• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Sealing system, comprising a sealing ring (1) with at least one sealing lip (2) and a protective assembly sleeve (3) with integrated sealing cover (4), wherein the sealing lip (2) encloses the protective assembly sleeve (3) on the outer circumference side, without contact and with radial spacing.
    公开号:DK201870308A1
    申请号:DKP201870308
    申请日:2018-05-18
    公开日:2019-01-18
    发明作者:Heldmann Martin；Colineau François；Hintenlang Günter
    申请人:Carl Freudenberg Kg；
    IPC主号:
    专利说明:

    Sealing system and Protective Assembly Sleeve with Integrated Sealing Cover
    Description
    Technical Field
    The invention concerns a sealing system, comprising a sealing ring with at least one sealing lip and a protective assembly sleeve with integrated sealing cover.
    Prior art
    A sealing system and a protective assembly sleeve with integrated sealing cover of this kind are known from DE 103 25 254 A 1.
    The sealing ring is designed as a radial shaft seal with a dynamically-stressed sealing lip. The protective assembly sleeve has a protective surface, extending in the axial direction, for the sealing lip, wherein the protective surface is enclosed, under radial pre-stress, by the sealing lip.
    The sealing cover is provided with a holding device designed like a handle that is non-destructively detachable from the sealing cover. The holding device is bound to the protective assembly sleeve with a joint and is pivoted around the joint.
    On the one hand, the protective assembly sleeves serve for bearing and transport of sealing rings. On the other hand, protective assembly sleeves are used for the assembly of sealing rings on a shaft, to prevent the sealing lip of the sealing ring from being damaged thereby. During the assembly of the sealing ring on a shaft, the protective assembly sleeve protects the sealing lip ofthe sealing ring from damage through sharp-edged transitions or sharp-edged profiles of the shaft, e.g., when the shaft has multi-tooth or spline profiles. After the assembly, the protective assembly sleeve is separated from the sealing ring, and then the sealing lip encloses the sealed surface of the sealed shaft under radial pre-stress.
    If the sealing system and a machine element housing, in which the sealing ring is to be used, form a pre-assembled unity, then the sealing cover ensures that the opening ofthe protective assembly sleeve, and thereby the housing, are sealed.
    Contaminations from the environment are thereby hindered from intruding into the
    DK 2018 70308 A1 housing. For example, lubricants, with which the housing is already filled, are thereby also prevented from entering and contaminating the environment from the interior of the housing during the transport of the housing.
    However, it should be noted that the fabrication of the previously mentioned sealing system requires great diligence, and, thereby, generally speaking, the danger exists that the sealing lip of the sealing ring will be damaged by the assembly of the protective assembly sleeve. This is mainly attributable to the fact that the sealing lip has an overlap with respect to the protective surface of the protective assembly sleeve, and a sharp-edged (e.g., not diligently deburred) protective assembly sleeve can thus damage the sealing lip. Apart from that, it should be noted that the assembly power required for the completion of the sealing system is so great that the sealing system is not mountable by hand. That, too, is because the sealing lip of the sealing ring in the previouslymentioned sealing system securely encloses the protective assembly sleeve under radial pre-stress. For the assembly of the protective assembly sleeve in the sealing ring, an assembly tool - especially, a pressing tool - is necessary.
    This makes the fabrication of the sealing system laborious and expensive.
    Disclosure of the invention
    The invention has the aim of further developing a sealing system and a protective assembly sleeve with integrated sealing cover of the kind previously described that results in a simplified manufacturing process - especially, in that the sealing lip of the sealing ring is even more securely protected from deformation and/or damage by the assembly of the protective assembly sleeve in the sealing ring, and also that the joining force for the fabrication of the sealing system is reduced - especially, for the assembly of the protective assembly sleeve in the sealing ring.
    In accordance with the invention, this aim is achieved by the features of claims 1 and 23. The sub-claims refer to advantageous embodiments of the present invention.
    In order to achieve this aim, the sealing lip encloses the protective assembly sleeve on the outer circumference side, without contact and with radial spacing.
    DK 2018 70308 A1
    The advantage here is that the sealing lip never touches the protective assembly sleeve at any point during the fabrication of the sealing system. Burrs and/or increased roughness of the protective assembly sleeve have no detrimental influence on the sealing lip. There is also the advantage, through the contact-free assignment of the sealing lip to the protective assembly sleeve, that the joining force for the assembly of the protective assembly sleeve in the sealing ring for the fabrication of the sealing system is reduced. A relative movement with friction between the protective assembly sleeve and the sealing lip, which would increase the joining force, does not take place. Thereby arises the possibility that the sealing system is mountable by hand (without tools).
    A sealed machine element that is sealed by the sealing ring from the sealing system can be formed through a shaft shoulder, wherein the sealing diameter of the sealing shaft shoulder corresponds approximately to the sealing diameter of the sealing lip of the sealing ring in such a way that the sealing lip encloses and seals the sealing surface with less overlap under radial pre-stress.
    In the assembly direction of the sealing shaft shoulder, a further shaft shoulder can be arranged with a comparably small sealing diameter that has a multi-tooth or spline profile. This, mostly sharp-edged, profile is inserted through the protective assembly sleeve (e.g., into a sealed housing). Subsequently, the protective assembly sleeve is removed, and the shaft further inserted in the assembly direction up until the sealed shaft shoulder is tightly sealed by the sealing lip of the sealing ring.
    In contrast to the other shaft shoulder that is designed as a multi-tooth or spline profile, the sealing surface of the sealing shaft shoulder has a usual surface finish that has no undesired detrimental influence on the performance characteristics and/or service life of the sealing lip.
    The sealing lip can consist of an elastomeric material. Sealing lips from elastomeric material are especially sensitive to touch with sharp-edged and/or rough objects. The contact of a sealing lip from elastomeric material with a sharp-edged protective assembly sleeve can lead to the sealing lip being damaged and its function thereby no longer being fulfilled. Such damage is often not readily apparent, such that the damage to the sealing lip first becomes apparent during its intended use through a leakage, and the damaged sealing ring must be replaced at great cost and
    DK 2018 70308 A1 expenditure of time. It is therefore especially important that particularly sensitive sealing lips of the protective assembly sleeve be formed without contact and with radial spacing.
    The sealing lip, which is formed without contact and with radial spacing on the outer circumference side of the protective assembly sleeve, can be formed as a dynamicallystressed sealing lip. It is especially important for dynamically-stressed sealing lips that, before their intended use, they not be elastically deformed or damaged at all - for example, in such a way that the sealing ring is bound to the protective assembly sleeve and completed for the sealing system. Even slight damage to a dynamically-stressed sealing lip can easily lead to a total failure of the sealing ring during its intended use particularly, for example, when they have a delicate geometry for the enhancement of the performance characteristics - as with a return feed.
    The sealing lip can at least be assigned an adjacent dirt sealing lip with axial spacing. Such dirt sealing lips serve, for example, the function of keeping environmental contaminations away from the sealing lip.
    According to an initial design, it can be stipulated that the dirt sealing lip consist of elastomeric material, and the protective assembly sleeve be enclosed on the outer circumference side, without contact and with radial spacing. Such a design is therefore advantageous when the sealing lips and at least one dirt sealing lip merge into one piece and are formed with uniform materials. The dirt sealing lip is usually just as sensitive as the sealing lip, and must likewise be protected from an elastic deformation or any damage by means of the protective assembly sleeve during the fabrication of the sealing system.
    According to a different design, it can be stipulated that the dirt sealing lip consist of elastomeric material, and the protective assembly sleeve be enclosed on the outer circumference side, without contact and with radial spacing. Such a dirt sealing lip can, for example, consist of PTFE. Dirt sealing lips are - especially, if they consist of a polymer material - often less sensitive than sealing lips made from elastomeric material. Such a dirt sealing lip can thereby securely enclose the protective assembly sleeve on the outer circumference side under elastic pre-stress, without problems. Abutting contact
    DK 2018 70308 A1 of the dirt sealing lips with the protective assembly sleeve has the further advantage that the protective assembly sleeve is pre-centred, in relation to the sealing lip, during assembly in the sealing ring by the dirt sealing lip, and, to a great extent, concentrically inserted into the sealing ring. As a result, there is no risk of touching and/or damaging the sealing lip during the assembly of the protective assembly sleeve in the sealing ring.
    The sealing ring may be formed as a radial shaft seal. Radial shaft seals are successfully used in various sizes for various inserting applications, e.g., for the sealing of gear-housing in motor vehicles.
    The sealing ring and the protective assembly sleeve can be connected in a positive fit to each other through a non-destructive, detachable, latchable connection. It is advantageous if the sealing system is developed altogether as a pre-assembled unit. The sealing ring and the protective assembly sleeve are then securely connected to each other and can be mounted together in a sealed machine element.
    The latchable connection can be formed by an undercut in the sealing ring or in the protective assembly sleeve, in which a projection ofthe protective assembly sleeve or the sealing ring is latchable. For the assembly of the sealing system, the protective assembly sleeve is (e.g., by hand) inserted axially into the sealing ring without touching the sealing lip. In the end position of the protective assembly sleeve, the latchable connection is closed with respect to the sealing ring, and the sealing ring and the protective assembly sleeve are securely set together.
    To detach the latchable connection, when a sealed shaft, with its surface critical for the sealing lip, is passed on the sealing lip in the axial direction, the protective assembly sleeve is (e.g., by hand) pulled out under the sealing lip ofthe sealing ring. Subsequently, the sealing shaft is brought into its end position, and the sealing lip and, if necessary, the dirt sealing lip enclose the sealing surface ofthe shaft under radial elastic pre-stress.
    The undercut and the projection are detachable from one another by an initial pull. The initial pull is thereby measured in such a way that the latchable connection can
    DK 2018 70308 A1 be detached by hand by the sealing system technician without any problem, and that an unintended detachment of the latchable connection is nevertheless avoided.
    The sealing ring can have an initial lead-in chamfer for the protective assembly sleeve on the axial side facing away from the sealing lip. The assembly of the protective assembly sleeve in the sealing ring is thereby simplified. The initial lead-in chamfer ensures centring of the protective assembly sleeve obtained from the sensitive sealing lip of the sealing ring.
    The undercut can be arranged in the initial lead-in chamfer. Here, the advantage is that the insertion force of the protective assembly sleeve in the sealing ring is minimal, up until the last moment before the locking in of the latchable connection. Only in the last moment before the projection is latched into the undercut and the latchable connection is closed is the necessary insertion force for latching greater.
    The protective assembly sleeve may have a second lead-in chamfer narrowing in a funnel shape axially in the direction of the sealing lip, wherein both lead-in chamfers are arranged concentrically to and extended essentially in parallel with one another. The second lead-in chamfer forms a centring aide for a sealing shaft, which, in the assembly direction, is first led through the second lead-in chamfer and then under the sealing lip of the sealing ring.
    Preferably, it can be provided that the projection be arranged on the second lead-in chamfer. The sealing system has thereby, altogether, compact dimensions especially, in the axial direction.
    The protective assembly sleeve can consist of a polymer material. Such protective assembly sleeves are simple and cost-effective to manufacture, as well as resistant to moisture and the usual, sealed media. The protective assembly sleeve need not be particularly tolerant and/or have a high surface finish, because the sealing lip encloses the protective assembly sleeve on the outer circumference side, without contact and with radial spacing.
    The protective assembly sleeve can have an initial break-off clip for removing the protective assembly sleeve from the sealing ring after successful assembly of the
    DK 2018 70308 A1 sealing system in a sealed machine element. Such a break-off clip is preferably merged in one piece with the protective assembly sleeve and formed of uniform material. The break-off clip can be single-stream recycled together with the protective assembly sleeve, if necessary.
    According to an advantageous embodiment of the present invention, the protective assembly sleeve and the sealing cover are designed so that they merge into one another and are formed of uniform material. Protective assembly sleeve and sealing cover can be manufactured together in only one procedural step. Thereby, the sealing system is, altogether, simple and inexpensive to manufacture.
    The protective assembly sleeve can have a centrally-arranged through hole that is closed by the sealing cover due to manufacturing conditions. The sealing cover can be detachable from the through hole side wall of the protective assembly sleeve. For that, the sealing cover can have a second break-off clip, wherein the sealing cover is detachable from the protective assembly sleeve by a second pull. The opening of the central through hole of the protective assembly sleeve for the assemblage of a sealing shaft is thereby especially simple, and self-explanatory for the user of a sealing system.
    The first pull is greater than the second pull. That is advantageous for preventing the latchable connection between the sealing ring and the protective assembly sleeve from being unintentionally released early, before the sealing cover of the protective assembly sleeve is torn off.
    Brief Description of the Drawings
    Two design examples ofthe inventive sealing system and protective assembly sleeve with integrated sealing cover are explained in more detail in the following figures 1 through 3.
    DK 2018 70308 A1
    Shown are, each in schematic representation:
    Figure 1 an initial exemplary embodiment of a sealing system, in which the sealing lips and dirt sealing lips of the sealing ring consist of an elastomeric material, and the protective assembly sleeve in each case is enclosed on the outer circumference side, without contact and with radial spacing,
    Figure 2 a second exemplary embodiment of a sealing system, similar to the exemplary embodiment from Figure 1, wherein, however, only the sealing lip encloses the protective assembly sleeve on the outer circumference side, without contact and with radial spacing, and
    Figure 3 a view of the sealing systems from Figures 1 and 2.
    Detailed Description of the Invention
    Figures 1 and 2 each schematically show an exemplary embodiment of an inventive sealing system.
    Each sealing system comprises the sealing ring 1, which is formed as a radial shaft seal. The sealing ring 1 has a dynamically-stressed sealing lip 2, which consists of an elastomeric material and which encloses the protective assembly sleeve 3 on the outer circumference side, without contact and with radial spacing.
    In the design examples shown here, the sealing ring 1 and the protective assembly sleeve 3 are detachably and non-destructively connected in a positive fit through a latchable connection 7. The latchable connection 7 is formed by an undercut 8 in the initial lead-in chamfer 11 of the sealing ring 1, wherein, in the undercut 8 of the projection 9, the protective assembly sleeve 3 is latchable. The projection 9 is arranged on the side, radially facing undercut 8, of the second lead-in chamfer 12 of the protective assembly sleeve 3.
    The protective assembly sleeve 3 is, in both sealing systems according to Figures 1 and 2, removed from the sealing ring 1 by the first break-off clip 13, when a sealing
    DK 2018 70308 A1 shaft (not shown here), with its surface critical for the sealing lip 2, is introduced past the sealing lip 2 in a housing (also not shown here).
    In order to release the centrally-arranged through hole 14 of the protective assembly sleeve 3 for the assembly of a sealed shaft, the sealing cover 4 is separated, by the second break-off clip 15, from the wall, adjoining the through hole 14, of the protective assembly sleeve 3.
    The first pull 10, which is used for the release of the latchable connection 7, in order to non-destructively separate undercut 8 and projection 9 from one another, must be greater than the second pull 16, by which the sealing cover 4 is detachable from the protective assembly sleeve 3. It is prevented thereby that the latchable connection 7 is detached unintentionally before the sealing cover 4 is torn off of the protective assembly sleeve 3.
    In figure 1, an initial exemplary embodiment is shown.
    The sealing lip 2 of the sealing ring 1 encloses the protective assembly sleeve 3 on the outer circumference side, without contact and with radial spacing, like the two dirt sealing lips 5 to which the sealing ring 2 on the side facing the environment 17 with axial spacing is adjacently assigned.
    In this design example, sealing lip 2 and the dirt sealing lips consist of a coordinated elastomeric material. The first lead-in chamfer 11, also, is designed with materials coordinated with the sealing lip 2 and the dirt sealing lips 5.
    Through the radial spacing and the contactless assignment of the protective assembly sleeve 3, deformations of sealing lip 2 and dirt sealing lips 5 are securely precluded by the protective assembly sleeve 3, as is, by the assembly of the protective assembly sleeve 3, damage to sealing lip 2 and dirt sealing lips 5.
    In figure 2, a second design example of the inventive sealing system is shown, similar to the design example from Figure 1. The way in which the sealing system from Figure 2 is differentiable from the sealing system from Figure 1 is that only one dirt sealing lip 5 is provided and this dirt sealing lip 5 consists of a polymer material, and
    DK 2018 70308 A1 the protective assembly sleeve 3 on the outer circumference side is securely enclosed under elastic pre-stress.
    When the protective assembly sleeve 3 is inserted in assembly direction 18 into the sealing ring 1 for the manufacturing ofthe sealing system, the first, circularly-designed dirt sealing lip 5 becomes deformed in the area of its axial inner circumference in the direction of sealing lip 2 and causes thereby a pre-centring of the protective assembly sleeve 3 with respect to sealing lip 2. The protective assembly sleeve 3 can be inserted with particular ease into the sealing ring 1, without touching the sealing lip 2 of the sealing ring 1.
    The sealing system according to the invention has a simple construction and can be manufactured in a simple and cost-effective manner.
    The sensitive sealing lip of the sealing ring and, if necessary, the sensitive dirt sealing lips are first adjacently touched by a sealed surface of a sealed machine element and elastically deformed. During the manufacturing and subsequent placement of the sealing system, the sealing lip 2, at least, of the protective assembly sleeve 3 is not touched and can therefore not be deformed and/or damaged. By means of the contactless assignment, the joining force in the manufacturing of the sealing system is low enough that the sealing lip and the protective assembly sleeve can be joined by hand.
    权利要求:
    Claims (23)
    [1] Claims
    1. Sealing system, comprising a sealing ring (1) with at least one sealing lip (2) and a protective assembly sleeve (3) with integrated sealing cover (4), characterised in that the sealing lip (2) encloses the protective assembly sleeve (3) on the outer circumference side, without contact and with radial spacing.
    [2] 2. Sealing system according to claim 1, characterised in that the sealing lip (2) consists of an elastomeric material.
    [3] 3. Sealing system according to one of claims 1 or 2, characterised in that the sealing lip (2), during intended use of the sealing ring (1), is dynamically stressed.
    [4] 4. Sealing system according to one of claims 1 through 3, characterised in that the sealing lip (2) is adjacently assigned to at least one dirt sealing lip (5) with axial spacing.
    [5] 5. Sealing system according to claim 4, characterised in that the dirt sealing lip (5) consists of an elastomeric material, and the protective assembly sleeve (3) is enclosed on the outer circumference side, without contact and with radial spacing.
    [6] 6. Sealing system according to claim 4, characterised in that the dirt sealing lip (5) consists of an elastomeric material, and the protective assembly sleeve (3) is securely enclosed on the outer circumference side under elastic pre-stress.
    [7] 7. Sealing system according to one of claims 1 through 6, characterised in that the sealing ring (1) is designed as a radial shaft seal (6).
    [8] 8. Sealing system according to one of claims 1 through 7, characterised in that the sealing ring (1) and the protective assembly sleeve (3) are connected in a positive fit to each other through a non-destructive, latchable connection (7) that is detachable.
    DK 2018 70308 A1
    [9] 9. Sealing system according to claim 8, characterised in that the latchable connection (7) is formed through an undercut (8) in the sealing ring (1) or in the protective assembly sleeve (3), in which a projection (9) ofthe protective assembly sleeve (3) or ofthe sealing ring (1) is latchable.
    [10] 10. Sealing system according to claim 9, characterised in that the undercut (8) and the projection (9) are detachable from one another through an initial pull (10).
    [11] 11. Sealing system according to one of claims 1 through 10, characterised in that the sealing ring (1) on the axial side facing away from the sealing lip (2) has an initial lead-in chamfer(11) for the protective assembly sleeve (3).
    [12] 12. Sealing system according to one of claims 9 through 11, characterised in that the undercut (8) is arranged in the initial lead-in chamfer (11).
    [13] 13. Sealing system according to one of claims 1 through 12, characterised in that the protective assembly sleeve (3) has a second lead-in chamfer (12) narrowing in a funnel shape axially in the direction of the sealing lip (2), and that both lead-in chamfers (11, 12) are arranged concentrically to and extended essentially in parallel with one another.
    [14] 14. Sealing system according to one of claims 9 through 13, characterised in that the projection (9) is arranged in the second lead-in chamfer (12).
    [15] 15. Sealing system according to one of claims 1 through 14, characterised in that the protective assembly sleeve (3) consists of a polymer material.
    [16] 16. Sealing system according to one of claims 1 through 15, characterised in that the protective assembly sleeve (3) has an initial break-off clip (13) for removal ofthe protective assembly sleeve (3) from the sealing ring (1) after successful assembly ofthe sealing system.
    DK 2018 70308 A1
    [17] 17. Sealing system according to one of claims 1 through 16, characterised in that the protective assembly sleeve (3) and the sealing cover (4) are configured so as to merge integrally into one another and formed of a uniform material.
    [18] 18. Sealing system according to one of claims 1 through 17, characterised in that the protective assembly sleeve (3) has a centrally-arranged through hole (14) that is closed by the sealing cover (4) due to manufacturing conditions.
    [19] 19. Sealing system according to one of claims 1 through 18, characterised in that the sealing cover (4) is detachable from the wall, forming the boundary of the through hole (14), of the protective assembly sleeve (3).
    [20] 20. Sealing system according to one of claims 1 through 19, characterised in that the sealing cover (4) has a second break-off clip (15).
    [21] 21. Sealing system according to one of claims 1 through 20, characterised in that the sealing cover (4) is detachable from the protective assembly sleeve (3) by a second pull (16).
    [22] 22. Sealing system according to one of claims 10 through 21, characterised in that the first pull (10) is greater than the second pull (16).
    [23] 23. Protective assembly sleeve (3) with integrated sealing cover (4), characterised in that it is designed according to one of claims 1 through 22.
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    同族专利:
    公开号 | 公开日
    DE102017004871B3|2018-11-22|
    DK179957B1|2019-10-30|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EP1240980B1|2001-03-16|2008-10-22|Ford Global Technologies, LLC|Transport safety and mounting ring for shaft seals|
    DE20321639U1|2003-06-03|2008-09-18|Carl Freudenberg Kg|Mounting protection ring|
    FR2860206B1|2003-09-30|2005-11-18|Renault Sa|PROTECTIVE DEVICE FOR SEAL JOINT AND METHOD FOR MOUNTING A GEARBOX SHAFT.|
    EP2256382B1|2009-05-05|2012-05-02|Carl Freudenberg KG|Seal arrangement|DE102020111366B3|2020-04-27|2021-03-25|Carl Freudenberg Kg|Sealing ring and sealing arrangement comprising such a sealing ring|
    法律状态:
    2019-01-18| PAT| Application published|Effective date: 20181123 |
    2019-10-30| PME| Patent granted|Effective date: 20191030 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102017004871.1A|DE102017004871B3|2017-05-22|2017-05-22|Sealing arrangement and mounting sleeve with integrated cover|
    DE102017004871.1|2017-05-22|
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