Fluid sprinkling – spraying – and diffusing – With heating or cooling means for the system or system fluid – Heating means
Reexamination Certificate
2002-04-01
2003-06-17
Evans, Robin O. (Department: 3752)
Fluid sprinkling, spraying, and diffusing
With heating or cooling means for the system or system fluid
Heating means
C239S128000, C239S130000, C239S132000, C239S133000, C239S585100, C239S585200, C239S585500
Reexamination Certificate
active
06578775
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATION
This application is based on Japanese Patent Application No. 2001-100309 filed on Mar. 30, 2001, the disclosure of which is incorporated herein by reference.
FIELD OF THE INVENTION
The present invention relates to a fuel injector of an internal combustion engine.
BACKGROUND OF THE INVENTION
It is recognized that heating of fuel during cold engine starting will reduce harmful components in exhaust gas. In a fuel injector, a heating element is generally provided radially outside of a vale body to heat fuel in the valve body and atomize it during cold starting. As the heating element, a ceramic heater is widely used. In a fuel injector
100
shown in
FIG. 8
, for example, a valve member
101
opening/closing a valve seat orifice has a cylindrical shape having a bottom. A valve body
103
encloses the valve member
101
and supports it to reciprocate. A ceramic heater
102
in the cylindrical shape is provided on the outer periphery of the valve body
103
.
SUMMARY OF THE INVENTION
It is an object to provide a fuel injector in which fuel is effectively heated and atomized.
It is another object to provide a fuel injector in which a ceramic heater is mounted without being damaged.
It is a further object to provide a fuel injector in which a ceramic heater is tightly fitted to improve heat conductivity.
It is a still further object to provide a fuel injector in which fuel is effectively heated irrespective of variation in the size of a ceramic heater.
According to one aspect of the present invention, a plurality of ceramic heaters is provided on the outer periphery surface of a valve body. Each of the plurality of ceramic heaters has an arc shape in cross section and arranged in a circumferential direction to surround the outer periphery of he valve body. According to this, the plurality of ceramic heaters is mounted without being damaged and tightly fitted on the outer peripheral surface of the valve body. Ther fore, heat from the plurality of ceramic heaters is effectively conducted to the valve body. As a result, fuel in the valve body is effectively heated.
According to another aspect of the present invention, a heating element is press fitted in a holder and the holder is press-fitted to a valve body. The valve body defines a fuel passage therein and a valve member is supported in the valve body to reciprocate in an axial direction. Accordingly, it is not necessary to press-fit the ceramic heater on the valve body. Since the holder contacts both of the heating element and the valve body, heat from the heating element is not only directly conducted to the valve body but also conducted to the valve body through the holder. Therefore, the fuel is effectively heated.
REFERENCES:
patent: 5758826 (1998-06-01), Nines
patent: 5915626 (1999-06-01), Awarzamani et al.
patent: 6109543 (2000-08-01), Bright et al.
patent: 6422481 (2002-07-01), Ren et al.
patent: 54-112917 (1979-09-01), None
Denso Corporation
Evans Robin O.
Nixon & Vanderhye PC
LandOfFree
Fuel injector does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fuel injector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fuel injector will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3120669