US1100912A - Valve-actuating device for internal-combustion engines. - Google Patents

Description

G. R. R1011.

VALVE AGTUATING DEVICE FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED JULY 19, 1913.

Patented June 23, 1914;

UNITED STATES PATENT- OFFICE.

GEORGE E. .RICH, 0F OAK PARK, ILLINOIS, ASSIGNOR TO HIGH TOOL COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

Specification of Letters Patent.

Patented June 23, 1914.

Application filed July 19, 1913. Serial N 0. 779,998.

To all whom it may concern Be it known that I, GEORGE R. RICH, a citizen of the United States, and a resident of Oak Park, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Valve-Actuating Devices for Internal-Combustion Engines, of which the following is declared to be a full, clear, and exact description.

This invention relates to puppet valves for internal combustion engines and its principal object is to provide means. for minimizing the noise, shock, wear and tear upon the valve-stems and push rods of internal combustion engines, caused by the striking of the push rod against the valve stem during the strokes which unseat the valve. It is the common practice in valve mechanism of this class, to leave a slight space between the adjacent ends of the valve stem and push rod, in order to relieve the push rod and cam from the pressure of the spring (which seats the valve) during the intervals that the valve remains seated.' It is obvious that the push rod strikes against the end of the valve stem with great frequency while the engine is running; that more or less wear upon the adjacent ends thereof is caused as a result of such frequent blows, and'that considerable noise results from the repeated blows of the push rod upon the end of the valve stem.

The present invention is designed to eliminate the noise and shock, and with these objects in view, the invention consists in providing cushioning means between adjacent ends of the valve stem and push rod adapted to absorb the shocks. It further consists in the several novel features hereinafter clearly set forth and par-.

ticularly defined in the claims.

The invention is clearly illustrated in the drawing furnished herewith, in which:

Figure 1, is a view partly in side elevation and partly in central vertical section of a fragment of a puppet valve mechanism containing the preferred embodiment of the present invention, Fig. 2, is a plan of the cushioning element, and Fig. 3, is a vertical cross section taken on the line 3-3, of Fig. 2.

I have illustrated the present invention in connection with a fragment of an internal combustion engine, in which A, designates one of the ports thereof, leading to the cylinder, and B, designates a guide for guiding the push rod D. The cam shaft C, may be of the usual kind employed in internal combustion engines, and said cam shaft carries cams, one of which is seen at c, for recipro eating the'push rod D, of the valve mechanism. The valve E, is of the ordinary puppet form, having a valve head or disk e, and a valve stem e The head or disk 6, of thepuppet valve seats upon the seat a, and a coil compression spring F, interposed between the wall a of the engine, and a washer f, secured upon the valve stem near its lower end, operates to seat the valve E. It frequently happens that the distance between the valve stem and cam shaft varies a trifle, as a result of the finishing and truing up of the parts; for this reason it is preferred to provide means for lengthening or shortening the push rod D, and the latter is shown as comprising two members D D which are adjustable lengthwise of each other so as to vary the distance between the ends thereof. As here shown, the member D is in the form of a screw, having a threaded stem (Z threaded in a tapped hole 03 in the upper end of the member D andhaving a many sided'head d, at its upper end. A set nut 03 is threaded upon the stem of the member D andbears against the upper end of the member D to lock the two members D and D together.

The push rod D, is shown as formed with a shallow recess d, in its upper end and the bottom of said recess and lowerend of the valve stemare spaced apart to permit of the reception of the cushioning means, here shown as comprising dished disk G, whose peripheral edge 9, rests upon the bottom of recess d, and holds its upper convex face in engagement with the lower end of the valve stem. Notches 9 may be formed in the marginal edge of the disk G, to render it more elastic, although saidnotches may be wholly dispensed with if so desired. The disk G, is preferably constructed of spring steel, so as to afford the greatest amount of resiliency. The push rod D, is shown as formed with a central cavity 03 which leads down from the recess (1, and said cavity may be filled with an oil H, or other lubricating material; in fact the entire recess and cavity may be filled with oil if so desired. The

distance between the end of the valve stem and bottom of the recess d, may be regulated by turning the member D of the push rod in the proper direction and tightening up the nut d; the member D should be so adjusted with respect to the end of valve stem that the disk G, is held under slight pressure, between the stem and push rod when the valve is seated and thepush rod is in engagement with the concentric portion 0 of the cam c. As the high point 0 of the cam raises the push rod D, the first ac 'tion of said push rod is to straighten out or used in the cavity d the noise will be practically eliminated.

It will be perfectly obvious that when the concentric portion of the cam is traveling against the end of the push rod, the spring F, holds the valve upon its seat, and yet, be cause of the cushioning means between the valve stem and push rod, the latter is held in contact with the cam, but the possibility of shocks and jars between the adjacent ends of the valve stem and push rod is wholly eliminated by reason of the cushioning means which are interposed therebetween.

I realize that various alterations and modifications of the exact form of construction are possible withoutdeparting from the a reciprocatory push rod, of

spirit of this invention and I do not therefore desire to limit myself to said exact construction.

I claim as new and ters Patent:

1. The combination with a puppet valve, its stem, a spring for seating said valve and a reciprocatory push rod, of a dished disk interposed immediately between the adjacent ends of said valve stem and push rod and in constant contact with the adjacent ends of the valve stem and push rod.

2. The combination with a puppet valve, its stem, a spring for seating said valve and a dished resilient disk, interposed immediately between the adjacent ends of said valve stem and push rod and in constant contact with the adjacent ends of said valve stem and push rod, said disk having one or more notches formed in its marginal edge.

3. The combination with a puppet valve, its stem, a spring for seating said valve and a reciprocatory push rod having a recess in its end adapted for the reception of the end of said valve stem, of a resilient dished disk between the endof the valve stem and botdesire to secure by Lettom of the recess and in constant contact with the adjacent end of the valve stem and bottom of the recess.

4:. The combination with a puppet valve, its stem, a spring for seating said valve and a cam actuated push rod, one end of which is located adjacent to the end of the valve stem, said push rod having a recess in said end for the reception of the end of the valve stem and having a cavity below said recess for the reception of oil, of a resilient dished disk lying on the bottom of said recess and engaging directly with the adjacent end of the valve stem. I

5. The combination of a puppet valve, its stem, a spring for seating the valve, a cam shaft and cam thereon, a push rod between the valve stem and cam, said push rod comprising two members, longitudinally adjustable with respect to each other and a dished disk interposed directly between the end of the valve stem and adjacent member of the push rod and in constant contact with the adjacent ends of the said stem and push rod.

6. The combination of a puppet valve, its stem, a spring for seating the valve, a cam shaft and cam thereon, a push rod between the valve stem and cam, said push rod comprising two members, longitudinally adjustable with respect to each other, one of said members having a recess and cavity at the end adjacent the valve stem adapted for the reception of oil, and a dished disk interposed directly between the valve stem and bottom of said recess and in constant contact with the adjacent end of said valve stem and bottom of recess.

7 The combination of a puppet valve, its stem, a spring for seating the valve, a cam shaft and cam thereon, a push rod between the valve stem and cam, said push rod comprising a member bearing against said cam, and a second member having a screw threaded stem threaded in one end of said first named member and a head adjacent the valve stem and formed with a recess in its end, and a dished disk interposed directly between the adjacent ends of the valve stem and recessed member of the push rod and in constant contact with the adjacent end of the valve stem and bottom of the recess of the push rod.

In testimony whereof I have hereunto executed the above instrument at Chicago, county of Cook, State of Illinois, this 15th day of July A. D. 1913.

GEORGE R. RICH.

Witnesses E. MULLIGAN, C. E. MCBRIDE.

Images