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【20160419】Spur Gear Selection e7 ~# i% b: X
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Because the majority of gears in operation are AGMA standard, the designer only needs to determine the key parameters. These parameters are the diametral pitch, pressure angle, and number of teeth on each gear.6 ?' ?% n( g; L3 E
齒輪選擇的標(biāo)準(zhǔn):徑節(jié),壓力角,齒數(shù)。
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Diametral Pitch:$ I8 {; Z+ g$ Y# q: w9 j5 V; C
An estimate of suitable diametral pitch can be made with knowledge of the nominal power that is transmitted by the gear pair, the rotational speed of the pinion, and the gear material.
- F( v" ?5 a* i已知正壓力、小齒輪轉(zhuǎn)速和齒輪材質(zhì)后,可對(duì)徑節(jié)進(jìn)行預(yù)估。
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The standard values of pressure angles are 141⁄2°, 20°, and 25°. Gears with pressure angles of 20° are well suited for general applications. Gears with pressure angles of 25°can be smaller without a concern for interference but have less efficient force transmission. Therefore, they are best suited for high-speed and lower-power applications.' |3 Q" a! A& E4 E
壓力角的標(biāo)準(zhǔn)值為 141⁄2°, 20°和 25°。20°對(duì)大多數(shù)情況適用。 25°干涉不明顯但傳遞效率降低。因此并不十分適合高速低能場合。
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Number of Teeth:" Z$ T) Z$ P& c( K( v! w
In general, smaller gears are preferred because they minimize size, weight, and cost. The minimum size is determined by interference criteria.* d& m' o9 L7 Q5 b
齒越小,齒輪尺寸、重量和花費(fèi)也就更小。最小尺寸由干涉定律決定。# C- D& B' W" q
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