Daimler-benz Ag

Other

Daimler Chrysler Ag

Mercedes-benz Aktiengesellschaft

P&s Prolotypen Und Sondermaschinen Gmbh

Karl-Heinz Hoffmann

Gregor Renner

Jens-Peter Wobbe

Friedrich Wirbeleit

Frank Thoma

Paul Schwerdt

Claus Stenger

Gerd Huber

Reinhard Fischer

Christoph Burckhardt

Heinz Oeing

Manfred Müller

Bernd Wiemann

Gerd Blessing

Guenter Vogt

Swen Fleisch

In a piston pump for providing high-pressure fuel in a common-rail fuel injection system including a camshaft (), which is mounted rotatably in a pump housing () and which has at least one eccentric cam) for operating a pump piston () in an approximately radial direction with respect to the camshaft (), in order to reduce the wear of the piston pump, a piston-rod element () is arranged between each pump piston () and the eccentric cam () so as to transmit the stroke movement () and the force from the eccentric cam of the camshaft () to the pump piston () by a rolling movement.

Radial piston pump with piston rod elements in rolling contact with the pump pistons

An injector for a fuel injection system is provided with an injector housing in which a piezoelectric stack is located and with a valve housing connected with the injector housing in which a valve closing device with a jet needle is displaceably located. The valve closing device can be actuated by the piezoelectric stack. The valve closing device can be reset by a return device. A hydraulic following amplifier is located between the piezoelectric stack and the jet needle of the valve closing device. The amplifier has a displacement piston actuated by the piezoelectric stack. A control piston located downstream from the displacement piston and increases the displacement travel. A working piston that actuates the jet needle and increases the actuating force.

Injector for fuel injector systems

In a valve for the dosed discharge of fluids particularly a fuel injection valve for fuel injection systems of internal combustion engines, the valve includes in an valve housing at the front end of an injector housing a valve structure at a fluid discharge end of the valve housing and a stack of piezo elements disposed in the opposite end of the injector housing and a high pressure fluid passages leads to the fluid discharge end which is isolated from the area in which the stack of piezo elements is disposed and which is in communication with a low pressure drain passage such that the piezo elements are not exposed to the high pressure fluid. Isolation is obtained by a compensation cylinder movably disposed in an annular space between, and in sealing relationship with, the valve housing, the piezo stack being enclosed in a piezo guide tube which is sealingly connected to the valve housing.

Valve for the dosed discharge of fluids

In a piezo-control valve for fuel injection systems of internal combustion engines wherein a piezo-ceramic actuating rod is mounted with one end firmly to one end of a valve housing having a nozzle body with a valve seat disposed at the other end and a nozzle control needle is disposed in the nozzle body and pressed by the piezo-ceramic actuating rod onto the valve seat in the nozzle body when the piezo-ceramic actuating rod is not activated, the valve housing includes a sleeve-like portion disposed around the piezo-ceramic actuating rod which consists of a material compensating for temperature-caused changes in the length of the piezo-ceramic actuating rod.

Piezo-control valve for fuel injection systems of internal combustion

A hydraulic injection-adjusting device for high pressure injection installations in auto-igniting internal combustion engines. Oil is supplied to operating chambers of the injection-adjusting device by means of a pressure supply pump with an electrically actuatable regulating valve being provided for controlling the flow of oil to inlet of the operating chambers. An electronic control unit is supplied on an input side which signals corresponding to current engine operating parameters with the control unit yielding on an output side thereof a desired value for the regulating valve to apply pressure in a controlled fashion to the injection-adjusting device. An arrangement is provided for measuring the actual value of the adjustment angle at the injection-adjusting device by constant answer-back line provides a feed of the actual value to the control unit. A control unit, depending on whether the desired value is larger with respect to the actual value or whether the actual value is larger than the desired value, yields a first and second signal of a defined magnitude. A regulating valve is constructed as an electromagnetically operated three-way or three-position valve for regulation of pressure supply, and pressure relief, with the regulating valve being capable of providing a control function when the valve is in a closed position.

Hydraulic injection-adjusting device for high pressure injection

Growing community of inventors

Stuttgart, Germany

Karl-Heinz Hoffmann