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Actuator arrangement for use in a fuel injector

A technology for actuator devices and fuel injectors, which is applied in the direction of fuel injection devices, special fuel injection devices, machines/engines, etc., to achieve the effect of avoiding poorly fixed interface

Inactive Publication Date: 2014-01-08
DELPHI INT OPERATIONS LUXEMBOURG S A R L
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, it has been observed that there is still an entry point for fluid into the interface between the actuator and the polymer sleeve

Method used

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  • Actuator arrangement for use in a fuel injector
  • Actuator arrangement for use in a fuel injector
  • Actuator arrangement for use in a fuel injector

Examples

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Embodiment Construction

[0048] As shown in the side view of FIG. 1 , the actuator device 10 includes a generally cylindrical body portion 12 comprising a central body portion housing the piezoelectric stack structure, and first and second end pieces 14, 16, respectively. . At a first end of the body portion 12, the end piece 14 includes an electrical connector 18 having a first terminal 20 and a second terminal 22 for receiving a voltage from a voltage source. At a second end of the body portion 12, an end piece 16 includes a load transfer member, commonly referred to as a ball joint, for cooperating with a control piston or valve needle (not shown) of the fuel injector.

[0049] Details of the piezoelectric stack structure and internal components of the actuator 10 and a description of how the actuator operates have been fully disclosed in the applicant's granted patent EP0995901 and will therefore not be discussed here.

[0050] From FIG. 1 it is apparent that there is an encapsulation member 24 w...

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Abstract

The invention discloses an actuator arrangement (10) for use in a fuel injector, comprising: a piezoelectric actuator having a body section (12), said body section having a first end piece (14) and a second end piece (16); an encapsulation member (24) which encloses the body section between the end pieces secured thereon, wherein potting material (34) is fitted between the encapsulation member and the body section, wherein the encapsulation member has a corrugated bellows form comprising a plurality of corrugations over its entire length wherein said second end piece comprises a ball-joint (40) having a central opening (50) which is sealed after the potting material has been introduced into the encapsulation member. The invention also discloses a process for assembling said actuator arrangement.

Description

technical field [0001] The invention relates to an actuator arrangement for use in a fuel injector of the type intended for use in a fuel system of an internal combustion engine. More specifically, the invention relates to the packaging of actuator means for fuel injectors of the accumulator or common rail type, the type controlled by means of piezoelectric actuators. Background technique [0002] It is known to use piezoelectric actuators in fuel injectors of internal combustion engines. Such piezo-operable fuel injectors provide a high degree of control over the timing of injection events in the combustion cycle and the volume of fuel delivered during each injection event. This allows for improved control of the combustion process, primarily to keep pace with increasingly stringent world environmental regulations. These fuel injectors can be used in compression ignition (diesel) or spark ignition (gasoline) engines. [0003] A typical piezoelectric actuator unit designe...

Claims

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Application Information

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IPC IPC(8): F02M63/00H01L41/053
CPCF02M2200/215F02M63/0057F02M63/0026H01L41/0533H10N30/883
Inventor X·博德里M·科尔克曼
Owner DELPHI INT OPERATIONS LUXEMBOURG S A R L
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