1226144 (1) 玖、發明說明 【發明所屬之技術領域】 本發明是關於一種具有支持與轉子鐵心另外體所構成 的旋轉軸所需的軸支持體的電動機的轉子。 【先前技術】 例如在外轉型永久磁鐵電動機的轉子，有表示於日本 專利第3 0 1 7 9 5 3號公報者。亦即，如第3圖及第4圖所示地 ’轉子1是由具有：圓板狀主板部2及設在上述主板部2的 外周緣部的環狀壁3所構成的磁性體製的機極4，沿著上述 環狀壁3的內周面而被環狀配置的多數個轉子磁鐵5，爲了 確保上述轉子磁鐵5的磁路而配置在上述環狀壁3的外周部 的磁性體製的環構件6，配置在上述主板部2的中心部的軸 支持體7所構成。 上述機框4是藉由壓力加工磁性體所形成。與轉子磁 鐵5，環構件6，軸支持體7—起藉由樹脂8被一體化。 上述軸支持體7是具有朝軸方向延伸的嵌合孔9。在上 述嵌合孔9，形成能嵌入未圖示的旋轉軸，而在其內周面 形成有朝軸方向延伸的多數齒所構成的鋸齒1 〇。由以上， 旋轉軸是形成對於嵌合孔9以停止旋轉狀態被嵌合。 如此地上述支持體7是支持旋轉軸的零件’可以提高 轉子1的旋轉精度之故，因而在該嵌合孔9或外周形狀等上 被要求較高的尺寸精度。這時候’將上述軸支持體7作成 加工性優異的樹脂成形品，則可得到尺寸精度較高者，惟 -6- (2) 1226144 有機械性強度較弱的缺點。1226144 (1) (ii) Description of the invention [Technical field to which the invention belongs] The present invention relates to a rotor of a motor having a shaft supporting body required to support a rotating shaft constituted by a separate body from a rotor core. [Prior Art] For example, a rotor of a permanent magnet motor transformed outside is disclosed in Japanese Patent No. 3,017,953. That is, as shown in FIGS. 3 and 4, the rotor 1 is a machine having a magnetic system including a disk-shaped main plate portion 2 and an annular wall 3 provided on an outer peripheral portion of the main plate portion 2. The poles 4 are a plurality of rotor magnets 5 that are arranged annularly along the inner peripheral surface of the annular wall 3. The magnetic system is arranged on the outer periphery of the annular wall 3 in order to ensure the magnetic circuit of the rotor magnet 5. The ring member 6 is constituted by a shaft support 7 arranged at the center portion of the main plate portion 2. The frame 4 is formed by pressing a magnetic body. It is integrated with the rotor magnet 5, the ring member 6, and the shaft support 7 by resin 8. The shaft support body 7 has a fitting hole 9 extending in the axial direction. The above-mentioned fitting hole 9 is formed with a saw shaft 10 that can be fitted into a rotation shaft (not shown), and a plurality of teeth extending in the axial direction are formed on the inner peripheral surface thereof. From the above, the rotation shaft is fitted to the fitting hole 9 in a stopped rotation state. As described above, the support body 7 is a member that supports a rotating shaft, and since the rotation accuracy of the rotor 1 can be improved, a high dimensional accuracy is required in the fitting hole 9 or the outer peripheral shape. At this time ', if the above-mentioned shaft support 7 is made into a resin-molded article having excellent workability, one having high dimensional accuracy can be obtained, but -6- (2) 1226144 has the disadvantage of weak mechanical strength.
如此，習知的軸支持體7，是藉由機械性強度較強的 鍛造，特別是藉由冷鍛造所構成。但是，冷鍛造是爲了得 到目的的工件形狀而必須重複進行沖壓加工，又金屬模本 體的設計較難。又，沖壓成形後的工件，是爲了確保其尺 寸精度而必須進行精密加工，熱處理（退火），硏磨加工。 所以，有加工性不好且製造成本較高的缺點。又，冷鍛造 品是也有較難確保精度，確保品質的缺點。 【發明內容】 本發明是鑑於上述事項而創作者，其目的是在於提供 一種具有容易確保高尺寸精度且加工性優異的軸支持體的 電動機的轉子。As described above, the conventional shaft support 7 is formed by forging with strong mechanical strength, and is particularly formed by cold forging. However, cold forging is necessary to repeatedly perform stamping in order to obtain the desired workpiece shape, and the design of the mold body is difficult. In addition, in order to ensure the dimensional accuracy of the workpiece after press forming, precision machining, heat treatment (annealing), and honing must be performed. Therefore, there are disadvantages that the workability is not good and the manufacturing cost is high. In addition, cold forged products have disadvantages that it is difficult to ensure accuracy and quality. SUMMARY OF THE INVENTION The present invention has been made in view of the foregoing matters, and an object of the present invention is to provide a rotor for a motor having a shaft support that is easy to ensure high dimensional accuracy and excellent in workability.
本發明的申請專利範圍第1項的電動機的轉子，屬於 具有轉子鐵心的旋轉體，及具有配置於設在上述旋轉體的 中心部的孔部，且嵌合支持旋轉軸所需的軸支持體的電動 機的轉子，其特徵爲：上述軸支持體是藉由朝軸方向疊層 多數金屬所構成。 這時候’旋轉體是由配置於定子的外周的轉子鐵心及 支持上述轉子鐵心的機框所構成；上述軸支持體是配置在 設於上述機框的中央部的孔部較理想。 金屬板的加工是與冷鍛造相比較工序較少，且精度優 異。因此，依照上述構成，可得到具備加工性，尺寸精度優 異的軸支持體的電動機的轉子。 -7- (3) 1226144 本發明的申請專利範圍第3項的電動機的轉子，是具有 藉由歛縫互相地接合被疊層的金屬板’爲其特徵者。這時候 ，藉由歛縫的接合，是針對被疊層的整體金屬板進行較理想 (申請專利範圍第4項的發明）。 依照上述構成，可容易地固定被疊層的金屬板，而可 提高軸支持體的強度。 又，爲了提高旋轉軸的滑動性，防止生銹，在軸支持 體中至少與旋轉軸的接觸面施以表面處理也可以（申請專利 範圍第5項的發明）。 金屬板是電磁鋼板所構成也可以的構成（申請專利範 圍第6項的發明）。電磁鋼板是板厚度偏差較少之故，因而 容易確保尺寸精度。又，事先施以事先表面塗佈之故，因 而可省略切斷面以外部分的表面處理。 本發明的申請專利範圍第7項的電動機的轉子，軸支持 體與機框是藉由樹脂一體成形，爲其特徵者。依照上述構成 ，可將軸支持體確實地固定在機框。 這時候，在上述軸支持體的外周面設置軸方向的階段 差就可以（申請專利範圍第8項的發明）。依照上述構成，可 防止從軸支持體與機框之樹脂成形品脫落上述軸支持體。 又，爲了防止軸支持體與機框之樹脂成形品的上述軸 支持體的旋轉，在上述軸支持體設置與軸方向正交的剖面形 狀成爲非圓形的部分也可以的構成（申請專利範圍第9項的發 (4) 1226144 【實施方式】 以下，一面參照第1圖及第2圖一面說明本發明的一實 施例。本實施例的轉子，是表示於第3圖及第4圖的先前的 轉子中僅軸支持體的構成不相同，而其他部分是具有同樣 的構成。因此，在這裏，轉子中僅說明軸支持體的構成， 而對於其他部分則省略其說明。 又，表示於第3圖及第4圖的轉子1中的機框4的環狀壁 3，環構件6是相當於本發明的轉子鐵心。又，機框4，轉 子磁鐵5，環構件6是相當於本發明的旋轉體。 第1圖是表不軸支持體1 1的俯視圖；第2圖是表不沿著 第1圖中X- X線的軸支持體1 1的縱剖視圖。如此些第1圖及 第2圖所示地，軸支持體1 1是由外周形狀爲圓形狀的上部 1 1 a及下部1 1 b，與外周形狀由非圓板形狀，例如十二角形 狀的中間部1 1 c所構成。 上述軸支持體1 1的上部η a及下部1 1 b的外徑尺寸是設 成大約相同，而中間部1 1 c的最小外徑尺寸是設成大於上 述上部及下部的外徑尺寸。所以，在軸支持體1 1的外周中 的中間部1 lc與上部1 la及下部1 lb之境界部分分別形成有 階段差1 1 d，1 1 e。 在軸支持體1 1的內部，設有朝軸方向貫通的嵌合孔1 2 。在上述嵌合孔1 2成爲嵌入有未圖示的旋轉軸的狀態。上 述嵌合孔1 2中位於軸支持體1 1的下部1 1 b及中間部1 1 c的下 部的部分是構成徑大，而其他部分是構成徑小，而在該徑 小；在該徑小部分設有從朝軸方向延伸的多數齒部1 3 &所 -9- (5) 1226144 構成的鋸齒1 3。 上述軸支持體Π是由疊層例如電磁鋼板的多數所定形 狀的金屬板所構成，同時在嵌合孔1 2內面施以鋁蒸鍍處理 所構成。鋁蒸鍍處理是爲了防止成爲電磁鋼板的切斷面的 嵌合孔1 2內面的生銹及提高滑動性而進行。 又，被疊層的所有電磁鋼板是藉由歛縫互相地被接合 。在本實施例中，對於位於最下部的電磁鋼板設有四處凹 部所構成的歛縫部1 4，而對於其他的電磁鋼板設有四處切 起所形成的凸部及凹部所構成的歛縫部1 4。四個歛縫部是 放射狀地均等配置。 如上所述地，上述軸支持體U是與機框4，轉子磁鐵5 ，環構件6—起藉由樹脂8被一體化（參照第3圖）。因此， 軸支持體1 1的切剖面而未施以鋁蒸鍍處理的外周面是被埋 設在樹脂8的內部。又，藉由樹脂8將軸支持體1 1與機框4 成爲一體化，可將軸支持體1 1確實地固定於機框4。 以下，簡述軸支持體1 1的製造方法。首先，以順送模 且從原材料沖切對應於軸支持體1 1的下部1 1 b的圓環狀電 磁鋼板，而重複位置設定在所定模具的順送壓力加工所定 次數（第1工序）。之後，以順送模具從原材料沖切對應於 中間部1 1 c的環狀電磁鋼板，而重複設定在以第1工序所疊 層的電磁鋼板上的順送壓力加工所定次數（第2工序）。然 後’以順送模具從原材料沖切對應於上部1 1 a的外周形狀 的圓形狀電磁鋼板，而重複設定在以第2工序所疊層的電 磁鋼板上的順送壓力加工所定次數（第3工序）。 -10- (6) 1226144 又，在順送壓力加工中，在各電磁鋼板的所定部位形 成有欽縫部1 4。又，各電磁鋼板是設定在模具內使得上述 歛縫部1 4成爲相同位置。由此，被設定在模具的電磁鋼板 的凸部，是在進入在鄰接於下部的電磁鋼板的凹部的狀態 下被疊層。 藉由第1至第3工序疊層有構成下層lib，中間部11c， 上部1 1 a的所有電磁鋼板，最後，藉由歛縫壓力加工接合 有鄰接的電磁鋼板。又，藉由在嵌合孔1 2的內面施以鋁蒸 鍍處理，以完成軸支持體1 1。 如此地，本實施例是從疊層鋼板構成轉子1的軸支持 體1 1之故，因而與習知的軸支持體7相比較，以短且簡單 的工序可加以製造，而可得到刪減製造成本。又藉由壓力加 工所形成的各電磁鋼板是精度優異又高品質之故，因而可充 分地確保上述軸支持體1 1的品質及嵌合孔1 2的尺寸精度。 在本實施例中，藉由歛縫互相地接合所有疊層鋼板之 故，因而可提高軸支持體11的強度。這時候，藉由切起各電 磁鋼板的一部分而構成歛縫部14。因此，與使用鉚釘等的接 合構件來接合電磁鋼板的構成相比較可作成簡單且廉價的構 成。 而且，針對於各電磁鋼板分別設置等間隔地配置的四 個歛縫部14之故，因而能平衡優異地接合電磁鋼板。又，可 防止各電磁鋼板的周方向的偏立，而可更提高強度。 又，藉由疊層板厚度偏小的電磁鋼板而構成軸支持體 11之故，因而可更提高軸支持體11的尺寸精度。又，電磁鋼 -11 - (7) (7)1226144 板是事先施以表面處理之故，因而可省略不是切斷面的軸支 持體11的上面及下面的表面處理。 然而，電磁鋼板是作爲電動機的轉子鐵心一般所使用 的材料。因此，將上述構成的軸支持體1 1，適用在具有疊層 的電磁鋼板所構成的轉子鐵心的外轉型電動機時，則可共取 轉子鐵心與軸支持體11，而可提高材料採用效率。 又，在本實施例中，軸支持體11是藉由樹脂與機框4一 體成形。這時候，在軸支持體11的外周面設有階段差11 d， 1 1 e，同時將中間部11 c的外周面作成非圓形狀之故，因而可 防止軸支持體11從樹脂成形品脫落或朝周方向轉動。 又，本發明是並不被限定於上述且表示於圖式的實施 例者，例如可作如下的變形或擴張。 軸支持體的表面處理是除了鋁蒸鍍處理之外，也可施 以鍍鋅處理，塗裝聚四氟乙烯。藉由此些處理，也可防止生 銹，提高滑動性。 設在各電磁鋼板的歛縫部是一至三處均可以，又五處 以上也可以。又，並不被限定在電磁鋼板，藉由疊層鐵板來 構成軸支持體也可以。 軸支持體的中間部的外周形狀並不被限定在十二方形 ，而是非圓形狀也可以。又，將軸支持體的上部或下部作成 非圓形狀也可以。本發明是也可適用於內轉型電動機的轉子 (發明的效果） -12- (8) 1226144 由以上說明可知，本發明是配置在設於具有轉子鐵心、 的旋轉體的中心部的孔部，而用以嵌合支持旋轉軸的軸支 持體，藉由朝軸方向疊層多數金屬板所構成之故，因而與 胃知的軸支持體相比較，可提高加工性，同時可充分地確 保尺寸精度，機械性強度。 【圖式簡單說明】The rotor of the electric motor according to the first patent application scope of the present invention belongs to a rotating body having a rotor core, and a shaft support provided at a central portion of the rotating body and fitted with a shaft support required to support a rotating shaft. The rotor of the electric motor is characterized in that the shaft support is formed by laminating a large number of metals in the axial direction. In this case, the 'rotating body' is composed of a rotor core arranged on the outer periphery of the stator and a frame supporting the rotor core; the shaft support is preferably a hole portion provided in a central portion of the frame. Compared with cold forging, the processing of metal plates has fewer steps and excellent accuracy. Therefore, according to the above configuration, it is possible to obtain a rotor of a motor having a shaft support having excellent workability and excellent dimensional accuracy. -7- (3) 1226144 The rotor of the electric motor according to item 3 of the scope of patent application of the present invention is characterized in that the laminated metal plates are joined to each other by caulking. At this time, the caulking joint is ideal for the laminated metal plates (the fourth invention in the scope of patent application). According to the above configuration, the laminated metal plates can be easily fixed, and the strength of the shaft support can be improved. In addition, in order to improve the slidability of the rotating shaft and prevent rust, at least the contact surface of the shaft support with the rotating shaft may be subjected to a surface treatment (invention No. 5 in the scope of patent application). The metal plate may be constituted by an electromagnetic steel plate (invention under the scope of patent application No. 6). The electromagnetic steel sheet has less variation in the thickness of the plate, so it is easy to ensure dimensional accuracy. In addition, since surface coating is performed in advance, the surface treatment of parts other than the cut surface can be omitted. The rotor of the electric motor according to claim 7 of the present invention is characterized in that the shaft support and the frame are integrally formed of resin. According to the above structure, the shaft support body can be reliably fixed to the frame. In this case, it is sufficient to provide a step in the axial direction on the outer peripheral surface of the above-mentioned shaft support (invention No. 8 in the scope of patent application). According to the above configuration, the shaft support can be prevented from falling off from the resin molded product of the shaft support and the frame. In addition, in order to prevent rotation of the shaft support and the shaft support of the resin molded product of the frame, the shaft support may have a configuration in which a non-circular cross-sectional shape perpendicular to the axial direction is provided (patent application scope) Issue of Item 9 (4) 1226144 [Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to Figs. 1 and 2. The rotor of this embodiment is shown in Figs. 3 and 4 In the conventional rotor, only the structure of the shaft support is different, and the other parts have the same structure. Therefore, here, only the structure of the shaft support is described in the rotor, and the description of the other parts is omitted. The ring-shaped wall 3 and the ring member 6 of the frame 4 in the rotor 1 of FIGS. 3 and 4 correspond to the rotor core of the present invention. The frame 4, the rotor magnet 5, and the ring member 6 correspond to the present invention. The rotating body of the invention. Fig. 1 is a plan view showing the shaft support body 11; Fig. 2 is a longitudinal sectional view showing the shaft support body 11 along the X-X line in Fig. 1. Such first views As shown in FIG. 2, the shaft support 11 is rounded from the outer shape. The upper part 1 1 a and the lower part 1 1 b of the shape and the outer peripheral shape are formed of a non-circular plate shape, for example, a middle part 1 1 c of a dodecagonal shape. The upper part η a and the lower part 1 1 b of the shaft support 11 1 The outer diameter dimension of the shaft support is set to be approximately the same, and the minimum outer diameter dimension of the middle portion 1 1 c is set to be larger than the outer diameter dimensions of the upper and lower portions. Therefore, the middle portion 1 lc in the outer periphery of the shaft support 11 Steps 1 1 d and 1 1 e are formed on the boundary portions of the upper part 1 la and the lower part 1 lb. Fitting holes 1 2 are formed in the shaft support body 1 and penetrate in the axial direction. The hole 12 is in a state in which a rotation shaft (not shown) is fitted. Of the fitting holes 12, the lower portion 1 1 b and the lower portion 1 1 c of the shaft support body 1 1 have a large diameter, and other The part is composed of a small diameter, and the diameter is small; a small portion of the diameter is provided with a plurality of tooth portions 1 3 & 9-9 (5) 1226144 composed of the axial direction. The above-mentioned shaft support Π is formed by laminating a plurality of metal plates of a predetermined shape, such as an electromagnetic steel plate, and applying aluminum vapor deposition to the inner surface of the fitting hole 12 The aluminum vapor deposition treatment is performed to prevent rust on the inner surface of the fitting hole 12 which is the cut surface of the electromagnetic steel sheet and to improve the sliding property. Furthermore, all the electromagnetic steel sheets to be laminated are crimped. In this embodiment, a caulking portion 14 formed by four recesses is provided for the electromagnetic steel plate at the lowermost portion, and a convex portion and a recessed portion formed by cutting up at four locations are provided for other electromagnetic steel plates. The caulking portions 1 and 4. The four caulking portions are evenly arranged radially. As described above, the shaft support U is integrated with the machine frame 4, the rotor magnet 5, and the ring member 6 through resin 8 ( (See Figure 3). Therefore, the outer peripheral surface of the cross-section of the shaft support 11 without being subjected to the aluminum vapor deposition treatment is buried in the resin 8. In addition, the shaft support 11 and the machine frame 4 are integrated by the resin 8, and the shaft support 11 can be reliably fixed to the machine frame 4. Hereinafter, a method for manufacturing the shaft support body 11 will be briefly described. First, a ring-shaped electromagnetic steel sheet corresponding to the lower portion 1 1 b of the shaft support 11 is punched from the raw material by a progressive die, and the repeating position is set at a predetermined number of times by the forward pressure of a predetermined mold (first step). After that, the annular electromagnetic steel sheet corresponding to the intermediate portion 1 1 c is blanked from the raw material with a progressive die, and repeatedly set a predetermined number of times by the progressive pressure processing on the electromagnetic steel sheet laminated in the first step (second step). . Then, a circular-shaped electromagnetic steel sheet corresponding to the outer shape of the upper part 1 1 a is punched out from the raw material with a progressive die, and the number of forward-pressure processing set on the electromagnetic steel sheet laminated in the second step is repeatedly set (the third Operation). -10- (6) 1226144 In the forward pressure processing, a caulking portion 14 is formed at a predetermined portion of each electromagnetic steel plate. Each electromagnetic steel sheet is set in a mold such that the caulked portions 14 are at the same position. Accordingly, the convex portions of the electromagnetic steel sheet set in the mold are laminated in a state where they enter into the concave portions adjacent to the lower electromagnetic steel sheet. In the first to third steps, all the electromagnetic steel plates constituting the lower layer lib, the middle portion 11c, and the upper portion 1a are laminated, and finally, adjacent electromagnetic steel plates are joined by caulking pressure processing. Further, the inner surface of the fitting hole 12 is subjected to an aluminum vapor deposition treatment to complete the shaft support 11. In this way, the present embodiment is composed of a laminated steel plate and the shaft support 11 of the rotor 1. Therefore, compared with the conventional shaft support 7, it can be manufactured in a short and simple process, and can be deleted. manufacturing cost. In addition, each electromagnetic steel sheet formed by press working is excellent in accuracy and high quality, and thus the quality of the shaft support 11 and the dimensional accuracy of the fitting hole 12 can be sufficiently ensured. In this embodiment, since all the laminated steel plates are joined to each other by caulking, the strength of the shaft support 11 can be increased. At this time, the caulked portion 14 is formed by cutting up a part of each electromagnetic steel sheet. Therefore, it is possible to make the structure simpler and cheaper than the structure in which the electromagnetic steel sheet is joined using a joining member such as a rivet. In addition, the four caulking portions 14 arranged at regular intervals are provided for each electromagnetic steel plate, so that the electromagnetic steel plate can be joined with excellent balance. In addition, it is possible to prevent the circumferential direction of each electromagnetic steel sheet from being deviated, and to further increase the strength. Further, since the shaft support 11 is constituted by an electromagnetic steel sheet having a small laminated plate thickness, the dimensional accuracy of the shaft support 11 can be further improved. In addition, since the electromagnetic steel -11-(7) (7) 1226144 is surface-treated in advance, the surface treatment of the upper and lower surfaces of the shaft support 11 which is not a cut surface can be omitted. However, the electromagnetic steel sheet is generally used as a rotor core of a motor. Therefore, when the shaft support 11 having the above-mentioned structure is applied to an external transformation motor having a rotor core composed of laminated electromagnetic steel plates, the rotor core and the shaft support 11 can be taken together, thereby improving material utilization efficiency. In this embodiment, the shaft support 11 is formed integrally with the frame 4 by resin. At this time, the outer peripheral surface of the shaft support 11 is provided with step differences 11 d, 1 1 e, and the outer peripheral surface of the intermediate portion 11 c is formed into a non-circular shape, so that the shaft support 11 can be prevented from falling out of the resin molded product. Or turn in the circumferential direction. The present invention is not limited to the embodiment described above and shown in the drawings, and may be modified or expanded as follows, for example. The surface treatment of the shaft support is not only an aluminum vapor deposition treatment, but also a galvanization treatment and coating with polytetrafluoroethylene. With these treatments, rust can be prevented and sliding properties can be improved. The caulking portion provided in each electromagnetic steel plate may be one to three, and five or more may be provided. The shaft support is not limited to an electromagnetic steel plate, and a laminated iron plate may be used. The outer peripheral shape of the middle portion of the shaft support is not limited to a twelve square shape, but a non-circular shape may be used. The upper or lower portion of the shaft support may be formed in a non-circular shape. The present invention is also applicable to a rotor of an internal transformation motor (effect of the invention). -12- (8) 1226144 As can be seen from the above description, the present invention is a hole portion provided in a center portion of a rotating body having a rotor core The shaft support used to fit and support the rotating shaft is constructed by laminating a large number of metal plates in the axial direction. Compared with the known shaft support, it can improve workability and ensure sufficient size. Precision, mechanical strength. [Schematic description]
第1圖是表示本發明的一實施例的軸支持體的俯視圖。 第2圖是表示軸支持體的縱剖視圖。 第3圖是表示習知的電動機的轉子的立體圖。 第4圖是表示習知的電動機的轉子的縱剖視圖。 主要元件對照表 1 ·_轉子 3 ·環狀壁（轉子鐵心）FIG. 1 is a plan view showing a shaft support according to an embodiment of the present invention. Fig. 2 is a longitudinal sectional view showing a shaft support. FIG. 3 is a perspective view showing a rotor of a conventional motor. Fig. 4 is a longitudinal sectional view showing a rotor of a conventional motor. Comparison table of main components 1 · _Rotor 3 · Annular wall (rotor core)
4:機械（旋轉體） 5:轉子磁鐵（旋轉體） 6：環構件（轉子鐵心，旋轉體） 8:樹脂 1 1 :軸支持體 1 1 d，1 1 e :階段差 1 4 :歛縫部 •13-4: Machine (rotating body) 5: Rotor magnet (rotating body) 6: Ring member (rotor core, rotating body) 8: Resin 1 1: Shaft support 1 1 d, 1 1 e: Step difference 1 4: Caulking section • 13-