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Model NO.
718
High precision angular contact ball bearings performance
angular contact ball bearings can bear radial load and one direction axial load. When the bearing withstands radial loads, axial force will be generated on inner ring. Therefore, the single-row angular contact ball bearings are often used with other bearings which can withstand axial load in the opposite direction. That is, angular contact ball bearings are commonly used in pair, or in groups with three, four and even five bearings.
1. Contact angles of angular contact ball bearings
The contact angles of angular contact ball bearings for machine tool are 15° and 25°. The bearing with 15° contact angle is used when the high speed and light axial load are needed, while the 25° contact angle bearing should be adopted on the contrary.
2. Four dimension series of angular contact ball bearings
The precision angular contact ball bearings for spindles have four dimension series, 718, 719, 70 and 72. With the same inner diameter, the outer diameter and the width of 718, 719, 70 and 72 increase in sequence.
Table 1. The types and performance of angular contact ball bearings
| angular contact ball bearing series | Structures | Dimension series | Bore size range | Performance |
| High precision angular contact ball bearing |
718 C 718 AC 719 C 719 AC 70 C 70 AC 72 C 72 AC |
718:10~360mm 719:8~460mm 70: 8~380mm 72: 8~220mm |
High speed; Large loading capacity; Suit for grease or oil-mist lubrication |
|
| High speed angular contact ball bearing(incl. hybrid ball bearing) |
H719 C H719 AC H70 C H70 AC H719 C/HQ1 H719 AC/HQ H70 C/HQ1 H70 AC/HQ1 |
H719:8~220mm H70:8~220mm H719/HQ1:8~220mm H70/HQ1:8~220mm |
Super speed; High rigidity; Suit for air-oil or oil injection lubrication |
|
| Super speed angular contact ball bearing(incl. hybrid ball bearing) |
HS719 C HS719 AC HS70 C HS70 AC HS719 C/HQ1 HS719 AC/HQ HS70 C/HQ1 HS70 AC/HQ1 |
HS719:8~220mm HS70:8~220mm HS719/HQ1:8~220mm HS70/HQ1:8~220mm |
Super speed (higher than H series); High rigidity; Suit for air-oil or oil injection lubrication |
|
| Super speed angular contact ball bearing with direct lubrication(incl. hybrid ball bearing) |
H719 C-DL H719 AC-DL H70 C-DL H70 AC-DL H719 C/HQ1-DL H719 AC/HQ-DL H70 C/HQ1-DL H70 AC/HQ1-DL |
H719-DL:20~220mm H70-DL:30~220mm H719/HQ1-DL:20~220mm H70/HQ1-DL:30~220mm |
Super speed (higher than H and HS series); High rigidity; Suit for direct lubrication |
|
| High speed sealed angular contact ball bearing(incl. hybrid ball bearing) |
B719 C-2RZ B719 AC-2RZ B70 C-2RZ B70 AC-2RZ B70 C-2RZ/HQ1 B719 AC-2RZ/HQ1 B70 C-2RZ/HQ1 B70 AC-2RZ/HQ1 |
B719-2RZ:10~220mm B70-2RZ:10~220mm B719-2RZ /HQ1:10~220mm B70-2RZ /HQ1:10~220mm |
High speed; High rigidity; Grease lubrication |
|
| High speed bearings for inner diameter grinding spindles (incl. hybrid ball bearing) |
B70 C B70 C/HQ1 |
B70 C:10~60mm B70 C /HQ1:10~60mm |
Super speed; High rigidity; Suit for oil mist lubrication |
3. Application of angular contact ball bearings :
•Machine tool spindle
•high-frequency motor
•Robot technology
•gas turbine
•centrifuge
•small-size automobile front wheels
•differential pinion shaft
4. Advantages of angular contact ball bearings :
As an important type of machine tool bearing, angular contact ball bearing has the following advantages:
The chamfer arc radius of rings is reasonable, which is not only convenient to install, but also guaranteed to improve the installation precision and reduce the risk of the related parts being bumped;
•The speed performance is outstanding
•Unique heat treatment process allows products to achieve the best dimensional stability and rigidity, so as to reduce wear and tear;
•Multiple pre-load levels can help to meet different requirements for speed and system stiffness, which is more reasonable to select and use the levels.
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