Radial shaft seal ring, radial shaft seal and radial shaft seal assembly

Abstract

The invention relates to a radial shaft sealing ring (20) comprising a retaining section (24) and a sealing lip (28) which extends from the retaining section (24) in an axial direction with respect to a central axis (Z) of the radial shaft sealing ring (20) to a free edge (30) of the sealing lip. The sealing lip (28) comprises a sealing side with a sealing edge for dynamic sealing abutment on a sealing surface of the shaft or the machine part and a back side pointing away from the sealing edge in a radial direction, which is provided with a retaining groove for receiving an elastically deformable prestressing element by means of which the sealing edge can be prestressed in a radial direction against the corresponding sealing surface in the run-up of the radial shaft sealing ring. The sealing lip has recesses on the groove bottom of the retaining groove which are arranged spaced apart from one another in the circumferential direction of the radial shaft sealing ring and / or have a plurality of edge notches which each extend from the retaining groove in the radial direction to the sealing side. Each edge notch (48) is spaced apart from the sealing edge (38) and can, if necessary, completely penetrate the groove bottom (52) of the retaining groove (46).

Description

Technical Field

[0001] This invention relates to a radial shaft sealing ring, a radial shaft seal, and a radial shaft sealing assembly as described in the preamble of claim 1. Such a radial shaft sealing ring is known, for example, from US 4350 347A. Background Technology

[0002] A radial shaft seal ring (RWDR) is an installed sealing element with radially arranged sealing lips used to seal shafts and axles. Depending on the construction type, a radial shaft seal ring consists of a retaining section, typically with a metal reinforcing ring, a sealing lip extending away from the retaining section along the central axis of the radial shaft seal ring, and a preload element in the form of a rubber-elastic preload ring, a helical tension spring, or a helical compression spring. The preload element is typically arranged on the back side of the sealing lip, away from the sealing edge, and held in a retaining groove within the sealing lip.

[0003] This radial shaft seal ring may have additional functional elements, such as a dust lip or scraper lip, or a support protrusion to protect the sealing edges from overload. This radial shaft seal ring may also be provided in an assembly sleeve, in which additional sealing or functional structural elements may be persistently arranged if necessary.

[0004] Adequate lubrication of the dynamic sealing edges acting on the sealing surface is crucial for the service life of radial shaft seals. For this reason, the sealing lip may have a so-called friction structure on its sealing side, which influences or improves the lubrication of the sealing edges. However, these friction structures undergo significant wear during operation.

[0005] A radial shaft seal ring is known from US 4 350 347 A, mentioned at the beginning, which has a retaining groove that opens toward the back side or radially outward for receiving or inserting an annular spring. A radial shaft seal ring is known from JP 2013 113320 A, which has a retaining groove that opens radially outward and a through hole leading to the retaining groove for pressure unloading.

[0006] A radial axial sealing ring with a sealing lip is also known from US2 434 484 A. A retaining insert is inserted into an axially open notch in the sealing ring, which in turn serves to receive a ring spring.

[0007] Furthermore, a radial shaft seal is known from US 5,928,676 A, which has a radial shaft sealing ring and an annular spring inextricably embedded therein. The radial shaft sealing ring has L-shaped grooves that are spaced apart from each other in the circumferential direction by tabs. By manufacturing, the radial groove sections and the axial groove sections are open toward or tangential to the annular spring. Summary of the Invention

[0008] Therefore, the objective of this invention is to provide a radial shaft sealing ring, a radial shaft seal, and a radial shaft sealing assembly that can achieve improved lubrication in the sealing gap to be sealed by the radial shaft sealing ring.

[0009] The task involving the radial shaft sealing ring is solved by the radial shaft sealing ring according to claim 1. The radial shaft seal according to the invention is given in claim 11, and the radial shaft sealing assembly is given in claim 13.

[0010] The radial shaft seal ring according to the invention is used to seal a sealing gap between a shaft and machine parts surrounding the shaft. The radial shaft seal ring includes a retaining section and a sealing lip that extends from the retaining section in an axial direction relative to the central axis of the radial shaft seal ring to its free edge.

[0011] The sealing lip includes a sealing side and a back side. The sealing side has a sealing edge for dynamically sealing against the sealing surface of a shaft or machine component. The back side points radially away from the sealing edge and has a retaining groove for receiving a resiliently deformable preload element. With the aid of the preload element, during the commissioning of the radial shaft seal ring, the sealing edge can be dynamically preloaded radially against the sealing surface of the shaft or machine component.

[0012] According to the invention, the sealing lip has radial recesses on the bottom of the retaining groove, these recesses being spaced apart from each other in the circumferential direction of the radial shaft sealing ring, wherein each recess has a radial depth of 10% to 40% of the nominal thickness of the sealing lip measured between the sealing edge and the bottom of the retaining groove. In other words, the bottom of the groove is structurally defined in the circumferential direction. Alternatively or additionally, the sealing lip has a plurality of edge notches extending radially from the retaining groove to the sealing side. Each edge notch is arranged here adjacent to or spaced apart from the sealing edge so as not to impair the sealing capability of the radial shaft sealing ring. The edge notches are spaced apart from each other in the circumferential direction of the radial shaft sealing ring.

[0013] In both embodiments of the invention, the contact pressure of the sealing edge in the circumferential direction, caused by the inherent elasticity of the preload element and, if necessary, the radial shaft seal ring, can be variably adjusted. With the radial shaft seal ring installed, when there is a so-called overlap between the seal ring and the sealing surface—that is, elastic deformation of the sealing lip in the radial direction caused by installation—an edge notch on the oil side of the sealing lip has already ensured a peripherally unstable contact pressure profile between the sealing edge and the sealing surface. In this case, modification by an additional spring groove through the recess on the groove bottom side is not absolutely necessary. Nevertheless, the recess on the groove bottom side can still be used to further modify the contact pressure profile.

[0014] However, if there is no overlap between the sealing ring and the shaft to be sealed by the sealing ring due to elastic deformation of the sealing lip during installation, the recess on the bottom side of the groove is particularly effective in altering the contact pressure profile between the sealing edge and the mating sealing surface. This peripherally varying, i.e., unstable, contact pressure profile reduces wear on the sealing edge during the commissioning of the radial shaft seal ring, effectively lubricates or cools the sealing edge, and thus effectively counteracts unwanted oil and carbon formation. Overall, this can improve the service life of the radial shaft seal ring.

[0015] When wear on the sealing edges is unavoidable during commissioning, it is observed that the wear width of the sealing edges in the recessed / edge notch areas is less pronounced than in areas without such recesses / edge notches. Therefore, a decreasing wear behavior is shown here.

[0016] In the recessed region, the contact pressure between the preload element and the retaining groove of the radial shaft seal ring is reduced, and thus the acting friction is reduced. This is advantageous under operating conditions that cause frequent movement of the preload element, such as during strong dynamic eccentricity of the shaft. An alternative measure is a coating on the retaining groove, for example, to reduce friction.

[0017] Particularly preferably, the notch penetrates the bottom of the retaining groove. If the retaining groove has a rounded, particularly circular, cross-sectional shape, the bottom of the groove should be understood as a section through which a radially directed force relative to the central axis of the radial shaft seal ring can typically be applied to the sealing lip by means of a preload element arranged in the retaining groove. This extension allows for particularly high variability in the contact pressure profile between the sealing edges and the sealing surfaces respectively associated with the sealing edges during the commissioning of the radial shaft seal ring. This expands the application range of the radial shaft seal ring, particularly to high-speed applications, such as electric motors in electric vehicles, pumps, or (power) tools.

[0018] If the sealing lip of the radial shaft seal ring has not only the aforementioned recess but also an edge notch, at least one edge notch can be arranged axially aligned with the recess. In particular, some or all of the edge notches can be arranged axially aligned with the recess. During commissioning of the radial shaft seal ring, significantly lower contact pressure can be achieved in these regions compared to circumferential sections of the sealing lip without such recesses / notches, resulting in a much lower contact pressure on the sealing edges and mating sealing surfaces of the shaft or machine component. This is particularly advantageous for lubricating the dynamic contact area of ​​the sealing lip and sealing surfaces using the corresponding lubricant applied during commissioning.

[0019] According to another embodiment, at least one edge notch is arranged offset relative to the recess in the circumferential direction. In particular, some edge notches and some recesses, or all edge notches and all recesses, can be arranged offset relative to each other in the circumferential direction. Here, the notches and recesses can be arranged "with gaps" relative to each other in the axial direction. During the commissioning of the radial shaft seal ring, this allows for more differentiated or finer adjustments to the contact pressure profile of the sealing edge and the sealing surface. Besides the simple alternating sequence of "edge notch, recess, edge notch, recess, etc." in the circumferential direction, other alternating sequences of edge notches and recesses are also possible, such as "edge notch, edge notch, recess, edge notch, edge notch, etc." Of course, other non-alternating sequences or arrangements of edge notches and / or recesses in alternating and non-alternating sequences are also possible.

[0020] In the combination of these two embodiments, some recesses are arranged axially aligned with some notches, and additional recesses are arranged between these aligned arrangements. That is, the aligned recess-notch arrangement and the additional recesses are arranged offset from each other in the circumferential direction, and especially in the axial direction with gaps relative to the aligned recess-notch arrangement. This allows for a further adaptation of the contact pressure profile to the detailed effects of operating conditions.

[0021] According to an extension of the invention, the edge notches of the sealing lip may each have a circumferential extension dimension preferably at least two times or even four times larger than the free edges of the sealing lip respectively arranged between the edge notches. Thus, in the circumferential direction of the sealing lip, a first longer sealing edge segment alternates with a second shorter sealing surface segment having a correspondingly larger contact pressure, the first longer sealing edge segment being arranged at a circumferential position of the radial shaft sealing ring corresponding to the edge notch and therefore abutting the sealing surface with a smaller contact surface pressure during operation.

[0022] According to one embodiment of the invention, the sealing lip has a flange on its sealing side at the high-pressure side of the sealing edge. This flange mechanically reinforces the sealing lip in the region near the sealing edge. This is particularly advantageous for the sealing capability of the radial shaft seal ring when the sealing lip has edge notches. Furthermore, this flange effectively mitigates the risk of undesirable damage to the sealing edge during the manufacturing process of the radial shaft seal ring.

[0023] Edge notches can have arcuate, especially circular, rectangular, triangular, or free-form profiles. The geometry of the edge notch can influence the contact pressure transition between the notched and unnotched areas. The geometry of the edge notch can advantageously create eddies in the fluid / medium / oil to be sealed, thereby improving mixing or reducing temperature differences. It should be noted that a rectangular geometry of the edge notch can be advantageous in so-called grease seals because more grease can adhere to the sealing lip closer to the sealing contact.

[0024] The sealing lip of a radial shaft seal ring may comprise a rubber-elastic deformable material or polytetrafluoroethylene (PTFE), a PTFE compound, or another viscoelastic deformable material, or be composed of one of these materials.

[0025] The radial shaft seal according to the invention comprises the radial shaft sealing ring described above and a (annular) clamping element disposed in a retaining groove of the sealing lip of the radial shaft sealing ring. In the case of a radial shaft sealing ring implemented internally, the clamping element is preferably constructed in the form of a tension spring or an elastomer clamping ring, and in the case of a radial shaft sealing ring implemented externally, it is preferably constructed in the form of a compression spring.

[0026] In principle, the shaft seal ring according to the invention can also be implemented as an axial shaft seal ring, wherein the clamping element is constructed, for example, as a star spring. When the shaft seal ring according to the invention is implemented as an axial shaft seal ring, those skilled in the art know the adaptation caused by orientation that must be considered.

[0027] If the radial shaft sealing ring is provided with the aforementioned recesses, according to the invention, these recesses can have such a radial depth that the clamping element does not contact the bottom of the retaining groove, i.e., the sealing lip, in the circumferential extension dimension of the recess. Correspondingly, the edge notch can extend axially into and / or beyond the retaining groove extension to such an extent that the bottom of the groove is absent in the region of the edge notch.

[0028] The radial shaft seal assembly according to the invention includes a shaft and machine parts surrounding the shaft, which are spaced apart from each other and movably arranged relative to each other about a motion axis while forming a sealing gap. A radial shaft seal is used to seal the sealing gap, the radial shaft sealing ring of which dynamically and sealingly abuts against the sealing surface of the machine parts or shaft by means of a preload element with its sealing edges. The radial shaft seal assembly is particularly suitable for high-speed applications or other thermocritical applications where the longest possible maintenance intervals of the radial shaft seal are desirable.

[0029] Of course, the radial shaft seal ring can be fitted with additional components within the assembled cylinder, particularly support elements, retaining elements, and seals. The cylinder can be constructed from a rubber-elastic or viscoelastically deformable material.

[0030] Radial shaft seals can also be used with other seals, especially another radial shaft seal, for example, in a so-called back-to-back arrangement. Of course, radial shaft seals can also have dust lips and other functional accessories or integrated components. Attached Figure Description

[0031] Further advantages of the invention become apparent from the specification and drawings. The embodiments shown and described should not be construed as exhaustive, but rather as exemplary features used to describe the invention.

[0032] The attached diagram shows:

[0033] Figure 1 A radial shaft sealing assembly having a shaft, machine parts surrounding the shaft in the case of forming a sealing gap, and a radial shaft seal for sealing the sealing gap;

[0034] Figure 2 Shown in the exposed view according to Figure 1 A radial shaft seal comprising a radial shaft sealing ring having a preload element and an edge notch, which causes a contact pressure profile with a height variation in the circumferential direction between the sealing edge and the mating surface, or sealing surface, of the radial shaft sealing ring.

[0035] Figure 3 :according to Figure 2 A partial back-side top view of the radial shaft seal;

[0036] Figure 4 Detailed partial view of the exposed dorsal side is shown according to Figure 2 Radial shaft seal ring;

[0037] Figure 5 :according to Figure 2 Detailed local section of the radial shaft seal on the sealing edge side;

[0038] Figure 6 Another embodiment of a radial shaft seal ring is shown in detailed perspective, in which the edge notch has a large distance relative to the sealing edge;

[0039] Figure 7 : Detailed part of the radial shaft seal on the sealing edge side, in which the edge notch of the sealing lip of the radial shaft sealing ring extends approximately to the sealing edge of the sealing lip, and the edge notch extends into the retaining groove in the axial direction to such an extent that the groove bottom is missing in the area of ​​the edge notch;

[0040] Figure 8 With similar Figure 2 The view shows according to Figure 7Radial shaft seal.

[0041] Figure 9 : A perspective detail view of a radial shaft seal in which the radial shaft sealing ring has a rectangular edge notch;

[0042] Figure 10 Detailed part of a radial shaft seal ring with a triangularly implemented edge notch; and

[0043] Figure 11 : A detailed part of a radial shaft seal, in which the radial shaft sealing ring has a sealing lip with a corrugated edge notch and a corrugated sealing edge. Detailed Implementation

[0044] exist Figure 1 The diagram shows a radial shaft seal assembly 10 having a shaft 12 and machine parts 14 surrounding the shaft 12, the shaft and machine parts being spaced apart from each other and movably arranged relative to each other about a motion axis L while forming a sealing gap 16. A radial shaft seal 18 is used to seal the oil side or high-pressure side H (= the side to be sealed) relative to the outside of the sealing gap 16 or the low-pressure side N.

[0045] The radial shaft seal 18 includes a radial shaft seal ring 20 and an annular, elastically deformable rubber preload element 22. The radial shaft seal ring 20 is shown in a further detailed diagram. Figures 2 to 5 As shown in the diagram. The radial shaft seal ring 20 includes a retaining section 24, which here has, for example, an L-shaped cross-section. The retaining section itself is provided with a reinforcing element 26. The radial shaft seal ring includes a sealing lip 28 that extends from the retaining section 24 away from the retaining section 24 in a direction relative to the central axis Z of the radial shaft seal ring 20. The free edge 30 of the sealing lip 28 is here formed by an end face 32. The retaining section 24 is arranged in a mounting groove 34 that is open on the axial side of the mechanical component 14. Of course, the radial shaft seal 18 can also be arranged in a mounting cylinder (not shown) or in another set of cylindrical retaining devices, as is known to those skilled in the art. In this respect, the machine component 14 can be implemented itself as a mounting cylinder, for example.

[0046] The sealing lip 28 has a sealing side 36 with a sealing edge 38, which dynamically seals against the sealing surface 40 of the shaft 12 in a radially pre-tight manner by means of a pre-tightening element 22.

[0047] The sealing side 36 has a first surface section 36a disposed on the oil side or high-pressure side and a second surface section 36b disposed on the low-pressure side. These two surface sections are arranged obliquely relative to the sealing surface 40 at (contact surface) angles α and β, respectively, when the radial shaft sealing ring 20 is installed. The angle α that opens toward the high-pressure side H is itself greater than the angle β that opens toward the low-pressure side N.

[0048] The sealing lip 28 may form a flange 42 on the high-pressure side of the sealing edge 38 on its sealing side 36, which can protect the sealing edge 38 from undesirable damage during the manufacture of the radial shaft seal ring.

[0049] The sealing lip 28 has an annularly surrounding retaining groove 46 on its back side 44 away from the sealing edge 38. The preload element 22 is arranged in the retaining groove 46.

[0050] The sealing lip 28 is provided with a plurality of edge notches 48, which are spaced apart from each other in the circumferential direction of the radial shaft sealing ring 20. Free edge sections of the sealing lip 28 are arranged between each edge notch 48. The edge notches 48 extend axially from the circumferential profile of the free edge 30, i.e., the end face 32, of the sealing lip 28 to the retaining groove 46 and radially through the entire sealing lip 28. Therefore, the retaining groove 46 is axially penetrated towards the high-pressure side H section, as shown in... Figures 3 to 5 As shown in the diagram. Each edge notch 48 is spaced apart from the sealing edge 38 so as not to impair the sealing capability of the radial shaft seal ring 20.

[0051] according to Figure 4 In addition to the edge notch 48, the radial shaft seal ring 20 also has a recess 50 in the retaining groove 46. The recesses 50 are arranged at uniform intervals from each other in the circumferential direction of the radial shaft seal ring 20. Each recess 50 may, for example, have a radial depth t, which is 10% to 40%, particularly 10% to 20%, of the nominal thickness d of the sealing lip 28 measured between the sealing edge 38 and the bottom 52 of the retaining groove 46.

[0052] The edge notches 48 are arranged axially aligned with one of the recesses 50. This allows for particularly effective variation of the contact surface pressure between the sealing edge 38 and the sealing surface 40 in the circumferential direction. It should be noted that the edge notches 48 and the recesses 50 of the retaining groove 46 can also be arranged offset from each other in the circumferential direction, and especially can be arranged with gaps relative to each other in the axial direction. This allows for localized, fine-gradual adjustment of the contact surface pressure between the sealing edge 38 and the sealing surface 40. Some recesses can also be arranged axially aligned with some notches, and additional recesses can be arranged between these aligned recess-notch arrangements, such that the aligned recess-notch arrangements and the additional recesses are offset from each other in the circumferential direction, and especially with gaps in the axial direction.

[0053] With the radial shaft seal ring 20 installed, there is a so-called overlap between the sealing lip 28 and the sealing surface 40. That is, the elastic deformation of the sealing lip 28 in the radial direction caused by the installation of the radial shaft seal ring 20 has been ensured by the edge notch 48 on the oil side H of the sealing lip 28, between the sealing edge 38 and the sealing surface 40. Figure 1 The advantageous contact pressure profile between the two sides is achieved on the periphery. In this case, modification by an additional spring groove through the recess 50 on the bottom side of the groove is not mandatory. Although the recess on the bottom side of the groove can be used to further modify the contact pressure profile.

[0054] According to Figure 5 The top view of the sealing edge 38 of the radial shaft sealing ring 20 shown, in particular, shows that the various edge notches 48 of the sealing lip 28 can be implemented as circumferential lines.

[0055] exist Figure 6 The radial shaft sealing ring 20 shown is in Figures 2 to 5 The difference in the radial shaft seal ring 20 shown is primarily that the edge notches 48 (when the diameter of the radial shaft seal ring 20 is the same) have relatively large circumferential extension dimensions and are further spaced apart from the sealing edges 38. This structural form of the radial shaft seal ring 20 provides a manufacturing advantage, as it also more reliably avoids undesirable damage to the sealing edges 38 during the manufacturing process.

[0056] According to Figure 7 and Figure 8 The radial shaft seal ring 20 shown has an edge notch 48 that can completely penetrate the bottom 52 of the retaining groove in the axial direction and extend to the sealing edge 38 if necessary on the sealing side. In this case, the preload element 22, where the tension spring is located, is at least partially not covered by the sealing lip 28 in the radial direction. Figure 8As shown, the preload element 22 does not abut against the sealing lip 28 on the circumferential extension dimension of the corresponding edge notch 48. The preload element 22 no longer has any contact with the bottom of the groove in this area (and can be said to be "suspended in the air" in these areas).

[0057] According to Figure 9 In the embodiment shown, the edge notches 48 of the sealing lip 28 of the radial shaft sealing ring 20 can be rectangular. Thus, the sealing edge 38 and the sealing surface 40 can be realized in the sealing edge region corresponding to the circumferential sidewall 54 of the edge notch 48. Figure 1 The contact pressure gradient between them is particularly steep. This is achieved through an edge notch 48 with a triangular geometry, as in... Figure 10 As shown, further improved lubrication and cooling of the sealing edge 38 can be achieved regardless of the direction of rotation due to the converging sidewall 54 of the edge notch 48.

[0058] According to Figure 11 The radial shaft seal ring 20 shown can also have its edge notches 48 arranged sequentially in a row directly in the circumferential direction. In this case, a wavy free edge 30 of the sealing lip 28 can be created. Correspondingly, the sealing edge 38 can also be implemented in a wavy manner in the circumferential direction. This can further facilitate the lubrication of the sealing edge 38 during operation.

[0059] The above combination Figures 1 to 11 The sealing lip 28 of the radial shaft seal ring 20 shown may be composed of a rubber-elastic deformable material or polytetrafluoroethylene (PTFE), a PTFE compound, or another viscoelastic deformable material, or one of these materials. Similarly, the radial shaft seal ring 20 may also be implemented as an external seal. In this case, the preload element 22 is preferably constructed as an externally tensioned compression spring, etc.

[0060] In summary, the present invention relates to a radial shaft seal ring 20, comprising a retaining section 24 and a sealing lip 28 extending from the retaining section 24 in a direction relative to the central axis Z of the radial shaft seal ring 20 to its free end. The sealing lip 28 includes a sealing side and a back side, the sealing side having a sealing edge for dynamically sealing against a sealing surface of a shaft or machine component, the back side extending radially away from the sealing edge and having a retaining groove for receiving a resiliently deformable preload element by means of which the sealing edge can be dynamically preloaded radially against the corresponding sealing surface 40 during the commissioning of the radial shaft seal ring. The sealing lip has radial recesses spaced apart from each other in the circumferential direction of the radial shaft seal ring and / or a plurality of edge notches extending radially from the retaining groove to the sealing side. Each edge notch 48 is spaced apart from the sealing edge 38 and, if necessary, can completely penetrate the bottom 52 of the retaining groove 46.

Claims

1. A radial shaft seal ring (20) for sealing a sealing gap (16) between a shaft (12) and a machine part (14) surrounding the shaft (12), the radial shaft seal ring including a retaining section (24) and a sealing lip (28), the sealing lip extending from the retaining section (24) in a direction axial relative to the central axis (Z) of the radial shaft seal ring (20) to a free edge (30) of the sealing lip, wherein, The sealing lip (28) includes: • A sealing side (36) having a sealing edge (38) for dynamically sealing against the sealing surface (40) of the shaft (12) or the machine component (14); and • A back side (44) pointing radially away from the sealing edge (38), the back side having a radially outwardly opening retaining groove (46) for receiving an elastically deformable preload element (22), by means of which the sealing edge (38) can be preloaded radially against the sealing surface (40) of the shaft (12) during the engagement of the radial shaft sealing ring (20). Its features are, a) The bottom (52) of the retaining groove (46) has radially spaced recesses (50) arranged at intervals from each other in the circumferential direction of the radial shaft sealing ring (20), wherein each recess (50) has a radial depth (t) that is 10% to 40% of the nominal thickness (d) of the sealing lip (28) measured between the sealing edge (38) and the bottom (52) of the retaining groove (46), and / or b) The sealing lip (28) has a plurality of edge notches (48), wherein the plurality of edge notches (48) are arranged spaced apart from each other in the circumferential direction of the radial shaft sealing ring (20), wherein each edge notch (48) contacts or is spaced apart from the sealing edge (38) and extends radially from the sealing side (36) to the retaining groove (46).

2. The radial shaft sealing ring (20) according to claim 1, characterized in that, The edge notch (48) penetrates the bottom (52) of the retaining groove (46).

3. The radial shaft sealing ring (20) according to claim 1 or 2, characterized in that, At least one edge notch (48) is arranged aligned with the recess (50) in the axial direction.

4. The radial shaft sealing ring (20) according to claim 1 or 2, characterized in that, At least one edge notch (48) is arranged offset in the circumferential direction relative to the recess (50).

5. The radial shaft sealing ring (20) according to claim 1 or 2, characterized in that, At least some edge notches (48) and some recesses (50) are arranged with gaps between each other in the axial direction.

6. The radial shaft sealing ring (20) according to claim 1 or 2, characterized in that, The sealing lip (28) forms a flange (42) on its sealing side (36) on the high-pressure side of the sealing edge (38).

7. The radial shaft sealing ring (20) according to claim 1 or 2, characterized in that, The edge notch (48) has a larger circumferential extension dimension than the free edge of the sealing lip arranged between the edge notches.

8. The radial shaft sealing ring (20) according to claim 1 or 2, characterized in that, The edge notch (48) has an arc-shaped, rectangular, triangular or free-form outline.

9. The radial shaft sealing ring (20) according to claim 1 or 2, characterized in that, The sealing lip (28) comprises a rubber-elastic deformable material or a viscoelastic deformable material, or is composed of one of these materials.

10. The radial shaft sealing ring (20) according to claim 3, characterized in that, Some or all of the edge notches (48) are arranged aligned with the recesses (50) in the axial direction.

11. The radial shaft sealing ring (20) according to claim 4, characterized in that, Some edge notches (48) and some recesses (50), or all edge notches (48) and all recesses (50), are arranged offset relative to each other in the circumferential direction.

12. The radial shaft sealing ring (20) according to claim 5, characterized in that, All edge notches (48) and all recesses (50) are arranged with gaps between each other in the axial direction.

13. The radial shaft sealing ring (20) according to claim 9, characterized in that, The viscoelastic deformable material includes polytetrafluoroethylene or polytetrafluoroethylene composites.

14. A radial shaft seal (18) comprising a radial shaft sealing ring (20) according to any one of the preceding claims and a preload element (22), the preload element being arranged to be retained in a retaining groove (46) of a sealing lip (28) of the radial shaft sealing ring (20).

15. The radial shaft seal (18) according to claim 14, characterized in that, The recess (50) has such a radial depth (T) that the preload element (22) does not contact the bottom of the groove (52) in the region of the recess (50).

16. The radial shaft seal (18) according to claim 14, characterized in that, The preload element (22) is a tension spring or a compression spring.

17. A radial shaft seal assembly (10), comprising: - A shaft (12) and a machine component (14) surrounding the shaft (12), the shaft and the machine component being spaced apart from each other while forming a sealed gap (16) and movably arranged relative to each other about a motion axis (L); and - The radial shaft seal (18) according to any one of claims 14 to 16, wherein the radial shaft sealing ring (20) is dynamically and sealingly abutted against the sealing surface (40) of the shaft (12) or the machine part (14) in a pre-tightened manner by means of the pre-tightening element (22).

18. The radial shaft seal assembly (10) according to claim 17, characterized in that, The sealing lip (28) of the radial shaft sealing ring (20) does not overlap with the preload element (22) in the strictly radial direction in the region of the edge notch (48).

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