Function
When the motor-driven unit is switched on,
the primary shaft is driving via a reduction
gear (1/100) a vertical shaft, on which an
eccentric is mounted.
The pump elements are fitted around the
pump housing. They are metering and deli-
vering lubricant quantities by means of pis-
tons. Every pump element is connected to
the eccentric as the piston heel is put into the
eccentric groove (†
fig. 7).
Every rotation
(≈15 min
-1
) of the eccentric actuates the
pump elements.
When the eccentric is pulling out the pis-
ton to its maximum, a suction hole is ope-
ning and a quantity of lubricant is sucked in
the metering chamber of the pumping ele-
ment. During its rotation the eccentric will
push back the piston into the pumping ele-
ment. Under the pressure of the piston, the
lubricant in the metering chamber is fed out
through the pumping element outlet.
The pump element outlet is either directly
connected to a lubrication point, or to a pri-
mary line, which is delivering the lubricant to
progressive feeders.
Control (manometer, pressure switches,
flow indicators) and safety devices (over-
pressure valve) have to be independently
installed on every line in regard to the requi-
rements and surrounding conditions of eve-
ry lubrication point.
The stirrer in the reservoir is reducing the
risk of malfunctions, which are due either to
pumping element unpriming (air pockets or
bubbles in the lubricant), or to lubricant
component separation.
15