump pistons driven by a cam shaft via respective cams. The elongated chamber is closed by a single cover. A seal is provided between the cover and the housing by an O-ring tightened between an offset provided on the circumference of the cover and an inwardly facing wall of the housing. The offset provided on the circumference of the housing is so shaped, along its surface facing the inwardly facing wall of the housing that the O-ring is primarily stressed axially, with respect to the direction of fastening of the cover, along two sections which extend in the longitudinal direction of the cover and that the O-ring is primarily stressed radially in the region of the housing adjacent to end walls of the housing.

An apparatus for adjusting the delivery quantity on multi-cylinder fuel injection pumps including a drive unit and a clamping means for the injection pump in the form of an in-line pump. The pump pistons are provided with at least one control edge and are axially arranged and rotatably guided in cylinder barrels. Each piston is held in its fitting position, at least indirectly, by a flange. A mechanically activatable adjusting tool is mounted in the apparatus and operatively arranged to be driven via a control gear. The tool is force lockingly connected to an application point or engagement point on the securing flange of the injection pump or to a transmission element coupled to the securing flange or the cylinder barrel. A servo motor, preferably a stepping motor, is used to drive a control gear which effects movement of the tool.

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Kirchberg, Germany

Eberhard Hofmann