US1885273A - Piston ring - Google Patents

Description

NOV. 1, 1932. MALPAS 1,885,273

PISTON RING Filed May 25. 1931 9 \now or Patented Nov. 1, 1932 UNITED STATES fznarjaufr LCi-E ELLIS G. MALPAS, OF MUSKEGON, MICHIGAN; ASSIG'IQ OR TO THE 'PISTON RING, COMPANY,

OF MUSKEGON, MICHIGAN, .A CORPORATIGNOF MICHIGAN PISTON RING This invention relates to piston rings.

It is common in piston rings to provide the same with either a continuous groove, or with a series of grooves or chambers spaced avery short distance and separated by narrow bridges from each other at their ends around the ring. In either case at the parting in the ring, the ends of the ring are grooves leaving very thin or narrow outstanding lips or flanges which; at the extreme ends of the ring at the parting, are to a large extent unsupported and are very liable to chip 011 or otherwise become broken in assembling or in service in an engine. The braking of small particles of iron from the thin outwardly extending flanges above and below the grooved parting ends of the rings is very undesirable, both from the standpoint of loss of efficiency in the ring, from possible scoring of cylinders, or the eventually carrying of chipped or broken particles of iron to the crank case of the engine where the same mingle with the oil and may be carried or splashed to bearings with a resultant detriment thereto.

The present invention has for its object and purpose the construction of a piston ring for obviating such weakening of the flanges produced by deeply grooving the ring to its ends at the parting thereby providing a construction wherein the flanges are made very much less in depth with consequent insurance against breaking or chipping of the same.

The invention may be understood from the following description, taken in connection with the accompanying drawing, in which.

Fig. 1 is a plan view illustrating a grooved ring equipped with my invention.

Fig. 2 is a fragmentary enlarged plan view of the parting ends of a ring, with parts thereof shown in section to better illustrate the invention.

Fig. 3 is a fragmentary elevation of the two portions of the ring, one at each side of the parting, as shown in Fig. 2, and

Fig. 4 is a view similar to Fig. 3 showing the invention applied to a ring in which the groove around the outer side of the same is not continuous but comprises a series of the I grooves around the ring which are separated from: each other at their ends I short -distances. 1 1

Like reference characters referto like parts 7 in the different figures of the drawing.

'The ring 1 isa single piece ring havinga parting '2 at one-side'as is usual in piston rings v and in theform of'ring shown in Figs. 1 to 3 inclusive, a contmuous groove 3 1s cutln the outercurved side of the ring arid from 1 the bottom of this groove at spaced apart intervals drainage slots .4 'for oilare sawed through to the inner curved sideof the ring, the'ends of' said slots being separated by interv'ening posts 5 integral with the' body of thering. I e a It is evident that with the groove 3-c0n tinued its full depth to the ends of the ring at the; partingfth'e upper; and lower flanges which are left above aridbelow the-groove are thin, particularly in the narrowwidthrings almost universally used in internal combustion engines; s'aidflanges bemg unsupported at their free ends; and the same are very :prone' to'chip off,= crystalizeand break, or otherwise become disrupted.

In my invention in the' lformof the ring shown in Figs. l-to 3 inclusive "the endsof the groove 3ad'jacent eachen'd of the ring, at the parting 2, are not continuedthe full depth of the groove, but'terminate a; short distanceffrom each end of the ring' at the parting and outwardly extending humps or bosses 6 at each-side of the parting inthe groovefi are left providing much shallower grooves 7 between the outersides of said bosses 6 and the outer edges ofthe flanges which; are left when the groove-is cut. The flanges at each'side of the -much shallower short groove portions '7 in this manner are not weakened to any detrimental extent-and and do not crystallize or otherwise-break or shatter in assembly or in'--service, while at the same timethe collectionofoil at the partingof the ringin the groove around the-ring is not diminished to any detrimental degree.

The invention is applicable to-other types of flringsflthan grings ihaving a continuous groove. For instance,--as shown in Fig. 4,

the ring 100 having a parting 2a, is not grooved continuously around its entire outer surface but sections or lengths of grooves 8 are made in the outer surface of the ring, separated at their adjacent ends by intervening narrow spaced sections or bridges 9 which form part of the outer curved side of the ring. Drainage slots 10 are cut from the bottoms of the groove sections 8 through to the interior of the ring.

At the parting in'the ring, however, at each side thereof, a like boss or hump 6a is left in the ring so as to provide a shallow rather than a deep groove cut at the parting, for when the groove is deep as has been heretofore made, it leaves narrow relatively deep and comparatively fragile flange ends subject to breaking, crystalizing and the like.

The type of ring shown in Fig. 4, to which my invention is shown applied is like that illustrated in my pending application Ser. No. 482,390, filed September 17th, 1930, and in the present application, I have applied thereto the integral raised reinforcing bosses 6a at the parting for the purposes which have been described and set forth. This invention .is very practical and serviceable and of value in connection with piston rings which are grooved across the parting ends thereof.

The invention is defined in the appended claims and is to be considered comprehensive of all forms of structure coming within their scope.

I claim:

1. A piston ring of substantially circular form, having a parting at one side and grooved between its parallel fiat sides and at its outer surface at and for a distance to each side of the parting, said groove directly at and a short distance to each side of the partingbeing shallow and then deeper, there being integral outwardly projecting portions of the piston ring at each side of said parting providing the bottom of the shallow portions of the groove and ends of the adjacent deeper portions thereof.

2. A piston ringhaving, a parting in a side thereof and formed with a series of con secutive groove sections around the ring away from said parting the adjacent ends of said groove sections running out to the outer curved surface of the ring and being spaced from each other by short lengths of said outer surface of the ring, and bosses integral with the ring at each side of the parting projecting into the adjacent groove sections to within a short distance of the outer surface of the ring, as specified.

3. A construction containing the elements in combination defined in claim 2 combined with passages extending through the ring from the bottoms of said groove sections to the inner surface of the ring.

In testimony whereof I affix my signature.

ELLIS G. MALPAS.

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