plaquette MACHLINE - Ntn-snr.com

MachLine ® ML - High Speed:
our solution for very high speeds
SNR has developed a range specifically designed to meet increasingly stringent
requirements in applications using very high speed spindles.
Optimized design
The ML range is made up of series 7000 and 71900.
The internal geometry of these bearings has been
optimized to guarantee optimum behavior and operation
at limit speeds:
- Angle of contact 17° and 25°.
- Precision 4S.
- Phenolic resin cage with improved guidance.
- Design optimized for oil lubrication.
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Residual theoretical average contact angle
16
17° Design
Contact angle (degrees)
14
12
10
8
6
4
2
0
15° Design
0 5 000 10 000 15 000 20 000 25 000 30 000
Rotation speed (rpm)
The graph opposite shows changes
in the contact angle of a ML7011CVUJ74S
according to rotation speed.
The advantage of a 17° design is that it
maintains a larger contact angle at top
speeds than a 15° design.
A « V » is marked on the outside diameter, in direction of the contact angle,
to facilitate installation and creation of bearing arrangements.
Performance: reducing operating deformations
- Increase rotation speed, while maintaining a load
capacity compatible with the service life target for
high speed spindles.
- Speed coefficient on the order of 2.2x10 6 N.Dm.
These performance values have been made possible
by using smaller balls and more of them.
This design has the major advantage of increasing the
ring cross-section, reducing operation deformations.
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