Hydraulics
9803/8500
Issue 1
Auxiliary Pump
The auxiliary pump is a gear type pump. The
working principle of a gear pump depends on the
meshing of two spur gears A and B. Oil is picked up
on the suction side of the pump by the gears and
carried round between the gear teeth and the pump
body. As the gears come into mesh the oil is forced
out through the outlet port.
Some oil is allowed to circulate behind the bearings
C to hold them against the gears and minimise oil
slippage. Lubrication oil is drawn through the recess
D and around the counter bore. The oil then flows
along the scrolled grooves E in the bushes, induced
by the viscous drag of the rotating shaft.
4 - 2
4 - 2
Descriptions
Section E Section E
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