plaquette MACHLINE - Ntn-snr.com

Performance values for MachLine CH - Hybrid
Increase in rotation speed:
+ 30%
The kinematics of SNR hybrid bearings generates
less slipping and heating than steel ball bearings.
At a given temperature, they can operate at
approximately 30 % higher speeds than steel ball
bearings.
Improved rigidity:
+ 10%
The fact that the modulus of elasticity of ceramics is
higher than that of steel means that the rigidity of a
hybrid bearing can be increased by approximately
10 % under a given preload.
In certain situations, the properties
of "hybrid" bearings may allow grease
lubrication where air-oil lubrication
would otherwise be required due to
the required rotation speed. This option
provides economic advantages.
3 times longer life:
x 3
The lubrication and friction behavior of ceramics, in
particular, their low friction coefficient and capacity
to operate in reduced lubrication conditions, means
that bearing raceways resist wear and damage
much longer than with steel balls. The actual service
life depends on operating conditions, but has been
observed to be on the order of 2 or 3 times greater
than steel ball bearings (under comparable operating
conditions).
Lubrication:
Reduce costs
Lubricants used for 100Cr6 steel bearings can
generally be used with ceramic ball bearings. Some
applications may require a specific study to define
the recommended lubricant.
Example for a CH7009CVDTJ04,
spring preloaded to 550 N
Bearing temperature
80
70
60
50
40
30
20
Steel ball
Ceramic ball
Temperature as a function
of rotation speed:
At a temperature of 45°C,
the rotation speed goes
from 10,000 rpm with
steel balls to 13,000 rpm
with ceramic balls.
10
0 5000 10000 13000
20000 25000 30000
Rotation speed (rpm)
0
31