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Piezo-electrical actuator module and fuel injection valve

A piezoelectric actuator, fuel injection valve technology, applied in fuel injection devices, piezoelectric/electrostrictive/magnetostrictive devices, circuits, etc., can solve problems such as affecting the life of electrical contacts, and achieve improved structure and layout. , the effect of reliable electrical contact

Active Publication Date: 2013-07-31
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Problematic here, however, is the positioning of the piezo actuator relative to the actuator foot, since due to the relative movement loads on the copper wires occur which affect the life of the electrical contacts

Method used

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  • Piezo-electrical actuator module and fuel injection valve
  • Piezo-electrical actuator module and fuel injection valve

Examples

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Embodiment Construction

[0013] FIG. 1 shows a schematic diagram of a fuel injector 1 with a piezoelectric actuator module 2 according to an exemplary embodiment of the invention. The fuel injector 1 can be used in particular as an injector for an air-compressing, self-igniting internal combustion engine. The piezoelectric actuator module 2 is particularly suitable for such a fuel injector 1 . However, the fuel injector 1 according to the invention and the piezoelectric actuator module 2 according to the invention are also suitable for other applications.

[0014] The piezo actuator module 2 has an actuator body 3 and an adapter piece 4 . In this exemplary embodiment, the adapter part 4 is designed as an actuator foot 4 . The actuator foot 4 has a base body 5 made of metallic material, in particular stainless steel. The actuator foot 4 also has an injection-molded coating 6 made of plastic, which forms a collar 6 for the actuator body 3 . The injection-molded coating 6 is here sprayed onto the bas...

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Abstract

The invention relates to a piezo-electrical actuator module (2) in particular for fuel injection valves of fuel injection systems for internal combustion engines, comprising an actuator body (3) and at least one transition piece (4). The transition piece (4) has a contact surface (25). According to the invention, the actuator body (3) contacts the contact surface (25) of the transition piece (4) with an end face (26) on one end (28) of the actuator body (3). The transition piece (4) has a frame (6) which surrounds the contact surface (25). The frame (6) positions the actuator body (3) at the end (28) thereof on all sides on the contact surface (25). A reliable electrical contacting of outside electrodes (16) of the actuator body (3) is thus possible, since a relative movement between the actuator body (3) and the transition piece (4) is prevented. The invention additionally relates to a fuel injection valve (1) having such a piezo-electrical actuator module (2).

Description

technical field [0001] The invention relates to a piezoelectric actuator module and a fuel injection valve. The invention relates in particular to the field of injectors for fuel injection systems of air-compressed, self-igniting internal combustion engines. Background technique [0002] When designing the piezoelectric actuator module, it is conceivable to realize the electrical contacting of the piezoelectric actuators of the actuator module via plastic-coated copper wires which are guided through the steel part serving as the actuator foot. In this case, the sealing can be ensured to the outside by a suitable sealing sleeve. Problematic here, however, is the positioning of the piezo actuator relative to the actuator foot, since due to the relative movement loads on the copper wires occur which affect the life of the electrical contacts. In extreme cases, the copper wires can be disconnected from the external electrodes. Contents of the invention [0003] The piezo ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M51/06F02M61/16F02M63/00H01L41/053H10N30/88
CPCF02M51/005F02M51/0603H01L41/053F02M63/0026F02M61/168H10N30/88
Inventor M.科普夫
Owner ROBERT BOSCH GMBH
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