FAF69減速器銘牌參數說(shuō)明解讀含義:有關(guān)型號描述的詳細情況及其他信息可以參閱本業(yè)附件下載中的FAF69減速器選型樣本。
FAF69-YEJB4KW-4P-27.41-M4-90°
FAF:系列代號
69:減速機規格代號
YEJB:電機
4KW:電機功率
4P:電機級數
27.41:減速機傳動(dòng)比
M4:減速機安裝位置
90°:接線(xiàn)盒位置
FAF69減速器聯(lián)軸器安裝:
FAF69減速器聯(lián)軸器安裝提示:未避免配合出發(fā)生腐蝕,建議在裝配半聯(lián)軸器之前用潤滑油涂覆電機軸。
FAF69減速器聯(lián)軸器安裝注意事項:將電機裝配到聯(lián)軸器時(shí),聯(lián)軸器中可能滲人水汽;用抗氧化密封膠密封聯(lián)軸器和電機法蘭連接面。
FAF69減速器聯(lián)軸器安裝允許荷載:安裝電機時(shí)可能出現超常負荷;嚴禁超出下表所列的負荷值。電機的最大允許重力Fqmax隨著(zhù)中心距X的增加而呈線(xiàn)性下降;中心距X減少的情況下,最大許可重力Fqmax不增加;AM聯(lián)軸器輸出法蘭的直徑:160mm;帶逆止器AM../RS的AM聯(lián)軸器;安裝或運行前檢查驅動(dòng)裝置的旋轉方向是否正確;錯誤請與BOSERL公司客戶(hù)服務(wù)部聯(lián)系。變頻電機減速機
FAF69AM聯(lián)軸器型號 | X1) [mm] | F q [N] |
IEC | NEMA | IEC AM聯(lián)軸器 | NEMA AM聯(lián)軸器 |
AM63/71 | AM65 | 77 | 530 | 410 |
AM80/90 | AM143/145 | 113 | 420 | 380 |
AM100/112 | AM182/184 | 144 | 2000 | 1760 |
AM132 | AM213/215 | 186 | 1600 | 1250 |
AM132 | AM213/215 | 186 | 4700 | 3690 |
AM160/180 | AM254/286 | 251 | 4600 | 4340 |
AM200/225 | AM324-AM365 | 297 | 5600 | 5250 |
AM250/280 | - | 390 | 11200 | - |
FAF69減速器聯(lián)軸器安裝步驟:清潔電機軸和連接表面以及聯(lián)軸器;拆下電機軸的鍵并且使用隨帶的鍵[484]代替(不包括AM63以及AM250);半聯(lián)軸器[479]加熱到約80-100°C,然后推入電機軸。對半聯(lián)軸器定位如下:IEC-聯(lián)軸器AM63-225安裝至電機軸軸肩處,IEC-聯(lián)軸器AM250-280安裝至尺寸A處,帶軸套[491]的NEMA-聯(lián)軸器安裝至尺寸A處;按照下表中扭矩值TA,使用緊固螺釘[481]將鍵和半聯(lián)軸器固定在電機軸上;檢查安裝尺寸A;采用合適的表面密封材料對聯(lián)軸器及電機的接觸平面進(jìn)行密封;將電機裝在聯(lián)軸器上,裝配中確保兩個(gè)半聯(lián)軸器與梅花彈性體嚙合良好。[1]電機軸,[479]半聯(lián)軸器,[481]緊固螺釘,[484]鍵,[491]軸套。齒輪減速電機
IEC AM | 63/71 | 80/ 90 | 100/ 112 | 132 | 160/ 180 | 200 | 225 | 250/ 280 |
A | 24.5 | 31.5 | 41.5 | 54 | 76 | 78.5 | 93.5 | 139 |
TA | 1.5 | 1.5 | 4.8 | 4.8 | 10 | 17 | 17 | 17 |
螺紋 | M4 | M4 | M6 | M6 | M8 | M10 | M10 | M10 |
NEMA AM | 56 | 143/145 | 182/184 | 213/ 215 | 254/256 | 284/286 | 324/ 326 | 364/ 365 |
A | 46 | 43 | 55 | 63.5 | 78.5 | 85.5 | 107 | 107 |
TA | 1.5 | 1.5 | 4.8 | 4.8 | 10 | 17 | 17 | 17 |
螺紋 | M4 | M4 | M6 | M6 | M8 | M10 | M10 | M10 |
FAF69減速器檢查維修:
FAF69減速器調試/運行:在沒(méi)有連接外部設備的狀態(tài)下檢查轉向是否正確。檢查時(shí)注意轉動(dòng)過(guò)程中是否產(chǎn)生異常摩擦聲。調試運行時(shí),若未安裝輸出部件,則應緊固鍵。檢測裝置和保護裝置即使在試運行狀態(tài)下亦不得關(guān)閉。若出現不同與正常運行狀態(tài)的變化(例如升溫、噪音、震動(dòng)),則必須在可疑情況下關(guān)閉減速電機。查明原因,并在必要情況下與BOSERL公司聯(lián)系。
FAF69減速器的操作工作只可由經(jīng)過(guò)培訓的專(zhuān)業(yè)人員執行。專(zhuān)業(yè)人員是指熟悉安裝位置、機械安裝、產(chǎn)品的故障排除與維護并具備下列資質(zhì)的人員: 接受過(guò)機械專(zhuān)業(yè)的培訓(如機械工程師或機電工程師)并通過(guò)結業(yè)考試。違規拆必要的防護罩板、設備的不當使用以及錯誤安裝或操作設備均可導致嚴重的人員傷害或財產(chǎn)損失。
FAF69減速器聯(lián)軸器AL/AM/AQ的檢查/維修:軸承、聯(lián)軸器,檢查是否可能因軸承損壞產(chǎn)生運轉噪音,檢查聯(lián)軸器是否漏油;彈性體,檢查圓周齒隙,檢查聯(lián)軸器的彈性體;軸承、油封、彈性體,更換滾動(dòng)軸承潤滑脂,更換油封(不要安裝在同樣工作軌跡上),更換彈性體。
FAF69減速器輸入端裝置AD的檢查/維修:軸承、聯(lián)軸器,檢查是否可能因軸承損壞產(chǎn)生運轉噪音,檢查聯(lián)軸器是否漏油;軸承,更換滾動(dòng)軸承油脂;油封,更換油封。為了避免高徑向力:請按圖B裝配齒輪或者鏈輪。平行軸斜齒輪減速機
收到FAF69減速器后請立即檢查送貨有無(wú)運輸損壞。如有損壞請立即通知運輸公司。必要情況下不得對設備進(jìn)行調試運行。擰緊運輸吊耳。由于吊耳的設計負載僅針對電機/減速電機重量,因此不得額外增加負荷。已經(jīng)安裝好的吊環(huán)螺栓符合GB825的規定。原則上要遵守標準中所注明的負荷和規定。如果減速電機上裝有兩個(gè)吊耳或者吊環(huán)螺栓,則運輸時(shí)必須用兩個(gè)吊環(huán)同時(shí)進(jìn)行吊裝。根據GB825規定,吊裝件的拉力方向不得超過(guò)45度斜角。必要情況下,應使用相應的、有足夠承載力的運輸工具。調試前拆除所有運輸緊固件。
FAF69減速器型號:
XDFAF67-Y0.18KW,XDFAF67-Y0.25KW,XDFAF67-Y0.37KW,XDFAF67-Y0.55KW,XDFAF67-Y0.75KW,XDFAF67-Y1.1KW,XDFAF67-Y1.5KW,XDFAF67-Y100M4,XDFAF67-Y112M4,XDFAF67-Y132M4,XDFAF67-Y2.2KW,XDFAF67-Y3KW,XDFAF67-Y4KW,XDFAF67-Y5.5KW,XDFAF67-Y63M4,XDFAF67-Y71M4,XDFAF67-Y80M4,XDFAF67-Y90M4,XDFAF67-YB100M4,XDFAF67-YB112M4,XDFAF67-YB132M4,XDFAF67-YB63M4,XDFAF67-YB71M4,XDFAF67-YB80M4,XDFAF67-YB90M4,XDFAF67-YDP100M4,XDFAF67-YDP112M4,XDFAF67-YDP132M4,XDFAF67-YDP63M4,XDFAF67-YDP71M4,XDFAF67-YDP80M4,XDFAF67-YDP90M4,XDFAF67-YE100M4,XDFAF67-YE112M4,XDFAF67-YE132M4,XDFAF67-YE63M4,XDFAF67-YE71M4,XDFAF67-YE80M4,XDFAF67-YE90M4,XDFAF67-YEJ100M4,XDFAF67-YEJ112M4,XDFAF67-YEJ132M4,XDFAF67-YEJ63M4,XDFAF67-YEJ71M4,XDFAF67-YEJ80M4,XDFAF67-YEJ90M4,XDFAF67-YEJB100M4,XDFAF67-YEJB112M4,XDFAF67-YEJB132M4,XDFAF67-YEJB63M4,XDFAF67-YEJB71M4,XDFAF67-YEJB80M4,XDFAF67-YEJB90M4,XDFAF67-YP100M4,XDFAF67-YP112M4,XDFAF67-YP132M4,XDFAF67-YP63M4,XDFAF67-YP71M4,XDFAF67-YP80M4,XDFAF67-YP90M4,XDFAF67-YPB100M4,XDFAF67-YPB112M4,XDFAF67-YPB132M4,XDFAF67-YPB63M4,XDFAF67-YPB71M4,XDFAF67-YPB80M4,XDFAF67-YPB90M4,XDFAF67-YPE100M4,XDFAF67-YPE112M4,XDFAF67-YPE132M4,XDFAF67-YPE63M4,XDFAF67-YPE71M4,XDFAF67-YPE80M4,XDFAF67-YPE90M4,XDFAF67-YS100M4,XDFAF67-YS112M4,XDFAF67-YS132M4,XDFAF67-YS63M4,XDFAF67-YS71M4,XDFAF67-YS80M4,XDFAF67-YS90M4,XDFAF67-YVB100M4,XDFAF67-YVB112M4,XDFAF67-YVB132M4,XDFAF67-YVB63M4,XDFAF67-YVB71M4,XDFAF67-YVB80M4,XDFAF67-YVB90M4,XDFAF67-YVP100M4,XDFAF67-YVP112M4,XDFAF67-YVP132M4,XDFAF67-YVP63M4,XDFAF67-YVP71M4,XDFAF67-YVP80M4,XDFAF67-YVP90M4,XDFAF67-YVPEJ100M4,XDFAF67-YVPEJ112M4,XDFAF67-YVPEJ132M4,XDFAF67-YVPEJ63M4,XDFAF67-YVPEJ71M4,XDFAF67-YVPEJ80M4,XDFAF67-YVPEJ90M4,FWF67-Y0.18KW,FWF67-Y0.25KW,FWF67-Y0.37KW,FWF67-Y0.55KW,FWF67-Y0.75KW,FWF67-Y1.1KW,FWF67-Y1.5KW,FWF67-Y100M4,FWF67-Y112M4,FWF67-Y132M4,FWF67-Y2.2KW,FWF67-Y3KW,FWF67-Y4KW,FWF67-Y5.5KW,FWF67-Y63M4,FWF67-Y71M4,FWF67-Y80M4,FWF67-Y90M4,FWF67-YB100M4,FWF67-YB112M4,FWF67-YB132M4,FWF67-YB63M4,FWF67-YB71M4,FWF67-YB80M4,FWF67-YB90M4,FWF67-YDP100M4,FWF67-YDP112M4,FWF67-YDP132M4,FWF67-YDP63M4,FWF67-YDP71M4,FWF67-YDP80M4,FWF67-YDP90M4,FWF67-YE100M4,FWF67-YE112M4,FWF67-YE132M4,FWF67-YE63M4,FWF67-YE71M4,FWF67-YE80M4,FWF67-YE90M4,FWF67-YEJ100M4,FWF67-YEJ112M4,FWF67-YEJ132M4,FWF67-YEJ63M4,FWF67-YEJ71M4,FWF67-YEJ80M4,FWF67-YEJ90M4,FWF67-YEJB100M4,FWF67-YEJB112M4,FWF67-YEJB132M4,FWF67-YEJB63M4,FWF67-YEJB71M4,FWF67-YEJB80M4,FWF67-YEJB90M4,FWF67-YP100M4,FWF67-YP112M4,FWF67-YP132M4,FWF67-YP63M4,FWF67-YP71M4,FWF67-YP80M4,FWF67-YP90M4,FWF67-YPB100M4,FWF67-YPB112M4,FWF67-YPB132M4,FWF67-YPB63M4,FWF67-YPB71M4,FWF67-YPB80M4,FWF67-YPB90M4,FWF67-YPE100M4,FWF67-YPE112M4,FWF67-YPE132M4,FWF67-YPE63M4,FWF67-YPE71M4,FWF67-YPE80M4,FWF67-YPE90M4,FWF67-YS100M4,FWF67-YS112M4,FWF67-YS132M4,FWF67-YS63M4,FWF67-YS71M4,FWF67-YS80M4,FWF67-YS90M4,FWF67-YVB100M4,FWF67-YVB112M4,FWF67-YVB132M4,FWF67-YVB63M4,FWF67-YVB71M4,FWF67-YVB80M4,FWF67-YVB90M4,FWF67-YVP100M4,FWF67-YVP112M4,FWF67-YVP132M4,FWF67-YVP63M4,FWF67-YVP71M4,FWF67-YVP80M4,FWF67-YVP90M4,FWF67-YVPEJ100M4,FWF67-YVPEJ112M4,FWF67-YVPEJ132M4,FWF67-YVPEJ63M4,FWF67-YVPEJ71M4,FWF67-YVPEJ80M4,FWF67-YVPEJ90M4,JCFAF67-Y0.18KW,JCFAF67-Y0.25KW,JCFAF67-Y0.37KW,JCFAF67-Y0.55KW,JCFAF67-Y0.75KW,JCFAF67-Y1.1KW,JCFAF67-Y1.5KW,JCFAF67-Y100M4,JCFAF67-Y112M4,JCFAF67-Y132M4,JCFAF67-Y2.2KW,JCFAF67-Y3KW,JCFAF67-Y4KW,JCFAF67-Y5.5KW,JCFAF67-Y63M4,JCFAF67-Y71M4,JCFAF67-Y80M4,JCFAF67-Y90M4,JCFAF67-YB100M4,JCFAF67-YB112M4,JCFAF67-YB132M4,JCFAF67-YB63M4,JCFAF67-YB71M4,JCFAF67-YB80M4,JCFAF67-YB90M4,JCFAF67-YDP100M4,JCFAF67-YDP112M4,JCFAF67-YDP132M4,JCFAF67-YDP63M4,JCFAF67-YDP71M4,JCFAF67-YDP80M4,JCFAF67-YDP90M4,JCFAF67-YE100M4,JCFAF67-YE112M4,JCFAF67-YE132M4,JCFAF67-YE63M4,JCFAF67-YE71M4,JCFAF67-YE80M4,JCFAF67-YE90M4,JCFAF67-YEJ100M4,JCFAF67-YEJ112M4,JCFAF67-YEJ132M4,JCFAF67-YEJ63M4,JCFAF67-YEJ71M4,JCFAF67-YEJ80M4,JCFAF67-YEJ90M4,JCFAF67-YEJB100M4,JCFAF67-YEJB112M4,JCFAF67-YEJB132M4,JCFAF67-YEJB63M4,JCFAF67-YEJB71M4,JCFAF67-YEJB80M4,JCFAF67-YEJB90M4,JCFAF67-YP100M4,JCFAF67-YP112M4,JCFAF67-YP132M4,JCFAF67-YP63M4,JCFAF67-YP71M4,JCFAF67-YP80M4,JCFAF67-YP90M4,JCFAF67-YPB100M4,JCFAF67-YPB112M4,JCFAF67-YPB132M4,JCFAF67-YPB63M4,JCFAF67-YPB71M4,JCFAF67-YPB80M4,JCFAF67-YPB90M4,JCFAF67-YPE100M4,JCFAF67-YPE112M4,JCFAF67-YPE132M4,JCFAF67-YPE63M4,JCFAF67-YPE71M4,JCFAF67-YPE80M4,JCFAF67-YPE90M4,JCFAF67-YS100M4,JCFAF67-YS112M4,JCFAF67-YS132M4,JCFAF67-YS63M4,JCFAF67-YS71M4,JCFAF67-YS80M4,JCFAF67-YS90M4,JCFAF67-YVB100M4,JCFAF67-YVB112M4,JCFAF67-YVB132M4,JCFAF67-YVB63M4,JCFAF67-YVB71M4,JCFAF67-YVB80M4,JCFAF67-YVB90M4,JCFAF67-YVP100M4,JCFAF67-YVP112M4,JCFAF67-YVP132M4,JCFAF67-YVP63M4,JCFAF67-YVP71M4,JCFAF67-YVP80M4,JCFAF67-YVP90M4,JCFAF67-YVPEJ100M4,JCFAF67-YVPEJ112M4,JCFAF67-YVPEJ132M4,JCFAF67-YVPEJ63M4,JCFAF67-YVPEJ71M4,JCFAF67-YVPEJ80M4,JCFAF67-YVPEJ90M4,YQFAF67-Y0.18KW,YQFAF67-Y0.25KW,YQFAF67-Y0.37KW,YQFAF67-Y0.55KW,YQFAF67-Y0.75KW,YQFAF67-Y1.1KW,YQFAF67-Y1.5KW,YQFAF67-Y100M4,YQFAF67-Y112M4,YQFAF67-Y132M4,YQFAF67-Y2.2KW,YQFAF67-Y3KW,YQFAF67-Y4KW,YQFAF67-Y5.5KW,YQFAF67-Y63M4,YQFAF67-Y71M4,YQFAF67-Y80M4,YQFAF67-Y90M4,YQFAF67-YB100M4,YQFAF67-YB112M4,YQFAF67-YB132M4,YQFAF67-YB63M4,YQFAF67-YB71M4,YQFAF67-YB80M4,YQFAF67-YB90M4,YQFAF67-YDP100M4,YQFAF67-YDP112M4,YQFAF67-YDP132M4,YQFAF67-YDP63M4,YQFAF67-YDP71M4,YQFAF67-YDP80M4,YQFAF67-YDP90M4,YQFAF67-YE100M4,YQFAF67-YE112M4,YQFAF67-YE132M4,YQFAF67-YE63M4,YQFAF67-YE71M4,YQFAF67-YE80M4,YQFAF67-YE90M4,YQFAF67-YEJ100M4,YQFAF67-YEJ112M4,YQFAF67-YEJ132M4,YQFAF67-YEJ63M4,YQFAF67-YEJ71M4,YQFAF67-YEJ80M4,YQFAF67-YEJ90M4,YQFAF67-YEJB100M4,YQFAF67-YEJB112M4,YQFAF67-YEJB132M4,YQFAF67-YEJB63M4,YQFAF67-YEJB71M4,YQFAF67-YEJB80M4,YQFAF67-YEJB90M4,YQFAF67-YP100M4,YQFAF67-YP112M4,YQFAF67-YP132M4,YQFAF67-YP63M4,YQFAF67-YP71M4,YQFAF67-YP80M4,YQFAF67-YP90M4,YQFAF67-YPB100M4,YQFAF67-YPB112M4,YQFAF67-YPB132M4,YQFAF67-YPB63M4,YQFAF67-YPB71M4,YQFAF67-YPB80M4,YQFAF67-YPB90M4,YQFAF67-YPE100M4,YQFAF67-YPE112M4,YQFAF67-YPE132M4,YQFAF67-YPE63M4,YQFAF67-YPE71M4,YQFAF67-YPE80M4,YQFAF67-YPE90M4,YQFAF67-YS100M4,YQFAF67-YS112M4,YQFAF67-YS132M4,YQFAF67-YS63M4,YQFAF67-YS71M4,YQFAF67-YS80M4,YQFAF67-YS90M4,YQFAF67-YVB100M4,YQFAF67-YVB112M4,YQFAF67-YVB132M4,YQFAF67-YVB63M4,YQFAF67-YVB71M4,YQFAF67-YVB80M4,YQFAF67-YVB90M4,YQFAF67-YVP100M4,YQFAF67-YVP112M4,YQFAF67-YVP132M4,YQFAF67-YVP63M4,YQFAF67-YVP71M4,YQFAF67-YVP80M4,YQFAF67-YVP90M4,YQFAF67-YVPEJ100M4,YQFAF67-YVPEJ112M4,YQFAF67-YVPEJ132M4,YQFAF67-YVPEJ63M4,YQFAF67-YVPEJ71M4,YQFAF67-YVPEJ80M4,YQFAF67-YVPEJ90M4,FAF69-Y0.18KW,FAF69-Y0.25KW,FAF69-Y0.37KW,FAF69-Y0.55KW,FAF69-Y0.75KW,FAF69-Y1.1KW,FAF69-Y1.5KW,FAF69-Y100M4,FAF69-Y112M4,FAF69-Y132M4,FAF69-Y2.2KW,FAF69-Y3KW,FAF69-Y4KW,FAF69-Y5.5KW,FAF69-Y63M4,FAF69-Y71M4,FAF69-Y80M4,FAF69-Y90M4,FAF69-YB100M4,FAF69-YB112M4,FAF69-YB132M4,FAF69-YB63M4,FAF69-YB71M4,FAF69-YB80M4,FAF69-YB90M4,FAF69-YDP100M4,FAF69-YDP112M4,FAF69-YDP132M4,FAF69-YDP63M4,FAF69-YDP71M4,FAF69-YDP80M4,FAF69-YDP90M4,FAF69-YE100M4,FAF69-YE112M4,FAF69-YE132M4,FAF69-YE63M4,FAF69-YE71M4,FAF69-YE80M4,FAF69-YE90M4,FAF69-YEJ100M4,FAF69-YEJ112M4,FAF69-YEJ132M4,FAF69-YEJ63M4,FAF69-YEJ71M4,FAF69-YEJ80M4,FAF69-YEJ90M4,FAF69-YEJB100M4,FAF69-YEJB112M4,FAF69-YEJB132M4,FAF69-YEJB63M4,FAF69-YEJB71M4,FAF69-YEJB80M4,FAF69-YEJB90M4,FAF69-YP100M4,FAF69-YP112M4,FAF69-YP132M4,FAF69-YP63M4,FAF69-YP71M4,FAF69-YP80M4,FAF69-YP90M4,FAF69-YPB100M4,FAF69-YPB112M4,FAF69-YPB132M4,FAF69-YPB63M4,FAF69-YPB71M4,FAF69-YPB80M4,FAF69-YPB90M4,FAF69-YPE100M4,FAF69-YPE112M4,FAF69-YPE132M4,FAF69-YPE63M4,FAF69-YPE71M4,FAF69-YPE80M4,FAF69-YPE90M4,FAF69-YS100M4,FAF69-YS112M4,FAF69-YS132M4,FAF69-YS63M4,FAF69-YS71M4,FAF69-YS80M4,FAF69-YS90M4,FAF69-YVB100M4,FAF69-YVB112M4,FAF69-YVB132M4,FAF69-YVB63M4,FAF69-YVB71M4,FAF69-YVB80M4,FAF69-YVB90M4,FAF69-YVP100M4,FAF69-YVP112M4,FAF69-YVP132M4,FAF69-YVP63M4,FAF69-YVP71M4,FAF69-YVP80M4,FAF69-YVP90M4,FAF69-YVPEJ100M4,FAF69-YVPEJ112M4,FAF69-YVPEJ132M4,FAF69-YVPEJ63M4,FAF69-YVPEJ71M4,FAF69-YVPEJ80M4,FAF69-YVPEJ90M4,FAF67SF80,FAF67SF90,FAF67SF100,FAF67SF112,FAF67SF115,FAF67SF140,FAF67SF160,FAF67SF190。
FAF69減速器生產(chǎn)工廠(chǎng)展示:看廠(chǎng)請聯(lián)系微信13827261050,獲取位置,需提前一天預約http://www.jinnengyun.com/product/list-fafxiliejiansuji-cn.html
推薦類(lèi)似型號:F69減速機
關(guān)鍵詞:帶調速電機減速機一體機_變頻電機減速機_FAF系列減速機_扁平減速機_FAF向減速機_變頻減速機_調速減速機_GFAF系列減速機_FAF系列減速器
FAF系列齒輪減速電機型號:FAF29減速機,FAF39減速機,FAF49減速機,FAF69減速機,FAF79減速機,FAF89減速機,FAF99減速機,FAF109減速機,FAF129減速機,FAF159減速機
FAF系列電動(dòng)機減速機可配變頻電機,剎車(chē)電機,防爆電機,伺服電機,交流電機,直流電機,三相電機,單相電機 0.12KW-132KW之間
如需工程師幫選型,請加微信13827261050,留言告知工程師參數要求
標簽:   FAF69減速器 FAF67斜齒輪減速機 FAF67減速機3D模型 FAF67型減速機選型參數 FAF67立式減速機一體機 FAF67伺服減速機