• 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:
    Abstract The present invention relates to a sealing arrangement for a rotatable shaft of acombustion engine. The rotatable shaft comprises a crankshaft journal (2), a crankshaftgear (3) and a flywheel (4). The sealing arrangement comprises a sealing member (8)configured to be arranged in an annular space between a surface (7a) defining anopening for said rotatable shaft through a stationary Wall (7) of the combustion engine(l) and an outer periphery surface of the rotatable shaft. The sealing member (8)comprises a radially outer portion (8b, 8c) to be fiXedly arranged to the surface (7a)defining said opening. The crankshaft gear (3) comprises a portion provided With asmooth outer periphery surface (3b) and that the sealing member (8) comprises aradially inner portion comprising at least one sealing lip (8a) configured to sealingly abut against the outer periphery surface (3b) of the crankshaft gear (3). (Pig. 2)
    公开号:SE1651554A1
    申请号:SE1651554
    申请日:2016-11-28
    公开日:2018-05-29
    发明作者:Gångfeldt Hans；Fors Stefan
    申请人:Scania Cv Ab；
    IPC主号:
    专利说明:

    A sealing arrangement for a rotatable shaft of a combustion engine BACKGROUND TO THE INVENTION AND PRIOR ART The present invention relates to a sealing arrangement for a rotatable shaft of a combustion engine, according to the preamble of claim l.
    A rotatable shaft of a combustion engine extends through an opening in a housingdefining an inner space of the combustion engine. The annular space between an edgesurface defining said opening in the housing and the rotatable shaft has to be sealed inorder to prevent leakage of engine oil from the inner space of the combustion engineand ingress of contaminants from the surrounding into the combustion engine. Aconventional sealing member for this purpose may comprise a radial outer portion,which is fiXedly attached to the surface defining the opening in said housing and aradial inner portion comprising at least one sealing lip to be in contact with a surface ofa flywheel portion extending through the opening. However, a flywheel is a castcomponent and the smoothness of its suiface is not of highest quality. Consequently,the sealing properties of a conventional sealing arrangement is not exceptional.Furthermore, the flywheel obstructs the view of the sealing member during anassembly process of the flywheel. Consequently, it is difficult to move the flywheel toan intended mounting position in relation to the sealing member and it is not possibleto check if the sealing lip of the sealing member abuts against the surface of theflywheel in a sealingly manner. Thus, the assembly process of the flywheel and the sealing member is relatively complicated to perform.
    CN 203796438 U shows a sealing member preventing leakage of engine oil at anoutput of a crankshaft in a combustion engine. The sealing member comprises twosealing parts namely an outer sealing ring to be fiXedly attached to a surface of acrankshaft housing and an inner sealing ring to be fiXedly attached to an outer suifaceof a crankshaft gear. Thus, the sealing parts provides a rotary movement in relation toeach other. Each sealing ring comprise a sealing lip abutting against an inner surface ofthe other sealing ring in order to prevent an oil flow through a space between said twosealing parts. This type of sealing member can be defined as cassette seal. Cassetteseals are relatively expensive and the assembly process includes the steps to fiXedly attach the respective sealing parts to the flywheel housing and the crankshaft gear.
    SUMMARY OF THE INVENTION The object of the invention is to provide a sealing arrangement for a rotatable shaft of acombustion engine having an ineXpensive design and a reliable function at the same time as it is easy to assemble.
    These objects are achieved With the features defined in claim l. The sealing membercomprises a radially inner portion provided With at least one sealing lip configured toabut an outer periphery smooth surface of the crankshaft gear. Usually, the crankshaftgear is in contrary to the flyWheel manufactured by a material having a smooth surface.Thus, a sealing member provided With a sealing lip abutting against a surface of such aportion of the crankshaft gear has excellent sealing properties. The crankshaft gear isalso usually manufactured of a more Wear resistant material than the flyWheel. Thismay result in an increased lifetime of the sealing. Furthermore, the above mentioneddesign makes it possible to complete the assembly of the sealing member before it istime to assemble the flyWheel. lt is also possible to check that the sealing member hasbeen assembled in a correct position before the flyWheel is assembled. Thus, theassembly processes of the sealing member and the flyWheel are performed in sequenceand independently of each other. Consequently, the assembly process of the sealingarrangement Will be relatively simple. Furthermore, the cost for the sealing arrangement is low since the sealing member is of an ineXpensive type.
    According to an embodiment of the present invention, the sealing lip is configured toabut against an outer periphery surface of the crankshaft gear With a resilient force. Inorder to provide an excellent sealing between a sealing lip and a surface, it is suitablethat the sealing lip abuts against the surface With a force. The sealing lip can bemanufactured by a material With elastic properties such that the sealing lip in a bentstate abuts against the surface of the crankshaft gear With a resilient force.
    Alternatively, a spring member can be attached to the sealing lip.
    According to an embodiment of the present invention, the crankshaft gear ismanufactured of a hardened steel material. ln order to transn1it a torque in thecombustion engine, the crankshaft gear has to be manufactured by a hardened material.Such a hardened material can be provided With a very smooth surface. ln this case, it ispossible to use a someWhat larger crankshaft gear With an added portion provided With said smooth outer periphery surface. Said outer periphery surface may be arranged at an aXial distance from a toothed portion of the crankshaft gear. In this case, thecrankshaft gear Will be someWhat larger than a conventional crankshaft gear. Thediameter of the added portion of the crankshaft gear may be smaller than the diameter of the toothed portion.
    According to an embodiment of the present invention, the flyWheel comprises asurface, Which at least partly covers said annular space at one side of the sealingmember. Such a design of the flyWheel blocks the annular space and reduces the riskof oil leakage. Said surface of the flyWheel may cover the entire annular space.
    Furthermore, such a part of the flyWheel provides a protection for the sealing member.
    According to an embodiment of the present invention, the sealing member comprisesan outer sealing ring designed to be fiXedly attached to the surface defining saidopening by means of a pressing force. The outer sealing ring may have a someWhatlarger diameter than the opening in a non-assembled state and some elastic propertiessuch that it is possible to pushing the sealing member to a mounting position into saidopening. In the mounting position, the outer sealing ring acts With a radially outWardlydirected force on the surface defining maintaining the sealing member in a fixedposition in the opening. The outer sealing ring may comprise a metal ring providedWith a contact surface of a sealing material. The metal ring provides suitable resilientproperties to the outer sealing ring and the sealing material ensures that there Will be no leakage between the outer sealing ring and the surface defining the opening.
    According to an embodiment of the present invention, the stationary Wall is a part of aflyWheel housing. A flyWheel housing is usually used to enclose the flyWheel and ashaft portion of the combustion engine provided on the flyWheel side. Furthermore, itprovide a Wall section for an inner space of the combustion engine containing engineoil. The flyWheel may be a cast iron component. A cast iron component has a relativelyrough surface. Consequently, the sealing properties for a sealing member With a sealing lip abutting against a surface of a cast iron component is not exceptional.
    According to an embodiment of the present invention, the crankshaft journal, thecrankshaft gear and the flywheel are connected to each other by common bolts. Thecomponents may be provided With boltholes in corresponding position Whereupon theya fiXedly connected to each other by bolts. The bolts are applied in a last step of the assembly process of the sealing arrangement.
    According to an embodiment of the present invention, the flywheel comprises a guide portion to be arranged in a radial gap between a surface defined by the crankshaft gearand a surface defined by the crankshaft journal. Such a design facilitates the movementof the flywheel to a predetermined mounting position in relation to the crankshaft gear and the crankshaft journal before they are fiXedly connected to each other.
    BRIEF DESCRIPTION OF THE DRAWINGS A preferred embodiment of the invention is described below by way of an example with reference to the attached drawings, on which: Fig. l shows a sealing arrangement for a rotatable shaft of a combustion engine and Fig. 2 shows the sealing arrangement in Fig. l more in detail.
    DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THEINVENTION Fig. l shows a cross sectional view of a part of a rotatable shaft of a combustionengine l. This part of the shaft comprises a crankshaft journal 2, a crankshaft gear 3and a flywheel 4. The crankshaft journal 2 constitutes an outer end of a crankshaft. Thecrankshaft gear 3 comprises a toothed portion 3a to be in engagement with a not visiblegear wheel in the combustion engine. In this case, the crankshaft gear 3 comprises aportion with a periphery surface 3b arranged at an aXial distance from the toothedportion 3a. The crankshaft gear 3 is manufactured by a hardened steel material. Theflywheel 4 is arranged on the outside of the combustion engine l. The flywheel 4 ismanufactured of cast iron. The flywheel 4 comprises an annular guide portion 4aconfigured to be arranged in an annular gap defined by a surface 3c of the crankshaft gear 3 and a surface 2a defined by the crankshaft journal 2.
    The flywheel 4 is rotatably arranged by means of a bearing 5. The crankshaft journal 2,the crankshaft gear 3 and the flywheel 4 comprises bolt holes such they in anassembled state are connected to each other by means of common bolts 6. A flywheelhousing 7 comprises a wall section lirniting an inner space of the combustion engine l.The wall section of the flywheel housing 7 comprises an opening defined by a circular edge surface 7a. The rotatable shaft eXtends through the opening in the flywheel housing 7. A sealing member 8 is arranged in an annular space formed between theedge surface 7a defining said opening and the periphery surface 3b of the crankshaftgear 3. The object of the sealing member 8 is to prevent leakage of oil from thecombustion engine l to the surrounding via said annular space and to prevent ingressof impurities from the surrounding to the inner space of the combustion engine l. Theflywheel 4 comprises a surface 4b covering the annular space on an outside of the sealing member 8.
    Fig 2 shows the sealing member more in detail. The sealing member 8 comprises anouter sealing ring in the form of a metal ring 8b provided with a sealing material 8c.The sealing ring is designed such that it has a somewhat larger diameter in a non-assembled state than the opening defined by the edge surface 7a. Thus, the sealingmember has to be pressed into the opening to a mounting position. In the assembledstate, the outer sealing ring acts with a pressing force on the edge surface 7a such thatthe sealing member 8 will be fiXedly arranged in the opening. The eXistence of thesealing material 8c ensures that no leakage will arise between the outer surface of theouter sealing ring and the edge surface 7a of the flywheel housing 7. The sealingmember 8 comprises an inner sealing portion in the form of a sealing lip 8a. Thesealing lip has elastic properties such that it in a bent state abuts against the outerperiphery surface 3b of the crankshaft gear 3 with a resilient force. Since the crankshaft gear 3 is manufactured of a hardened steel material, it has a very smooth outer periphery surface 3b. Due to this fact, it is possible to provide a very tight sealing between the sealing lip 8a and the rotatable outer periphery surface 3b of thecrankshaft gear 3.
    Before the sealing member 8 is assembled, it is possible to assemble the crankshaft gear 3 in contact with associated gear wheels in the combustion engine l and attach the crankshaft housing 7 in an intended position. After that, the sealing member 8 ispressed into the annular space between the edge surface 7a of flywheel housing 7 andthe outer periphery surface 3b of the crankshaft gear 3. ln an assembled state, the outersealing ring 8b, 8c acts with a radially outwardly pressing force on the edge surface 7aof the flywheel housing 7 such that the sealing member 8 is fiXedly arranged in saidannular space. Furthermore, the sealing lip 8a abuts with a resilient force against theouter periphery surface 3b of the crankshaft gear 3 in a bent state. There is nothingobstructing the view of the annular space during the assembly process of the sealing member 8, which facilitates the assembly process. Furthermore, it is easy to check if the sealing member 8 has been assembled in a correct manner in the annular space.After that, the flywheel 4 is to be assembled. The guide portion 4a of the flywheel 4 ismoved into the annular gap formed by the surface 3b of the crankshaft gear 3 and thesurface 2a of the crankshaft joumal 2. Thus, the assembly process of the sealingmember 8 and the flywheel 7 is performed in sequence in two separate steps.Consequently, it is simple to assemble the sealing member 8 and associated components 3, 4, 7.
    The invention is in no Way limited to the embodiment to Which the draWing refers but may be Varied freely Within the scopes of the claims.
    权利要求:
    Claims (12)
    [1] 1. l. A sealing arrangement for a rotatable shaft of a combustion engine, Wherein therotatable shaft comprises a crankshaft journal (2), a crankshaft gear (3) and a flyWheel(4), Wherein the sealing arrangement comprises a sealing member (8) configured to bearranged in an annular space between a surface (7a) defining an opening for saidrotatable shaft through a stationary Wall (7) of the combustion engine (l) and an outerperiphery surface of the rotatable shaft, and Wherein the sealing member (8) comprisesa radially outer portion (8b, 8c) to be fiXedly arranged to the surface (7a) defining saidopening, characterized in that the crankshaft gear (3) comprises a portion providedWith a smooth outer periphery surface (3b) and that the sealing member (8) comprisesa radially inner portion comprising at least one sealing lip (8a) configured to sealingly abut against the outer periphery surface (3b) of the crankshaft gear (3).
    [2] 2. A sealing arrangement according to claim l, characterized in that the sealing lip (8a)is configured to abut against an outer periphery surface (3b) of the crankshaft gear (3) With a resilient force.
    [3] 3. A sealing arrangement according to claim l or 2, characterized in that the crankshaft gear (3) is manufactured by a hardened steel material.
    [4] 4. A sealing arrangement according to any one of the preceding claims, characterizedi_n that said outer periphery surface (3b) is arranged at an aXial distance from a toothed portion (3a) of the crankshaft gear (3).
    [5] 5. A sealing arrangement according to any one of the preceding claims, characterizedi_n that the flyWheel (4) comprises a surface (4b) Which at least partly covers the annular space at one side of the sealing member (8).
    [6] 6. A sealing arrangement according to any one of the preceding claims, characterizedi_n that the sealing member (8) comprises an outer sealing ring (8b, 8c) designed to be fiXedly attached to the surface (7a) defining said opening.
    [7] 7. A sealing arrangement according to claim 6, characterized in that the outer sealing ring comprises a metal ring (8b) provided With a contact surface of a sealing material(8c).
    [8] 8. A sea1ing arrangement according to any one of the preceding c1aims, characterized i_n that the stationary Wall is a part of a flyWhee1 housing (7).
    [9] 9. A sea1ing arrangement according to any one of the preceding c1aims, characterized i_n that the flyWhee1 (4) is a cast component manufactured of cast iron.
    [10] 10. A sea1ing arrangement according to any one of the preceding c1aims, characterizedi_n that the crankshaft journal (2), the crankshaft gear (3) and the flyWhee1 (4) are connected to each other by common bolts (6).
    [11] 11. A sea1ing arrangement according to any one of the preceding c1aims, characterizedi_n that the flyWhee1 (4) comprises a guide portion (4a) to be arranged in a radia1 gapbetween a radia1 outer surface (3c) defined by the crankshaft gear (3) an inner radia1surface (2a) defined by the crankshaft joumal (2).
    [12] 12. A combustion engine comprising a sea1ing arrangement according to any one of the preceding c1aims.
    类似技术:
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    同族专利:
    公开号 | 公开日
    SE542479C2|2020-05-19|
    BR112019010586A2|2019-09-17|
    EP3545218A1|2019-10-02|
    US20200080511A1|2020-03-12|
    WO2018097792A1|2018-05-31|
    KR20190077105A|2019-07-02|
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    CN100590314C|2004-08-09|2010-02-17|丰田自动车株式会社|Starting apparatus|
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    CN200958430Y|2006-09-22|2007-10-10|陈一军|Rear oil-seal assembly structure of crank shaft for diesel-oil engine|
    JP2010144827A|2008-12-18|2010-07-01|Toyota Motor Corp|Oil seal press fitting structure|
    JP5310869B2|2009-12-15|2013-10-09|トヨタ自動車株式会社|Oil seal structure|
    CN201606428U|2010-01-21|2010-10-13|芜湖杰诺瑞汽车电器系统有限公司|One-way clutch of automobile starting motor|
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    JP6013230B2|2013-02-27|2016-10-25|株式会社小松製作所|Oil seal|
    CN203796438U|2014-02-13|2014-08-27|上海柴油机股份有限公司|Device for improving sealing performance of crankshaft oil seal of engine|
    CN104405526A|2014-11-07|2015-03-11|广西玉柴机器股份有限公司|Crankshaft front-end structure of diesel engine|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1651554A|SE542479C2|2016-11-28|2016-11-28|A combustion engine comprising a sealing arrangement for a rotatable shaft|SE1651554A| SE542479C2|2016-11-28|2016-11-28|A combustion engine comprising a sealing arrangement for a rotatable shaft|
    CN201780072478.7A| CN109983262B|2016-11-28|2017-11-24|Sealing arrangement for a rotatable shaft of a combustion engine|
    EP17809067.6A| EP3545218A1|2016-11-28|2017-11-24|A sealing arrangement for a rotatable shaft of a combustion engine|
    PCT/SE2017/051166| WO2018097792A1|2016-11-28|2017-11-24|A sealing arrangement for a rotatable shaft of a combustion engine|
    BR112019010586A| BR112019010586A2|2016-11-28|2017-11-24|sealing arrangement for a rotary shaft of a combustion engine|
    US16/462,587| US20200080511A1|2016-11-28|2017-11-24|A sealing arrangement for a rotatable shaft of a combustion engine|
    KR1020197017487A| KR20190077105A|2016-11-28|2017-11-24|Sealing device for rotary shaft of combustion engine|
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