US1610409A - Brake - Google Patents

Description

Dec M'. O. ANTHONY BRAK E Filed Sept.' 25,. 1922 2 Sheets-'Sheet 1 f :4 -4, 5-5 OFig. 2;Fig.v6 is an elevation of a splitjcollar which is used inconnection provide means to give to the'valves-ofv infVV i niv MARCUS O. ANTHONY,0FCLEVELAND, OHIO, ASSIGNOR T5 CONTINENTAL ENGINEER- i ING COBEORATON, OEpOMA-A, NEBRASKA, A CORPORATGN OF NIEIBRIA SIL-A.y y

BRAKE;Y

Application ined september 25,1922. serial N6.y 590,212@v ThisV invention. Arelates `to valves, and par'- 'i l ,ticularly ,to rotary valves for internal combustion engines.v One" of the ob]ects of thek invention is to provide. suitable means .for graduallyV rotating the valve v'as 1t, 1sA operated, particularly on fthe closing `stroke thereof. ,Another object isv tov-provide 4dependable and inexpensive .rotating means.

Of the accompanying drawings, Fig. 1 vifs f an elevation of a `valve and operating meansl therefonmounted 1n van engine casing, the.

ycasing being shown insection; `Eig. is a longitudinal vrsectional elevation of the .valve rotating means whichg'embopdy'the features, of myrinvention; Figs; V3, 4 and 5 are trans.l

verse sections along the respective lines 3-3,

with the device, and Fig/7 isa sectional view along the line 7-7 of F1g-2. l l I f -r For variousr-easons it hasbeen common Yto ternal combustion engines, :a `limited or step i' by 'step' rotary movement-of the valve it is operated, and it has been common to provide such means for rotatingthe valveV as the valve is opening. l have found, however, that itis desirable to impart this rotary movement to the valve as itis closing.` This not only provides for the gradual rotationo the valve which is desirable` to prevent warping or abnormal wearing of the valve or its i seat, but it also imparts aslight rotary move-V ment to the'valve just asitcomes in contact with the seat, so as to more effectively clean the seat ori the valve, and to reduce the et' Y 'ects of the poundingl of the impact, the impact occurring in conjunction ywith a slight rotary relative movement of the valve and the seat. e v

The means which I provide forcarrying out this operation may be applied to any ordinary 'internal combustion engine valve, particularly the ordinary puppet valve 10,

(which, when closed, is seated on a seat 11 kin apartition'12 between the gas inlet'or `the' exhaust outlet 13and the passageway 14 'to the cylinder 15.v v`The valve st em 16 passes through anlordinary stem guide17, and the lower end of the stem abuts against-an 'ordinaryV tappet 18 which isoperated infany suitable manner, such as by means of the cam 19.'

4As the cam'19 revolves, the tappet-18 is orced upwardly and this in turn" opens the.y

valve, andca'spring 2O isadapted to' close'the valve asthe cam 'continues tolrevolve.

In order-to produce a vlimited rotary-move-V ment-ofthe valve asit isclosing, l provide a memberv21ivwhichis Xed inlanysu'itablef vvI6() n manner to. thejlower end thefvalve stem 16. 1n` this instance, prefer to rfix vthe member 21.to 'the valve'stemby ,meansof ,a split collar 22, .whic'lris positioned in `an annularY .recess 23 inthe-lower end `of the vstem l16,;I

and thecollar 22', whichis conical, vwith its periphery converging upwardly,f,passes intof theconical'bore 24 ofthe ymember 21. "Slots 25 are formedA inft-hermember 21'so as to allow these'parated segments ofthe member. when they are pressed downwardly by the ,cey

to forcev inwardly the segments of the member, rand thus to' cause the collar to grip the stein, rllieinner surir'acleQtS of the splitcollar 22 is slightly roughened so as to more fir'r'n`` ly 'grip the valve stem, and the outer. surface ofthe collar vis also roughened or k'nurled v the colf' Y so as to prevent relative movement of lar and the member 211. Y

- The member 21 is provided with lugs 30, which normally play'respectively in the slots 31 in a barrel ,-32 which rotatably encircles vvthe v alvestem.` I The barrel 32'also encircles s l a cylindricalr member 33 Awhich is fixed to a rlhe casing 37 is non-rotatably casing 37. y ixed to the stem-guide 17 by means offa lug 38 passing'finto a`recess 39. vFixed to the upper end of the barrelv32 is a cup 34 which encloses a cam member ;Y A-This member 35 is fixed to the member 33 and has arms Y40 enclosing in theA vcam recesses 41 theV clutch'pins 42. A .retainingfmember 43, lrotatably mounted in vthe bottom of the cup 34, has recesses 44101' retaining ini' upright positions the pins 42.V

` this arrangement w 16 vis 'forced upwardly the barrel '32.wi1l'r r vhen the valve stem lo@ be given a rotary movement bythe action of lugs 30 in 'theslots 31. But on Vthe down" ward'or'closing movement of the valve stem.

the pins 42 f will Vprevent rotation of vthe barrel, and by means of the actionv of the slots 31 on the lugs 3.0 a limited rotary movevment will be given tothe 'member21 hence to the valve stem and valve. The result is produced in the following manner:

l/Vhen the stem is forced upwardly the lugs 30 acting on the sides of the slots 3l will rotate the barrel 32 inthe direction of the full line arrow, Fig. 3, and the clutch pins will not interfere with this rotation. VBut as Y the valve stem moves downwardly under the :force of the spring 20, the lugs 30 acting on the'opposite sides ot the slots 3l, will tend to rotate the barrel 32 in the direction of the dotted linet arrow, F ig. 3. This, however, causes the pins 42 to move along tliecam surfaces 45 andthey thus prevent relative movement of such' surfaces andl the barrel 32. As a consequence, the lugsSO will be lforced sidewise by thewalls of the slots 31 Aand'this will give to the valve stema limited rotary movement onitsdownward stroke. The pins are held. close to" the inner surface of the cupv 34. so as to reduce the loose play lof the clutch, and the'inner surface of the cupv is roughened to increase the effectiveness of the clutch.

rllhis rotary movement will include not only the/member 2l but also the lspring 20 which'presses*againstV the flange 27 of the member 2l. To reduce the friction. opposing such rotation, l provide a ball race 46 yin the annular member 47 which forms a bearing for the upper end of the spring, thus providing means for reducing the friction between the bearing 47 and the iXed members of the device. supported in any suitable manner, such as by Y means lof a. spring 48 lying in a groovein the member V3 The member 4'7'may be By placing the ball race at the upper end of the'device instead of on the memberV 2l, the mass to be moved as the valve stem is reciprocated, is materially reduced, as no `movement of the ball race is required. This is desirable as when the race is moved the inertia of the race and balls not only materially increase the injurious pounding effects astlie tappet forces the stem upward ly, butv when the downward movement commences themomentum of themoving race and balls must be overcome by the spring, and this tends to delay unduly the closing of the valve.

l claim as my invention: Y

A brake comprising a member having Va rotatably mounted cylindrical cup 'opening ywith the respective recesses of said cam member.

hand.

MARCUS o. anrnonr.

In testimony whereof, hereunto rset my

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