DE6937506U - RUBBER-ELASTIC, FABRIC-REINFORCED SEALING RING FOR AN UNDIVIDED PISTON - Google Patents

Description

Asbestos and Rubber Works Martin Merkel K.G ,, 23.02 Hamburg 93 » Sanitasstrasse 17-21

Rubber-elastic, fabric-reinforced sealing ring for one

undivided piston

The invention relates to a rubber-elastic, fabric-reinforced sealing ring for an undivided piston that has a groove to accommodate the sealing ring and support rings and whose outer diameter is greater than the inner diameter of the Sealing ring.

i) The tissue reinforcement of such known sealing rings, which are also suitable for medium and heavy loads, is located on the outside of the sealing ring at its ends in order to improve the wear resistance and the lubricating properties and to stiffen it in the area of the sealing gap.

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POST CHECK HAMBURG 1476 07. BANK, COMMERZBANK A. G., HAMBURG, DEP.-KAS? E 20/12029 · TElEGR.i SPECHTZIES HAMBURG, biw. SPECHTZIES MONKS

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When using such sealing rings, the piston can only be made undivided if the fabric reinforcements ve * - are made equally thin so that the entire sealing ring can be expanded and pushed over the larger diameter parts of the piston _o The advantageous properties of the fabric reinforcement come all the more to the effect, the more blocky and thick it is. Therefore, one often accepts a division of the piston in favor of a larger fabric reinforcement.

The invention is based on the object of creating a sealing ring of the type mentioned at the beginning, which is based on an undivided Piston can be applied and is nevertheless provided with very strong tissue reinforcement «,

The solution according to the invention is that the sealing ring is radially divided into an inner, highly expandable ring part and an outer ring part with the fabric reinforcement.

on the one hand this structure of the sealing ring allows the inner, strong expandable ring part initially with relatively strong expansion to be introduced into the sealing groove and then to cover the outer ring part unstretched or only slightly stretched

On the other hand, this construction enables .i;

of the sealing ring to make the fabric reinforcements as large as g it appears to be desirable for the stability of the sealing ring and for its wear resistance.

The inner ring part expediently consists exclusively made of rubber-elastic material, while the outer at least is reinforced with fabric at the ends. The outer ring can, however according to the invention also be reinforced with fabric over its full length and thickness. The inner ring should be designed in such a way that that it presses the outer one elastically against the counter sealing surface.

The invention is explained in more detail below with reference to the drawing, which shows advantageous exemplary embodiments. Show in it:

Fig. 1 shows the schematic representation of the overall structure of a Piston and

Fig. 2 to 5 different embodiments of the sealing ring

In a known manner, the piston rod 2 running in a cylinder 1 carries a piston 3 with an annular groove 4 for receiving the sealing ring and also z \ ieier support rings 6, which, as FIG. 1 shows, can also be designed as guide rings. While in known seals of this type the sealing ring 5 must have considerable tangential flexibility in order to be able to be pulled over the diameter D of the piston 3 and still be able to rest firmly on the groove base with the diameter D, the sealing ring according to the invention consists of two radially separated parts, whose separation diameter is indicated at D _e

In the embodiment of the sealing ring indicated in FIG. 1, the outer ring part 7 consists entirely of fabric-reinforced material Material, while the inner ring part 8 is made entirely of rubber-elastic material. Both are outside and inside

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limited only by cylindrical surfaces. The outer ring Due to its fabric reinforcement covering the full volume, it has very high strength, wear resistance and good Sliding properties, the inner ring is to be designed in such a way that, when installed, it resists the outer ring part against the Opposite sealing surface of cylinder 1 presses. Its relaxed inside diameter is expediently somewhat smaller than the groove base diameter D, so that it is firmly clamped on the piston · Furthermore, its outer diameter is in the assembled state as long as the outer ring part 7 has not yet been pulled over, expediently slightly larger than the diameter D of the interface in the fully assembled state, so that on the outer ring part the desired radial force is exerted. Since the material is normally incompressible, there is a possibility of expansion at a suitable point provided for the inner ring part in that it is kept axially somewhat shorter than the groove 4, for example.

In the embodiment of FIG. 2, the outer ring part is 7 The inner surface of the outer ring part 7 as well as the inner and outer surfaces are likewise fabric-reinforced over its full volume of the inner ring part 8 are cylindrical. The outer surface of the outer ring part, however, is shaped so that it extends axially middle area forms a pocket 9 for receiving lubricant and dirt particles, which is delimited by edges 10 and 11 which, as sealing edges, favorably influence the sealing effect. The axially outer areas 12 and 13 are slightly conical designed in such a way that its diameter decreases towards the ends » This shape has the consequence that the sealing edges 10

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and 11 the desired strongest pressure on the mating sealing surface is exercised. It is indicated that the inner ring part 8 has a somewhat smaller axial length than the outer ring part 7, and for the reasons explained in connection with FIG. 1.

In the embodiments of Figs. 3 and 4, the inner ring part is made slightly wavy or toothed on the inside and outside, respectively, so that zh results at these points the desired Dehnmöglichkeit. In these cases, the inner ring part can have the same axial length as the outer ring part and the groove 4. The possibility of expansion can also be created by frontal recesses, as indicated at 19 in FIG.

In the embodiment of FIG. 3, the outer ring part 7 has its maximum diameter in the middle at 14, while the diameter drops conically towards the ends. In this way, a sealing edge is formed at 14 »The inner diameter of the outer ring part can also have a similarly opposite shape, so that the smallest inner diameter is achieved at 15 opposite point 14. The inner ring part. 1 8 can be shaped accordingly _o It can also be made cylindrical, whereby it adapts itself elastically to the shape of the Auf.snring when mounted »

4 shows an embodiment in which the fabric reinforcement of the outer ring is restricted to the end sections 16 and 17 in a block-like manner is. The inner area of the one-piece outer ring consists of rubber-elastic material, the advantageous

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haft in a known manner with a lubricant pocket 18 and this delimiting sealing edges is carried out «Instead, a sealing surface formation can be selected, as shown in the Fig. 1, 3 or 5 is shown.

In Fig. 5 a construction is shown which is similar to that of FIG is, in which, however, the conical surfaces 21 forming the sealing edge 20 merge into cylindrical parts 22 at both ends. It can a plurality of sealing edges 20 can also be arranged over the length. - When the inner ring part 8 is in this embodiment It is noteworthy that the bore in the end sections to form sealing lips 23 is conical. These sealing lips have} | an inner diameter which decreases towards the end and which is smaller than the groove base diameter, so that it is preloaded at the groove base issue.

The outside diameter D. of the piston is larger in most cases

f as the relaxed inner diameter of the outer ring. This is

visibly advantageous for the stability of the seal, but not necessarily

required.

It can be seen in Fig. 1 that the piston is designed to be undivided,

the upper half of the section representing an embodiment at

which the piston body is forged in one piece with the piston rod

is, while in the embodiment according to the lower half of the step

t the piston body is welded to the rod. This from the

Forms of design that are made possible have advantages over and over again

Bolted constructions, not only η in .si ent I i cn Jcr Production costs, but also the gate attack ι j.vei t.

Claims (4)

5QHUi :? EXPECTATIONS 1. Rubber elastic, fabric reinforced sealing ring for an undivided Piston which has a groove for receiving the sealing ring and support rings and whose outer diameter is larger is than the inner diameter of the sealing ring, characterized in that the sealing ring (5) is divided radially into one inner, highly stretchable ring part (8) and an outer ring part (7) with fabric reinforcement 2. Sealing ring according to claim 1, characterized in that the inner ring part is made exclusively of elastic material best ¹ t and the outer is fabric-reinforced at least at the ends 3 · Sealing ring according to claim 2, characterized in that the outer ring is reinforced with fabric over its full length and thickness. 4. Sealing ring according to one of claims 1 to 3j, characterized in that the inner ring presses the outer elastically against the mating sealing surface _q