Piezoelectric direct-driven fuel injector with rotation type valve core

Abstract

The invention belongs to the field of a fuel injector of a fuel injection system of an internal combustion engine and particularly relates to a piezoelectric direct-driven fuel injector which directly drives the valve core of a fuel injection nozzle to realize the turn-on or turn-off of fuel injection by utilizing the electrogenerated displacement of a ceramic piezoelectric stack. According to the piezoelectric direct-driven fuel injector with the rotation type valve core, displacement is amplified by a mechanical type displacement amplifier through the utilization of a characteristic of a piezoelectric ceramic material that the displacement is generated in the power-on state, and linear motion is changed to rotary motion so that the valve core is driven to control the opening or closing of an injection hole; the piezoelectric direct-driven fuel injector mainly comprises a fuel injector body, a piezoelectric actuator, an ejection rod, the valve core, a valve seat, a return spring, a fine adjustment nut, a sealing nut and the like. By the adoption of the piezoelectric direct-driven fuel injector with the rotation type valve core, the direct driving of the valve core by the piezoelectric actuator is realized through the rotation type valve core; the structure is simple; the response is sensitive; the impact vibration is weak; the effect of energy conservation and emission reduction is quite good.

Description

technical field [0001] The invention belongs to the field of fuel injectors for fuel injection systems of internal combustion engines, in particular to a piezoelectric direct-drive fuel injector which directly drives the rotation of a valve core of a fuel injector by using the electric displacement of a ceramic piezoelectric stack to realize the opening and closing of fuel injection. Background technique [0002] As one of the main driving forces in industry, agriculture, construction, transportation and other industries, the demand for internal combustion engines has been growing rapidly and has played an important role for a long time. National physique, future generations, and saving the earth are major issues, so increasingly stringent energy-saving and emission policies are imperative and are being gradually implemented. [0003] The fuel injector is a device that injects the fuel from the high-pressure oil pump into a specific position in the combustion chamber with a ...

AI Technical Summary

Problems solved by technology

Traditional electromagnetic actuators can no longer directly meet the National IV (Euro IV) emission standards. It is necessary to add exhaust gas treatment devices, which makes it more difficult to meet the requirements of National V. It has become a trend to replace electromagnetic actuators with ceramic piezoelectric actuators.

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