For question 1 thru 5 assume a 4-bar mechanism wher; S: is the shortest link P:

Question

For question 1 thru 5 assume a 4-bar mechanism wher; S: is the shortest link P: is the other link L: is the longest link Q: is a 4th link Using Grashof law mathematically state the Grashof condition of a 4-bar mechanism if it is (Use above terminology) A Grashof mechanisms: A non-Grashof mechanisms: Mathematically determine the degrees of freedom of such a law mechanisms using the terminology above: Name the type of 4-bar mechanism that would result from a Grashof mechanisms inversions if the short link is the __________ then the mechanism is: Ground link ______________ The side link ______________ The coupler _____________________

Explanation / Answer

a) for a Grashof mechanisms : S+L < P+Q

for a non-Grashof mechanisms : S+L >P+Q

b) for a planar 4 bar mechanism

degree of freedom =3 (no of links)-2(no of joints)-3(no of grounded links)

=3*4-2*4-3 = 12-8-3=1 (no of links= 4,no of joints = 4,no of grounded links = 1

c) for 4 bar grashof mechanism

shortest link is ground link then mechanism is crank-crank

shortest link is side link then mechanism is rocker-crank

shortest link is coupler then mechanism is double rocker

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