Giaùo Trình CÔ HOÏC ÖÙNG DUÏNG CHÖÔNG 9 TRUÏC VAØ OÅ ÑÔÕ 206 Baûng 97 Trò soá

Giaùo trình cô hoïc öùng duïng chöông 9

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Giaùo Trình CÔ HOÏC ÖÙNG DUÏNG CHÖÔNG 9. TRUÏC VAØ OÅ ÑÔÕ 206 Baûng 9.7 Trò soá heä soá taûi troïng ñoäng K ñ Tính chaát cuûa taûi troïng taùc duïng leân oå K ñ Thí duï Taûi troïng eâm, khoâng va ñaäp. 1 OÅ trong truyeàn ñoäng ma saùt (ñai, baùnh ma saùt), truyeàn ñoäng coù noái truïc ñaøn hoài, truïc truyeàn chung loaïi nhoû. Taûi troïng coù va ñaäp nheï, quaù taûi tôùi 125% so vôùi taûi thöôøng 1 ÷ 1,2 OÅ trong truyeàn ñoäng baùnh raêng chòu taûi eâm; trong maùy caét kim loaïi coù chuyeån ñoäng chính quay troøn; ôû trong ñoäng cô ñieän, quaït gioù, baêng taûi, maùy vaän chuyeån,… Taûi troïng coù va ñaäp trung bình, quaù taûi tôùi 150% so vôùi taûi bình thöôøng 1,3 ÷ 1,8 OÅ trong hoäp toác ñoä cuûa oâtoâ vaø maùy keùo, cô caáu quay vaø di chuyeån caàn truïc, hoäp giaûm toác (K ñ = 1,3 ÷ 1,5). OÅ baùnh oâtoâ vaø maùy keùo, oå ñoäng cô ñoát trong, maùy baùo vaø maùy xoïc (K ñ = 1,5 ÷ 1,8) Taûi troïng coù va ñaäp vaø chaán ñoäng maïnh, quaù taûi tôùi 200% so vôùi taûi bình thöôøng. 1,8 ÷ 2,5 OÅ truïc caùn cuûa maùy caùn loaïi trung bình, oå maùy nghieàn quaëng vaø ñaù, maùy reøn loaïi nhoû. Taûi troïng coù va ñaäp maïnh quaù taûi tôùi 300% so vôùi taûi bình thöôøng. 2,5 ÷ 3 OÅ truïc caùn cuûa maùy caùn loaïi naëng, oå maùy buùa loaïi naëng, maùy cöa. Baûng 9.8 Trò soá heä soá vaän toác K n n/n gh K n n/n gh K n n/n gh K n 1 1 1,7 0,49 2,4 0,19 1,1 0,92 1,8 0,43 2,5 0,16 1,2 0,83 1,9 0,38 2,6 0,14 1,3 0,75 2,0 0,33 2,7 0,12 1,4 0,68 2,1 0,29 2,8 0,12 1,5 0,62 2,2 0,25 2.9 0,9 1,6 0,55 2,3 0,22 3,0 0,9
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