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Fuel Injector with Piezo Actuator

A technology of fuel injectors and piezoelectric actuators, which is applied to fuel injection devices with piezoelectric elements or magnetostrictive elements, fuel injection devices, special fuel injection devices, etc., and can solve the problem of shortening the service life of actuators, etc. question

Active Publication Date: 2018-01-19
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The service life of the actuator may thus be significantly shortened

Method used

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  • Fuel Injector with Piezo Actuator
  • Fuel Injector with Piezo Actuator
  • Fuel Injector with Piezo Actuator

Examples

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Embodiment Construction

[0036] figure 1 shows the fuel injector according to the invention in the closed position. A piezoelectric actuator 6 is shown which is accommodated in the holding body 4 of the fuel injector and which is supported on the force transmission part 14 via the adjusting part 30 . The force transmission part 14 has a pin-like section 16 with which it passes through the pressure plate 15 in order to come into contact with the adjusting part 30 . At its other end, the force transmission part 14 has a disk-shaped section 17 which interacts with the coupling device 7 . The diameter of the pin-shaped section 16 is chosen to be significantly smaller than the diameter of the disk-shaped section, while the bore of the pressure plate 15 which receives the pin-shaped section 16 has a narrow guide gap. A seal is thus achieved between the low-voltage region 5 receiving the piezo actuator 6 and the high-voltage region 18 of the receiving coupling device 7 and the piezo actuator 6 is protected...

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Abstract

The invention relates to a fuel injector for a fuel injection system, in particular a common rail injection system, comprising a nozzle needle (3) that is guided in a high-pressure bore (1) of the nozzle body (2) so as to be able to carry out a stroke movement, by means of which at least one injection opening can be released or closed, a piezoactuator (6), received in a low-pressure zone (5), for directly controlling the stroke movement of the nozzle needle (3), and a coupling mechanism (7) via which the piezoactuator (6) is hydraulically coupled to the nozzle needle (3). According to the invention, the coupling mechanism (7) comprises a coupling volume (8) which is formed inside a sleeve-shaped coupling piston (9), said coupling piston (9) being guided via an inner pin (10) that delimits the coupling volume (9) in an axial direction so as to be able to carry out a stroke movement, an end section (12) of the nozzle needle (3) extending into the coupling volume (8) or into a fuel volume connected to the coupling volume (8).

Description

technical field [0001] The invention relates to a fuel injector for a fuel injection system, in particular a common rail injection system. [0002] Such a fuel injector comprises a nozzle needle for opening and closing at least one injection opening guided in a stroke movement in a high-pressure bore of the nozzle body, a pressure received in a low-pressure region for directly controlling the stroke movement of the nozzle needle An electric actuator and a coupling device via which the piezoelectric actuator can be hydraulically coupled to the nozzle needle. Background technique [0003] From DE 10 2009 001 131 A1 a fuel injector is known which has a piezoelectric actuator arranged in the low-pressure region of the injector for directly controlling the stroke movement of the nozzle needle, in which fuel injector The nozzle needle is arranged largely pressure-balanced. For this purpose, a plunger-like projection is arranged on the nozzle-side end of the nozzle needle, which ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M61/10F02M51/06F02M63/00
CPCF02M51/0603F02M61/10F02M2200/21F02M2200/701F02M2200/704F02M2200/708
Inventor H·拉普
Owner ROBERT BOSCH GMBH
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