3. Overview/functional description
3.6.1 Functioning of a VPB progressive metering device
The task of the progressive metering device
is to consecutively distribute specified por-
tions of the pressure-fed lubricant (grease
or oil) to the connected lubrication points.
The lubricant continues to discharge as
long as it is pressure-fed to the progres-
sive metering device. The specified portions
are metered by the piston movement. Two
lubricant outlets on the two end posi-
tions of the piston travel are allocated to
each piston. If lubricant is pressure-fed, all
pistons of a progressive metering device
move sequentially to their end position. The
piston movement displaces a portion of the
lubricant that is upstream of the piston to
the downstream outlet. A piston can start
moving only after the upstream piston has
been moved to its end position. If all pistons
are in their left or right end position, internal
connecting bores in the progressive meter-
ing device ensure that the pistons continue
running reliably as defined. When all pistons
have been moved once to the left end posi-
tion as well as to the right end position, all
connected lubrication points have been sup-
plied once with the preset lubricant quantity.
The metered volumes for both outlets are
determined by the diameter and the travel
of the piston. The selection of the required
metered volume is made during the design
Plug
917-006-101
(hexagon socket WAF 3)
Plug screw
466-431-001 for VPBM
466-419-001 for VPBG
Lubricant
inlet
of the progressive metering device. A subse-
quent change of the portions is only possible
through modification of the progressive
metering device.
Fig. 11 Sectional view of a VPB progressive metering device
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951-230-008-EN
Version 04
EN
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