WO2007016980A1 - Joint d'arbre en elastomere - Google Patents

Joint d'arbre en elastomere Download PDF

Info

Publication number
WO2007016980A1
WO2007016980A1 PCT/EP2006/003651 EP2006003651W WO2007016980A1 WO 2007016980 A1 WO2007016980 A1 WO 2007016980A1 EP 2006003651 W EP2006003651 W EP 2006003651W WO 2007016980 A1 WO2007016980 A1 WO 2007016980A1
Authority
WO
WIPO (PCT)
Prior art keywords
sealing
component
sealed
radial shaft
sealing ring
Prior art date
Application number
PCT/EP2006/003651
Other languages
German (de)
English (en)
Inventor
Constantin Esser
Nadine Veit
Original Assignee
Federal-Mogul Sealing Systems Bretten Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Federal-Mogul Sealing Systems Bretten Gmbh filed Critical Federal-Mogul Sealing Systems Bretten Gmbh
Publication of WO2007016980A1 publication Critical patent/WO2007016980A1/fr

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
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3244—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with hydrodynamic pumping action

Definitions

  • the present invention relates to a radial shaft seal for sealing rotating shafts or generally movable components in a machine. It relates in particular to such a sealing ring with an elastomer sealing lip and without a radial spring, by which the friction with the shaft to be sealed is minimized. Likewise, it relates to a corresponding sealing ring, which ensures a sufficient sealing function regardless of the direction of rotation of a shaft to be sealed.
  • Radial shaft seals serve to seal rotating shafts. This means that usually an oil space or generally lubricant space is sealed against loss of lubricant. In this case, the lying inside the seal part of the shaft is well lubricated, while the outer part should remain free of lubricant, and, conversely, the penetration of foreign bodies, liquids, etc. is to be prevented in the lubricant space.
  • Such rings usually have an elastomer sealing lip which rests circumferentially on the shaft.
  • this sealing area In order to achieve a seal, this sealing area must always be in good contact with the shaft surface in order to prevent the escape of lubricant and the ingress of dirt or the like. to prevent. Therefore, a radial spring is usually used, which spring-loaded the sealing area and thus ensures the contact.
  • RWDRs are not only used for rotating waves, but also in addition
  • RWDRs are also used in suspension forks of two-wheelers such as mountain bikes or motorcycles, in which case the components to be sealed, ie the dip tubes, usually move only axially through the seal.
  • an RWDR should also provide a return action, i. be designed so that to be sealed lubricant is moved only in the direction of the lubricant space and not vice versa so that it exits and is therefore lost.
  • a Ruforder Lucky is achieved by the sealing ring is provided with a helical configuration of the sealing area.
  • the return action depends on the direction of rotation of the shaft, i.
  • the sealing ring can only be used for shafts that rotate in the corresponding direction of rotation.
  • the sealing ring is intended to provide the remindf ⁇ rderfahtechnik regardless of the direction of rotation of a rotating shaft.
  • a radial shaft seal for sealing a movable member.
  • the sealing ring comprises a first sealing disc of elastomeric material having an inner recess for receiving the component to be sealed.
  • the sealing disc has a sealing region, which is adapted so that it runs parallel to the component to be sealed when the sealed component to be sealed.
  • the sealing area points to the component facing side at least two grooves separated by grooves sealing lips, which extend closed around the recess, and which are adapted to abut sealingly against a recorded component to be sealed.
  • the thickness of the sealing region varies in the direction of the recess.
  • the sealing ring according to the present invention has no additional radial spring. This simplifies the manufacture of such a sealing ring and makes it more cost effective. Due to the lack of radial spring, the friction of the sealing ring can be further reduced, which reduces power loss and wear, wherein the required minimum pressure of the sealing area is ensured by the same thickening design.
  • the radial shaft sealing ring further comprises a support frame to which the sealing disc is attached. Since the actual sealing part of the sealing ring is made of elastomeric material, a stable carrier is advantageous to which the elastomeric material is attached. The carrier facilitates the handling, especially the installation, and establishes an optimal connection with the machine in which the sealing ring is used.
  • the cross-sectional profile of the sealing lips is designed so that they lie linearly against the component to be sealed.
  • An at least partially planar concern is however also preferred in further embodiments.
  • the cross-sectional profile of the sealing lips is designed so that at least one of the sealing lips is linear and at least one of the sealing lips rests flat against the component to be sealed.
  • Flat concerns can achieve a better sealing effect, in which case the friction can be correspondingly higher.
  • line-shaped sealing lips can develop a kind of lubricant wiping effect.
  • the radial shaft seal further comprises a second Sealing disc made of elastomeric material with an inner recess for the component to be sealed.
  • the second sealing disc forms a pre-seal, which is arched opposite to the extent of the first sealing region when a component to be sealed is received.
  • the pre-seal can form a deflector for dust particles and similar foreign bodies, which should not get into the sealing gap.
  • the two sealing disks are integrally formed.
  • the pre-seal is not applied to the component to be sealed when the component is received. To prevent foreign bodies of a certain minimum size, no direct contact with the pre-seal is required. If a small gap remains, the pre-seal therefore does not generate any additional friction.
  • the pre-seal is tightly against the component to be sealed when the component is received. Although this may cause additional friction, this design may be advantageous to achieve a sealing effect on fluids.
  • a suitable coating of the overlying edge of the pre-seal can minimize friction and wear.
  • the surface of the sealing area is smooth on the side facing away from the sealing lips.
  • the surface of the sealing region on the side facing away from the sealing lips geometric variances (elevations), which are each arranged opposite the sealing lips.
  • Fig. 1 shows a partial cross section of a radial shaft seal according to an embodiment of the present invention, when not installed;
  • Fig. 2 shows a partial cross section of a radial shaft seal according to an embodiment of the present invention, in the installed state
  • FIG. 3 shows a detailed view of the design of the sealing region of the shaft sealing ring according to the invention according to an embodiment of the present invention
  • Fig. 4 shows in an axial plan view of the sealing region of the shaft seal according to the invention.
  • Fig. 5 shows an alternative embodiment of the present invention.
  • the sealing ring according to the invention is shown in a cross-sectional view, in which case only the left part is shown.
  • the sealing ring naturally forms a corresponding ring surrounding the component to be sealed, the component coming to lie on the right side in this view.
  • the sealing ring has a sealing area
  • the sealing region 6 is made of an elastomeric material, whereas the frame 16 is usually made of metal.
  • the invention is not limited to metal here by nature, also conceivable are plastics, ceramics or other suitable materials.
  • the sealing region 6 is here shown in an at least partially relaxed state, i. slightly arched inwards.
  • the space to be sealed such as a space filled with lubricant
  • the "outside" is located at the bottom 12 is primarily designed to keep out dust, dirt and other foreign matter.
  • this part 12 of the sealing ring sealingly bears against the component to be sealed, it can remain a minimum air gap. If the pre-seal 12 is laid adjacent, it can continue to keep liquids, but this is naturally associated with increased friction.
  • Dic-htlippen S are provided (in this case 5), which are separated by grooves 10 from each other.
  • the sealing lips 8 as well as the grooves 10 extend as concentric rings over the entire circumference of the sealing ring. This means that in contrast to conventional sealing rings there is no helically designed thread, but a symmetrical with respect to the sense of rotation interpretation. Screw-shaped threads, which are used for the return conveyance of lubricant, have the disadvantage that they are only suitable for a certain direction of rotation of the component to be sealed.
  • concentric closed annular gaps have advantages in leakage measurements by means of compressed air to verify the correct installation of the sealing ring.
  • Each sealing lip is designed in its geometry so that in the contact area results in a surface pressure that corresponds to the known ratios of spring-loaded RWDR.
  • This means that the contact surfaces of the sealing lips 8 are designed substantially linear, which is indicated by dashed lines, but can be better seen in Fig. 2. In other alternative embodiments but also flat-shaped sealing lips are possible.
  • FIG. 3 A further detail of the sealing ring according to the invention can be seen in more detail in Figure 3, namely that the thickness of the sealing region 6 in the direction of the recess, i. on the top in the drawing, increases.
  • a component 18 can be a rotating shaft (eg axis), an axially moving shaft (dip tube of a fork, etc.), or be a component which performs both a rotational and axial movement during operation of the corresponding machine (such as a valve of a The internal combustion engine).
  • the possible directions of movement of the component 18 are indicated by corresponding arrows.
  • the sealing region 6 is in this representation of the component to be sealed.
  • the preferred Ausf ⁇ ihrungsform in which the sealing lips 8 lie linearly on the component. In other embodiments, but depending on the purpose of a flat concerns possible.
  • the pre-seal 12 is shown here in the variant in which it does not bear directly on the component 18, but leaves a small gap. This makes sense, since there is no more lubricant here, which is to be retained by the sealing lips 8. When applying the pre-seal, it could therefore be damaged quickly without lubrication. However, the pre-seal 12 may also be designed to fit as well, provided that appropriate precautions are taken (sliding coating or the like).
  • the sealing lip portion 6 of the sealing ring is shown in detail.
  • the sealing region 6 thickened towards its end ie the corresponding outer lines include a (small) angle ⁇ > 0.
  • the absence of such a radial spring ensures that the sealing ring according to the invention is simpler and less expensive to produce, and furthermore the friction between the component to be sealed and the sealing area can be reduced. This results in lower power losses in the sealing of the component to be sealed and a longer durability of the sealing ring according to the invention.
  • the sealing region of the sealing ring according to the invention is shown in an axial view.
  • the inner recess 20 for receiving the component to be sealed is shown here as a circular ring, as is required for rotating components.
  • other geometries are conceivable in principle, such as square, hexagonal or octagonal.
  • the sealing lips 8 and the associated grooves 10 extend closed over the entire
  • Recess is less in a state without component than that of the component itself, due to the elastic properties of the sealing ring.
  • FIG. 5 shows an alternative embodiment of the present invention similar to that in FIG. 3.
  • the rear side of the sealing region 6, that is to say the side facing away from the component 18, is not smooth.
  • elevations 22 are provided in this variant, which respectively correspond to the sealing lips or are arranged opposite them.
  • These elevations 22, which are local increases in material thickness, create a kind of "constricting effect.” At these locations, the material is somewhat stiffer due to the greater thickness, and thus a locally increased pressure is achieved by constriction around the component to be sealed the regions of lesser thickness which correspond to the grooves remain flexible, and by this modification of the sealing ring according to the invention a better sealing can be achieved.
  • the invention is based on a radial shaft seal with a flexible, flexurally elastic sealing region made of elastomeric material.
  • the sealing portion is cylindrical over a length on the circumference of the shaft.
  • the standing in contact with the shaft sealing portion is designed in the form of a juxtaposition of concentric individual sealing lips.
  • each sealing lip is designed in its geometry such that a surface pressure results in the contact region, which corresponds to the known ratios of spring-loaded RWDR.
  • the sealing lip region is a juxtaposition of a plurality, at least two, sealing lips, which are interconnected on their back.
  • the material thickness of the rear connection of the individual sealing lips has the function of connecting the sealing lips, and has as a further function to influence the radial force of the individual sealing lips in the desired manner.
  • the thickness of the sealing area increases in the direction of the space to be sealed. This ensures that an increasingly thicker layer of the elastomer material is present in this direction, so that the rigidity and also the contact pressure of the sealing region increase equally.
  • the innermost part of the sealing area ie the part which is most directly in contact with the space to be sealed or the lubricant contained therein, is thereby subjected to the highest pressure.
  • the stiffness of the sealing area decreases again in the direction away from the space to be sealed in order to facilitate the necessary bending of the sealing area.
  • each individual sealing lip results in a return effect of each individual sealing lip, which adds up for all the sealing lips in contact.
  • the sealing area of the seal can be displayed both in the direction of the oil chamber and opposite.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
  • Sealing Devices (AREA)

Abstract

L'invention concerne un joint d'arbre radial destiné à assurer l'étanchéité d'un composant mobile. Ce joint est constitué d'une première rondelle d'étanchéité en matériau élastomère pourvue d'un évidement intérieur (20) destiné à recevoir le composant à rendre étanche (18), cette rondelle d'étanchéité présentant une zone d'étanchéité (6) adaptée de façon à s'étendre de manière sensiblement parallèle au composant à rendre étanche (18), lorsque ce dernier est reçu, et ladite zone d'étanchéité (6) présentant, sur son côté faisant face au composant (18), au moins deux lèvres d'étanchéité (8) séparées par des rainures (10), lesquelles lèvres s'étendent de façon à entourer complètement l'évidement (20) et sont conçues pour s'appuyer de manière étanche contre un composant à rendre étanche (18) reçu dans cet évidement, l'épaisseur de la zone d'étanchéité (6) variant en direction dudit évidement (20).
PCT/EP2006/003651 2005-08-09 2006-04-20 Joint d'arbre en elastomere WO2007016980A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005037568.5 2005-08-09
DE200510037568 DE102005037568A1 (de) 2005-08-09 2005-08-09 Elastomer-Wellendichtring

Publications (1)

Publication Number Publication Date
WO2007016980A1 true WO2007016980A1 (fr) 2007-02-15

Family

ID=36689462

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/003651 WO2007016980A1 (fr) 2005-08-09 2006-04-20 Joint d'arbre en elastomere

Country Status (2)

Country Link
DE (1) DE102005037568A1 (fr)
WO (1) WO2007016980A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014203609A1 (fr) * 2013-06-21 2014-12-24 光洋シーリングテクノ株式会社 Dispositif de joint d'étanchéité hermétique

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5296012B2 (ja) * 2010-06-09 2013-09-25 愛三工業株式会社 排気流路バルブ
DE102016124457A1 (de) * 2016-12-15 2018-06-21 Universität Stuttgart Vorrichtung zur Abdichtung eines Gegenstands

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040056427A1 (en) * 2002-07-31 2004-03-25 Carl Freudenberg Kg Lip seal
US20040124586A1 (en) * 2002-11-07 2004-07-01 Bernard Branchereau Rotary shaft dynamic seal provided with an angular encoder device, a device including such a seal, and a method of fabricating such a seal

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040056427A1 (en) * 2002-07-31 2004-03-25 Carl Freudenberg Kg Lip seal
US20040124586A1 (en) * 2002-11-07 2004-07-01 Bernard Branchereau Rotary shaft dynamic seal provided with an angular encoder device, a device including such a seal, and a method of fabricating such a seal

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014203609A1 (fr) * 2013-06-21 2014-12-24 光洋シーリングテクノ株式会社 Dispositif de joint d'étanchéité hermétique
JP2015004414A (ja) * 2013-06-21 2015-01-08 光洋シーリングテクノ株式会社 密封装置
CN105308371A (zh) * 2013-06-21 2016-02-03 光洋密封技术株式会社 密封装置
US10247308B2 (en) 2013-06-21 2019-04-02 Koyo Sealing Techno Co., Ltd. Hermetic seal device

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Publication number Publication date
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