Page 597 - The Mechatronics Handbook

0066_Frame_C20 Page 67 Wednesday, January 9, 2002 5:49 PM

FIGURE 20.91 External spur gear pump (Casappa).

FIGURE 20.92 Internal gear pump (Truninger).

delimit appropriate variable volumes. In Fig. 20.93, as in most constructions, the vanes are borne by the
rotor which can rotate inside the stator. Rotation leads to the displacement of volumes of fluid enclosed
between two consecutive vanes from the intake environment to input into the delivery environment.
This type of pump permits a range of working pressures up to 100 bar and, compared with gear pumps,
guarantees lower pulsing of the delivery flow and greater silence.

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