【菜鳥(niǎo)成長(zhǎng)記】20歲后，我在機(jī)械的每一天

の小南灬

看看，加油

zqphho999

也想進(jìn)步。

黑森林的鹿

【20160412】Involute Tooth Profile
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2 Z+ k+ e! |, WAn involute shape is constructed by unwinding a taut wire from a base circle with diameter db.
& E' Z+ d# m, ~& Y漸開(kāi)線由直徑為db的基圓上解開(kāi)一條拉線形成。
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) f& \6 u# k" N) ^“Taut wire” is always tangent to base circle and normal to involute.
* |( ^0 a% n6 U" B* L“拉線”總與基圓相切，垂直于漸開(kāi)線。

2 q/ `  p  g8 x& ~The center of curvature of the involute is always at the point of tangency of the “taut wire” with the base circle.
曲率中心總在基圓與拉線切點(diǎn)處。
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- I* W+ A9 w4 _4 QAny portion of tooth profile inside the base circle is not an involute.
基圓以內(nèi)無(wú)漸開(kāi)線。
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. g3 M6 n* T, ^Involute profile provide the constant velocity ratio.
8 c4 X3 a/ n  d- o% v+ [2 t, e漸開(kāi)線能保證速度比恒定。
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黑森林的鹿

の小南灬 發(fā)表于 2016-4-11 21:18
看看，加油

恩吶~

黑森林的鹿

zqphho999 發(fā)表于 2016-4-12 19:50
0 t- k9 T# ]) y也想進(jìn)步。

共同進(jìn)步！
0 m5 K. L2 U8 h! [  S1 _& _

黑森林的鹿

【20160413】Standard Gears

Any two involute gears with the same diametral pitch and pressure angle will mate.
) C* x* o( G. g- d  A徑節(jié)和壓力角相同的漸開(kāi)線齒輪可以配合。

Gear teeth have been standardized based on the diametral pitch and pressure. Standard pressure angles are

9 m' x& Z0 h& W  E6 R齒輪的齒以徑節(jié)和壓力為基準(zhǔn)進(jìn)行標(biāo)準(zhǔn)化。標(biāo)準(zhǔn)壓力角如圖。
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4 C) O6 ~' }8 Z. p# o+ Z6 GThe standardized values of diametral pitch：
7 X# W. i! k1 c+ ]. v- p( l標(biāo)準(zhǔn)徑節(jié)值如下表：
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& w1 ^3 K5 r4 F6 P) O9 kThe manufacturers must follow a standard convention to form the details of the gear tooth profile. The AGMA is the primary organization that oversees this standardization scheme.
齒輪齒廓的加工必須遵循一定規(guī)則，美國(guó)齒輪制造協(xié)會(huì)首先制定相關(guān)規(guī)定。

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黑森林的鹿

【20160414】Relationships of Gears in Mesh

Center Distance

/ K, Y0 x) Y. b2 W, f+ W! W- uPinion-the smaller gear  小齒輪
Bull gear or gear -the larger gear  大齒輪
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+ L. |: [! o7 E5 N& I* P$ {Contact ratio( mp ): the average number of teeth that are in contact at any instant.
3 }, C2 H3 w0 z+ E6 k重合度：任意時(shí)刻相互接觸的齒數(shù)。

where
3 z: ?6 D+ `2 W4 {6 YZ -The length of the contact path( length of straight line）
pb-The base pitch, which is defined as the distance between corresponding points of adjacent teeth, measured on the base circle( length of arc )
嚙合度=接觸長(zhǎng)度（直線長(zhǎng)度）/節(jié)距（弧線長(zhǎng)度）

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" M5 z7 K6 {0 F) r# c5 J! H( i) zAn involute shape is constructed by unwinding a taut wire from a base circle.
漸開(kāi)線的形成方式?jīng)Q定了直線段KN與弧線段AN的長(zhǎng)度相等。
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4 `0 \2 g7 M7 mInpractice, contact ratios should be greater than 1.2.
1 O) I- \) l' |' V0 q實(shí)際應(yīng)用中，重合度應(yīng)大于1.2。
: g" m( {, ]% Z& X0 c8 dA contact ratio of 1.2 indicates that one pair of teeth is always in contact and a second pair of teeth is incontact 20 percent of the time.
9 o/ P/ u3 G% o( m" ]重合度為1.2意味著，一對(duì)齒總是接觸，第二對(duì)齒有20%的時(shí)間接觸。
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黑森林的鹿

【20160415】Interference
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dedendum circle > base circle

- }! l: j$ v1 r% H9 kdedendum circle < base circle

$ l7 p+ b  M4 s! q& T2 R6 O- r% xGear teeth have involute profiles between the base circle and the addendum circle. When a gear with few teeth and small pressure angles is constructed, the dedendum circle is considerably smaller than the base circle of the involute. Therefore, the tooth between the base circle and the dedendum is not an involute.
基圓與齒頂高間的齒具有漸開(kāi)線齒廓。當(dāng)齒輪的齒數(shù)過(guò)少并且壓力角很小時(shí)，齒根高遠(yuǎn)小于形成漸開(kāi)線的基圓。因此，基圓與齒根高間的齒不是漸開(kāi)線齒輪。
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  F! c. _, p* d8 i: rInterference：If the mating gear tooth were to contact the non-involute portion of the tooth, the fundamental condition for constant velocity ratio would be violated.
% `3 S0 |  P" m干涉：配合的齒輪在非漸開(kāi)線處接觸時(shí)，常速定理不滿足。
. `  C: G1 A/ n3 idrastic noise, vibration, and wear 不利：噪音，速度突變，磨損
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; Y/ H6 u7 W; fTo avoid interference，the maximum number of gear teeth is given as
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為避免干涉，最大齒數(shù)應(yīng)滿足如上公式。
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cwyyyy

20歲 與題主共勉

垨護(hù)伱の噯

樓主好強(qiáng)大  加油   我比樓主大好多但是沒(méi)你條件好 幼兒園畢業(yè) 然后再家放牛到15歲 15歲半近機(jī)械廠摸爬滾打數(shù)十載，現(xiàn)在26了 工資5000塊 礦山設(shè)備行業(yè)，期間做個(gè)，鏜，銑  車，焊接，鑄造 鍛造，完全 自學(xué) 唯一花錢學(xué)的東西就是UG數(shù)控還沒(méi)學(xué)會(huì) 制圖會(huì)了  從原材料做到現(xiàn)在的整機(jī)，，好艱辛 ，哎看看你們都是大學(xué)生，想想我的前途都蛋疼 都不敢跟你們說(shuō)我還有夢(mèng)想了