| 单词 | bottom dead centre |
| 释义 | > as lemmasbottom dead centre bottom dead centre n. a point in the cycle of a reciprocating engine, compressor, etc., when a piston is nearest the crankshaft and the corresponding crank is in line with its connecting rod (and therefore exerting no torque; cf. dead point n.); the position of the crank or piston at this point; (also) the point in pedalling a bicycle when one of the pedals is in the lowest position. ΚΠ 1873 H. Evers Steam & Steam Engine iii. 60 When the top or bottom dead centre is reached there is no reason why it [sc. the crank] should not remain there; but the action of the fly wheel then shows itself. 1935 Philos. Trans. (Royal Soc.) A. 234 507 The auxiliary valve..was completely closed when the piston reached bottom dead centre. 1977 Pop. Sci. June 183/1 A treadle bike..avoids the narrow leverage angles near top and bottom dead centre of the usual rotary sprocket, where leg power is wasted. 2015 A. Rao Sustainable Energy Conversion for Electr. & Coproducts vi. 192 Gas exchange..occurs near the bottom dead center of each stroke. < as lemmas |
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