【20160406】Kinematic inversion% `* H, _5 w I+ b( L, J/ {
運動倒置
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The cam will be imagined as being stationary.
9 D( n1 F# A8 i6 a# rThe follower then should be rotated opposite to the direction of cam rotation. [4 h9 ]7 P! _, B8 g
The desired location for the follower, at several positions, is constructed from the base circle.
: D C" r& o- { E假定凸輪不動,,從動件沿相反方向轉動,,在基圓上畫出從動件的幾個預期運動位置。0 p5 Y& Z- o0 K5 h0 b) g
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To creating the cam shape: wrapping the displacement diagram around the base circle.; J3 Y6 z) G$ H/ n- t1 B% G' F
設計凸輪形狀時,,用從動件位移圖上的位移將基圓“包裹”起來,。
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具體例子:
" G4 g5 ~7 E# ^, {% L$ H$ O① In-Line Knife-Edge Follower 對心直動尖頂從動件凸輪
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$ d% D2 U4 z1 U* m2 F1. Draw the base circle of radius.6 E! y( ~7 ~8 L# @$ I) D4 A4 U0 j
2. Draw the follower in the home position.
, ~3 M# }+ ~9 Q X1 M, ^+ O3. Draw radial lines from the center of the cam, corresponding to the cam angles identified on the displacement diagram.* f4 s% I, ~- [
4. The follower will be rotated in a direction opposite to the actual cam rotation.0 c4 q. u M, U! ]$ |/ r' r( z
5. Transfer the displacements from the displacement diagram to the radial lines.. U' m6 o$ N5 V/ i5 S
6. Measure the displacements from the base circle.8 [5 |9 j( ]3 `- G- ~
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1.畫出制定半徑的基圓。
, i8 F0 [) \# Y8 P/ ]2.畫出初始位置的從動件,。
) D* \( Y0 M! u8 O3.從中心畫出基圓的徑向線,,角度與位移圖上橫軸凸輪角度相對應。
[/ E( D% l0 e4 y6 G5 a! b4 u4.從動件與凸輪真實運動方向相反,。
' T/ `( ` \. ^! O1 l$ W% ^5.將位移移到徑向線上,。. ~2 D" u1 [$ O& I
6.測量從動件遠離凸輪基圓的距離。* t! |: _6 D1 c6 d' y" ~( [5 K. M
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② Offset Roller Follower 偏置滾輪從動件
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1. Draw the base circle of radius.
9 o$ ^) \( E/ E6 @6 {) `! U2. Draw the follower centerline in the home position.
* z# F* Q' C8 \3. Draw the prime circle.
' A5 g1 Z. ]6 H5 G2 k4. Draw the follower in the home position of radius.
4 e0 {/ g7 f( l5. Draw an offset circle of radius, which will be tangent to the follower centerline.) t: U2 I" I5 g" T+ Y- j
6. Draw lines tangent to the offset circle, corresponding to the reference cam angles on the displacement diagram.
: ^0 ]5 n w: l0 _4 F7. The follower will be rotated in a direction opposite to the actual cam rotation. n V& w: r' J! S4 a
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1.畫出制定半徑的基圓,。
! G0 g, ]" i5 s6 K2 t2.畫出初始位置的從動件中心線,。
& l8 L- l6 G0 b: \3.畫出理論廓線。+ p- }( }1 g; v
4.畫出初始位置的從動件,。
5 F1 Y% l) v8 k4 s) a5.以偏心距為半徑畫圓,,與從動件中心線相切。. H& k7 `- ^! g
6.與偏距圓相切畫線,,角度與位移圖上橫軸凸輪角度相對應,。
* v3 c( C6 R8 O7.從動件與凸輪真實運動方向相反。
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