As a general rule, ball bearings are used at higher speeds and lighter loads than are oller bearings. Roller bearings perform better under shock and impact loading.
Ball bearings are usually sold as assemblies and are simply replaced as units. Roller bearings can often be disassembled and the roller carrier and rollers, or the outer or inner races, replaced individually. Rear-wheel-drive cars use such arrangements for the front wheels. The advantage of this design is that the races can be shrunk fit onto shafts and into housings to create permanent assemblies without risking damage to the rollers themselves.
Single-row ball bearings are standardized and can be used interchangeably among manufacturers. Roller bearings are less-formally standardized so a specifier needs to consult a manufacturer's catalog to select one appropriate for the application.
Rolling element bearings are manufactured with a certain amount of internal clearance. Any misalignment that merely nudges a ball out of position and removes this internal clearance should not have much effect on the life of the bearing. Roller bearings are more sensitive to angular misalignment. For instance, a ball bearing running at moderate speed with a farly loose fit might operate successfully with angular misalignment as high as 0.002 to 0.004 in./in. between the bearing and shaft. A cylindrical roller bearing, in comparison, might be in trouble if misalignment exceeded 0.001 in./in. Manufacturers will generally provide acceptable ranges of angular misalignment for their individual bearings.
ZWA is looking for distributors all over the world. If you are a quality-oriented distributor, if you suffer from long term delivery and after-sale service, if you want to increase the profit, contact us. ZWA bearings live up your expectations.
From the set-up of ZWA, we have aimed at producing high-quality bearings and serving for high-end customers. In the past years, ZWA has become bearing suppliers of many GLOBAL FORTUNE 500.
ZWA has two in-house testing labs. One is testing the physical and chemical components of the raw materials and parts after heat treatment. The other is testing the geometric dimension and tolerance of components and complete bearings. With those two labs, ZWA is able to make every process of production under high-quality control.
ZWA cooperates with the same components suppliers of SKF, FAG and TIMKEN home and abroad. Those suppliers cover from raw material, forging to cage and rollers. If not with the support from those suppliers, ZWA bearing's quality can't be improved so greatly and precisely.
ZWA offers both on-site sales service and after-sale service. ZWA's professional engineer team is able to source out the reasons for bearing failure by analyzing the working condition, the bearing failure pictures or on-site checking. ZWA guarantees to response within 24 hours.
With abundant experience in producing and designing, ZWA is able to offer customized design and production. This service has favored so many customers to increase the efficiency and educe the cost.