US1915586A

US1915586A - Valve actuating mechanism

Info

Publication number: US1915586A
Application number: US95361A
Authority: US
Inventors: Calvin C Williams
Original assignee: Individual
Current assignee: Individual
Priority date: 1926-03-17
Filing date: 1926-03-17
Publication date: 1933-06-27
Anticipated expiration: 1950-06-27

Description

June 27, 1933. c. c. WILLIAMS VALVE' ACTUATING MECHANISM s sheets-'sheet 1 Filed March 17,- 1926 IIIIIIIIIII June 27, 1933. C, WILLIAMS 1,915,586

VALVE ACTUATING MECHANISM Filed March 17, 192e 5 sheets-sheet 2 June 27, 1933- c. c. WILLIAMS VALVE ACTUATING MECHANISM Filed March 17, 1926 3 Sheets-Sheet 5 Patented `lune 27, i933 misses PATENr, orifice CALVIN C. WILLIAMS, OF PHILADELPHIA, PENNSYLVANIA VALVE ACTUATING- MECHANISM Application filed March 17, 1926. Serial No. 95,361.

- This invention relates toaan Aimproved fvalve actuating mechans'm of the general character disclosed in my copending appli- ,cationl for a similar invention, filed' November 26,1924, Serial No. 752,400, and seeks,

among other objects, to provide an overhead valve mechanism wherein wear and looseness between the parts will be automatically taken up andy rattling prevented.

The Vinvention seeks, as a furtherobject, to accomplish the automatic expansion and contraction of the push rod employed without the necessity'for rotating anyv of the parts'.

Still another object of the invention is to embody a novel slip joint in the push rod, of such constructionthat the inertia of the parts will provideV sufficient thrust to eect the partial slipping of the joint and corresponding contraction of the push rod.

And the'invention'seehs, as a'stilly further n object, to provide a mechanism composed of *few and simple parts, 'ivhich willmeet the extreme demands of hard usage and which l -may be readily installed Auponengines now in use in lieu of the usual overhead valve mechanisms.

Gther objects of the invention not specifically mentioned in the foregoing will appear during the course of the following Vdescription. n

In theaccompanying drawings Figure 1 is avertical sectional view showing my improved mechanism in connection "with a conventional overhead valve.

VFigure 2 is a View similar to Figure l, but

showing the push rod of the mechanism contracted. Y

Figure 3 is a transverse sectional view on the line 3 3 ofFigure v1, `looking' in the direction indicated by the arrows. y

Figure 11 is a vertical sectional viewvshowing a slight modification of the invention.

`Figure 5 is a transverse sectional view on the line 5-5 of Figure 4, looking in the di- Y rection indicated by the arrows.

Referring now .particularly to Figures 1, 2 and 3 of the drawings, the numeral 10 indi- 'cates a. fixed tappet guide, andfslidable through said guide is a tappet 11 operable by a `cam shaft 12. At its upper end, the tappet is provided with a socket 13 and abutting the upper terminal of the tappe-t is the joint cuplet of the slip oint of the push rod employed, said cup having a stud 15 fitting in the socket. The joint cup is formed with a conical inner face 1G, and projecting from the upper end of said cup is an overhanging annular flange 17.

A lining with the tappet 11 is the push rod stem 1S, provided at its lower end with an enlarged cylindrical foot 19 terminating-in a joint cone 2O which extends into the cup 14C axially thereof, and formed on the upper end of the stem is a ball head 21. Resting on the upper end of the foot 19 is a housing 22 which, at its, lower end, is of a diameter `to freely receive the flange 17 of the cup 14 and extends downwardly over said v cup, while at the upper end of said housing is an 0 upstanding sleeve 23 fixed to the stem 18. referably, the push rod stein is, as shown, formed of upper and lower sections, the meeting ends of which are driven into the sleeve 23 so that the sections are thus rigidly 75 connected with each other by said sleeve. Formed in the housing near its lower end is an internal annular groove and engaged in said groove is a split resilient stop ring 24 disposed to engage the liange 17 of the cup"80 14 forlimiting the housing and the pushy rod stem in their 'up-ward movement independently of the cup.

Disposed in the cup 14: to lie between the face 1G thereof and the cone 20of the push 8b rod stem is a series of conical or longitudinallv tapered rollers 25, and slidably fitting the foot 19 of said stem is a follower 26 provided at its lower end with an annular ange 27 which is beveled to seat flat against the larger upper ends of said rollers.- Resting at one end against the upper end lof the housing 22 and atitsopposite end against said flange is a take-up spring 28.

I have shown the present mechanism in connection with a conventional overhead valve 29 which is slidably supported byna cage 30, and normally holding the valve closed is a spring 31, this spring being of'far greater strength than the spring 28. Mount- 'V l to lift the stem 18 of the push rod for taking ed to coact with the upper end of the valve stem is a rocker 32 and, aswill be observed, the outer end of the rocker isy provided with a socket to accommodate the ball head21 of vthe push rod stem so that when the push rod is lifted the rocker will beV actuated for opening the valve. e Asfwill'nowy beseen, the spring 28 will tend up any looseness lbetween said s tfem and the 'rocker 32 as well` as 'any looseness betweenv the rocker and the stem ofthe valve 29, and

I- will also tend to advance the rollers 25 downwardly within the cup 14 tobind between-the face 16 of said cup and the cone 20 of the e stem. 'According-ly, play between the 'cone and the cup will eliminated. v n Assuming now thatkthe tappet is raised, as shown in Figure 2,'it Will be seen that the be ktaken up and all looseness upward thrustof the tappet will be transmit- 'tedfdirectly cto. the rollers 25 and, of course,

at the instant such upward lthrustis transmitted to said rollers, the push rod, rocker,

f and valve will'be at rest. Accordingly, the `inertia of these parts will be 'sulicient to maintainftlie push rod stationary momentarily and oppose the upward thrust of the tappet with suicient force to cause Yan upward endwise slippingfof the rollers with a e coincident upward movement`V of the cup independently ofthe c'one. Thefllower'Q is,

therefore, shifted-upwardly by the rollers tocompress the spring 28. and due to the difference in the singularity of the face 16 of 4 thefcup and the face of the cone. the 'rollers are, of course, independentlyT shifted'- upwardly a distance'greater than the'indep'endent'upward movement of the cup. The push rodis'thus automatically contracted', but as the tappet continues'in its upward movement and the inertia of the pusli'rod stem, rocker, valve, and valve 'spring'ls overcome, the upward slipping of the rollersis arrested sub- *stantially at the instant the push rod stem begins to yield to the upward'movement of the tappet, when said rollers wedge between the face 16 of the cup and the cone 20 to provide a rigid connection between said kcup and "the push rod stem so that the valve is opened.

vDueto the automatic contraction of the push rod as the valve is opened, the opening travel imparted to the valve willr be correspondingly g shortened.

`the return "of the tappet downwardly, the

vvalve will seat` before the tappet reaches the bottom of its throw so that the stemV 178 of the pushirod willbe ,relieved of the downward pressure .exerted thereon bythe valve spring 31.* 'As a result, the spring 28will, as the rtapl petcornpletes ,itsY downward' movement, eX- e pand Vfor lifting the stem V18 of the push rod y and yagain Vshifting .the rollers.V downwardly l1 Vwithin the cup, so that theparts will be reyclosing travel of the valve.

turned to their original position, as sho/wn in Figure 1, while all looseness between the parts will be automatically taken up. Battling will thus be effectually prevented. As will be seen, should the valve fail to seat properly, the push rod will automatically expand to compensate forthe shortened closing travel ofthe valve while, when the valve is subsequently permitted to move into engagement with its seat, the push rod will automatically contractl `to Vcompensate for the increased In'Figures 4 and 5 of the drawings, I have shown a slight modification of the invention wherein the joint cup is rotated to assist in .the contraction of the rod. A cam shaft is indicated at 33 and one of the cams thereof Yat y34. Disposed above the cam shaft is a ixed push rod guide 35 having an oblique bore therethrough, and slidable through said bore is a tappet 36 having a foot 37 to coact with the cam 34. The tappet is thus tilted with respect to the vertical in the plane of Y the cam shaft so that the cam 34 will engage lm'inal of the tappet is a joint` cup or member 39 havmg a stud 40 which is freely received in saidsocket. This Studis vprovided at its lower endwith anotch 41, and extending across, the socketi3 of the tappet is a pin 4Q whichis, freely received insaid notch to coa'ct with the stud for turning the cup as the Vtappetuis rota-ted.Y The cupv 39 is provided wlthfa-,conical face, 43, and except for the notrcl141 1n the stud 40 of the cup, said cup is identical with the ycup shown in thev prior embodiment of the invention. Extending into the cup is the joint cone 44 onthe foot 45 of the push rod'. stem, 46, the stem being provided atits upper end with a ball headf47 to coact with the rocker indicated at 48'. Disposed within the cup to coactwith the cone 44 is a seriesoftapered-rollers 49, and fixed d. 1 vi,to the stem 46 is ahousing 50 which extends A @COT mgl pon downwardgfoverthe cup and carriesa stop ring 51." oacting with the rollers V49 is a `follower' 52, and pressing the follower'downwardly is a

spring

5,3. All of these parts are `identical with correspondingfparts as femployed in the prior vembodiment ofthe invention and function inflike manner. Fixed to the stem 46 to coact with the cylinder block yof the engine or" other adj acentpart vthereof Vis a projecting stop pin 54y limiting the stem against rotationwith the tappet 36 and cup CTL l39. Accordingly, as will be seen, as the cup 39 is raised and rotated by the tappet and the rollers 49 are shifted upwardly within the cup, said rollers will be rotated within the cup around the clutch cone 44. This rotation of the rollers will tend to produce as well as pronounce the momentary upward slipping of the rollers between the face 43 of the cup and the cone so that as the push rod is raised, said rod will be automatically contracted.

Having thus described the invention, what I claim is i l. In valve actuating mechanism, a cup, a cone extending into the cup, and rollers disposed between the cone and cup to coact therewith for limiting the cup against movement toward the cone but shiftable to permit such movement by thrust exerted on the cup.

2. In valve actuating` mechanism, a cup, a cone extending into the cup, rollers disposed between the cone and cup to co-act therewith for limiting the cup against movement toward the cone but shiftable to permit such movement by thrust exerted on the cup, and a spring resisting the shifting of said rollers.

3. In valve actuating mechanism,a cup, a cone extending into the cup, rollers disposed between the cone and cup to coact therewith for limiting the cup against movement toward the cone but shiftable to permit such movement by thrust exerted on the cup, a follower coacting with the rollers, and a spring acting on the follower for resisting the shifting o-f said rollers and tending to expel the cone from said cup. y

4.' In valve actuating mechanism, a tappet, a cup carried thereby and provided with a conical face, a push rod stem having a cone extending into the cup, conica-l rollers lying between the cone and said face to coact therewith for resisting movement of the cup toward the cone but shiftable to permit such movement by thrust of the tappet, a follower coacting with the rollers, and a spring acting on the follower for resisting the shifting of `the rollers and tending to expel the cone out of the cup.

5. In valve actuating mechanism, coacting members, means coacting with said members for limiting one of the members against movement toward the other member but shift-able to permit such movement by thrust exerted on one of the members, means for rotating one of the members and accelerating the shifting of said first mentioned means, and means for limiting the other of the members against rotation.

6. In valve actuating mechanism, the combination with a cam shaft having a cam, of

a tappet inclined with respect to the shaftl for engagement by the cam at one side thereof only whereby the tappet will be rotated, coacting members, one of saidmembers being rotatable with the tappet, means coacting with said members for limiting one of the members against movement toward the other member but shiftable to permit such movev ment. bythe thrust of the tappet, and means limitlng the other of said members against rotation.

7. In valve actuating mechanism, companion members, one of which is provided with an internal cone shaped face and spacingl rollers interposed between said members to coact with said face and shiftable by the wedging action of one of said members to permit movement of the members toward each other.

In testimony whereof I aflix my signature.

CALVIN C. l/VILLIAMS. [Ls]