Patent Application Titled "Oil Mist Separator" Published Online (USPTO 20160177890)
By a News Reporter-Staff News Editor at China Weekly News -- According to news reporting originating from Washington, D.C., by VerticalNews journalists, a patent application by the inventors KOBAYASHI, Akihiro (Niiza-shi, JP); Mochizuki, Terumoto (Iruma-gun, JP), filed on November 23, 2015, was made available online on June 30, 2016.
The assignee for this patent application is Mahle Filter Systems Japan Corporation.
Reporters obtained the following quote from the background information supplied by the inventors: "The present invention relates to oil mist separators for an internal combustion engine, and more particularly to the oil mist separators of a type that separates oil mist from blow-by gas produced in the internal combustion engine.
"In current days, for protecting the environment from pollution, internal combustion engines for motor vehicles are usually provided with a blow-by gas processing system through which the blow-by gas leaking from the combustion chambers to the crankcase is led into an intake system of the engine for burning unburnt components of the blow-by gas. Since the blow-by gas passing through the crankcase contains oil mist that would lower the performance of the intake system, an oil mist separator is usually provided in for example a cylinder head cover for separating and removing the oil mist from the blow-by gas.
"Some of such oil mist separators are disclosed in Japanese Laid-open Patent Application (tokkai) 2009-121281 and Published International Patent Application 2013/179829. The oil mist separator disclosed in the former generally comprises a separator chamber, a partition wall installed in the separator chamber, a plurality of openings formed in the partition wall and an impinge wall installed in the separator chamber at a position downstream of the partition wall. In operation of the engine, the blow-by gas is forced to pass through the openings. With this passing, the blow-by gas is highly accelerated before impinging against the impinge wall, and thus the oil mist in the blow-by gas is suitably separated and removed. The other oil mist separator disclosed in the latter is substantially the same as that of the former except that in the latter, the impinge wall is lined or covered with a fiber laminate for improving the oil mist separation and removing."
In addition to obtaining background information on this patent application, VerticalNews editors also obtained the inventors' summary information for this patent application: "It has been revealed that the oil mist separator disclosed in the latter (viz., Published International Patent Application 2013/179829) exhibits a satisfied oil mist separation performance due to provision of the fiber laminate on the impinge wall.
"However, in the oil mist separator of this publication, fixing the fiber laminate to the impinge wall is entirely made by only bonding or welding, and thus, it sometimes occurs that the fiber laminate comes off from the impinge wall particularly after long use. Furthermore, the work for bonding or welding the fiber laminate to a desired position of the impinge wall is not easy.
"Accordingly, an object of the present invention is to eliminate the above-mentioned drawbacks of the known oil mist separator.
"In accordance with a first aspect of the present invention, there is provided an oil mist separator which comprises a housing body through which an oil mist containing gas flows, the housing body including upper and lower members that are coupled to constitute therebetween a gas flow passage for the oil mist containing gas; and a separator unit installed in the gas flow passage, the separator unit comprising a front unit including a perforated plate and a plurality of holding studs extending rearward from the perforated plate; a rear unit placed behind the perforated plate, the rear unit including a base plate that is to be intimately put on a rear surface of the perforated plate and has an opening sized to permit insertion of the holding studs of the front unit, a plurality of connecting studs extending rearward from the base plate and an impinge plate held by leading ends of the connecting studs; and a fiber material piece put on a front surface of the impinge plate, wherein when the front unit is coupled with the rear unit having the holding studs passed through the opening of the base plate, the fiber material piece is sandwiched between the leading ends of the holding studs and the impinge plate.
"In accordance with a second aspect of the present invention, there is provided an oil mist separator which comprises a housing body through which an oil mist containing gas flows, the housing body including upper and lower members that are coupled to constitute therebetween a gas flow passage for the oil mist containing gas and have at respective inner surfaces mounting grooves that constitute an endless mounting groove when the upper and lower members are coupled; and a separator unit installed in the gas flow passage, the separator unit comprising a front unit including a perforated plate and a plurality of holding studs extending rearward from the perforated plate; a rear unit placed behind the perforated plate, the rear unit including a base plate that is to be intimately put on a rear surface of the perforated plate and has an opening sized to permit insertion of the holding studs of the front unit, a plurality of connecting studs extending rearward from the base plate and an impinge plate held by leading ends of the connecting studs; and a fiber material piece put on a front surface of the impinge plate, wherein when the front unit is coupled with the rear unit having the holding studs passed through the opening of the base plate, the fiber material piece is sandwiched between the leading ends of the holding studs and the impinge plate, and wherein outer peripheral portions of the perforated plate and the base plate are put in the endless mounting groove of the housing body.
BRIEF DESCRIPTION OF THE DRAWINGS
"Other objects and advantages of the present invention will become apparent from the following description when taken in conjunction with the accompanying drawings, in which:
"FIG. 1 is a longitudinally sectioned view of an oil mist separator of the present invention;
"FIG. 2 is an enlarged sectioned and perspective view of an essential part of the oil mist separator of the present invention, which is taken from a front-side position of the oil mist separator;
"FIG. 3 is a view similar to FIG. 2, but which is taken from a rear-side position of the oil mist separator;
"FIG. 4 is a perspective view of a separator unit employed in a first embodiment of the present invention;
"FIG. 5 is a sectioned view of the oil mist separator showing a perforated plate installed therein;
"FIG. 6 is a sectioned view of the oil mist separator showing an impinge plate installed therein;
"FIG. 7 is an enlarged sectioned view of the separator unit taken along the line A-A of FIG. 1;
"FIG. 8 is an enlarged sectioned view of the separator unit taken along the line B-B of FIG. 1;
"FIG. 9 is a longitudinally sectioned enlarged view of the separator unit;
"FIG. 10 is a characteristic graph showing both a pressure loss of the oil mist separator of the present invention with respect to a gas flow rate and for its comparison, that of a comparative example;
"FIG. 11 is a characteristic graph showing an oil mist trapping performance of the oil mist separator of the present invention with respect to the gas flow rate and for its comparison, that of the comparative example;
"FIG. 12 is a characteristic graph showing an oil mist trapping performance of the oil mist separator of the present invention with respect to a pressure flow and for its comparison, that of the comparative example;
"FIG. 13 is a side view of a separator unit employed in a second embodiment of the present invention;
"FIG. 14 is a front view of the separator unit employed in the second embodiment of the present invention;
"FIG. 15 is a sectioned view of the separator unit taken along the line C-C of FIG. 13; and
"FIG. 16 is a sectioned view of the separator unit taken along the line D-D of FIG. 13."
For more information, see this patent application: KOBAYASHI, Akihiro; Mochizuki, Terumoto. Oil Mist Separator. Filed November 23, 2015 and posted June 30, 2016. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=5554&p=112&f=G&l=50&d=PG01&S1=20160623.PD.&OS=PD/20160623&RS=PD/20160623
Keywords for this news article include: Asia, Mahle Filter Systems Japan Corporation.
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