US1872609A

US1872609A - Crankcase ventilation

Info

Publication number: US1872609A
Application number: US424625A
Authority: US
Inventors: Schittke Robert
Original assignee: Motors Liquidation Co
Current assignee: Motors Liquidation Co
Priority date: 1930-01-30
Filing date: 1930-01-30
Publication date: 1932-08-16
Anticipated expiration: 1949-08-16

Description

Aug. 16, 1932. R. scHl'rTKE cRANKcAsE VENTILATION Filed Jan. 50. 1930 Patented Aug. 16, 1932 ROBERT SOHITTKE, or LANSING, MICHIGAN, AssiGNoia To GENERAL ivio'ions CORPORA- TION, OF DETROIT,

CRANKCASE 'VENTILATIONv Application'led January 30,

It isan object of this invention to ventilate an engine crankcase by means such as a fan or blower combined with a gear and so secured upon one of the usual engine-comprised shafts as to obviate all necessity foi' the employment of additional housing.. or bearing or driving means vfor the fan or blower element; and preferred embodiments of the present invention contemplate such a 1o modification and use of a driven sprocket on one end of the camshaft as to effect a continuous movement of air through, and prefera-bly an ejection of air from, the crankcase whenever the engine is in operation.

Broadly, it is an obj ect of this invention to provide simple, inexpensive and concealed but'nevertheless eflicient means to withdraw water and other vapors from an engine crankcase,-thereby minimizing union of these vapors with chemical elements which would cause corrosion and also obviating formation of ice during cold weather; and it is also an object of this invention to provide a novel gear, suitabl for use in various machines requiring ventilation.'V This gear may comprise not only means for effecting a movement of air therethrough but means for the terminal attachment of said gear to a shaft through which motion is transmitted to additional parts; and preferred embodiments of the invention may involvek the use of not only curved blades or impeller elements between the hub and the periphery of a. sprocket, but also some use of a` conical or other flow-guiding element, either rotative or stationary, and/or the use of stationary curved blades, and/Or the use of someA special outlet supported by or comprised in a cover tting, as hereinafter described.

@ther objects of the present invention may be bestappreciated by the following description, taken in connection with thel appended claims and the accompanying drawing.' A

Figure 1 is a vertical sectional view through the front end of an engine in which the invention is embodied. Figure 2 is a vertical section, taken substantially as indicated by the line 2-2 o-f Figure 1, or the line 2-2 of Figure 4.

Figure 3 is a vertical sectional view, taken MICHIGAN, A' CORIORATION OIE DELAWARE ieao. sensing. 424,625.

substantially implied'b-y the broken line 3-3 of Figure 1.

Figure 4 is-a view comparable with Figure 1, butl showing an alternative `type of air exit fitting. t v

Referring first to shown in the conventional features drawing, crankcase 10 may be providedy with an oil pan 11 and include or enclose any desired structural f elements,-

such as partial portion web 12 for the support of a crankshaft 13 anda camshaft 14,

motion may be transmitted between which by means `comprising a lower sprocket gear 15, and a sprocket chainl. Coming now yto novel features, the mentioned crankcase isshown as comprising also a special front closure openings for the advance of air;

16 is shown as extending over sprocket chain a novel gear 18, whi

plate 17, provided with and the ch serves not only to transmit motion to the camshaft 14 vbut to advance air, for a Ventilating effect,through the mentioned openings in the cover-plate 17.

.The gear 18 is shown as concave, u

substantially conical web 19. This web with air inlet openings ing a n is provided-not only compris- 2O but with ,backwardly'inclined blades 21,-

extending inwardly to a point near the mentioned openings and outwardlyto a substantially cylindrical tooth-carrying flange Q2,- the curvature of the blades 21 being such as to produceva fan or centrifugal blower effect during rotation of the gear the edge of flange 22.

as terminally secured to the 18, to deliver air past The gear 18 is shown shaft 14 by means comprising apin 23 yand machine screws 24;

and it may be 25 of shaft 14 extends The coverplate 17 any desired number of provided with an opening such as that through which a projecting portionV to center it on shaft 14. may be provided with air inlet oroutlet openings 29, shown in Fig. 1 as normally concealed by an outlet fitting or air-directive element 80. This maybe seated upon a gasket 31 in a circular or other groove and may be secured by means such as is shown las provided tending flange 33,

Ythe mentioned flange flanges cooperating to a screw 32. The

plate 17 with an inwardly eX- substantially opposite 22 of gear 18,-said define a blower chamber; and the air-advancing effect obtained by rotation of the backwardly inclined blades 21 may be enhanced by the interposition of suitable guide means, such as a conical element 34.

In preference to securing' this conical element to the'ge'ar 19, it may be carried by means such as an inward projection or boss 35, shownas integral .with-,the cover plate 17 ,gand said boss may, if` desired,;bechamberedi to receive a spring-pressed bearing 0r retaining element 36 pressing against a small' circular plate 27, to axially locate shaft 14. If desired, further to contribute'to'the'efficiency ofthe describedA combination gearand blower, the plate 1'7 'may be additionally provided with` integral or other stationary.` blades 37 adapted'y toK direct any," `airv ywhich has advanced between substantially parallel outwardlyfconvergentpwalls provided by web 19 and' conical p'latee'., The mentioned stationary blades tendto' obviate mere ed'dying or turbulent disturbance of-ltheair and' to deliver the sameth'rough openings :29' and the fitting v 0,-i`f'the latter is' employed and if the concavity of gear ,18 is outwardly" disposed and if'said gear isrotatedinthe' direction aboveindicated'. y. l. .y l.. .4 n y ,The stationaryjbla'des 37 and the fitting 34 should"beunderstoodto' servevnot only' for the guidance of the` airbut asa means, cooperatin'g'y with mentioned movabl'ean'd station# ary parts', inthe elimination of droplets of any Oily or other' vapors which ma.,v be; pulled over'vvith the ain-,theientraifneddroplets -bejing'either throwi'i'to the' periphery ofthegear 1'8 or received' by'V the plate 171er parts 'carried thereby in such marinerfas tet and drip through the narrow slot between flange 33 and gearwlS back intothe pan 1l, or its: equivalent. The fitting 30 is shownas provided ywithv an air outlet opening 38, surrounded by an inwardly turned, flange `39ethe configuration of the fitting 30, thefposition of the ope-ning 38 and the shape lof rthe flangefg being such as to reduce or obviateundue baclrpressure, as resulting from the advance ofthe engine when used upon an automotivevehicle, and also to obviate' drip of condensatetherethrough. A pipe maybe inserted in or fastened .to opening 38 softo convey` the vapors toany desired point of discharge',V andthe formf'shown in Figure/i will be seen` to differ from that shown in preceding figures primarily' vin that, for the veffects last referred to, the front cover plate 17 is provided with la special opening 29', occupying an elevated positionurelatively to an axis of shaft 1li-air being upwardly and rearwardly delivered therefroml by means of a comparatively simple elbow fitting 30?,V

opening at 3.8.

In both of the described embodiments, it will be understood that the special gear 18 is ordinarilyso rotated as to advance air outwardly rather than inwardly; and air may accordingly be admitted through any usual or preferred means, such as a

filler pipe

40 or 40, disposed near either end, but preferably nearer the rear end, of a cranlrcase; and the air so admitted will be seen to be drawn upwardly past web 12 or through any desired openings 41 therein, advancing to a vent or vents in the general manner above described andas indicated by various arrows.

Although the foregoing description has included specific reference to but one type of gear randf'to but two types of outlet littings, it should be understood not only that various features of the present invention might be independently employed, and that the disposition ofthe convexity in gear 18 musty depend upon whether an outwardv or an inwardv movement of air is to be effected thereby, but also that various features of this invention might be independently em-' ploy'ed, and that numerous additionalV modifications might easily be devised, by workers informed of the foregoing, without involving the slightest departurel from the present invention.

I claim:

1. vIn an internal combustiony engine 1' a crank'case having a Aventilation opening; an engine-comprised shaft carrying agear in proximity to saidv opening and means, in-' cluding blades upon said gear, for advancing air through said opening-said shaft beinga camshaft of said engine. v

2.' In an internal combustion engine: a

cranlca'sehaving a ventilation-opening; an

engine-comprised shaft carrying a gear in proximity to said opening; and means, including .lades upon said gear, for advancing air through said opening-said gear being a sprocket gear for driving said shaft. Fl s 3'. In anV internal combustion engine: a crankcase having a ventilation opening; an engine'comprised shaft carrying a gear 'in proximity to said opening; and' means, including' blades upon said gear, for advancing air through said opening,-said gear beingterni'inally secured to said shaft.

l. In an internal combustion engine: a cranlrcase having a ventilation opening; an

engine-comprised shaft carrying a gear inr proximity to said opening; and means, including blades upon said gear, for advancing air through said opening, -said gear comprising a concave web having air passages between said blades.

5. In an internal combustion engine: a cranlcase having a ventilation opening; an engine-comprised shaft carrying a gearin proximity Ato saidl opening; and means, 1ncludingblades upon said gear, for advancing air through said opening, said gear comprising a concave web having air passages between said blades and near the inner .ends thereof.

6. In an internal combustion' engine: a

cranlrcase having a ventilation opening; an engine-comprised shaft carrying a gear in proximity to said opening; and means, including blades upon said gear, for advancing air through said opening,-said lastmentioned means comprising stationary blades disposed opposite the blades of said gear.

7 In an internal combustion engine: a crankcase having a ventilation opening; an enginescomprised shaft carryin a gear in proximity to said opening; an means, including blades upon said gear, for advancing air through said opening,-said lastmentioned means comprising a conical plate disposed opposite the blades on said gear.

8. In an internal combustion engine: a crankcase having a ventilation opening; an engine-comprised shaft carrying a gear in proximity to said opening; and means, including blades upon said gear, for advancing air through said opening,-said opening being provided With an air-direotive fitting.

9. In an internal combustion engine: a i

cranlrcase having a ventilation opening; an engine-comprised shaft carrying a gear in proximity to said opening; and means, including blades upon said gear, for advancing air through said opening,-said opening being an outlet opening provided with means to obviate an exit of entrained oil globules therethrough.

10. In an internal combustion engine: a crankcase having a ventilation opening; an engine-comprised shaft carrying a gear in proximity to said opening; and 1neansin cluding blades upon said gear, for advancing air through said opening,-said crankcase including a cover plate through which said opening extends.

11. In an internal combustion engine: a crankoase having a ventilation opening: an engine-Comprisedshaft carrying a gear in proximity to said opening; and means, including blades upon said gear, for advancing air through said opening,-said crankcase including a cover plate through Which said opening extends, and said opening being provided with an air-directive fitting.

12. In an internal combustion engine: a crankcase having a ventilation opening: an engine-comprised shaft carrying a gear in proximity to said opening; and means, including blades upon said gear, for advancing air through said opening,-said crankcase including a cover plate through which said opening extends, and said plate being provided With blades substantially adjacent said opening.

13. In an internal combustion engine: a crankcase having a ventilation opening: an engine-comprised shaft carrying a gear in proximity to said opening; and means, including blades upon said gear, for advancing air through said opening,-said crank-