High Ability Series
Development and Mass Production of
Grease-Lubricated Angular Contact Ball Bearings
with Lower Temperature Increase for Machine Tool Spindles
- Customer outlineManufacturers of machine tools and spindles in a variety of international markets
- ProductMachine tool spindles
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Problems
- The temperature increase on the spindle, induced by bearing temperature-rise, causes the thermal expansion of the spindle and possibly deteriorates the machining accuracy
- The grease breaking-in requires a long time
- The grease’s service life is shortened
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Solutions and Results
- Optimization of the shape of the cage pocket and
the clearance between the inner ring and the cage - Improvement of the contact condition of the ball and cage
- Improvement of grease fluidity
- Optimization of the shape of the cage pocket and
Achievements
- Lower temperature increase on the spindle
- Reduction in wearing-in time of the grease
- The grease’s service life (calculated metric) is increased
Comments from Our Customers
- The optimization of both the shape of the cage pocket and the clearance between the inner ring and the cage allowed us to achieve lower spindle temperature rise. This led to an improvement in our spindle production yield rate (a decrease in the number of rejections due to large increases in temperature upon shipping and testing).
A Message from JTEKT
We consider cage improvements to be important to reducing the temperature incease of bearings, so we set our eye on the “pocket shape” and “clearance between the inner ring and the cage” and proceeded with development.
Lowering the temperature increase of bearings contributes greatly to improved commodity power for machine tool spindles, so we will continue striving for improvements going forward.
Product
High Ability Series for Machine Tool Spindles
Grease-Lubricated Angular Contact Ball Bearings
with Lower Temperature Increase
- Optimization of the shape of the cage pocket and the clearance between the inner ring and the cage
- Improved the contact condition of the ball and cage
- Improved grease fluidity
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