US 1270941 A
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Description (OCR text may contain errors)
W. IVI. GOODWIN.
VALVE OPERATING MEANS.
APPLICATION FILED APR. 5. 19H3.
W. M. GOODWIN.
VALVE OPERATING MEANS.
APPLICATION FILED APR.5.19|B.
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Application filed April t5, 19M. Serial No. Ql.
To all wim/m, t may concern:
Be it known that I, WiLLIAM M. Goonwnv, a citizen of the United States of America, and resident of Central Square, in the county ot tlswego, in the State of New York, have invented new and useful lmprovements in Valve-perating Means, of which the following, aken in connection with the accompanying drawings, is a full, clear, and exact description.
This invention relates to certain improvements in valve-operating means for internal combustion engines, involving the use of the usual puppet valves, cam shaft and means for transmitting motion :trom the cams to the valves, except that ll prefer to employ rocker contacts for engagement with their respective cams, the object of which is to maintain uninterrupted connection between each cam and its valve through the transmitting mechanism so that all of the parte necessary to the operation of the valve may move freely, yet positively, with a minimum lost motion and to thereby render such operation substantially noiseless.
ln other words, ll have sought to provide what may be termed a compensating rocker contact spring-pressed into engagement with 'the surface of its cam for the purpose ol taking up any lost motion in the connections between the rocker contact and valve stem, and at the same time causing a gradual, but positive. opening and closing of the valveto reduce the noise and shock incidental to such operation.
A @ther objects and uses relating to specilic parte of my invention will be brought out in the following description.
lln the drawings- Figure l is a vertical sectional view, partly in elevation. of what is commonly known as a side valve and its operating means including the cam shaft and one form of my improved rocker contact.
Figs. 2 and 3 are transverse sectional views taken, respectively, on lines 2-2 and 3 3, Fig. l. Fig. l is a vertical sectional view partly in elevation of a modified construction as used in connection with what is commonly known as valve in the head machines. in which each valve is movable at an angle to a vertical plane.
Fie'P 5 is a vertical Sectional vev of a Specification of Letters Patent.
Patented 'J fr?, wird iturther modii'ied torni adapted to be used with valve in the head engines.
Fig. 6 isa vertical sectional view partly in elevation of another modilication of my invention as used in connection with the side valves similar to that shown in Fig. l, except that a portion of the valve-closing spring is utilized for maintaining` contact between the corresponding rocker arm and its cam.
ln each of the several modifications shown, the valve, as --l-, serves to control one of the ports, as -2-, of an internal combustion engine -3- and is provided with a. stem l-h guided in a bearing or way -5-- of the engine cylinder for reciprocatory axial movement.
A cupshaped collar is secured to the outer end ot' the valve stem debeyond the bearing --ea a suliicient distance to permit the axial movement referred to, and serves to receive one end of a coil spring` -1-7 having its opposite end bearing against a portion of the engine -3-around the guide boss -5-, said spring being` tensioned to close the valve -land hold it closed under yielding pressure in the usual manner.
its shown in l, the outer or lower end ot the valve stein is adapted to be engaged by a coaxial and longitudinally movable tappet screw -tlwhich adjustl ably secured in the upper end of a vertically movable plunger 9- and is locked in its adjusted position by a iam nut -lO-.
'llhe plunger 9 is movable vertically in a guideway -llforming a part of the engine frame, said plunger being held against turning movement hy means of a key -]l2-.
The plunger -9- extends below its guideway -ll and is provided at its lower end with a vt'orked head -13- for receiving and supporting a rocker Contact member *ML- itor engagement with the surface of a. revolving earn -15- of the usual cam shaft -l6- l l'n this particular instance. the valve -l-, tappet -8 and plunger -9-- are coaxial with their axes in the same vertical plane as that o't the axis of' the cam shalt ot my invention vertically movable is pivthe head 13- so that its axis of movement may be parallel with and in the same vertical plane as that of the cam shaft.
The object in holding the plunger Q against turning movement about its longitudinal axis is to keep the rocker M up in operative relation to its operating cam 15 The cam shaft and its cams l5 are rotated in the direction indicated by the arrow, and in each of the several modiiications, the rocker I4- extends laterally some distance beyond opposite sides of a direct line between its axis and that of the cam shaft, the lower contact face thereof being convexed longitudinally and is normally tilted toward the upwardly moving or approaching 'side of the high point of the cam and held in that position, as shown in Figs. l and 2, by means of a coil spring 18 ln the modification shown in Fig. 1-, the rocker contact member M is pivot-ed at 17 to a reciprocatory member or support 9 consisting, in this instance, of one arm of a bell-crank lever which is fulcrumed at, 19 to the engine frame or other available support, and has its other arm provided with a tappet screw 8 and lock nut l0 similar to those shown in Fig. l, except that the arrangement of the screw and puppet falve are reversed over that shown in Fig. l.
rlfhe toe ot the rocker contact letis spring-pressed toward the approaching side of the cam 15 by means et a coil spring l8 which is interposed between socketed extensions 20 and 21 on the rocker M and lever 9 respectively.
ln Fig. 5, the rocker M is mounted upon a reciprocatory plunger 9 carrying at its upper end a tappet screw 8 and lock nut 10 and is preferably hollow or chambered for receiving a longitudinally movable presser foot 22 and coil spring Q3- rl`hi's presser toot 22 is movable longitudinally in the chambered member 9 but is normally spring-pressed outwardly by the spring 23 against the toe of the rocking contact M for the same purpose as the springs l8 and 18 previously described that is, to take up any lost motion in the connections between the valve and cam shaft, thus reducing to a minimum the liability of excessive noise incidehtal to such lost motion.
lt might be stated here that this lost motion is frequently the result of improper adjustment of the tappet screws, or it sometimes happens that the adjustment may be made substantially perfect when the engine is cold, and that the lost motion and consequent pounding or noise will develop as the engine becomes heated, or vice versa, and one of the objects of my invention is to avoid the necessity for such close adjustments, and
at the same time to compensate tor expansion and contraction ot any or all of the connections between the cam shaft and valve under vanving temperatures ot the engine.
As shown in Fig. a tappet bur --Ql-- is interposed between the tappet screw l-- and oneI end ot a lever 2:1 which is centrally tulcrumcd at Yf.($ upon a portion ol the engine and has its other end adapted to engage the adjacent end ot' the valve stem l for opci'iing the valve against the action ot' its rctracting spring` 7 ln Fig, (i, the rocher l4 is `shown as pivotally mounted upon the collar on the valve stein -l for engagement with the surface ol its cam --l.3
The toe of the rocker lt is yieldingly forced toward the approaching side ot the high point ot the cani l5- by means ot a rod 2T which is guided in a suitable way 28 in the collar (5 and is provided at its upper end with a forked head M adapted to interengage with the adjacent side of one ot' the coin'olutions of the spring 7 the'head Q5) being adjustable on the rod 27 to bring about the desired tension on the toc of the rocker lt lt will be noted that in each ol the several modifications; the toe ot' the rocltcr l-l is spring-pressed against the periphery ol the cani .l5 at the 'saine side ot a direct line between the axis ot' the cam shaft and that ot the rocker, and while this pressure is considerably lighter than that produced by the main valve-operating spring, it nevertheless is of sulticient tension to yieldiiigly hold all separable parts of the connections, as for example between the tappet screws and valve stems7 in close contact. under varying teniperature conditions, but does not have any direct influence in either closing or opening the valve. For example, as best illustrated in Fig'. i5, it will be seen that `the spring 23 tends to distend the telescoping parts Q and 22 that is it tends to force the plunger Q with its tappet screw 8 uiwardly, and at the same time to force tie inner part 2 downwardly into contact with the toe ot the rocker llto yieldingly hold the latter in contact with the face of the cam l5 hThis means with the tappet screw S- is yieldingly held in contact with the lower end of the aart 22B- which in turn is yieldingly he d in contact with the adjacent arm of the lever 25 the opposite arm of said lever being yieldingly held by the same spring in contact with the stem ot the valve 1 tending to open said valve, but resisted by the main valve-controlling springV which is of considerably greater tension than the rocker-operating spring 23 It is now clear that while the valve 1 may be closed by the spring 7 the spring llli Zilli Btl maretti -23- lteeps the entire chain ot connections between the cani shaft and valve in yieldingl Contact without in any way interfering with the positive opening and closing of the valve, all of which contributes materially to the noiseless peration of the valve operating mechani i; reduces the Wear of those parts, including the valve, and at the same time increases the power eiiciency ot the engine.
Furthermore, it will be noted that atthe beginningr of operation ot' the cam upon the rockingl member 14` to operate the valve -1-, the point ot contact will be some distance to one side of a. direct line between the axes of the cam shaft and rocker toward the toc ot' said rocker, thereby exerting" an initial I'ircssurc and movement of the member -22- against the action of the spring' -23-, and at the same time tensioning all of the connections between the rocker and. valve ready to receive the positive thrust of the point of the cam against the rocker in the direct line between said axes, whereupon vmotion is transmitted directly from said cam to the plunger -9-, and thence through the remaining connections to the valve to cause a positive openingl or the latter against the action of its retracting spring -7-.
ln reverse. manner, as the point of the cani leaves the center of Contact of the rocker and travels toward the heel of 'the rocker, it will gradually ease oft' the closing ot the valve by its spring -7- instead of allowing it to close with a sudden impact.
What l claim is:
l. ln combination with the cam shaft and Yalve of an internal combustion engine, a spring for closingthe valve and connections between the cani shait and valve for opening the saine against the action ot said spring, including a reciprocatory support, and a rocker pivotally mounted thereon and springpressed against the face ot' the cam.
2. In combination with the cam shaft and valveof an internal combustion engine, a springl for closing the valve and connections between the cam shaft and valve for opening,r the saine against the action of said spring, including` a reciprocatory support, and a rocker pivotally mounted upon said support to swing about an axis parallel with that ot the cam shat't and having a portion thereof overhang'ing the approaching portion of the cam and spring-pressed into en gagement with said cani.
3. rllhe combination with a cam shaft and a valve ot' an internal combustion engine, and a spring for closing said valve, of a reciprocatory support movable in a line substantially radial to the axis of the earn shaft, means `for transinittingmotion from said support to the valve to open the latter against the action of its retractingspring, a rocker pivotally mounted on said support with its airis in said radial line and parallel with that of the cam shaft, said rocker be ing spring-pressed into Contact with the surface ot' the cam. y v
In witness whereof li have hereunto set my hand this th day of March, i918.
VVILLAM M. GODVWN. Witness:
H. i3. CHASE.