Exam (elaborations) MECHANISM

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解題助教：余承翰 研究室：91805 分機號碼：62231-17

1. [10%] For the mechanism shown below, please
(a) [4%] complete the skeleton drawing with complete labeling,
(b) [6%] determine the mobility, with specifying number of links, the type of each joint, and
count the number of each type of joints.




Pin in slot



Figure 1-1
(a)




Figure 1-2
(b)

m  3  (n  1)  2 j1  j2

n = 12[1]

j1 = 15

j2 = 1

Turning pair: A, B, D, E, F, G, H, I, J, K, M, N, O, P[1]

Sliding pair: C[1]

Cam pair: L[1]

Mobility: m  3(n  1)  2 15  1  2 [2]

, 2. [10%] For the mechanism shown below. r2  17 , r3  19 , r4  23 , o2  (12 3,0) , o4  (0,12) .If

you are only allowed to move O2 horizontally (in the negative X direction) and move O4 vertically
(in the negative Y direction) by a same amount Q, please analyze for the type of the four-bar
mechanism, according the value of Q.




Figure2-1


17  r1  19  23

r1  25

17  23  r1  19 [1]

r1  21

r1  23  17  19 [1]

r1  13

21  r1  25 : crank-rocker mechanism

13  r1  21 : triple-rocker mechanism

0  r1  13 :double-rocker mechanism


o2o4  24


(12  Q)2  (12 3  Q)2  21 [1]

Q  2.2075

(12  Q)2  (12 3  Q)2  13 [1]