201026916 六、發明說明： 【發明所屬之技術領域】 本發明係關於一種用於牽伸配置之頂滾輪，其包含： 一轴中心件及具有轴承螺栓之兩個轴頸轴承，軸承螺栓經 配置於該轴中心件之相反侧上，且在其自由端上配置至少 一各別滚動軸承，該滾動軸承用於安裝一外環。本發明進 一步係關於一種用於生產及組裝頂滾輪之方法。 【先前技術】 自德國公開申請案DE 20 61 433 A1或DE 20 61 434 A1已知開始提到的類型之頂滾輪。de 20 61 433 A1及DE 20 61 434 A1描述一種具有管狀中心件之頂滾輪’其中藉由 兩個分開的半軸來緊固軸頸軸承。藉由非切割成形自管部 分生產轴中心件。 然而’自公開申請案DE 20 61 433 A1或DE 20 61 434 A1已知之頂滾輪迄今已僅用於頂滾輪之特殊設計中，例 如’當外部軸承直徑僅比轴直徑稍大，以便能夠用小的徑 向裝設空間施加仍然儘可能大的像膠蓋之橫截面時。藉由 雙侧轴承密封件，在每一情況下需要個別密封件構形。頂 滾輪之此個別設計不適合於大量各種各樣的類型之應用。 【發明内容】 本發明之目的為以可使頂滾輪之生產及組裝標準化及 自動化之方式簡化用於牽伸配置之頂滚輪。 201026916 根據本發明，藉由申請專利範圍第1項之特性化特徵 及方法申請專利範圍第15項達成此目的。 進步有利的發展為附屬申請專利範圍之主體。 根據申請專利範圍第1項，提議將各種軸中心件提供 用於各別頂滾輪且使轴中心件適合頂滚輪攜載及配重臂之 各別 '不同區段及/或_物形狀，其中孔經配置於該等抽 中件中之任側上以套接該等軸承螺栓，安裝所需之所 _有軸承裝置經配置於該轴承螺栓上，使得#組裝該頂滾輪 時，可獨立於與該滾動軸承及外環一起使用之軸承螺栓進 行軸中心件之選擇，以適合不同區段及/或鞍形物形狀。軸 中心件之簡化及調適之構形使得在牽伸配置上的區段及鞍 形物形狀之所有變化特徵經整合至轴中心件中，其允許對 不同類型的牵伸配置之靈活及多樣的使用，無需在頂滾輪 之生產及組裝期間進行軸承螺栓之交換或調適。 詳言之，在軸中心件中之任一側上的孔可始終具有均 _勻深度以用於壓入軸承螺栓。此導致將轴承螺拴按壓至轴 中心件之孔内的始終相同之按壓動作。 軸中心件之在末端處的直徑可此外始終對應於軸中心 件之最大存在直徑。 軸中心件之最大存在直徑較佳地位於該軸中心件與外 環之重疊區域中。因此使介於軸中心件與外環之間的待密 封的環面最小化。 此外’用以在頂滚輪攜載及配重臂之鞍形物中插入頂 滚輪的軸中心件之階梯狀區之直徑及長度可根據各種類型 201026916 的鞍形物形狀之直徑及寬度而變化 為此目的，在軸中心件 的。藉由此措施可易於實現 的鞍形物形狀之多樣性，自 有利。 上的直徑分段之過渡應為均勻 適合各種類型之牽伸配置所需 製造經濟之觀點看，生產特別 〃以上歹,J出的滾輪之發展用u在結構上設計頂滾輪， 使得可用可用於所有類型之牽伸配置之極少的相同零件且 以高度靈活性在大量變體中以最低可能的裝設、處理及組 成本來生產其。根據本發明之轴中心件（獨立於變體） 至少在與轴承螺栓之重疊區域中始終具有全部類型範圍之 最大存在純料標準直彳i。此外，根據“位置中之直 徑及寬度’對於具體類型之鞍形物形狀，中心件具有與 最*多種多樣的牽伸配置之具體導桿及上部帶固持器合作之 彼等中心件部分。由於在軸中心件與外環之重疊區域中之 直j方面的軸中心件之標準化，鞍形物側密封件亦減小至 一早一實施例’其簡化了零件規劃且僅需要—種組裝裝 置。在轴中心件上的直徑分段之過渡之均句構形允許以簡 化方式應付鞍形物形狀之多樣性。此外，在軸中心件上的 直徑分段之均勻過渡允許藉由機器控制之可快速轉換程式 用同樣的工具以最低可能花費生產鞍形物形狀之變體。另 -優勢在於’尤其由於距面向軸中心件之滾動軸承之小間 距，轴中心件之重疊區域對在軸承螺栓上的軸承之良 定有影響。 德 轴承螺栓可較佳地具有均勻長度，其與使用之軸中心 201026916 件無關。與軸中心裤：φ & π + a *…I 度相結合，軸承螺栓 =終具有I壓人配合長度。以此方式，對於頂滾輪之全 口不7型，>咸少了用於在生產期間且尤其在組裝期間之 轉換的花費。軸㈣栓之壓人動作始終㈣，使 段引起變化之情況下，僅必須在組裝配置之_側：： 變之區段將壓入單元移位。 K據改 詳言之，軸承螺栓具有均勻直徑。此簡化了生產因 ❹ 為對於所有軸承螺栓’棒形起始材料始終具有同樣的尺 寸’而與用於某一牵伸配置類型的頂滾輪之構形無關。 在此情況下，壓入深度可始終至少對應於軸承螺栓之 外徑的1.5倍。對於所使用之各種轴中心件，固定於此值已 證明在轴承螺栓與軸中心、件之連接的穩定性方面特別有 利。 軸承螺栓及外環可較佳地在每一情況下具有球形滾動 體軌道，其相對於外環之徑向中心平面對稱配置。此處， 〇軸承螺栓及外環之滾動體執道之輪緣高度應處於滾動體直 徑之5%與15%之間。藉由減小輪緣高度來使軸承螺栓之直 徑最佳化且固定壓入配合長度及軸中心件之範圍直至距滚 動軸承之罩背部（cage back)的小間距，允許在軸承螺栓 與軸中〜件之間的功能上牢固連接（甚至在短的頂滾輪區 段及小且廣的鞍形物形狀之情況下）。 在較佳的發展中，除了滾動體軌道外的轴承螺栓之表 面可為不分段的。此對軸承螺栓之生產過程的簡化有影 響，因為軸承螺栓不必經歷任何表面機械加工（除了用於 201026916 滾動體軌道之凹座外）。 有利地，在轴頸轴承中提供密封唇及蓋，藉由密封辰 及蓋，相對於周圍環境密封至少一滾動軸承。在此情况^ 之密封唇及蓋具有相同外徑及相同外部輪廓。 在此情況下’在外轴承的面向轴承螺栓之内部上，外 軸承可具有徑向凹座，其用以緊固密封唇或蓋。在改變軸 中心件的選擇以用於適合另一區段及/或鞍形物形狀之情況 下，由於連接至密封部件、軸中心件及外環的組件之標準 化，因此亦可使密封部件標準化。 根據方法項申請專利範圍帛15項，提議為了適合不同 區段及/或鞍形物形狀，轴中心件具備—中心部分，其適合 此等不同區段及/或鞍形物形狀，同時軸中心件之用以套接 轴承螺栓的末端部分在其外徑及孔深度方面被標準化安 裝所需之所有軸承褒置經配置於該軸承螺栓上，使得在頂 滾輪之組裝期μ ’可獨立於與滾動軸承及外環一起使用的 輛承螺栓進行軸中心件之選擇以適合不同區段及/或鞍形物 形狀。 中展示之實施例更詳細地描述本 以下將借助於在圖式 發明。 【實施方式】 圖1描繪頂滾輪1 兩個軸頸軸承3。夂 意圖，其包含-轴中心件2及 由其可將轴頸& _顯轴承3具有：一軸承螺栓4,藉 由其ΤΓ將軸頸軸承3壓 至轴中心件2中之孔5内；及至 201026916 少-滾_承6’其心安裝 體6及罩“夕土加〜 ’。在圖1中，包含滾動 上。為了相對;動軸承經配置於軸承螺栓4之自由端 ⑼對於周圍環境密封轴目由蠕 2之側上提供-密封唇8,同時將閉合承蓋==中心件 “ 2之側上。為了達成滾動 與離軸中 頸軸承3之内部中在 U潤滑，可在軸 藉由引入於外環7= 間提供潤滑油供應。 密封唇邛上的徑向凹座11將蓋子9或 «緊固至轴頸軸承3’蓋 座中。密封唇8為圓柱形且具有心：广在該等凹 唇8搁在外環7之内部上及轴中I:::::;密封 上延伸，如圖1中所示。 件2之表面上，在軸向 根據圖1之轴中心#. 向蘇圍ς丨以 有—中心部分1G，其在其軸 與牵伸配置之具體導桿或上部帶固持器對應。 在轴中心件2與轴頸轴承3之重疊區域中，轴中心件2具 φ 有〃用於各種輕形物形狀及區段的中心部分10之變化無 ，的始終具有最大存在直徑D且對於所有軸中心件2皆經 &準化之分。轴中心件2選擇性地具有防腐餘及防磨損 之塗層。 在大於/等於8〇 mm之較大區段之情況下，較佳地自具 有精確谷差直役之棒材料生產軸中心件2,該精確容差直徑 對應於重叠區域中的軸中心件2之標準化直徑〇。 對於小於/等於8〇 mm之較短區段，可選擇性地自具有 標準化外徑之管生產軸中心件2，該管僅在具有精密量測容 差之區域中經機械修整，諸如，在用於套接具有均勻長度 201026916 之轴承螺栓4之孔5中。軸中心件2之生產及其上的轴頸 轴承3之組裝得以簡化，因為孔5之孔深度b經標準化， 因此轴承螺栓4至軸中心件2内之壓入深度b始終相同， 而與外環7之尺寸無關。 圖2展示具有比圖1中大的區段之頂滾輪該结構 與圖1中展示的頂滚輪1之實施例相同。根據圖1之頂滚 輪1與根據圖2之頂滚輪1，之間的差異僅在於軸中心件2, 之長度（詳言之’在頂滾輪1，之對應於適合於另一牵伸配 置或類型的牵伸配置之不同區段及/或鞍形物形狀的中心部 分1〇’之軸向範圍S2中）及外環7,之較長構形中。因此， 壓入深度B在此處亦與圖1中描述之變體相同。 參有圖1及圖3更詳細地描述根據本發明的頂滾輪 之軸頸軸承3。為了簡化及標準化，軸承螺栓4具有均勻书 度L及均勻直徑d。對於所有軸中心件2、2，，軸承螺栓、 之長度L及均句直徑“目同’而與軸中心件2、2·之軸向車 =S2無關。轴承螺栓4不分段且僅具有在實心區" 削成的兩個球形軌道12，該等球形軌道12用以導弓丨滚_ 士應於軸承螺栓4上之軌道12， 、 球形軌道14。#冰1 ^ 在其内部亦具^ 此外，如已陳述，將徑向凹座u 之内部’且用於密封部件之配置。此外 Μ 全對稱，心成相對於其中心平面… 道12及外環的輪缘H轴承螺检4之車 5%至15%的範圍 度處於滾動體直徑“201026916 VI. Description of the Invention: [Technical Field] The present invention relates to a top roller for a drafting configuration, comprising: a shaft center member and two journal bearings having bearing bolts, the bearing bolts being configured On the opposite side of the shaft center member, at least one respective rolling bearing is disposed on the free end thereof for mounting an outer ring. The invention is further directed to a method for producing and assembling a top roller. [Prior Art] A top roller of the type mentioned at the outset is known from German Published Application No. DE 20 61 433 A1 or DE 20 61 434 A1. De 20 61 433 A1 and DE 20 61 434 A1 describe a top roller 'with a tubular central part' in which the journal bearing is fastened by two separate half shafts. The shaft center piece is produced from the tube portion by non-cut forming. The top roller known from the publications DE 20 61 433 A1 or DE 20 61 434 A1 has heretofore been used only in the special design of the top roller, for example 'When the outer bearing diameter is only slightly larger than the shaft diameter, so that it can be used small The radial mounting space is still applied as much as possible when the cross section of the rubber cover is used. With a double bearing seal, individual seal configurations are required in each case. This individual design of the top roller is not suitable for a wide variety of types of applications. SUMMARY OF THE INVENTION It is an object of the present invention to simplify a top roller for a drafting arrangement in a manner that standardizes and automates the production and assembly of the top rollers. 201026916 According to the present invention, this object is achieved by claiming the fifteenth item of the characterization feature and method of claim 1 of the scope of the patent application. The development of favorable progress is the subject of the scope of the patent application. According to the scope of claim 1, it is proposed to provide various shaft center members for the respective top rollers and to adapt the shaft center members to the respective 'different sections and/or shape of the top roller carrying and counterweight arms, wherein The holes are disposed on either side of the pumping members to sleeve the bearing bolts, and the bearing device required for mounting is disposed on the bearing bolts, so that when the top roller is assembled, it can be independent of The bearing bolts used with the rolling bearing and the outer ring are selected for the shaft center member to suit different sections and/or saddle shapes. The simplified and adapted configuration of the shaft center member allows all of the varying features of the section and saddle shape in the drafting configuration to be integrated into the shaft center member, which allows flexibility and variety of different types of drafting configurations It eliminates the need to exchange or adjust bearing bolts during production and assembly of the top rollers. In particular, the holes on either side of the shaft center member can always have a uniform depth for pressing into the bearing bolts. This results in the same pressing action of pressing the bearing screw into the bore of the shaft center member. The diameter of the shaft center piece at the end may additionally always correspond to the maximum presence diameter of the shaft center piece. The maximum presence diameter of the shaft center member is preferably located in the overlap region of the shaft center member and the outer ring. Therefore, the torus to be sealed between the shaft center member and the outer ring is minimized. In addition, the diameter and length of the stepped portion of the shaft center member for inserting the top roller into the saddle of the top roller carrying and the weight arm can be varied according to the diameter and width of the saddle shape of each type 201026916. For this purpose, the shaft is in the center piece. The diversity of saddle shapes that can be easily achieved by this measure is advantageous. The transition of the upper diameter section should be a manufacturing economy that is evenly suitable for various types of drafting configurations. The production is particularly difficult. The development of the roller of the J is designed to design the top roller so that it can be used. All types of drafting configurations have very few identical parts and are produced with a high degree of flexibility in a large number of variants with the lowest possible installation, handling and composition. The shaft centerpiece (independent of the variant) according to the invention always has a maximum presence of the pure gauge standard in all types of areas at least in the area of overlap with the bearing bolts. In addition, depending on the "diameter and width in position" for a particular type of saddle shape, the centerpiece has its centerpiece portion that cooperates with the particular guide rod and upper belt retainer of the most diverse variety of draft configurations. In the normalization of the shaft center piece in the straight region of the overlap between the shaft center piece and the outer ring, the saddle side seal is also reduced to an early embodiment, which simplifies part planning and requires only an assembly device. The uniformity of the transition of the diameter segments on the shaft center member allows for a simplification of the diversity of the saddle shape. Furthermore, the uniform transition of the diameter segments on the shaft center member allows for machine control. The quick conversion program uses the same tool to produce a variant of the shape of the saddle at the lowest possible cost. Another advantage is that 'in particular, due to the small spacing of the rolling bearings from the axial center piece, the overlap of the shaft center pieces on the bearing bolts The bearing of the bearing has an effect. The German bearing bolt can preferably have a uniform length, which has nothing to do with the axis center 201026916 used. With the shaft center pants: φ & π + a *...I degree combination, bearing bolt = end I have a press fit length. In this way, for the top of the top roller is not type 7, & is less salty for conversion during production and especially during assembly Cost. The axis (4) pin press action always (4), in the case of the segment causing the change, only must be on the side of the assembly configuration:: The variable section will be pressed into the unit. K according to the details, bearing bolt It has a uniform diameter. This simplifies the production because it is always the same size for all bearing bolts 'rod-shaped starting material' and is independent of the configuration of the top roller for a certain drafting configuration type. In this case, The press-in depth can always correspond at least to 1.5 times the outer diameter of the bearing bolt. For the various shaft center parts used, fixing this value has proven to be particularly advantageous in terms of the stability of the bearing bolt to the shaft center and the connection of the parts. The bolt and the outer ring preferably have in each case a spherical rolling body track which is arranged symmetrically with respect to the radial center plane of the outer ring. Here, the rim height of the rolling bearing body of the bearing bolt and the outer ring Between 5% and 15% of the diameter of the rolling element. The diameter of the bearing bolt is optimized by reducing the height of the rim and the range of the fixed press fit and the center of the shaft is up to the back of the cover of the rolling bearing ( The small spacing of the cage back) allows for a functionally secure connection between the bearing bolt and the shaft-to-shaft (even in the case of short top roller sections and small and wide saddle shapes). In development, the surface of the bearing bolts other than the rolling element rails may be non-segmented. This has an impact on the simplification of the production process of the bearing bolts, since the bearing bolts do not have to undergo any surface machining (except for the 201026916 rolling element track). Advantageously, a sealing lip and a cover are provided in the journal bearing, and at least one rolling bearing is sealed relative to the surrounding environment by sealing the cover and the cover. In this case, the sealing lip and the cover have the same outer diameter and the same External contour. In this case, on the inside of the outer bearing facing the bearing bolt, the outer bearing may have a radial recess for fastening the sealing lip or cover. In the case of changing the choice of the shaft center piece for adapting to another section and/or saddle shape, the sealing part can also be standardized due to the standardization of the components connected to the sealing part, the shaft center piece and the outer ring . According to the scope of application of the method item 帛15, it is proposed that in order to adapt to different sections and/or saddle shapes, the shaft center member has a central portion adapted to the different sections and/or saddle shapes, while the shaft center All the bearing arrangements required for the end portion of the sleeve bearing bolt to be standardized for its outer diameter and hole depth are disposed on the bearing bolt so that the assembly period μ ' can be independent of The bearing bolts used with the rolling bearing and the outer ring are selected for the shaft center member to suit different sections and/or saddle shapes. The embodiments shown in the drawings are described in more detail below with the aid of the drawings. [Embodiment] FIG. 1 depicts two journal bearings 3 of a top roller 1. In the meantime, it comprises a shaft center member 2 and by which the journal & _ bearing 3 has: a bearing bolt 4, by which the journal bearing 3 is pressed into the bore 5 in the shaft center member 2 ; and to 201026916 less - roll _ 6' its core mounting body 6 and cover "Xi Tujia ~". In Figure 1, including the rolling. For the relative; the moving bearing is placed at the free end of the bearing bolt 4 (9) for the surrounding The environmental seal shaft is provided by the side of the creeper 2 - the sealing lip 8 and the closing cap == the center piece "on the side of the 2". In order to achieve U-lubrication in the interior of the rolling and off-axis neck bearing 3, a supply of lubricating oil can be provided between the shaft and the outer ring 7=. A radial recess 11 on the sealing lip folds the cover 9 or « into the journal bearing 3' cover. The sealing lip 8 is cylindrical and has a heart: the recess 8 rests on the inside of the outer ring 7 and extends in the shaft I::::;; as shown in Fig. 1. On the surface of the member 2, in the axial direction according to the axis center of Fig. 1, the center of the shaft is 1G, which corresponds to a specific guide rod or upper belt holder of the drafting arrangement. In the region of overlap of the shaft center member 2 and the journal bearing 3, the shaft center member 2 has φ for the variation of the central portion 10 of the various light object shapes and sections, and always has the maximum existence diameter D and All of the shaft center members 2 are subjected to & normalization. The shaft center member 2 selectively has a coating that is resistant to corrosion and wear. In the case of a larger section greater than/equal to 8 mm, the shaft center piece 2 is preferably produced from a bar material having a precise valley difference, which corresponds to the shaft center piece 2 in the overlap region. The standardized diameter 〇. For shorter sections less than/equal to 8 mm, the shaft centerpiece 2 can be selectively produced from a tube having a standardized outer diameter, the tube being mechanically trimmed only in areas with precision measurement tolerances, such as It is used to sleeve the hole 5 of the bearing bolt 4 with a uniform length of 201026916. The production of the shaft center member 2 and the assembly of the journal bearing 3 thereon are simplified, since the hole depth b of the hole 5 is standardized, so that the press-in depth b in the bearing bolt 4 to the shaft center member 2 is always the same, and The size of the ring 7 is irrelevant. Figure 2 shows the top roller having a section larger than that of Figure 1 which is identical to the embodiment of the top roller 1 shown in Figure 1. The difference between the top roller 1 according to Fig. 1 and the top roller 1 according to Fig. 2 is only the length of the shaft center member 2 (in detail, in the top roller 1, which corresponds to another drafting configuration or The different sections of the type of drafting arrangement and/or the central portion of the shape of the saddle shape 1'' in the axial extent S2) and the outer ring 7, the longer configuration. Therefore, the indentation depth B is also here the same as the variant described in FIG. The journal bearing 3 of the top roller according to the present invention will be described in more detail with reference to Figs. 1 and 3. For simplification and standardization, the bearing bolt 4 has a uniform degree of reading L and a uniform diameter d. For all shaft center members 2, 2, the bearing bolts, the length L and the average sentence diameter are "same" and are independent of the axial center member 2, 2· axial vehicle = S2. The bearing bolts 4 are not segmented and only have In the solid zone, the two spherical orbits 12 are cut into pieces, and the spherical orbits 12 are used to guide the bows to the rails 12 on the bearing bolts 4, and the spherical orbits 14. #冰1^ In addition, as already stated, the inner portion of the radial recess u will be used for the arrangement of the sealing members. In addition, the Μ is fully symmetrical, the core is formed relative to its center plane... The rim of the rim 12 and the outer ring H bearing thread check The range of 5% to 15% of the 4 cars is in the rolling element diameter"
軌道12、14在轴承螺拾4及外環7J 201026916 之配置經選擇，使得在面向i 9的側上之軸承螺栓4具有 最大突出’其對應於軸承螺栓4之直徑」的m倍，而在 面向雄封唇8之侧上，突出對應於軸承螺栓4之直徑d的 至乂 1.5倍。外環7及軸承螺检4之對稱形狀確保了在製造 及組裝程序中零件的非常簡單且可靠的供應。詳言之，其 直幵v狀及平滑表面減少了來自在組裝前的製造步驟之塵土 ❹The arrangement of the rails 12, 14 in the bearing screw 4 and the outer ring 7J 201026916 is selected such that the bearing bolt 4 on the side facing i 9 has a maximum protrusion 'which corresponds to the diameter of the bearing bolt 4", and On the side facing the male lip 8, the projection corresponds to a diameter d of the bearing bolt 4 of 1.5 times. The symmetrical shape of the outer ring 7 and the bearing screw 4 ensures a very simple and reliable supply of parts during the manufacturing and assembly process. In particular, its straight v-shaped and smooth surface reduces dust from manufacturing steps prior to assembly.
及碎屑黏附之危險，且有利於在零件之製造末期的清潔製 程。 軸頸軸承3之結構及設計使得所需的轴承器件整合至 轴頸軸承3内。另一方面，軸中心 件2被專屬地設計，使 :堇藉由轴中心件2、2,之交換，頂滾…在其生產及組 :期間適合頂滾輪攜載及配重臂之不同區段及/或鞍形物形 【圖式簡單說明】 圖1展示具有一短區段的管滾輪之示意性縱向剖視圖; 圖2展示具m段㈣滚輪之示意性縱向剖視圖； 圖3展示根據圖1的轴頸軸承之示意圖。 【主要元件符號說明】 1 :頂滾輪 1':頂滾輪 2 ·轴中心件 2 .轴中心件 201026916 3 :軸頸軸承 4 :軸承螺检 5 :孔 6 :滾動軸承/滚動體 7 :外環 7':外環 8 :密封唇 9 :蓋/蓋子 I 0 :中心部分 10’ ：中心部分 II :徑向凹座 12 :軌道 14 :軌道/罩 B :壓入深度 D :直徑 d :直徑 L :長度 51 :軸向伸展 52 :轴向伸展And the danger of debris sticking, and is conducive to the cleaning process at the end of the manufacturing of the parts. The structure and design of the journal bearing 3 allows the required bearing components to be integrated into the journal bearing 3. On the other hand, the shaft center member 2 is designed exclusively for the following: for the exchange of the shaft center members 2, 2, the top roller... during the production and assembly: suitable for the top roller carrying and the different regions of the weight arm BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 shows a schematic longitudinal cross-sectional view of a tube roller having a short section; Figure 2 shows a schematic longitudinal section through a m-section (four) roller; Figure 3 shows a diagram according to the figure Schematic diagram of the journal bearing of 1. [Main component symbol description] 1 : Top roller 1': Top roller 2 · Shaft center member 2. Shaft center member 201026916 3: Journal bearing 4: Bearing screw inspection 5: Hole 6: Rolling bearing / rolling element 7: Outer ring 7': outer ring 8: sealing lip 9: cover/lid I 0 : central portion 10': central portion II: radial recess 12: track 14: track/cover B: press-in depth D: diameter d: diameter L : Length 51: Axial extension 52: Axial extension