US2001119A - Piston ring - Google Patents

Description

ZMQLMQ May M, 1935.. Y H. F. BEDWELL PISTON RING Filed Feb. 16, 1954 Patented May 14, 1935 PISTON RING Harry Francis Bedwell, Lyons, Ind. Application February 16, 1934, Serial No. 711,582

1 Claim.

This invention relates to an oil ring for use in connection with the piston of an internal combustion engine. It is an object of the invention to provide a ring with a single scraping edge which will remain constantly in contact with the cylinder wall so as to insure eflicient scraping of the lubricant therefrom.

A further object is to provide a ring of this character which will not choke with carbon and which has means whereby the oil accumulated by the ring can be returned freely into the piston so that all carbon and other foreign accumulations will flow from the outer surface of the ring without danger of choking the ring and interfering with the return of the oil to the crank case.

A still further object is to provide an oil ring the use of which will result in a considerable saving of lubricant.

With the foregoing and other objects in View which will appear as the description proceeds, the invention consists of certain novel details of construction and combinations of parts hereinafter more fully described and pointed out in the claim. In-the accompanying drawing the preferred form of the invention has been shown.

In said drawing:

Figure 1 is a transverse section through a portion of an engine cylinder and the piston therein, said piston being equipped with an oil ring such as constitutes the present invention, the ring being partly in section and partly in plan.

Figure 2 is a view partly in side elevation and partly in section of the oil ring.

Figure 3 is an enlarged. section on line 3-3, Figure 1.

Figure 4 is an enlarged section Figure 1.

Referring to the figures by characters of reference A designates the cylinder of an internal combustion engine in which is mounted a reciprocating piston 3 provided with the usual oil groove C extending therearound. This groove is of uniform width and depth and has a plurality'of closely arranged drain openings D leading therefrom to the interior of the piston.

The ring constituting the present invention has been indicated at I and is formed of resilient metal with its ends 2 adapted to lie close together when the ring is seated in the groove C. The other side of the ring is cut away to form an annular rabbet 3 open at the bottom. The upper wall of this rabbet is inclined downwardly and on line 4-4,

outwardly-as indicated at 4 and terminates in a scraping edge 5 for contact with the surface-of cylinder A.

Extending longitudinally of the rabbet 3 and opening thereinto at the center of the ring are drain slots 6. The end walls of these slots diverge inward toward the piston. Thus it is possible to arrange the slots close together and at the same time have their inner or outlet sides of such length as to communicate at one time with the maximum number of drain openings D. This will be apparent by referring to Figure l.

The back wall of the rabbet 3 is inclined downwardly and outwardly from the inner end of wall 4 to the slots 6 and, if .desired, a shallow channel 8 can be formed in the outer surface of the ring between and in line with the slots 6.

In practice the scraping edge 5 will remain constantly in contact withthe surface of the cylinder, itstendency to hug said surface being due to the fact that only one scraping edge is provided. Consequently there is no tendency of this scraping edge 5 toswing away from the wall as would be the case should another scraping edge be located adjacent to 'the bottom'of the rmg.

As the piston moves in one direction the edge 5 will scrape the oil from the cylinder wall and deposit it in the rabbet 3. The inclined walls 4 and 1 increase the size of the oil receiving space so that the flow of oil will not be retarded. The flow is also expedited in view of the fact that the slots 6 increase in length toward their inner or outlet sides wherethey are in constant communication with the maximum number of drain openings D.

Because of the free flowing action of the oil from the ring back into the piston due to the ample space provided for its accumulation and for its return .to the piston and thence to the crank case, the oil does not have an opportunity to choke the ring with carbon. Instead any small amounts of carbon which might form will be carried ofi with other impurities and be deposited in the crank case.

As the scraping edge 5 is maintained in constant correct scraping position, the use of this ring will result in a considerable saving of oil which might otherwise be wastedand the saving is further promoted through the free return of the oil to the crank case before it can carbonize.

By providing the channels 8 some of the 'oil flowing downwardly along the wall of the rabbet will be deflected toward the slots 6.

What is claimed is:

from the rabbet, that portion of the wall of the rabbet between the slots and the wall being inclined downwardly and outwardly to provide an oil receiving space of increased area between the slots and the scraping edge, there being channels in those portions of the wall of the rabbet between the slots and terminating at the ends of the slots for trapping oil and deflecting it to the slots.

HARRY FRANCIS BEDW'ELL.

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