M428893 五、新型說明： 【新型所屬之技術領域】 本新型是關於自行車用輪轂，尤其是構成自行車的車 輪的輪轂的內建馬達之自行車用輪轂。 【先前技術】 習知的自行車’有藉由馬達來輔助人力所達成的驅動 力之電動輔助自fr車。在電動輔助自行車，設置有：內建 馬達之自行車用輪轂。習知的內建馬達之自行車用輪轂， 是以左右一對的滾動軸承來支承轉子（例如，參考專利文 獻1 )。 [先前技術文獻] [專利文獻] [專利文獻1]日本特開2005-3 3 5536號公報 【新型內容】 [新型欲解決的課題] 例如考慮組裝性，在需要以鬆嵌合方式將外環安裝於 轉子的情況，可能因爲外環的晃動造成噪音。 本新型的課題，是在內建馬達之自行車用輪轂，即使 以鬆嵌合方式將軸承的外環安裝於轉子，也能防止噪音。 [用以解決課題的手段] -3- M428893 第1新型的內建馬達之自行車用輪轂，是將自行車的 車輪的輪轂構成的內建馬達之自行車用輪轂。內建馬達之 自行車用輪轂’具備有：輪轂軸、馬達、第一軸承、第二 軸承、移動限制部、及按壓部。馬達’具備有：繞著輪轂 軸旋轉的轉子、以及相對於輪轂軸不能旋轉而配置於轉子 的外周側的定子。第一軸承，具有：第一內環、第一外環 、與第一滾動體；將轉子可自由旋轉地支承於輪轂軸。第 —內環，安裝於輪轂軸。第一外環，安裝於轉子。第一滾 動體，配置於第一內環及第一外環之間。第二軸承，具有 :第二內環、第二外環、與第二滾動體；在輪轂軸方向配 置成與第一軸承隔著間隔，將轉子可自由旋轉地支承於輪 轂軸。第二內環，安裝於輪轂軸。第二外環，安裝於轉子 。第二滾動體，配置於第二內環及第二外環之間。移動限 制部，將第一內環之遠離第二軸承的方向的移動加以限制 。按壓部，可將第一外環朝向第二軸承按壓。 在該內建馬達之自行車用輪轂，第一外環，是藉由按 壓部將其朝向第二軸承按壓。第一內環，藉由移動限制部 將其遠離第二軸承的方向的移動加以限制。藉此則即使第 一外環以鬆嵌合方式安裝於轉子，對於藉由移動限制構件 限制其移動的第一內環，則也能限制只有第一外環朝第二 軸承的相反側移動的情形。藉由將第一外環朝第二軸承的 相反側的移動加以限制，則能防止第一外環的晃動’即使 以鬆嵌合方式將軸承的外環安裝於轉子，也能防止噪音° 第2新型的內建馬達之自行車用輪轂，在第1新型的內 M428893 建馬達之自行車用輪轂’按壓部具有：用來彈壓第~外環 的彈壓構件。 在該情況，能藉由彈性體及彈簧構件等的彈壓構件， 來按壓第一外環’所以能穩定按壓第一外環。 第3新型的內建馬達之自行車用輪轂，在第2新型的內 建馬達之自行車用輪轂，彈壓構件是彈簧構件。 . 在該情況，線圈彈簧或盤簧等的彈簧構件，相較於橡 ^ 膠等的彈性體，能維持長時間穩定而能彈壓第一外環。 第4新型的內建馬達之自行車用輪轂，在第1〜3新型 其中任一的內建馬達之自行車用輪轂，進一步具備有：將 轉子的旋轉予以減速的減速機構。轉子是連結於減速機構 〇 在該情況，由於是藉由減速機構將馬達的旋轉予以減 速，則可以增大車輪的轉矩。 第5新型的內建馬達之自f了車用輪穀，在第4新型的內 φ 建馬達之自行車用輪轂，彈壓構件，其第一端部抵接於減 速機構，第二端部抵接於第一外環。 在該情況，由於彈壓構件是抵接於不同的構件，所以 彈壓構件的形狀及配置的自由度則提高。當配置彈壓構件 時’能有效率地利用其與減速機構之間產生的空間，能夠 防止：因爲配置彈壓構件而讓自行車用輪轂大型化的情形 〇 第6新型的內建馬達之自行車用輪轂，在第5新型的內 建馬達之自行車用輪轂，按壓部，具有：安裝於減速機構 -5- M428893 的第一定位部、以及可朝軸方向自由移動地安裝於轉子的 第二定位部。第一定位部，是將彈壓構件的第一端部側定 位於輪轂軸的直徑方向。第二定位部，是將彈壓構件的第 二端.部側定位於輪轂軸的直徑方向。 在該情況，由於將彈壓構件的輪轂軸的直徑方向的位 置定位，所以即使轉子旋轉而離心力作用於彈壓構件，彈 壓構件也不易朝彈壓方向以外的方向移動，讓彈壓力量穩 定。 第7新型的內建馬達之自行車用輪轂，在第5或6新型 的內建馬達之自行車用輪轂，減速機構，是具有太陽齒輪 的行星齒輪機構，該太陽齒輪可一體旋轉地連結於轉子》 彈壓構件的第一端部，抵接於太陽齒輪。 在該情況，由於彈壓構件抵接於一體旋轉的太陽齒輪 ，所以當轉子旋轉時，可使彈壓構件連同第一外環一起旋 轉，能夠防止彈壓構件與第一外環的相對摩擦移動。 第8新型的內建馬達之自行車用輪轂，在第1〜7新型 其中任一的內建馬達之自行車用輪轂，移動限制部，具有 :從輪轂軸的外周面突出形成，可與第一內環接觸的突起 〇 在該情況，只用在輪轂軸設置突起這樣簡單的構造， 就能限制第一內環的移動。 [新型效果] 藉由本新型，移動限制部側的第一外環，藉由按壓部 -6- M428893 將其朝向第二軸承按壓。第一內環，藉由移動限制部將其 遠離第二軸承的方向的移動加以限制。藉此則即使第一外 環以鬆嵌合方式安裝於轉子，對於藉由移動限制構件限制 其移動的第一內環，則也能限制只有第一外環朝第二軸承 的相反側移動。藉由將第一外環朝第二軸承的相反側的移 動加以限制，則能防止第一外環的晃動，即使以鬆嵌合方 - 式將軸承的外環安裝於轉子，也能防止噪音。 【實施方式】 在第1圖，本新型的一種實施方式的內建馬達之輪轂 10，是用於利用馬達來輔助人力驅動的電動輔助自行車。 <內建馬達之輪轂的槪略構造> 內建馬達之輪轂10，是用來構成自行車的前輪的輪轂 。內建馬達之輪轂10’安裝於自行車的前叉的前端的前爪 % 部1〇3a，用來輔助人力驅動。內建馬達之輪轂1〇，如第2 圖所示，具備有：輪轂軸15'馬達11、第一軸承66a、第 ~軸承66b、間隔件67、移動限制部68、及按壓部73。內 建馬達之輪轂10，進一步具備有：馬達殻體17、與收納於 馬達殻體17內的旋轉傳達機構25。馬達Η，具有：繞著輪 轂軸15旋轉的轉子21、以及相對於輪轂軸15不能旋轉而配 置於轉子21的外周側的定子22»第一軸承66a，_是用來將 轉子21可自由旋轉地支承於輪轂軸15的滾動軸承。第二軸 承66b’是在輪轂軸方向與第一軸承66a隔著間隔配置，且 M428893 用來將轉子21可自由旋轉地支承於輪轂軸15的滾動軸承。 移動限制部68，將第一軸承66a的遠離第二軸承66b的方向 的移動加以限制。按壓部73，將第一軸承66a的後述的第 一外環71b朝向第二軸承66b按壓。 〈輪轂軸> 輪轂軸15’是例如未進行淬火的鋼鐵等的鐵類金屬製 ’其兩端部不能旋轉地安裝於前爪部l〇3a。在輪轂軸15的 兩端外周面，形成有：讓用來固定於前爪部l〇3a的螺母構 件50螺合的左右的一對第一公螺紋部15&及第二公螺紋部 15b。在第一公螺紋部15a及第二公螺紋部15b的外周面， 形成有：具有互相平行的兩面部的第——^止部15c及第二 卡止部15d。在第二卡止部15d的輪轂軸方向內側，形成有 :將馬達殻體17的後述的第一殼體構件32不能旋轉地連結 的旋轉卡止部15e。讓螺母構件50、與第一鎖定螺母51， 螺合於第一公螺紋部15a。讓螺母構件50、與用來將第一 殼體構件32固定於輪轂軸15的第二鎖定螺母52，螺合於第 二公螺紋部15b。在螺母構件50的軸方向內側，分別安裝 著止轉墊片54，該止轉墊片54，分別不能旋轉地卡合於第 —卡止部15c及第二卡止部I5d，且卡合於前叉的安裝溝部 ’用來防止輪轂軸15轉動。 在第一公螺紋部15 a的輪轂軸方向內側，形成有讓軸 承31螺合的第三公螺紋部15f，該軸承31是可自由旋轉地 支承著馬達殼體17的後述的第二殼體構件3 4的第二端部。 M428893 輪轂軸15的中間部分，是較第一公螺紋部15 a及第二公螺 紋部15b更大直徑。 在輪轂軸15的第一軸承66a的安裝部分，形成有：以 從外周面突出的突起所構成的移動限制部68。移動限制部 68，在該實施方式，是以.與輪轂軸15形成爲一體的環狀突 起68a所構成。移動限制部68，與第一軸承66a的後述的第 —內環71a接觸，將第一內環71a的遠離第二軸承66b的方 向的移動加以限制。 <馬達殼體> 如第2圖所示，馬達殼體17，具有：不能旋轉地與輪 轂軸15連結的第一殼體構件32、以及其第一端部（第2圖 右端）可自由旋轉地支承於第一殼體構件32且第二端部（ 第2圖左端）可自由旋轉地支承於輪轂軸15的第二殼體構 件34。第二殼體構件34例如是藉由鋁合金所形成。 第一殼體構件32，具有：不能旋轉地安裝於輪轂軸15 的殼體主體36、以及固定於殻體主體3 6的外側面的外殼構 件38。在外殻構件38與殼體主體36之間形成有空間。殼體 主體3 6及外殼構件3 8，例如是藉由鋁合金所形成。 殼體主體36，具有：不能旋轉地與輪轂軸15連結的第 —轂部36a、與第一轂部36a形成爲一體的圓形的隔壁部 36b、以及從隔壁部36b的外周部朝向第二殼體構件34延伸 的筒狀的第一圓筒部36c。在第一轂部36a的內周面，形成 有：不能旋轉地與輪轂軸15的旋轉卡止部15e連結的非圓 -9 - M428893 形的連結孔36d。殼體主體36，藉由第二鎖定螺母52而不 能旋轉地固定於輪轂軸15。 隔壁部36b的外側面爲大致平坦面。在隔壁部36b的內 側面，形成有：用來將馬達1 1的定子22的位置進行調整的 筒部43d。在筒部43d的直徑方向外側的隔壁部36b的內側 面，在周方向隔著間隔形成有：藉由螺栓構件39來將馬達 11的定子22固定的複數（例如3個）的螺絲孔43e。在隔壁 部3 6b的第一圓筒部36c與筒部43d之間，形成有：在周方 向隔著間隔配置的複數（例如3個）的安裝部4 3 f » 在第一圓筒部36c的外周面，安裝有：可自由旋轉地 支承著第二殼體構件34的第一端部，例如滾珠軸承的型態 的軸承30的內環30a。在第一圓筒部36c的前端部外周面， 同心地定位嵌合著：不能旋轉地與第一圓筒部36c連結的 筒狀的齒輪安裝部35。齒輪安裝部35，與第一圓筒部36c 的外周面嵌合的一端部（第2圖右端），具有：圓筒部分 35a、以及在圓筒部分35 a的內周面形成爲一體的環狀的安 裝部分35b。在圓筒部分35a的另一端部（第2圖左端）的 內周面，具有：不能旋轉地連結著後述的內齒齒輪4 8b的 鋸齒部35c。齒輪安裝部35，藉由螺栓構件45固定於三個 安裝部43f。 外殼構件38，如第1圖所示，在外側面具有凹部32a及 突出部32b。凹部32a，爲了可將各種形狀的前叉插入，而 形成爲較平常的前叉的前端的形狀更稍寬。 如第2圖所示，第二殼體構件34，是與平常的自行車 -10- M428893 用輪轂的輪轂罩類似的構造，爲有底筒狀部的構件。第二 殼體構件34，具有：被支承於軸承31的第二轂部3 4b、與 第二轂部34b形成爲一體的圓板部34c、以及從圓板部34c 的外周部筒狀地朝輪轂軸方向內側延伸的第二圓筒部3 4d 〇 在第二轂部34 b的內周面，在其與輪轂軸15之間安裝 有軸承31。軸承31，其內環31a螺合於：在輪轂軸15形成 的第三公螺紋部15f，而可調整軸方向位置。調整後的內 環31a’藉由第一鎖定螺母51防止其轉動。外環31b是安裝 於第二轂部34b的內周面。 第二圓筒部34d，配置於第一圓筒部36 c的外周側。在 第二圓筒部34d的第一端側內周面安裝有軸承30的外環30b 。在第二圓筒部34d的外周面，在輪轂軸方向的兩端部隔 著間隔而形成有：藉由輻條（鋼絲）將前輪的輪圈與內建 馬達之輪轂10連結用的第一輪轂凸緣40a及第二輪轂凸緣 40b 〇 <馬達> 馬達1 1，如前述，具有：轉子2 1、以及與轉子2 1相對 向而配置於轉子21的外周側的定子22。 轉子21，可自由旋轉地被支承於輪轂軸15。轉子21， 具有：例如在周方向具有複數的磁極的磁鐵2 1 a、以及用 來保持磁鐵21 a的磁鐵保持部21b。磁鐵保持部21b，是藉 由在輪轂軸方向隔著間隔配置的第一軸承66a及第二軸承 -11 - M428893 66b，可自由旋轉地被支承於輪轂軸15。 定子22，配置於轉子21的外周側。定子22，具有：固 定於殼體主體36的隔壁部3 6b，在周方向隔著間隔配置的 t 複數（例如6個）的線圈部46。定子22，具有用來將線圈 部46固定的安裝部49。安裝部49，其功能作爲軛部。安裝 部49,是金屬製的筒狀構件，在一端外周面具有三個固定 用的凸部49a。安裝部49，安裝於定心筒部43d的外周面， 藉由定心筒部43d將其內周面定中心。在該實施方式，藉 由貫穿於凸部49a而螺合於螺絲孔43e的三支螺栓構件39， 將安裝部49固定於隔壁部3 6b。複數的線圈部46，藉由沒 有圖示的馬達控制電路，藉由切換的交流而依序激磁，使 轉子21朝自行車的行進方向旋轉。 <第一軸承及第二軸承以及間隔件〉 第一軸承66a，如第3圖所示，配置在：轉子21的旋轉 軸線方向的第一端部的內周面與輪轂軸15的外周面之間。 第一軸承6 6a，具有：安裝於輪轂軸15的第一內環71a、安 裝於轉子21的第一外環71b、以及配置於第一內環71 a及第 —外環71b之間的第一滚動體71c。第一內環71a，如上述 配置成與移動限制部68接觸。第一內環71a’以緊嵌合方 式安裝於輪轂軸15的外周面。於是’第一內環71a’藉由 壓入於輪轂軸15的外周面而與移動限制部68接觸固定。第 一內環71a，藉由包含：間隔件67、第二內環72b、第一轂 部36a及第二鎖定螺母52之第一內輪按壓構造’而被朝移 -12- M428893 動限制部6 8側按壓。第一外環7 1 b，以被限制其朝第二軸 承66b側的移動的狀態，以鬆嵌合方式安裝於：在轉子21 的第一端部的內周面朝磁鐵保持部21b凹入形成的第一軸 承收納部21c。第一外環71b的第二軸承66b側的側面，也 可與磁鐵保持部21b的凹部的落差部分接觸，也可與磁鐵 保持部21b的凹部的落差部分稍微分離。 第二軸承66b，配置於：轉子21的磁鐵保持部21b的旋 轉軸線方向的第二端部的內周(面、與輪轂軸15的外周面之 間。第二軸承66b，具有：安裝於輪轂軸15的第二內環72a 、安裝於轉子1的第二外環72b、以及配置於第二內環72a 及第二外環72b之間的第二滾動體72c。第二內環72a，配 置成隔著第一內環71a與間隔件67。第二內環72a，以鬆嵌 合方式安裝於輪轂軸15的外周面。可是第二內環72a，配 置於間隔件67與殼體主體36的第一轂部36a之間，無法朝 輪轂軸方向移動。 在輪轂軸15，當第一內環與第二內環的內徑相同時， 第二內環72a的第二安裝部分15h，其外徑稍小於第一內環 71 a的第一安裝部分15g。藉此，能以鬆嵌合方式安裝第二 內環72a。在第3圖，爲了容易理解，而將第一安裝部分 15 g與第二安裝部分15h的外徑的差描繪得較實際更大。當 第一內環的內徑稍大於第二內環的內徑時，則可以將第二 安裝部分1 5h作成與第一安裝部分15 g相等的外型。第二外 環72b，以緊嵌合方式安裝於：在轉子21的第二端部朝磁 鐵保持部21b的內周面凹入形成的第二軸承收納部21d。於 -13- M428893 是，第二外環72b藉由壓入方式而固定於第二軸承收納部 21d。第二外環72b的第一外環71a側的側面，與磁鐵保持 部21b的凹部的落差部分接觸，將第二外環72b定位。 在輪轂軸15，第二安裝部分15h、與形成有第二公螺 紋部15b的部分的落差部15i，是位於：較第二軸承66b的 與第一軸承66a爲相反側的端面更靠近第一軸承66a側處。 第-安裝部分15g與第二安裝部分15h的交界部分15j，是 位於：較第二軸承66b的第一軸承66a側的端面更靠近第一 軸承66a側處》 間隔件67，是配置於第一內環71 a與第二內環72a之間 的金屬製的筒狀的構件。間隔件67，其所具有的內徑較輪 轂軸15的外徑更大。間隔件67的接觸於第一內環71a的部 分的外徑，只要小於第一外環71b的內徑即可，間隔件67 的接觸於第二內環72a的部分的外徑，只要小於第二外環 72b的內徑即可。在該實施方式，間隔件67的外徑，較第 —內環71 a及第二內環7 2a的外徑更小。藉由該間隔件67， 來防止：以鬆動嵌合方式於輪轂軸15安裝的第二軸承66b 的第二內環72 a的軸方向及旋轉方向的移動。爲了達成該 目的，第二鎖定螺母52作爲按壓構件的功能，將第二內環 72a朝第一內環71a側按壓。第二鎖定螺母52，如前述，是 用來將殻體主體36固定於輪轂軸。可是，當將第二鎖定螺 母52旋入時，第二鎖定螺母52按壓殼體主體36，殼體主體 36的第一轂部36a按壓第二內環72a。當按壓第二內環72a 而接觸於間隔件67時，由於間隔件67無法進一步移動，所 -14- M428893 以第二內環72a，成爲被第二鎖定螺母52按壓的狀態。藉 此，限制了第二內環72a的輪轂軸方向及旋轉方向的移動 。因此，第一內環71a及第二內環72a不易對於輪轂軸15滑 動，讓輪轂軸15、第一內環71a及第二內環72a不易磨耗。 這裡雖然殻體主體36接觸於第二內環72a，而也可在殼體 主體36與第二內環72a之間設置環狀構件，經由該環狀構 件讓殻體主體36按壓第二內環72a » <旋轉傳達機構> 旋轉傳達機構25，如第2圖所示，是用來將轉子21的 旋轉減速而傳達到第二殼體構件34。旋轉傳達機構25，當 再生制動時，使第二殻體構件34的旋轉增速而傳達到轉子 21。旋轉傳達機構25，具有行星齒輪機構48。行星齒輪機 構48，是減速機構的一個例子》行星齒輪機構48，具有： 太陽齒輪48a、配置於太陽齒輪48a的外周側的內齒齒輪 48b、以及與太陽齒輪48 a與內齒齒輪48b嚙合的複數（例 如3個）的行星齒輪48c。太陽齒輪48a，具有用來與轉子 21連結的連結部分48e。連結部分48e’形成爲例如筒狀， 相較於形成有太陽齒輪48的齒部的部分’具有更大的內徑 。太陽齒輪48a，藉由安裝於連結部分48e的螺栓構件55, 而可一體旋轉地連結於轉子21的磁鐵保持部21b。內齒齒 輪48b，是不能旋轉地連結於殼體主體36的齒輪安裝部35 。複數的行星齒輪48c，藉由載體48d而可旋轉地支承著。 各行星齒輪4 8c，具有齒數不同的兩個第一齒輪部5 6a及第 -15- M428893 二齒輪部56b。第一齒輪部56a’與太陽齒輪48a嚙合’第 二齒輪部56b，與內齒齒輪48b嚙合。載體48d’固定於第 二殼體構件34的圓板部34c的內側面。在該行星齒輪機構 48，由於設置於殼體主體36的內齒齒輪48b是不能旋轉地 固定於輪轂軸15，所以讓連結著轉子21的太陽齒輪48a的 旋轉減速而傳達到第二殼體構件34。 <按壓部> 按壓部73，如第3圖所示，具有：其旋轉軸線方向的 第一端部抵接於太陽齒輪48a，其第二端部抵接於第一外 環71b之彈壓構件74。按壓部73，進一步具有：將彈壓構 件74的第一端部側定位於輪轂軸15的直徑方向的第一定位 部75、以及將彈壓構件74的第二端部側定位於輪轂軸15的 直徑方向的第二定位部76。彈壓構件74具有：配置於輪轂 軸15的外周側，以壓縮狀態配眞於太陽齒輪48a與第一外 環71b之間的作爲彈簧構件的線圈彈簧74a。藉由該線圈彈 簧74a，能夠防止被鬆嵌合的第一外環71b的晃動情形。 第一定位部75，是在太陽齒輪48a的連結部分48e的內 周側配置的筒狀的構件，具有：第一凸緣部75a、與第一 筒部75b。第一凸緣部75a朝半徑方向延伸，而設置成與連 結部分48e的內周面抵接的第一凸緣部75a，也可固定於連 結部分48e的內周面。第一筒部75b，從第一凸緣部75的內 周部朝向輪轂軸的軸線方向延伸，配置於線圈彈簧74 a的 內周側而將線圈彈簧7 4 a於直徑方向定位。 -16- M428893 第二定位部76’是與第一定位部75同樣形狀的具有凸 緣的筒狀構件，具有：第二凸緣部76a、與第二筒部76b。 第二定位部76，配置於：轉子21及連結構件48e的至少其 中一方的內周部。第—.定位部76，是於輪穀軸方向可自由 移動地安裝於磁鐵保持部21b的第一軸承收納部21c。第二 凸緣部76a，抵接於第一外環71b的端面。第二凸緣部76a ，藉由第一軸承收容部21c限制其半徑方向的移動。第二 凸緣部76a也可設置成接觸於第一軸承收容部21c〇第二筒 部76b’從第二凸緣部76的內周部朝向輪轂軸的軸線方向 延伸，配置於線圏彈簧74 a的內周側而將線圏彈簧7 4a定位 於直徑方向。 藉由第一定位部75及第二定位部76，即使轉子21旋轉 而離心力作用於彈壓構件74，彈壓構件74不易朝彈壓方向 以外的方向移動’讓彈壓力穩定。而當將線圈彈簧74 a安 裝於太陽齒輪48a與磁鐵保持部21b之間時，能藉由第一定 位部75及第二定位部76防止線圈彈簧74a脫落，所以容易 進行線圈彈簧74a的安裝。 <轉子的組裝順序> 當將轉子21組裝到輪轂軸15時，先將第一軸承66a壓 入到輪轂軸15的第一安裝部分15g。當壓入時，使用適當 的夾具按壓第一內環71a，直到讓第一軸承66a的第一內環 71a接觸於移動限制部68。而將第二軸承66b的第二外環 72b壓入到轉子21的磁鐵保持部21b的第二軸承收納部21d -17- M428893 。當該壓入時，也使用適當的夾具按壓第二內環72b，直 到讓第二軸承66b的第二外環72b接觸於第二軸承收納部 21d的壁面。當將第一軸承66a安裝於輪轂軸15，將第二軸 承66b安裝於轉子21時，在輪轂軸15的外周側將間隔件67 安裝成接觸於第一內環71a。在該狀態將安裝著第二軸承 66b的轉子21安裝於輪轂軸I5。此時，使第一軸承66a的第 —外環71b嵌合於第一軸承收納部21c，使第二軸承661)的 第二內環72 a嵌合於輪轂軸15的外周面》 接著，將第一定位部75及第二定位部76分別安裝於： 太陽齒輪48a的筒狀連結部分48e及磁鐵保持部21b的第一 軸承收納部21c。然後將線圈彈簧74 a配置在第一定位部75 的第一筒部75b及第二定位部76的第二筒部76b的外周側， 藉由螺栓構件55將太陽齒輪48a固定在磁鐵保持部21b。藉 此，壓縮線圈彈簧74 a，藉由線圏彈簧74a將第一外環7ib 朝向第二軸承按壓。藉由將第一外環71b朝第二軸承6 6b的 相反側的移動加以限制，則能防止第一外環66a的晃動。 因此，即使以鬆嵌合方式將第一軸承66a的第一外環71b安 裝於轉子21，也能防止噪音。 然後使預先安裝有定子22之殻體主體36的第一轂部 36a，卡合於輪轂軸15的旋轉卡止部15e。接著，藉由將第 二鎖定螺母52旋入緊固於第二公螺紋部15b，讓第一轂部 36a按壓第二內環72a。在被按壓的第二內環72a接觸間隔 件67之後，進一步將第二鎖定螺母52旋入的話，則在間隔 件67與第一轂部36a之間經由第一轂部36a按壓第二內環 -18- M428893 72a。藉此，限制第二內環72a的朝輪轂軸方向及旋轉方向 的移動。結果，能減輕輪轂軸15及第二內環72 a的磨耗。 <其他實施方式> 以上，雖然針對本新型的一種實施方式來說明，而本 .新型並不限定於上述實施方式，在不脫離新型的主旨的範 圍可進行各種變更》 φ (a)在上述實施方式，雖然揭示有前輪用的內建馬 達的輪轂，而後輪用的內建馬達的輪轂也適用本新型。 (b)在上述實施方式，雖然圖示滾珠軸承作爲滾動 軸承，而滾動軸承並不限定爲滾珠軸承。 (c)馬達11的機械構造，並不限定於上述構造。例如 在上述實施方式，雖然是內轉子的馬達，而也可以是外轉 子的馬達。 (d) 在上述實施方式，雖然將移動限制部68的突起 φ 作爲與輪轂軸一體成形的環狀突起，而本新型並不限定於 此。突起是與輪轂軸爲同一體或不同個體都可以。突起只 要從外周面突出而能限制第一內環的移動即可，例如也可 放射狀地設置有複數個。可是，一體形成的環狀突起，機 械加工較容易且能減低成本。 (e) 在上述實施方式’雖然將按壓部73配置於太陽 齒輪48a與第一外環71b之間’而本新型並不限定於此。例 如，作爲按壓部73，也可配置有：其一端卡止於第一軸承 收納部21c的內周面，另一端與第一外環71b接觸的盤簧或 -19- M428893 波浪狀板簧等的彈簧構件或橡膠等的彈性體。於是，彈簧 構件並不限定於線圈彈簧，上述的盤簧或波浪狀板簧也可 以。也能使用竹筍狀（錐狀）彈簧等。 (f)在上述實施方式，雖然舉例了使用於按壓部的 作爲彈壓構件的彈簧構件，而按壓構件，只要是可將第一 外環71b朝向第二軸承66b按壓的構件即可，任何型態都可 以。例如，也可在第一軸承收納部21c的內周面形成母螺 紋部，將螺絲構件螺合於母螺紋部來按壓第一外環71b。 【圖式簡單說明】 第1圖爲本新型的一種實施方式的內建馬達之輪轂的 立體圖。 第2圖爲內建馬達之輪轂的剖面圖。 第3圖爲轉子支承部分的剖面放大圖。 【主要元件符號說明】 I 〇 :內建馬達之輪轂 II :馬達 1 5 :輪轂軸 21 :轉子 22 :定子 48 :行星齒輪機構 48a :太陽齒輪 66a :第一軸承 •20- M428893 66b :第二軸承 6 8 :移動限制部 6 8 a :環狀突起M428893 V. New description: [New technical field] The present invention relates to a bicycle hub, and more particularly to a bicycle hub for a built-in motor of a hub of a bicycle wheel. [Prior Art] A conventional bicycle has a power-assisted self-fr vehicle that is assisted by a motor to obtain a driving force. In the electric assist bicycle, there is provided a bicycle hub with a built-in motor. A bicycle hub for a conventional built-in motor supports a rotor by a pair of left and right rolling bearings (for example, refer to Patent Document 1). [Prior Art] [Patent Document 1] [Patent Document 1] JP-A-2005-3 3 5536 [New Content] [New problem to be solved] For example, considering the assemblability, the outer ring needs to be loosely fitted. In the case of the rotor, noise may be caused by the sway of the outer ring. The problem of the present invention is that the bicycle hub for the built-in motor can prevent noise even when the outer ring of the bearing is attached to the rotor by loose fitting. [Means for Solving the Problem] -3- M428893 The bicycle hub for the built-in motor of the first type is a bicycle hub for a built-in motor that includes a hub of a bicycle wheel. The bicycle hub of the built-in motor includes a hub shaft, a motor, a first bearing, a second bearing, a movement restricting portion, and a pressing portion. The motor ' includes a rotor that rotates around the hub axis, and a stator that is disposed on the outer peripheral side of the rotor so as not to rotate with respect to the hub axle. The first bearing has a first inner ring, a first outer ring, and a first rolling element; and the rotor is rotatably supported by the hub axle. The first inner ring is mounted on the hub axle. The first outer ring is mounted to the rotor. The first rolling body is disposed between the first inner ring and the first outer ring. The second bearing has a second inner ring, a second outer ring, and a second rolling element; the rotor is rotatably supported by the hub shaft so as to be spaced apart from the first bearing in the hub axial direction. The second inner ring is mounted to the hub axle. The second outer ring is mounted to the rotor. The second rolling body is disposed between the second inner ring and the second outer ring. The movement restricting portion limits the movement of the first inner ring away from the second bearing. The pressing portion presses the first outer ring toward the second bearing. In the bicycle hub in which the motor is built, the first outer ring is pressed toward the second bearing by the pressing portion. The first inner ring is limited by the movement of the movement restricting portion away from the second bearing. Thereby, even if the first outer ring is loosely fitted to the rotor, the first inner ring that restricts its movement by the movement restricting member can also restrict the movement of only the first outer ring toward the opposite side of the second bearing. situation. By restricting the movement of the first outer ring toward the opposite side of the second bearing, it is possible to prevent the first outer ring from swaying'. Even if the outer ring of the bearing is attached to the rotor by loose fitting, noise can be prevented. 2 The bicycle hub for the new built-in motor, the bicycle hub of the first new type M428893 built-in motor has a pressing member for biasing the first to outer rings. In this case, the first outer ring can be pressed by the elastic member such as the elastic body or the spring member, so that the first outer ring can be stably pressed. The bicycle hub for a built-in motor of the third type is a spring type member in the bicycle hub of the second novel built-in motor. In this case, the spring member such as the coil spring or the coil spring can be stretched for a long period of time to be able to elastically press the first outer ring as compared with the elastic body such as rubber. In the bicycle hub for a built-in motor of the fourth aspect, the bicycle hub of the built-in motor of any of the first to third types further includes a speed reduction mechanism that decelerates the rotation of the rotor. The rotor is coupled to the speed reduction mechanism. In this case, the torque of the wheel can be increased by decelerating the rotation of the motor by the speed reduction mechanism. In the fifth type of the built-in motor, the bicycle wheel hub of the fourth type of inner motor is formed, and the first end portion abuts against the speed reduction mechanism, and the second end portion abuts. In the first outer ring. In this case, since the elastic member abuts against the different members, the degree of freedom in the shape and arrangement of the biasing member is improved. When the elastic member is disposed, the space generated between the reduction mechanism and the speed reduction mechanism can be utilized efficiently, and it is possible to prevent the bicycle hub from being enlarged by the arrangement of the elastic member. In the bicycle hub for a built-in motor of the fifth aspect, the pressing portion has a first positioning portion that is attached to the speed reduction mechanism -5 to M428893, and a second positioning portion that is attached to the rotor so as to be movable in the axial direction. The first positioning portion is such that the first end side of the biasing member is positioned in the diameter direction of the hub axle. The second positioning portion positions the second end portion side of the biasing member in the diameter direction of the hub shaft. In this case, since the position of the hub shaft of the biasing member in the radial direction is positioned, even if the rotor rotates and the centrifugal force acts on the biasing member, the elastic member does not easily move in a direction other than the biasing direction, and the amount of the elastic pressure is stabilized. The bicycle hub for the built-in motor of the seventh type, the bicycle hub for the built-in motor of the fifth or sixth type, and the speed reduction mechanism is a planetary gear mechanism having a sun gear, and the sun gear can be integrally coupled to the rotor by rotation. The first end of the biasing member abuts against the sun gear. In this case, since the biasing member abuts against the integrally rotating sun gear, when the rotor rotates, the biasing member can be rotated together with the first outer ring, and the relative frictional movement of the biasing member and the first outer ring can be prevented. A bicycle hub for a built-in motor of the eighth aspect, the bicycle hub of the built-in motor according to any one of the first to seventh aspects, wherein the movement restricting portion is formed to protrude from an outer peripheral surface of the hub shaft, and is compatible with the first inner portion In this case, the movement of the first inner ring can be restricted by the simple configuration in which the boss shaft is provided with a projection. [New effect] With the present invention, the first outer ring on the side of the movement restricting portion is pressed toward the second bearing by the pressing portion -6-M428893. The first inner ring is limited by the movement of the movement restricting portion away from the second bearing. Thereby, even if the first outer ring is attached to the rotor in a loose fitting manner, the first inner ring that restricts its movement by the movement restricting member can restrict the movement of only the first outer ring toward the opposite side of the second bearing. By restricting the movement of the first outer ring toward the opposite side of the second bearing, it is possible to prevent the first outer ring from rattling, and the noise can be prevented even if the outer ring of the bearing is attached to the rotor in a loose fitting manner. . [Embodiment] In Fig. 1, a hub 10 of a built-in motor according to an embodiment of the present invention is a power-assisted bicycle for assisting human power driving by a motor. <Simplified structure of the hub of the built-in motor> The hub 10 of the built-in motor is a hub for constituting the front wheel of the bicycle. The hub 10' of the built-in motor is attached to the front pawl portion 1〇3a of the front end of the front fork of the bicycle for assisting human power driving. As shown in Fig. 2, the hub of the built-in motor includes a hub shaft 15' motor 11, a first bearing 66a, a first bearing 66b, a spacer 67, a movement restricting portion 68, and a pressing portion 73. The hub 10 for the built-in motor further includes a motor housing 17 and a rotation transmission mechanism 25 housed in the motor housing 17. The motor 具有 has a rotor 21 that rotates around the hub axle 15 and a stator 22»first bearing 66a that is disposed on the outer peripheral side of the rotor 21 so as not to rotate with respect to the hub axle 15, and is used to rotate the rotor 21 freely. A rolling bearing that is supported by the hub axle 15 . The second bearing 66b' is disposed at a distance from the first bearing 66a in the hub axis direction, and M428893 is used to support the rolling bearing of the hub shaft 15 in a rotatable manner. The movement restricting portion 68 restricts the movement of the first bearing 66a in the direction away from the second bearing 66b. The pressing portion 73 presses the first outer ring 71b, which will be described later, of the first bearing 66a toward the second bearing 66b. <Wheel axle> The hub axle 15' is made of, for example, ferrous metal such as steel which is not quenched. The both end portions are attached to the front claw portion 10a in a non-rotatable manner. On the outer circumferential surfaces of both ends of the hub axle 15, a pair of left and right first male screw portions 15' and a second male screw portion 15b for screwing the nut members 50 fixed to the front claw portions 10a are formed. On the outer circumferential surfaces of the first male screw portion 15a and the second male screw portion 15b, a first stopper portion 15c and a second locking portion 15d having two faces parallel to each other are formed. On the inner side in the hub axial direction of the second locking portion 15d, a rotation locking portion 15e that non-rotatably connects the first housing member 32, which will be described later, of the motor housing 17 is formed. The nut member 50 and the first lock nut 51 are screwed to the first male screw portion 15a. The nut member 50 and the second lock nut 52 for fixing the first case member 32 to the hub axle 15 are screwed to the second male screw portion 15b. On the inner side in the axial direction of the nut member 50, a rotation preventing washer 54 is attached, and the rotation preventing washer 54 is rotatably engaged with the first locking portion 15c and the second locking portion I5d, respectively, and is engaged with The mounting groove portion of the front fork is used to prevent the hub axle 15 from rotating. A third male screw portion 15f for screwing the bearing 31 is formed on the inner side in the hub axial direction of the first male screw portion 15a, and the bearing 31 is a second housing to be described later that rotatably supports the motor housing 17. The second end of member 34. M428893 The middle portion of the hub axle 15 is larger than the first male thread portion 15a and the second male thread portion 15b. In the attachment portion of the first bearing 66a of the hub axle 15, a movement restricting portion 68 composed of a projection projecting from the outer peripheral surface is formed. The movement restricting portion 68 is constituted by an annular projection 68a integrally formed with the hub axle 15 in this embodiment. The movement restricting portion 68 is in contact with the first inner ring 71a of the first bearing 66a, which will be described later, and restricts the movement of the first inner ring 71a away from the second bearing 66b. <Motor housing> As shown in Fig. 2, the motor housing 17 has a first housing member 32 that is non-rotatably coupled to the hub axle 15, and a first end portion (second right end of the second drawing) The second housing member 34 is rotatably supported by the first housing member 32 and the second end portion (left end of FIG. 2) is rotatably supported by the second housing member 34 of the hub axle 15. The second housing member 34 is formed, for example, of an aluminum alloy. The first case member 32 has a case body 36 that is non-rotatably attached to the hub axle 15, and a case member 38 that is fixed to the outer side surface of the case body 36. A space is formed between the outer casing member 38 and the casing main body 36. The housing main body 36 and the outer casing member 38 are formed, for example, of an aluminum alloy. The case main body 36 has a first boss portion 36a that is non-rotatably coupled to the hub axle 15, a circular partition wall portion 36b that is integrally formed with the first hub portion 36a, and a second peripheral portion 36b that is formed from the outer peripheral portion of the partition wall portion 36b. The cylindrical first cylindrical portion 36c extends from the case member 34. A non-circular -9 - M428893-shaped connecting hole 36d that is non-rotatably coupled to the rotation locking portion 15e of the hub axle 15 is formed on the inner circumferential surface of the first boss portion 36a. The housing body 36 is non-rotatably fixed to the hub axle 15 by a second lock nut 52. The outer side surface of the partition portion 36b is a substantially flat surface. A cylindrical portion 43d for adjusting the position of the stator 22 of the motor 11 is formed on the inner side surface of the partition portion 36b. On the inner side surface of the partition wall portion 36b on the outer side in the radial direction of the tubular portion 43d, a plurality of (for example, three) screw holes 43e for fixing the stator 22 of the motor 11 by the bolt member 39 are formed at intervals in the circumferential direction. Between the first cylindrical portion 36c of the partition portion 36b and the tubular portion 43d, a plurality (for example, three) of mounting portions 4 3 f » which are disposed at intervals in the circumferential direction are formed in the first cylindrical portion 36c The outer peripheral surface is mounted with a first end portion of the second housing member 34 rotatably supported, for example, an inner ring 30a of the bearing 30 of the ball bearing type. A cylindrical gear mounting portion 35 that is non-rotatably coupled to the first cylindrical portion 36c is concentrically positioned and fitted to the outer peripheral surface of the front end portion of the first cylindrical portion 36c. The gear attachment portion 35 has one end portion (second right end) fitted to the outer circumferential surface of the first cylindrical portion 36c, and has a cylindrical portion 35a and a ring integrally formed on the inner circumferential surface of the cylindrical portion 35a. The mounting portion 35b. The inner peripheral surface of the other end portion (the left end of Fig. 2) of the cylindrical portion 35a has a serration portion 35c that is non-rotatably coupled to an internally toothed gear 48b, which will be described later. The gear mounting portion 35 is fixed to the three mounting portions 43f by bolt members 45. As shown in Fig. 1, the outer casing member 38 has a concave portion 32a and a protruding portion 32b on the outer side surface. The recess 32a is formed to have a shape slightly wider than the front end of the usual front fork in order to insert the forks of various shapes. As shown in Fig. 2, the second case member 34 is a member similar to the hub cover of the conventional bicycle -10- M428893, and is a member having a bottomed cylindrical portion. The second case member 34 has a second boss portion 34b supported by the bearing 31, a disc portion 34c integrally formed with the second boss portion 34b, and a cylindrical portion from the outer peripheral portion of the disc portion 34c. A second cylindrical portion 3d extending from the inner side in the hub axis direction is disposed on the inner peripheral surface of the second boss portion 34b, and a bearing 31 is attached between the hub portion 34b and the hub shaft 15. The bearing 31 has an inner ring 31a screwed to a third male screw portion 15f formed in the hub axle 15, and the axial direction position can be adjusted. The adjusted inner ring 31a' is prevented from rotating by the first lock nut 51. The outer ring 31b is attached to the inner peripheral surface of the second boss portion 34b. The second cylindrical portion 34d is disposed on the outer peripheral side of the first cylindrical portion 36c. An outer ring 30b of the bearing 30 is attached to the inner peripheral surface of the first end side of the second cylindrical portion 34d. On the outer peripheral surface of the second cylindrical portion 34d, a first hub for connecting the rim of the front wheel and the hub 10 of the built-in motor by spokes (wires) is formed at intervals between both end portions in the hub axial direction. The flange 40a and the second hub flange 40b 〇 <motor> The motor 1 1 has the rotor 21 and the stator 22 disposed on the outer peripheral side of the rotor 21 so as to face the rotor 21 as described above. The rotor 21 is rotatably supported by the hub axle 15. The rotor 21 has, for example, a magnet 2 1 a having a plurality of magnetic poles in the circumferential direction and a magnet holding portion 21 b for holding the magnet 21 a. The magnet holding portion 21b is rotatably supported by the hub axle 15 by a first bearing 66a and a second bearing -11 - M428893 66b which are disposed at intervals in the hub axis direction. The stator 22 is disposed on the outer peripheral side of the rotor 21. The stator 22 has a partition portion 36b fixed to the casing main body 36, and a plurality of (for example, six) coil portions 46 arranged at intervals in the circumferential direction. The stator 22 has a mounting portion 49 for fixing the coil portion 46. The mounting portion 49 functions as a yoke. The mounting portion 49 is a cylindrical member made of metal, and has three fixing projections 49a on the outer peripheral surface of one end. The attachment portion 49 is attached to the outer circumferential surface of the centering cylinder portion 43d, and the inner circumferential surface thereof is centered by the centering cylinder portion 43d. In this embodiment, the attachment portion 49 is fixed to the partition portion 36b by the three bolt members 39 which are screwed into the screw holes 43e through the projections 49a. The plurality of coil portions 46 are sequentially excited by the switched alternating current by a motor control circuit (not shown) to rotate the rotor 21 in the traveling direction of the bicycle. <First Bearing and Second Bearing and Spacer 〉 The first bearing 66a is disposed on the inner circumferential surface of the first end portion of the rotor 21 in the rotation axis direction and the outer circumferential surface of the hub axle 15 as shown in Fig. 3 between. The first bearing 6 6a has a first inner ring 71a attached to the hub axle 15, a first outer ring 71b attached to the rotor 21, and a first portion disposed between the first inner ring 71a and the outer ring 71b. A rolling body 71c. The first inner ring 71a is disposed in contact with the movement restricting portion 68 as described above. The first inner ring 71a' is attached to the outer peripheral surface of the hub axle 15 in a tight fitting manner. Then, the first inner ring 71a' is pressed and fixed to the movement restricting portion 68 by being press-fitted into the outer peripheral surface of the hub axle 15. The first inner ring 71a is moved toward the -12-M428893 by the first inner wheel pressing structure of the spacer 67, the second inner ring 72b, the first hub 36a and the second lock nut 52. 6 8 side presses. The first outer ring 7 1 b is attached to the inner peripheral surface of the first end portion of the rotor 21 toward the magnet holding portion 21b in a state of being restricted from moving toward the second bearing 66b side. The first bearing housing portion 21c is formed. The side surface of the first outer ring 71b on the second bearing 66b side may be in contact with the falling portion of the concave portion of the magnet holding portion 21b, or may be slightly separated from the falling portion of the concave portion of the magnet holding portion 21b. The second bearing 66b is disposed between the inner circumference of the second end portion of the magnet holding portion 21b of the rotor 21 in the rotation axis direction (the surface and the outer circumferential surface of the hub shaft 15. The second bearing 66b has a mounting on the hub a second inner ring 72a of the shaft 15, a second outer ring 72b attached to the rotor 1, and a second rolling element 72c disposed between the second inner ring 72a and the second outer ring 72b. The second inner ring 72a is disposed The first inner ring 71a and the spacer 67 are interposed. The second inner ring 72a is loosely fitted to the outer peripheral surface of the hub axle 15. The second inner ring 72a is disposed on the spacer 67 and the housing main body 36. The first hub portion 36a cannot move in the hub axis direction. In the hub axle 15, when the inner diameters of the first inner ring and the second inner ring are the same, the second mounting portion 15h of the second inner ring 72a, The outer diameter is slightly smaller than the first mounting portion 15g of the first inner ring 71a. Thereby, the second inner ring 72a can be attached in a loose fitting manner. In Fig. 3, the first mounting portion 15g is for easy understanding. The difference from the outer diameter of the second mounting portion 15h is depicted to be larger than actual. When the inner diameter of the first inner ring is slightly larger than the second inner ring In the inner diameter, the second mounting portion 15h can be formed to have the same shape as the first mounting portion 15g. The second outer ring 72b is mounted in a tight fitting manner at the second end of the rotor 21 toward the magnet The inner peripheral surface of the holding portion 21b is recessed into the formed second bearing housing portion 21d. In -13-M428893, the second outer ring 72b is fixed to the second bearing housing portion 21d by press fitting. The second outer ring 72b The side surface on the first outer ring 71a side is in contact with the falling portion of the concave portion of the magnet holding portion 21b, and the second outer ring 72b is positioned. The hub shaft 15, the second mounting portion 15h, and the second male screw portion 15b are formed. The portion of the drop portion 15i is located closer to the side of the first bearing 66a than the end surface of the second bearing 66b opposite to the first bearing 66a. The boundary portion 15j of the first mounting portion 15g and the second mounting portion 15h Is located at a side closer to the first bearing 66a than the end surface of the second bearing 66b on the side of the first bearing 66a. The spacer 67 is made of metal disposed between the first inner ring 71a and the second inner ring 72a. a cylindrical member. The spacer 67 has an inner diameter smaller than that of the hub axle 15 The diameter of the portion of the spacer 67 contacting the first inner ring 71a is smaller than the inner diameter of the first outer ring 71b, and the outer diameter of the portion of the spacer 67 contacting the second inner ring 72a. It suffices that it is smaller than the inner diameter of the second outer ring 72b. In this embodiment, the outer diameter of the spacer 67 is smaller than the outer diameters of the first inner ring 71a and the second inner ring 7 2a. The member 67 prevents the movement of the second inner ring 72a of the second bearing 66b attached to the hub axle 15 in the axial direction and the rotational direction by loose fitting. To achieve this, the second lock nut 52 serves as a pressing member. The function is to press the second inner ring 72a toward the first inner ring 71a side. The second lock nut 52, as previously described, is used to secure the housing body 36 to the hub axle. However, when the second lock nut 52 is screwed in, the second lock nut 52 presses the case main body 36, and the first boss portion 36a of the case main body 36 presses the second inner ring 72a. When the second inner ring 72a is pressed to contact the spacer 67, the spacer 67 is not moved further, and the -14-M428893 is pressed by the second lock nut 52 with the second inner ring 72a. Thereby, the movement of the hub inner shaft direction and the rotation direction of the second inner ring 72a is restricted. Therefore, the first inner ring 71a and the second inner ring 72a are less likely to slide on the hub axle 15, and the hub axle 15, the first inner ring 71a, and the second inner ring 72a are less likely to be worn. Here, although the housing main body 36 is in contact with the second inner ring 72a, an annular member may be disposed between the housing main body 36 and the second inner ring 72a, and the housing main body 36 is pressed against the second inner ring via the annular member. 72a » <Rotation transmission mechanism> The rotation transmission mechanism 25, as shown in Fig. 2, is for decelerating the rotation of the rotor 21 and transmitting it to the second casing member 34. The rotation transmitting mechanism 25 accelerates the rotation of the second casing member 34 to the rotor 21 during regenerative braking. The rotation transmitting mechanism 25 has a planetary gear mechanism 48. The planetary gear mechanism 48 is an example of a speed reduction mechanism. The planetary gear mechanism 48 has a sun gear 48a, an internal gear 48b disposed on the outer circumferential side of the sun gear 48a, and meshing with the sun gear 48a and the internal gear 48b. A plurality of (for example, three) planetary gears 48c. The sun gear 48a has a coupling portion 48e for coupling with the rotor 21. The joint portion 48e' is formed, for example, in a cylindrical shape, and has a larger inner diameter than the portion 'having the tooth portion of the sun gear 48. The sun gear 48a is integrally coupled to the magnet holding portion 21b of the rotor 21 by a bolt member 55 attached to the coupling portion 48e. The internal gear 48b is a gear mounting portion 35 that is non-rotatably coupled to the casing body 36. The plurality of planetary gears 48c are rotatably supported by the carrier 48d. Each of the planetary gears 4 8c has two first gear portions 56a and -15-M428893 two gear portions 56b having different numbers of teeth. The first gear portion 56a' meshes with the sun gear 48a, the second gear portion 56b, and meshes with the internal gear 48b. The carrier 48d' is fixed to the inner side surface of the disc portion 34c of the second case member 34. In the planetary gear mechanism 48, since the internal gear 48b provided in the casing main body 36 is non-rotatably fixed to the hub axle 15, the rotation of the sun gear 48a connected to the rotor 21 is decelerated and transmitted to the second casing member. 34. <pressing portion> As shown in Fig. 3, the pressing portion 73 has a first end portion in the rotation axis direction abutting against the sun gear 48a, and a second end portion abutting against the biasing force of the first outer ring 71b. Member 74. The pressing portion 73 further has a first positioning portion 75 that positions the first end side of the biasing member 74 in the diameter direction of the hub axle 15, and a diameter that positions the second end side of the biasing member 74 to the hub shaft 15. The second positioning portion 76 of the direction. The biasing member 74 has a coil spring 74a as a spring member disposed on the outer peripheral side of the hub shaft 15 and fitted between the sun gear 48a and the first outer ring 71b in a compressed state. By the coil spring 74a, it is possible to prevent the first outer ring 71b that is loosely fitted from rattling. The first positioning portion 75 is a cylindrical member disposed on the inner peripheral side of the coupling portion 48e of the sun gear 48a, and has a first flange portion 75a and a first cylindrical portion 75b. The first flange portion 75a extends in the radial direction, and the first flange portion 75a provided to abut against the inner peripheral surface of the connecting portion 48e may be fixed to the inner peripheral surface of the connecting portion 48e. The first cylindrical portion 75b extends from the inner peripheral portion of the first flange portion 75 toward the axial direction of the hub axle, and is disposed on the inner peripheral side of the coil spring 74a to position the coil spring 704a in the radial direction. -16- M428893 The second positioning portion 76' is a cylindrical member having a flange having the same shape as the first positioning portion 75, and has a second flange portion 76a and a second cylindrical portion 76b. The second positioning portion 76 is disposed at an inner peripheral portion of at least one of the rotor 21 and the coupling member 48e. First, the positioning portion 76 is a first bearing housing portion 21c that is movably attached to the magnet holding portion 21b in the direction of the valley axis. The second flange portion 76a abuts against the end surface of the first outer ring 71b. The second flange portion 76a restricts the movement in the radial direction by the first bearing housing portion 21c. The second flange portion 76a may be disposed to be in contact with the first bearing housing portion 21c. The second cylinder portion 76b' extends from the inner peripheral portion of the second flange portion 76 toward the axial direction of the hub axle, and is disposed on the coil spring 74. The coil spring 740a is positioned in the radial direction on the inner peripheral side of a. By the first positioning portion 75 and the second positioning portion 76, even if the rotor 21 rotates and the centrifugal force acts on the biasing member 74, the biasing member 74 is less likely to move in a direction other than the biasing direction, and the elastic pressure is stabilized. When the coil spring 74a is mounted between the sun gear 48a and the magnet holding portion 21b, the coil spring 74a can be prevented from falling off by the first positioning portion 75 and the second positioning portion 76, so that the coil spring 74a can be easily attached. <Assembly sequence of the rotor> When the rotor 21 is assembled to the hub axle 15, the first bearing 66a is first pressed into the first mounting portion 15g of the hub axle 15. When pressed in, the first inner ring 71a is pressed with a suitable jig until the first inner ring 71a of the first bearing 66a is brought into contact with the movement restricting portion 68. The second outer ring 72b of the second bearing 66b is pressed into the second bearing housing portion 21d-17-M428893 of the magnet holding portion 21b of the rotor 21. When this is pushed in, the second inner ring 72b is also pressed with a suitable jig until the second outer ring 72b of the second bearing 66b comes into contact with the wall surface of the second bearing housing portion 21d. When the first bearing 66a is attached to the hub axle 15, and the second bearing 66b is attached to the rotor 21, the spacer 67 is attached to the first inner ring 71a on the outer peripheral side of the hub axle 15. In this state, the rotor 21 to which the second bearing 66b is attached is attached to the hub axle I5. At this time, the first outer ring 71b of the first bearing 66a is fitted into the first bearing housing portion 21c, and the second inner ring 72a of the second bearing 661) is fitted to the outer peripheral surface of the hub axle 15. The first positioning portion 75 and the second positioning portion 76 are attached to the cylindrical connecting portion 48e of the sun gear 48a and the first bearing housing portion 21c of the magnet holding portion 21b, respectively. Then, the coil spring 74a is disposed on the outer peripheral side of the first cylindrical portion 75b of the first positioning portion 75 and the second cylindrical portion 76b of the second positioning portion 76, and the sun gear 48a is fixed to the magnet holding portion 21b by the bolt member 55. . Thereby, the coil spring 74a is compressed, and the first outer ring 7ib is pressed toward the second bearing by the coil spring 74a. By restricting the movement of the first outer ring 71b toward the opposite side of the second bearing 66b, the first outer ring 66a can be prevented from rattling. Therefore, even if the first outer ring 71b of the first bearing 66a is mounted to the rotor 21 in a loose fitting manner, noise can be prevented. Then, the first boss portion 36a of the casing main body 36 to which the stator 22 is attached in advance is engaged with the rotation locking portion 15e of the hub axle 15. Next, the first hub portion 36a is pressed against the second inner ring 72a by screwing the second lock nut 52 into the second male screw portion 15b. After the pressed second inner ring 72a contacts the spacer 67, if the second lock nut 52 is further screwed in, the second inner ring is pressed between the spacer 67 and the first hub portion 36a via the first hub portion 36a. -18- M428893 72a. Thereby, the movement of the second inner ring 72a in the hub axis direction and the rotational direction is restricted. As a result, the wear of the hub axle 15 and the second inner ring 72a can be reduced. <Other Embodiments> The above description is directed to an embodiment of the present invention, and the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the novel concept. φ (a) In the above embodiment, the hub of the built-in motor for the front wheel is disclosed, and the hub of the built-in motor for the rear wheel is also applicable to the present invention. (b) In the above embodiment, the ball bearing is illustrated as a rolling bearing, and the rolling bearing is not limited to a ball bearing. (c) The mechanical structure of the motor 11 is not limited to the above structure. For example, in the above embodiment, the motor of the inner rotor may be a motor of an outer rotor. (d) In the above embodiment, the projection φ of the movement restricting portion 68 is an annular projection integrally formed with the hub axle, and the present invention is not limited thereto. The protrusions may be the same body as the hub axle or different individuals. The protrusions may protrude from the outer peripheral surface to restrict the movement of the first inner ring. For example, a plurality of protrusions may be radially provided. However, the integrally formed annular projection is easy to machine and can reduce the cost. (e) In the above embodiment, the pressing portion 73 is disposed between the sun gear 48a and the first outer ring 71b, and the present invention is not limited thereto. For example, as the pressing portion 73, a coil spring or a -19-M428893 wavy leaf spring whose one end is locked to the inner circumferential surface of the first bearing housing portion 21c and whose other end is in contact with the first outer ring 71b may be disposed. Spring member or elastomer such as rubber. Therefore, the spring member is not limited to the coil spring, and the above-mentioned coil spring or wavy leaf spring may be used. Bamboo shoot-like (tapered) springs can also be used. (f) In the above embodiment, the spring member used as the biasing member for the pressing portion is exemplified, and the pressing member may be any member that can press the first outer ring 71b toward the second bearing 66b. Yes. For example, the female screw portion may be formed on the inner circumferential surface of the first bearing housing portion 21c, and the screw member may be screwed to the female screw portion to press the first outer ring 71b. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view of a hub of a built-in motor according to an embodiment of the present invention. Figure 2 is a cross-sectional view of the hub of the built-in motor. Fig. 3 is an enlarged cross-sectional view showing the rotor supporting portion. [Main component symbol description] I 〇: Built-in motor hub II: Motor 1 5: Hub axle 21: Rotor 22: Stator 48: Planetary gear mechanism 48a: Sun gear 66a: First bearing • 20- M428893 66b: Second Bearing 6 8 : movement restricting portion 6 8 a : annular protrusion
7 1 a :第一內環 71b :第一外環 71c :第一滾動體 72a :第二內環 72b :第二外環 72c :第二滾動體 73 :按壓部 74 :彈壓構件 74a :線圈彈簧 7 5 :第一定位部 7 6 :第二定位部7 1 a : first inner ring 71b : first outer ring 71 c : first rolling body 72 a : second inner ring 72 b : second outer ring 72 c : second rolling body 73 : pressing portion 74 : elastic member 74 a : coil spring 7 5 : first positioning portion 7 6 : second positioning portion