A linear ball bearing is a direct motion system for linear travelling, and it is used in conjunction with a cylindrical axis. Due to the ball bearings contact with the bearing ball outer point, the steel ball rolling with minimal frictional resistance, so the linear bearing has the characteristics of low friction, relatively stable, and does not change the speed of the bearing, and can obtain a stable linear motion with high sensitivity and high accuracy.
Linear ball bearings have abroad application, and it is widely used in precision equipments, such as tensile testing machines, and digital three-dimensional coordinate measuring equipments, multi-axis machine tools, punches, tool grinders, automatic gas cutting machines, printers, card sorters, food packaging machines, and other industries.
Linear ball bearing adjustment type, open type bearing inner and outer diameter are measured before the cut, there will be some elastic deformation after the cut, and the clearance should be measured in the bearing housing (steel retainer bearings, KH bearings are similar).
The adjustment direction of the adjustable bearing seat should be perpendicular to the direction of the bearing cutout to ensure uniform clearance. The linear bearing structure cannot be rotated and requires the right guidance. Therefore, linear ball bearings generally use two shafts and four sets. The bearings or two shafts + two sets of extended bearings are used in a combination. The two shafts must be installed straight. After the entire assembly is assembled, the drive mechanism must be flexible and non-blocking by hand. The drive power must be sufficient to overcome bearing friction. Resistance, linear ball bearing friction resistance is approximately one-thousandth of the working load.
Linear ball bearings are used in connection with hardened linear drive shafts as a system for infinite linear motion. Because the load ball and the hardened drive shaft are in point contact, the allowable load is very small, but when moving in a straight line, the friction resistance is minimal, the accuracy is high, and the movement is fast.
NTN 6203 bearing is the most representative rolling bearing, which is widely used. It is suitable for high-speed and even high-speed operation, and it is very durable and does not require frequent maintenance. This type of bearing has a small friction coefficient, high limiting speed, quite simple structure, very low production cost, and easy to achieve high manufacturing accuracy. The size range and form are various.
NTN 6203 bearing is used in precision instruments, low-noise motors, automobiles, motorcycles, and general machinery. It is the most widely used type of bearing in the machinery industry. It mainly bears the radial load and can also bear a certain amount of axial load.