E第4部_P046-085再入稿.qxd 11.2.24 9:06 PM ページ 48
1. ANGULAR CONTACT BALL BEARINGS
Part 1
Part 2
Part 3
Part
4
Part 5
Part 6
Part 7
Part 8
High Precision Angular Contact Ball Bearings (Standard Series)
Contact angle
Fig. 1.1
Features
(Bearing number example)
TYN
DB L P4
Accuracy symbol
Dimension symbol
Preload symbol
Arrangement symbol
Contact angle symbol
Standard
Bore number
Fa
Seal symbol
Cage symbol
Material symbol
Contact Angle
Fr
Contact point
When a load is applied to an angular contact ball bearing,
elastic deformation and the amount of stress at the contact
point changes as a result of the varying load conditions of the
balls, inner ring, and outer ring according to the contact angle
of the bearing.
Fa
Fa
Contact point
15˚
30˚
Bal
0 13 C
Bearing type symbol
Effective load center
Fig. 1.2
7
Angular Contact Ball Bearings
Numbering System of High Precision Angular Contact Ball Bearings (Standard Series)
Single-row angular contact ball bearings have a line connecting
the contact points drawn in the radial direction, which is called
the contact angle. The contact angle makes this bearing
suitable for accommodating radial loads, single direction axial
loads, and a combination of both. Furthermore, since an axial
component is generated when a radial load is applied, these
bearings are generally used in pairs, triplex sets, quadruplex
sets, or multiplex sets.
Figure 1.2 illustrates loads acting on two rolling elements for a
30˚ contact angle, and a 15˚ contact angle. The relation
between an axial load being applied to the bearing and resulting
load acting on the rolling element can be formulated as:
Reference pages
7
Bearing type
0
Dimension
13
Bore number
C
Contact angle
7: single-row angular contact ball bearing
42-43, 48
9: 19 series, 0: 10 series, 2: 02 series
42-43, 48
Less than 03, Bearing bore 00: 10 mm, 01: 12 mm 02: 15 mm, 03: 17 mm
Over 04, Bearing bore Bore number × 5 (mm)
C: 15˚, A5: 25˚, A: 30˚
50-60
42-43, 48
Fa/(Number of balls × sinα).
l dia
me
Material
ter
Fa /
Fa /
Number of balls
Number of balls
Load actingg on
rolling element
30˚˚ contact angle
Load actingg on
rolling element
Therefore, the larger the contact angle, the smaller the load
acting on the rolling element. Load at the contact point, and its
consequential deformation, is reduced thus resulting in longer
life. When a radial load is applied, the smaller the contact
angle, the smaller the load acting on the rolling element, thus
resulting in reduced load at the contact point.
TYN
Cage
Seal
15˚˚ contact angle
(See Pages 42 and 43 for contact angle specifics.)
No symbol: bearing steel (SUJ2) SN24: ceramic ball (Si3N4) ( 1 )
TYN: ball guided polyamide resin cage; limiting speed dmn = 1 400 000; operational temperature limit = 120˚C
TR: outer ring guided phenolic resin cage; operational temperature limit = 120˚C
No symbol: open type
V1V: non-contact rubber seal ( 2 )
14-17
18-19
32
SU: universal arrangement (single row) DU: universal arrangement (double row)
DB
Arrangement
Dimension Series
DB: Back-to-back arrangement DF: Face-to-face arrangement DT: tandem arrangement
DBD, DFD, DTD, DUD: triplex set arrangement • DBB, DFF, DBT, DFT, DTT, QU: quadruplex set arrangement
Fig. 1.3
EL: extra light preload, L: light preload, M: medium preload, H: heavy preload
L
Preload
P4
Accuracy
CP: special preload, CA: special axial clearance
P2: ISO Class 2, P4: ISO Class 4, P5: ISO Class 5
P3: special class (dimensional accuracy: ISO Class 4; rotating accuracy: ISO Class 2)
P4Y: special class (Bore diameter and outside diameter are exclusive to NSK. All others are ISO Class 4.)
42-43
148-151
42-43
152-160
151
176-179
(1) Angular contact ceramic ball bearing correspondence numbers 79, 70: Bore diameter= φ 10-100 mm.
(2) Sealed angular contact ball bearings are standardized for SU arrangement and ISO Class 3.
Sealed angular contact ball bearing correspondence numbers 79, 70: Bore diameter= φ 30-100 mm.
72
48
70
79
49