Method for elastically deforming a circular sealing ring into a kidney shape and associated sealing ring deformation device

Abstract

A method for elastically deforming a circular sealing ring (1) to a circumferential diameter (D U ) which is smaller than the outer diameter (D A ) of the undeformed, circular sealing ring (1), comprises the following method steps according to the invention: Deforming the circular sealing ring (1) into a waisted sealing ring (1') with two opposing end loops (2, 3) and a waist (4) located therebetween with two opposing waist sections (4a, 4b) by pressing two sections (5a, 5b) of the circular sealing ring (1) together until the two sections (5a, 5b) form the two waist sections (4a, 4b); and Clamping the two waist sections (4a, 4b) to one another between a convex deflection element (6) and a counter-bearing element (7) and bending the two loops (2, 3) around the convex deflection element (6) without relative displacement of the clamped waist sections (4a, 4b) to form a kidney-shaped sealing ring (1"), the circumferential diameter (D U ) smaller than the outer diameter (D A ) of the undeformed, circular sealing ring (1).

Description

[0001] The present invention relates to a method for elastically deforming a circular sealing ring to a circumferential diameter which is smaller than the outer diameter of the undeformed, circular sealing ring, as well as to an associated sealing ring deformation device.

[0002] To insert a circular sealing ring into the internal annular groove of an opening, the circular sealing ring must first be elastically deformed to a circumferential diameter smaller than the opening diameter. Once the deformed sealing ring is positioned within the opening, the sealing ring is released, allowing it to relax into its original circular shape due to its inherent elasticity, thereby automatically settling into the annular groove.

[0003] In the Fig. 5a, Fig. Figure 5b shows a conventional sealing ring deformation device 100 for elastically deforming a circular sealing ring 101 into a kidney shape, the circumference diameter of which is smaller than the outer diameter of the undeformed, circular sealing ring 101. The sealing ring deformation device 100 has four rollers 102-105, of which three rollers 102-14 are arranged stationary along their circumference at 3, 6, and 9 o'clock. A fourth roller is tangent in its Fig. 5a, the circumference is on the inside at 0 o'clock and is mounted so as to be displaceable radially inwards beyond the circumference center in the direction of the middle roller 103 in the direction of the double arrow.

[0004] A circular sealing ring 101, whose inner diameter is equal to or slightly larger than the circumferential diameter, is inserted into the sealing ring deformation device 100 and its inner side is tangent to the three rollers 102-104 and its outer side is tangent to the fourth roller 105 located in its outer end position ( Fig. 5a). The fourth roller 105 is then pushed into its inner end position, whereby the associated sealing ring section of the fourth roller 105 is pulled radially inward and folded from a convex to a concave curvature. As a result, the sealing ring 101 is bent into a U-shape at the two lateral rollers 102, 104 and at the fourth roller 105 to form a kidney-shaped sealing ring 101' whose circumferential diameter is smaller than the outer diameter of the undeformed, circular sealing ring 101.

[0005] With this well-known assembly principle, the sealing ring is deformed by radial compression using the displaced fourth deflection roller and two lateral deflection rollers to define the kidney-shaped contour. The resulting deformation of a three-point bend works against the natural (circular) resistance of the sealing ring, making this assembly principle unsuitable for sealing rings made of stiff / brittle materials.

[0006] DE 10 2026 108 336 A1 further discloses a method for inserting an elastic ring into an internal groove in a workpiece opening. The elastic ring is inserted from its radial inner side with holding regions into outwardly open receptacles of holders, and the holders are moved into a guide opening of a die, wherein the guide opening is defined by an inner wall. The guide opening narrows toward its outlet end facing the workpiece, and the holders are positioned in the die such that the elastic ring can contact the inner wall with its regions located between the holding regions, and these regions are bent counter to the insertion direction upon movement into the die, forming trailing, bent regions.The ring is then moved through the nosepiece into the workpiece opening using the holders, and the holding areas are transferred into the groove. Finally, a slider is moved into the workpiece opening to press the trailing, bent areas axially toward the groove.

[0007] In contrast, the present invention is based on the object of providing both an alternative method for elastically deforming a circular sealing ring into a kidney shape, which is particularly suitable for stiffer / brittle materials compared to the conventional method, as well as an associated sealing ring deformation device.

[0008] This object is achieved according to the invention by a method comprising the following process steps: a) deforming the circular sealing ring into a waisted sealing ring with two opposing end loops and a waist therebetween with two opposing waist sections by pressing two sections of the circular sealing ring together until the two sections form the two waist sections; and b1) clamping the two waist sections together between a convex, in particular circular-cylindrical, deflection element and a counter-bearing element and bending the two loops around the convex deflection element without relative displacement of the clamped waist sections to form a kidney-shaped sealing ring whose circumferential diameter is smaller than the outer diameter of the undeformed, circular sealing ring; or b2) Bending one, first loop around a convex, in particular circular-cylindrical, deflection element, clamping the two waist sections to one another between the convex deflection element and a counter-bearing element and bending the other, second loop around the convex deflection element without relative displacement of the clamped waist sections to form a kidney-shaped sealing ring whose circumferential diameter is smaller than the outer diameter of the undeformed, circular sealing ring.

[0009] According to the invention, the two waist sections of the tapered sealing ring are clamped against each other at the latest before the second loop is bent, preventing any relative movement of the two waist sections transverse to the clamping direction or in the longitudinal direction of the tapered sealing ring. Particularly with sealing rings made of stiff / brittle materials, relative movement of the two waist sections occurring when bending the loop(s) can render the sealing ring unusable.

[0010] The method according to the invention offers in particular the following advantages: - The convex deflection element enables a significantly larger bending radius, which means that sealing rings made of stiffer / brittle materials can be deformed into the kidney shape than with the conventional process. - Bending the two loops around the convex deflection element is more gentle on the material than a 3-point bend against the circular resistance of the sealing ring. - The process variant b2) allows the sealing ring a defined clearance when bending the first loop and reduces the forced deformation. - Tests show clear potential for a higher assembly / deformation speed for the inventive method than with the conventional method.

[0011] Preferably, the two bent loops are each secured by means of a fixing element arranged within the loop, in particular at the end of the loop facing away from the waist. The shape of the kidney-shaped sealing ring is preferably determined solely by the deflection element and the fixing elements.

[0012] Particularly preferably, in step a), the circular sealing ring is deformed into a tapered sealing ring with two loops of different lengths, whereby the waist is formed and clamped off-center, not in the center of the elongated sealing ring. The length ratio of the two loops of different lengths is advantageously between 2.5 to 1 and 1.5 to 1, in particular 2 to 1.

[0013] Preferably, in steps b1) and b2), the convex deflection element is moved toward the counter-bearing element to clamp the waist sections therebetween. The counter-bearing element can thus be arranged in a stationary manner.

[0014] In a preferred method variant, one or each of the two loops is bent around the convex deflection element by pressing the outer loop branch of the respective loop around the convex deflection element by a pressure element acting on the outside of the loop. The pressure element is mounted for movement around the deflection element, for example, in a linear or arcuate manner.

[0015] In another preferred method variant, one or each of the two loops is bent around the convex deflection element by pulling the inner loop branch with respect to the convex deflection element or the free loop end of the respective loop facing away from the waist around the convex deflection element by a tension element acting on the inside of the loop. The tension element is mounted, for example, so as to be movable linearly or in an arc around the deflection element. In an advantageous further development of this method variant, in steps b1) and b2), a loop that has been pulled around is guided with its outer loop branch along a shaping contour on the outside, which is concavely curved in particular according to the desired outer contour of the kidney-shaped sealing ring.In particular, if the sealing ring does not have a symmetrical cross-section but differently profiled inner and outer sides, torsion of the sealing ring can be counteracted by contact with the shaping contour.

[0016] The invention also relates to a sealing ring deformation device for elastically deforming a circular sealing ring to a circumferential diameter which is smaller than the outer diameter of the undeformed, circular sealing ring, with a convex, in particular circular-cylindrical, deflection element and a counter-bearing element which are movable relative to one another in order to clamp a waist of the waisted deformed sealing ring therebetween, and with two pressure or tension elements arranged on both sides of the convex deflection element, which are each movable between an initial and an end position in order to bend two end loops of the waisted deformed sealing ring in a kidney shape around the convex deflection element.

[0017] Preferably, the tension element is arranged within a loop of the tapered sealing ring to pull the respective loop around the deflecting element, and the pressure element is arranged outside a loop of the tapered sealing ring to press the respective loop around the deflecting element. A pressure side of the pressure element pressing on the loop can advantageously be concave, in particular circularly cylindrical, which counteracts torsion of the sealing ring.

[0018] In a particularly preferred embodiment, the counter-bearing element is designed as a first lever, which is pivotally mounted at one end on the housing side and, in a closed pivot position, clamps the waist of the tapered sealing ring against the convex deflection element. In an advantageous further development of this embodiment, the pressure element can be designed as a second lever, which is pivotally mounted at one end on the free end of the first lever and, in a closed pivot position, presses the loop around the convex deflection element.

[0019] Preferably, the deflection element and the tension element are attached to a mounting plate that is rotatably mounted in a bearing opening of a bearing housing. Advantageously, the bearing housing can have a fixed peripheral wall that extends along a partial circumference of the mounting plate and whose partially circular inner side extends the bearing opening upward.

[0020] Further advantages and advantageous embodiments of the subject matter of the invention can be found in the description, the drawings, and the claims. Likewise, the features mentioned above and those listed below can be used individually or in combination in any desired manner. The embodiments shown and described are not to be understood as an exhaustive list, but merely as examples for describing the invention.

[0021] They show: Fig. 1a-1e show the individual method steps of a first method according to the invention for elastically deforming a circular sealing ring into a kidney shape; Fig. 2a-2f show the individual process steps of a second process according to the invention for elastically deforming a circular sealing ring into a kidney shape; Fig. 3 a sealing ring deformation device according to the invention for elastically deforming a circular sealing ring into a kidney shape; Fig. 4a-4f show the individual process steps for elastically deforming a circular sealing ring by means of the Fig. 3 shown deflection tool into a kidney shape; and Fig. 5a, Fig. 5b the individual process steps of a conventional process for elastically deforming a circular sealing ring into a kidney shape.

[0022] The Fig. 1a-1e show the individual process steps of a process for elastically deforming a circular sealing ring 1 with outer diameter D A into a kidney shape, whose circumferential diameter D U smaller than the outer diameter D A of the undeformed, circular sealing ring 1.

[0023] The Fig. The circular sealing ring 1 shown in Figure 1a is deformed into a waisted sealing ring 1' by compressing two diametrically opposed sections 5a, 5b radially inwards ( Fig. 1b). The waisted sealing ring 1' has two opposing end loops 2, 3 and, between them, a waist 4 with two opposing waist sections 4a, 4b, which are formed by the two compressed sections 5a, 5b.

[0024] The two waist sections 4a, 4b are clamped together between a convex, here circular-cylindrical deflection element 6 and a counter-bearing element 7 ( Fig. 1c), as indicated by the two arrows A. For this purpose, at least one of these two elements 6, 7 is moved toward the other element to clamp the two waist sections 4a, 4b between them. The deflection element 6 can, for example, be a fixed or freely rotatable roller. The counter-bearing element 7 can, for example, be arranged in a fixed position, so that only the deflection element 6 is moved.

[0025] Subsequently, the two loops 2, 3 are bent around the deflection element 6 without relative displacement of the waist sections 4a, 4b clamped to each other ( Fig. 1d) to form a kidney-shaped sealing ring 1" whose circumferential diameter D U smaller than the outer diameter D Aof the undeformed, circular sealing ring 1. The bending of the two loops 2, 3 around the deflection element 6 takes place in that either the outer loop branch 9 of a loop 2, 3 with respect to the deflection element 6 is pressed around the deflection element 6 by a pressure element 12, in this case pin-shaped, which acts on the outside of the loop, as indicated by the arrow B, or in that the inner loop branch 10 with respect to the deflection element 6 or the free loop end 11 of a loop 2, 3 facing away from the waist is pulled around the deflection element 6 by a tension element 13, in this case pin-shaped, which is arranged inside the loop 2, 3, as indicated by the arrow C. The pressure and tension elements 12, 13 are mounted so as to be movable, for example, linearly or in an arc around the deflection element 6.

[0026] Finally, a fixing element 8 is arranged within the bent loops 2, 3, which is adjacent to the free loop end 11 ( Fig. 1e) to fix the loops 2, 3 in their bent shape and to continue to clamp the two waist sections 4a, 4a against the deflection element 6. If present, the tension element 13 can simultaneously assume the function of the fixing element 8. The kidney-shaped sealing ring 1" is now fixed in its shape by the deflection element 6 and the two fixing elements 8, but not also by the counter-bearing element 7.

[0027] The Fig. 2a-fe show the individual process steps of an alternative process for the elastic deformation of a circular sealing ring 1 with outer diameter D A into a kidney shape, whose circumferential diameter D U smaller than the outer diameter D A of the undeformed, circular sealing ring 1.

[0028] The Fig. The circular sealing ring 1 shown in Figure 2a is deformed into a waisted sealing ring 1' by compressing two diametrically opposed sections 5a, 5b radially inwards ( Fig. 2b). The waisted sealing ring 1' has two opposing end loops 2, 3 and, between them, a waist 4 with two opposing waist sections 4a, 4b, which are formed by the two compressed sections 5a, 5b.

[0029] The Fig. 2b right loop 3 is bent around a convex, here circular cylindrical deflection element 6 ( Fig. 2c), and then the two waist sections 4a, 4b are clamped together between the deflection element 6 and a counter-bearing element 7 ( Fig. 2d), as indicated by the two arrows A. For this purpose, at least one of these two elements 6, 7 is moved toward the other element to clamp the two waist sections 4a, 4b between them. The deflection element 6 can, for example, be a fixed or freely rotatable roller. The counter-bearing element 7 can, for example, be arranged in a fixed position, so that only the deflection element 6 is moved.

[0030] Subsequently, the left loop 2 is also bent around the deflection element 6 without relative displacement of the waist sections 4a, 4b clamped together ( Fig. 2e) to form a kidney-shaped sealing ring 1" whose circumferential diameter D U smaller than the outer diameter D Aof the undeformed, circular sealing ring 1. The bending of the two loops 2, 3 around the deflection element 6 takes place in that either the outer loop branch 9 of a loop 2, 3 with respect to the deflection element 6 is pressed around the deflection element 6 by a pin-shaped pressure element 12 acting on the outside of the loop, as indicated by arrows B, or in that the inner loop branch 10 with respect to the deflection element 6 or the free loop end 11 of a loop 2, 3 facing away from the waist is pulled around the deflection element 6 by a tension element 13 acting on the inside of the loop, as indicated by arrows C. The pressure and tension elements 12, 13 are mounted so as to be movable, for example, linearly or in an arc around the deflection element 6.

[0031] At the latest now, a fixing element 8 is arranged within the bent loops 2, 3, resting on the free loop end 11 ( Fig. 2f) to fix the loops 2, 3 in their bent shape and to continue to clamp the two waist sections 4a, 4a against the deflection element 6. If present, the tension element 13 can simultaneously also assume the function of the fixing element 8. The kidney-shaped sealing ring 1" is now fixed in its shape by the deflection element 6 and the two fixing elements 8, but not also by the counter-bearing element 7.

[0032] Instead of being pin-shaped, as in the Fig. 1 and Fig. 2, the pressure elements 12 can also extend along the outer loop branch 9 and be concavely curved according to the desired outer contour of the kidney-shaped sealing ring 1".

[0033] Instead of the same length as in the Fig. 1 and Fig. 2, the two loops 2, 3 can also be designed with different lengths by forming and clamping the waist 4 not in the middle of the elongated sealing ring 1, but off-center.

[0034] The Fig. The sealing ring deformation device 20 shown in Figure 3 serves to elastically deform a circular sealing ring 1 into a kidney shape and comprises a bearing housing 21, here in the shape of a ring, in the bearing opening 22 of which a circular mounting plate 23 is mounted so as to be rotatable about a rotation axis 24. On its upper side, the mounting plate 23 has a tension element 13 in the form of a small roller 25, a plug-in opening 26 located diametrically opposite the small roller 25, here with respect to the rotation axis 23, and a convex deflection element 6 in the form of a large roller 27. The large roller 27 is arranged in the circumferential direction of the mounting plate 23 between the small roller 25 and the plug-in opening 26, in this case closer to the small roller 24. The rollers 25, 27 can be freely rotatably mounted or fixed.

[0035] Above the mounting plate 23, the bearing housing 21 has a fixed, here circular ring-segment-shaped peripheral wall 28, which extends along a partial circumference of the mounting plate 23 and whose partially circular inner side (shaping contour) 29 extends the bearing opening 22 in the axial direction or upwards. Adjacent to the peripheral wall 28 is a first lever arm 30, here in the shape of a circular arc, which is pivotally mounted on the bearing housing 21 about an axis 31 parallel to the axis of rotation 24 and has a partially circular inner side 32. At the free end of the first lever arm 30, a pressure element 12 in the form of a second lever arm 33, here in the shape of a circular arc, is pivotally mounted about an axis 34 parallel to the axis of rotation 24 and has a partially circular inner side (shaping contour) 35. The first lever arm 30 can, as in the present case, be shorter than the second lever arm 33. In their Fig. In the closed positions shown in Figure 3, the two lever arms 30, 33 extend along a partial circumference of the mounting plate 23 and extend the bearing opening 22 in the axial direction or upwards with their partially circular inner sides 32, 35. The peripheral wall 28 and the closed lever arms 30, 33 extend approximately 270° along the mounting plate 23. The two lever arms 30, 33 can be pivoted outward from their closed positions into an open position, as shown in Fig. 4c is shown.

[0036] The individual method steps for elastically deforming a circular sealing ring 1 by means of the sealing ring deformation device 20 into a kidney shape whose circumferential diameter is smaller than the outer diameter of the undeformed, circular sealing ring 1 are described below. Fig. 4a shows the circular sealing ring 1 with outer diameter D A. The sealing ring 1' can optionally be pre-formed - by elastic compression - into an elongated pear shape with a narrow and a wide loop 2, 3 ( Fig. 4b). Preferably, the wide loop 3 is approximately twice as long as the narrow loop 2.

[0037] The lever arms 30, 33 are opened, and the mounting plate 23 is rotated in the bearing housing 21 until the small roller 25 is at the level of the lever-facing end of the peripheral wall 28. Then, the pre-formed sealing ring 1' with its narrow loop 2 is placed around the small roller 25 ( Fig. 4c), whereby the wide loop 3 protrudes outwards from the bearing housing 21. The mounting plate 23 in the bearing housing 21 is then rotated approximately 45° clockwise, whereby the narrow loop 2 is pulled along by the small roller 5 and thereby the narrow loop 2 is bent around the large roller 27 ( Fig. 4d). The outer loop branch 9 of the narrow loop 2 is guided along the partially circular inner side 29 of the peripheral wall 28 and rests against it. A waist with two opposing waist sections 4a, 4b is formed between the two loops 2, 3. The small roller 25 forms a fixing element 8 that fixes the narrow loop 2.

[0038] The first lever arm 30 is pivoted inwards into its closed position and fixed in this position, whereby the two waist sections 4a, 4b are clamped together between the large roller 27 and the first lever arm 30 ( Fig. 4e).

[0039] Then, the second lever arm 33 is also pivoted inward into its closed position and fixed in this position, whereby the wide loop 3 is pressed around the large roller 27 without relative displacement of the clamped waist sections 4a, 4b. The outer loop branch 9 of the wide loop 3 rests against the partially circular inner side 35 of the second lever 33. Finally, the bent wide loop 3 is fixed by means of a fixing element 8, here in the form of a small roller 36, inserted into the plug-in opening 26 ( Fig. 4f).

[0040] The resulting kidney-shaped sealing ring 1" has a circumferential diameter that corresponds to the opening diameter of the bearing opening 22 and is smaller than the outer diameter D A of the undeformed, circular sealing ring 1.

[0041] The guidance or contact of the sealing ring 1 on the part-circular inner sides 29, 32, 35 counteracts a torsion of the sealing ring 1, in particular if the sealing ring does not have a symmetrical cross-section, but differently profiled inner and outer sides.

[0042] Instead of the two lever arms shown, it is also possible to have just one lever arm that handles both clamping and bending, or even several second lever arms for successively bending a loop.

[0043] To install the kidney-shaped sealing ring 1" into an internal annular groove of a machine part opening, the two levers 30, 33 are opened. The mounting plate 23 including the sealing ring 1" is removed from the bearing housing 21 and positioned within the machine part opening. Then, the large roller 27 is removed from the mounting plate 23, thereby releasing the sealing ring 1", which relaxes into its original circular shape due to its inherent elasticity and automatically fits into the annular groove.

Claims

[1] Method for elastically deforming a circular sealing ring (1) to a circumferential diameter (Du) which is smaller than the outer diameter (D A ) of the undeformed, circular sealing ring (1), characterized by following procedural steps: a) deforming the circular sealing ring (1) into a waisted sealing ring (1') with two opposing end loops (2, 3) and a waist (4) located therebetween with two opposing waist sections (4a, 4b) by pressing two sections (5a, 5b) of the circular sealing ring (1) together until the two sections (5a, 5b) form the two waist sections (4a, 4b); and b1) clamping the two waist sections (4a, 4b) to one another between a convex, in particular circular-cylindrical deflection element (6) and a counter-bearing element (7) and bending the two loops (2, 3) around the convex deflection element (6) without relative displacement of the clamped waist sections (4a, 4b) to form a kidney-shaped sealing ring (1"), the circumferential diameter (Du) of which is smaller than the outer diameter (D A ) of the undeformed, circular sealing ring (1); or b2) Bending the first loop (2) around a convex, in particular circular-cylindrical, deflection element (6), clamping the two waist sections (4a, 4b) to one another between the convex deflection element (6) and a counter-bearing element (7) and bending the other, second loop (3) around the convex deflection element (6) without relative displacement of the clamped waist sections (4a, 4b) to form a kidney-shaped sealing ring (1"), the circumferential diameter (Du) of which is smaller than the outer diameter (D A ) of the undeformed, circular sealing ring (1). [2] Method according to claim 1, characterized by that the two bent loops (2, 3) are each fixed by means of a fixing element (8) arranged inside the loop, in particular at the loop end (11) facing away from the waist. [3] Method according to claim 1 or 2, characterized bythat in step a) the circular sealing ring (1) is deformed into the waisted sealing ring (1') with two loops (2, 3) of different lengths. [4] Method according to claim 3, characterized by that the length ratio of the two loops (2, 3) of different lengths is between 2.5 to 1 and 1.5 to 1, in particular 2 to 1. [5] Method according to one of the preceding claims, characterized by that in steps b1) and b2) the convex deflection element (6) is moved in the direction towards the counter-bearing element (7) in order to clamp the waist sections (4a, 4b) therebetween. [6] Method according to one of the preceding claims, characterized bythat one or each of the two loops (2, 3) is bent around the convex deflection element (6) by the outer loop branch (9) of the respective loop with respect to the convex deflection element (6) being pressed around the convex deflection element (6) by a pressure element (12) acting on the outside of the loop (2, 3). [7] Method according to one of the preceding claims, characterized by that one or each of the two loops (2, 3) is bent around the convex deflection element (6) by the inner loop branch (10) with respect to the convex deflection element (6) or the free loop end (11) of the respective loop facing away from the waist being pulled around the convex deflection element (6) by a pulling element (13) acting on the inside of the loop (2, 3). [8] Method according to claim 7, characterized bythat in steps b1) and b2) a loop (2, 3) pulled around is guided with its outer loop branch (9) along the outside of a shaping contour (29, 35) which is concavely curved in particular according to the desired outer contour of the kidney-shaped sealing ring (1"). [9] Sealing ring deformation device (20) for elastically deforming a circular sealing ring (1) to a circumferential diameter (Du) which is smaller than the outer diameter (D A ) of the undeformed, circular sealing ring (1), in particular for carrying out the method according to one of the preceding claims, comprising: - a convex, in particular circular-cylindrical deflection element (6) and a counter-bearing element (7) which are movable relative to one another in order to clamp a waist (4) of the waisted sealing ring (1') therebetween, and - two pressure or tension elements (12, 13) arranged on both sides of the convex deflection element (6), each movable between an initial position and an end position in order to bend two end loops (2, 3) of the waisted sealing ring (1') in a kidney shape around the convex deflection element (6). [10] Sealing ring deformation device according to claim 9, characterized by that the deflection element (6) is designed as a roller (27). [11] Sealing ring deformation device according to claim 9 or 10, characterized by that the pulling element (13) is arranged within a loop (2, 3) of the waisted sealing ring (1') in order to pull the respective loop around the deflecting element (6). [12] Sealing ring deformation device according to claim 11, characterized by that the tension element (13) is designed as a roller (25). [13] Sealing ring deformation device according to one of claims 9 to 12, characterized bythat the pressure element (12) is arranged outside a loop (2, 3) of the waisted sealing ring (1') in order to press the respective loop around the deflection element (6). [14] Sealing ring deformation device according to claim 13, characterized by that a pressure side of the pressure element (13) pressing on the loop (2, 3) is concave, in particular circular-cylindrical. [15] Sealing ring deformation device according to one of claims 9 to 14, characterized by that the counter-bearing element (7) is designed as a first lever (30) which is pivotally mounted at one end on the housing side and, in a closed pivoting position, clamps the waist (4) of the waisted sealing ring (1') against the convex deflection element (6). [16] Sealing ring deformation device according to claim 15, characterized bythat the pressure element (13) is designed as a second lever (33) which is pivotally mounted at one end on the free end of the first lever (30) and, in a closed pivot position, presses the loop (2, 3) around the convex deflection element (6). [17] Sealing ring deformation device according to one of claims 10 to 16, characterized by that the deflection element (6) and the tension element (13) are fastened to a mounting plate (23) which is rotatably mounted in a bearing opening (22) of a bearing housing (21). [18] Sealing ring deformation device according to claim 17, characterized by that the bearing housing (21) has a fixed peripheral wall (28) which extends along a partial circumference of the mounting plate (23) and whose partially circular inner side (29) extends the bearing opening (22) in the axial direction.

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