Answer :

Final answer:

To design a four-bar Grashof crank-rocker mechanism with 90 degrees of output rocker motion and no quick return, we need to satisfy the Grashof criterion and choose appropriate link lengths.

Explanation:

To design a four-bar Grashof crank-rocker mechanism with 90 degrees of output rocker motion and no quick return, we need to consider the parameters and constraints of the mechanism. The Grashof criterion states that for a four-bar mechanism to exhibit a 90-degree rocker motion, the sum of the shortest and longest link lengths should be less than or equal to the sum of the other two link lengths. In this case, we can choose link lengths to satisfy this criterion and achieve the desired motion.

For instance, assuming the shortest link length is 1 unit, we can choose the second shortest link length to be 2 units. The sum of the shortest and longest link lengths would be 3 units, and the sum of the other two link lengths would be 4 units. Therefore, the Grashof criterion is satisfied.

By properly locating the input and output links, and selecting appropriate link lengths, we can design a four-bar Grashof crank-rocker mechanism that exhibits 90 degrees of output rocker motion without a quick return.

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