1325029 九、發明說明： . 【發明所屬之技術領域】 本發明涉及一種散熱風扇，尤指一種具有高潤滑特性 之散熱風扇及其定子絕緣片結構。 【先前技術】 隨著中央處理器等發熱電子元件之運行速度越 來越快，其產生之熱量亦愈來愈多。為確保電子元件 之正常運作，必須對其進行快速有效之散熱。通常， 業界在中央處理器等發熱電子元件上安裝散熱器輔 助其散熱，同時，在散熱器上安裝風扇，以提供強制 氣流促使散熱器之熱量快速散發，從而對中央處理器 等發熱電子元件進行更為有效之散熱。目前，散熱風 扇在電子元件散熱領域發揮著重要作用。風扇之良好 散熱效果使發熱元件具有較長之使用壽命，而風扇内 之軸承是否具有良好之潤滑性能又對風扇之使用壽 命產生重要影響。 風扇内之轴承一般採用潤滑油潤滑，習知風扇軸 承之保油效果一般不甚理想，隨著軸承内潤滑油之損 耗，風扇轉軸與軸承壁之摩擦會相應增加，從而降低 軸承之壽命，進而減少風扇本身之使用壽命。因此， 軸承之潤滑問題一直是散熱風扇領域關注之重點。 習知散熱風扇如圖7所示，其包括一轉子1，一具 有中柱5之扇框4，中柱5中心形成一通孔7，一軸承3 收容於該通孔7内。轴承3内形成一軸向之通孔，轉年由 6 2從轉子中央向下延伸，並收容於軸承3之通孔0，轉 轴2與軸承3之間填充潤滑油以旋轉地支持轉子1。一 油圈6環設於轉轴2並位於軸承3頂端，一狹槽（未標 不）形成於油圈6與中柱5之間。該散熱風扇工作時， /閏/骨油沿轉軸2攸升後會通過狹槽甩出流失（如圖中 虛線所示）。軸承3之潤滑性能也隨著潤滑油之流失而 逐漸降低，轉軸2和軸承3之間之摩擦增大。因潤滑不 足導致噪音變大，且轉軸2易磨損，而縮短風扇之使 用壽命。 另外，加設油圈6之方式導致在原散熱風扇之基 礎上需增加額外之元件，將增加材料以及製程成本， 同呀亦需增加組裝工序，在市場上缺乏成本競爭力。 【發明内容】 有鑒於此，在此實有必要提供一種防止潤滑油外泄 而具有更長之使用壽命，且幾乎不增加額外成本之散 熱風扇。 同日守亦有必要提供一種達成上述功效之定子絕 緣片結構。 種散熱風扇，包括一扇框、一轉子構件及一定 :構件’該扇框之底部中央突設形成-軸座，-内部 又有軸向通孔之軸承收容於軸座内，該轉子構件具有 收容於該軸承内部之通孔内之—轉軸，蚊子構縣 :於5亥轴座外緣’包括上、下絕緣片及夾設於上、下 絕緣片之間之多層石夕鋼片’該上絕緣片向轉轴所在中 1325029 心位置之内側一體延伸形成一擋油結構，該檔油結構 延伸至接近於轉軸之外表面。 一種定子絕緣片結構，該絕緣片包括一圓柱狀之 壁部，該壁部於底緣之圓周徑向向外均勻間隔延伸形 成多個延伸臂，該壁部於頂緣之圓周徑向向内一體延 伸形成一擋油結構。 與習知技術相比，該散熱風扇中擋油結構與定子構 件之絕緣片為一體成形，一方面可以防止潤滑油外 泄，另外一方面達到減免額外元件，從而節約材料以 及製程成本，簡化組裝工序。 【實施方式】 下面參照附圖，結合實施例對本發明作進一步說明。 請參閱圖1，該散熱風扇包括一扇框30、一軸承 系統60、一定子構件20及一轉子構件10，該轉子構件 10對應於該定子構件20之週邊，轉子構件10和定子構 件20分別收容於扇框30内。 扇框30包括一底部32和一轴座34，該轴座34從扇 框底部32中央向上突設形成。軸座34頂端為一開口頂 端，中央形成一收容空間36。該軸座34頂端之内圓周 處形成一環形凹陷38，該環形凹陷38與收容空間36相 連通。 定子構件20包括一電路板26、固定於電路板26上 之由複數層矽鋼片疊設形成之一電樞22及分別罩設 於電樞22上下兩端之上、下絕緣片28a、28b。電樞22 8 外部纏繞繞線24用以產生交替變化之磁場，並通過繞 線24與電路板26電性連接，絕緣片28a、識可避免電 樞22與繞線24電性接觸。 轉子構件ίο包括一輪轂12及一轉軸18，該輪轂12 外，放射狀突設複數扇葉14，輪轂12内側緣貼設一磁 鐵環16。該輪穀12中央形成-轉軸轴座120。該轉軸 18之頂端固定於該轉軸軸座12〇上，並向下延伸。 該軸承系統60包括一軸承61、一扣環63及一由高 才磨材料做成之襯整67，通過軸座34之開口頂端收容 於其收容空間3 6内。扣環6 3中央形成一中心通孔6 3 〇。 請參考圖2及圖3,為上絕緣片2心之立體放大圖及 alJ面圖，该上絕緣片28a包括一圓柱狀之壁部281，該 壁部281底緣之圓周徑向向外均勻間隔延伸形成四個 延伸臂282，以供繞線24纏繞；同時，該壁部281頂緣 之圓周彳空向向内一體延伸形成一擋油結構283，該擋 油結構283之中央形成一穿孔284。該擋油結構283包 括由壁部281之頂緣向内水平延伸一段距離形成之一 水平連接部283a、從該水平連接部283a之末端垂直向 下延伸一定高度形成之一豎直連接部283b及從該豎 直連接部283b之底端再向内水平延伸形成之一擋油 環283c °該豎直連接部283b之高度與軸座34頂端形成 環形凹陷38處之高度相等。該穿孔284設在擋油環283c 之中心處，以供轉轴Μ穿設延伸，該穿孔284之内徑 稱大於轉軸18之外徑。在此實施例中，轉軸μ與擋油 %283c之間形成一大約〇5mm之間隙。該風屬工作 時’此間隙就可以避免擋油環283c和轉軸18之間直接 接觸而產生摩擦。 清參照圖4與圖5，為散熱風扇之立體組裝圖及剖 視圊轴承系統收容於轴座34之收容空間36内，襯 塾67位於轴座34收容空間％之底部，軸座34之底端還 向内突出形成一台階31。該轉軸18之外表面於靠近其 頂端之位置處向内凹陷形成一環形之凹槽180，同 4 ’該轉轴18之外表面於靠近其底端之自由端186之 位置處向内凹陷形成另一環形之凹陷184。該扣環63 之中心通孔630之直徑大小可供轉軸18之自由端186 擦壓牙设通過’使扣環63套設於轉轴18之凹陷184 處’並位於軸承61之底端65與軸座34之台階31之間， 扣環63與凹陷184共同作用限制轉軸μ之軸向運動。 轉軸18穿設定子構件20之上絕緣片28a頂端之擋油結 構283 ’襯墊67與轉軸18之自由端186相抵觸，旋轉地 支持轉軸18 ’從而組裝轉子構件1〇。定子構件2〇套 設、固裝於軸座34外緣，且上絕緣片28a之擋油結構283 之水平連接部283a與軸座34之頂端相抵觸，豎直連接 部283b緊貼於開口頂端處之内壁，而擋油環283c可恰 好承載於軸座34開口頂端處之環形凹陷38内，且擋油 玉衣283c之内圓周接近於轉轴18之外表面。 請一併參閱圖6，軸承61内部形成一軸向通孔 62 ’以供轉轴18穿設延伸。軸承61内中間部分之内徑 10 1325029 大於頂端64和底端65部分之内徑，即軸向通孔中間 部分之直徑大於兩端部分之直徑，因而在軸承61中間 部分與轉軸18之間形成一空間70。該空間70内填充潤 滑油，一方面可以增加潤滑油之總容量，另一方面， 空間70使得軸承61僅兩末端64，65與轉軸18接觸，從 而減少了軸承61與轉軸18之間之接觸面積，從而減少 了兩者之間之摩擦，使得軸承61作用類似於兩個滾珠 軸承。軸承兩末端64、65與轉軸18之間形成一大約為 0.002~0.005mm之縫隙，並在兩末端64、65之外表面 於開口處分別形成圓弧倒角，從而減少風扇運轉時潤 滑油之漁漏，也便於軸承61裝設。 軸承61外表面形成有複數溝道68，與軸承61之軸 向通孔62相連通，以供潤滑油回流。任一溝道68包括 一呈弧線狀延伸之兩第一部分680以及位於軸承61之 外圓周表面66上之一第二部分682，該兩第一部分680 分別位於轴承兩末端64，65表面上。位於轴承61頂表 面640之第一部分680從通孔62向外圓周表面66沿風 扇之旋轉方向向外彎折延伸，本實施例中，風扇之旋 轉方向為逆時針方向，從而第一部分680向外彎折延 伸之方向也為逆時針方向。當風扇需要順時針方向旋 轉時，該第一部分680也可以沿時針方向向外彎折延 伸，以便引導外泄之潤滑油能通過溝道68回流。 該轴承61之頂端64比軸座34之開口頂端低，擋油 環283c與軸承61之頂端64間隔一定之間距，軸承61、 11 • 擋’由環283c與軸座34共同限定形成一儲油空間邛，該 儲'由空間50與軸承61之通孔62連通。轉軸18頂端之凹 ^ 18〇位於擔油環283c與軸承61之頂端64之間，並與儲 ;由空間50相連通。 該風扇工作時’定子構件20和轉子構件1〇磁場之 人互作用驅動轉子1〇旋轉。由於擋油環283c與轉軸18 之間幵> 成之間隙寬度足夠小，由於離心力作用沿轉軸 _ 18私濺出來之潤滑油，通過擋油環283c之阻擋，幾乎 玉。卩被聚集在儲油區5〇，而防止外泄，最後沿軸承61 上之溝道68回流至軸承61内，從而充分地防止了潤滑 油k軸承61洩漏，保證了軸承61與轉軸18之間良好之 之澗滑性能，減少磨損，降低噪音，提高了風扇之品 貝延長了風扇使用壽命。且擋油環283c與上絕緣片 28a體成型，不需要在原散熱風扇之基礎上增加額外 之几件，從而節約材料以及製程成本，並簡化組裝工 • 序。 综上所述，本發明符合發明專利要件，爰依法提出專 利申明。惟，以上所述者僅為本發明之較佳實施例，舉凡 ‘…^本案技蟄之人士，在爰依本發明精神所作之等效修飾 或變化，皆應涵蓋於以下之申請專利範圍内。 【圖式簡單說明】 圖1係本發明散熱風扇之立體分解示意圖。 圖2係圖1中上絕緣片之立體放大示意圖。 圖3係圖2沿冚-羾線之剖視圖。 12 1325029 圖4係圖1之一立體組合示意圖。 圖5係圖4沿V-V線之剖面示意圖。 圖6為圖1中散熱風扇軸承之放大示意圖。 圖7為習知散熱風扇示意圖。[Technical Field] The present invention relates to a heat dissipating fan, and more particularly to a heat dissipating fan having high lubricating properties and a stator insulating sheet structure thereof. [Prior Art] As heat-emitting electronic components such as a central processing unit operate faster and faster, more heat is generated. To ensure proper operation of electronic components, they must be dissipated quickly and efficiently. Generally, the industry installs a heat sink on a heat-generating electronic component such as a central processing unit to assist in heat dissipation, and at the same time, a fan is installed on the heat sink to provide a forced air flow to promote heat dissipation of the heat sink, thereby performing heat-emitting electronic components such as a central processing unit. More efficient heat dissipation. At present, the heat dissipation fan plays an important role in the field of heat dissipation of electronic components. The good heat dissipation effect of the fan makes the heating element have a long service life, and whether the bearing in the fan has good lubricating performance has an important influence on the service life of the fan. The bearings in the fan are generally lubricated with lubricating oil. The oil retaining effect of the conventional fan bearing is generally not ideal. As the lubricating oil in the bearing is worn, the friction between the fan shaft and the bearing wall will increase accordingly, thereby reducing the life of the bearing. Reduce the life of the fan itself. Therefore, the lubrication problem of bearings has always been the focus of the field of cooling fans. As shown in FIG. 7, the conventional heat dissipating fan includes a rotor 1, a fan frame 4 having a center pillar 5, and a center of the center pillar 5 forming a through hole 7, and a bearing 3 is received in the through hole 7. An axial through hole is formed in the bearing 3, and the rotation year is extended from the center of the rotor by 6 2 and is received in the through hole 0 of the bearing 3. The lubricating oil is filled between the rotating shaft 2 and the bearing 3 to rotatably support the rotor 1 . An oil ring 6 is disposed on the rotating shaft 2 at the top end of the bearing 3, and a slot (not labeled) is formed between the oil ring 6 and the center column 5. When the cooling fan is in operation, the /闰/bone oil will rise through the slot after being lifted up along the shaft 2 (as indicated by the dotted line in the figure). The lubricating property of the bearing 3 is also gradually lowered as the lubricating oil is lost, and the friction between the rotating shaft 2 and the bearing 3 is increased. The noise is increased due to insufficient lubrication, and the shaft 2 is easily worn, which shortens the service life of the fan. In addition, the addition of the oil ring 6 results in the need to add additional components on the basis of the original cooling fan, which will increase the material and process cost. It also requires an increase in the assembly process and lacks cost competitiveness in the market. SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a heat radiating fan which prevents leakage of lubricating oil and has a longer service life with little additional cost. It is also necessary to provide a stator insulation structure that achieves the above effects. The heat dissipating fan comprises a frame, a rotor member and a certain component: a member of the bottom of the fan frame protrudes from the center to form a shaft seat, and a bearing having an axial through hole therein is received in the shaft seat, and the rotor member has The shaft, which is housed in the through hole of the bearing, is located in the outer edge of the 5th shaft seat, including the upper and lower insulating sheets and the multi-layer Shishi steel sheet sandwiched between the upper and lower insulating sheets. The upper insulating sheet integrally extends toward the inner side of the 1325029 core position of the rotating shaft to form an oil retaining structure, and the oil retaining structure extends to be close to the outer surface of the rotating shaft. A stator insulating sheet structure, the insulating sheet comprising a cylindrical wall portion extending uniformly radially outwardly from a circumference of the bottom edge to form a plurality of extending arms, the wall portion being radially inward at a circumference of the top edge The integral extension forms an oil retaining structure. Compared with the prior art, the oil-dissipating structure of the heat-dissipating fan and the insulating sheet of the stator member are integrally formed, which can prevent leakage of lubricating oil on the one hand, and reduce additional components on the other hand, thereby saving material and process cost and simplifying assembly. Process. [Embodiment] Hereinafter, the present invention will be further described with reference to the accompanying drawings. Referring to FIG. 1 , the heat dissipation fan includes a frame 30 , a bearing system 60 , a stator member 20 , and a rotor member 10 . The rotor member 10 corresponds to the periphery of the stator member 20 , and the rotor member 10 and the stator member 20 respectively It is housed in the fan frame 30. The frame 30 includes a bottom portion 32 and a shaft seat 34 which is formed to project upwardly from the center of the bottom portion 32 of the frame. The top end of the shaft seat 34 is an open top end, and a receiving space 36 is formed in the center. An annular recess 38 is formed in the inner circumference of the top end of the shaft seat 34, and the annular recess 38 communicates with the receiving space 36. The stator member 20 includes a circuit board 26, an armature 22 formed by stacking a plurality of layers of silicon steel sheets fixed to the circuit board 26, and upper and lower ends of the armature 22, and lower insulating sheets 28a and 28b, respectively. The armature 22 8 is externally wound around the wire 24 for generating an alternating magnetic field and electrically connected to the circuit board 26 via the winding 24. The insulating sheet 28a prevents the armature 22 from being in electrical contact with the winding 24. The rotor member ίο includes a hub 12 and a rotating shaft 18. Outside the hub 12, a plurality of blades 14 are radially protruded, and a magnet ring 16 is attached to the inner edge of the hub 12. The center of the volute 12 forms a pivot shaft seat 120. The top end of the rotating shaft 18 is fixed to the rotating shaft seat 12 , and extends downward. The bearing system 60 includes a bearing 61, a retaining ring 63, and a lining 67 made of a high-grinding material, which is received in the accommodating space 36 by the open top end of the shaft seat 34. A central through hole 6 3 形成 is formed in the center of the buckle 6 3 . Referring to FIG. 2 and FIG. 3, a perspective view of the core of the upper insulating sheet 2 and an aJ surface view thereof, the upper insulating sheet 28a includes a cylindrical wall portion 281, and the circumference of the bottom edge of the wall portion 281 is radially outward and uniform. Four extension arms 282 are formed at intervals to wrap the windings 24; at the same time, the circumferential edge of the top edge of the wall portion 281 integrally extends inwardly to form an oil retaining structure 283, and a center of the oil retaining structure 283 forms a perforation. 284. The oil retaining structure 283 includes a horizontal connecting portion 283a extending horizontally inwardly from a top edge of the wall portion 281, and a vertical connecting portion 283b formed vertically from a distal end of the horizontal connecting portion 283a. An oil retaining ring 283c is formed horizontally from the bottom end of the vertical connecting portion 283b. The height of the vertical connecting portion 283b is equal to the height at which the tip end of the shaft seat 34 forms an annular recess 38. The through hole 284 is provided at the center of the slinger 283c for extending through the shaft, and the inner diameter of the hole 284 is larger than the outer diameter of the shaft 18. In this embodiment, a gap of about 5 mm is formed between the rotating shaft μ and the oil retaining member 283c. When the wind is in operation, the gap can avoid direct contact between the oil retaining ring 283c and the rotating shaft 18 to generate friction. Referring to FIG. 4 and FIG. 5, the three-dimensional assembly diagram of the cooling fan and the cross-sectional 圊 bearing system are housed in the accommodating space 36 of the shaft seat 34. The lining 67 is located at the bottom of the housing space of the shaft seat 34, and the bottom of the shaft seat 34 The end also protrudes inward to form a step 31. The outer surface of the rotating shaft 18 is recessed inwardly at a position near the top end thereof to form an annular groove 180, and the outer surface of the rotating shaft 18 is recessed inwardly at a position close to the free end 186 of the bottom end thereof. Another annular recess 184. The diameter of the central through hole 630 of the retaining ring 63 is sized for the free end 186 of the rotating shaft 18 to be squeezed through the 'depression 63 to the recess 184' of the rotating shaft 18 and located at the bottom end 65 of the bearing 61. Between the steps 31 of the shaft seat 34, the buckle 63 and the recess 184 cooperate to limit the axial movement of the shaft μ. The rotating shaft 18 passes through the oil retaining structure 283' at the top end of the insulating sheet 28a on the setting sub-member 20. The spacer 67 is in contact with the free end 186 of the rotating shaft 18, and rotatably supports the rotating shaft 18' to assemble the rotor member 1''. The stator member 2 is sleeved and fixed to the outer edge of the shaft seat 34, and the horizontal connecting portion 283a of the oil retaining structure 283 of the upper insulating sheet 28a is in contact with the top end of the shaft seat 34, and the vertical connecting portion 283b is in close contact with the top end of the opening. The inner wall of the oil retaining ring 283c can be carried in the annular recess 38 at the top end of the open end of the shaft seat 34, and the inner circumference of the oil retaining 693c is close to the outer surface of the rotating shaft 18. Referring to Figure 6, an axial through hole 62' is formed in the bearing 61 for the shaft 18 to extend. The inner diameter 10 1325029 of the middle portion of the bearing 61 is larger than the inner diameter of the portion of the top end 64 and the bottom end 65, that is, the diameter of the intermediate portion of the axial through hole is larger than the diameter of the end portions, and thus forms between the intermediate portion of the bearing 61 and the rotating shaft 18. A space 70. The space 70 is filled with lubricating oil, on the one hand, the total capacity of the lubricating oil can be increased. On the other hand, the space 70 causes the bearing 61 to contact only the two ends 64, 65 with the rotating shaft 18, thereby reducing the contact between the bearing 61 and the rotating shaft 18. The area, which reduces the friction between the two, makes the bearing 61 act like two ball bearings. A gap of about 0.002~0.005mm is formed between the two ends 64, 65 of the bearing and the rotating shaft 18, and a circular chamfer is formed on the outer surface of the two ends 64 and 65 at the opening, thereby reducing the lubricating oil during the operation of the fan. The fishing leak also facilitates the installation of the bearing 61. A plurality of grooves 68 are formed on the outer surface of the bearing 61 to communicate with the axial through holes 62 of the bearing 61 for the lubricating oil to recirculate. Either of the channels 68 includes a first portion 680 extending in an arcuate shape and a second portion 682 on the outer circumferential surface 66 of the bearing 61, the first portions 680 being located on the surfaces of the ends 64, 65 of the bearing, respectively. The first portion 680 of the top surface 640 of the bearing 61 extends outwardly from the through hole 62 to the outer circumferential surface 66 in the direction of rotation of the fan. In this embodiment, the direction of rotation of the fan is counterclockwise, so that the first portion 680 is outward. The direction in which the bend extends is also counterclockwise. When the fan needs to rotate clockwise, the first portion 680 can also be bent outwardly in the clockwise direction to direct the leaking lubricating oil back through the channel 68. The top end 64 of the bearing 61 is lower than the open top end of the shaft seat 34, and the oil slinger 283c is spaced apart from the top end 64 of the bearing 61 by a certain distance. The bearings 61, 11 and the 'stop' are jointly defined by the ring 283c and the shaft seat 34 to form an oil reservoir. The space 邛, the reservoir ' communicates with the through hole 62 of the bearing 61 from the space 50. The concave portion 18 of the top end of the rotating shaft 18 is located between the oil bearing ring 283c and the top end 64 of the bearing 61, and is connected to the space 50. When the fan is in operation, the interaction of the stator member 20 and the rotor member 1 with the magnetic field drives the rotor 1 to rotate. Since the gap between the oil retaining ring 283c and the rotating shaft 18 is sufficiently small, the lubricating oil splashed along the rotating shaft _ 18 due to the centrifugal force is blocked by the oil retaining ring 283c, and is almost jade. The crucible is collected in the oil storage area 5〇, and is prevented from leaking, and finally flows back into the bearing 61 along the channel 68 on the bearing 61, thereby sufficiently preventing leakage of the lubricating oil k bearing 61, ensuring the bearing 61 and the rotating shaft 18 The good sliding performance, reducing wear and tear, reducing noise, and improving the fan's product extend the life of the fan. Moreover, the oil retaining ring 283c and the upper insulating sheet 28a are formed, and it is not necessary to add an extra number of parts to the original cooling fan, thereby saving materials and process costs, and simplifying the assembly process. In summary, the present invention complies with the requirements of the invention patent, and proposes a patent declaration according to law. However, the above description is only a preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art of the present invention should be included in the following claims. . BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective exploded view of a cooling fan of the present invention. 2 is a perspective enlarged view of the upper insulating sheet of FIG. 1. Figure 3 is a cross-sectional view of Figure 2 taken along the 冚-羾 line. 12 1325029 FIG. 4 is a schematic perspective view of one of FIG. Figure 5 is a schematic cross-sectional view taken along line V-V of Figure 4. Figure 6 is an enlarged schematic view of the heat sink fan bearing of Figure 1. Figure 7 is a schematic view of a conventional cooling fan.
【本發明主要元件符號說明】 轉子構件 10 輪毅 12 轉轴轴座 120 扇葉 14 磁鐵環 16 轉轴 18 凹槽 180 凹陷 184 自由端 186 定子構件 20 電枢 22 繞線 24 電路板 26 上絕緣片 28a 下絕緣片 28b 壁部 281 延伸臂 282 擋油結構 283 水平連接部 283a 豎直連接部 283b 擋油環 283c 穿孔 284 扇框 30 台階 31 底部 32 軸座 34 收容空間 36 環形凹陷 38 儲油空間 50 軸承系統 60 軸承 61 通孔 62 扣環 63 中心通孔 630 頂端 64 頂表面 640 底端 65 外圓周表面 66 第一部分 680 第二部分 682 空間 70 【先前技術元件符號說明】 轉子 1 轉軸 2 轴承 3 扇框 4 中柱 5 油圈 6 13 1325029 通孔 Ί[Description of the main components of the present invention] Rotor member 10 Wheel 12 Tire shaft housing 120 Fan blade 14 Magnet ring 16 Rotary shaft 18 Groove 180 Sag 184 Free end 186 Stator member 20 Armature 22 Winding 24 Circuit board 26 Upper insulation Sheet 28a Lower insulating sheet 28b Wall portion 281 Extension arm 282 Oil retaining structure 283 Horizontal connecting portion 283a Vertical connecting portion 283b Oil retaining ring 283c Perforation 284 Sector frame 30 Step 31 Bottom 32 Shaft seat 34 Housing space 36 Annular recess 38 Oil storage space 50 bearing system 60 bearing 61 through hole 62 retaining ring 63 center through hole 630 top 64 top surface 640 bottom end 65 outer circumferential surface 66 first part 680 second part 682 space 70 [previous element symbol description] rotor 1 shaft 2 bearing 3 Fan frame 4 center column 5 oil ring 6 13 1325029 through hole
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