US 1769375 A
Description (OCR text may contain errors)
July l, 1930. J. c. L ARY a PISTON GUIDING MEANS- Filed Dec. 17, 1923 2 Sheets-Sheet 1 III, l-IIIII V INVENTOR. JCZIHRK;
July l, 1930. y
2 Sheets-Sheet 2 I J. LEARYV PISTON` GUIDING MEANS INVENTOR. J C'. &mn
&gd/104105) ATTORNEY Patented July 1930 WWASTA S.
;PATNT ow-;e V
JOHN c. LEA Y; Q sANFRAncIsco, CALFO IA PISON-GUIDINGMEANS.
Application filed ,December 17, 1923. i Serial No. 6315179.
My invention relatesto aimeans' for'preventing pston slap in an internal combustion engine i particularly i during the power stroke.
An object of the invention is to provide an internal combustion engine in which a pisten and crank are directly connected by a c0n-'` necting rod, with means incorporated with the pisten and cooperating'with means provided in the crank case tor preventing rocking of the piston and the attendant deletei rious effects.
the foregoing, will be set Orth in the follow-' ing description of the preferred form of my invention which is illustrated in the drawingsaccompanying and forming part of the specfication. It is to beunderstood that I do not limit myself to the showing made by the said drawings and description, as I may adopt variations of the preferred form with-' in the scope of my invention as set forth'in the claims.
Referring to said drawings:
Figure `l is a longitudinal sectional view ot' an engine equipped with the means of my invention. r
Fgure 2 is a View similar to. that of Figure l showing a modified form of the means.
As is well known, the pisten and cylinder of an internal combustion engine of the usual type are subjected to considerable frictional wear on one sidedue to the rocking of the pisten during the explosion stroke. This 5 rocking is due to the fact that the connecting rod is angularly disposed with respect to the axis of the cylinder during the working' stroke, and, theretore, eXerts a transversely acting thrust against the cylinder wall through the piston at the side away from 'to move in the proper path even though the .s
which the connecting rod moves during the i first half ofsaid Stroka Many attempts r have here'tofore heenmade to remedy this objectionable feature, but the majority of such attempts, in accompl ishing thedesire d end, 5 have more or less impaired the' efiiciency of the enginef In accordance,-however, with my inventionthe objectionable side. play of the pisten isnot only elninated but theoper atingefliciency of the engine is fully preserved. a p V Briefiy expressed, themeansofmy invention in the preferred emloodiment comprises a pisten having incorporated therewith a ri-gid .yoke` which 'extends' longitudinally si', a
thereof and encirclesthe connecting rod and crankf pin. Cooperating guide members` are provided on the yoke and crank case which q serve to guide the yoke for movement parallel to theaXis of the cylinder during' the reciprocation of the piston and thereby prevent rocking of the pisten; 'Means are a lso pro- Vided 'or supplementing the' guiding action of: theguide members and causing the. piston side of'the pisten and cylinder have become i 'A detailed description follows 1- i As hereinbefore stated the means of my invention is adapted. for use? in connection with .an internal combustion engine in whichthe crank andpiston are directly connected by. a oonnecting rod, Accordingly, in the drawings'theengine 4 is provided with a piston 5 which is mounted 'tor reciprocation in a cylinder 6-and is operatively connected to 'the crank shaft 7 by means ofaconnecting red 8 andcrank 9. w a Rigidlyjfix lto the pistOIl,-Qf which it is virtually a part, by means of bolts 12 Or theffl :likeand extendingintothecranlrcase 13 is ayokeor strap let 'prefrably of segmental crosssection. Theyoke 14, together .with the pisten properextends completely 'around thec'onnectingrod including the wrist pin 16 andcrankpin 1.7, and defines. a plane paral-' l'el .to the ;plane-of motion ofthe connecting rod. Due to the position of the yoke relative to the connecting rod, the formeris .of such shape as to not interf ere with the oscillation '21 oI" the connecting rod. Fixed to the yoke, preferably at a point longitudinally aligned with the cyIinder, which point is preferably most remote from the piston proper, is an extension 18 which is in slidable engagement with a guideway 19 formed in the wall 21 of the crank-case 13. As here shown, the extension 18 is in the form of a cylndrical rod 22 which moves ina direction parallel to the aXis of the cylinder 'and reciprocates in the cylindrical bore 23013 'the uideway" 19.' i It will thus be noted that the portion of the piston engaging the 'walls of the cylinder will be prevented from moving in any direction other than axially of the cylinder. Thus rocking of the piston is absolutely prevented.
The piston proper is provided with cored walls, so that the combined weight of the piston including the yoke portion is no more than the weight of the usual piston, and since the side thrust of the piston is distributed so that the unit pressure on the bearing surfaces involved is reduced to a minimum, 'wear of the 'parts will be correspondingly reduced and the efiiciency of the engine will be preserved. e i
Adjustably positioned in the crank case is a roller '31 which is adapt'ed to bear against the side 32 of the piston from which the connecting rod moves during the first part of the-working stroke. 'In this manner, if the side 32 of the piston or the cylinder wall portion 33 engaged thereby becomes worn the roller may be adjusted to cooperate with the guide members 18 and 19 to hold the piston to its proper path. i V
-In Figure 2, a slightly 'modified form of guiding means is shown; In this 'embodie ment, extensions 34: at opposite sides of the re'ciprocation therein; a connecting rod at one end of the piston; said piston being reduced in cross sectional area adjacent said rod whereby such reduced piston will be kept spaced from the walls of the cylinder when disposed therein; a yoke member rigidfly fixed at an end to, and forming an extension of, the piston and disposed about said rod:
'means adj acent the other end of said yoke for yoke are formed with hearing faces 36 which 4 are arranged to engage hearing surfaces 37 provided on the adjacent sides of the crank case.
I clam: i 1. In an internal combuston engine, the
combination with a piston mounted for recipton at the side away from which the connecti i ing rod swings during the first part of the power stroke. p
2. In a piston guiding means, the combination with a cylinder, a piston mounted .for recprocaton theren and a connecting rod at one end of the piston; said piston being reduced m'cross sectonal area adjacent said rod: Whereby ch reduced portion will'be I\ kept spaced from the walls of the cylinder U i 'when disposed therein, and an adjustable non-frcton hearing member arranged to engage said reduced portion of the piston during the reciprocation thereof.
3. In piston guidng means; the combination with a cylinder; a piston' nountedtor