Robert Boschgmbh

Josef Guentert

Uwe Kuhn

Juergen Hammer

Johann Warga

Siegfried Ruthardt

Bernd Streicher

Hans-Juergen Simon

Manfred Kraemer

Kasim-Melih Hamutcu

Jan Grebe

Gerd Loesch

Karsten Hummel

Armin Merz

Manfred Wilhelm

Christian Langenbach

Antonio Diaferia

Thomas Schwarz

Peter Grabert

Wolfgang Eckell

Hansjoerg Frey

Thomas Lettner

Sandra Ranaldo

Robert Reitsam

Nicola Cimaglia

Dieter Heck

Klaus Wuerth

Karl-Heinz Linek

Paul Wuetherich

Manfred Fink

Rosanna Iorizzo

Hans Brett

Walter Haefele

Juergen Fritsch

Guido Kampa

Axel Paetz

Karel Kolar

Manfred Ziehl

Ralf Haegele

Florian Kleer

Giuseppe Palma

A fuel pump according to the invention includes a housing and a part, which is a moving part during operation and which bears on a housing region at least indirectly. It is proposed that the fuel pump includes a coating which is applied to the housing region on a side of the housing region which faces towards the moving part, and that the coating is composed of a plastic.

Fuel pump, in particular for a fuel system of a piston engine

A radial piston pump has a pump housing containing pump elements and whose high-pressure conduits extending in the pump housing are embodied so as to significantly increase the permissible operating pressures.

Radial piston pump for fuel injection system having improved high-pressure resistance

A high-pressure piston pump with a plurality of pump elements is connected on the intake side to a pump that pumps fuel at low pressure in a regulated quantity. Each pump element is preceded on the intake side by a first and a second check valve in series. The first check valve opens counter to spring force in the intake phase of the pump element and closes in the pumping phase. The second check valve opens counter to spring force and closes, reinforced by spring force, at pressures of the fuel supplied by the pump that are higher than the negative pressure generated in a cylinder chamber of the pump element. The second check valve takes on the metering of the fuel supplied to the pump element; the first check valve blocks off the cylinder chamber counter to the check valve in the pumping phase, whereby the piston pump serves to supply fuel at high pressure in fuel injection systems of internal combustion engines, especially in a common rail injection system.

Piston pump for high-pressure fuel generation

The invention relates to a radial piston pump for high-pressure fuel supply in fuel injection systems of internal combustion engines, in particular in a common rail injection system. The piston pump has a drive shaft which is eccentrically supported in a pump housing and on which a ring is slidingly supported. The ring cooperates with a plurality of pistons, disposed radially relative to the drive shaft in a respective cylinder chamber. The pistons are movable radially back and forth in the respective cylinder chamber by rotation of the drive shaft. To increase the efficiency of the engine, the cylinder chambers are filled with less fuel when demand drops. In this so-called partial element filling, in which a plate is retained in contact with a polygonal ring, increased wear and damage are prevented. The wear is brought about by a guide device which prevents rotation of the ring about its own axis.

Radial piston pump for high pressure fuel supply

The invention relates to a radial piston pump with a drive shaft supported in a pump housing and preferably with a number of pistons, each in its own cylinder chamber, arranged radially with regard to the drive shaft, and with a plate attached to the ends of these cylinders oriented toward the drive shaft, which plate has a blind hole in its center for receiving the end of the associated piston, wherein on its circumference, the piston has a groove into which a snap ring is inserted in order to fasten a plate retainer to the piston, which holds the plate on the piston, which is characterized in that at the rim of the blind hole in the plate, a cylindrical recess is produced, wherein the diameter of the cylindrical recess is dimensioned so that the play between the snap ring and the circumference of the cylindrical recess is smaller than the depth of the groove.

Radial piston pump for producing high fuel pressure internal combustion engines

A common rail system for internal combustion engines, having a high-pressure pump mounted on a part of the engine, especially on an engine block, control gear or reduction gear. For thermal decoupling purposes, the contact areas between the part of the engine and the high-pressure pump are minimized.

Common rail system for internal combustion engines

A radial piston pump for generating high fuel pressure in fuel injection systems of internal combustion engines, having a drive shaft which is supported in a pump housing. The drive shaft is embodied eccentrically or has camlike protrusions in the circumferential direction. A plurality of pistons are disposed radially with respect to the drive shaft in a respective cylinder chamber. A plate is mounted on the ends of each piston toward the drive shaft, and the pistons are movable back and forth radially in the respective cylinder chamber by rotation of the drive shaft. Wear problems are solved by providing that the plate is pivotably connected to the associated piston. By the deflection of the plate on the piston, the load on the piston from moments of the bracing force is lessened.

Radial piston pump for producing high pressure fuel

The invention relates to a radial piston pump for high-pressure fuel delivery in fuel injection systems of internal combustion engines in a common rail injection system having a drive shaft that is supported in a pump housing. The drive shaft is eccentrically embodied or has a number of cam-like projections in the circumference direction, and a number of pistons are arranged radially in relation to the drive shaft. Each piston reciprocates a respective cylinder chamber and is moved in a reciprocating fashion in the cylinder chamber when the drive shaft rotates. A spring-preloaded check valve is assembled on the intake side and on the high pressure side, and a component that includes a through opening constitutes the respective cylinder chamber. A high-pressure delivery opening leads away from the cylinder chamber and in the sealing seat of the high pressure side check valve, opens out into a mounting opening of the component. The mounting opening contains the valve components. In order to achieve a simplified assembly in a vicinity of the high pressure side check valve, with the exception of a valve body which is placed against the sealing seat, the high pressure side check valve is inserted into the mounting opening as a preassembled unit and is tightened against the component to form a high-pressure seal.

Radial piston pump for high pressure fuel delivery

The invention relates to a radial piston pump for high-pressure fuel delivery in fuel injection systems of internal combustion engines, in particular in a common rail injection system, having a housing, a drive shaft that is supported in the pump housing and has an eccentrically embodied shaft segment. A ring is slidingly supported on the shaft segment and cooperates with a plurality of pistons. The pistons are disposed radially with respect to the drive shaft in a respective cylinder chamber. Ends of the pistons oriented toward the drive shaft each have a respective plate. To improve engine efficiency, the cylinder chambers are filled with less fuel as the demand drops, this prevents increased wear and damage from occurring during operation. The problem of wear and damage is solved in that all the plates are kept in contact with the ring by a leaf-spring-like device, in particular a single clamp. In a radial piston pump in which a plate is held by a plate holder, the plate holder is secured to the ring.

Radial piston pump for high-pressure fuel delivery

A radial piston pump for a high-pressure fuel supply in fuel injection systems of internal combustion engines includes a drive shaft, supported in a pump housing, and a plurality of pistons disposed radially with respect to the drive shaft in respective cylinder chambers. The pistons are movable back and forth in the radial direction, and for each piston, one metal insert part forming the respective cylinder chamber is provided inside the housing and radially to the drive shaft to communicate with the intake side and with the high-pressure side. The respective insert part in the direction of the drive shaft between two flangelike metal housing parts with bearing faces extend perpendicular to the drive shaft and rests on these faces. The respective insert part has a fuel delivery opening and a fuel discharge opening, which discharges in the region of the bearing faces and are aligned with a further respective delivery and discharge opening in the housing parts. The flangelike housing parts are tightened against one another, with the interposition of the insert parts, in such a way that the bearing faces of the respective insert part and housing parts effect high-pressure sealing with the interposition of sealing elements.

Radial piston pump for high-pressure fuel supply

The invention relates to a radial piston pump for high-pressure fuel delivery in fuel injection systems of internal combustion engines. The pump includes a drive shaft that is supported in a pump housing and is embodied eccentrically or has a number of cam-like projections in the circumference direction, with a number of pistons that are disposed radially with regard to the drive shaft, each piston in a respective cylinder chamber. Each piston can be set into a reciprocating motion in the cylinder chamber upon rotation of the drive shaft. The pump includes an intake side and a high-pressure side check valve, and a component which has a through opening that constitutes the cylinder chamber, into whose radially outer end, a sealing element is inserted. The intake side check valve is integrated into the sealing element. In order to more compactly embody the piston pump, the sealing element is sealed in a pressure-tight fashion toward the outside in the longitudinal direction of the through opening that constitutes the cylinder chamber, and the fuel supply to the intake side check valve takes place by way of a fuel supply opening that is disposed in the component and is essentially radial to the longitudinal direction.

A high-pressure pump for supplying fuel in a fuel injection system of an internal combustion engine, including a common rail injector system. The fuel injection system includes a low-pressure part that contains a fuel tank and a prefeed pump and a high-pressure part that contains a high-pressure pump and a common rail into which a fuel flow is fed from the high-pressure pump through a common conduit. The high-pressure pump system solves a problem in that there is an integrated demand-based quantity control for the fuel flow pumped by the high-pressure pump. The demand-based quantity control integrated with the high-pressure pump contributes to improving the overall engine efficiency, because the power consumption by the high-pressure pump drops as a result.

High pressure pump for supplying fuel in fuel injection system of internal combustion engines

Pump device for high pressure fuel delivery in fuel injection system of

A fuel injection apparatus for internal combustion engines, having a fuel injection pump inserted into the housing of the engine. A pump piston, which is driven axially back and forth in a cylinder bore, with one end face defines a pump work chamber from which a short injection line leads to an injection valve, and which can be made to communicate via a feed line with a fuel-filled low-pressure chamber. A magnetic valve disposed on the fuel injection pump controls the high-pressure feeding into the injection line. In order to avert an overly rapid return flow of fluid from the injection line into the pump work chamber, a return flow throttle valve is inserted into the injection line.

Fuel injection apparatus 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).

Growing community of inventors

Gerlingen, Germany

Josef Guentert