Continental Automotive Gmbh

Siemens Aktiengesellschaft

Jürgen Dick

Martin Simmet

Willibald Schürz

Hellmut Freudenberg

Heinz Lixl

Richard Pirkl

Christoph Hamann

Maximilian H Kronberger

Marcus Unruh

Wolfgang Wechler

Wolfgang Bloching

Johann Massinger

A tubular spring is provided for receiving and pretensioning a piezoelectric or magnetostrictive actuator of an actuator unit, e.g., for actuating a fuel injector valve in internal combustion engines, wherein the tubular spring comprises at least two types of recesses, each comprising different maximum lateral extensions in the longitudinal direction of the tubular spring. The tubular spring is designed to comprise a uniform load distribution about the circumference of the tubular spring even without welding the longitudinal sides thereof abutting one another.

Tubular spring for receiving and pretensioning an actuator

A drive device for an injection valve may include an actuator configured for exerting a force along a first force action axis, a lever device coupled to the actuator, an output element coupled to the lever device and configured for absorbing a force from the lever device along a second force action axis, wherein the first and second force action axes are arranged offset with respect to one another, and a transmission element arranged between the actuator and the lever device. The transmission element may be coupled to the actuator in a first contact region and to the lever device in a second contact region. The first contact region of the transmission element may be arranged such that it is penetrated by the first force action axis. The second contact region of the transmission element may be arranged such that it is penetrated by the second force action axis.

Drive device for an injection valve, and injection valve

In an actuator unit for an injection system of an internal combustion engine, the difference in the longitudinal extension when a change of temperature of the piezoelectric actuator element occurs affecting the actuator unit is equalized compared to the actuator housing due to different thermal expansion coefficient values in that a fastening element is arranged on the actuator housing. The fastening element is made of a different material than the actuator housing and thus affects a force acting counter to the change of length of the actuator housing.

Actuator unit for an injection system of an internal combustion engine

An injector, especially for an accumulator injection device, comprises an inlet connection (), a leakage connection () and an electric connection (). The leakage connection () and the electric connection () are embodied as a single-piece injection component (), wherein the component is directly injection-moulded onto the injector ().

Injector with improved connection geometry

An injection module comprises a housing (), inside of which an actuator element () and an injection valve are arranged. The actuator element () is designed for controlling the injection valve by a setting stroke. A compensating element () is provided that is connected to the actuator element () in order to compensate for the change in length of the housing () caused by thermal expansion.

Injection module

The invention relates to a method and an injector for determining a position of a second part () inside a stepped boring (). This part should assume an exact distance (H) from a first part (). In order to determine the distance (H) between both parts (), a collar () is firstly introduced into a second boring () of the stepped boring () until it rests upon a step () of the stepped boring (). Afterwards, a punch (), together with a touch probe (), which is located inside a longitudinal boring (d), is placed upon a lower annular surface () of the collar () or on an underside () of the first part (), and the collar () is compressed until the predetermined distance (H) is obtained. The distance (H) is measured to a reference measure (x) between a projecting end piece (E) of the touch probe () and a reference mark (B) outside of the punch (). The stamping process is stopped once the reference measure (x) has been obtained.

Method for determining the position of a component in a stepped bore of a housing, and an injector for fuel injection

In an actuator unit, the piezo actuator () is located inside a tubular spring () under pre-stress. To compensate the thermal length modifications of the piezo actuator () in relation to the actuator housing (), the compensation element is configured as an aluminium compensation cylinder () that is situated in an extension tube (). The piezo actuator () and the compensation cylinder () are mounted in series and conjointly pre-stressed by means of the tubular spring () that is extended in relation to the actuator housing by the extension tube ().

Piezo actuator comprising means for compensating thermal length modifications and fuel injection valve comprising a piezo actuator

An actuator () acts as a drive unit for an injector, especially for an accumulator injection system. The actuator comprises a piezostack () disposed in a tube spring, a top plate () and a bottom plate. The top plate () of the actuator is directly fixed to the injector housing () by means of caulked areas. The caulking enables the injector to be produced in a simple and economical manner.

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Laaber, Germany

Jürgen Dick