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Title:
PLUNGER FUEL INJECTOR AND INTERNAL COMBUSTION ENGINE
Document Type and Number:
WIPO Patent Application WO/2020/098179
Kind Code:
A1
Abstract:
A plunger fuel injector, comprising: a body (1), wherein the body (1) is provided with a plunger hole, an inlet (5) of a fluid to be injected, an injection opening (6), and a lubricating oil inlet (7); a lower plunger (2) slidably fitted in the plunger hole, wherein the lower end of the lower plunger (2) is configured to open or close the injection opening (6); an injection chamber (8) formed between the lower end of the lower plunger (2) and the inner wall of the plunger hole, wherein said inlet (5) and the injection opening (6) are both configured to be in communication with the injection chamber (8); an upper plunger (3) slidably fitted in the plunger hole; a lubricating oil chamber (9) formed between the lower end of the upper plunger (3), the upper end of the lower plunger (2), and the inner wall of the plunger hole; a first one-way valve (10), wherein the lubricating oil inlet (7) is configured to be in communication with the lubricating oil chamber (9) by means of the first one-way valve (10); and a first resetting device (4) configured to provide a force to the upper plunger (3) for moving downwards. Also provided is an internal combustion engine comprising the plunger fuel injector. The plunger fuel injector and the internal combustion engine can reduce the problem of leakage while increasing injection pressure.

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Inventors:
SUN HAIDONG (CN)
GUO YONGQING (CN)
XIANG GUIRONG (CN)
Application Number:
PCT/CN2019/076980
Publication Date:
May 22, 2020
Filing Date:
March 05, 2019
Export Citation:
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Assignee:
SHANGHAI OLAHMOTORS CO LTD (CN)
International Classes:
F02M47/04; F02M61/10
Domestic Patent References:
WO1997012145A11997-04-03
Foreign References:
CN109209710A2019-01-15
CN209067392U2019-07-05
CN108533430A2018-09-14
CN103443440A2013-12-11
CN105587452A2016-05-18
CN104251203A2014-12-31
CN101871391A2010-10-27
Attorney, Agent or Firm:
BEYOND ATTORNEYS AT LAW (CN)
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