Title:
PIEZO-INJECTOR FOR INTERNAL COMBUSTION ENGINE
Document Type and Number:
Japanese Patent JP3854120
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To downsize a piezo-stack, thus attaining cost reduction.
SOLUTION: An injector 10 includes the piezo-stack 12 formed by layering a number of piezo-electric devices, a small-diameter piston 15 which slides in an injector body 11 according to an expansion motion of the piezo-stack 12, a ball valve 20 which is disposed in a high pressure chamber 21 for introducing high pressure fuel corresponding to injection pressure and cuts off the high pressure fuel with a spherical outer-periphery surface, and a nozzle needle 27 which is retained at a valve closed position by making the high pressure fuel work on a back surface. When the piezo-stack 12 is expanded, the front end face of the small diameter piston 15 presses the outer-periphery surface of the ball valve 20 to leak the high pressure fuel to a low pressure side, thus performing fuel injection from the front end part of the nozzle needle 27. The front end of the small-diameter piston 15 is of column shape, and a cone-shaped recess is formed at the top end surface. It is thus possible to bring the small- diameter piston 15 into line contact with the ball valve 20.
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Inventors:
Arikawa civilization
Kei Nishikori
Kojima Showa
Kei Nishikori
Kojima Showa
Application Number:
JP2001315925A
Publication Date:
December 06, 2006
Filing Date:
October 12, 2001
Export Citation:
Assignee:
株式会社日本自動車部品総合研究所
株式会社デンソー
株式会社デンソー
International Classes:
F02M47/00; F02M47/02; F02M59/44; (IPC1-7): F02M47/00; F02M47/02; F02M59/44
Domestic Patent References:
| JP2001227429A | ||||
| JP2001241350A | ||||
| JP2003511625A |
Foreign References:
| WO1999001578A1 | ||||
| WO2001023754A1 |
Attorney, Agent or Firm:
Hironobu Onda
Makoto Onda
Makoto Onda