Angular Contact Ball Bearing

        Single row angular contact ball bearings can not only withstand radial load and axial load in one direction, but also accommodate only axial load in single direction, radial loads produce axial forces in these bearings that need to be balanced by counter forces.Therefore, the single row angular contact ball bearings often need to be installed with other bearings which withstand axial load in the opposite direction. In other words, the angular contact ball bearings are commonly used in pair, or in groups with three, four and even five bearings. Angular contact ball bearings have higher limiting speed.


The bearings codes designation:

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The bearings matched ways as below :

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DB

The load lines in a pair of bearings by back to back assembly are enlarging from the bearing axis. It can bear axial load in two directions and relative larger moment because of larger angular rigidity.

 

DF

The load lines in a pair of bearings by face to face assembly are convergence toward the bearing axis. It can bear axial load in two directions and smaller moment because of smaller angular rigidity.

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DT

A pair of bearings by series a ssembly only bear axial load in one direction, but it is able to

 bear larger axial load related to DB and DF.


TBT

The tri-bearing matching TBT or TFT isobtained by increasing the same type of the bearing based on DB or DF There are higher axial and radial rigidity for TBT and TFT, so larger load can be supported.

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QBC

The four bearing matching QBC (or QFC) is obtained by matching double set of DB (or DF) bearings. QBT (or QFT) is formed when three bearings are installed in a same direction and another one back (or face) to them.

PBC

Divide the five bearings into two groups of three and two bearings respectively, in which the bearings are all installed in the same direction, PBC is formed when the groups match each other by back to back and PFC by face to face. If four bearings are installed in the same direction and another one back (or face) to them, then PBT (or PFT) is formed.



 

1.MONTON Angular contact ball bearings performance and Characteristics.

 

 

The MONTON precision angular contact ball bearings for spindle, have four size series, 718,719,70 and 72. With the same inner diameter, but the outer diameter and the width of 718,719,70 and 72 series increase in turn.

 

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                     Fig.1  Angular contact ball bearing dimension series

MONTON precision angular contact ball bearings with 15° (C) and 25° (AC) contact angles. As for the angular contact ball bearings, the bigger the contact angle is, the greater the axial load capacity is, but the lower the limiting speed of bearings becomes. Therefore, the spindle, with high speed and small axial load, should adopt the 15° angular contact ball bearings, whereas the 25° angular contact ball bearings should be adopted. 

MONTON precision angular contact ball bearings with high-speed angular contact bearings (standard series), super high-speed angular contact ball bearings, high-speed sealed angular contact ball bearings and high-speed spindle bearings.

 

The inner ring, outer ring and rolling element of rolling bearing under normal operating conditions are made of high carbon chromium bearing steel, but the steel bearings cannot meet the requirements of such special conditions as high speed, wear-resisting, low temperature rising, long life and high reliability etc., then Si3N4 ceramics are believed to be present optimum rolling bearing materials to replace bearing steel.

 


Table 1. Main performance comparison between Si3N4 and bearing steel

Performance

Code and unit

Si3N4

Bearing steel

Density

γ[g/mm3]

3.2

7.8

Coefficient of thermal expansion

α[1/]

201000

3.2×10-6

-

20300

-

11.8×10-6

Modulus of elasticity

E[N/mm2]

3.15×105

2.08×105

Poisson's ratio

μ

0.26

0.3

Rigidity

HV10

1700

700

Stress  intensity

σB[N/mm2]

20

700

2400

1000

700

0

Fracture toughness

Kie[MN/m1.5]

7

25

Coefficient of heat conductivity

λ[W/m]

3040

4050

Electrical resistivity

[Ωmm2/m]

10171018

0.11

MONTON also offers widely used hybrid angular contact ball bearings for spindles in high-speed precision machine tools and other high-speed precision machines, that is, the inner and outer rings are made of high-quality bearing steel materials, while the rolling element is made of Si3N4 ceramics. 

Compared to the angular contact ball bearings made of steel, hybrid angular contact ball bearings with the same structure and size have high speed, high stiffness, low friction heat, and long life etc.

MONTON precision hybrid bearings with ceramic ball (HQ1) can significantly improve the speed, rigidity, reliability, and productivity of machine tools, and greatly reduce the friction heat, then extend the service life of host machine etc.

 

 

Table 2. The type and performance of MONTON angular contact ball bearing

MONTON 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

71810360mm

7198460mm

708380mm

728220mm

High speed

Large loading capacity

Suit for grease

or oil-mist lubrication

 

High speed angular contact ball bearing

(hybrid ball bearing)

H719 C

H719 AC

H70 C

H70 AC

H719 C/HQ1

H719 AC/HQ

H70 C/HQ1

H70 AC/HQ1

H7198220mm

H708220mm

H719/HQ18220mm

H70/HQ18220mm

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

HS7198220mm

HS708220mm

HS719/HQ1:8220mm

HS70/HQ1:8220mm

Super speed

(higher t

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