1279354 玖、發明說明： 【發明所屬之技術領域】 本發明是關於電動輔助自行車，更具體的是關於具有依 靠人力進行轉動操作而轉動驅動後輪的曲柄踏板、將作用 於這個曲柄踏板的踏力轉矩傳遞到前述後輪的轉動傳遞機 構和將輔助轉矩傳給這個轉動傳遞機構的輔助動力單元的 電動輔助自行車。 【先前技術】 在自行車上裝備輔助動力單元，將來自被人力蹬踏的曲 柄踏板的踏力轉矩和來自輔助動力單元的輔助轉矩的合力 作用於鏈條上，在這種電動輔助自行車上，為了將這個輔 助動力單元的轉動輸出作為輔助轉矩傳給鏈條，需要在掛 鏈條的部分加上來自輔助動力單元的轉動動力，就需要在 座支柱和在這個座支柱後方的後叉處支撐輔助動力單元。 由此，例如為了將輔助動力單元配置在後叉的下方，而使 用改變了形狀的車體框架，將這個後叉配置在比通常更加 上方的位置，而從座支柱向後延伸，用於搭載輔助動力單 元（例如，參照專利文獻 1 )和將輔助動力單元搭載於座 支柱後方的後叉上方處（例如，專利文獻2 )等。 (專利文獻1 ) 日本專利特開2 0 0 0 — 0 0 2 6 0 4號公報（圖2 ) (專利文獻2 ) 曰本專利特開平1 1 — 1 0 5 7 7 4號公報（第3頁，圖1 ) 【發明内容】 6 312/發明說明書(補件)/92-12/92125190. 1279354 (發明所欲解決之問題） 但是，在使車體框架改變形狀的情況下，則存在需要準 備這種特別的支架而造成電動輔助自行車的成本提高的問 題，另外，在座支柱的後方而且是後叉的上方的位置配置 輔助動力單元的話，則有必須將電池箱和電裝品箱配置在 其他的位置上，而難於有效地利用車體的空間的問題。 本發明有鑒於這樣的問題，目的在於提供可以使用一般 的自行車支架，而且通過將輔助動力單元配置在後叉下 __________________ ,, 方，而可以有效地利用座支柱後方的空間，製造成本低的 電動輔助自行車。 (解決問題之手段） 為了達到這樣的目的，本發明的電動輔助自行車，具有 車體框架、可掌握方向地樞軸連接在該車體框架的前部的 車把架（例如實施形態中的前叉7以及轉向車把8 )、被自 由轉動地安裝在車把架下端的前輪、由與車體框架的後部 連成一體且向後方延伸的左右一對支撐構件組成的後叉、 位於該左右一對支撐構件之間且可自由轉動地安裝在後叉 上的後輪、被樞軸支撐並可自由轉動地安裝在車體框架上 的曲柄踏板、將踩踏該曲柄踏板而作用於該曲柄踏板上的 踏力轉矩傳遞到後輪上的轉動傳遞機構（例如，在實施形 態中由驅動鏈輪2 1、從動鏈輪2 3以及鏈條2 2構成的鏈條 機構）、輔助踏力轉矩並將輔助轉矩傳給轉動傳遞機構的輔 助動力單元，輔助動力單元具有電動機（例如，實施形態 中的電動馬達 1 5 )、將來自該電動機的轉動輸出進行減速 7 312/發明說明書(補件)/92-1刀92125190. 1279354 的減速齒輪機構（例如，實施形態中的減速齒輪組 56)、 將被減速齒輪機構減速的轉動輸出作為輔助轉矩傳遞到轉 動傳遞機構的輔助動力傳遞部（例如，實施形態中的輔助 鏈輪 2 4 )、至少覆蓋了減速齒輪機構的收納構件（例如， 實施形態中的箱 5 0 )，在輔助動力單元配置在後叉的下方 的同時，收納構件具有覆蓋構成減速齒輪機構的大直徑齒 輪且向外部突出的突出部，突出部被配置在左右一對支撐 構件之間。 通過這樣的構成，可以將普通的車支架用於安裝輔助動 力單元的自行車支架，所以可以降低成本。另外，由於將 輔助動力單元配置在後叉下方，所以可以在後叉上方有效 地利用座支柱後方的空間，可在那裏配置電池箱和電裝品 箱等。另外，由於可以將重量大的輔助動力單元配置在下 方，在可以降低重心穩定地行進的同時，由於有曲柄踏板 和鏈條、以及鏈罩等，可以使辅助動力單元不顯眼。 另外，較佳將收納構件的突出部的上部配置在從側面看 與後叉的上面幾乎相等的位置上，通過這樣的構成，可以 進一步降低電動輔助自行車的重心位置。 另外，減速齒輪機構具有與電動機的馬達軸平行地延伸 且被可以自由轉動地配置在收納構件上的第1轉動軸、形 成在該第1轉動軸上且與形成在馬達軸上的1次減速驅動 齒輪相σ齒合的1次減速從動齒輪，在將電動機的馬達軸設 置於曲柄踏板附近的同時，較佳將馬達軸和第1轉動軸配 置成從側面看相對於地面呈近似水平地並列地配置，通過 8 312/發明說明書(補件)/92-12/92125190. 1279354 這樣的構成，可以在確保輔助動力單元的底面距離地 一定高度的同時，確保在第2轉動軸上形成的輔助動 遞部分上構成轉動傳遞機構的捲掛傳遞構件（例如， 形態中的鏈條2 2 )的捲繞角。 另外，減速齒輪機構具有與第1轉動軸平行地延伸 可以自由轉動地配置在收納構件上的第2轉動軸、形 該第2轉動軸上且與在第1轉動軸上形成的2次減速 齒輪相p齒合的2次減速從動齒輪，從側面看第2轉動 配置在第1轉動軸的上方是理想的，通過這樣的構成 以確保輔助動力單元的底面距離地面有一定高度。 【實施方式】 以下，參照附圖對本發明的較佳實施形態進行說明 先使用圖 1以及圖 2對本發明的電動輔助自行車進 明。圖2 ( A )是從左面看的本發明的電動輔助自行車 要部分，圖2 ( B )是在圖2 ( A )中將輔助動力單元 下的情況下的側視圖。但是，在圖2 ( B )中，圖示了 述的輔助鏈輪2 4和惰輪2 5以及支撐這個惰輪2 5的支 件83的一部分。 電動辅助自行車1具有車體框架2，這個車體框架 位於其前部而向上下方向延伸的車頭前管3和從車頭 3向後下方延伸的下降管4、被固定在下降管4的後端 左右延伸的支撐管5 (參照圖5 )、從支撐管5向上方 的座管6組成。在車頭前管3上，向下方延伸的前叉 可以自由轉向地支撐，前輪WF被軸支撐於這個前叉7 312/發明說明書(補件)/92-12/92125190. 面有 力傳 實施 且被 成在 驅動 軸被 ，可 〇首 行說 的主 1 6拆 如後 撐構 2由 前管 而向 立起 7被 的下 9 1279354 端。另外，在前叉7的上端設置連成一體的轉向車把8， 操縱這個轉向車把8即可以操縱被軸支撐在這個前叉7上 的前輪WF。 從支撐管5向後方的一側上配置後叉9，該後叉9具有 與這個支撐管5形成一體而與地面平行那樣呈一直線地向 後方延伸的一對支撐構件9 L、9 R，後輪W R被作為驅動輪 軸支撐在這個左右一對的支撐構件9 L、9 R的後端部之間。 另外，左右一對的樓桿1 0被設置在座管6的上部和兩個支 撐構件9 L、9 R的後部之間。 上端具有車座1 1的座支柱1 2被可以調節車座1 1的上 下位置那樣地裝在座管6上。另外，在座管6的後端部可 以插上和脫開那樣地收納電池B的電池收納箱1 3、電裝品 箱1 4被向下排列地設置在座管6的後端部。然後，在後叉 9的下方，配置具有藉助電裝品箱1 4而由電池B供電的作 為輔助轉矩發生構件的電動馬達1 5的輔助動力單元1 6， 這個輔助動力單元1 6被支撐管5以及支撐構件9 L、9 R所 支撐。 在車體框架2的支撐管5上，同軸貫通這個支撐管5的 曲柄軸1 7被軸支撐，另外，具有被配置在這個曲柄軸1 7 的左端以及右端上而可以自由轉動的踏板的曲柄1 8 L、1 8 R 被分別固定地連接，曲柄軸1 7、曲柄1 8 L、1 8 R以及被裝 在這個曲柄18L、18R上的踏板構成曲柄踏板。這樣，曲柄 1 8 L、1 8 R受到騎電動輔助自行車1的騎車人的踏力而可以 使曲柄軸1 7轉動，這個曲柄軸1 7被可以自由轉動地支撐 10 312/發明說明書(補件)/92-12/92125190. 1279354 在車體框架2上。 在曲柄軸 1 7上，設置依靠後述的動力傳遞裝置傳遞 柄軸1 7的轉動的驅動鏈輪2 1，驅動鏈輪2 1的轉動通過 條2 2被傳遞到後輪W R側的從動鏈輪2 3上。在驅動鏈 21的後方，設置將來自輔助動力單元1 6的輔助轉矩傳 到鏈條2 2上的輔助鏈輪2 4。另外，在輔助鏈輪2 4的後方 設置為了加大鍵條2 2相對於這個輔助鍵輪2 4的捲繞角 惰輪25。 另外，在本實施例中，採用了將踏力轉矩以及輔助轉 從驅動鏈輪2 1和輔助鏈輪2 4通過鏈條2 2傳遞到從動鏈 2 3上的鏈條機構，也可以使用皮帶機構將踏力轉矩以及 助轉矩傳遞到後輪WR上。 接下來，參照圖3以及圖4，對於被裝在曲柄軸1 7上 動力傳遞裝置進行說明。在被固定於下降管4上的支撐 5的兩端順螺紋***蓋板1 9 L、1 9 R。在這個蓋板1 9 L、1 和曲柄軸 1 7上形成的段差之間分別嵌插滾珠軸承 2 0 L 2 0 R。即，滾珠軸承2 0 L、2 0 R承受加在曲柄軸1 7上的推 方向以及徑向的荷重而相對於支撐管5可以自由轉動地 撐曲柄軸1 7。 在曲柄軸1 7上，固定第1單向離合器2 6的内輪2 7。 外，驅動鏈輪2 1通過軸襯2 7 A可以自由轉動地被支撐在 個内輪2 7的外周。驅動鏈輪2 1的推力方向的位置被螺 2 8 A和板2 8 B所限制。 在驅動鏈輪2 1上整體地設置蓋體2 9，在被這些驅動 312/發明說明書(補件)/92-12/92125190. 曲 鏈 輪 遞 的 矩 輪 輔 的 管 9R 、 力 支 另 這 母 鏈 11 1279354 輪2 1和蓋體2 9所包圍的空間内，設置傳遞板3 0。這個傳 遞板3 0與驅動鏈輪2 1同軸，而且在以曲柄軸1 7為軸的轉 動方向上相互可以有預定量的偏移那樣被支撐。 驅動鏈輪2 1跨過傳遞板3 0，形成多個（在此為6個） 窗3 1，在這個窗3 1的内側分別收容壓縮螺旋彈簧3 2。在 驅動鏈輪2 1以及傳遞板3 0之間相互地產生轉動方向的偏 移時，壓縮螺旋彈簧3 2產生相對於偏移的抗力那樣進行作 用。 在傳遞板3 0的襯套的内周形成作為第1單向離合器2 6 的外輪的棘輪齒3 3，這個棘輪齒3 3被内輪2 7所支撐、與 依靠彈簧3 4向放射方向上加力的棘輪爪（在這裏有3個） 相結合，在這個第1單向離合器2 6上設置用於防塵的罩 3 6 ° 通過這樣的第1單向離合器26，踏曲柄18L、18R而使 曲柄軸1 7正轉時，通過彈簧3 4，棘輪爪3 5向棘輪齒3 3 壓靠，所以棘輪爪3 5與棘輪齒3 3的齒底部分相嚙合而曲 柄1 8 L、1 8 R的踏力被傳遞到傳遞板3 0上，但是在踏曲柄 1 8 L、1 8 R而使曲柄軸1 7反轉或者在騎行中停止蹬踏時， 棘輪爪3 5在棘輪齒3 3的齒牙部分滑移而不σ齒合，第1單 向離合器2 6滑移，所以曲柄軸1 7可以反轉，另外，來自 傳遞板3 0的轉矩不會傳遞到曲柄軸1 8 L、1 8 R上。 在傳遞板3 0上，設置後述的傳遞踏力用的突起部3 8所 結合的固定孔3 7。在驅動鏈輪21上，設置可以使突起部 38與固定孔37相結合的窗39，突起部38貫穿這個窗39 12 312/發明說明書(補件)/92-12/92125190. 1279354 與固定孔37相嵌合。 跨過驅動鏈輪2 1和傳遞板3 0，形成與前述窗3 1不同的 另夕卜多個（在此為3個）小窗4 0，在這個小窗4 0的内側 分別收容壓縮螺旋彈簧4 1。壓縮螺旋彈簧4 1是使傳遞板 3 0向轉動方向 4 2 —側壓靠配置的。即，作用於吸收驅動 鏈輪2 1以及傳遞板3 0結合部之間鬆動的方向，傳遞板3 0 的變位被以良好的應答性而傳遞到鏈輪 21 上那樣進行作 用。 因此，曲柄 1 8 L、1 8 R 由於騎車人的蹬踏而加在曲柄軸 1 7上的踏力轉矩被通過第1單向離合器2 6傳遞到傳遞板 3 0上，而這個踏力轉矩一邊壓縮各壓縮螺旋彈簧 3 2、4 1 一邊被傳遞到驅動鏈輪2 1上，再通過鏈條2 2以及從動鏈 輪2 3被傳遞到後輪W R上。並且，從後述的輔助動力單元 1 6給予輔助鏈輪2 4的輔助轉矩，通過鏈條2 2和從動鏈輪 2 3傳遞到後輪W R。另外，從該輔助動力單元1 6給予輔助 鏈輪2 4的輔助轉矩，通過第1單向離合器2 6的作用，不 會被傳遞到曲柄1 8 L、1 8 R上。 在驅動鏈輪21的靠車體側，即下降管 4側裝設踏力檢 測裝置的感測器部4 3。這個感測器部4 3具有固定在驅動 鏈輪2 1上的外側環4 4和可以相對於這個外側環4 4自由轉 動地設置用於形成磁電路的感測器本體4 5。對於感測器本 體4 5以及作為其支撐構件的套管4 6、法蘭盤4 7等，將在 後面敘述。 外側環 4 4是由具有電氣絕緣性能的材料形成的，由未 13 312/發明說明書(補件)/92-12/92125190. 1279354 被圖示的螺栓固定在驅動鏈輪2 1上。 接下來，用圖5〜圖9對輔助動力單元1 6進行說明。輔 助動力單元16的箱50由右半箱體51、在這個右半箱體51 之間形成第1收納室5 4且與右半箱體51相結合的左半箱 體5 2、在這個左半箱體5 2之間形成第2收納室5 5且與左 半箱體5 2相結合的罩5 3構成。 在箱5 0上，安裝具有與曲柄軸1 7的轉動軸線相平行的 軸線的電動馬達1 5。這個電動馬達1 5的轉動輸出應輔助 施加在曲柄18L、18R上的踏力轉矩，藉助輔助減速齒輪組 5 6傳遞到輔助鏈輪2 4上。 在箱50的左半箱體52上，一體地設置向與罩53相反 的一側突出的嵌合筒部74，具有電動馬達15的有底圓筒 形的馬達殼7 5，在被嵌合於嵌合筒部7 4上的狀態下，用 多個（例如3處）螺栓緊固在左半箱體5 2的螺孔7 6内。 另外，馬達軸57可以自由轉動地貫通支撐壁部77而向第 2收納室5 5突出，與支撐壁部7 7相接的馬達殼7 5和馬達 軸5 7之間裝滾珠軸承9 1。另外，馬達殼7 5例如是一體鑄 模形成的。 用於將電動馬達1 5的動力傳遞到輔助鏈輪2 4上的減速 齒輪組5 6的轉動軸是由具有與馬達軸5 7相平行軸線的第 1轉動軸5 9和具有與這個第1轉動軸5 9相平行軸線的第2 轉動軸6 4構成。在第1轉動軸5 9和左半箱體5 2之間裝滾 珠軸承6 9，在右半箱體5 1和第1轉動軸5 9之間裝滾珠軸 承7 0，第1轉動軸5 9被可以自由轉動地配置。另外，在 14 312/發明說明書(補件)/92-12/92125190. 1279354 左半箱體5 2和第2轉動軸6 4之間裝滾珠軸承7 1，在右半 箱體5 1和第2轉動軸6 4之間裝滚珠軸承7 2，第2轉動軸 6 4被可以自由轉動地配置 另外，具備在第2收納室5 5内被固定在電動馬達1 5的 馬達軸5 7上的1次減速驅動齒輪5 8、與在第2收納室5 5 内被螺栓6 0固定在第1轉動軸5 9上並與1次減速驅動齒 輪5 8相喷合的1次減速從動齒輪6 1、在第1收納室5 4内 與第1轉動軸5 9形成一體的2次減速驅動齒輪6 2，在第1 收納室5 4内被固定在第2轉動軸6 4上並與2次減速驅動 齒輪6 2相喷合的2次減速從動齒輪6 3、被設在2次減速 從動齒輪6 3和第2轉動軸6 4之間的第2單向離合器6 5， 輔助鏈輪2 4被固定在從第2轉動軸6 4的右半箱體5 1向外 突出的部分上。另外，密封構件6 6被設在從右半箱體5 1 向第2轉動軸6 4突出的部分。另外，在1次減速從動齒輪 61的 2次減速驅動齒輪6 2 —側的面上，為了加強這個1 次減速從動齒輪61，用螺栓6 8緊固環形的增強板6 7。 另外，在罩48的内側（第2收納室55側）形成多個肋 7 3，而可以提高這個罩4 8的剛性。另外，罩4 8是通過向 成型模内繞樹脂材料而形成的，而通過將罩4 8的内側形狀 作成上述那樣，可以改善在製造罩4 8時樹脂材料的流動。 在這樣的減速齒輪組5 6中，伴隨著電動馬達1 5動作的 轉動被減速後傳遞給輔助鏈輪2 4，在電動馬達1 5的動作 停止時和在驅動鏈輪2 1的轉動比輔助鏈輪2 4的轉動快的 情況下，由於第2單向離合器6 5的作用而允許第2轉動軸 15 312/發明說明書(補件)/92-12/92125190. 1279354 64空轉。而不會妨礙依靠來自曲柄18L、18R的踏力轉矩 而進行的輔助鏈輪2 4的轉動。 但是，輔助動力單元1 6被支撐管5以及支撐構件9 L、 9 R所支撐而被配置在後叉9的下方，在這時，馬達軸5 7 位於在比曲柄軸1 7略微後下方的曲柄踏板的附近，另外， 馬達軸5 7和第1轉動軸5 9從側面看是位於與地面略微平 行地那樣並列的。另外第2轉動軸6 4位於比第1轉動軸 5 9更上方的位置，形成使覆蓋被固定在這個第2轉動軸6 4 上的 2次減速從動齒輪 6 3的箱 5 0的部分突出的突出部 8 4，按照使這個突出部8 4在後輪W R的前方且可從下方插 入左右一對的支撐構件9 L、9 R之間那樣配置輔助動力單元 1 6 〇 這時，在固定於支撐管 5的托架 7 9上，用螺栓和螺母 緊固被向左半箱體 5 2的前方上部的上方***那樣設置的 懸掛部8 0，另外，在被緊固在左右一對的支撐構件9 L、9 R 上的托架8 1 L、8 1 R之間夾著被向後方上部的上方***那樣 設置的懸掛部8 2，其被螺栓和螺母緊固（將懸掛部分8 0、 8 2以及輔助動力單元1 6裝到電動輔助自行車1的狀態， 如圖2 ( A )所示。另外，箱5 0的突出部8 4的上部，從平 面圖的角度上看，是被配置在與後叉9的上面幾乎相同的 位置上。 另外，在第2轉動軸6 4從右半箱體51突出的部分處， 形成向後方延伸的支撐構件8 3，惰輪2 5可以自由轉動那 樣地被軸支撐在這個支撐構件8 3的端部，右半箱體5 1和 16 312/發明說明書(補件)/92-12/92125190. 1279354 惰輪25形成一體。 如以上說明的那樣，使箱5 0的突出部8 4僅蓋住與2次 減速從動齒輪6 3相對的部分那樣而突出即可，所以呈在前 後方向細長延伸的形狀。這樣，即使用普通的自行車支架， 也可以從下方將這個突出部分***構成後叉的左右一對的 支#構件之間，而配置辅助動力裝置1 6，所以不需要準備 特殊的支架，從而可以降低製造成本。另外，通過將重量 大的輔助動力單元16配置在車體框架2的下部，可以降低 重心的位置，而提高行進時的穩定性。另外，由於不在後 叉9的上方而且是座管12的後方空間内配置輔助動力單元 1 6，可以有效地利用這個空間，如在本實施例中說明的那 樣，可以配置電池收納箱1 3和電裝品箱1 4等。 另外，由於輔助動力單元 16的配置位置是在驅動鏈輪 2 1和被掛在那個驅動鏈輪2 1上的鏈條2 2的附近，故可使 這個輔助動力單元1 6的存在不顯眼，特別是用鏈罩蓋上的 話，可以更加不顯眼。 另外，通過將馬達軸5 7和第1轉動軸5 9與地面平行地 那樣並列配置，還將第2轉動轴6 4配置在第1轉動軸5 9 的上方，可以確保輔助動力單元1 6的底面距離地面一定的 高度，另外，可以在一定程度上確保鏈條2 2相對於被固定 在第2轉動軸64上的輔助鏈輪24的捲繞角。 下面，通過圖10〜13說明構成該輔助動力單元16的電 動馬達1 5。電動馬達1 5是通過直流電源驅動的直流無刷 馬達，具有馬達軸57、包圍馬達軸57地配置的定子85、 17 312/發明說明書(補件)/92-12/92125190. 1279354 固定在馬達軸5 7上的轉子8 6以及檢測該轉子位置的轉子 位置檢測器8 7，整體被馬達殼7 5所覆蓋。 定子8 5是通過在定子磁芯8 8上繞定子線圈8 9而構成， 而被沿著馬達殼7 5的内周面設置多個（在此為9個）。另 外，轉子8 6與上述定子8 5相對那樣配置多個（在此為8 個）永久磁鐵9 0，按照N極、S極交替那樣排列與這個永 久磁鐵9 0的定子8 5相對的磁極。這時在定子8 5和轉子 86之間形成一定間隔的空隙。 另外，在馬達軸5 7和馬達殼7 5之間裝滾珠軸承9 1、9 2 而軸支撐這個馬達軸5 7。另外，在馬達殼7 5的側面且為 在馬達軸5 7突出的一側上，形成多個（在此為3個）托架 9 3，螺栓穿過這個托架9 3的貫通孔而將電動馬達1 5固定 在箱5 0上。另外，轉子位置檢測器8 7被按照與轉子8 6 的上面平行和留有所確定的空隙那樣配置，用這個轉子位 置檢測器8 7具有的霍爾元件，檢測出移動到轉子位置檢測 器87下方的轉子86的N極。 被繞在定子磁芯8 8上的定子線圈8 9，按圖1 3所示順序 進行電氣連接，具有3相（U、V、W相）輸入端子9 4。加 在這個輸入端子9 4上的電壓被電裝品箱1 4所具有的控制 裝置所控制而從電池B提供，在輸入端子9 4上加一個相位 各相差1 2 0度的脈衝電壓的話，多個定子8 5的磁極N極、 S極交替出現，而且，定子8 5的磁極對應於這個脈衝的頻 率而移動，這樣，通過電裝品箱1 4而得到用轉子位置檢測 器8 7檢測到的轉子8 6的永久磁鐵9 0的位置，通過根據這 18 3U/發明說明書(補件)/92-12/92125190· 1279354 個永久磁鐵9 0的位置而調整加在定子8 5上脈衝電壓， 以使馬達軸 5 7轉動。另外，通過控制加在這個輸入端 9 4上的脈衝電壓的脈衝波幅的P W Μ控制，可以控制轉子 的轉動速度（電動機的輸出）。 另外，由於這個轉子位置檢測器 8 7檢測出向這個轉 位置檢測器8 7的下方移動的永久磁鐵9 0的Ν極，通過 這個次數，可以從這個Ν極的檢測信號的次數計算出馬 軸5 7的轉數（轉速）。 在以上那樣構成的電動輔助自行車1上，依靠人力， 驅動方向（正轉方向）踏曲柄1 8 L、1 8 R，被固定在曲柄 1 7上的内輪2 7轉動，那個轉動被通過棘輪爪3 5傳遞到 輪齒。然後，使傳遞板3 0轉動，這個轉動被通過壓縮螺 彈簧3 2傳遞到驅動鏈輪2 1上，而由於在驅動鏈輪2 1上 了轉矩，所以傳遞板3 0的轉矩不會被立即傳遞到驅動鏈 2 1上，首先，由於轉矩壓縮螺旋彈簧3 2發生撓變，在 個撓變負荷與轉矩平衡時，驅動鏈輪2 1轉動。這樣，傳 板3 0以及驅動鏈輪2 1以具有與轉矩相對應方向的偏移 狀態進行轉動，通過鏈條2 2給後輪W R以驅動力。加在 動鏈輪2 1上的轉矩被作為騎車人蹬踏曲柄1 8 L、1 8 R的 力，即踏力轉矩而被檢測出。 由於從踏力檢測裝置的感測器本體4 3突出的突起部 與傳遞板3 0同時轉動，所以支撐這個突起部3 8的踏力 遞環95 (以下，與外側環44相對應，而將踏力傳遞環 稱為内側環9 5 )和被固定在驅動鏈輪2 1上的外側環4 4 312/發明說明書(補件)/92-12/92125190. 可 子 86 子 數 達 向 軸 棘 旋 加 輪 這 遞 的 驅 踏 38 傳 95 的 19 1279354 相對位置與轉矩相對應而被決定。這個相對位置被感測器 本體4 3檢測到，而提供給檢測踏力的控制裝置（在後面 述）。 使用圖1 4及圖1 5詳細說明這個感測器本體4 3。用具有 電氣絕緣性能的材料形成外側環4 4，設置3處螺栓孔9 6， 而可以將用於使這個外側環4 4固定在驅動鏈輪2 1上的螺 栓貫通。沿外側環4 4的内周面配置第1感應體9 7 A，還配 置與第1感應體9 7 A相鄰的第2感應體9 7 B。另外，在第2 感應體9 7 B上沿外周面配置内側環9 5。第1感應體9 7 A和 第2感應體9 7 B由鋁和黃銅等的高導電率材料或軟磁材料 構成，如後述的那樣，分別被固定在外側環44以及内側環 9 5上。 夾著第1感應體97A和第2感應體97B設置兩片1組的 環狀磁芯板9 8、9 9，而且在這些磁芯板9 8、9 9的内周側 設置磁芯轴環1 0 0。磁芯板9 8、9 9以及磁芯轴壞1 0 0由軟 鐵氧化物等的軟磁材料組成。線圈1 0 1被繞在磁芯軸環1 0 0 的外周，通過磁芯板9 8、9 9以及磁芯軸環1 0 0，還有第1 感應體9 7 A和第2感應體9 7 B，在向線圈1 0 1通電時產生 的磁通貫通’形成磁電路。磁芯板 9 8、9 9 以及磁芯袖壞 1 0 0，被套管4 6以及具有與這個套管4 6的内紋螺紋相配外 紋螺紋的法蘭盤4 7所支撐。另外，套管4 6以及法蘭盤4 7 被支撐管5所支撐，而限制轉動。 向前述線圈1 0 1供應電流的引出線1 0 4，貫穿套管4 6並 向外部引出，與後述的控制裝置1 1 0相連接。在外側環4 4 20 312/發明說明書(補件)/92-12/92125190. 1279354 和套管4 6之間設置油封1 Ο 5，在外側環4 4和内側環9 5之 間以及内側環9 5和法蘭盤4 7之間，分別設置密封件1 0 6、 1 0 7。按照可以與固定孔3 7相配合那樣，從設在罩4 8上的 開口 4 8 Α向外部突出那樣設置從内側環9 5向直角突出的突 起部38。 圖1 6是第1感應體9 7 A的前視圖，圖17是剖面圖。第 1感應體97A整體為環形，在其内周上形成多個齒108。在 第2感應體97B上也設置與這些齒108相同的齒。通過這 些齒的重疊，形成由線圈1 0 1而產生的磁通的通路的一部 分。在齒1 0 8的兩個地方，.形成從罩形的第1感應體9 7 A 的底部向外突出的突起部1 0 9 A。按照第1感應體9 7 A可以 與外側環4 4 一體地轉動那樣，與在外側環4 4上形成的凹 部嵌合那樣設定突起部1 0 9 A。 圖18是第2感應體97B的剖面圖。第2感應體97B與 第1感應體97A形狀相同。但是，外周要比第1感應體97A 小一圈。另外，如圖1 8所示的那樣，第2感應體9 7 B具有 從帽形的第2感應體9 7 B的底部向外打出的突起部1 0 9 B。 按照在與第2感應體9 7 B相接的内側環9 5上形成的凹部嵌 合那樣設定這個突起部1 0 9 B。 圖1 9是表示由線圈1 0 1產生的磁通貫通的磁電路的模 式圖，在這個圖中，在線圈1 0 1通電時產生的磁通Φ形成 包括磁芯板9 8、9 9以及磁芯軸環1 0 0，還有第1感應體9 7 A 和第2感應體9 7 B的磁電路。這時，磁通Φ的指向，例如 在圖1 9中表示的那樣。在此，線圈1 0 1的阻抗被用磁通Φ 21 312/發明說明書(補件)/92-12/92125190. 1279354 通過的電路的阻抗’即磁電路阻抗的函數表不。另外 通Φ實質地通過設在第1感應體97A以及第2感應體 的内周上的齒（在第1感應體9 7 A上的齒1 0 8 )，所以 部分的磁電路的阻抗由第1感應體9 7 A以及第2感應靡 的各個齒的重叠量所決定。 如上述那樣，外側環4 4和内側環9 5相應於踏力轉 互產生偏移，第1感應體9 7 A以及第2感應體9 7 B的 位置上也隨之產生偏移。其結果是第1感應體9 7 A以 2感應體9 7 B的各個齒的重疊程度也相應於踏力轉矩 化。 圖20是表示根據踏力轉矩的不同第1感應體97A 第2感應體97B所具有的各自的齒的重疊程度不同的 從這些圖可知，在踏力轉矩小的情況下，第1感應體 以及第2感應體9 7 B的重疊程度變大，所以用第1感 9 7 A以及第2感應體9 7 B的齒將通過磁芯板9 8、9 9之 磁通遮擋的比例減小，所以磁電路阻抗變小。另外， 力轉矩大的情況下，第1感應體9 7 A以及第2感應體 的重疊程度變小，所以用第1感應體97A以及第2感 9 7 B 的齒將通過磁芯板 9 8、9 9之間的磁通遮擋的比 力口 ，所以磁電路阻抗變大。 這樣，磁通所通過通路的阻抗對應於踏力轉矩而改 所以通過檢測作為這個磁電路阻抗函數的線圈 101 抗，可以檢測踏力轉矩。 如圖 21所示，根據線圈1 01的阻抗，檢測踏力阻 312/發明說明書(補件)/92-12/92125190. ，磁 97B 這個 ：97B 矩相 相對 及第 而變 以及 圖。 97A M m. 間的 在踏 97B 應體 例增 變 ， 的阻 抗的 22 1279354 控制裝置1 1 0的振盪電路1 1 1、峰值保持電路1 1 2、以及阻 抗1 1 3與線圈1 Ο 1 —起構成這個控制裝置1 1 0的主要部 分。峰值保持電路1 1 2的輸出由C P U 1 1 4處理。振盪電路 1 1 1輸出預定頻率的交流電（在圖2 2 ( A )中表示圖2 1的 點a的波形）。第1感應體97A以及第2感應體97B的各個 齒的重疊程度大的情況下，在線圈1 0 1中產生的磁通Φ的 磁電路阻抗大，所以在點 b的波形的振幅變大（在圖 21 的點b伴隨著踏力增加的波形在圖2 2 ( B )中表示）。點b 的振幅被峰值保持電路Π 2所保持，其峰值保持值，即點 b的值（參照圖2 2 ( C ))被作為踏力轉矩輸入到C P U 1 1 4。 構成輔助動力單元1 6的電動馬達1 5被作為負荷連接在 控制裝置1 1 0上，作為電源連接有電池B。 電動馬達1 5的驅動電路由F E T 1 1 7、二極體 1 1 8、電容 1 1 9所構成。電池B的正電極被通過接點1 2 0接到電動馬 達1 5的正端子上，電池B的負電極被通過F E T 1 1 7接到電 動馬達1 5的負端子上。 接點1 2 0按照C P U 1 1 4的指令，根據線圈1 2 1的通電而 進行Ο N動作。被供到電動馬達1 5上的電流由從C P U 1 1 4 加到F E T 1 1 7的閘極上的電壓所決定。C P U 1 1 4參照對應於 踏力值的踏力轉矩值/電壓表，或者根據預定的計算式進行 計算，而求得與踏力轉矩值對應的電壓值，將這個電壓加 到F E T 1 1 7的閘極上。按照被輸入到C P U 1 1 4的踏力轉矩的 值增大的同時，電動馬達1 5的輸出增大那樣設定踏力轉矩 值/電壓表或者計算式是理想的。 23 312/發明說明書(補件)/92-12/92125190. 1279354 根據本實施形態，例如產生了組裝精度上的偏差而在第 1感應體97A以及第2感應體97B之間，磁芯板98、99的 位置在軸向偏移，第1感應體9 7 A以及磁芯板9 8之間的距 離變窄時，第2感應體9 7 B以及磁芯板9 9之間的距離增 大。與此相反，第1感應體9 7 A以及磁芯板9 8之間的距離 增大時，第2感應體9 7 B以及磁芯板9 9之間的距離縮小。 這樣，一方的間隔變化被另一方的間隔變化所抵銷，作為 整體的磁電路阻抗可以維持一定。 另外，在第1感應體97A以及第2感應體97B之間，磁 芯板 98、99 的位置在半徑方向偏移，在半徑方向的一方 上，第1感應體9 7 A以及第2感應體9 7 B和磁芯板9 8、9 9 的重疊加大時，在半徑方向的另一方上，第1感應體97A 以及第2感應體9 7 B和磁芯板9 8、9 9的重疊變小。因此， 一方磁電路阻抗增大，而在另一方磁電路阻抗減小，結果 是作為整體的磁電路阻抗可以維持一定。 另外，本發明的電動輔助自行車 1，設置限制器，當這 個電動辅助自行車1以超過所規定的速度行進時，不管來 自踏力檢測裝置的輸出如何而使輔助單元停止，不發生輔 助轉矩那樣進行控制，為了檢測出電動輔助自行車1的行 進速度，使用上述電動馬達1 5的轉子位置檢測器8 7檢測 的N極的檢測信號。被固定在電動馬達1 5的轉子8 6上的 永久磁鐵9 0的N極的個數由電動機所決定（在此為4極）， 通過計數從轉子位置檢測器8 7輸出的N極的檢測信號，可 以得到電動馬達1 5的轉數（轉速）。 24 312/發明說明書(補件)/92-12/92125190. 1279354 騎車人踏曲柄 18L、18R而加踏力轉矩時，如上述，電 動馬達1 5被控制電路1 1 0所驅動，從輔助動力單元1 6的 輔助鏈輪2 4向鏈條2 2加輔助轉矩。這時，由於連接著構 成這個辅助動力單元16的第2單向離合器65，電動馬達 15的馬達軸57的轉動和輔助鏈輪24的轉動與減速齒輪組 5 6的齒輪比成比例。這樣，可以從電動馬達1 5的馬達軸 5 7的轉數求得電動輔助自行車1的車速。 另外，騎車人的踏力轉矩加在曲柄 18L、18R上，如車 速增加而超過所規定的速度，則輔助動力單元1 6的電動馬 達 15停止而不加輔助轉矩，但是，由於第 2單向離合器 6 5滑動，不會從鏈條2 2向輔助動力單元1 6加轉矩，輔助 動力單元16不會妨礙曲柄18L、18R引起的曲柄踏板的轉 動。 對於根據車速控制輔助轉矩的限制器，向上述控制裝置 1 1 0傳遞電動馬達1 5的轉子位置檢測器8 7的輸出，可以 在用CPU114計算車速的同時，實現電動馬達15的控制。 另外，在圖2 1中，表示了控制裝置1 1 0控制具有現有的整 流元件的直流馬達的情況，而對於上述那樣的無刷直流馬 達，為了控制直流馬達，而從電池B的輸出生成三相脈衝 電壓並加在電動馬達1 5上而進行對應。 (發明效果） 由以上的說明可知，根據本發明的電動輔助自行車，在 將輔助動力單元配置在後叉的下方的同時通過將覆蓋構成 這個動力單元的減速齒輪機構的大徑齒輪的收納構件的突 312/發明說明書(補件)/92-12/92125190. 25 1279354 出部分從下方***左右一對的 的自行車支架作為裝這個動力 可以降低製造成本。另外，由 叉的下方，所以可以有效地利 的空間，可以配置電池箱和電 量大的輔助動力單元配置在下 穩定地行進的同時由於曲柄踏 使輔助動力單元不顯眼。 另外，從側面看通過將收納 在為與後叉的上面幾乎相等的 可以進一步降低電動輔助自行 進。 另外，具有輔助動力單元的 板近旁的同時，從側面看具有 構的第1轉動軸和電動機的馬 似水平地並列配置，通過這樣 力單元的底面距離地面有一定 助動力單元的輔助動力傳遞部 角。 另外，上述減速齒輪機構具 2轉動軸被配置在第1轉動軸 可以確保輔助動力單元的底面 【圖式簡單說明】 圖1為本發明的電動輔助自 支撐構件之間，可以用普通 單元的自行車的支架，從而 於將輔助動力裝置配置在後 用後叉上方而且是座管後方 裝品箱等。另外，由於將重 方，可以降低重心的位置， 板和鏈條，再有鏈罩等可以 構件的突出部分的上部配置 位置上，通過這樣的構成， 車的重心位置，而穩定地行 電動機的馬達軸被配置在踏 輔助動力單元的減速齒輪機 達軸的位置相對於地面呈近 的構成，可以在確保輔助動 高度，而且可以確保掛在輔 分上的捲掛傳遞構件的捲繞 有第2轉動軸、從側面看第 的上方，通過這樣的構成， 距離地面有一定高度。 行車的側視圖。 26 312/發明說明書(補件)/92-12/92125190. 1279354 圖2為本發明的電動輔助自行車的主要部分的放大圖， 圖2 ( A )是裝了輔助單元的情況下的側視圖，圖2 ( B )是 將輔助單元拆下的情況下的側視圖。 圖3為本發明的電動輔助自行車曲柄軸以及驅動鏈輪附 近的剖面圖。 圖4為圖3沿IV — I V線之剖面圖。 圖5為圖2 ( A )沿V — V線之剖面圖。 圖6為圖2(A)沿V I — V I線之剖面圖。 圖7為圖2 ( A )沿V I I — V I I線之剖面圖。 圖8為左罩半體的側視圖。 圖9為右罩半體的側視圖。 圖1 0為電動馬達的剖面圖。 圖1 1為圖1 0沿X I — X I線之剖面圖。 圖1 2為圖1 0沿X I I - X I I線之剖面圖。 圖1 3為電動馬達定子線圈的配線圖。 圖 1 4為踏力檢測裝置的感測器部分的主要部分的剖面 圖。 圖1 5為踏力檢測裝置的感測器部分的前視圖。 圖16為第1感應體的前視圖。 圖1 7為第2感應體的剖面圖。 圖1 8為第2感應體的剖面圖。 圖 19為表示由線圈產生的磁通所貫通的磁電路的模式 圖。 圖20為表示第1感應體和第2感應體重疊程度的圖， 27 312/發明說明書(補件)/92-12/92125190. 1279354 圖2 Ο ( A )為踏力轉矩小時的圖，圖2 Ο ( B )為踏力轉矩大 時的圖。 圖2 1是控制裝置的踏力檢測電路。 圖2 2為表不線圈的電壓和踏力關係的圖’圖2 2 ( A )疋 在圖21的a點的波形圖，圖2 2 ( B )是在圖21的b點的 波形，圖2 2 ( C )是表示在圖2 1的c點的線圈電壓與踏力 關係的圖。 (元件符號說明） 1 電動輔助自行車 2 車體框架 3 車頭前管 4 下降管 5 支撐管 6 座管 7 前叉 8 轉向車把 9 後叉 9 L、9 R 支撐構件 10 撐桿 11 車座 12 座支柱 13 電池收納箱 14 電裝品箱 15 電動馬達（電動機） 31W發明說明書(補件)/92-12/92125190. 28BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power-assisted bicycle, and more particularly to a crank pedal having a rear wheel that rotationally drives a rear wheel by a manual rotation operation, and a pedaling force acting on the crank pedal The moment is transmitted to the aforementioned rotation transmitting mechanism of the rear wheel and the electric assisted bicycle that transmits the assisting torque to the auxiliary power unit of the rotation transmitting mechanism. [Prior Art] The bicycle is equipped with an auxiliary power unit that applies a resultant force of the pedaling torque from the crank pedal that is manually stepped on and the assist torque from the auxiliary power unit to the chain. The rotation output of the auxiliary power unit is transmitted to the chain as the auxiliary torque, and the rotational power from the auxiliary power unit needs to be added to the part of the hanging chain, and the auxiliary power unit needs to be supported at the seat post and the rear fork behind the seat post. . Thus, for example, in order to arrange the auxiliary power unit below the rear fork, the rear body is disposed at a position higher than usual, and the rear fork is extended rearward from the seat post for mounting assistance. The power unit (for example, refer to Patent Document 1) and the auxiliary power unit are mounted above the rear fork behind the seat post (for example, Patent Document 2). (Patent Document 1) Japanese Patent Laid-Open Publication No. 2000-00-62 (Patent Document 2) (Patent Document 2) Japanese Patent Laid-Open No. 1 1 - 1 0 5 7 7 4 (3rd) Page, Figure 1) [Summary of the Invention] 6 312 / invention manual (supplement) / 92-12 / 92125190. 1279354 (Problem to be Solved by the Invention) However, in the case where the body frame is changed in shape, there is a problem that it is necessary to prepare such a special bracket to increase the cost of the power-assisted bicycle, and in addition, at the rear of the seat pillar When the auxiliary power unit is disposed at a position above the rear fork, it is necessary to arrange the battery case and the electrical component box at other positions, and it is difficult to effectively utilize the space of the vehicle body. The present invention has been made in view of such a problem, and an object thereof is to provide a bicycle bracket that can be used in general, and that the auxiliary power unit can be disposed under the rear fork __________________, so that the space behind the seat post can be effectively utilized, and the manufacturing cost is low. Electric assisted bicycle. (Means for Solving the Problem) In order to achieve such an object, the power-assisted bicycle of the present invention has a vehicle body frame and a handlebar frame pivotally coupled to the front portion of the vehicle body frame (for example, in the front of the embodiment) a fork 7 and a steering handlebar 8), a front wheel that is rotatably attached to the lower end of the handlebar frame, and a rear fork composed of a pair of left and right support members integrally connected to the rear portion of the vehicle body frame and extending rearward a rear wheel rotatably mounted on the rear fork between the pair of support members, a crank pedal pivotally supported and rotatably mounted on the body frame, and the crank pedal is stepped on to act on the crank pedal The upper pedaling torque is transmitted to the rotation transmitting mechanism on the rear wheel (for example, the chain mechanism composed of the driving sprocket 2 1 , the driven sprocket 2 3 and the chain 2 2 in the embodiment), the auxiliary pedaling torque and The auxiliary torque is transmitted to the auxiliary power unit of the rotation transmitting mechanism, and the auxiliary power unit has an electric motor (for example, the electric motor 15 in the embodiment), and outputs the rotation from the electric motor. 7312 deceleration / present specification (s) / the knife 92125190 92-1. The reduction gear mechanism of 1279354 (for example, the reduction gear set 56 in the embodiment) and the rotation output that decelerates the reduction gear mechanism are transmitted as auxiliary torque to the auxiliary power transmission portion of the rotation transmission mechanism (for example, the auxiliary chain in the embodiment) The wheel 2 4) covers at least the housing member of the reduction gear mechanism (for example, the case 50 in the embodiment), and the storage member has a large diameter covering the reduction gear mechanism while the auxiliary power unit is disposed below the rear fork. A protruding portion of the gear and protruding to the outside, the protruding portion being disposed between the pair of right and left support members. With such a configuration, an ordinary bicycle bracket can be used for mounting the bicycle bracket of the auxiliary power unit, so that the cost can be reduced. Further, since the auxiliary power unit is disposed under the rear fork, the space behind the seat post can be effectively utilized above the rear fork, and the battery box, the electrical box, and the like can be disposed there. Further, since the auxiliary power unit having a large weight can be disposed below, the auxiliary power unit can be made inconspicuous due to the fact that the center of gravity can be stably moved while the crank pedal and the chain, the chain cover, and the like are provided. Further, it is preferable that the upper portion of the protruding portion of the housing member is disposed at a position almost equal to the upper surface of the rear fork when viewed from the side, and by such a configuration, the position of the center of gravity of the electric assist bicycle can be further reduced. Further, the reduction gear mechanism has a first rotating shaft that extends in parallel with the motor shaft of the motor and is rotatably disposed on the housing member, and is formed on the first rotating shaft and is decelerated once on the motor shaft. The primary gear of the drive gear phase σ tooth is coupled to the crank gear. The motor shaft and the first rotating shaft are preferably arranged to be approximately horizontal with respect to the ground when viewed from the side while the motor shaft of the motor is disposed near the crank pedal. Parallel configuration, through 8 312 / invention manual (supplement) / 92-12 / 92125190. 1279354 In such a configuration, it is possible to ensure a winding transmission member that constitutes a rotation transmitting mechanism on the auxiliary moving portion formed on the second rotating shaft while ensuring a certain height of the bottom surface of the auxiliary power unit (for example, a chain in a form) 2 2 ) The winding angle. Further, the reduction gear mechanism has a second rotation shaft that is rotatably disposed in parallel with the first rotation shaft and that is disposed on the storage member, and a second reduction gear that is formed on the second rotation shaft and that is formed on the first rotation shaft. It is preferable that the second decelerating driven gear of the phase p-coupling is disposed above the first rotating shaft as viewed from the side, and such a configuration ensures that the bottom surface of the auxiliary power unit has a certain height from the ground. [Embodiment] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. First, the electric assist bicycle of the present invention will be described with reference to Figs. 1 and 2 . Fig. 2 (A) is a portion of the power-assisted bicycle of the present invention seen from the left side, and Fig. 2 (B) is a side view of the case where the auxiliary power unit is placed in Fig. 2 (A). However, in Fig. 2(B), the auxiliary sprocket 24 and the idler 25 and the portion of the support 83 supporting the idler 25 are illustrated. The electric assist bicycle 1 has a vehicle body frame 2, and the front body portion 3 of the vehicle body frame which is located at the front portion thereof and extends upward and downward, and the down pipe 4 extending rearward and downward from the front side 3 are fixed to the rear end of the down pipe 4 The extended support tube 5 (see Fig. 5) and the support tube 5 are formed upward from the seat tube 6. On the front tube 3 of the front, the front fork extending downward is freely steerable, and the front wheel WF is supported by the front fork 7 312 / invention manual (supplement) / 92-12 / 92125190. The surface is force-transmitted and is formed on the drive shaft. The main 16 can be dismantled as the rear support 2 is raised from the front tube to the lower 9 1279354 end of the 7-way. Further, an integrated steering handlebar 8 is provided at the upper end of the front fork 7, and the steering handlebar 8 is manipulated to manipulate the front wheel WF supported by the axle 7 on the front fork 7. A rear fork 9 is disposed on a rear side from the support pipe 5, and the rear fork 9 has a pair of support members 9 L, 9 R extending integrally with the support pipe 5 so as to be parallel to the ground. The wheel WR is supported as a drive axle between the rear end portions of the pair of left and right support members 9 L, 9 R. Further, a pair of left and right floor bars 10 are provided between the upper portion of the seat tube 6 and the rear portions of the two support members 9 L, 9 R . The seat post 12 having the seat 1 1 at the upper end is attached to the seat tube 6 so that the upper and lower positions of the seat 1 1 can be adjusted. Further, the battery storage case 13 and the electrical component box 14 in which the battery B is housed in the rear end portion of the seat tube 6 can be inserted and detached, and the electrical component box 14 is disposed downward at the rear end portion of the seat tube 6. Then, below the rear fork 9, an auxiliary power unit 16 having an electric motor 15 as an assist torque generating member that is powered by the battery B via the electric component box 14 is disposed, and this auxiliary power unit 16 is supported. The tube 5 and the support members 9 L, 9 R are supported. On the support tube 5 of the vehicle body frame 2, the crank shaft 17 coaxially penetrating the support tube 5 is axially supported, and further, has a crank which is disposed on the left end and the right end of the crank shaft 17 and is freely rotatable. 1 8 L, 1 8 R are fixedly connected, respectively, and the crank shaft 17 , the crank 18 8 L, 1 8 R, and the pedals mounted on the cranks 18L, 18R constitute a crank pedal. Thus, the cranks 18L, 18R are subjected to the pedaling force of the rider riding the power-assisted bicycle 1, and the crankshaft 17 can be rotated. This crankshaft 17 is rotatably supported. 10 312/Invention Manual (Repair ) /92-12/92125190. 1279354 on the body frame 2. On the crankshaft 17 , a drive sprocket 2 that transmits the rotation of the arbor 17 by means of a power transmission device to be described later is provided, and the rotation of the drive sprocket 2 1 is transmitted to the driven chain on the side of the rear wheel WR through the strip 2 2 . Wheel 2 3 on. Behind the drive chain 21, an auxiliary sprocket 24 that transmits the assist torque from the auxiliary power unit 16 to the chain 2 2 is provided. Further, a winding angle idler 25 for increasing the key strip 2 2 with respect to the auxiliary key wheel 2 4 is provided behind the auxiliary sprocket 24 . Further, in the present embodiment, a chain mechanism that transmits the pedaling torque and the auxiliary rotation from the drive sprocket 21 and the auxiliary sprocket 24 through the chain 22 to the driven chain 2 is employed, and a belt mechanism may be used. The pedaling torque and the assist torque are transmitted to the rear wheel WR. Next, a power transmission device mounted on the crankshaft 17 will be described with reference to Figs. 3 and 4 . The cover plates 1 9 L, 19 R are inserted into the ends of the support 5 fixed to the downcomer 4 in a threaded manner. A ball bearing 20 L 2 0 R is inserted between the step formed on the cover plate 9 9 L, 1 and the crank shaft 17 respectively. Namely, the ball bearings 20 L and 20 R are subjected to the thrust direction and the radial load applied to the crankshaft 17 and are rotatably supported by the crankshaft 17 with respect to the support tube 5. The inner wheel 27 of the first one-way clutch 26 is fixed to the crankshaft 17. Further, the drive sprocket 2 1 is rotatably supported by the outer circumference of the inner wheel 27 via the bushing 2 7 A. The position of the driving sprocket 2 1 in the thrust direction is limited by the screw 28 A and the plate 2 8 B. The cover body 2 is integrally provided on the drive sprocket 2 1 in these drives 312 / invention manual (supplement) / 92-12 / 92125190. A transfer plate 30 is provided in a space surrounded by a torque wheel auxiliary tube 9R, a force branch, and a parent chain 11 1279354 wheel 2 1 and a cover body 2 9 . This transfer plate 30 is coaxial with the drive sprocket 2 1 and is supported by a predetermined amount of offset from each other in the rotational direction about the crank shaft 17 as an axis. The drive sprocket 2 1 spans the transfer plate 30 to form a plurality of (here, six) windows 3 1, and accommodates the compression coil springs 3 2 on the inner side of this window 31. When the deflection of the rotational direction is generated between the drive sprocket 2 1 and the transmission plate 30, the compression coil spring 3 2 acts as a resistance against the offset. A ratchet tooth 3 3 as an outer wheel of the first one-way clutch 26 is formed on the inner circumference of the bush of the transmission plate 30. This ratchet tooth 3 3 is supported by the inner wheel 27 and is added to the radial direction by the spring 34. The ratchet claws (three in this case) are combined, and a cover for dustproofing is provided on the first one-way clutch 26, and the first one-way clutch 26 is passed, and the cranks 18L and 18R are stepped on. When the crankshaft 17 is rotated forward, the ratchet pawl 35 is pressed against the ratchet teeth 3 3 by the spring 34, so the ratchet pawl 35 engages with the tooth bottom portion of the ratchet tooth 3 3 and the crank is 18 L, 1 8 R The pedaling force is transmitted to the transmission plate 30, but the ratchet pawl 3 5 is at the tooth of the ratchet tooth 3 3 when the crank lever 1 8 L, 1 8 R is used to reverse the crank shaft 17 or the pedaling is stopped during riding. The tooth portion slips without σ tooth engagement, and the first one-way clutch 26 slips, so the crank shaft 17 can be reversed, and the torque from the transmission plate 30 is not transmitted to the crank shaft 18 L, 1 8 R. The transmission plate 30 is provided with a fixing hole 37 to which a projection portion 38 for transmitting a pedaling force to be described later is coupled. On the drive sprocket 21, a window 39 is provided which can engage the projection 38 with the fixing hole 37, and the projection 38 extends through the window 39 12 312 / invention specification (supplement) / 92-12 / 92125190. 1279354 is fitted to the fixing hole 37. Across the drive sprocket 2 1 and the transfer plate 30, a plurality of (here, three) small windows 40 different from the aforementioned window 3 1 are formed, and the compression spirals are respectively accommodated inside the small windows 40 Spring 4 1. The compression coil spring 41 is disposed such that the transmission plate 30 is pressed against the side in the rotational direction 4 2 . That is, in the direction in which the absorption drive sprocket 2 1 and the transmission plate 30 are loosened, the displacement of the transmission plate 30 is transmitted to the sprocket 21 with good responsiveness. Therefore, the crank torque of the cranks 18 L, 18 8 applied to the crankshaft 17 due to the pedaling of the rider is transmitted to the transmission plate 30 through the first one-way clutch 26, and this pedaling force is turned The moment is compressed while the compression coil springs 3 2, 4 1 are transmitted to the drive sprocket 2 1 , and then transmitted to the rear wheel WR through the chain 2 2 and the driven sprocket 2 3 . Further, the assist torque supplied to the auxiliary sprocket 24 from the auxiliary power unit 16 to be described later is transmitted to the rear wheel W R through the chain 2 2 and the driven sprocket 2 3 . Further, the assist torque given to the auxiliary sprocket 24 from the auxiliary power unit 16 is not transmitted to the cranks 18 L and 18 R by the action of the first one-way clutch 26. The sensor portion 43 of the pedaling force detecting device is attached to the vehicle body side of the drive sprocket 21, that is, on the down tube 4 side. This sensor portion 43 has an outer ring 44 fixed to the drive sprocket 21 and a sensor body 45 which is rotatably disposed relative to this outer ring 44 for forming a magnetic circuit. The sensor body 45 and the sleeve 46 as its supporting member, the flange 47 and the like will be described later. The outer ring 4 4 is formed of a material having electrical insulating properties, not by 13 312 / invention specification (supplement) / 92-12 / 92125190. 1279354 The bolts shown are fixed to the drive sprocket 2 1 . Next, the auxiliary power unit 16 will be described with reference to Figs. 5 to 9 . The box 50 of the auxiliary power unit 16 is composed of a right half case 51, a left storage case 5 which forms a first storage chamber 54 between the right half case 51, and is coupled to the right half case 51. A cover 5 3 is formed between the half cases 52 and the second storage case 5 5 and is coupled to the left half case 52. On the tank 50, an electric motor 15 having an axis parallel to the rotational axis of the crankshaft 17 is mounted. The rotational output of this electric motor 15 assists the pedaling torque applied to the cranks 18L, 18R and is transmitted to the auxiliary sprocket 24 by means of the auxiliary reduction gear set 56. In the left half case 52 of the case 50, a fitting cylindrical portion 74 that protrudes toward the side opposite to the cover 53 is integrally provided, and a bottomed cylindrical motor case 75 having an electric motor 15 is fitted. In the state of the fitting tubular portion 74, a plurality of (for example, three) bolts are fastened in the screw holes 7 6 of the left half case 52. Further, the motor shaft 57 is rotatably inserted through the support wall portion 77 to protrude into the second housing chamber 55, and the ball bearing 9 1 is mounted between the motor case 75 and the motor shaft 57 which are in contact with the support wall portion 7 7 . Further, the motor case 75 is formed, for example, by integral molding. The rotating shaft of the reduction gear set 56 for transmitting the power of the electric motor 15 to the auxiliary sprocket 24 is a first rotating shaft 59 having an axis parallel to the motor shaft 57 and has the first The second rotating shaft 64 of the parallel axis of the rotating shaft 59 is formed. A ball bearing 6 is mounted between the first rotating shaft 5 9 and the left half case 5 2 , and a ball bearing 70 is mounted between the right half case 5 1 and the first rotating shaft 5 9 , and the first rotating shaft 5 9 It can be configured to rotate freely. In addition, in 14 312 / invention manual (supplement) / 92-12/92125190. 1279354 A ball bearing 7 is mounted between the left half case 5 2 and the second rotating shaft 64, and a ball bearing 7 2 is mounted between the right half case 5 1 and the second rotating shaft 64. The second rotating shaft 6 4 The first reduction drive gear 58 that is fixed to the motor shaft 57 of the electric motor 15 in the second storage chamber 55 and the bolt in the second storage chamber 5 5 are disposed so as to be rotatable. The primary deceleration driven gear 6 1 fixed to the first rotating shaft 5 9 and being sprayed with the primary reduction drive gear 58 is integrated with the first rotating shaft 59 in the first housing chamber 5 4 . The second reduction drive gear 6 2 is fixed to the second rotating shaft 64 in the first housing chamber 54 and is driven by the secondary reduction drive gear 6 2 twice. The second one-way clutch 6 5 is provided between the decelerating driven gear 6 3 and the second rotating shaft 64, and the auxiliary sprocket 24 is fixed to the right half case 5 1 from the second rotating shaft 64. On the outwardly protruding part. Further, the sealing member 66 is provided at a portion that protrudes from the right half case 5 1 toward the second rotation shaft 64. Further, in order to reinforce the primary decelerating driven gear 61 on the surface of the secondary reduction drive gear 6 2 on the secondary reduction driven gear 61 once, the annular reinforcing plate 6 7 is fastened by bolts 6 8 . Further, a plurality of ribs 7 3 are formed on the inner side of the cover 48 (on the side of the second storage chamber 55), and the rigidity of the cover 48 can be improved. Further, the cover 48 is formed by winding a resin material into the molding die, and by making the inner shape of the cover 48 as described above, the flow of the resin material at the time of manufacturing the cover 48 can be improved. In such a reduction gear set 56, the rotation of the electric motor 15 is decelerated and transmitted to the auxiliary sprocket 24, and the rotation of the electric motor 15 is stopped and the rotation of the drive sprocket 2 is assisted. When the rotation of the sprocket 24 is fast, the second rotary shaft 15 312/invention specification (supplement)/92-12/92125190 is allowed due to the action of the second one-way clutch 65. 1279354 64 idling. The rotation of the auxiliary sprocket 24 by the pedaling torques from the cranks 18L and 18R is not hindered. However, the auxiliary power unit 16 is supported by the support tube 5 and the support members 9 L, 9 R and disposed below the rear fork 9, at which time the motor shaft 57 is located at a crank slightly below and below the crank shaft 17. In the vicinity of the pedal, in addition, the motor shaft 57 and the first rotating shaft 59 are juxtaposed in a direction slightly parallel to the ground as viewed from the side. Further, the second rotating shaft 64 is located above the first rotating shaft 59, and is formed to partially protrude from the case 50 of the secondary decelerating driven gear 6 3 that is fixed to the second rotating shaft 64. In the protruding portion 84, the auxiliary power unit 16 is disposed such that the protruding portion 84 is disposed in front of the rear wheel WR and can be inserted between the pair of right and left support members 9 L, 9 R from below. The bracket 7 of the support tube 5 is fastened with a bolt and a nut to the suspension portion 80 which is provided to the upper portion of the front upper portion of the left half case 52, and is fastened to the left and right pair of supports. The brackets 8 1 L and 8 1 R on the members 9 L and 9 R sandwich a suspension portion 8 2 which is provided to be raised upward toward the upper rear portion, and is fastened by bolts and nuts (the hanging portion 80, 8 2 and the state in which the auxiliary power unit 16 is attached to the power-assisted bicycle 1, as shown in Fig. 2(A). In addition, the upper portion of the protruding portion 84 of the box 50 is arranged in a plan view. At almost the same position as the upper surface of the rear fork 9. In addition, the second rotating shaft 64 protrudes from the right half case 51. At the portion, a support member 83 extending rearward is formed, and the idler pulley 25 is rotatably supported at the end of the support member 83, and the right half case 5 1 and 16 312 / invention manual Pieces) /92-12/92125190. 1279354 The idler 25 is integrated. As described above, the protruding portion 84 of the case 50 can be protruded only by covering the portion facing the secondary decelerating driven gear 63, and therefore has a shape elongated in the front-rear direction. Thus, even if an ordinary bicycle bracket is used, this protruding portion can be inserted from below to form a pair of left and right support members, and the auxiliary power unit 1 6 is disposed, so that it is not necessary to prepare a special bracket, so that Reduce manufacturing costs. Further, by arranging the auxiliary power unit 16 having a large weight in the lower portion of the vehicle body frame 2, the position of the center of gravity can be lowered, and the stability during traveling can be improved. In addition, since the auxiliary power unit 16 is disposed not above the rear fork 9 and in the rear space of the seat tube 12, this space can be effectively utilized, and as explained in the embodiment, the battery storage box 13 can be configured. Electric box 1 and so on. In addition, since the arrangement position of the auxiliary power unit 16 is in the vicinity of the drive sprocket 21 and the chain 2 2 hung on the drive sprocket 21, the presence of the auxiliary power unit 16 can be made inconspicuous, in particular If it is covered with a chain cover, it can be more inconspicuous. Further, by arranging the motor shaft 57 and the first rotating shaft 59 in parallel with the ground, the second rotating shaft 6 4 is disposed above the first rotating shaft 5 9 to secure the auxiliary power unit 16 The bottom surface is at a certain height from the ground, and the winding angle of the chain 2 2 with respect to the auxiliary sprocket 24 fixed to the second rotating shaft 64 can be ensured to some extent. Next, the electric motor 15 constituting the auxiliary power unit 16 will be described with reference to Figs. The electric motor 15 is a DC brushless motor driven by a DC power source, and has a motor shaft 57 and stators 85, 17 312 arranged around the motor shaft 57/invention specification (supplement)/92-12/92125190. 1279354 The rotor 86 fixed to the motor shaft 57 and the rotor position detector 807 for detecting the position of the rotor are entirely covered by the motor casing 75. The stator 85 is formed by winding the stator coils 8 9 on the stator cores 8 and is provided along the inner peripheral surface of the motor casing 75 (here, nine). Further, a plurality of (here, eight) permanent magnets 90 are disposed opposite to the stator 85, and the magnetic poles opposed to the stators 85 of the permanent magnets 90 are arranged alternately in accordance with the N poles and the S poles. At this time, a space is formed between the stator 85 and the rotor 86 at a certain interval. Further, a ball bearing 9 1 , 9 2 is mounted between the motor shaft 57 and the motor case 75 to axially support the motor shaft 57. Further, on the side of the motor case 75 and on the side on which the motor shaft 57 protrudes, a plurality of (here, three) brackets 9 3 are formed, through which the bolt passes through the through hole of the bracket 9 3 The electric motor 15 is fixed to the tank 50. Further, the rotor position detector 87 is disposed in parallel with the upper surface of the rotor 86 and with a defined gap, and the Hall element of the rotor position detector 87 is detected to move to the rotor position detector 87. The N pole of the rotor 86 below. The stator coils 8 9 wound around the stator core 8 8 are electrically connected in the order shown in Fig. 13. There are three-phase (U, V, W phase) input terminals 94. The voltage applied to this input terminal 94 is controlled by the control device of the electrical component box 14 and supplied from the battery B. When a pulse voltage having a phase difference of 120 degrees is applied to the input terminal 94, The magnetic poles N and S of the plurality of stators 8 5 alternately appear, and the magnetic poles of the stator 85 move corresponding to the frequency of the pulse, so that the rotor position detector 87 is detected by the electrical component box 14. The position of the permanent magnet 90 of the rotor 86 is adjusted by adjusting the pulse voltage applied to the stator 85 according to the position of the 18 3U/invention specification (supplement)/92-12/92125190·1279354 permanent magnets 90. , to rotate the motor shaft 57. Further, by controlling the P W Μ control of the pulse amplitude of the pulse voltage applied to this input terminal 94, the rotational speed of the rotor (output of the motor) can be controlled. Further, since the rotor position detector 81 detects the drain of the permanent magnet 90 moving to the lower side of the rotational position detector 87, the number of times the detection signal of the drain can be calculated from this number of times. The number of revolutions (speed). In the power-assisted bicycle 1 configured as described above, the cranks 18 L, 18 R are driven in the driving direction (forward rotation direction) by the manpower, and the inner wheels 27 fixed to the cranks 17 are rotated, and the rotation is passed through the ratchet claws. 3 5 is passed to the teeth. Then, the transmission plate 30 is rotated, and this rotation is transmitted to the drive sprocket 21 by the compression coil spring 32, and the torque of the transmission plate 30 is not due to the torque on the drive sprocket 2 1. Immediately transmitted to the drive chain 21, first, since the torque compression coil spring 3 2 is deflected, the drive sprocket 2 1 rotates when the flexural load and the torque balance. Thus, the transfer plate 30 and the drive sprocket 2 1 are rotated in an offset state having a direction corresponding to the torque, and the drive force is applied to the rear wheel W R through the chain 2 2 . The torque applied to the movable sprocket 2 1 is detected as the pedaling force of the rider pedaling levers 18 L and 18 R, i.e., the pedaling torque. Since the protrusion protruding from the sensor body 43 of the pedaling force detecting device simultaneously rotates with the transmission plate 30, the pedaling force ring 95 supporting this protrusion portion 38 (hereinafter, corresponding to the outer ring 44, and the pedaling force is transmitted) The ring is referred to as the inner ring 9 5 ) and the outer ring 4 4 312 is fixed to the drive sprocket 2 1 / invention specification (supplement) / 92-12 / 92125190. The number of sub-segments can be determined by the corresponding position and torque corresponding to the torque of the steering wheel of the shaft. This relative position is detected by the sensor body 43 and supplied to a control device (described later) for detecting the pedaling force. This sensor body 43 is explained in detail using FIG. 14 and FIG. The outer ring 44 is formed of a material having electrical insulating properties, and three bolt holes 96 are provided, and the bolt for fixing the outer ring 44 to the drive sprocket 21 can be penetrated. The first inductor 9 7 A is disposed along the inner peripheral surface of the outer ring 44, and the second inductor 9 7B adjacent to the first inductor 975A is disposed. Further, the inner ring 9 is disposed on the outer peripheral surface of the second inductor 197B. The first inductor 9 7 A and the second inductor 9 7 B are made of a high-conductivity material such as aluminum or brass or a soft magnetic material, and are fixed to the outer ring 44 and the inner ring 975 as will be described later. Two sets of annular core plates 9 8 and 9 9 are disposed between the first inductor 97A and the second inductor 97B, and magnetic core collars are provided on the inner peripheral sides of the core plates 98 and 909. 1 0 0. The magnetic core plates 9 8 and 9 9 and the core shaft bad 100 are composed of a soft magnetic material such as soft iron oxide. The coil 1 0 1 is wound around the outer circumference of the core collar 1 0 0 , passes through the core plates 9 8 , 9 9 and the core collar 1 0 0 , and also has the first inductor 9 7 A and the second inductor 9 7 B, the magnetic flux generated when the coil 10 1 is energized penetrates to form a magnetic circuit. The core plates 9 8 and 9 9 and the core sleeves are broken 100, supported by a sleeve 46 and a flange 47 having an outer thread that matches the inner thread of the sleeve 46. In addition, the sleeve 46 and the flange 47 are supported by the support tube 5 to restrict rotation. The lead wire 104 that supplies current to the coil 1 0 1 passes through the sleeve 46 and is taken out to the outside, and is connected to a control device 1 10 0 to be described later. On the outer ring 4 4 20 312 / invention manual (supplement) / 92-12 / 92125190. An oil seal 1 Ο 5 is disposed between the 1279354 and the sleeve 4 6 , and between the outer ring 44 4 and the inner ring 9 5 and between the inner ring 9 5 and the flange 47, seals 10 6 , 1 0 are respectively disposed. 7. The projecting portion 38 projecting from the inner ring 915 to the right angle is provided so as to be able to protrude from the opening 4 8 设 provided on the cover 48 as it is fitted to the fixing hole 37. Fig. 16 is a front view of the first inductor 97A, and Fig. 17 is a cross-sectional view. The first inductor 97A has a ring shape as a whole, and a plurality of teeth 108 are formed on the inner circumference thereof. The same teeth as these teeth 108 are also provided on the second inductor 97B. By the overlap of these teeth, a part of the path of the magnetic flux generated by the coil 101 is formed. In two places of the tooth 1 0 8 , A projection 1 0 9 A projecting outward from the bottom of the cover-shaped first inductor 759A is formed. The projection portion 1 0 9 A is set so that the first inductor 197 A can rotate integrally with the outer ring 4 4 so as to be fitted to the recess formed in the outer ring 44. FIG. 18 is a cross-sectional view of the second inductor 97B. The second inductor 97B has the same shape as the first inductor 97A. However, the outer circumference is smaller than the first inductor 97A. Further, as shown in Fig. 18, the second inductor 197B has a projection 1 0 9 B which is ejected outward from the bottom of the hat-shaped second inductor 795B. This projection 1 0 9 B is set in accordance with the recess formed in the inner ring 905 which is in contact with the second inductor 975B. Figure 19 is a schematic view showing a magnetic circuit through which the magnetic flux generated by the coil 101 is penetrated. In this figure, the magnetic flux Φ generated when the coil 110 is energized is formed to include the magnetic core plates 98, 99 and The magnetic core collar 100 has a magnetic circuit of a first inductor 9 7 A and a second inductor 9 7 B. At this time, the direction of the magnetic flux Φ is, for example, as shown in Fig. 19. Here, the impedance of the coil 1 0 1 is used for the magnetic flux Φ 21 312 / invention specification (supplement) / 92-12 / 92125190. 1279354 The impedance of the passed circuit' is a function of the impedance of the magnetic circuit. Further, the pass Φ substantially passes through the teeth provided on the inner circumference of the first inductor 97A and the second inductor (the teeth 1 0 8 on the first inductor 9 7 A), so that the impedance of the partial magnetic circuit is 1 The amount of overlap of each of the teeth of the inductor 9 7 A and the second inductor is determined. As described above, the outer ring 44 and the inner ring 905 are shifted in accordance with the pedaling force, and the positions of the first inductor 197A and the second inductor 197B are also shifted. As a result, the degree of overlap of the respective teeth of the first inductor 9 7 A with the 2 inductors 9 7 B also corresponds to the pedaling torque. 20 is a view showing the degree of overlap of the respective teeth of the first inductor 97A in the second inductor 97B according to the difference in the pedaling torque. As is apparent from the figures, when the pedaling torque is small, the first inductor and the first inductor are Since the degree of overlap of the second inductors 9 7 B is increased, the ratio of the teeth of the first core 9 7 A and the second inductor 9 7 B to the magnetic fluxes passing through the core plates 9 8 and 9 9 is reduced. Therefore, the impedance of the magnetic circuit becomes small. Further, when the force torque is large, the degree of overlap between the first inductor 9 7 A and the second inductor is reduced, so that the teeth of the first inductor 97A and the second inductor 9 7 B pass through the core plate 9 The magnetic flux between 8, 9 and 9 occludes the specific force port, so the magnetic circuit impedance becomes larger. Thus, the impedance of the passage through which the magnetic flux passes is changed in accordance with the pedaling torque, so that the pedaling torque can be detected by detecting the impedance of the coil 101 as a function of the impedance of the magnetic circuit. As shown in Fig. 21, according to the impedance of the coil 101, the pedaling resistance 312/invention specification (supplement)/92-12/92125190 is detected. , Magnetic 97B This: 97B phase relative and the first change and the figure. 97A M m. In the case of step 97B, the impedance of the circuit is increased. 22 1279354 The oscillation circuit 1 1 1 of the control device 1 10, the peak hold circuit 1 1 2, and the impedance 1 1 3 together with the coil 1 Ο 1 constitute the control device. The main part of 1 1 0. The output of the peak hold circuit 1 12 is processed by C P U 1 1 4 . The oscillation circuit 1 1 1 outputs an alternating current of a predetermined frequency (the waveform of the point a of Fig. 21 is shown in Fig. 2 2 (A)). When the degree of superposition of the respective teeth of the first inductor 97A and the second inductor 97B is large, the magnetic circuit impedance of the magnetic flux Φ generated in the coil 101 is large, so that the amplitude of the waveform at the point b becomes large ( The waveform accompanying the increase in the pedaling force at the point b in Fig. 21 is shown in Fig. 2 2 (B). The amplitude of the point b is held by the peak hold circuit Π 2, and the peak hold value, that is, the value of the point b (refer to Fig. 2 2 (C)) is input as the pedaling torque to C P U 1 1 4 . The electric motor 15 constituting the auxiliary power unit 16 is connected to the control device 1 10 as a load, and the battery B is connected as a power source. The drive circuit of the electric motor 15 is composed of F E T 1 17 , diode 1 18, and capacitor 1 19 . The positive electrode of the battery B is connected to the positive terminal of the electric motor 15 through the contact 120, and the negative electrode of the battery B is connected to the negative terminal of the electric motor 15 through F E T 1 17 . The contact 1 2 0 performs the Ο N operation in accordance with the energization of the coil 1 2 1 in accordance with the instruction of C P U 1 1 4 . The current supplied to the electric motor 15 is determined by the voltage applied from the C P U 1 1 4 to the gate of the F E T 1 1 7 . The CPU 1 14 refers to the pedaling force torque value/voltmeter corresponding to the pedaling force value, or calculates according to a predetermined calculation formula, and obtains a voltage value corresponding to the pedaling torque value, and applies this voltage to the FET 1 17 On the gate. It is preferable to set the pedaling torque value/voltmeter or calculation formula so that the value of the pedaling torque input to C P U 1 14 is increased while the output of the electric motor 15 is increased. 23 312 / invention manual (supplement) / 92-12 / 92125190. 1279354 According to the present embodiment, for example, a variation in assembly accuracy occurs, and the positions of the core plates 98 and 99 are shifted in the axial direction between the first inductor 97A and the second inductor 97B, and the first inductor 9 7 When the distance between A and the core plate 98 is narrowed, the distance between the second inductor 9 7 B and the core plate 9 9 is increased. On the other hand, when the distance between the first inductor 9 7 A and the core plate 98 is increased, the distance between the second inductor 9 7 B and the core plate 9 9 is reduced. Thus, the change in one interval is offset by the change in the interval between the other, and the impedance of the magnetic circuit as a whole can be maintained constant. Further, between the first inductor 97A and the second inductor 97B, the positions of the core plates 98 and 99 are shifted in the radial direction, and the first inductor 9 7 A and the second inductor are located on one side in the radial direction. When the overlap of the 9 7 B and the core plates 9 8 and 9 9 is increased, the overlap of the first inductor 97A and the second inductor 9 7 B and the core plates 98, 9 9 on the other side in the radial direction Become smaller. Therefore, the impedance of one magnetic circuit is increased, and the impedance of the magnetic circuit is decreased at the other side, with the result that the impedance of the magnetic circuit as a whole can be maintained constant. Further, the power-assisted bicycle 1 of the present invention is provided with a limiter. When the power-assisted bicycle 1 travels at a predetermined speed, the auxiliary unit is stopped regardless of the output from the pedaling force detecting device, and the assist torque is not generated. In order to detect the traveling speed of the power-assisted bicycle 1, the detection signal of the N-pole detected by the rotor position detector 87 of the electric motor 15 is used. The number of N poles of the permanent magnet 90 fixed to the rotor 86 of the electric motor 15 is determined by the motor (here, 4 poles), and the detection of the N pole outputted from the rotor position detector 87 is counted by counting. The number of revolutions (rotational speed) of the electric motor 15 can be obtained by the signal. 24 312 / invention manual (supplement) / 92-12 / 92125190. 1279354 When the rider steps on the cranks 18L, 18R and applies the pedaling torque, as described above, the electric motor 15 is driven by the control circuit 1 10 , and the auxiliary sprocket 24 of the auxiliary power unit 16 is assisted by the chain 2 2 Torque. At this time, since the second one-way clutch 65 constituting the auxiliary power unit 16 is connected, the rotation of the motor shaft 57 of the electric motor 15 and the rotation of the auxiliary sprocket 24 are proportional to the gear ratio of the reduction gear set 56. Thus, the vehicle speed of the electric assist bicycle 1 can be obtained from the number of revolutions of the motor shaft 57 of the electric motor 15. In addition, the pedaling torque of the rider is applied to the cranks 18L and 18R. If the vehicle speed increases and exceeds the predetermined speed, the electric motor 15 of the auxiliary power unit 16 stops without the assist torque, but since the second The one-way clutch 65 slides without torque from the chain 2 2 to the auxiliary power unit 16. The auxiliary power unit 16 does not interfere with the rotation of the crank pedal caused by the cranks 18L, 18R. The limiter for controlling the assist torque according to the vehicle speed transmits the output of the rotor position detector 87 of the electric motor 15 to the above-described control device 110, and the control of the electric motor 15 can be realized while the CPU 114 calculates the vehicle speed. In addition, FIG. 21 shows a case where the control device 1 10 controls a DC motor having a conventional rectifying element, and the brushless DC motor described above generates three outputs from the output of the battery B in order to control the DC motor. The phase pulse voltage is applied to the electric motor 15 to correspond. According to the above description, the electric assist bicycle according to the present invention is provided with a housing member that covers the large-diameter gear of the reduction gear mechanism constituting the power unit while the auxiliary power unit is disposed below the rear fork. 312 / invention manual (supplement) / 92-12 / 92125190. 25 1279354 The bicycle bracket that inserts a pair of left and right sides from below is used to reduce the manufacturing cost. In addition, the lower part of the fork allows for an effective space, and the battery box and the large-capacity auxiliary power unit can be arranged to stably travel while the auxiliary power unit is inconspicuous due to the crank step. In addition, the electric assisted self-propulsion can be further reduced by being placed on the side so as to be almost equal to the upper surface of the rear fork. Further, while having the vicinity of the board of the auxiliary power unit, the first rotating shaft having the configuration and the horse of the electric motor are arranged side by side horizontally as viewed from the side, and the auxiliary power transmitting portion of the power unit is provided with the bottom surface of the force unit from the ground. angle. Further, the above-described reduction gear mechanism 2 rotating shaft is disposed on the first rotating shaft to secure the bottom surface of the auxiliary power unit. [Fig. 1 is a schematic view of the electric assisting self-supporting member of the present invention. The bracket is configured to arrange the auxiliary power unit above the rear fork and the rear box of the seat tube. In addition, since the weight is reduced, the position of the center of gravity, the plate and the chain, and the upper portion of the protruding portion of the member such as the chain cover can be lowered. With such a configuration, the center of gravity of the vehicle can stably drive the motor of the motor. The shaft is disposed in a position close to the ground at the position of the reduction gear of the auxiliary power unit, and can ensure the auxiliary moving height, and can ensure that the winding transmission member hung on the auxiliary branch has the second winding. By rotating the shaft and looking at the upper side from the side, with such a configuration, there is a certain height from the ground. Side view of the traffic. 26 312 / invention manual (supplement) / 92-12 / 92125190. 1279354 is an enlarged view of a main part of the electric assist bicycle of the present invention, and FIG. 2(A) is a side view in the case where the auxiliary unit is mounted, and FIG. 2(B) is a side in the case where the auxiliary unit is removed. view. Figure 3 is a cross-sectional view of the electric assisted bicycle crankshaft and the drive sprocket of the present invention. Figure 4 is a cross-sectional view taken along line IV - I V of Figure 3; Figure 5 is a cross-sectional view taken along line V - V of Figure 2 (A). Figure 6 is a cross-sectional view taken along line V I - V I of Figure 2 (A). Figure 7 is a cross-sectional view taken along line V I I - V I I of Figure 2 (A). Figure 8 is a side elevational view of the left cover half. Figure 9 is a side elevational view of the right cover half. Figure 10 is a cross-sectional view of the electric motor. Figure 11 is a cross-sectional view taken along line X I - X I of Figure 10. Figure 12 is a cross-sectional view taken along line X I I - X I I of Figure 10. Figure 13 is a wiring diagram of the stator coil of the electric motor. Fig. 14 is a cross-sectional view showing the main part of the sensor portion of the pedaling force detecting device. Fig. 15 is a front view of the sensor portion of the pedaling force detecting device. Fig. 16 is a front view of the first inductor. Figure 17 is a cross-sectional view of the second inductor. Fig. 18 is a cross-sectional view of the second inductor. Fig. 19 is a schematic view showing a magnetic circuit through which a magnetic flux generated by a coil passes. Fig. 20 is a view showing the degree of overlap between the first inductor and the second inductor, 27 312/invention specification (supplement)/92-12/92125190. 1279354 Fig. 2 Ο (A) is the graph of the hourly torque, and Fig. 2 Ο (B) is the graph when the pedaling torque is large. Fig. 21 is a pedaling force detecting circuit of the control device. Fig. 2 2 is a graph showing the relationship between the voltage and the pedaling force of the coil. Fig. 2 2 (A) is a waveform diagram at point a of Fig. 21, and Fig. 2 2 (B) is a waveform at point b of Fig. 21, Fig. 2 2 (C) is a graph showing the relationship between the coil voltage and the pedaling force at point c in Fig. 21 . (Component symbol description) 1 Electric assist bicycle 2 Body frame 3 Front front tube 4 Down tube 5 Support tube 6 Seat tube 7 Front fork 8 Steering handlebar 9 Rear fork 9 L, 9 R Support member 10 Strut 11 Seat 12 Seat Pillar 13 Battery storage box 14 Electrical box 15 Electric motor (motor) 31W invention manual (supplement) / 92-12/92125190. 28
1279354 16 輔 助 動 力 單 元 17 曲 柄 軸 1 8L、 1 8R 曲 柄 1 9L、 1 9R 蓋 .板 20L、 20R 滾 •球 幸由 承 21 驅 動 鏈 輪 22 鏈 條 23 從 動 鏈 輪 24 輔 助 鏈 輪 25 惰 輪 26 第 1 單 向 離 合器 27 内 輪 27Α 轴 襯 28 A 螺 母 28B 板 29 蓋 體 30 傳 遞 板 31 窗 32 壓 縮 螺 旋 彈 簧 33 棘 輪 齒 34 彈 簧 35 棘 輪 爪 36 罩 37 固 定 孔 312/發明說明書(補件)/9孓12〜2125190·1279354 16 Auxiliary power unit 17 Crankshaft 1 8L, 1 8R Crank 1 9L, 1 9R cover. Plate 20L, 20R Rolling ball ball bearing 21 Drive sprocket 22 Chain 23 Drive sprocket 24 Auxiliary sprocket 25 Idler 26 1st one-way clutch 27 inner wheel 27Α bushing 28 A nut 28B plate 29 cover 30 transfer plate 31 window 32 compression coil spring 33 ratchet teeth 34 spring 35 ratchet claw 36 cover 37 fixing hole 312 / invention manual (supplement) / 9孓12~2125190·
29 1279354 38 突 起 部 39 窗 40 小 窗 41 壓 縮 螺 旋 彈簧 42 轉 動 方 向 43 感 測 器 部 44 外 側 環 45 感 測 器 本 體 46 套 管 47 法 蘭 盤 48 罩 48A 開 口 50 箱 (收納構件） 51 右 半 箱 體 52 左 半 箱 體 53 罩 54 第 1 收 納 室 55 第 2 收 納 室 56 減 速 齒 輪 組 57 馬 達 軸 58 1 次 減 速 驅動齒 59 第 1 轉 動 軸 60 螺 栓 6 1 1 次 減. 速. 從動齒 312/發明說明書(補件)/92-12/92125190. 1279354 62 2次； 咸： 違·: m 動 齒 63 2次； 咸： it > 從 動 齒 64 第 2 轉 動 軸 65 第 2 單 向 離 合 器 66 密 封 構 件 67 增 強 板 68 螺 栓 69 滚 珠 軸 承 70 滚 珠 軸 承 71 滚 珠 軸 承 72 滚 珠 車由 承 73 肋 74 欲 合 筒 部 75 馬 達 殼 76 螺 孔 77 支 撐 壁 部 79 托 架 80 懸 掛 部 81L、 81R 托架 82 懸 掛 部 83 支 撐 構 件 84 突 出 部 85 定 子 86 轉 子 312/發明說明書(補件)/92-12/92125190. 31 1279354 87 轉 子 位 置 檢 測器 88 定 子 磁 芯 89 繞 定 子 線 圈 90 永 久 磁 鐵 91 滾 珠 軸 承 92 滾 珠 軸 承 93 托 架 94 輸 入 端 子 95 踏 力 傳 遞 環 (内側環） 96 螺 栓 孔 97A 第 1 感 應 體 97B 第 2 感 應 體 98 環 狀 磁 芯 板 99 環 狀 磁 芯 板 100 磁 芯 軸 環 101 線 圈 104 引 出 線 1 05 油 封 106 密 封 件 1 07 密 封 件 108 齒 1 09A、 1 09B 突起· 郎 110 控 制 裝 置 111 振 盪 電 路 312/發明說明書(補件)/92-12/92125190.29 1279354 38 Projection 39 Window 40 Small window 41 Compression coil spring 42 Direction of rotation 43 Sensor part 44 Outer ring 45 Sensor body 46 Sleeve 47 Flange 48 Cover 48A Opening 50 Box (receiving member) 51 Right half Case 52 Left half case 53 Cover 54 1st storage chamber 55 2nd storage chamber 56 Reduction gear set 57 Motor shaft 58 1 deceleration drive tooth 59 1st rotation axis 60 Bolt 6 1 1 reduction. Speed. Driven tooth 312 / invention manual (supplement) / 92-12 / 92125190. 1279354 62 2 times; salty: violated: m moving teeth 63 2 times; salty: it > driven tooth 64 2nd rotation axis 65 2nd one-way Clutch 66 Sealing member 67 Reinforcement plate 68 Bolt 69 Ball bearing 70 Ball bearing 71 Ball bearing 72 Ball bearing bracket 73 Rib 74 For fitting cylinder 75 Motor housing 76 Screw hole 77 Support wall 79 Bracket 80 Suspension 81L, 81R Rack 82 suspension 83 Support member 84 Projection 85 Stator 86 Rotor 312 / Invention specification (supplement) / 92-12/92125190. 31 1279354 87 Rotor position detector 88 Stator core 89 Winding around stator coil 90 Permanent magnet 91 Ball bearing 92 Ball bearing 93 Bracket 94 Input terminal 95 pedal force transmission ring (inner ring) 96 Bolt hole 97A 1st inductor 97B 2nd inductor 98 Annular core plate 99 Annular core plate 100 Core collar 101 Coil 104 Lead wire 1 05 Oil seal 106 Seal 1 07 Seal 108 Tooth 1 09A, 1 09B Protrusion · Lang 110 Control device 111 Oscillation circuit 312 / invention manual (supplement) / 92-12/92125190.
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112 峰值 保持電路 113 阻抗 114 CPU 116 主開 關 117 FET 118 二極 體 119 電容 120 接點 WF 前輪 WR 後輪 B 電池 312/發明說明書(補件)/92-12/92125190. 33112 Peak hold circuit 113 Impedance 114 CPU 116 Main switch 117 FET 118 Diode 119 Capacitor 120 Contact WF Front wheel WR Rear wheel B Battery 312/Invention manual (supplement)/92-12/92125190. 33