FA99減速器銘牌參數(shù)說明解讀含義：有關(guān)型號描述的詳細(xì)情況及其他信息可以參閱本業(yè)附件下載中的FA99減速器選型樣本。

FA99-YB5.5KW-4P-80.31-M2-270°

FA：系列代號

99：減速機(jī)規(guī)格代號

YB：電機(jī)

5.5KW：電機(jī)功率

4P：電機(jī)級數(shù)

80.31：減速機(jī)傳動(dòng)比

M2：減速機(jī)安裝位置

270°：接線盒位置

FA99減速器逆止器安裝：

轉(zhuǎn)向要根據(jù)輸出軸（LSS）來確定；順時(shí)針旋轉(zhuǎn)（CW）；逆時(shí)針旋轉(zhuǎn)（CCW）；應(yīng)在箱體上標(biāo)識出許可轉(zhuǎn)向。平行軸斜齒輪減速機(jī)

逆止器用來避免逆向轉(zhuǎn)動(dòng)；如此便可確保運(yùn)行過程中的定向轉(zhuǎn)動(dòng)。注意：逆向運(yùn)轉(zhuǎn)可能導(dǎo)致逆止器損壞；電機(jī)不允許逆向轉(zhuǎn)動(dòng)；注意供電是否正確，以確保電機(jī)定向轉(zhuǎn)動(dòng)；可以使電機(jī)輸出一半的額定扭矩來檢查逆止器方向。

FA99減速器帶逆止器的輸入端裝置AD../RS：安裝或運(yùn)送前檢查驅(qū)動(dòng)裝置的旋轉(zhuǎn)方向是否正確，若轉(zhuǎn)向錯(cuò)誤請與BOSERL公司客戶服務(wù)部聯(lián)系。在運(yùn)行過程中，逆止器不需要特別維護(hù)或其他的維護(hù)措施。分體電機(jī)減速機(jī)

如果低于最小超越轉(zhuǎn)速，則逆止器將會(huì)發(fā)生摩擦而產(chǎn)生高溫，可能造成財(cái)產(chǎn)損失；在額外工作狀態(tài)下，不得低于最小超越轉(zhuǎn)速；在啟動(dòng)或制動(dòng)階段可以低于最小超越轉(zhuǎn)速。根據(jù)各自的尺寸規(guī)格，逆止器的最小超越轉(zhuǎn)速如下表：

FA99減速器潤滑油檢查：

將一個(gè)容器置于油位檢查螺栓的下方；慢慢旋出油位檢查螺栓。由于最大許可注油高度超過了油位孔的下緣，因此在旋出螺栓時(shí)可能有少量油漏出；據(jù)下圖及相關(guān)表格檢查油位。

若油位過低則操作如下：旋入透氣螺栓；將同類潤滑油注入透氣孔直至油位檢查孔的下緣；重新旋入透氣螺塞。

重新旋入油位檢查螺栓，通過放油螺栓檢查油質(zhì)。齒輪減速電機(jī)

重新裝上安裝蓋，根據(jù)下表中的標(biāo)稱擰緊扭矩按照圖中標(biāo)明的順序由內(nèi)向外依次擰緊蓋上的螺栓；重復(fù)這一步驟多次，直至螺栓完全擰緊；只能采用氣動(dòng)扳手或力矩扳手，避免安裝時(shí)對蓋板產(chǎn)生破壞，避免用力過猛或使用強(qiáng)沖擊的工具。

FA99減速器型號：

XDFA97-Y0.75KW，XDFA97-Y1.1KW，XDFA97-Y1.5KW，XDFA97-Y100M4，XDFA97-Y112M4，XDFA97-Y11KW，XDFA97-Y132M4，XDFA97-Y15KW，XDFA97-Y160M4，XDFA97-Y18.5KW，XDFA97-Y180M4，XDFA97-Y2.2KW，XDFA97-Y200M4，XDFA97-Y22KW，XDFA97-Y30KW，XDFA97-Y3KW，XDFA97-Y4KW，XDFA97-Y5.5KW，XDFA97-Y7.5KW，XDFA97-Y80M4，XDFA97-Y90M4，XDFA97-YB100M4，XDFA97-YB112M4，XDFA97-YB132M4，XDFA97-YB160M4，XDFA97-YB180M4，XDFA97-YB200M4，XDFA97-YB80M4，XDFA97-YB90M4，XDFA97-YDP100M4，XDFA97-YDP112M4，XDFA97-YDP132M4，XDFA97-YDP160M4，XDFA97-YDP180M4，XDFA97-YDP200M4，XDFA97-YDP80M4，XDFA97-YDP90M4，XDFA97-YE100M4，XDFA97-YE112M4，XDFA97-YE132M4，XDFA97-YE160M4，XDFA97-YE180M4，XDFA97-YE200M4，XDFA97-YE80M4，XDFA97-YE90M4，XDFA97-YEJ100M4，XDFA97-YEJ112M4，XDFA97-YEJ132M4，XDFA97-YEJ160M4，XDFA97-YEJ180M4，XDFA97-YEJ200M4，XDFA97-YEJ80M4，XDFA97-YEJ90M4，XDFA97-YEJB100M4，XDFA97-YEJB112M4，XDFA97-YEJB132M4，XDFA97-YEJB160M4，XDFA97-YEJB180M4，XDFA97-YEJB200M4，XDFA97-YEJB80M4，XDFA97-YEJB90M4，XDFA97-YP100M4，XDFA97-YP112M4，XDFA97-YP132M4，XDFA97-YP160M4，XDFA97-YP180M4，XDFA97-YP200M4，XDFA97-YP80M4，XDFA97-YP90M4，XDFA97-YPB100M4，XDFA97-YPB112M4，XDFA97-YPB132M4，XDFA97-YPB160M4，XDFA97-YPB180M4，XDFA97-YPB200M4，XDFA97-YPB80M4，XDFA97-YPB90M4，XDFA97-YPE100M4，XDFA97-YPE112M4，XDFA97-YPE132M4，XDFA97-YPE160M4，XDFA97-YPE180M4，XDFA97-YPE200M4，XDFA97-YPE80M4，XDFA97-YPE90M4，XDFA97-YS100M4，XDFA97-YS112M4，XDFA97-YS132M4，XDFA97-YS160M4，XDFA97-YS180M4，XDFA97-YS200M4，XDFA97-YS80M4，XDFA97-YS90M4，XDFA97-YVB100M4，XDFA97-YVB112M4，XDFA97-YVB132M4，XDFA97-YVB160M4，XDFA97-YVB180M4，XDFA97-YVB200M4，XDFA97-YVB80M4，XDFA97-YVB90M4，XDFA97-YVP100M4，XDFA97-YVP112M4，XDFA97-YVP132M4，XDFA97-YVP160M4，XDFA97-YVP180M4，XDFA97-YVP200M4，XDFA97-YVP80M4，XDFA97-YVP90M4，XDFA97-YVPEJ100M4，XDFA97-YVPEJ112M4，XDFA97-YVPEJ132M4，XDFA97-YVPEJ160M4，XDFA97-YVPEJ180M4，XDFA97-YVPEJ200M4，XDFA97-YVPEJ80M4，XDFA97-YVPEJ90M4，YQFA97-Y0.75KW，YQFA97-Y1.1KW，YQFA97-Y1.5KW，YQFA97-Y100M4，YQFA97-Y112M4，YQFA97-Y11KW，YQFA97-Y132M4，YQFA97-Y15KW，YQFA97-Y160M4，YQFA97-Y18.5KW，YQFA97-Y180M4，YQFA97-Y2.2KW，YQFA97-Y200M4，YQFA97-Y22KW，YQFA97-Y30KW，YQFA97-Y3KW，YQFA97-Y4KW，YQFA97-Y5.5KW，YQFA97-Y7.5KW，YQFA97-Y80M4，YQFA97-Y90M4，YQFA97-YB100M4，YQFA97-YB112M4，YQFA97-YB132M4，YQFA97-YB160M4，YQFA97-YB180M4，YQFA97-YB200M4，YQFA97-YB80M4，YQFA97-YB90M4，YQFA97-YDP100M4，YQFA97-YDP112M4，YQFA97-YDP132M4，YQFA97-YDP160M4，YQFA97-YDP180M4，YQFA97-YDP200M4，YQFA97-YDP80M4，YQFA97-YDP90M4，YQFA97-YE100M4，YQFA97-YE112M4，YQFA97-YE132M4，YQFA97-YE160M4，YQFA97-YE180M4，YQFA97-YE200M4，YQFA97-YE80M4，YQFA97-YE90M4，YQFA97-YEJ100M4，YQFA97-YEJ112M4，YQFA97-YEJ132M4，YQFA97-YEJ160M4，YQFA97-YEJ180M4，YQFA97-YEJ200M4，YQFA97-YEJ80M4，YQFA97-YEJ90M4，YQFA97-YEJB100M4，YQFA97-YEJB112M4，YQFA97-YEJB132M4，YQFA97-YEJB160M4，YQFA97-YEJB180M4，YQFA97-YEJB200M4，YQFA97-YEJB80M4，YQFA97-YEJB90M4，YQFA97-YP100M4，YQFA97-YP112M4，YQFA97-YP132M4，YQFA97-YP160M4，YQFA97-YP180M4，YQFA97-YP200M4，YQFA97-YP80M4，YQFA97-YP90M4，YQFA97-YPB100M4，YQFA97-YPB112M4，YQFA97-YPB132M4，YQFA97-YPB160M4，YQFA97-YPB180M4，YQFA97-YPB200M4，YQFA97-YPB80M4，YQFA97-YPB90M4，YQFA97-YPE100M4，YQFA97-YPE112M4，YQFA97-YPE132M4，YQFA97-YPE160M4，YQFA97-YPE180M4，YQFA97-YPE200M4，YQFA97-YPE80M4，YQFA97-YPE90M4，YQFA97-YS100M4，YQFA97-YS112M4，YQFA97-YS132M4，YQFA97-YS160M4，YQFA97-YS180M4，YQFA97-YS200M4，YQFA97-YS80M4，YQFA97-YS90M4，YQFA97-YVB100M4，YQFA97-YVB112M4，YQFA97-YVB132M4，YQFA97-YVB160M4，YQFA97-YVB180M4，YQFA97-YVB200M4，YQFA97-YVB80M4，YQFA97-YVB90M4，YQFA97-YVP100M4，YQFA97-YVP112M4，YQFA97-YVP132M4，YQFA97-YVP160M4，YQFA97-YVP180M4，YQFA97-YVP200M4，YQFA97-YVP80M4，YQFA97-YVP90M4，YQFA97-YVPEJ100M4，YQFA97-YVPEJ112M4，YQFA97-YVPEJ132M4，YQFA97-YVPEJ160M4，YQFA97-YVPEJ180M4，YQFA97-YVPEJ200M4，YQFA97-YVPEJ80M4，YQFA97-YVPEJ90M4，F(xiàn)WA97-Y0.75KW，F(xiàn)WA97-Y1.1KW，F(xiàn)WA97-Y1.5KW，F(xiàn)WA97-Y100M4，F(xiàn)WA97-Y112M4，F(xiàn)WA97-Y11KW，F(xiàn)WA97-Y132M4，F(xiàn)WA97-Y15KW，F(xiàn)WA97-Y160M4，F(xiàn)WA97-Y18.5KW，F(xiàn)WA97-Y180M4，F(xiàn)WA97-Y2.2KW，F(xiàn)WA97-Y200M4，F(xiàn)WA97-Y22KW，F(xiàn)WA97-Y30KW，F(xiàn)WA97-Y3KW，F(xiàn)WA97-Y4KW，F(xiàn)WA97-Y5.5KW，F(xiàn)WA97-Y7.5KW，F(xiàn)WA97-Y80M4，F(xiàn)WA97-Y90M4，F(xiàn)WA97-YB100M4，F(xiàn)WA97-YB112M4，F(xiàn)WA97-YB132M4，F(xiàn)WA97-YB160M4，F(xiàn)WA97-YB180M4，F(xiàn)WA97-YB200M4，F(xiàn)WA97-YB80M4，F(xiàn)WA97-YB90M4，F(xiàn)WA97-YDP100M4，F(xiàn)WA97-YDP112M4，F(xiàn)WA97-YDP132M4，F(xiàn)WA97-YDP160M4，F(xiàn)WA97-YDP180M4，F(xiàn)WA97-YDP200M4，F(xiàn)WA97-YDP80M4，F(xiàn)WA97-YDP90M4，F(xiàn)WA97-YE100M4，F(xiàn)WA97-YE112M4，F(xiàn)WA97-YE132M4，F(xiàn)WA97-YE160M4，F(xiàn)WA97-YE180M4，F(xiàn)WA97-YE200M4，F(xiàn)WA97-YE80M4，F(xiàn)WA97-YE90M4，F(xiàn)WA97-YEJ100M4，F(xiàn)WA97-YEJ112M4，F(xiàn)WA97-YEJ132M4，F(xiàn)WA97-YEJ160M4，F(xiàn)WA97-YEJ180M4，F(xiàn)WA97-YEJ200M4，F(xiàn)WA97-YEJ80M4，F(xiàn)WA97-YEJ90M4，F(xiàn)WA97-YEJB100M4，F(xiàn)WA97-YEJB112M4，F(xiàn)WA97-YEJB132M4，F(xiàn)WA97-YEJB160M4，F(xiàn)WA97-YEJB180M4，F(xiàn)WA97-YEJB200M4，F(xiàn)WA97-YEJB80M4，F(xiàn)WA97-YEJB90M4，F(xiàn)WA97-YP100M4，F(xiàn)WA97-YP112M4，F(xiàn)WA97-YP132M4，F(xiàn)WA97-YP160M4，F(xiàn)WA97-YP180M4，F(xiàn)WA97-YP200M4，F(xiàn)WA97-YP80M4，F(xiàn)WA97-YP90M4，F(xiàn)WA97-YPB100M4，F(xiàn)WA97-YPB112M4，F(xiàn)WA97-YPB132M4，F(xiàn)WA97-YPB160M4，F(xiàn)WA97-YPB180M4，F(xiàn)WA97-YPB200M4，F(xiàn)WA97-YPB80M4，F(xiàn)WA97-YPB90M4，F(xiàn)WA97-YPE100M4，F(xiàn)WA97-YPE112M4，F(xiàn)WA97-YPE132M4，F(xiàn)WA97-YPE160M4，F(xiàn)WA97-YPE180M4，F(xiàn)WA97-YPE200M4，F(xiàn)WA97-YPE80M4，F(xiàn)WA97-YPE90M4，F(xiàn)WA97-YS100M4，F(xiàn)WA97-YS112M4，F(xiàn)WA97-YS132M4，F(xiàn)WA97-YS160M4，F(xiàn)WA97-YS180M4，F(xiàn)WA97-YS200M4，F(xiàn)WA97-YS80M4，F(xiàn)WA97-YS90M4，F(xiàn)WA97-YVB100M4，F(xiàn)WA97-YVB112M4，F(xiàn)WA97-YVB132M4，F(xiàn)WA97-YVB160M4，F(xiàn)WA97-YVB180M4，F(xiàn)WA97-YVB200M4，F(xiàn)WA97-YVB80M4，F(xiàn)WA97-YVB90M4，F(xiàn)WA97-YVP100M4，F(xiàn)WA97-YVP112M4，F(xiàn)WA97-YVP132M4，F(xiàn)WA97-YVP160M4，F(xiàn)WA97-YVP180M4，F(xiàn)WA97-YVP200M4，F(xiàn)WA97-YVP80M4，F(xiàn)WA97-YVP90M4，F(xiàn)WA97-YVPEJ100M4，F(xiàn)WA97-YVPEJ112M4，F(xiàn)WA97-YVPEJ132M4，F(xiàn)WA97-YVPEJ160M4，F(xiàn)WA97-YVPEJ180M4，F(xiàn)WA97-YVPEJ200M4，F(xiàn)WA97-YVPEJ80M4，F(xiàn)WA97-YVPEJ90M4，JCFA97-Y0.75KW，JCFA97-Y1.1KW，JCFA97-Y1.5KW，JCFA97-Y100M4，JCFA97-Y112M4，JCFA97-Y11KW，JCFA97-Y132M4，JCFA97-Y15KW，JCFA97-Y160M4，JCFA97-Y18.5KW，JCFA97-Y180M4，JCFA97-Y2.2KW，JCFA97-Y200M4，JCFA97-Y22KW，JCFA97-Y30KW，JCFA97-Y3KW，JCFA97-Y4KW，JCFA97-Y5.5KW，JCFA97-Y7.5KW，JCFA97-Y80M4，JCFA97-Y90M4，JCFA97-YB100M4，JCFA97-YB112M4，JCFA97-YB132M4，JCFA97-YB160M4，JCFA97-YB180M4，JCFA97-YB200M4，JCFA97-YB80M4，JCFA97-YB90M4，JCFA97-YDP100M4，JCFA97-YDP112M4，JCFA97-YDP132M4，JCFA97-YDP160M4，JCFA97-YDP180M4，JCFA97-YDP200M4，JCFA97-YDP80M4，JCFA97-YDP90M4，JCFA97-YE100M4，JCFA97-YE112M4，JCFA97-YE132M4，JCFA97-YE160M4，JCFA97-YE180M4，JCFA97-YE200M4，JCFA97-YE80M4，JCFA97-YE90M4，JCFA97-YEJ100M4，JCFA97-YEJ112M4，JCFA97-YEJ132M4，JCFA97-YEJ160M4，JCFA97-YEJ180M4，JCFA97-YEJ200M4，JCFA97-YEJ80M4，JCFA97-YEJ90M4，JCFA97-YEJB100M4，JCFA97-YEJB112M4，JCFA97-YEJB132M4，JCFA97-YEJB160M4，JCFA97-YEJB180M4，JCFA97-YEJB200M4，JCFA97-YEJB80M4，JCFA97-YEJB90M4，JCFA97-YP100M4，JCFA97-YP112M4，JCFA97-YP132M4，JCFA97-YP160M4，JCFA97-YP180M4，JCFA97-YP200M4，JCFA97-YP80M4，JCFA97-YP90M4，JCFA97-YPB100M4，JCFA97-YPB112M4，JCFA97-YPB132M4，JCFA97-YPB160M4，JCFA97-YPB180M4，JCFA97-YPB200M4，JCFA97-YPB80M4，JCFA97-YPB90M4，JCFA97-YPE100M4，JCFA97-YPE112M4，JCFA97-YPE132M4，JCFA97-YPE160M4，JCFA97-YPE180M4，JCFA97-YPE200M4，JCFA97-YPE80M4，JCFA97-YPE90M4，JCFA97-YS100M4，JCFA97-YS112M4，JCFA97-YS132M4，JCFA97-YS160M4，JCFA97-YS180M4，JCFA97-YS200M4，JCFA97-YS80M4，JCFA97-YS90M4，JCFA97-YVB100M4，JCFA97-YVB112M4，JCFA97-YVB132M4，JCFA97-YVB160M4，JCFA97-YVB180M4，JCFA97-YVB200M4，JCFA97-YVB80M4，JCFA97-YVB90M4，JCFA97-YVP100M4，JCFA97-YVP112M4，JCFA97-YVP132M4，JCFA97-YVP160M4，JCFA97-YVP180M4，JCFA97-YVP200M4，JCFA97-YVP80M4，JCFA97-YVP90M4，JCFA97-YVPEJ100M4，JCFA97-YVPEJ112M4，JCFA97-YVPEJ132M4，JCFA97-YVPEJ160M4，JCFA97-YVPEJ180M4，JCFA97-YVPEJ200M4，JCFA97-YVPEJ80M4，JCFA97-YVPEJ90M4，F(xiàn)A99-Y0.75KW，F(xiàn)A99-Y1.1KW，F(xiàn)A99-Y1.5KW，F(xiàn)A99-Y100M4，F(xiàn)A99-Y112M4，F(xiàn)A99-Y11KW，F(xiàn)A99-Y132M4，F(xiàn)A99-Y15KW，F(xiàn)A99-Y160M4，F(xiàn)A99-Y18.5KW，F(xiàn)A99-Y180M4，F(xiàn)A99-Y2.2KW，F(xiàn)A99-Y200M4，F(xiàn)A99-Y22KW，F(xiàn)A99-Y30KW，F(xiàn)A99-Y3KW，F(xiàn)A99-Y4KW，F(xiàn)A99-Y5.5KW，F(xiàn)A99-Y7.5KW，F(xiàn)A99-Y80M4，F(xiàn)A99-Y90M4，F(xiàn)A99-YB100M4，F(xiàn)A99-YB112M4，F(xiàn)A99-YB132M4，F(xiàn)A99-YB160M4，F(xiàn)A99-YB180M4，F(xiàn)A99-YB200M4，F(xiàn)A99-YB80M4，F(xiàn)A99-YB90M4，F(xiàn)A99-YDP100M4，F(xiàn)A99-YDP112M4，F(xiàn)A99-YDP132M4，F(xiàn)A99-YDP160M4，F(xiàn)A99-YDP180M4，F(xiàn)A99-YDP200M4，F(xiàn)A99-YDP80M4，F(xiàn)A99-YDP90M4，F(xiàn)A99-YE100M4，F(xiàn)A99-YE112M4，F(xiàn)A99-YE132M4，F(xiàn)A99-YE160M4，F(xiàn)A99-YE180M4，F(xiàn)A99-YE200M4，F(xiàn)A99-YE80M4，F(xiàn)A99-YE90M4，F(xiàn)A99-YEJ100M4，F(xiàn)A99-YEJ112M4，F(xiàn)A99-YEJ132M4，F(xiàn)A99-YEJ160M4，F(xiàn)A99-YEJ180M4，F(xiàn)A99-YEJ200M4，F(xiàn)A99-YEJ80M4，F(xiàn)A99-YEJ90M4，F(xiàn)A99-YEJB100M4，F(xiàn)A99-YEJB112M4，F(xiàn)A99-YEJB132M4，F(xiàn)A99-YEJB160M4，F(xiàn)A99-YEJB180M4，F(xiàn)A99-YEJB200M4，F(xiàn)A99-YEJB80M4，F(xiàn)A99-YEJB90M4，F(xiàn)A99-YP100M4，F(xiàn)A99-YP112M4，F(xiàn)A99-YP132M4，F(xiàn)A99-YP160M4，F(xiàn)A99-YP180M4，F(xiàn)A99-YP200M4，F(xiàn)A99-YP80M4，F(xiàn)A99-YP90M4，F(xiàn)A99-YPB100M4，F(xiàn)A99-YPB112M4，F(xiàn)A99-YPB132M4，F(xiàn)A99-YPB160M4，F(xiàn)A99-YPB180M4，F(xiàn)A99-YPB200M4，F(xiàn)A99-YPB80M4，F(xiàn)A99-YPB90M4，F(xiàn)A99-YPE100M4，F(xiàn)A99-YPE112M4，F(xiàn)A99-YPE132M4，F(xiàn)A99-YPE160M4，F(xiàn)A99-YPE180M4，F(xiàn)A99-YPE200M4，F(xiàn)A99-YPE80M4，F(xiàn)A99-YPE90M4，F(xiàn)A99-YS100M4，F(xiàn)A99-YS112M4，F(xiàn)A99-YS132M4，F(xiàn)A99-YS160M4，F(xiàn)A99-YS180M4，F(xiàn)A99-YS200M4，F(xiàn)A99-YS80M4，F(xiàn)A99-YS90M4，F(xiàn)A99-YVB100M4，F(xiàn)A99-YVB112M4，F(xiàn)A99-YVB132M4，F(xiàn)A99-YVB160M4，F(xiàn)A99-YVB180M4，F(xiàn)A99-YVB200M4，F(xiàn)A99-YVB80M4，F(xiàn)A99-YVB90M4，F(xiàn)A99-YVP100M4，F(xiàn)A99-YVP112M4，F(xiàn)A99-YVP132M4，F(xiàn)A99-YVP160M4，F(xiàn)A99-YVP180M4，F(xiàn)A99-YVP200M4，F(xiàn)A99-YVP80M4，F(xiàn)A99-YVP90M4，F(xiàn)A99-YVPEJ100M4，F(xiàn)A99-YVPEJ112M4，F(xiàn)A99-YVPEJ132M4，F(xiàn)A99-YVPEJ160M4，F(xiàn)A99-YVPEJ180M4，F(xiàn)A99-YVPEJ200M4，F(xiàn)A99-YVPEJ80M4，F(xiàn)A99-YVPEJ90M4，F(xiàn)A97SF80，F(xiàn)A97SF90，F(xiàn)A97SF100，F(xiàn)A97SF112，F(xiàn)A97SF115，F(xiàn)A97SF140，F(xiàn)A97SF160，F(xiàn)A97SF190。

FA99減速器生產(chǎn)工廠展示：看廠請聯(lián)系微信13827261050，獲取位置，需提前一天預(yù)約http://m.jsshenhu.com/product/list-faxiliejiansuji-cn.html

推薦類似型號：F99減速機(jī)