3.1.14 Calculation of the drawback To pull the moving jaw against the toggle bar, the drawback...

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3.1.14 Calculation of the drawback To pull the moving jaw against the toggle bar, the drawback is required. Now, the springs used have to be checked under consideration of the loads required to avoid a failure of the machine. a) toggle bar b) drawback (tension rod with spring) Min. operation load: Max. operation load: Shear modulus: Number of Springs: Spring data: mowing jaw Figure 11: Drawback Fop,min = 5500 N Fop,max = 10000 N G = 83000 N/mm 2 (one at each side) D-548 Material Wire diameter: Coil diameter: External diameter: Nominal spring load: Nominal loaded length: Unloaded length: EN 10270-1 d = 12 mm Dm = 63 mm De = 75 mm Fn = 6774 N Ln 71.94 mm Lo = 100 mm n = 3.5 Number of active coils: Determine the spring rate for the springs, the loaded length for the two operation conditions Fop,min and Fop,max and check if the springs can be taken! Calculate the stresses in the wire of the spring for the given load scenario. 3.1.14 Calculation of the drawback To pull the moving jaw against the toggle bar, the drawback is required. Now, the springs used have to be checked under consideration of the loads required to avoid a failure of the machine. a) toggle bar b) drawback (tension rod with spring) Min. operation load: Max. operation load: Shear modulus: Number of Springs: Spring data: mowing jaw Figure 11: Drawback Fop,min = 5500 N Fop,max = 10000 N G = 83000 N/mm 2 (one at each side) D-548 Material Wire diameter: Coil diameter: External diameter: Nominal spring load: Nominal loaded length: Unloaded length: EN 10270-1 d = 12 mm Dm = 63 mm De = 75 mm Fn = 6774 N Ln 71.94 mm Lo = 100 mm n = 3.5 Number of active coils: Determine the spring rate for the springs, the loaded length for the two operation conditions Fop,min and Fop,max and check if the springs can be taken! Calculate the stresses in the wire of the spring for the given load scenario.

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In the given problem you are tasked with determining the spring rate also known as spring constant or stiffness for a set of springs and evaluating wh... View the full answer