SKF轴承手册

发布时间:2009-11-04 来源:扬子工具集团 浏览次数:26032

ingle row deep groove ball bearings…………289
Single row deep groove ball bearings
with filling slots ………………………………361
Stainless steel deep groove ball bearings ……373
Double row deep groove ball bearings ………391
Single row cam rollers ………………………399
287
Deep groove
ball bearings

289
Single row deep
groove ball bearings
Designs ………………………………………………………………………………………… 290
Basic design bearings ……………………………………………………………………… 290
Sealed bearings …………………………………………………………………………… 290
ICOSTM oil sealed bearing units …………………………………………………………… 293
Bearings with snap ring groove …………………………………………………………… 294
Matched bearing pairs……………………………………………………………………… 294
SKF Explorer class bearings………………………………………………………………… 295
Bearing data – general ……………………………………………………………………… 296
Dimensions ………………………………………………………………………………… 296
Tolerances …………………………………………………………………………………… 296
Internal clearance …………………………………………………………………………… 296
Misalignment ……………………………………………………………………………… 296
Cages ………………………………………………………………………………………… 298
Minimum load ……………………………………………………………………………… 298
Axial load carrying capacity ……………………………………………………………… 299
Equivalent dynamic bearing load ………………………………………………………… 299
Equivalent static bearing load …………………………………………………………… 299
Supplementary designations ……………………………………………………………… 300
Product tables ………………………………………………………………………………… 302
Single row deep groove ball bearings …………………………………………………… 302
Sealed single row deep groove ball bearings …………………………………………… 324
ICOS™ oil sealed bearing units …………………………………………………………… 348
Single row deep groove ball bearings with snap ring groove …………………………… 350
Single row deep groove ball bearings with snap ring groove and shields……………… 356
Single row deep groove ball bearings are
particularly versatile. They are simple in design,
non-separable, suitable for high and
even very high speeds and are robust in
operation, requiring little maintenance. Deep
raceway grooves and the close conformity
between the raceway grooves and the balls
enable deep groove ball bearings to accommodate
axial loads in both directions, in
addition to radial loads, even at high speeds.
Single row deep groove ball bearings are
the most widely used bearing type. Consequently,
they are available from SKF in many
executions and sizes:
• open basic design bearings
• sealed bearings
• ICOSTM oil sealed bearing units
• bearings with snap ring groove, with or
without snap ring
Other deep groove ball bearings for special
applications, shown in the sections
“Engineering products” and “Mechatronics”
include
• hybrid bearings (page 891)
• insulated bearings (page 905)
• high temperature bearings (page 917)
• bearings with Solid Oil (page 945)
• sensorized bearings (page 953)
The SKF product range also includes inchsize
bearings and bearings with a tapered
bore. These variants are not included in this
General Catalogue. Information will be
provided on request.
Single row deep groove ball bearings
290
Designs
Basic design bearings
Basic design SKF single row deep groove
ball bearings (fig ) are open (unsealed).
For manufacturing reasons, those sizes of
open bearing that are also produced in
sealed or shielded versions may have seal
recesses in the outer ring.
Sealed bearings
The most popular sizes of deep groove ball
bearings are also produced in sealed versions
with shields or contact seals on one or both
sides. Details regarding the suitability of the
different seals for various operating conditions
will be found in table . Sealed bearings
in the wide 622, 623 and 630 series are
particularly suitable for long maintenancefree
service. In addition, ICOS bearing units
with integrated radial shaft seals are available
for higher sealing requirements.
The bearings with shields or seals on both
sides are lubricated for life and are maintenance-
free. They should not be washed or
heated to temperatures above 80 °C. Depending
on the series and size, deep groove ball
bearings are supplied charged with one of
three standard greases:
• LT10 grease for bearings in the 8 and
9 Diameter Series up to and including
30 mm outside diameter,
1
1
Fig 1
• MT47 grease for bearings in the 8 and 9
Diameter Series above 30 mm up to and
including 62 mm outside diameter and for
bearings in the 0, 1, 2 and 3 Diameter
Series up to and including 62 mm outside
diameter,
• MT33 grease for all bearings above 62 mm
outside diameter.
Characteristics of the above standard
greases are listed in table . The standard
grease is not identified in the bearing designation.
The quantity of grease fills some 25
to 35 % of the free space in the bearing. To
special order, other grease filling grades are
available. Also on request, special grease
fills (table 2 ) can be supplied
2
• high temperature grease GJN for
bearings up to and including 62 mm
outside diameter
• high temperature grease HT22 for
bearings above 62 mm outside diameter
• low temperature grease LT20
• wide temperature range grease GWB
• wide temperature range and silent
running grease LHT23
291
Seal selection guidelines
Requirement Shields Low-friction seals Contact seals
Z RSL RZ RSH RS1
Low friction +++ ++ +++ o o
High speeds +++ +++ +++ o o
Grease retention o +++ + +++ ++
Dust exclusion o ++ + +++ +++
Water exclusion
static − o − +++ ++
dynamic − o − + +
high pressure − o − +++ o
Symbols: +++ excellent ++ very good + good o fair – not recommended
Table 1
SKF grease filling for sealed deep groove ball bearings
Technical Standard greases Special greases
specifications LT10 MT47 MT33 GJN HT22 LT20 GWB LHT23
Thickener Lithium Lithium Lithium Polyurea Lithium Lithium Polyurea Lithium
soap soap soap soap complex soap soap soap
soap
Base oil type Diester oil Mineral oil Mineral oil Mineral oil Mineral oil Diester oil Ester oil Ester oil
NLGI consistency 2 2 3 2 3 2 2–3 2
class
Operating −50 to +90 −30 to +110 −30 to +120 −30 to +150 −20 to +140 −55 to +110 −40 to +160 −50 to +140
temperature, °C
Base oil viscosity,mm2/s
at 40 °C 12 70 74 115 110 15 70 26
at 100 °C 3,3 7,3 8,5 12,2 13 3,7 9,4 5,1
Table 2
Single row deep groove ball bearings
292
Bearings with shields
Bearings with shields, designation suffix Z
or 2Z, are produced in one of two designs,
depending on the bearing series and size
(fig ). The shields are made of sheet
steel and normally have a cylindrical extension
in the shield bore to form a long sealing
gap with the inner ring shoulder (a). Some
shields do not have the extension (b).
Shielded bearings are primarily intended
for applications where the inner ring rotates.
If the outer ring rotates, there is a risk that
the grease will leak from the bearing at high
speeds.
Bearings with low-friction seals
SKF deep groove ball bearings with lowfriction
seals, designation suffixes RSL,
2RSL or RZ, 2RZ, are manufactured in three
designs depending on bearing series and
size (fig ):
• bearings in the 60, 62 and 63 series up to
25 mm outside diameter are equipped with
RSL seals to design (a),
• bearings in the 60, 62 and 63 series from
25 mm and up to and including 52 mm
outside diameter are equipped with RSL
seals to design (b),
• other bearings have RZ seals (c).
The seals form an extremely narrow gap
with the cylindrical surface of the inner ring
3
2
shoulder or recess profile and are practically
non-contacting. Because of this, bearings
fitted with low-friction seals can be operated
at the same high speeds as bearings with Z
shields, but with improved seal performance.
The low-friction seals are made of oil and
wear-resistant acrylonitrile butadiene rubber
(NBR) with a sheet steel reinforcement. The
permissible operating temperature range
for these seals is −40 to +100 °C and up to
+120 °C for brief periods.
Bearings with contact seals
Bearings with contact seals, designation
suffixes RSH, 2RSH or RS1, 2RS1, are manufactured
in four designs depending on bearing
series and size (fig ):
• bearings in the 60, 62, and 63 series up to
25 mm outside diameter are equipped
with RSH seals to design (a),
• bearings in the 60, 62 and 63 series from
25 mm and up to and including 52 mm
outside diameter are equipped with RSH
seals to design (b),
• other bearings have RS1 seals, which seal
against the cylindrical surface of the inner
ring shoulder (c) indicated by dimension
d1 in the product table or against a recess
in the inner ring side face (d) indicated by
dimension d2 in the product table.
The seals are inserted in recesses in the
outer ring and provide good sealing at this
4
Fig 2 Fig 3
a b a b c
position without deforming the outer ring.
Standard seals are made of acrylonitrile
butadiene rubber (NBR) with a sheet steel
reinforcement. The permissible operating
temperature range for these seals is −40 to
+100 °C and up to +120 °C for brief periods.
When sealed bearings are operated under
certain extreme conditions, e.g. very high
speeds or high temperatures, grease leakage
may occur at the inner ring. For bearing
arrangements where this would be detrimental,
special design steps must be undertaken,
please consult the SKF application engineering
service.
ICOSTM oil sealed bearing units
ICOS oil sealed bearing units have been
developed by SKF. The new concept aims
at applications where sealing requirements
exceed the capabilities of standard sealed
bearings. An ICOS unit consists of a 62
series deep groove ball bearing and an
integral CR radial shaft seal (fig ). These
units need less space than common twocomponent
arrangements; they simplify
mounting, and avoid expensive machining
of the shaft because the inner ring shoulder
serves as a perfect seal counterface.
The CR radial shaft seal is made of acrylonitrile
butadiene rubber (NBR) and has a
spring loaded Waveseal lip. The permissible
operating temperature range for the seal is
−40 to +100 °C and up to +120 °C for brief
periods.
5
The speed limits quoted in the product
table are based on the permissible circumferential
speed for the CR seal, which in this
case is 14 m/s.
293
Fig 4
Fig 5
a b c d
Bearings with snap ring groove
Deep groove ball bearings with a snap ring
groove can simplify arrangement design as
the bearings can be axially located in the
housing by a snap (or retaining) ring (fig ).
This saves space. Appropriate snap rings are
shown in the product table with designation
and dimensions and may be supplied separately
or already mounted on the bearing.
SKF deep groove ball bearings with a
snap ring groove (fig ) are supplied as:
• open (unsealed) bearings, designation
suffix N (a);
• open bearings with a snap ring, designation
suffix NR (b);
• bearings with a Z shield at the opposite
side and a snap ring, designation suffix
ZNR (c);
• bearings with Z shields on both sides and
a snap ring, designation suffix 2ZNR (d).
Matched bearing pairs
For bearing arrangements where the load
carrying capacity of a single bearing is inadequate,
or where the shaft has to be axially
located in both directions with a given amount
of axial clearance, SKF can supply matched
pairs of single row deep groove ball bearings
to order. Depending on the requirements the
matched pairs can be supplied in tandem,
back-to-back, or face-to-face arrangements
(fig ). The bearings are matched in production
so that, when mounted immediately
adjacent to each other, the load will be even-
8
7
6
Single row deep groove ball bearings
294
Fig 7
Fig 6
a b c d
ly distributed between the bearings without
having to use shims or similar devices.
Further information on matched bearing
pairs can be found in the “SKF Interactive
Engineering Catalogue” on CD-ROM or
online at www.skf.com.
295
Fig 8
SKF Explorer class
bearings
High performance SKF Explorer deep groove
ball bearings are shown with an asterisk in
the product tables. The higher performance
of SKF Explorer deep groove ball bearings
also includes quieter running. SKF Explorer
bearings retain the designation of the earlier
standard bearings. However, each bearing
and its box are marked with the name
“EXPLORER”.
Bearing data – general
Dimensions
The boundary dimensions of SKF single row
deep groove ball bearings are in accordance
with ISO 15:1998. Dimensions of the snap
ring grooves and snap rings comply with
ISO 464:1995.
Tolerances
SKF single row deep groove ball bearings
are manufactured as standard to Normal
tolerances.
SKF Explorer single row deep groove ball
bearings are produced to higher precision
than the ISO Normal tolerances. The dimensional
accuracy corresponds to P6 tolerances,
except the width tolerance, which is
considerably tighter and reduced to
• 0/−60 μm for bearings with outside diameter
up to 110 mm and
• 0/−100 μm for larger bearings.
The running accuracy depends on the bearing
size and corresponds to
• P5 tolerances for bearings up to 52 mm
outside diameter,
• P6 tolerances for bearings above 52 mm
up to 110 mm outside diameter and
• Normal tolerances for larger bearings.
For bearing arrangements where accuracy
is a key operational factor some SKF single
row deep groove ball bearings are also available
with accuracy completely to P6 or P5
tolerance class specifications. The availability
of these bearings should always be
checked before ordering.
The tolerances are in accordance with
ISO 492:2002 and can be found in tables
to , starting on page 125.
Internal clearance
SKF single row deep groove ball bearings
are manufactured with Normal radial internal
clearance as standard. Most of the bearings
are also available with C3 radial internal
clearance. Some of the bearings can even
be supplied with the appreciably greater C4
or the smaller C2 clearances. In addition,
deep groove ball bearings are available with
5
3
reduced or displaced internal clearance
ranges. These special clearances may use
reduced ranges of standard clearance
classes or partitions of adjacent classes
(designation suffix CN on page 300).
Bearings with internal clearance not to
standard are supplied on request.
The values for radial internal clearance are
given in table . They are in accordance with
ISO 5753:1991 and are valid for unmounted
bearings under zero measuring load.
Misalignment
Single row deep groove ball bearings have
only limited ability to accommodate misalignment.
The permissible angular misalignment
between the inner and outer rings, which
will not produce inadmissibly high additional
stresses in the bearing, depends on
• the radial internal clearance of the bearing
in operation,
• the bearing size,
• the internal design and
• the forces and moments acting on the
bearing.
Because of the complex relationship between
these factors, no generally applicable specific
values can be given. However, depending
on the various influences of the factors,
the permissible angular misalignment lies
between 2 and 10 minutes of arc. Any misalignment
will result in increased bearing
noise and reduced bearing service life.
3
Single row deep groove ball bearings
296
297
Radial internal clearance of deep groove ball bearings
Bore Radial internal clearance
diameter C2 Normal C3 C4 C5
d
over incl. min max min max min max min max min max
mm μm
6 0 7 2 13 8 23 – – – –
6 10 0 7 2 13 8 23 14 29 20 37
10 18 0 9 3 18 11 25 18 33 25 45
18 24 0 10 5 20 13 28 20 36 28 48
24 30 1 11 5 20 13 28 23 41 30 53
30 40 1 11 6 20 15 33 28 46 40 64
40 50 1 11 6 23 18 36 30 51 45 73
50 65 1 15 8 28 23 43 38 61 55 90
65 80 1 15 10 30 25 51 46 71 65 105
80 100 1 18 12 36 30 58 53 84 75 120
100 120 2 20 15 41 36 66 61 97 90 140
120 140 2 23 18 48 41 81 71 114 105 160
140 160 2 23 18 53 46 91 81 130 120 180
160 180 2 25 20 61 53 102 91 147 135 200
180 200 2 30 25 71 63 117 107 163 150 230
200 225 4 32 28 82 73 132 120 187 175 255
225 250 4 36 31 92 87 152 140 217 205 290
250 280 4 39 36 97 97 162 152 237 255 320
280 315 8 45 42 110 110 180 175 260 260 360
315 355 8 50 50 120 120 200 200 290 290 405
355 400 8 60 60 140 140 230 230 330 330 460
400 450 10 70 70 160 160 260 260 370 370 520
450 500 10 80 80 180 180 290 290 410 410 570
500 560 20 90 90 200 200 320 320 460 460 630
560 630 20 100 100 220 220 350 350 510 510 700
630 710 30 120 120 250 250 390 390 560 560 780
710 800 30 130 130 280 280 440 440 620 620 860
800 900 30 150 150 310 310 490 490 690 690 960
900 1 000 40 160 160 340 340 540 540 760 760 1 040
1 000 1 120 40 170 170 370 370 590 590 840 840 1 120
1 120 1 250 40 180 180 400 400 640 640 910 910 1 220
1 250 1 400 60 210 210 440 440 700 700 1 000 1 000 1 340
1 400 1 600 60 230 230 480 480 770 770 1 100 1 100 1 470
Please refer to page 137 for definition of radial internal clearance
Table 3
Single row deep groove ball bearings
298
Fig 9
a b c d
Cages
Depending on the bearing series and size,
SKF single row deep groove ball bearings
are supplied with one of the following cages
(fig ):
• ribbon-type cage of steel or brass sheet (a)
• riveted cage of steel or brass sheet (b)
• machined brass cage (c)
• snap-type cage of polyamide 6,6 (d)
Bearings having a pressed steel cage in
standard execution may also be available
with a machined brass or polyamide cage.
For higher operating temperatures, polyamide
4,6 or PEEK cages may be advantageous.
Before ordering, please check for
availability.
Note:
Deep groove ball bearings with polyamide
6,6 cages can be operated at temperatures
up to +120 °C. The lubricants generally used
for rolling bearings do not have a detrimental
effect on cage properties, with the exception
of a few synthetic oils and greases with a
synthetic oil base and lubricants containing
a high proportion of EP additives when used
at high temperatures.
For bearing arrangements, which are to be
operated at continuously high temperatures
or under arduous conditions, SKF recommends
using bearings with a pressed steel
or a machined brass cage.
9
For detailed information regarding the
temperature resistance and the applicability
of cages, please refer to the section “Cage
materials”, starting on page 140.
Minimum load
In order to provide satisfactory operation,
deep groove ball bearings, like all ball and
roller bearings, must always be subjected to
a given minimum load, particularly if they are
to operate at high speeds or are subjected
to high accelerations or rapid changes in the
direction of load. Under such conditions the
inertia forces of the balls and cage, and the
friction in the lubricant, can have a detrimental
effect on the rolling conditions in the bearing
arrangement and may cause damaging sliding
movements to occur between the balls
and raceways.
The requisite minimum radial load to be
applied to deep groove ball bearings can be
estimated using
n dm Frm = kr ( )2/3( )2
1 000 100
where
Frm = minimum radial load, kN
kr = minimum load factor
(product tables)
= oil viscosity at operating
temperature, mm2/s
n = rotational speed, r/min
dm = bearing mean diameter
= 0,5 (d + D), mm
299
When starting up at low temperatures or
when the lubricant is highly viscous, even
greater minimum loads may be required.
The weight of the components supported by
the bearing, together with external forces,
generally exceeds the requisite minimum
load. If this is not the case, the deep groove
ball bearing must be subjected to an additional
radial load. For applications where
deep groove ball bearings are used, an axial
preload can be applied by adjusting the inner
and outer rings against each other, or by
using springs.
Axial load carrying capacity
If deep groove ball bearings are subjected
to purely axial load, this axial load should
generally not exceed the value of 0,5 C0.
Small bearings (bore diameter up to approx.
12 mm) and light series bearings (Diameter
Series 8, 9, 0, and 1) should not be subjected
to an axial load greater than 0,25 C0.
Excessive axial loads can lead to a considerable
reduction in bearing service life.
Equivalent dynamic bearing load
For dynamically loaded single row deep
groove ball bearings
P = Fr when Fa/Fr  e
P = XFr + YFa when Fa/Fr > e
The factors e, X and Y depend on the relationship
f0 Fa/C0, where f0 is a calculation
factor (product tables), Fa the axial component
of the load and C0 the basic static
load rating.
In addition, the factors are influenced by
the magnitude of the radial internal clearance;
increased clearance allows heavier axial loads
to be supported. For bearings mounted with
the usual fits (shaft tolerance j5 to n6 depending
on the shaft diameter, and housing bore
tolerance J7), the values for e, X and Y are
listed in table . If a clearance greater than
Normal is chosen because a reduction in
clearance is expected in operation, the values
given under “Normal clearance” should be
used.
Equivalent static bearing load
For statically loaded single row deep groove
ball bearings
P0 = 0,6 Fr + 0,5 Fa
If P0 < Fr, P0 = Fr should be used.
4
Calculation factors for single row deep groove ball bearings
Normal clearance C3 clearance C4 clearance
f0 Fa/C0 e X Y e X Y e X Y
0,172 0,19 0,56 2,30 0,29 0,46 1,88 0,38 0,44 1,47
0,345 0,22 0,56 1,99 0,32 0,46 1,71 0,40 0,44 1,40
0,689 0,26 0,56 1,71 0,36 0,46 1,52 0,43 0,44 1,30
1,03 0,28 0,56 1,55 0,38 0,46 1,41 0,46 0,44 1,23
1,38 0,30 0,56 1,45 0,40 0,46 1,34 0,47 0,44 1,19
2,07 0,34 0,56 1,31 0,44 0,46 1,23 0,50 0,44 1,12
3,45 0,38 0,56 1,15 0,49 0,46 1,10 0,55 0,44 1,02
5,17 0,42 0,56 1,04 0,54 0,46 1,01 0,56 0,44 1,00
6,89 0,44 0,56 1,00 0,54 0,46 1,00 0,56 0,44 1,00
Intermediate values are obtained by linear interpolation
 


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