US1790999A

US1790999A - Valve-operating mechanism

Info

Publication number: US1790999A
Authority: US
Publication date: 1931-02-03
Anticipated expiration: 1948-02-03

Description

85 3, w33- N. PERKHNS VALVE @mamme MEGHAMSM Filed April 9, 1950 2, snetsmshem 2 g j iNvaNmR Patented Feb. 3,-l931v i f i Y* i KK UNITED STAT.es piifrltJT-11,. CEl

' JOHN nIcrfo'LAsfPERxINs, or -RICHMONDQVIRGIZMA vALvn-ornnniiine `iiiiicifnfiivrsiii Application ined April' 9, 1930. seriainp.' Maele.'v

My invention relates to means for silencing Figure 6 is a horizontal-section on the line the action of the valve mechanism of internal Y 6+6 of Figure 1. v ,combustion engines Vand the likeLa-nd it par- Figure 7 is an inverted plan of the compcn ticularly has for its object to provide a simsating unit. p

M5 ple, inexpensive device'that can readily be Figure 8 is a vertical longitudinal section 50 installed in new'or old engines and will efof a modified form ofamy invention. fectively eliminate noise. L n Figure 9' is a perspective view-of the in- Further, itis an objectto provide means to ner or compensatingunit'of the form shown take up wear in the movement-transmitting in Figure y l Y is means `that conveys the action ofthe cam Figure 10 is a horizontal'section on the line 55 shaft to the valve. f 10-10 of'Figure 8.- f f f Further, it is an object of the invention to In the drawing, inwhich like numeralsfoi provide a device to be interposed between the freferenceindicate like parts in allf of the iigcam shaft and the .valvewhichfwill maintain ures, 1 represents the camY shaft, 2 the cani, i5 a continuous uninterrupted metallic connecand 3. the bearing forthe tappet` llhetap- 6e.

tion between the cam 'shaft' and the valve, pet consists of an outer shell 4 having a calnthus enabling the elimination of the clearengaging end 5, in which shell there is located ance space heretofore usually left between the inner or compensating unit. This unit is the valve ta-ppet and the valve stem or push composed of the lower section 6 having a bore fo rod as the c ase maybe. 7 and a' counterbore 8 `and .being provided e5 l Other objects will lin part be obvious and with concave ballseats 9 on the faceor end 1n part be pointed'out hereinafter. which opposes the upper section' 10 of the To the attainment of the aforesaid'objects unit. i n Y and ends, the invention still further resides The upper section 10 of the unit has a stem T25 in the novel details of construction, combi- 11 which projects into the 'bore 7' andr coun- 7a nation and arrangement of parts, all of which terbore 8, and it also has a recess 12, the pur- Will be first'ully vdescribed inthe following pose of which will presently appear. The detailed description, then Vbe `particularly stem llhas its endslotted asiat 13 to repointed out in the appended claims, reference ceive one end of theftorsion spring 15 whose *T30 being had to the accompanying drawing, in other end is located in the slotY 14 of the sec- 75 which:V tion 6. I Y, Y

Figure l is. averticallongitudinal section A cross .pin 16 carried by the section GeX- illustrating one embod'iin'entzof the invention, tends into the slot112 and serves as a stop te the parts being in the position theyassume limitswivelling motion of the sections 6 and V^ -.35 when the cam has raised the tappet to hold 10 on their common aXis with respect one to se the valve open. y theV other. Theupper vsection 10 has -con- "Figure 2 is a similar View with thepa'rts cave ball seats 17 ,and carries anadjusting), in the position they assume when the valve screw 18 whose head 19 is adaptedto contact S ClOSGd-V l Y the valve stein 2 1y (or push rod as .the case, 40 Figure 3 is a perspective .view ofthe innerl may be)the adJusting screw 18Vbeing held, 85

or compensating unit. by a ]am nut 20.

Figure 4 is a horizontal section on the line 22, designates balls located between `the 4-4of Figure 1. f v concave ballV seats 9 and 1 7 respectively and Y Figure 5is a horizontal section on the line continuously lying in contact with said seats.

. 5 5 5 of Figure 2. f In the embodiment of the invention illus 90 on its vlongitudinal axis.

trated in Figures 6 to 8 inclusive, it will be seen that the inner unit is composed ot the lower section 23 having Vconcave ball seats 24 and a bore 25, while the upper section 26 has lugs 27 provided with concave ball seats 28, the spaces 29 between-the lugs 27 permitting the proyectionoic pins 8O carried on .the lower section 23 Vand cooperating` with th pins to limit the rotational or swivelling motion of the

sections

23 and 26 on theircoinmon axis with relation one to the other.

The upper section 26 also has a recess 3l in which and in theboie 25 a torsion spring 33 lies, the spring having its ends anchored to the

respective sections

23 and 26 by Ypins Balls 34: lie between the .concave seats 24 and 28 respectively and arein Continuous contact therewith. The uppersection 26 of the inner unit is tapped at 35 fertile 'reception of thefusual adjusting screw 18,-the construction of which may be `the saine' as the preceding embodiment oi the invention, as may also be the construction of the. inem- 'ber li.

[n both embodiments of the invention it will be observed that the inner unit is Aiitted into the shell 4 and rests onthe bottom 5, the inner unit being free to turn in the shell In both embodiments of the invention also it will .be observed that the ball seats of the upper and lower sections are struck on a radius of greater lengthjthan theradius of the balls 22 or 34 as the case may ybeso that the

seats

9, 17 or 24, 28 as the-case may be, operate in connection with the balls as camming elements,` maintaining` a metallic thread connection between the yupper and lower sections of the yinner unit- `while permitting those sections to move along the direction or their common axis .toward and from one another to compensate for the expansion and contraction and for any lag in movement ofk the parts of the valve operating mechanism, thereby maintaining a continuous metallic train of elements from the cani shaft to the valve itseli and eliminating the tap due to metallic contact between parts for clearance now so common'- in internal combustion engines. A

Fromthe foregoing description, taken in connection with the accompanying drawing, it is thought the construction, operation and d-.vantages ot my invention will be clear to those skilled in the art to which it relates, and I desire it understood that slight changes in the details o' construction may be .without departing from the spirit of the invention or the scope of the appended claims.

` What I claim is: e r

l. ln valve mechanism wherein is provided a valve and an actuating cam shaft, anda connection between said valve and cam shaft; said connection including a tubular saidV .inner unit comprising two axially aligned sections, a torsionsprlng connecting vsaid's'edtions,means limiting the movement oil onesection relatively to the other under vthe influence of said spring, and continuous-v ly'engaged .cam connections between the opposingends of said sections, said cam con- "ne'ctions comprising opposed concavev seats on the adjacent ends of said sections and balls located between said seats.

3. In valve mechanism wherein is provided a. cam shaft and a valve; 1an operating connection between the same which includes an outer tubular member closed at one end, an

'inner unit fitted within'said member 'to seat on said-closed end, saidvinner unit comprising two axially aligned sections rotatable on their common axis as a unit in said ltubular member and having Vlimited rotation relatively one tothe other, means continuously tending to turn said sections relatively yone to the other in one direction, and .camming elements between said sections for rmoving them along their common axis away from one 'another under the action of said continuously tending means, said camming elements maintaining a contact continuity between lthe ends of all sections at all times for the v purposes specified,

4. Invalve mechanism wherein is provid- 'edi a-Jca'm' shaft and a valve; an operating connection between the same which includes an outer tubular member closed at one end, an'inner unit iitted within said member to seat on said closed end, saidinner unit comprising two axially aligned sections rotatable on their common axis as a unit in .said tubular member andhaving limited rotation relatively one to the other meanscontinuously tending to turn said sections relatively one to theother in one direction, and camming elements between said sections forv moving them along their common axis awayirom one another under the action of said continuously tending means, said camming elements comprising opposed concave seats on said sections and bearing balls in said seats.

5. ln a valve mechanism wherein is provided-a cam shaft and a valve; an operating connection between the same which includes a tappet comprising a shell, an inner'unit slidably and swivelly fitted withinthe shell,

said shell having a bottom on whichsaid unit rests, said unit comprising a plurality oi v axially aligned sections, one having a stem and the other having a passage to receive said y stem, a torsion spring in said other sectionv having one end anchored'to Said other section and its other end anchored to said stem,

means to limit the swivelling action of said sections on their common axls under theinfiuence of said spring, the opposing faces of said sections having concave ball seats and balls in said seats.

JOHN NICHOLAS PERKINS.