CA2093680A1 - Shaft seal - Google Patents
Shaft sealInfo
- Publication number
- CA2093680A1 CA2093680A1 CA 2093680 CA2093680A CA2093680A1 CA 2093680 A1 CA2093680 A1 CA 2093680A1 CA 2093680 CA2093680 CA 2093680 CA 2093680 A CA2093680 A CA 2093680A CA 2093680 A1 CA2093680 A1 CA 2093680A1
- Authority
- CA
- Canada
- Prior art keywords
- axis
- rotation
- recess
- shaft seal
- seal according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3404—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal
- F16J15/3408—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal at least one ring having an uneven slipping surface
- F16J15/3412—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal at least one ring having an uneven slipping surface with cavities
- F16J15/3416—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal at least one ring having an uneven slipping surface with cavities with at least one continuous groove
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mechanical Sealing (AREA)
Abstract
ABSTRACT
A shaft seal for a rotating shaft includes a counter ring having an axial end surface of essentially annular shape which extends essentially perpendicular to the axis of rotation and a sliding ring which is resiliently forced against the counter ring end surface. The counter ring end surface has an axial recess which is positioned in that portion of the counter ring end surface which is closer to the axis. Crystalline contaminants are removed from the mutually contacting surfaces of the sliding and counter rings which results in a longer service period and improved operating characteristics of the shaft seal.
A shaft seal for a rotating shaft includes a counter ring having an axial end surface of essentially annular shape which extends essentially perpendicular to the axis of rotation and a sliding ring which is resiliently forced against the counter ring end surface. The counter ring end surface has an axial recess which is positioned in that portion of the counter ring end surface which is closer to the axis. Crystalline contaminants are removed from the mutually contacting surfaces of the sliding and counter rings which results in a longer service period and improved operating characteristics of the shaft seal.
Description
2~93~80 1 -- , SHAFT SEAL
The invention relates to shaft seals for rotatable shafts which in~lude a coun~er rin8 having an axial end surface of annular shape that extends essentially perpendicular to the axis of ro~ation, and a sliding ring which has an annular front surface and is resiliently forced against ~he end surface of the counter ring so that the sliding ring front surface ~ontacts the counter ring end surface.
Shaft seals of this type are known in the art and are used, for example, for the sealing of coolant pump shafts. The counter ring rotates together with the shaft, while the sliding ring i9 pOgitiOIled -~ relatively stationary in a housing together with a seal of elastomeric material commonly usedO Conse~uently, the sliding ring front surface and the counter ring end surface rub against each other upon rotation of the - 15 shaft. However, parts of the medium to be sealed escape because of the pressure difference between medium and atmosphere and as the temperature of the medium increases, partly due to friction, evaporate leaving behind the crystallized residues of products, for example silicone o~ide, which are initially found in the medium to be sealed. Consequently, during use of such a shaft seal, crystalline products accumulate on the mutually ~- contacting and rubbing surfaces of the sliding ring and the counter ring, where they may lead to damage and/or destruction of these surfaces.
It is now an object of the invention to provide a shaft seal of the above described general type wherein contaminants which crystallize in ~-~ 25 the region of the mutually contacting and rubbing surfaces of the sliding ~-- ring and the counter ring are re~oved therefrom and wherein intrusion of - contaminant par~icles back into that region is substantially prevented.
` Furthermore, it is another ob~ect to cool the mutually contacting surfaces so that contamination by temperature/pressure dependent crystallization of parts of the medium is substantially reduced or prevented.
This is achieved ~n a shaft seal wherein the end surface of the counter ring is provided with an axial recess which is positioned in that portion of the end surface which ~s closer to the axis of rotation.
:
. ; : : . : ~ :
~, ~ ,. . ~ . .
- -, ,: -, ;., -- 20~36~ ~
Accordlngly, the invention provides a sha~t ~eal for a shaft rotatable in a housing about an axis of rotation, including a counter ring having an axial end surface of annular shape which extends perpendicular to the axis of rotatlon, and a slLding ring which is resiliently forced against the counter ring end surface. The counter ring end surface has an axial recess in that portion which is closer to the axis of rotation.
It is an advantage of such a shaft seal that the crystalline deposits are transported immedia~ely after their formation fro~ the region of the mutually contacting rubbing surfaces of the ~liding ring and the counter ring to the recess. This results in a markedly extended service period and good operating characteristics of the shaft Qeal.
In~rusion of contaminants back into the region of the rubbing surfaces is also substantially prevented.
`~ 15 In a preferred embodiment, the annular recess is positioned in a portion of the sliding ring front surface which extends from the radius ~ of the radially inner surface of the counter ring1 which is opposite the i~j axis, up to the annular median of the sliding ring. This construction guarantees a good sealing radially outward of the annular median of the sliding ring which is exposed to the medium to be sealed. Furthermore, the mutually contacting and rubbing surfaces of sliding ring and counter ring are sufficiently supported on each other to substantially prevent canting and increased wear. In this embodiment, the crystalline contaminants can be kept away from the mutually contacting and rubbing surfaces and mostly accumulate in form of a film on those portions of the ; sliding ring front surface which are not in contact with other parts.
On the side remote from the axisJ the recess ls preferably defined by a conical surface which surrounds the axis and the diameter of which increases towards the sllding ring. It iB an advantage of a counter ring ~/ 30 of such construction that it is economically and especially easily manufactured. Freshly crystallized contaminants are especially easily removed in this embodiment from the region of the mutually contacting and rubbing surfaces whereby both operating characteristics and service period are improved. The conical surface preferably encloses with the `~ 35 axis an angle of 8.75 to 45. It is an advantage of this preferred construction of the recess that during rotation of the counter ring, 2093~8~
crystalline particles are no longer pulled back into the gap between the mutually contacting parts which rotate relative to each other, since the radially outer surface of the recess is essentially perpendicular to ~he sliding ring front surface.
In another preferred embodiment, the recess in the counter ring i9 a groove which completely surrounds the axis of rotation. The recess preferably surrounds the axis of rotation at a constant radial distance.
- It is an advantage of this embodiment that installation of the shaft seal and especially the counter ring used ~s especially simplified and so is the manufacture of the counter ringO Crystalline contaminants accumulate in the groove.
In another preferred embodiment~ the recess surrounds the axis at a continuously changing radial distance. The recess may be elyptical or helical, or may be circular but eccentrical to the axis. These constructions also provide for the transport of contaminants from the mutually contacting and rubbing surfaces of the sliding and counter rings to the recess for deposit therein. Thusj in this embodiment deposits which are enclosed in the region of the rubbing surfaces no longer dig further into the rubbing suraces and, therefore, also do no longer ~- 20 contribute to premature failure of the shaft seal or to impairment of its `~ use characteristics. Recesses which are continuous in circumferential . ::
direction are relatively easily manufactured. Thus, the shaft seal is economically manufactured and at low cost. The recess may be cut in at least one circumferential location by the radially inner surface of the sliding ring. Furthermore, to achieve a further improved removal of the undesired crystalline deposits from between the sliding ring and the `~ counter ring, the recess is preferably constructed so that it is cu~ at several circumferential locations by the radially inner surface of the sliding ring. On the side remote from the axis of rotation, the recess is preferably defined by a surface which extends essentially parallel to the axis. It is an advantage of this embodiment that the crystalline deposits are not pulled into the gap between sliding ring and counter ring upon rotation of the counter ring during the intended use of the shaft seal, and that intrusion of the unwanted components is reliably prevented. The recess may be provided in at least one circumferential location with a radially outwardly protruding enlargement :
- ~ .
2~3~8~
of its profile. These pocket like enlargements are provided for the storage of deposits in order to reliably remove them from the region of the mutually contacting and rubbing surfaces. It i~ thereby an advantage that between the enlargements the recess may be cons~ructed relatively S narrow 90 that the rubbing surfaces can be enlarged, the surface pressure better distributed and the wear reduced correspondingly. Preferably three circumferentially evenly distributed radlally outwardly protruding enlargements of the recess are used. Cooling o~ the rubbing surfaces is also achieved wi~h this embodiment whereby temperature and pressure dependent crystallization is prevented or at least reduced. In direction parallel to the axis of rotation, the enlargements preferably have an essentially semi-circular profile. It is an advantage of this construction that the crystalline deposits are continuously removed from the recess since the removal of the depo~its is not hindered by sharp edges at the enlargements.
In a further preferred embodiment, the counter ring is made of ceramic or sinter materials and the rubbing or front surface of the sliding ring at least partly overlaps the recess in at least one circumferential location. It is hereby an advantage that the remaining partial opening between the rubbing surface of the sliding ring and the recess is sufficiently large for most applications to keep the crystalline deposits away from the region of the rubbing surfaces while - compact dimensions of the shaft seal in radial direction are achieved.
The area of contact between the slidlng ring and the counter ring is there~y sufficiently large to pre~ent canting during the intended use.
.
The present invention will now be further described in the followlng by way of a preferred embodiment and with reference to the attached drawlngs, which in some cases show the components of interest in schematic illustration.
Figure 1 is a cross section through a shaft seal in accordance with the invention; and Figures 2 to 10 respectively illustrate preferred embodiments of counter rings for use in a shaft seal as shown in Figure 1.
Figure 1 illustrates a shaft seal 15 for a shaft 2 ~hich is rotatable in relation to a housing 12 around an axis 1. The shaft seal 15 includes a counter ring 3 which has an annular, axial end surface 4 2~9~6~
that extends perpendicular to the æis 1. A sliding ring 5 is forced by a helical spring 13 against the counter ring 3J so ~hat a front surface 14 of the sliding ring 5 contacts the end surface 4 of the counter ring 3. The counter ring 3 is fixed to the axis 1 and rotatable therewith and the sliding ring 5 is mounted in the housing 12. Thus, durin~ the ; intended use, the sliding ring 5 and the counter ring 3 rota~e relative to each other and rest against each other along their mutually contacting front and end surfaces 14 and 4 which rub againsS each other. The end ~ surface 4 of the counter ring 3 has an axial recess 6, which in radial - 10 direction is located in at least one portion of the end surface 4 that does not extend farther than the annular median of the sliding ring 5.
Silicone oxide crystals depo~ited at elevated temperatures on the radially inward surface of the sliding ring 5 are thereby kPpt away from ~: the region of the mutually contacting rubbing surfaces of the sliding and counter rings 5 and 3 and are reliably prevented from entering into that region. This construction provides for excellent operating characteristics and an extended service period. Deposits accumulate in ; the recess 6 of the counter ring 3 and along the radially inner surface 11 of the sliding ring 5.
; 20 Counter rings which have differently shaped axial recesses 6 areillustrated in the following Figures 2 to 10. The sliding ring 5 which during the intended use contacts the respectlve counter ring is indicated in broken lines. The counter ring 3 shown in Figure 2 is provided with a recess 6 in form of contlnuous groove 9 which surrounds the axis 1 at a constant radial distance. The groove may have a rectangular or semi-circular cross section.
Figure 3 shows a counter ring 3 which essentially corresponds to the counter ring of Figure 2 whereby the recess is a cut-out provided radially inwardly of the rubbing or front surface of the sliding ring 5.
A counter ring 3 of such construction is especially easily and ; economically nanufactured.
In Figures 4 and 5, the recesses 6 surround the axis 1 at a constantly changing radial distance. In a circumferential segment of the counter rlng end surface 4, the recesses 6 contact the front surface of the sliding ring 5 and at least par~ly overlap therewith. Contaminants present in the region of the mutually contacting rubbing surfaces .
.
.. ~ . : . . .:
2~3~80 are reliably removed with this construction whereby a long service perlod is guaranteed.
The recesses 6 of the counter rings respectively illustrated in Figures 6 and 7 have radially outwardly protruding enlargements 10 which are positioned at three circumferentially evenly distrlbuted locations.
~ As mentioned in relation to Figures 2 and 3, the recesses 6 may have a ; rectangular or semi circular cross section. The recesses 6 are positioned radially inwardly of the rubbing or front surface of ~he sliding ring S, whereby the rubbing surface of the sllding ring 5 is only in contact with the radially outwardly protruding enlargements of the ;, respective recess.
In Figure 8, the recess is eccentrically positioned in relation to the rubbing surface of the sliding ring 5 in such a way that it is cut in one circumferential location by the radially inner wall of the counter ring which is directed towards the axis 1.
Figure 9 shows a counter ring 3 which along its inner circumference ` has three radially outwardly protruding enlargements 10 of conical shape, , ,.!
wherein contaminants can be received and kept away Erom the rubbing surfares of the sliding ring 5 and the counter ring 3. The inner diameters of the sliding ring 5 and the counter ring 3 are identical in this embodiment.
Figure 10 shows a counter ring 3 which has radially outwardly protruding enlargements 10 in form of a groove that respectively extends over the whole axial length of the counter ring 3. This embodiment is advantageous over the embodimen~ of Figure 9, since at the enlargements 10 the rubbing surfaces of the sliding ring 5 and the counter ring 3 contact at right angles and not at an angle of 45 as illustrated in Figure 9. With this construction according to Figure 10, the rubbing surfaces of the sliding ring 5 and the counter ring 3 are better protected from contamination.
~'
The invention relates to shaft seals for rotatable shafts which in~lude a coun~er rin8 having an axial end surface of annular shape that extends essentially perpendicular to the axis of ro~ation, and a sliding ring which has an annular front surface and is resiliently forced against ~he end surface of the counter ring so that the sliding ring front surface ~ontacts the counter ring end surface.
Shaft seals of this type are known in the art and are used, for example, for the sealing of coolant pump shafts. The counter ring rotates together with the shaft, while the sliding ring i9 pOgitiOIled -~ relatively stationary in a housing together with a seal of elastomeric material commonly usedO Conse~uently, the sliding ring front surface and the counter ring end surface rub against each other upon rotation of the - 15 shaft. However, parts of the medium to be sealed escape because of the pressure difference between medium and atmosphere and as the temperature of the medium increases, partly due to friction, evaporate leaving behind the crystallized residues of products, for example silicone o~ide, which are initially found in the medium to be sealed. Consequently, during use of such a shaft seal, crystalline products accumulate on the mutually ~- contacting and rubbing surfaces of the sliding ring and the counter ring, where they may lead to damage and/or destruction of these surfaces.
It is now an object of the invention to provide a shaft seal of the above described general type wherein contaminants which crystallize in ~-~ 25 the region of the mutually contacting and rubbing surfaces of the sliding ~-- ring and the counter ring are re~oved therefrom and wherein intrusion of - contaminant par~icles back into that region is substantially prevented.
` Furthermore, it is another ob~ect to cool the mutually contacting surfaces so that contamination by temperature/pressure dependent crystallization of parts of the medium is substantially reduced or prevented.
This is achieved ~n a shaft seal wherein the end surface of the counter ring is provided with an axial recess which is positioned in that portion of the end surface which ~s closer to the axis of rotation.
:
. ; : : . : ~ :
~, ~ ,. . ~ . .
- -, ,: -, ;., -- 20~36~ ~
Accordlngly, the invention provides a sha~t ~eal for a shaft rotatable in a housing about an axis of rotation, including a counter ring having an axial end surface of annular shape which extends perpendicular to the axis of rotatlon, and a slLding ring which is resiliently forced against the counter ring end surface. The counter ring end surface has an axial recess in that portion which is closer to the axis of rotation.
It is an advantage of such a shaft seal that the crystalline deposits are transported immedia~ely after their formation fro~ the region of the mutually contacting rubbing surfaces of the ~liding ring and the counter ring to the recess. This results in a markedly extended service period and good operating characteristics of the shaft Qeal.
In~rusion of contaminants back into the region of the rubbing surfaces is also substantially prevented.
`~ 15 In a preferred embodiment, the annular recess is positioned in a portion of the sliding ring front surface which extends from the radius ~ of the radially inner surface of the counter ring1 which is opposite the i~j axis, up to the annular median of the sliding ring. This construction guarantees a good sealing radially outward of the annular median of the sliding ring which is exposed to the medium to be sealed. Furthermore, the mutually contacting and rubbing surfaces of sliding ring and counter ring are sufficiently supported on each other to substantially prevent canting and increased wear. In this embodiment, the crystalline contaminants can be kept away from the mutually contacting and rubbing surfaces and mostly accumulate in form of a film on those portions of the ; sliding ring front surface which are not in contact with other parts.
On the side remote from the axisJ the recess ls preferably defined by a conical surface which surrounds the axis and the diameter of which increases towards the sllding ring. It iB an advantage of a counter ring ~/ 30 of such construction that it is economically and especially easily manufactured. Freshly crystallized contaminants are especially easily removed in this embodiment from the region of the mutually contacting and rubbing surfaces whereby both operating characteristics and service period are improved. The conical surface preferably encloses with the `~ 35 axis an angle of 8.75 to 45. It is an advantage of this preferred construction of the recess that during rotation of the counter ring, 2093~8~
crystalline particles are no longer pulled back into the gap between the mutually contacting parts which rotate relative to each other, since the radially outer surface of the recess is essentially perpendicular to ~he sliding ring front surface.
In another preferred embodiment, the recess in the counter ring i9 a groove which completely surrounds the axis of rotation. The recess preferably surrounds the axis of rotation at a constant radial distance.
- It is an advantage of this embodiment that installation of the shaft seal and especially the counter ring used ~s especially simplified and so is the manufacture of the counter ringO Crystalline contaminants accumulate in the groove.
In another preferred embodiment~ the recess surrounds the axis at a continuously changing radial distance. The recess may be elyptical or helical, or may be circular but eccentrical to the axis. These constructions also provide for the transport of contaminants from the mutually contacting and rubbing surfaces of the sliding and counter rings to the recess for deposit therein. Thusj in this embodiment deposits which are enclosed in the region of the rubbing surfaces no longer dig further into the rubbing suraces and, therefore, also do no longer ~- 20 contribute to premature failure of the shaft seal or to impairment of its `~ use characteristics. Recesses which are continuous in circumferential . ::
direction are relatively easily manufactured. Thus, the shaft seal is economically manufactured and at low cost. The recess may be cut in at least one circumferential location by the radially inner surface of the sliding ring. Furthermore, to achieve a further improved removal of the undesired crystalline deposits from between the sliding ring and the `~ counter ring, the recess is preferably constructed so that it is cu~ at several circumferential locations by the radially inner surface of the sliding ring. On the side remote from the axis of rotation, the recess is preferably defined by a surface which extends essentially parallel to the axis. It is an advantage of this embodiment that the crystalline deposits are not pulled into the gap between sliding ring and counter ring upon rotation of the counter ring during the intended use of the shaft seal, and that intrusion of the unwanted components is reliably prevented. The recess may be provided in at least one circumferential location with a radially outwardly protruding enlargement :
- ~ .
2~3~8~
of its profile. These pocket like enlargements are provided for the storage of deposits in order to reliably remove them from the region of the mutually contacting and rubbing surfaces. It i~ thereby an advantage that between the enlargements the recess may be cons~ructed relatively S narrow 90 that the rubbing surfaces can be enlarged, the surface pressure better distributed and the wear reduced correspondingly. Preferably three circumferentially evenly distributed radlally outwardly protruding enlargements of the recess are used. Cooling o~ the rubbing surfaces is also achieved wi~h this embodiment whereby temperature and pressure dependent crystallization is prevented or at least reduced. In direction parallel to the axis of rotation, the enlargements preferably have an essentially semi-circular profile. It is an advantage of this construction that the crystalline deposits are continuously removed from the recess since the removal of the depo~its is not hindered by sharp edges at the enlargements.
In a further preferred embodiment, the counter ring is made of ceramic or sinter materials and the rubbing or front surface of the sliding ring at least partly overlaps the recess in at least one circumferential location. It is hereby an advantage that the remaining partial opening between the rubbing surface of the sliding ring and the recess is sufficiently large for most applications to keep the crystalline deposits away from the region of the rubbing surfaces while - compact dimensions of the shaft seal in radial direction are achieved.
The area of contact between the slidlng ring and the counter ring is there~y sufficiently large to pre~ent canting during the intended use.
.
The present invention will now be further described in the followlng by way of a preferred embodiment and with reference to the attached drawlngs, which in some cases show the components of interest in schematic illustration.
Figure 1 is a cross section through a shaft seal in accordance with the invention; and Figures 2 to 10 respectively illustrate preferred embodiments of counter rings for use in a shaft seal as shown in Figure 1.
Figure 1 illustrates a shaft seal 15 for a shaft 2 ~hich is rotatable in relation to a housing 12 around an axis 1. The shaft seal 15 includes a counter ring 3 which has an annular, axial end surface 4 2~9~6~
that extends perpendicular to the æis 1. A sliding ring 5 is forced by a helical spring 13 against the counter ring 3J so ~hat a front surface 14 of the sliding ring 5 contacts the end surface 4 of the counter ring 3. The counter ring 3 is fixed to the axis 1 and rotatable therewith and the sliding ring 5 is mounted in the housing 12. Thus, durin~ the ; intended use, the sliding ring 5 and the counter ring 3 rota~e relative to each other and rest against each other along their mutually contacting front and end surfaces 14 and 4 which rub againsS each other. The end ~ surface 4 of the counter ring 3 has an axial recess 6, which in radial - 10 direction is located in at least one portion of the end surface 4 that does not extend farther than the annular median of the sliding ring 5.
Silicone oxide crystals depo~ited at elevated temperatures on the radially inward surface of the sliding ring 5 are thereby kPpt away from ~: the region of the mutually contacting rubbing surfaces of the sliding and counter rings 5 and 3 and are reliably prevented from entering into that region. This construction provides for excellent operating characteristics and an extended service period. Deposits accumulate in ; the recess 6 of the counter ring 3 and along the radially inner surface 11 of the sliding ring 5.
; 20 Counter rings which have differently shaped axial recesses 6 areillustrated in the following Figures 2 to 10. The sliding ring 5 which during the intended use contacts the respectlve counter ring is indicated in broken lines. The counter ring 3 shown in Figure 2 is provided with a recess 6 in form of contlnuous groove 9 which surrounds the axis 1 at a constant radial distance. The groove may have a rectangular or semi-circular cross section.
Figure 3 shows a counter ring 3 which essentially corresponds to the counter ring of Figure 2 whereby the recess is a cut-out provided radially inwardly of the rubbing or front surface of the sliding ring 5.
A counter ring 3 of such construction is especially easily and ; economically nanufactured.
In Figures 4 and 5, the recesses 6 surround the axis 1 at a constantly changing radial distance. In a circumferential segment of the counter rlng end surface 4, the recesses 6 contact the front surface of the sliding ring 5 and at least par~ly overlap therewith. Contaminants present in the region of the mutually contacting rubbing surfaces .
.
.. ~ . : . . .:
2~3~80 are reliably removed with this construction whereby a long service perlod is guaranteed.
The recesses 6 of the counter rings respectively illustrated in Figures 6 and 7 have radially outwardly protruding enlargements 10 which are positioned at three circumferentially evenly distrlbuted locations.
~ As mentioned in relation to Figures 2 and 3, the recesses 6 may have a ; rectangular or semi circular cross section. The recesses 6 are positioned radially inwardly of the rubbing or front surface of ~he sliding ring S, whereby the rubbing surface of the sllding ring 5 is only in contact with the radially outwardly protruding enlargements of the ;, respective recess.
In Figure 8, the recess is eccentrically positioned in relation to the rubbing surface of the sliding ring 5 in such a way that it is cut in one circumferential location by the radially inner wall of the counter ring which is directed towards the axis 1.
Figure 9 shows a counter ring 3 which along its inner circumference ` has three radially outwardly protruding enlargements 10 of conical shape, , ,.!
wherein contaminants can be received and kept away Erom the rubbing surfares of the sliding ring 5 and the counter ring 3. The inner diameters of the sliding ring 5 and the counter ring 3 are identical in this embodiment.
Figure 10 shows a counter ring 3 which has radially outwardly protruding enlargements 10 in form of a groove that respectively extends over the whole axial length of the counter ring 3. This embodiment is advantageous over the embodimen~ of Figure 9, since at the enlargements 10 the rubbing surfaces of the sliding ring 5 and the counter ring 3 contact at right angles and not at an angle of 45 as illustrated in Figure 9. With this construction according to Figure 10, the rubbing surfaces of the sliding ring 5 and the counter ring 3 are better protected from contamination.
~'
Claims (20)
1. A shaft seal for a shaft rotatable in a housing about an axis of rotation, comprising a counter ring having an axial end surface of annular shape which extends perpendicular to the axis of rotation, and a sliding ring which is resiliently forced against the counter ring end surface, the counter ring end surface having an axial recess in that portion of the counter ring end surface which is closer to the axis of rotation.
2. A shaft seal according to claim 1, wherein the portion of the counter ring extends from the radially inner surface of the counter ring to the annular median of the sliding ring.
3. A shaft ring seal according to claim 1 or 2, wherein the recess on the side remote from the axis of rotation is defined by a conical surface which surrounds the axis of rotation and the diameter of which increases in direction of the sliding ring.
4. A shaft seal according to claim 3, wherein the conical surface encloses an angle of 8.75 to 45° with the axis of rotation.
5. A shaft seal according to claim 1 or 2, wherein the recess is a continuous groove which surrounds the axis of rotation.
6. A shaft seal according to claim 1, 2 or 4, wherein the recess surrounds the axis of rotation at a constant radial distance.
7. A shaft ring seal according to claim 1, 2 or 4, wherein the recess surrounds the axis at a continuously changing radial distance.
8. A shaft seal according to claim 6, wherein the recess is continuous in circumferential direction.
9. A shaft seal according to claim 7, wherein the recess is continuous in circumferential direction.
10. A shaft seal according to claim 7, wherein the recess at least at one circumferential location is cut by the radially inner surface of the counter ring directed towards the axis of rotation.
11. A shaft seal according to claim 8, wherein the recess at least at one circumferential location is cut by the radially inner surface of the counter ring directed towards the axis of rotation.
12. A shaft seal according to claim 5, wherein the recess on the side remote from the axis of rotation is defined by a surface which extends parallel to the axis of rotation.
13. A shaft seal according to claim 6, wherein the recess on the side remote from the axis of rotation is defined by a surface which extends parallel to the axis of rotation.
14. A shaft seal according to claim 7, wherein the recess on the side remote from the axis of rotation is defined by a surface which extends parallel to the axis of rotation.
15. A shaft seal according to claim 8, wherein the recess on the side remote from the axis of rotation is defined by a surface which extends parallel to the axis of rotation.
16. A shaft seal according to claim 9, wherein the recess on the side remote from the axis of rotation is defined by a surface which extends parallel to the axis of rotation.
17. A shaft seal according to claim 1, 2, 4, 8, 9, 10, 11, 12, 13, 14, 15 or 16, wherein the recess at least at one circumferential location is provided with a radially outwardly protruding enlargement of its profile.
18. A shaft seal according to claim 17, wherein the enlargement in direction parallel to the axis of rotation has an essentially semi-circular profile.
19. A shaft seal according to claim 1, 2, 4, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17 or 18, wherein the counter ring is made of ceramic material.
20. A shaft seal according to claim 1, 2, 4, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18 or 19, wherein the recess at least at one circumferential location of the counter ring end surface is at least partly overlapped by the front surface of the sliding ring.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP4211879.4 | 1992-04-09 | ||
| DE19924211879 DE4211879A1 (en) | 1992-04-09 | 1992-04-09 | Mechanical seal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2093680A1 true CA2093680A1 (en) | 1993-10-10 |
Family
ID=6456425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2093680 Abandoned CA2093680A1 (en) | 1992-04-09 | 1993-04-08 | Shaft seal |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0564698A1 (en) |
| JP (1) | JPH0611047A (en) |
| BR (1) | BR9300740A (en) |
| CA (1) | CA2093680A1 (en) |
| DE (1) | DE4211879A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3317347B2 (en) * | 1999-09-02 | 2002-08-26 | 日本電気株式会社 | Semiconductor device having diode and method of manufacturing the same |
| DE102006011620B3 (en) * | 2006-03-14 | 2007-09-06 | Federal-Mogul Burscheid Gmbh | Mechanical seal |
| DE102006026550A1 (en) * | 2006-06-08 | 2007-12-13 | Audi Ag | Ceramic materials containing carbon particles of spherical shape |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1814705A (en) * | 1928-12-03 | 1931-07-14 | Bryan P Joyce | Packing |
| GB735250A (en) * | 1953-03-03 | 1955-08-17 | Henschel & Sohn Ges Mit Beschr | Rotary shaft seals |
| DE1775596A1 (en) * | 1968-08-30 | 1972-03-16 | Kupfer Asbest Co | Sliding rings for axially acting shaft seals |
| GB1237943A (en) * | 1968-10-28 | 1971-07-07 | ||
| US3638957A (en) * | 1970-03-19 | 1972-02-01 | Borg Warner | Mechanical seal with lubricating means |
| JPS4818918U (en) * | 1971-07-14 | 1973-03-03 |
-
1992
- 1992-04-09 DE DE19924211879 patent/DE4211879A1/en not_active Withdrawn
- 1992-10-16 EP EP92117698A patent/EP0564698A1/en not_active Withdrawn
-
1993
- 1993-03-04 BR BR9300740A patent/BR9300740A/en unknown
- 1993-04-08 CA CA 2093680 patent/CA2093680A1/en not_active Abandoned
- 1993-04-09 JP JP8334893A patent/JPH0611047A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE4211879A1 (en) | 1993-10-14 |
| EP0564698A1 (en) | 1993-10-13 |
| JPH0611047A (en) | 1994-01-21 |
| BR9300740A (en) | 1993-10-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5172918A (en) | Secondary seal for gas turbines | |
| US5261528A (en) | Roller for belt conveyor | |
| KR880000594B1 (en) | Seal rings for bearings | |
| US5186472A (en) | Unitized radial shaft seal | |
| US3135518A (en) | Unitized radial shaft seals | |
| US4094512A (en) | Shaft seals | |
| US20060006602A1 (en) | Rotary seal | |
| CA1221130A (en) | Seals for bearings | |
| EP0156552A1 (en) | Interlocking universal joint seal assembly | |
| JPH0235177B2 (en) | ||
| US10837558B2 (en) | Seal | |
| US4763904A (en) | Sealing apparatus | |
| US4183542A (en) | Rotating face sealing gasket, particularly for use on tracked vehicles | |
| US20100183759A1 (en) | Roller for Pelleting Mill | |
| CA2093680A1 (en) | Shaft seal | |
| JP2009041708A (en) | Sealing device | |
| GB2076480A (en) | Shaft | |
| US5655781A (en) | Unitized radial and facial seal | |
| EP0933545B1 (en) | Bearing assembly with housing cap and seal | |
| CA2074446C (en) | Cassette seal | |
| US2367403A (en) | Fluid seal | |
| CN209943506U (en) | Industrial robot sealing joint | |
| US5713579A (en) | Dynamic seal | |
| HU192268B (en) | Antifriction bearing provided with packing | |
| US5011301A (en) | Auxiliary sealing system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |