Answer :
Final answer:
To design a fourbar Grashof crank-rocker, we need to consider the geometric constraints and kinematic equations. The toggle positions and minimum transmission angle can be determined by building a model.
Explanation:
To design a fourbar Grashof crank-rocker with 90° of output rocker motion and a quick return ratio of 1:1.4, we need to consider the geometric constraints and kinematic equations of the mechanism. The Grashof criterion states that in order for the mechanism to achieve the desired motion, the sum of the shortest and longest links must be less than or equal to the sum of the other two links. Additionally, the quick return ratio is defined as the ratio of the time taken in the forward stroke to the time taken in the return stroke. In a crank-rocker mechanism, the toggle positions are the extreme positions of the rocker and the minimum transmission angle is the smallest angle between the crank and rocker. Building a physical model of the mechanism can help determine these values.
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