17 springs - ME250 Design and Manufacturing I Springs...

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Springs ME250 Design and Manufacturing I
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2 What? Why? Types of springs Nomenclature Types of ends Spring stiffness Stress in springs Strength of springs Natural frequency & resonance Summary Outline
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3 Flexible element used to exert a force or a torque and, at the same time, to store energy What?
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4 What? Force can be linear or radial
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5 Transform kinetic energy to potential energy Can be used to absorb undesired motion/impact Why?
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6 Transform stored potential energy to kinetic energy Stored potential energy can be released as force/torque at a later time Why?
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7 Types of springs Compression helical(coil) spring
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8 Extension helical(coil) springs Types of springs
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9 Flat (cantilever) spring Types of springs
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10 Volute spring Types of springs
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11 Flat spiral spring Types of springs
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12 Torsion coil spring Types of springs
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13 Leaf spring Types of springs
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14 Belleville spring Types of springs
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15 Torsion bar Types of springs
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16 D m = mean coil diameter d = wire diameter D o = D m +d = Outside diameter D i = D m -d = Inside diameter N t = Number of coils L 0 = Free length L s = Solid length p = Pitch Nomenclature p D m
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17 Compression springs Type of ends affect number of active coils, N a (< N t ) Types of ends Plain end, right hand N a = N t Squared and ground end, left hand N a = N t -2 Squared or closed end, right hand N a = N t -2 Plain end, ground, left hand N a = N t -1
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18 Compression springs Formula for compression spring dimensions (Table 10-1 in course pack p. 236) Types of ends
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19 Extension springs Types of ends Machine half loop-open Raised hook Full twisted loop Short twisted loop
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20 A measure of the resistance offered by an elastic body Anything is spring, but normally very stiff Winding reduces stiffness Spring stiffness L 0 L 0 + δ L 0 - δ F F F F F k
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