US1414747A - Piston or compression ring - Google Patents

Description

F. MUELLER.

PISTON 0R COMPRESSION RING. APPLICATION FILED MAR-20.1919.

g'% 7' i 53, mum ,L x x: mum! PISTON 0R COMPRESSION RING.

Specification of Letters Patent.

Patented May 2, 1922.,

Application filed March 20, 1919. Serial I t'o. 283,847. 1

T 0 all whom it may concern:

Be it known that I, FREDERICK MUELLER, acitizen of the United States, residing at Irvington, in the county of Essex and State of New Jersey, have im'ented certain new and useful Improvements in Piston or Compression Rings; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to characters of reference marked thereon, which form a part of this specification.

This invention relates, generally, to improvements in piston-rings; and, the present invention has reference, more particularly, to a novel construction of piston-ring adapted for use with engines of the various kinds, and especially with internal explosive or combustion engines, such as are used with antomobiles.

My present invention, therefore, has for its principal object to provide a novel and simply constructed piston-ring of the general character hereinafter set forth, with a View of providing a piston-ring which can be readily slipped over the end of the piston, without straining or distorting the perfect annulus and outer fitting surface of the ring, the ring thus being adapted to maintain at all times a snug and evenly wearing connec-' tion between the piston and cylinder-wall.

Because of the shape of the interior surface of the annulus, providing practically a re-inforced ring although made in one piece, the ring will not be strained or will not break in placing itin position upon the piston. will produce a perfect fit throughout its outer contacting surfaceportions, thus economizing in the consumption of the explosive fuel, and at the same time will prevent the contacting surface of the ring from becoming pitted or set with carbon.

Other objects of the present invention not at this time more particularly enumerated will be clearly understood from the following detailed description of the present invention.

With the above-stated objects in view, the present invention consists, primarily,-in the novel piston-ring of the general character and construction hereinafter more fully set,

forth.

The invention is clearly illustrated in the accompanying drawings, in which Figure l is a plan View of a completed piston-ring made according to and embodying the principles of the present invention; Figure 2 is an elevation of the same; and Figure 3 is a transverse vertical section of said piston-ring.

Figure 4 is an enlarged detail vertical section of a portion of the said ring, said view illustrating moreclearly, one manner of providin the interior surface of the ring with a mu tiplicity of alternating annular ribs or raisedportions and annular grooves or depressed portions.

Figure 5 is a vertical sectional representation of a piece of tubing, illustratlng the various steps of the method for producing indicate corresponding parts.

Referring now more particularly to Figures 1, 2, 3 and 4 of the drawings, the reference-numeral 1 indicates the complete pistonring, the ring in the present case consisting of a single annulus, having a joint formed by the two interlocking projecting end-portions or tongues '2 and 3, as shown in Figure 2 of the drawings. In practice, I prefer to make the interlocking projecting end-portions at their respective abutting surface -portions, when the ring is entirely closed, with convexly-formed and concavely-formed cornerportions, as 4 and 5, adapted to be brought into registration with each other, as shown in said Figure 2, whereby the danger of the breaking away or cracking of the said tongues due to crystallization or otherwise. as is so often the case where sharp corners are employed, is substantially overcome. As

shown more particularly in the drawings, the outer surface-portion 6 of the ring is a true cylinder, or when "iewed as shown in Figure 1, a true circle. The opposite sides or planes '7 and 8 of the annulus are straight, and the grooves ordepressions 10.

, according to the principles ofwithin the tubing, these parts are highly mg for the cross-section, as will be clearly evident from an inspection of Figures 3 and at of the drawings.

ltllaving in the foregoing described the general construction ofv piston-ring made the present invention, ll will nowbriefiy set forth the preferred method of producing the same.

Referring now to Figure 5 of the draw ings, the reference-character 11, indicates a suitable length of tubing, preferably provided at one end with a flange, as 12, for securing thesame in position at said end of the tubing to the head or chuck of a lathe.

The'normal thickness of the wall-portions of this tubing is indicated by the longitudinally extending dotted lines 13 -13 in said Figure 5. By means of the proper cutting tool, the inner'surface of the said tubing is cutaway so as to provide said surface with a multiplicity of alternating annular ribs or raised portions It and annular grooves or depressions 15 corresponding in configuration to the above mentioned annular ribs or raised portions 9 and annular After these ribs or raised portions 14 and grooves on depressions 15 have been formed polished,and then a rolling tool is inserted 1n the grooves," and'with the properapplication of pressure, the channelled portions andiuniform' cylindrical surfaoe to. provide rings'of the desired size. .This turned down l surface is next carefully polished, and the rings are thereupon removed from the arbor. Each ring is next placed in a milling ma Leia-re? chine andby-means of the proper milling tool the ring is milled across its width to provide a split ring having previously mentioned interlocking end-portions or tongues 2 and 3] Afterthe split ring has been, in the above manner, finally completed, owing to the inner rounded marginal edge-portions it can be easily slipped over the end of the piston, and sprung into its packing position in the usual annular groove with which the piston is provided' Clhe above-stated rolling operation has produced thev ring with great resilient properties, so that the rin accurately engages the inner wall of t e cylinder peripherally at all points. The perfect cylindrical contact insures a uniform wear of the ring at all points, so that perfect com pression is the constant result, any leakage of the motive fluidfrom the one end of the piston in that portion of the cylinder in which it is required to the opposite end of the piston being obviated. H

' ll claim I 1. A piston-ring comprising a single split annulus having a true outer cylindrical and I smooth" contacting surface and straight sides, the inner annular surface-portion be- "ing provided with a series of annular ribs of convex cross-section and an intermediate annular depression throughout of greater 7 density than said contacting surface.

2. A piston-ring comprising a singlesplit annulus having a true outer cylindrical and smooth contacting surface and straight sides,.the inner annular surface-portion be ing provided with a multiplicity of alternatingannular ribs of convex cross-section and annular depressions of concave cross-sea tlon throughout of contacting surface.

greater density than said In testimony that l claim the invention set forth above l have hereunto set my hand this 17th dayof March, 1919. I

' FREDERICK MUELLER.

Witnessesf l nnon C. Fnann'rznn, Bantam Snr'rnunm.

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