NORD Drivesystems B1000 - Manual (Page 41)

www.nord.com A39 G1000 – Subject to Change Without Notice
INTRODUCTION
Lubrication
Oil Expansion Chamber (OA)
Oil Expansion Chamber (OA)
Gear units with the motor or input shaft mounted
vertically upright must be fi lled almost completely
with oil in order to properly supply the 1st stage gear-
ing with oil. Certain operating conditions and high-
er gear peripheral speeds can result in increased oil
churning or splashing losses and heating of the air
space located above the oil.
For these conditions an oil expansion chamber or oil
overfl ow chamber is often recommended. At rest, the
gear unit is fi lled to its normal fi ll-level position and
there should be no oil in the expansion chamber.
During operation, the oil expansion chamber pro-
vides a safe overfl ow area for the expanded oil-air
mixture, thus eliminating excessive pressure build-up,
minimizing the formation of foam, and preventing
oil-loss through the breather, oil seals, gaskets, etc.
As heat is released from the expanded air-oil mixture
contained within the overfl ow chamber, gravity al-
lows the oil to be returned to the primary gear sump
supply, eliminating a critical loss in oil level.
Application Considerations
Nord strongly recommends the use of an oil expan-
sion chamber when the motor is mounted vertical-up,
when the reducer mounting position is M4 or when it
meets any of the criteria listed below. Any application
required to operate above 1800 rpm synchronous mo-
tor speeds should also be reviewed to be certain that
the reducer thermal limits are observed.
• Helical In-line gear unit sizes SK42 and larger, with
ratios
i
total
≤ 24:1 or output speeds n
2
≥ 75 rpm.
• Parallel shaft gear unit sizes between SK4282 -
SK8282
6, with ratios i
total
≤ 24:1 or output speeds
n
2
≥ 75 rpm.
• Helical-bevel gear unit sizes SK9042.1 and larger
with ratios i
total
≤ 24:1 or output speeds n
2
≥ 75 rpm.
• Any helical-worm gear unit with ratio i
total
≤ 20:1 or output
speeds n
2
≥ 90 rpm (please consult NORD for application
review).
6 Clincher gear unit sizes SK9282/SK9382 and larger
require an oil reservoir (option OT) instead of an oil
expansion chamber (Option OA).
Helical In-line Gear Unit Clincher™ Gear Unit Helical-Bevel Gear Unit Size Part Number D H [lb]
SK 42/SK 43
SK 52/SK 53
SK 63 SK 4282/SK 4382
SK 5282/SK 5382
SK 6382 SK 9042.1/SK 9043.1
SK 9052.1/SK 9053.1
I 28390390 3.94 7.09 11.0
SK 62
SK 72/SK 73 SK 6282
SK 7282/SK 7382 SK 9072.1
SK 9082.1
II 28390400 5.91 11.81 13.2
SK 82/SK 83
SK 92/SK 93
SK 102/SK 103 SK 8282/SK8382 SK 9086.1
SK 9092.1
SK 9096.1
III 28390410 7.09 11.81 15.4
0D
H
0D
H
0D
H