DE1079402B - Sealing ring unit for piston - Google Patents

Description

GERMAN

The invention relates to sealing ring units for pistons, consisting of two thin ones Piston rings and one serving to maintain a distance and to expand, im Cross-section U-shaped resilient ring. Such sealing ring units are used, for example, as oil control rings in internal combustion engine pistons application. The flexible expansion and spacer ring presses the thin oil control rings with their circumferential surface against the cylinder wall and with a radial one Face in sealing contact with the corresponding surface of the oil ring groove of the piston.

In a known sealing ring unit of this type, the web part of the resilient U-shaped Spreader and spacer ring and its legs are divided into individual webs in such a way that two each adjacent webs at one end with one of two adjacent leg sections and at the other end are connected to one and the same leg portion. The bars are on the outer circumference of the expansion and spacer ring is provided. Furthermore, such a sealing ring unit became known with a flexible expansion and spacer ring of U-shaped cross-section, in which there are bars on the inner and outer circumference. In a sealing ring unit in which between the two thin oil control rings there is only one used to maintain a distance Ring of U-shaped cross-section is provided, the legs of the U-shaped cross-section protrude forming lobes that keep the rings at a distance from an undivided one on the inner circumference provided web part protrudes, the on the inner circumference of the U-shaped cross-section having Spacer ring is provided.

Of the known sealing ring units with a resilient, U-shaped cross-section Expanding and spacer ring, the web part of which is divided into individual webs, differs from the subject matter of the invention in that the webs, as per se in the undivided web of the rigid spacer ring known on the inner circumference of the expansion and spacer ring and to form shoulders that cooperate with the inner surfaces of the sealing rings, above and below each have a section bent back on itself.

The inventive design is achieved over the known rings that the resilient legs of the ring, the two spreadable rings lying in the annular groove of the piston with their Press the entire width against the sealing surfaces of the ring groove of the piston.

The new expansion and spacer ring can be made from a metal strip that is in its mitt-sealing ring unit for pistons

Applicant:

Thompson Products, Inc.,
Cleveland, Ohio (V. St. A.)

Representative: Dr.-Ing. F. Wuesthoff, Dipl.-Ing. G. Pulse

and Dipl.-Chem. Dr. rer. nat. E. Frhr. v. Pechmaim,

Patent Attorneys, Munich 9, Schweigerstr. 2

Herbert Wallace Cable, Cleveland Heights, Ohio

(V. St. A.),
has been named as the inventor

leren section narrow, elongated and interconnected has aligned, arranged at small mutual intervals transverse slots, so that at the Long edges of the material and narrow margins remain. In addition, the edge strips are on each one second slit center line intersected, in such a way that the one edge strip in each case on one first and a third slot center line is intersected, while the other edge strip, respectively is cut at a second and a fourth slot centerline so that a material results in that it extends continuously along a zigzag path.

The material is then bent in such a way that a cross-sectional shape is in the form of an elongated one U results, with the cut edge strips lying in parallel planes, and then the curved one Part of the U-shaped cross-section flattened to where the legs of the U-shaped cross-section or the edge strips of the material merge into the bent part, bend backwards or outwards. At the same time, the material is shaped into a ring with the flattened base sections of the U-shaped cross-section lie on the inner circumference of the ring, while the slotted or cut through Edge strips or legs are directed radially outward.

This shaping process gives the ring a cross-sectional shape in the shape of the letter π, the outwardly bent portions in Axis direction above or below the upper and

909 7SW291

lower leg sections to form shoulders that can rest against the thin rings and push them outwards at the numerous points of contact.

The invention is explained in more detail using schematic drawings of an exemplary embodiment.

Fig. 1 shows a partial section through a sealing ring unit according to the invention and leaves the arrangement this unit in the oil ring groove of a piston that can be moved back and forth within a cylinder or the like. Recognize;

Fig. 2 shows the packing ring unit in plan, with certain parts broken away to reveal further details;

3 is a perspective view of a piece of an expanding and spacing ring according to the invention;

Fig. 4 shows in plan a piece of a preformed blank from which an inventive Expanding and spacer ring can be produced;

Fig. 5 is a piece of the interior view of an expansion and spacer ring according to the invention;

Fig. 6 shows in cross section different stages of the production of a spreading and according to the invention Spacer ring.

According to the figures, a packing ring assembly 10 according to the invention comprises when it is in the oil ring groove 11 of a piston 12 of an internal combustion engine which can be moved back and forth in a cylinder 13 or the like Od. Like. Is arranged, a resilient expansion and spacer ring 14, which the thin rail-shaped Rings 15 and 16 resiliently against the upper and lower radially extending surfaces 17 and 18 of the Oil ring groove presses in order to bring about an essentially complete seal on these surfaces, and which also presses the thin rings 15 and 16 against the inner surface 19 of the cylinder, to also here to effect a substantially complete seal.

It is true that the packing ring assemblies according to the invention can be combined with any suitable combination Use a piston with a cylinder, but the application here is to the piston and the cylinder an internal combustion engine described; However, this is only an application example, to which no restrictive meaning is assigned. In internal combustion engines, the piston is often provided with oil channels 20, which are a Allow oil to flow out of the oil ring groove.

The thin rail-shaped rings 15 and 16 are preferably made of a resilient material, e.g. B. od spring steel. The like., And they have outer edge portions 21 and 22 which are chrome-plated or otherwise hardened in order to increase their wear resistance. The expandable thin rings 15 and 16 can be chrome-plated at their edge portions 21 and 22 in contact with the cylinder wall or alloyed with chrome in the area of their circumference in such a way that the chrome content of the material changes radially inward so that the parts in contact with the cylinder wall change The expandable rings can initially run in quickly, whereupon the chromium content changes gradually in order to give not only the expandable rings, but also the cylinder wall a longer service life.

In order to allow the thin rings 15 and 16 to adapt to the diameter of the Inner surface 19 of the cylinder 13 to expand and contract as it passes through the expansion and Spacer ring 14 are pressed against the cylinder wall, the rings 15 and 16 according to FIGS. 2 and 5 each provided with a radial gap 23 and 24, respectively. When the diameter of the cylinder increases, the expansion and spacer ring 14 presses radially outward against the rings 15 and 16 in order to spread them open and to place their peripheral surfaces against the cylinder wall so that a substantially complete seal is guaranteed. The fact that through

ίο the column 23 and 24 of the thin rings 15 and 16 one very small amount of oil passes, does not affect the economic operation, and the The amount of oil is so small that it can be used in the system in which the packing ring is installed or in relation to the Packing ring itself does not cause any other harmful effects.

The expanding and spacer ring 14 of the packing ring assembly 10 holds the thin rings 15 and 16 with the radially extending surfaces 17 and 18 of the oil ring groove 11 in contact by pressing its radially extending leg portions 25 and 26 axially against the rings in question. These leg sections 25 and 26 are resiliently connected to the axially extending cross pieces 27, which are connected to the radially extending legs 25 and 26 at the upper and lower ends of the cross pieces by outwardly bent fold sections 28 and 29, as shown in FIG. 1 can be seen. Furthermore, it can be seen in Fig. 1 that the expansion and spacer ring 14 in this construction has a cross-sectional shape similar to the letter π , the ends of the cross pieces 27 each extending axially beyond the planes of the radial legs 25 and 26 . These axial extensions preferably have a length which is slightly less than the thickness of the thin rings 15 and 16 (FIGS. 1 and 5), and they form radial shoulders which resiliently engage the thin rings 15 and 16 and these radially outwards press against the cylinder wall 19.

According to FIG. 3, which shows the structure of the expansion and spacer ring 14, the radial legs 25 and 26 are actually each composed of several radially outwardly projecting leg sections 25 a and 26 a, respectively. The leg sections or segments 25 a and 26 a are at small intervals next to each other and form essentially uninterrupted circular platforms, which in the arrangement according to FIGS. 1, 2 and 5 in the axial direction on the thin rings 15 and 16 essentially over the whole Attack the circumferential length.

The cross piece 27 also consists of a plurality of cross piece segments 27 a, which hold the leg segments 25 a and 26 a resiliently in their position.

More precisely, the Ouerstücksegmente27a with the upper and lower leg segments are connected in such a way that two crosspiece segments 27a with each leg segment consist of one piece, but also in such a way that in no case two adjacent crosspiece segments with both one and the same upper leg segment 25 α and a and the same lower segment 26 a are connected. In other words, while each cross piece segment 27a α with an upper leg segment 25 and a lower leg segment is connected to 26a, when viewed in each case a cross-piece segment 27a, a this segment immediately adjacent crosspiece segment 27 is a bottom, either with the same upper leg segment or with the same Leg segment connected, and this adjacent

Segment is also with an adjacent lower leg segment or an adjacent upper Leg segment connected, etc. In this arrangement, first upper and lower leg segments are respectively connected to one and the same crosspiece segment. A second crosspiece segment is in Connection to the first upper leg segment and to a second lower leg segment; a third crosspiece segment is lower with the second

bends the strip so that it has a substantially U-shaped cross-sectional shape, the edge portions 35 and 36 run essentially parallel to one another, while the webs or connecting 5 parts 33 form the base of the U-shape. The strip, which is now U-shaped over its entire length Has cross-section, is then formed into a substantially circular ring, and the curved base of the U-shape is flattened, and

Leg segment and with a second upper io first in the course of a full leg segment in FIG. 6 connected, etc. In view of these lines indicated intermediate stage, in the arrangement, the material is continuously zig-evenly outwardly curved sections 40 and 2-lobed shape and forms a resilient expansion 41, while part of the base is already in the and spacer ring 14 such that the ring is substantially flattened, as indicated at 42 14 is resilient as a whole in the circumferential direction and 15 is, whereupon the complete flattening takes place, in the axial direction flexible upper and lower in which the form shown in Fig. 1 arises, at Carries legs that extend radially. which the curved sections towards itself-

To a spreading and unfolding according to the invention, as indicated at 28 and 29, Stand ring according to one of the basic ideas of the Er- and being on the inner surface of the expansion and finding the corresponding preferred method to produce the completely flattened transverse points of the spacer ring, if a long piece is used according to FIG. 4 to extend between the folds mentioned, stretched strip of material, which is punched out, Although it would be possible to use the ring in the manner shown in FIG. 6

that it has transverse slots 30, the ends of which are already finished in the shape indicated by volume Use ring substantially equidistant from the edges, but the one in Fig. 3 looks partially 31 and 32 of the strip, with the slots 30 25 final construction shown that the in the longitudinal direction of the strip substantially in end portions 34 of the slots or the punched are arranged at the same intervals, so that between openings 30 are essentially between the transverse webs 27 a the punched-out sections 30 in crosswise directions at the ends of the folded-over folds 28 and 29 Device extending webs or cross pieces 33 extend and extend a short distance radially outward Furthermore, the punched-out sections 30 and 30 are in the leg segments 25 a and 26 a into erSlitze preferably long and narrow, d. that is, their distance.

measurement in the transverse direction of the strip is considerable. With this construction, the legs are larger than those in the longitudinal direction of the strip segments 25 a and 26 a, essentially underneath; According to FIG. 4, the ends of the slots at 34 are broken solid surfaces which are very advantageously rounded in a substantially semicircular manner. These end sections of the slots can naturally be applied to the thin rings 15 and 16 and support the rings 15 and 16; furthermore, if necessary, also limited at right angles or otherwise an essentially complete seal can be formed over a wide area. Between the ends 34 between the radial surfaces of the leg segments of the punched-out parts 30 on the one hand and the edges and the thin rings 15 and 16 and between the or edges 31 and 32 on the other hand, the edge 40 radial surfaces of these rings and those of the oil sections 35 and 36 correspond in terms of their annular groove 11. Furthermore, the bent portions 28 α and 29 α of the cross-piece segments 27 α contact shoulders for the inner surface of the thin rings 15 and 16, and these contact shoulders are arranged as shown in FIG of points of contact between the crosspiece segments and the thin rings, whereby the latter are expanded substantially uniformly, one being substantially

is indicated at 37 and 38, and in fact there are uniform contraction of the thin rings in the 50 Edges 31 and 32 alternating cuts ge circumferential direction is possible.

leads, which is at the end portions 34 of the slots 30 of the expansion and spacer ring formed in this way

end up. In other words, while the slits or resilient are expandable and designed so that he can Sections 37 in the edge portion 35, which extend the radially with its transverse webs 27 a or with its base Limiting leg segments 25, in 55 section supported radially at the base of the oil ring groove, Transverse direction from the first, the third and around the flexible thin rings 15 and 16 equal-

Width in the transverse direction of the strip of the radial dimension of the radially extending legs 25 and 26 of the expanding and spacer ring 14, the legs of which they form after the ring 14 has been completed.

For this purpose and in order to subdivide the legs into segments • that allow a spreading in the circumferential direction allow, the edge portions 35 and 36 are slit or cut transversely, as is

of the fifth punched opening 30 and extend to the edge 31, the extend Slots or cuts 38 within the edge section 36, which the radially outwardly projecting 60 limit lower leg segments 26, each stamped from the end of the second, fourth and sixth opening 30 out to the rim or the

to spread them outwards moderately and they both against the radial surfaces of the oil ring groove and against the To press cylinder wall 19.

Furthermore, the bent sections 28 and 29 of the expanding and spacer ring give the legs or leg segments an outwardly directed flexibility or a resilience, see above that the thin rings with sealing effect

Edge 32.

After punching out and cutting the strip 65 printed against the radial surfaces of the oil ring groove

fens in the manner described the procedure will be.

for forming the ring furthermore preferably there- It is obvious that on the protruding leg, that the strips can be modified to a suitable length and shown as an example cuts to a resilient expansion and modifications can be made without the Stand ring 14 to be able to produce, whereupon you leave 7 ° area of the invention.

Claims (1)

Claim ·. Sealing ring unit for a piston, consisting of two radially expandable thin ones Sealing rings and a U-shaped expansion and spacer ring located axially between them, whose web part and its legs are divided in such a way that two adjacent webs each one end with one of two adjacent leg sections and at the other end are connected to one and the same leg section, characterized in that the webs (27 a) are in a known manner on the inner circumference of the U-shaped expansion and spacer ring (14) and to form shoulders that cooperate with the inner surfaces of the sealing rings (15, 16), one above and one below have themselves bent back section (28, 29). Considered publications:
U.S. Patents Nos. 2,220,948, 2231,801,
635 022, 2 656 230, 2 695 825. 1 sheet of drawings