Cage keeps bearings in line and lubricated

July 12, 2001
Ball-to-ball friction in bearings generates heat, limits the speed, and shortens the life of linear-motion guides.

 

Ball-to-ball friction in bearings generates heat, limits the speed, and shortens the life of linear-motion guides. To solve these problems, engineers at THK designed a caged-ball system that places recirculating bearings in a retainer, or cage, that separates and aligns the bearings. The cage creates a bearing chain with spaces, or grease pockets, to hold lubricant and keep the bearings from touching each other.

Separating the bearings provides several benefits. Because the bearings are not in contact with one another, there is much less metallic noise during operation. The lack of bearing-to-bearing contact also decreases wear and allows room for lubricant, two factors which promote long-term, maintenance-free operation. Meanwhile, the lack of bearing noise or vibration means rolling resistance is more uniform, keeping performance of the linear guide consistent. And reduced heat levels and low bearing stresses lets the linear guide move at higher speeds.

The caged-ball technology is especially well suited for medical devices and semiconductor-inspection applications, according to THK, and is available in a wide variety of linear-guide models.

Sponsored Recommendations

April 16, 2025
Clean. Compact. Less heat.
April 16, 2025
SEW-EURODRIVE Introduces DR2C motor, IE5 Ultra-Premium Efficiency Motor
March 31, 2025
Unlike passive products - made of simple carbon springs - the bionic prostheses developed by Revival Bionics are propulsive, equipped with a motor and an artificial Achilles tendon...
March 31, 2025
Electric drives are a key technology for the performance of machines, robots, and power tools. Download this guide for an introduction to high-quality mechatronic drive systems...

Voice your opinion!

To join the conversation, and become an exclusive member of Machine Design, create an account today!