NSK's BELTOP 8 is a high-reliability, low-friction ball bearing specially developed for belt-type continuously variable transmissions (CVT), which helps to improve the reliability and efficiency of CVT. The belt type continuously variable transmission transmits engine power through belts and pulleys, and has continuous stepless speed regulation capability.
The performance of the BELTOP 8 bearing is as follows:
1, Configuration, structure and technical parameters (Figure 1)
8 characteristics of BELTOP 8 in the configuration
●The inner and outer rings are subjected to special heat treatment (UR, HTF) and the service life is extended;
● Extend life and improve card bit resistance by using special heat treatment (UR EQTF) balls;
●Longer life, less friction and lighter weight due to the use of plastic cages;
● Implement complex functions by setting appropriate internal technical parameters;
● Compact, lightweight bearings (narrow offset channels);
● Introduce a non-creep outer ring (high stiffness outer ring) to prevent creeping;
● Prevent bearing block wear by adding a solid lubricating coating (new function);
● Suppress cross-shoulder defects (new function) by rounding the channel ribs.
●High reliability (Figure 1)
Fatigue test result
Life expectancy is extended by optimizing internal technical parameters and using UE/HTF in the ferrule. In addition, the EQTF is applied to the ball, and the plastic cage is used instead of the conventional cage to suppress the deterioration of the surface roughness of the ball during the operation of the bearing, and the service life is longer. In addition, by using the anti-creep technology that increases the rigidity of the outer ring and the addition of a solid lubricating coating, it is possible to suppress an increase in CVT vibration caused by wear of the bearing housing.
● Torque reduction (Figure 2, Figure 3)
The plastic cage reduces the frictional resistance of the lubricant generated by the rotation of the bearing and reduces friction.
Figure 2 Relationship between dynamic friction torque and oil quantity
Figure 3 Relationship between dynamic friction torque and rotational speed
●Reduce size and weight
Long-life technology (UR, THE, and EQTF) is applied by optimizing internal technical parameters, and the size and weight can be reduced by using a biased channel and a shoulder trim to suppress stray abrasion.
BELTOP 8's long life, low torque, improved creep resistance, small size, and lightweight technology are not only suitable for belt-type continuously variable transmissions, but also for various transmissions, including automatic transmissions and electric vehicles/hybrids. Automotive Transmission. NSK's BELTOP 8 product includes projects based on basic technology, experience and achievements. It is a high reliability, low torque, small size and light weight for a belt-type continuously variable transmission that can be used in harsh environments. Rolling bearings are currently used in many belt CVTs.
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