Business Management

Author: Haroon Khalil

  • UNIVERSAL JOINT

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    Haroon Khalil
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    To accommodate misalignment between mating shafts for more than the 3°, a universal joint is used. Angular misalignments of up to 45° are possible at low rotational speeds with single universal joints. It consists of two yokes, a centre bearing block, and two pins that pass through the block at right angles. Approximately 20° –…

  • FLEXIBLE BUSHED COUPLING

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    Haroon Khalil
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    In a rigid coupling, the torque is transmitted from one half of the coupling to the other through the bolts and in this arrangement shafts need be aligned very well. However, in the bushed coupling the rubber bushings over the pins (bolts) (as shown in Figure 16.2) provide, flexibility and can accommodate, some misalignment. Because of…

  • RIGID COUPLING

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    Haroon Khalil
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    Rigid couplings are designed to draw two shafts together tightly so that no relative motion can occur between them. This design is used for some special kinds of equipment in which precise alignment of two shafts is required. In such cases, the coupling must be capable of transmitting the torque in the shafts. Rigid couplings…

  • INTRODUCTION TO COUPLING

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    Haroon Khalil
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    The term coupling is a device used to connect two shafts together at their ends for transmitting the power. There are a number of coupling devices used to couple two shafts but in this chapter only few important couplings have been introduced for understanding of the students. There are two general types of couplings:

  • Sun and Planet Gear

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    Haroon Khalil
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    When an annular gear A is used in epicyclic gear train, it is known as sun and planet gear train. The annular wheel meshes with wheel P and rotates as sun and planet gear as shown in Figure 15.28. The wheel S and P are, generally called the sun and the planet wheels, respectively due to analogy…

  • Planetary or Epicyclic Gear Train

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    Haroon Khalil
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    If the axis of at least one gear in gear train moves relative to fixed axis or frame, such type of gear train is known as epicyclic gear train. In this gear train, one gear rotates over pitch circle of other gear as shown in Figure 15.27. Consider two gear wheels P and Q, the axes of…

  • Reverted Gear Train

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    Haroon Khalil
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    If axes of the first and the last wheels of a compound gear coincide, it is called reverted gear train. Example 15.9: In a reverted gear train, speed ratio is 10 as shown in Figure 15.26. The module of gear 1 and 4 is 3 mm and module of gear 2 and 3 is 2 mm. Calculate the…

  • Compound Gear Train

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    Haroon Khalil
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    When two or more gears rotate about same axis and have same angular velocity, it is known as compound gear train. Figure 15.25 shows the example of compound gear train. Figure 15.25 Compound Gear Train Example 15.8: A motor shaft is connected to gear 1 which rotates at 50 rpm. Find the speed of output shaft gear 6 (Figure…

  • Simple Gear Train

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    Haroon Khalil
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    In this gear train, all the gears are mounted on their separate shafts and the gear axes remain fixed in a frame. All the paired gears are moved in opposite directions. All the gears can be in straight line or in zig-zag manner. Figure 15.24 shows the example of simple gear train. Example 15.7: There are four gears…

  • GEAR TRAINS

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    Haroon Khalil
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    Gear trains are various types of combination of gears to transfer power from one shaft to another. Gear trains can be classified as follows: Figure 15.24 Simple Gear Train