ABSTRACT
All gears have one common element: their teeth. In all other respects, the shapes and structures of gears may differ very much. Figure 8.1 shows several typical shapes of gears: pinion shafts (Figure 8.1a and Figure 8.1b), gears mounted on shafts (Figure 8.1c to Figure 8.1f), sun wheels of planetary gears (Figure 8.1g and Figure 8.1h), planet wheels (Figure 8.1i and Figure 8.1j), and ring gears (Figure 8.1k and Figure 8.1l). In this chapter, we will mainly discuss simple gearings.
