Report on Machine Elements in Mechanical Design

        A drive for the system to crush coal and deliver it by conveyers to a rail car is shown below; gear A deliver 15KW to the crusher and Gear E delivers 7.5Kw to conveyers or, all power enters through Gear C. The shaft carrying Gear A, C, and E rotates at 480rpm, the distances from the middle of each bearing to the middle of the face of the nearest gear is 100m. Design Shaft Diameters.

Solution

Given Data:

Gear A power deliver to crusher = 15KW

Gear E delivers to conveys = 7.5KW

Speed = 480rpm

Distance = 100m

Power at gear C = power to crusher (15KW); + power to conveyer (7.5KW)

22.5KW = 22.5 N.m/s

Supposed:

= 3.0 for all shaft diameters

= 0.81 for 0.99 reliability

= 0.80

N= 4; due to impact and shook of coal crusher

= 400MPa

To Find:

Calculate the minimum diameters for Shaft 1 

From problem 1, after calculating the minimum diameters for the shaft, let’s specify the following dimensions for design of shaft.

 Specify suitable single row, deep grove ball bearings from Table 14-3 for the shaft of examples 12-3 use the data which is solved in above examples;