DE1045747B - Seal with spring element - Google Patents

Description

The invention relates to seals in which the compliant sealing member by a resilient element is pressed fully against the body to be sealed. Preferably it is about shaft seals or seals with so-called. Hat, cup and chevron seals, U-rings, Lip rings and the like are known to be closed for pressing the sealing member into a ring Use coil springs, so-called worm springs, which are placed on the body to be tensioned will. A disadvantage here is that the springs are attached by a special one in the sleeve Groove must be held, and that it is very difficult to put the spring so that its line of action comes to rest over the sealing edge. Also makes the achievement of the necessary preload of the spring frequent difficulties.

There are also so-called tongue springs become known, which by punching out a with a hole provided annular disc are made from a spring steel strip, characterized in that the hole part tongue-like feathered and the tongues are then raised. These springs have the disadvantage that a lot of expensive material falls off and that the tongues diverge when they are raised, so that you are mutually exclusive Distance becomes too great. Another disadvantage is that there is a different set of tools for each size of seal is necessary for spring manufacture.

Finally, spring elements for sealing sleeves have also become known, which consist of an in evenly spaced from both sides to about the middle of its width incised resilient There are tape that is bent around its longitudinal center in such a way that both sides directly adjoining one another Resilient tongues are formed, which only each over the front tongue parts with the neighboring Tongues related. These spring elements can only be used to press double lip seals of U-shaped cross-section can be used because they do not have a rigid link and be held only by the fact that the tongue ends behind reinforced edge projections of the two Support sealing lips. Their application is therefore to a few, very specific types of seals limited.

Stuffing box seals are also known, in which between the two legs of the sealing sleeves a snake-like turns Spring wire formed annular spring element lies.

The subject of the invention is a seal with a spring element for pressing the resilient sealing member in the radial or axial direction with radial, spaced from each other, but above one Seal with spring element

Applicant:

Copper asbestos co. Gustav Bach,
Heilbronn / Neckar

Gustav Augustin, Heilbronn / Neckar,
has been named as the inventor

Comb web-related resilient tongues, which lie against the sealing lip of the elastic sealing member clamped in a seal housing, in which the spring element made in a manner known per se from an endless band of resilient material is cut on one side and bent in a U-shape in the area of the resilient tongues thus created and is joined together to form a flangeless, cylindrical, rigid ring. The mutual distance between the adjacent tongues of the spring element corresponds in the respective unit of measurement to the circular factor π or an integral fraction or integral multiple of this value. This means that when the band is closed to form a ring, the division opens for every mm of enlargement or reduction in size of the ring, ie a ring can be formed from a band punched with this division for every mm of diameter. If the division is chosen so that the tongue width corresponds to the gap width, then two springs can be punched out of a strip, whereby any waste is avoided. The punched band is then bent, for example in the case of seals whose clamping part is cylindrical and whose sealing part runs against a shaft in the radial direction, by about 180 °, in such a way that the radius of curvature lies exclusively in the tongue part. The band bent in this way is now closed to form a ring, so that the non-feathered part of the band, i.e. the part that connects the individual tongues to one another, has a cylindrical shape. The two ends of the annular spring element can be insoluble, e.g. B. by welding, soldering od. Like. Be connected to each other. But it is also possible to make the two ring ends soluble, for. B. od by plugging into one another in the manner of a bayonet lock. Like. To connect with one another.

If the spring element is used with shaft seals, according to the radial sealing rings, such as

«09 6S7 / 321-

Claims (11)

3 4 those the forms DIN 6503 and 6504 show, lip tip 3 thick and tight on a not shown then the closed ring part with soft material can open up the shaft. To secure the contact pressure seat serve as a stiffening member. In such cases, the spring element 4, which is bent in a U-shape, is used can the resilient ring for the purpose of reinforcement and partly. against the sealing lip and partly against the its stability in a manner known per se. 5 metal housing. z. B. stiffened by beads and flanging, etc. Fig. 3 explains the production of the spring element, are. A stiffening of the resilient. Ring is a band of resilient material of width B, for example by inserting another one, is split or punched in such a way that two strips of 5 ring are possible. The spring element 6 and 6 will advantageously be produced, which have tongues 7 and 8 made of different thicknesses of material on the longitudinal side, and both have. In this type of manufacture there is no example such that the ring part against the waste, since both the part 5 and the part 6 exactly resilient part has a greater strength. The purpose is the same and spring elements can be made from both parts in the case of seals made of rubber. In this case, however, it is an advantage or a similar design option that the gap width between two tongues-facing material of the spring element with the 15 is equal to the width of the tongues. The sealing body stamped in this way, for example by vulcanization, tape, is now, as FIGS. 2 and 5 show, roughly glued or the like, firmly connected. U-shaped bent, whereby the individual tongues In order to give a seal a good function, binding part of the band to a cylindrical one, it is necessary to close the spring element after special ring 9 is closed. To shape with this kind of point of view. Advantageously, the result is that, as FIG. 4 shows, the Ab spring element is shaped and installed in such a way that, when the individual tongues 10 are in the operating state of the inner circle, the lip neck of the seal is practically smaller than originally on the outer circle 11 .
table has a cylindrical shape. The closure of the band can, as in FIG. 6 Seals according to the invention are characterized to show 8, made in different ways. To the with very special advantages. 25 Example, FIGS. 6 and 7 show an insoluble connection connections with this spring element closed components binding. In Fig. 6, the two ends are together without loose components. So in no case can it be welded. In Fig. 7 they are spot welded or how that is otherwise possible, a spring riveted off. Fall down the sealing sleeve. The production of Fig. 8 shows a releasable connection. Here is a seal is extremely simple, since no rear 30 narrow tabs 12 of one end of the ring through two cuts, such. B. pushed when vulcanizing holes 13 of the other end of the ring.
Spring grooves are required. 9 shows a shaft seal in which the ring of the sealing collar serves as an adhesive part at every point. The spring element is made of a material depending on the diameter of the seal, since depending on 35 different thicknesses, z. B. the ring part of the division of the spring on a certain part of the 14 is stronger than the tongues 15. A tongue comes to rest around the circumference. As a result, Fig. 10 shows the same type of seal as can also spring from one and the same band - Fig. 9, only here is the outer circumference of the ring elements for all sealing diameters with an elastic material, in this case with be asked. In this case only the length from which the sealing sleeve is stretched has to be different. This is what stands, overdrawn. So this is a Warehousing is much easier. Seal with soft seat. In addition to the manufacturing-related simplifications in FIG. 11, the same seal is used as a basis, but seals according to the invention have particular features as in FIG. 10. Here, the ring part has advantages. The sealing lips are stiffened in the axial 45 position of a further metal ring 17,
extremely stiffened. This is particularly Fig. 12 shows a shaft seal, which is required where it is to be sealed against pressures, since it revolves around the shaft and seals against a stationary part here in seals with the known spring elements, a so-called outer sealing seal, can occur that the whole Sealing sleeve Here the ring part is stiffened by a bead 18,
is turned inside out. 13 shows a shaft seal similar to the one more movable in the radial direction, so that it vibrates Soft seat, as the wise one can follow very well. The heat casing with a soft material layer 19 is also completely diverted from the sealing lip to the casing. significantly improved, since this is via the highly conductive 55 FIGS. 14 to 16 show seals with axial Spring element and no longer via the isolated sealing pressure. The spring elements are so cuff takes place. stalten that the tongue members 23 by approximately 90 ° From the large number of possible execution forms to ring 24 are bent. These seals Shapes of seals according to the invention are to be pressed against a collar or the like of a shaft, Individual examples are shown on the basis of drawing 60. The different versions show the same briefly described: combinations as described above. Fig. 1 shows a plan view of part of a Shaft seal, claims Fig. 2 shows a cross section through the seal according to Fig. 1. 65 1. Seal with spring element for pressing on In a metal housing 1, which is usually used for the flexible sealing member in radial or The seal is accommodated in the housing bore in the axial direction with radial, spaced apart Serves as a machine part, there is a seal against each other, but together over a ridge sleeve 2 made of elastic material, mainly hanging resilient tongues that are against the synthetic rubber. With its sealing lip, this is located in a seal housing put tensioned elastic sealing member, characterized in that the in itself known manner made of an endless band of a resilient material spring element Incised on one side, bent over into a U-shape in the area of the resilient tongues that are created as a result and is joined together to form a flangeless, cylindrical, rigid ring. 2. Seal according to claim 1, characterized in that the mutual spacing of the adjacent tongues of the spring element in the respective unit of measurement corresponds to the circular factor η or an integral fraction or integral multiple of this value. 3. Seal according to claim 1 or 2, characterized in that the two ends of the annular Insoluble spring element, z. B. by welding, soldering od. Like., Interconnected (Figures 6 and 7). 4. Seal according to claim 1 or 2, characterized in that the two ring ends are soluble, z. B. od by plugging into one another in the manner of a bayonet lock. Like. Connected to one another are (Fig. 8). 5. Seal according to claims 1 to 4, characterized in that the contiguous Part (14) of the spring element serves as an adhesive part in seals with a metal seat (Fig. 9). 6. Seal according to claims 1 to 4, characterized in that the closed ring part of the spring element serves as a stiffening element in seals with a soft seat (Fig. 10). 7. Seal according to claims 1 to 6, characterized in that the resilient ring for Purposes of reinforcing its stability in a known manner, for. B. by beading (18) and beading, etc., is stiffened (Fig. 12). 8. Seal according to claims 1 to 6, characterized in that the resilient ring is stiffened by inserting another ring (17) (Fig. 11). 9. Seal according to claims 1 to 6, characterized in that the spring element consists of is made of different strength material, z. B. such that the ring part opposite the resilient part has a greater strength (Fig. 9 and 10). 10. Seal according to claims 1 to 9, characterized in that the spring element with the sealing body is firmly connected, for. B. by vulcanization, gluing or the like. 11. Seal according to claims 1 to 10, characterized in that the spring element such is shaped and built in that the lip neck of the seal is practical in the operating state has a cylindrical shape. Considered publications:
German Patent No. 135 218;
U.S. Patent Nos. 1958 120, 2,088,703, 434,484; British Patent Nos. 589 768, 612 830;
French Patent Nos. 791 992, 801 719; Swiss Patent No. 244 133. 1 sheet of drawings © 809697/321 '11.58