Slide ring and housing, and slide ring seal

Abstract

To provide a slide ring and a slide ring seal.SOLUTION: A slide ring (2) for a slide ring seal (40) of the present invention preferably comprises: a front side running surface (4) extending substantially in the radial plane of the slide ring (2); and, for a first seal (20) designed to seal the slide ring (2) against a housing or hub on one hand and support it axially and radially, a radially inner, preferably conical, first contact surface (6), more preferably a first contact surface (6) having a large cone angle. The slide ring (2) of the present invention further comprises a radially outer, second contact surface (12) for at least one second seal (22). The slide ring (2) preferably further comprises a radially outer, further third contact surface (16) for a further third seal (24).SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to sliding ring seals, which are known in particular for use in the running gear of construction machinery. Sliding ring seals, used for example in pumps and valves, are also known for sealing rotating shafts and axles. The present invention relates to sliding ring running gear seals used in the drive systems of excavators and caterpillars, and drive systems of bulldozers, as well as axle bearings of loaders and the like. [Background technology]

[0002] This type of sliding ring seal is used to protect the bearings of wheels and axles of construction and forestry machinery from wear caused by soil and mud. Sliding ring seals typically include two sliding rings with essentially flat, annular sliding surfaces that slide in contact with each other and overlap. Lubrication is available for each sliding surface. The sliding rings are typically held and pressed against each other by rubber or elastomeric bearings. The rubber bearings allow for slight axial and radial offsets and slight tilting of the sliding rings. The sliding rings may also be provided with anti-rotation guards to prevent the two sliding rings from rotating relative to their rubber bearings when they are tightly fitted together. The sliding ring bearings have good resistance to wear caused by soil, sand, and mud due to the smooth sliding surfaces and hard materials. However, problems exist in the rubber bearing area in that soil, sand, or mud, including clay and loam, can significantly restrict the axial and radial mobility of the seal. Additionally, internal and external pressures can shift the elastomer and / or adversely affect the surface pressure of the sliding ring.

[0003] Currently, there are known techniques for reinforcing the rubber bearing of the sliding ring, and also for using a rubber bearing with a special cross-sectional shape, but these are not sufficiently effective.

[0004] Sliding ring seals in running gear are at risk from mud accumulating in the gap between each sliding ring and the corresponding housing or shaft portion, which can lead to the sliding ring sticking to the housing or shaft portion depending on the viscosity and dryness of the mud. A sliding ring that is stuck and unable to move due to mud or deposits will not be able to provide uniform surface pressure on the running or sealing surfaces, resulting in the ingress of sand, soil, and mud between the running surfaces, corresponding to a significant increase in wear and ultimately leading to failure of the sliding ring seal and corresponding bearing.

[0005] Patent document 1 (DE 10 2008 036489) proposes increasing the resistance of sliding ring seals to the ingress of dirt and therefore the associated increased wear, and in this case discloses the use of a special seal geometry to protect the sliding ring seal from wear associated with dirt.

[0006] A similar solution for protecting sliding ring seals from the ingress of dirt is disclosed in DE 35 23 585 A1, in which again a special seal geometry is used. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] German Patent No. 10 2008 036489 [Patent Document 2] DE 3523585 A1 Summary of the Invention

[0008] Therefore, it is desirable to improve the sliding ring bearing of the running gear, and to improve the rubber sliding ring bearing of the sliding ring so that the ingress of dirt between the sliding ring and the assigned housing is prevented or at least made more difficult. Furthermore, it is desirable that the small outer elastomer be designed to be better protected against wear than before.

[0009] Sliding ring seals comprise sliding rings that slide against each other under lubricated conditions and are used in a variety of technical fields. Particularly noteworthy applications include construction machinery, agricultural vehicles, as well as dozers and crawlers, which are used in particularly abrasive environments. For example, the use of sliding ring seals is not appropriate for the axles of typical passenger cars, as conventional radial shaft seals are sufficient.

[0010] According to a first aspect of the present invention there is provided a sliding ring for a sliding ring seal having the features of the independent claims. Preferred embodiments are as set out in the dependent claims.

[0011] A sliding ring for such a sliding ring seal, particularly for a running device, preferably has a front running surface extending substantially in the radial plane of the sliding ring, which running surface is configured to slide on the running surface of a further sliding ring. In this case, the sliding ring further has a radially inner, preferably conical, first contact surface, more preferably a first contact surface with a large cone angle, for a first seal configured to seal the sliding ring against the housing or hub and support it axially and radially. The first sliding ring is provided with a first contact surface for centering and aligning the sliding ring with the housing or hub and for generating a contact pressure pressing the sliding ring against the opposing sliding ring. The first sliding ring is further provided with a radially outer second contact surface for at least one further second seal, which second contact surface is configured to abut against one or two seals. In a preferred embodiment of the sliding ring, the sliding ring further comprises a radially outer third contact surface, which is adapted to abut against a further third seal.

[0012] The sliding ring for the sliding ring seal can have a front running or sealing surface and a radially inner contact surface, preferably a conical contact surface with a large cone angle, for the first O-ring. The first O-ring seal seals the gap between the sliding ring and the housing or hub and also provides axial and radial support for the seal ring. In this case, the seal is considered a static seal even if the first O-ring is designed to allow slight axial movement, shift in the radial plane, and tilt relative to the radial plane relative to the sliding ring. The sliding ring according to the present invention has a radially outer sealing surface for the second O-ring. This O-ring is designed to seal the gap between the sliding ring and the housing or hub and prevent slush and mud from entering and hardening in this gap, which would result in the sliding ring being unable to move and the sliding, running, or sealing surfaces not being able to contact each other.

[0013] Conventional sliding ring seal designs are further supplemented in the present invention with O-rings, trapezoidal rings, diamond rings, X-rings, etc. to protect the gap between the sliding ring and the housing or hub portion from the ingress of dirt.

[0014] The seals are numbered consecutively, with the first seal always located radially inward of the slide ring to support and center it, the second seal always located radially outward of the slide ring to seal the gap between the slide ring and the housing or hub, and the third seal always located radially outward of the slide ring to additionally seal the gap between the slide ring and the housing or hub.

[0015] In the sliding ring embodiment, a radially inner contact surface configured to abut the first seal is further configured on the first O-ring, or the diamond ring, trapezoid ring, or Z-ring.

[0016] In an additional embodiment of the sliding ring, the radially outer second contact surface configured for the at least one further second seal is further configured to abut against at least one second O-ring and / or at least one second X-ring.

[0017] In another embodiment of the sliding ring, the radially outer third contact surface is configured to abut against the radially outer third seal and is further configured to abut against a third O-ring or a third X-ring.

[0018] In another additional embodiment of the sliding ring, the contact surfaces of the sliding ring are configured to abut against the first O-ring, the second O-ring, and more preferably the third O-ring, respectively. This embodiment relates to a sliding ring configured for use only with O-rings.

[0019] In an additional further embodiment of the sliding ring, the contact surface of the sliding ring is further preferably configured to abut against a first diamond or Z ring, a second X ring, and more preferably a third X ring, respectively. This embodiment relates to a sliding ring that is supported and centered from the inside by a Z ring or diamond ring, and further provided with an X ring to seal the gap between the housing or hub.

[0020] In a cross section along a plane containing the axis of rotation or axis of rotational symmetry of the sliding ring, the sliding ring has a substantially triangular cross-sectional shape, where one side is determined by a running surface lying substantially in a radial plane, a radially inner second side is determined by the contact surface of the first O-ring and a radially outer third side comprises the contact surface for the second O-ring.

[0021] It has been described that for the first O-ring a first contact surface is provided which "has a large cone angle". In this case, a large cone angle is understood to be a cone angle between 16° and 50°, preferably between 20° and 40°, and more preferably between 26° and 34°. In other words, this corresponds to half the cone angle or inclination angle, respectively (or half the cone angle, respectively) of the conical surface relative to the axis of rotation or axis of rotational symmetry, and is between 8° and 25°, preferably between 10° and 20°, and more preferably between 13° and 17°.

[0022] In the case of diamond seal or Z-seal embodiments, the radial contact surface for this seal type is formed substantially cylindrical, in which case an additional contact shoulder is required to also support the sliding ring in the axial direction.

[0023] In the exemplary embodiment of the sliding ring, the radially outer contact surface has an inclination angle of 0° to 3°, preferably 0.5° to 2.5°, and more preferably 1.0° to 2.0°, relative to the axis of rotation or axis of rotational symmetry of the sliding ring. This embodiment is directed to an embodiment in which the second O-ring cannot contribute, or can contribute only to a very limited extent, to the axial force applied to the sliding ring. In this case, the second O-ring abutting the radially outer contact surface substantially prevents sand, mud, slush, and other abrasive materials from reaching the area in which the sliding ring is supported and sealed by the first O-ring.

[0024] In a further exemplary embodiment of the sliding ring, the radially outer second and third contact surfaces have an inclination angle of 0° to 3°, preferably 0.5° to 2.5°, and even more preferably 1.0° to 2.0° relative to the axis of rotation or axis of rotational symmetry of the sliding ring. This embodiment is directed to an embodiment in which the second and third O-rings (or the respective X-rings) do not contribute, or can contribute only to a very limited extent, to the axial force applied to the sliding ring. In this case, the second and third O-rings or X-rings abutting the radially outer first and / or first and second contact surfaces substantially prevent sand, mud, slush, and other abrasive materials from reaching the area in which the sliding ring is supported and sealed by the first O-ring.

[0025] In another exemplary embodiment of the sliding ring, the radially outer contact surface has a cone angle of 16° to 50°, preferably 20° to 40°, and more preferably 26° to 34°. In other words, this corresponds to half the cone angle or inclination angle of the cone surface relative to the axis of rotation or axis of rotational symmetry, respectively, and is 8° to 25°, preferably 10° to 20°, and more preferably 13° to 17°. In this case, the two contact surfaces for the first and second O-rings are designed to center the sliding rings in a radial plane and press them axially against the opposing sliding rings. Contact surfaces with this type of cone angle are particularly suitable for O-ring seals, since the O-ring seals can roll between the contact surfaces as the sliding rings move relative to the housing or hub element. In this case, it is also possible to assume that the two O-rings have similar dimensions. This is because, due to their geometry, O-rings with larger cord thicknesses have a more uniform force distribution under load than O-rings with smaller cord thicknesses. O-rings with smaller cord thicknesses are less compressible than O-rings with larger cord thicknesses and made of the same material. In this case, to limit the effect of different O-ring dimensions, O-rings with similar or identical cord thicknesses can be used, so that a first O-ring with a larger absolute deformation capacity provides a corresponding O-ring with a similar lateral deformation capacity and prevents the ingress of dirt. A further solution can be envisioned: the use of O-rings made of different soft materials. In this case, the material of the first (inner) O-ring is significantly harder than the material of the second outer O-ring. According to current assumptions, the second outer O-ring has an elastic modulus at least twice as large and at most ten times larger, preferably at least three times as large and at most eight times as large, and even more preferably at least four times as large and at most six times as large, as the material of the second outer O-ring.

[0026] According to a further embodiment of the present invention, there is provided a sliding ring according to any one of the above-described embodiments, comprising a radially inner contact shoulder axially adjacent to the radially inner first contact surface. The axial sealing abutment is formed by the contact shoulder to increase axial compression of the seal. The shoulder prevents the seal ring from contacting the housing or hub component. In this case, the radially inner contact shoulder has a radial dimension that is 35% to 70%, preferably 40% to 60%, of the axial dimension of the inner contact surface. Only the radial and axial projections of the shoulder and contact surface are compared here. Preferably, the shoulder extends radially by a height that is approximately half the axial height of the radially inner first contact surface.

[0027] In an additional exemplary embodiment of the sliding ring, at least one radially outer contact shoulder is provided, each of which is axially adjacent to a radially outer contact surface. In this case, if two radially outer contact surfaces, i.e., a second radially outer contact surface and a third radially outer contact surface, are also present, two radially outer contact shoulders, i.e., a second radially outer contact shoulder and a third radially outer contact shoulder, may also be provided. In this case, the radially outer contact shoulder has a radial dimension that is 35% to 70%, preferably 40% to 60%, of the axial dimension of the outer contact surface. It has been determined that the contact shoulders should be formed with a height that is approximately half the width of the corresponding second or third contact surface.

[0028] In another embodiment of the sliding ring, the radially inner and outer contact surfaces of the sliding ring overlap in the axial direction by 40% to 100%, preferably 50% to 90%, and more preferably 60% to 80%. In this embodiment, it is determined that there is at least one radial plane that intersects both contact surfaces. In the assembled sliding ring seal, the first O-ring and the second O-ring are rather alternately arranged in the radial direction.

[0029] In this case, the axial overlap is considered with respect to the projection of the axial dimension of the contact surface onto the axis of rotation or axis of rotational symmetry, and this overlap is considered with respect to each projected shorter axial dimension. If an axial dimension is completely contained within a different axial dimension, each overlap is considered to be 100%. If half of the shorter axial dimension is contained within the longer axial dimension, the overlap is 50%.

[0030] In a further exemplary embodiment of the sliding ring, the radially inner and outer contact surfaces of the sliding rings overlap in the axial direction by 0% to 40%, preferably 5% to 35%, more preferably 10% to 30%. This embodiment relates to the situation where, in the assembled sliding ring seal, the first and second O-rings are alternately arranged in the axial direction.

[0031] According to a further embodiment of the invention, the sliding ring is provided with an anti-rotation guard in the form of at least one hole, at least one recess, and / or at least one protrusion, which preferably has a rotational symmetry of 180°, 120°, 90°, 72°, 60°, 45°, 36°, 30° to 10°. A sliding ring with a rotational symmetry guard has the advantage that the sliding ring can be assembled in several installation positions. A rotationally symmetrical anti-rotation guard also has a smaller effect on the sealing properties in response to radial shifts, tilts, or other deviations.

[0032] According to a further aspect of the present invention, there is provided a sliding ring seal service set comprising the above-mentioned sliding ring having a corresponding inner first seal, a corresponding outer second seal, and preferably an additional outer third seal, wherein the service set comprises two sliding rings further having two corresponding inner first seals, two corresponding outer second seals, and preferably two corresponding outer additional third seals.

[0033] According to a further aspect of the present invention, a sliding ring seal service set is provided for maintaining the sliding ring seal according to the present invention, particularly for replacing worn sliding rings and seal rings. Such a sliding ring seal service set includes the above-described sliding ring, a corresponding inner first seal, a corresponding outer second seal, and preferably an additional outer third seal. Similarly, a sliding ring seal service set is also envisioned that includes two sliding rings as described above, each of which includes two corresponding inner first seals, two corresponding outer second seals, and preferably two corresponding outer third seals. This is considered to be a suitable and marketable unit, since more sliding ring seals require maintenance than are manufactured anew. According to a further aspect of the present invention, a sliding ring seal is provided that includes at least one sliding ring as described above, each of which is held in a respective housing and / or hub component by at least two O-rings.

[0034] In a further exemplary embodiment, the sliding ring seal comprises an anti-rotation guard for the sliding seal, which prevents the sliding ring from rotating circumferentially within the housing and / or hub component. In this basic form, at least one sliding ring as described above is inserted into the sliding ring seal. The anti-rotation guard is particularly suitable when diamond-shaped, Z-shaped, trapezoidal or X-shaped ring seals are used.

[0035] The sliding ring seal preferably further comprises the first sliding ring and the second sliding ring as described above, the first sliding ring and the second sliding ring contacting each other at their respective running surfaces, and the first and second sliding rings are retained in the respective housing and hub components by at least two O-rings. In this embodiment, two sliding rings as described above are used in the seal gap.

[0036] In a further embodiment of the sliding ring seal, the first, or inner, O-ring has a chord thickness that is 1.5 to 3 times, preferably 2 to 2.7 times, and more preferably 2.2 to 2.5 times, the chord thickness of the second, or outer, O-ring. In this case, the second O-ring essentially functions as a gap seal to prevent dirt, mud, sand, and slush from penetrating the seal gap and reaching the first O-ring. This embodiment is particularly suitable when the sliding ring seal is loaded with axial forces. This allows a thinner O-ring to seal the seal gap even when greater axial movement occurs, because the O-ring is not or cannot be particularly strongly loaded in the radial direction.

[0037] In another exemplary embodiment of the sliding ring seal, the first (inner) sliding ring has a chord thickness that is 0.7 to 1.5 times, preferably 0.8 to 1.3 times, and more preferably 0.9 to 1.1 times, greater than the chord thickness of the second (outer) sliding ring. In this case, the two O-rings have approximately the same size, and both O-rings contribute to applying the contact pressure of the sliding rings in the sliding ring seal and to centering the sliding rings to approximately the same extent. In this case, the second outer O-ring is made stronger to separate the centering and sealing, as well as to keep contaminants away from the first O-ring. In this case, the two O-rings can have a smaller chord thickness than the inner O-ring in a conventionally configured sliding ring seal.

[0038] In other embodiments of the sliding ring seal, the sliding ring seal is a chassis or running gear sliding ring seal of an agricultural machine or agricultural vehicle, or construction machine, or crawler or tracked vehicle, respectively. Sliding ring seals are needed in technical fields that do not allow the use of conventional radial shaft seals due to excessive wear, especially when abrasive media such as sand, mud, slush, or soil are located in the surrounding area.

[0039] The present invention will now be described with reference to schematic drawings of preferred embodiments. [Brief explanation of the drawings]

[0040] [Figure 1] FIG. 1 is a cross-sectional view showing a conventional sliding ring seal. [Figure 2] 1 is a cross-sectional view showing a first embodiment of a sliding ring seal according to the present invention. [Figure 3] FIG. 3 is a cross-sectional view showing a further embodiment of a sliding ring seal according to the present invention. [Figure 4] FIG. 4 is a cross-sectional view showing a further embodiment of a sliding ring seal according to the present invention. [Figure 5] FIG. 5 is a cross-sectional view showing a further embodiment of a sliding ring seal according to the present invention. [Figure 6] FIG. 6 is a cross-sectional view showing a further embodiment of a sliding ring seal according to the present invention. [Figure 7] FIG. 7 is a cross-sectional view showing a further embodiment of a sliding ring seal according to the present invention. [Figure 8] FIG. 8 is a cross-sectional view showing a further embodiment of a sliding ring seal according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0041] Hereinafter, the same or similar reference numerals will be used in the description and drawings to denote the same or similar components and elements.

[0042] FIG. 1 shows a cross-sectional view of a conventional sliding ring seal 98 that can be used in agricultural machinery. The conventional sliding ring seal 98 is disposed between a housing 44 and a shaft or hub element 46. The housing 44 and the shaft or hub element 46 each have a recess, within which a conventional sliding ring 42 is disposed. An O-ring 52 is clamped between the conventional sliding ring 42 and the recess, centering the conventional sliding ring 42 relative to the recess and pressing the two conventional sliding rings 42 together. The wavy lines indicate a shortened distance from the axis of rotation or axis of rotational symmetry 60, represented by the dash-dotted line 48. In this case, the O-ring 52 is disposed radially outward of the conventional sliding ring 42. When the shaft or hub rotates, the conventional sliding rings 42 can slide against each other on their contacting running surfaces. The conventional sliding rings 42 are constructed of a wear-resistant material. In this type of seal, the running surfaces of the conventional sliding rings 42 must be lubricated to prevent them from heating and fusing. The O-rings 52 center the conventional sliding rings 42 and press them together. If a load occurs that causes the shaft or hub 46 to bend or shift axially relative to the housing 44, the suspension via the O-rings 52 can compensate and prevent the two conventional sliding rings 42 from separating from each other and therefore preventing leakage of the sliding ring seal. However, the conventional configuration has the disadvantage that contaminants can reach between the O-rings 52 and the respective contact surfaces, which can result in axial shifting of the O-rings and / or limited axial mobility of the sliding rings.

[0043] 2 shows a cross-sectional view of a first embodiment of a sliding ring seal 40 according to the present invention. The sliding ring seal 40 is again disposed between a housing 44 and a shaft or hub element 46. The housing 44 and the shaft or hub element 46 are each provided with a recess, which in the illustrated embodiment is annularly configured. Each recess has two, namely, radially outer and radially inner contact surfaces 48, 50 for seals 20, 22 in the form of O-rings 80 / 82.

[0044] In the illustrated embodiment, the first seal 20, configured as a first O-ring 80 and having a cord thickness substantially corresponding to that of an O-ring of a conventional sliding ring seal, abuts against the radially inner contact surface 48. Due to its dimensions, the first O-ring 80 serves to radially center the sliding ring 2 and to press it axially against the opposing sliding ring 2. In contrast to the conventional sliding ring seal 98 in FIG. 1, the seal 20 or O-ring 80 is arranged radially further inward. Compared to FIG. 1, the profile of the sliding ring is inverted, so that the larger O-ring supports the sliding ring from the inside, rather than from the outside as in FIG. 1. The first seal 20, i.e., the first O-ring 80, of the sliding ring 2 according to the present invention is arranged between the inner ring contact surface 48 of the recess and the inner contact surface 6 of the sliding ring 2. The first seal 20 or first O-ring 80 functions to center the sliding ring 2 and generate a force to press its sliding, running, or sealing faces 4 together. For centering purposes, the contact surface of the first seal or first O-ring 80 has a conical shape.

[0045] According to the invention, the gap is closed by a further second seal 22 arranged radially outward, which in the illustrated embodiment is configured as a second O-ring 82 and essentially only seals the gap. In the second embodiment in FIG. 2, the sliding ring 2 is provided with an outer seal contact surface 12 for this purpose, and the shaft or hub component 46 is provided with an outer seal contact surface 48 in a recess, between which a second outer seal, i.e., an O-ring 82, is clamped. Since the outer seal contact surface 12 of the sliding ring and the outer seal (or O-ring) contact surface 46 of the shaft or hub component 44 are substantially cylindrical or slightly conical (less than 2°), the second outer seal 22, i.e., the second outer O-ring 82, contributes substantially little to increasing the contact force between the two sliding rings 2. Due to the shape of the contact surfaces, the second seal 22 or the second O-ring 82 may only slightly contribute to centering the sliding rings. In the illustrated embodiment, the outer contact surface 12 of the sliding ring and the outer contact surface of the housing 44 or shaft / hub 46 are further provided with contact shoulders which axially secure the second outer seal or O-ring 82 and prevent it from slipping inward or outward through the gap.

[0046] The inner seal contact surface 6 of the sliding ring terminates in a contact shoulder 14 in the direction of the seal face. The second seal 22 or second O-ring 82 reduces or prevents the ingress of dirt into the gap, and the function of the sliding ring seal can be maintained for a longer period of time due to the axial mobility of the sliding ring maintained even in the case of heavy mud blockage. Wear of the second seal 22 or second O-ring 82 can be further reduced by a freely selectable labyrinth design or a seal offset axially backward or inward. In Figure 2, the position of the axis corresponds to that shown in Figure 1, and is again considered to lie outside the drawing.

[0047] Figure 3 shows an embodiment similar to that of Figure 1, in which a third seal 24 or third O-ring 84 is positioned adjacent to the second seal 22 or second O-ring 82. In this case, the third O-ring functions as a series-connected O-ring and provides an enhanced sealing effect.

[0048] FIG. 4 shows a modification of the embodiment of FIG. 3, in which the second and third seals 22 and 24 or the second and third O-rings 82 and 84 are axially separated from each other by separate webs.

[0049] FIG. 5 shows an embodiment in which the second and third seals 22, 24 or the second O-ring 82 and the third O-ring 84 are separated from each other not only axially but also radially by a step.

[0050] 6 shows an embodiment in which the first seal 20 configured as an O-ring 80 and the second seal 22 configured as a second O-ring 82 have more similar cord thicknesses. In this case, all of the force to be applied can also be applied, at least in part, by the second O-ring 82.

[0051] 7 shows an embodiment in which the first O-ring 20 and the second O-ring 22 have substantially the same cord thickness, in which case all forces to be applied can be divided evenly between the first O-ring 22 and the second O-ring 22.

[0052] In this case, the cord thickness of the O-ring can be smaller than in conventional sliding rings, as shown for example in Figure 1. The sliding ring in the illustrated embodiment is symmetrical about the coaxial cylindrical jacket symmetry axis, again exhibiting rotational or spherical symmetry. The two O-rings in Figure 4 are offset from each other in the radial direction. The sealing and contact surfaces are preferably located on the dirty side.

[0053] FIG. 8 shows an embodiment similar to that of FIG. 4, in which instead of an O-ring, a diamond or Z-seal ring 90 is used as the first seal 20, with X-rings 92, 94 used as the second and third seals. [Explanation of symbols]

[0054] 2 sliding rings 4 Sliding surface, running surface or sealing surface of sliding ring 6 Inner primary seal contact surface of sliding ring 8 Contact shoulder of the seal contact surface on the inside of the sliding ring 12 Radially outer second seal contact surface of the sliding ring 14 Contact shoulder of seal contact surface on the outside of sliding ring 16 Radially outer third seal contact surface of the sliding ring 18 Third seal contact surface on the outside of the sliding ring 20 First inner seal 22 Second outer seal 24 Outer third seal 40 Sliding ring seal according to the present invention 42 Conventional sliding ring 44 Housing 46 Hub / Shaft 48 Inner O-ring contact surface in recess 50 Outer O-ring contact surface in recess 60 Axis of rotation / axis of rotational symmetry 70 Conventional sliding ring seal 80 Inner first O-ring 82 Outer second O-ring 84 Outer third O-ring 90 Inner first diamond ring or Z ring 92 Outer 2nd X Ring 94 Outer 3rd X Ring

Claims

1. A sliding ring (2) for a sliding ring seal (40), preferably comprising a front running surface (4) extending substantially in a radial plane of said sliding ring (2), and a radially inner, preferably conical, first contact surface (6), more preferably with a large cone angle, for a first seal (20) designed on the one hand to seal and support said sliding ring (2) axially and radially relative to a housing or hub, the sliding ring (2) further comprises a radially outer second contact surface (12) for at least one second seal (22); Sliding ring (2), characterized in that the sliding ring (2) preferably further comprises a radially outer further third contact surface (16) for a further third seal (24).

2. A sliding ring (2) according to claim 1, First, - the radially inner contact surface (6) adapted to bear against the first seal (20) is adapted to bear against a first O-ring (80) or diamond ring or Z-ring seal (90); Secondly, the radially outer second contact surface (12) against which at least one further second seal is adapted to bear is adapted to bear against at least one second O-ring (82) and / or at least one second X-ring (92); Third, - the sliding ring preferably additionally comprises a third radially outer contact surface (16) adapted to bear against the third radially outer seal (24), said third contact surface (16) being adapted to bear against a third O-ring (84) or a third X-ring (94); the contact surfaces (6, 12, 16) of the sliding ring (2) are preferably configured to abut against the first O-ring (80), the second O-ring (82), and more preferably the third O-ring (84), respectively; or The contact surfaces (6, 12, 16) of the sliding ring (2) are preferably configured to abut against the first diamond or Z ring (90), the second X ring (92), and more preferably the third X ring (94), respectively.

3. 3. The sliding ring (2) according to claim 1 or 2, wherein the radially inner conical contact surface (6) has an inclination angle of 8° to 25°, preferably 10° to 20°, more preferably 13° to 17°.

4. 4. The sliding ring (2) according to claim 1, 2 or 3, wherein the radially outer second contact surface (12) has an inclination angle of 0° to 3.0°, preferably 0.5° to 2.5°, and more preferably 1.0° to 2.0°, and wherein the radially outer second contact surface (12) and the radially outer third contact surface (16) each preferably have an inclination angle of 0° to 3.0°, preferably 0.5° to 2.5°, and more preferably 1.0° to 2.0°, or wherein the radially outer contact surface (12) has an inclination angle of 8° to 25°, preferably 10° to 20°, and more preferably 13° to 17°.

5. 5. The sliding ring (2) according to claim 1, characterized in that a radially inner contact shoulder (8) is provided, the radially inner contact shoulder (8) being axially outer adjacent to the radially inner contact surface (6), the radially inner contact shoulder (8) having a radial dimension which is 35% to 70%, preferably 40% to 60%, of the axial dimension of the inner contact surface; and / or a radially outer contact shoulder (14) is provided, the radially outer contact shoulder (14) being axially outer adjacent to the radially outer contact surface (12), the radially outer contact shoulder (14) having a radial dimension which is 35% to 70%, preferably 40% to 60%, of the axial dimension of the outer contact surface (12).

6. 6. The sliding ring (2) according to any one of claims 1 to 5, characterized in that the radially inner contact surface (6) and the radially outer contact surface (12) of the sliding ring (2) overlap in the axial direction by 40% to 100%, preferably 50% to 90%, more preferably 60% to 80%.

7. 7. The sliding ring (2) according to claim 1, wherein the radially inner contact surface (6) and the radially outer contact surface (12) of the sliding ring (2) overlap in the axial direction by 0% to 40%, preferably 5% to 35%, more preferably 10% to 30%.

8. A sliding ring seal service set comprising a sliding ring according to any one of claims 1 to 7, a corresponding inner first seal, a corresponding outer second seal and preferably an outer additional third seal, 8. A sliding ring seal service set comprising two sliding rings according to any one of claims 1 to 7, each having two corresponding inner first seals, two corresponding outer second seals, and preferably two corresponding outer third seals.

9. A sliding ring seal (40) comprising a sliding ring (2) according to any one of claims 1 to 7 or a service set according to claim 8, wherein the at least one sliding ring (2) is held in each housing and hub component (44, 46) by two seals, i.e., an inner first seal and an outer second seal, preferably O-rings (20, 22), and the sliding ring seal (40) is preferably provided with an anti-rotation protection, and the sliding ring a sliding ring seal (40) preferably comprising a first sliding ring (2) according to any one of claims 1 to 7 and a second sliding ring (2) according to any one of claims 1 to 7, wherein the first sliding ring (2) and the second sliding ring (2) are in contact with each other at their respective running surfaces (4), and the first and second sliding rings (2) are held in their respective housing and hub components (44, 46) by at least two seals (20, 22).

10. 10. The sliding ring seal (40) according to claim 9, wherein the first inner seal (20) and the second outer seal (22) are formed by first and second O-rings (80, 82), respectively, and the first inner O-ring (80) has a chord thickness that is 1.5 to 3 times, preferably 2 to 2.7 times, and more preferably 2.2 to 2.5 times, greater than the chord thickness of the second outer O-ring (22).

11. 11. A sliding ring seal (40) according to claim 10, characterized in that each of the sliding rings of the sliding ring seal comprises an outer third seal (24), the outer second seal (22) and the outer third seal (24) being formed by a second or third O-ring (82, 84), respectively, and the outer third O-ring (84) has a chord thickness that is 0.7 to 1.3 times, preferably 0.8 to 1.2 times, and more preferably 0.9 to 1.1 times, greater than the chord thickness of the outer second O-ring (22).

12. 10. The sliding ring seal (40) according to claim 9, wherein the first inner seal (20) and the second outer seal (22) are formed by first and second O-rings (80, 82), respectively, and the first inner O-ring (80) has a chord thickness that is 0.7 to 1.5 times, preferably 0.8 to 1.3 times, and more preferably 0.9 to 1.1 times, greater than the chord thickness of the second outer O-ring (22).

13. 13. A sliding ring seal (40) according to claim 11 or 12, characterized in that the sliding ring seal (40) is a sliding ring seal for a chassis or running gear of an agricultural machine or agricultural vehicle, or a construction machine, or a crawler or tracked vehicle, respectively.

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