3-Biased Slider Crank

3-Biased Slider Crank - connecting the crank to the ground;...

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Example 3-9.2 Slider-Crank Quick Return for Specified Time Ratio. Problem: Design a slider-crank to provide a time ratio of 1:1.25 for the slider motion. Solution: 1. Calculate ± , ² , and ³ using equations 3.1 and 3.2 from the textbook; i.e., T R = + = 360 (3.1) = 180 ² == 180 ² ´ (3.2) In this example, = 160 o , = 200 o , and = 20 o 2. Choose reasonable values for the lengths of the crank, L 2 , and coupler, L 3 . In this example, we choose L 2 = 1.0 and L 3 = 2.5. 3. Construct the triangle B 1 O 2 B 2 as shown in Figure (a). O 2 is the position of the pin joint
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Unformatted text preview: connecting the crank to the ground; the line passing through B 1 B 2 represents the ground (or parallel to the ground); B 1 and B 2 represent the pin joint on the slider in its two limit positions. The bias (offset) a can be determined from the figure or it can be determined analytically. 4. Complete the design of the mechanism as shown in Figure (b). L 3 L 2 L 3 + L 2 O 2 B 2 B 1 a (a) B 2 B 1 A 1 A 2 O 2 (b)...
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