Crank-Rocker 4-Bar Mechanism

Grashof crank-rocker linkage (r₁=2, r₂=4, r₃=3.5, r₄=5 m) — satisfies Grashof condition (s+l=7 ≤ p+q=7.5); sweeps the Freudenstein equation through 360° crank rotation to trace the 69.8° rocker oscillation and both toggle positions.

Category: mechanism · Difficulty: Advanced

Solution

DOF=1 (Grubler: 3*(4-1)-2*4=1). Grashof crank-rocker (s+l=7.0 < p+q=7.5). Engine detects underconstrained system and runs kinematic loop-closure solver; no static reactions are computed. Claiming reaction forces would be physically incorrect.

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All reaction values are computed by the StatIQ structural engine, not generated text. Signs follow the solver's convention: a positive R_y acts upward, a negative R_y downward; a positive M is counter-clockwise.