Page 368 - SKF-bearing-housings

Split plummer block housings SONL series

Lubrication Fig. 13
Oil bath lubrication with a pick-up ring
SONL plummer (pillow) block housings are
designed for two methods of oil lubrication:

• oil bath lubrication with a pick-up ring
• circulating oil
The lubricant should be selected based on the
operating conditions of the bearing. For add-
itional information about lubricant selection,
refer to the product information available
online at skf.com/bearings.

Oil bath lubrication with a pick-up ring
Oil bath lubrication with a pick-up ring is typ-
ically used with SONL housings († fig. 13). It
provides a uniform supply of lubricant to the
bearing.
This oil lubrication method uses a ring that
hangs loosely from the labyrinth seal shaft
sleeve on one side of the bearing. It hangs deep
into the oil reservoir in the bottom half of the
housing. As the shaft rotates, the ring follows,
picking up oil from the sump and bringing it to
a collecting trough. The oil then flows through
the bearing and back into the oil sump.
In the fifty years that this lubrication
method has been used, there has not been any
record of wear where the ring contacts its seat Table 4
on the labyrinth seal shaft sleeve – regardless Oil quantities
of the shaft dimensions, or speed of the Housing Oil fill
application. Size min max

Oil quantities – l
Housings should be filled with the recom- 217-517 0,3 0,4
mended oil quantities listed in table 4. Mark- 218-518 0,3 0,5
ings on the inside of the housing base and on 220-520 0,4 0,6
the oil level gauge indicate the correct oil level. 222-522 0,6 0,9
To avoid leakage, do not exceed the recom- 224-524 0,9 1,3
1,4
0,9
226-526
mended oil level. The oil pick-up ring enables
a wide range between maximum and mini- 228-528 1 1 1,5
1,7
230-530
mum oil levels. This results in a correspond- 232-532 1,3 2
ingly long period between refills or oil changes. 234-534 2,5 3,5
The minimum and maximum levels indi- 236-536 2,9 4,2
cated on the oil level gauge apply to standstill. 238-538 3,1 4,5
The oil level may drop during operation and 240-540 3 4,5
may vary even more during start-up. If oil is 244-544 3,8 5,8
4,8
6,9
248-548
replenished during operation, keep the level
5 mm below the maximum mark.
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