【20160406】Kinematic inversion
N! B, a1 u% R; u運動倒置. E: z6 h- T3 r. N% N/ G6 n0 X
0 M: d. h1 a ~' ? U5 mThe cam will be imagined as being stationary., K" `! m1 S1 y& N7 M7 n; M
The follower then should be rotated opposite to the direction of cam rotation.
) U' ?+ J& e! L+ C- a* \+ qThe desired location for the follower, at several positions, is constructed from the base circle.' Z- y% Z8 U" G' |9 r
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。6 t1 s: T( L# y
7 @- A, G. W% Z3 \
To creating the cam shape: wrapping the displacement diagram around the base circle.
+ c5 M0 D, e, X5 J2 N, C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。
5 h: s/ {+ \* K' n$ t
未命名圖片.png (33.9 KB, 下載次數: 78)
下載附件
保存到相冊
2016-4-6 20:43 上傳
5 L4 J9 U( V8 `3 v, c
( f e- H! R# U# |# B1 e V具體例子:
5 T0 Y& J8 ]" k G" P( D% E3 [① In-Line Knife-Edge Follower 對心直動尖頂從動件凸輪
8 U5 h8 X3 P1 C$ {# g2 M
Cha 07-2016.jpg (46.82 KB, 下載次數: 80)
下載附件
保存到相冊
2016-4-6 20:46 上傳
Cha 07-2016.jpg (18.61 KB, 下載次數: 79)
下載附件
保存到相冊
2016-4-6 20:46 上傳
& u, F+ ^. ]3 U* p# t; t
1. Draw the base circle of radius.) y I. c2 i0 J9 U+ ]' d
2. Draw the follower in the home position.
" b7 {/ X9 E' _* z ]. ]$ t4 d; X3. Draw radial lines from the center of the cam, corresponding to the cam angles identified on the displacement diagram.
* o1 T9 I6 |) b1 r& z) O# e. l0 ^# t5 r4. The follower will be rotated in a direction opposite to the actual cam rotation.1 }; D( P9 U* J6 ^! @
5. Transfer the displacements from the displacement diagram to the radial lines.
1 O3 w) v& k. K s$ e0 o' E# H6. Measure the displacements from the base circle.
( ], @$ s) h$ k- D; j e5 i: S5 j/ V+ E2 a+ b
1.畫出制定半徑的基圓。$ z0 \& }7 i+ z* p! t* p
2.畫出初始位置的從動件。
4 y5 e8 C: v4 w+ l. A; a2 t, 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。
s. l% S2 q$ R N/ d4.從動件與凸輪真實運動方向相反。
: h+ q9 K; j/ d: y$ U5.將位移移到徑向線上。: v ]+ F/ o. X! t- y- u
6.測量從動件遠離凸輪基圓的距離。6 |4 ]5 i% {5 ~! e9 l# x
( n+ W: \+ K- i, q {$ D+ A1 x
② Offset Roller Follower 偏置滾輪從動件
2 c$ }1 X! _4 j
Cha 07-2016.jpg (73.04 KB, 下載次數: 79)
下載附件
保存到相冊
2016-4-6 20:54 上傳
Cha 07-2016.jpg (18.43 KB, 下載次數: 85)
下載附件
保存到相冊
2016-4-6 20:54 上傳
. y. P8 C5 P. s6 B3 i9 j& J1. Draw the base circle of radius.
( N1 Z! c* h& s% n' T' S | G2. Draw the follower centerline in the home position.
$ H' W) A& }" o) [. |3. Draw the prime circle.& G% T) H3 ^% Z2 D
4. Draw the follower in the home position of radius.: _7 N1 _5 s# I/ e$ O# ?/ ]
5. Draw an offset circle of radius, which will be tangent to the follower centerline.3 V: _) y# N6 M3 l$ _* D
6. Draw lines tangent to the offset circle, corresponding to the reference cam angles on the displacement diagram.
- c# h( O6 R, f# Y; s; ?7. The follower will be rotated in a direction opposite to the actual cam rotation.
4 z. P" [' R$ A! Z- g9 D& G4 v
' O2 }, v) e4 Q5 h0 Y& E1.畫出制定半徑的基圓。
) i3 u( E. s' q( m- {2.畫出初始位置的從動件中心線。* _$ E( E* l' g5 ~
3.畫出理論廓線。
% h8 Q4 [! F) D; z% N4 @8 D" P4.畫出初始位置的從動件。
/ v7 ^. c* ]2 g& z* H$ L5.以偏心距為半徑畫圓,與從動件中心線相切。* `0 P) [; K. V" Q5 f0 B2 p
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。: ]) A4 G( H; v- U. h5 W
7.從動件與凸輪真實運動方向相反。3 {! M& U* E7 q
|