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In the double reduction gear train shown shaft a is driven by a motor attached by a flexible coupling attached to the overhang The motor provides a torque of 2500 lbf in at a speed of 1200 rpm

In the double-reduction gear train shown, shaft a is driven by a motor attached by a flexible coupling attached to the overhang. The motor provides a torque of 2500 lbf · in at a speed of 1200 rpm. The gears have 20o pressure angles, with diameters shown on the figure. Use an AISI 1020 cold-drawn steel. Design one of the shafts (as specified by the instructor) with a design factor of 1.5 by performing the following tasks.

(a) Sketch a general shaft layout, including means to locate the gears and bearings, and to transmit the torque.

(b) Perform a force analysis to find the bearing reaction forces, and generate shear and bending moment diagrams.

(c) Determine potential critical locations for stress design.

(d) Determine critical diameters of the shaft based on fatigue and static stresses at the critical locations. (e) Make any other dimensional decisions necessary to specify all diameters and axial dimensions. Sketch the shaft to scale, showing all proposed dimensions.

(f) Check the deflection at the gear, and the slopes at the gear and the bearings for satisfaction of the recommended limits in Table 7–2.

(g) If any of the deflections exceed the recommended limits, make appropriate changes to bring them all within the limits.

Table 7–2

Typical Maximum Ranges for Slopes and Transverse Deflections

Tapered roller

0.0005–0.0012 rad

Cylindrical roller

0.0008–0.0012 rad

Slopes

Deep-groove ball

0.001–0.003 rad

Spherical ball

0.026–0.052 rad

Self-align ball

0.026–0.052 rad

Uncrowned spur gear

<0.0005 rad

Transverse deflections

Spur gears with P < 10 teeth/in

0.010 in

Spur gears with 11 < P < 19

0.005 in

Spur gears with 20 < P < 50

0.003 in

 

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Jun 24 2020 View more View Less

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