US3155394A

US3155394A - Scraper segments

Info

Publication number: US3155394A
Application number: US104139A
Authority: US
Inventors: Barbero Fermo
Original assignee: Individual
Current assignee: Individual
Priority date: 1960-04-21
Filing date: 1961-04-19
Publication date: 1964-11-03
Anticipated expiration: 1981-11-03

Description

Nov 3, 1964 F. BARBERO SCRAPER smumms Filed April 19. 1961 I N VEN TO R H R/v0 BHRBERO United States Patent 3,155,394 SCRAPER SEGMENTS Fermo Barbero, 25 Rue dltalie, Marseille, France Filed Apr. 19, 1961, Ser. No. 104,139 Claims priority, application France Apr. 21, 1960 Claims. (Cl. 277141) The object of the invention is to provide a composite piston ring which not only ensures fluid-tightness but also cleans the sliding surfaces of the cylinder and evacuates the films removed from the surfaces.

It is characterised by the means used, considered both in conjunction with one another and independently of one another, and more particularly by a ring with an oblique vertical face set back between an upper and a lower shoulder, constituting a peripheral groove. On each side of this ring are disposed thin scraper elements which pro ject to a small distance, in such a way as to provide with the ring three scrapers for contact on the cylinder. The oblique vertical face thus forms a central external peripheral groove.

On the attached drawings, illustrating by way of an example, and without any limitative elfect, one possible constructional version of the invention:

FIGS. 1 and 2 are a plan view and a side view of the ring proper;

FIG. 3 is a cross section through the same device;

FIGS. 4 and 5 illustrate the elastic scraper members;

FIG. 6 is a schematic cross section of the elements of which the ring consists.

The ring in FIGS. 1 and 2 consists of a metal hoop on the lower and upper faces of which are vertically rigid overlapping pr-

otuberances

18 and 19, with

recesses

18 and 19 these protuberances being set back horizontally in order to provide the

spaces

20, 21.

The vertical wall is rectilinear on the inside, as shown at 22, and oblique on the outside, as shown at 23.

The

elastic scraper members

24 and 25, in FIG. 6, are situated on the shoulders, and their

external edges

26 and 27 project by the same distance as the point 23 of the oblique side, so that they are situated in the projection of the axis XY, representing the wall of the cylinder.

A mounting 28, which functions as a spring, is polygonal in section and has cut-out

parts

29 and 30 to ensure elasticity, comes to bear against the internal vertical face 22, and forces it outwards to enable it to fit tightly against the cylinder.

The ring proper only has one scraper-edge 23. This edge is situated between the other two

elastic scraper members

26 and 27, which are spaced out and which act on the lower and upper faces.

These three sliding joints increase the hermeticity of the ring, and the

grooves

20 and 21, with their

orifices

18 and 19 enable the waste matter to be removed and collected.

The elastic packing 28 adds to the thrust of the ring that of its

recesses

29 and 30, in addition to its own bending, so that this triple elasticity absorbs the expansionand contraction-effects and thus assists in ensuring the complete fluid-tightness of the ring, whether cold or hot.

Finally, the scraper edges situated on different planes and mutually independent, although constituting a homogeneous unit, without any discontinuity, ensure maximum strength combined with maximum efficiency.

The forms, dimensions and arrangements of the various elements may nevertheless vary within the limits allowed by equivalent devices, as may also the materials used for their manufacture, without thereby departing from the general principle of the invention described in the foregoing.

I claim:

1. A composite cylinder and piston ring assembly com prising a cylinder wall, a first central ring provided with circumerential staggered upper and lower set back shoulders for the collection of oil and a vertically oblique face terminating in a scraper edge, a resilient member urging said central ring scraper edge outward against said cylinder wall, and second and third elastic scraper members disposed respectively above and below said shoulders in scraping engagement with said cylinder wall, whereby three mutually independent scraper elements in vertical array successively engage the cylinder wall and are sepparated from each other by two oil grooves formed as shoulder recesses set back from the oblique face of said central ring.

2. An assembly as claimed in claim 1 in which the resilent member for urging the central ring outward comprises a split polygonal spring.

References Cited in the file of this patent UNITED STATES PATENTS

Claims

1. A COMPOSITE CYLINDER AND PISTON RING ASSEMBLY COMPRISING A CYLINDER WALL, A FIRST CENTRAL RING PROVIDED WITH CIRCUMERENTIAL STAGGERED UPPER AND LOWER SET BACK SHOULDERS FOR THE COLLECTION OF OIL AND A VERTICALLY OBLIQUE FACE TERMINATING IN A SCRAPER EDGE, A RESILIENT MEMBER URGING SAID CENTRAL RING SCRAPER EDGE OUTWARD AGAINST SAID CYLINDER WALL, AND SECOND AND THIRD ELASTIC SCRAPER MEMBERS DISPOSED RESPECTIVELY ABOVE AND BELOW SAID SHOULDERS IN SCRAPING ENGAGEMENT WITH SAID CYLINDER WALL, WHEREBY THREE MUTUALLY INDEPENDENT SCRAPER ELEMENTS IN VERTICAL ARRAY SUCCESSIVELY ENGAGE THE CYLINDER WALL AND ARE SEPPARATED FROM EACH OTHER BY TWO OIL GROOVES FORMED AS SHOULDER RECESSES SET BACK FROM THE OBLIQUE FACE OF SAID CENTRAL RING.