Patent application number | Description | Published |
20080265716 | PIEZOELECTRIC ACTUATOR WITH A SHEATH, FOR DISPOSITION IN A PIEZOELECTRIC INJECTOR - A piezoelectric actuator with piezoelectric elements, fastened between an actuator head and an actuator foot, and with a plastic sleeve surrounding at least the piezoelectric elements is proposed, which is set in a clamping ring on the actuator head and/or the actuator foot of the piezoelectric actuator. The respective clamping ring may be a metal part or a plastic part, which is equipped with clamping lugs suitable for setting the plastic sleeve and is thrust, pressed, or shrunk onto the respective actuator head and/or actuator foot of the steel piezoelectric actuator. | 10-30-2008 |
20080309197 | Piezoelectric Actuator Having a Self-Centering Plug-In Connection - The invention relates to a piezoelectric actuator used as a piezoelectric injector, comprising a holding body provided with an inner region, an upper part and a lower part, and a piezoelectric element which is arranged in the inner region against the upper part of the holding body and includes a plurality of piezoelectric layers arranged in the form of a stack, The piezoelectric element can be electrically contacted through the holding body. The upper part of the holding body has at least one connection for electrically contacting the piezoelectric element, and at least one connection and flow channels for feeding the inner chamber with a fluid that can be metered by means of a regulating element containing the piezoelectric element. An electrical plug-in connection is arranged between the piezoelectric element and the upper part of the holding body, which includes a mechanical plug-in connection being arranged between the holding body upper part and the piezoelectric element. | 12-18-2008 |
20090050114 | Injector - The invention relates to an injector for the fuel supply of an internal combustion engine, in particular in a motor vehicle. The injector has a piezoactuator for activating and/or actuating at least one nozzle needle to control the injection of fuel under high pressure through at least one nozzle spray hole. The piezoactuator is arranged with its shaft disposed in an actuator chamber of an injector body, and a high-pressure path directing the fuel under high pressure to at least one nozzle spray hole passes through the actuator chamber. In the injector according to the invention, the piezoactuator has an actuator foot at an end remote from the nozzle needle. The actuator foot has a sealing contour facing the nozzle needle and fitting in a sealing seat formed on the injector body remote from the nozzle needle. | 02-26-2009 |
20090200897 | PIEZOELECTRIC ACTUATOR MODULE HAVING A SHEATH, AND A METHOD FOR ITS PRODUCTION - A piezoelectric actuator module having a multilayer structure of piezoelectric elements is proposed as a piezoelectric actuator, wherein a different polarity of an electric voltage is alternately applied to inner electrodes which are arranged between piezoelectric layers of the piezoelectric elements in the direction of the layer structure of the piezoelectric elements, said module having an actuator foot and an actuator head composed of steel and having an elastic insulation medium which surrounds at least the piezoelectric elements in predefined limits. At least one annular groove or recess, into which a material which can be crosslinked with the insulation medium is vulcanized, is provided on the actuator foot and/or on the actuator head, and a flexible, weldable hose or sheath lies encompasses the piezoelectric element, and at least above the grooves or recesses containing the material as an insulation medium the weldable hose is welded to the material in the grooves or recesses. | 08-13-2009 |
20090206700 | Piezo actuator with a plug connection - A piezo actuator in the form of a piezo injector, includes a holding body having an inner space, and having a piezo element disposed in an inner space and encompassing multiple piezoelectric plies disposed to form a stack, which element is electrically contactable through the holding body. The holding body has one or more connectors for electrical contacting of the piezo element, as well as one or more connectors and flow conduits for delivering into the inner space a fluid that can be metered by way of an adjusting member encompassing the piezo element, such that in the piezo actuator, the flow conduit connecting the inner space and the connector for the fluid is offset radially outward with respect to the electrical conductors leading through the holding body and substantially constituting the electrical contact system, and is disposed to extend substantially parallel to said conductors; and a plug connection connecting the piezo element to the electrical conductors is disposed between the holding body and piezo element. | 08-20-2009 |
20100163650 | ACTUATOR MODULE WITH A SHEATHED PIEZOELECTRIC ACTUATOR - An actuator module including a piezoactuator, for example for a piezoinjector for metering fuel in an internal combustion engine, is proposed. The piezoactuator has piezoelements stacked one above another between an actuator head and an actuator foot and is provided with at least one elastomer layer enclosing the piezoelements. The elastomer layer is enveloped by a corrugated bellows or by telescopic tubes, composed of a material that is diffusion-impermeable with respect to a fuel to be metered by the piezoinjector. The corrugated bellows or the telescopic tubes have on their periphery grooves which can absorb expansions of the elastomer layer or of the piezoactuator. | 07-01-2010 |
20120181358 | COIL CONTACT - The invention relates to a magnetic assembly ( | 07-19-2012 |