Robert Boschgmbh

Karsten Hummel

Karl Rapp

Hansjoerg Frey

Ernst Ritter

Werner Faupel

Johannes Locher

Josef Guentert

Sieghart Maier

Rolf Mueller

Helmut Knoedl

Martin Boehm

Hans-Joachim Peters

Siegfried Ruthhardt

Karel Kolar

Axel Paetz

Guido Kampa

Alexander Tyrolt

A fuel injection pump for internal combustion engines in which to control the fuel injection quantities with the internal combustion engine cold, a first control edge is provided. For controlling the start of fuel injection with the internal combustion engine hot, a second control edge and a third control edge are provided. Assigned to respective control edges are provided a first and second oblique control edge, by means of which an effective pump piston feed stroke is controlled according to the rotary position of the pump piston. To switch off the internal combustion engine, in the region of transition from the first control edge to the second control edge the assignment of this second control edge to the second oblique control edge is provided in such a way that injection ceases on account of an overlap with a control port. This measure is assisted by an additional longitudinal groove which, in this rotary position, is in overlap with an additional control port, this additional longitudinal groove being the extension of a longitudinal groove, via which a pump working space is relieved during the operation of the internal combustion engine and after a reopening of the control ports by the oblique control edges.

Fuel-injection pump for internal-combustion engines

A fuel-injection pump for internal combustion engines, particularly an in-line injection pump for diesel engine, with a control bore in the pump cylinder and with an upper control edge for determining the start of feed and an oblique spill edge for determining the end of feed. The pump piston is rotated about its longitudinal axis in order to set the desired feed quantity, for the purpose of achieving a better regulating behavior of the system as a whole, comprising the fuel-injection pump, feed-quantity regulator and internal-combustion engine. The spill edge is subdivided, along its run over a part of the circumference of the pump piston, into portions with different angles of inclination (.alpha..sub.1, .alpha..sub.2) to the axis of the pump piston. The control-edge portion having the large angle of inclination (.alpha..sub.2) is located in the region of the pump piston which passes over the control bore during the pump-piston stroke in a rotary position of the pump piston for small feed quantities (lowered load range of the internal-combustion).

Fuel-injection pump for internal combustion engines

A fuel injection pump for internal combustion engines, having a pump piston that is axially guided in a cylinder bushing which defines a pump work chamber there and is moved axially by a cam drive counter to the force of a restoring spring. The cam drive comprises a roller tappet connected to the pump piston whose roller rolls off on a cam of a camshaft driven by the internal combustion engine to be supplied. In the process, the roller is connected to the cylindrical part of the roller tappet by means of a roller pin disposed vertically to the axis of the roller tappet. This roller pin is axially secured by means of the contact of its axial ends to the wall of a bore that guides the roller tappet, for which purpose the transition area between the face ends, which extend vertically to the axis of the roller pin, and the circumferential area of the roller pin is part of a circular ring. The radius of the circular ring cross-section is adapted to the diameter of the wall of the roller tappet guide.

Fuel injection pump for internal combustion engines

A fuel injection pump for internal combustion engines having in-line cylinder bushes, in each of which a pump piston defining a pump work chamber is guided, the piston being rotatable by a governor rod for the sake of fuel supply quantity regulation. Mounted on the pump housing is an adjusting device, in which an adjusting piston is guided axially parallel with the governor rod; the adjusting piston has a radial pin, which protrudes through a slit in the wall of the adjusting device and pump housing into an oblong slot of the governor rod, thus limiting the adjusting motion of the rod in certain operating ranges. The position of the adjusting piston determines the maximum governing travel of the governor rod in the full-load direction upon engine starting. The adjusting piston is variable via an adjustable stop acting upon one face end thereof and is also variable as a function of temperature via a temperature-dependent spring element disposed on its circumference. In addition, with its face end, the adjusting piston defines a pressure chamber, by way of which the adjusting piston can be adjusted pneumatically in the direction of a zero supply quantity; via two stops of the oblong slot, the adjusting piston moves the control rod with it in the process and in this way interrupts the fuel delivery.

A speed governor for fuel injection pumps of internal combustion engines in which part of an oscillation damper member, in the form of a capsule, is disposed between a drive shaft and a flyweight adjuster; two claws of a support that receives the flyweights of the centrifugal adjuster and two claws of a coupling element connected to the drive shaft. The two claws are connected to one another by way of a segmented type buffer element, all of which protrude into the capsule. The claws of the coupling element protrude into the open part of the capsule, while the claws of the support protrude into the capsule through openings in the capsule bottom. For the sake of greater strength of the capsule, the openings are embodied in closed form according to the invention.

Speed governor for fuel injection pumps of internal combustion engines

A speed governor for fuel injection pumps of internal combustion engines that has a centrifugal adjuster that acts counter to the force of governor springs to generate a speed-dependent adjustment travel of a governor sleeve and that acts on a fuel quantity adjusting device of a fuel injection pump via the governor sleeve and a governor lever disposed thereupon In this process a charge-pressure-dependently adjustable stop for a full-load fuel supply quantity, which is disposed on a stop lever is pivoted as a function of temperature and speed into the adjustment path of a counter stop disposed on the fuel quantity adjusting device, in such a way that, after a certain speed and a certain operating temperature of the engine has been reached, the stop comes into contact with this counter stop of the fuel quantity adjusting device. For this purpose the stop lever has two lever arms, and a temperature-dependently controlled governor member which acts on the first lever arm, and a speed-dependently-controlled control lever which acts in the same direction of rotation on the second lever arm.

Speed governor for fuel injection pumps

A fuel injection pump for internal combustion engines with a plurality of pump elements in which the fuel injection quantity is varied via a governor rod, which is supported in a U-shaped guide rail; according to the invention, this guide rail is loaded in its middle region by at least one spring element, in order to prevent transverse vibration of the governor rod.

A control device including a reversing valve, disposed in fuel lines into which a feed pump is introduced between a fuel supply tank and a suction chamber of a fuel injection pump, by means of which valve, to turn off an internal combustion engine operated with the fuel injection pump, the line connections are variable in such a way that the suction chamber communicates with the intake side of the feed pump and the compression side of the feed pump communicates with the fuel supply tank. As its valve member, the reversing valve has a slide, which carries first and second double-seat-valve closing bodies that cooperate with corresponding valve seats. The first and second double-seat-valve closing bodies form sealing elements which are detachably buttoned onto the slide that are made of an elastically deformable material. The sealing elements are provided with elastically deformable sealing lips pointing to the valve seats, so that oppositely disposed valve seats of each seat are reliably sealed off even if there are dimensional variations from manufacturing tolerances.

Control device for turning off an internal combustion engine

An injection pump with a full-load stop, preferably electronically controlled, which is adjustable against the force of a prestressed spring as a result of the control exerted by an electromagnet with a controllable stroke and which, when there is no current in the magnet, is displaceable by means of the spring into its terminal position which determines a reduced full-load quantity. Thus the maximum injection quantity is reduced in accordance with operating conditions and with the operational status of the engine; by this means, environmentally safer and smoother engine operation is possible at all operating conditions. The injection pump is also capable of continuing to function if the electrical or electronic parts fail.

Growing community of inventors

Beilstein-Schmidhausen, Germany

Karsten Hummel