FAG Super Precision Cylindrical Roller Bearings are used where the highest accuracy is required.Machine tools and printing machines are typical applications for these bearings. They are ideal floating bearings as the linear expansion during rotation is accommodated between rollers and raceways. Due to their high accuracy and high radial rigidity, Cylindrical Roller Bearings are, aside from use as floating bearings, employed in high precision designs for the following bearing arrangements:
• Radially rigid
• High load carrying capacity
• High precision.
The standard series N10 (single row) and NN30 (double row) are an integral part of the FAG Super Precision range. The series N19 and NNU49 are also described in this catalog. These series have a smaller cross-section, which permits, for example, lower center distances for
multiple-spindle arrangements. Diameter ranges not shown are available on request.The single row bearings of the series N10 and N19 can support very high radial loads. The rollers are guided on the inner ring and separated using a brass cage or a PEEK cage.The rollers on Double Row Cylindrical Roller Bearings of the series NN30.
are guided on the inner ring. The outer ring is ground cylindrical and is removable. The series NNU49 is designed the opposite way. In this case, the inner ring is ground cylindrical and is removable. Roller guidance is on the outer ring.The design of these bearings is indicated using the following standards:
• Accuracy class SP
• Tapered inner ring bore to radial
clearance/preload setting (taper 1:12) by adjusting axial displacement on the tapered seating surface of the shaft); (per request) cylindrical innerring bore
• Solid brass cage or PEEK cage
• Radial clearance C1.
High Speed Cylindrical Roller Bearings The internal design of N10..-HS
bearings is modified so as to permit even higher speeds. They are designed with steel rollers and a PEEK cage and reach a speed level
up to 60% higher than conventional Cylindrical Roller Bearings.Hybrid Cylindrical Roller BearingsThe rollers in FAG Hybrid Cylindrical Roller Bearings are made of high performance ceramic. The use of ceramic rollers significantly reduces friction and wear in the bearing. This reduces the demand on the lubricant and leads to lower temperatures. The “HCN” design therefore yields the maximum speeds permissible in Cylindrical Roller Bearings. The lower coefficient of thermal expansion for ceramic rollers also mitigates an increase in preload at elevated temperatures. The service lives of spindles and machines are significantly extended by using Hybrid Cylindrical Roller Bearings, making the systems noticeably more cost-efficient. Furthermore, ceramic rollers also increase rigidity both statically and dynamically. This exerts a positive influence on the machining quality.
Cylindrical Roller Bearings with half complement of rollers Under specification H193, Hybrid Cylindrical Roller Bearings and High Speed Cylindrical Roller Bearings are manufactured standard with half the normal number of rollers. Reducing the number of rolling elements allows the speed of these Cylindrical Roller Bearings to be further increased, at the expense of reduced radial rigidity. These HCN..-H193 and N10..-HS-..-H193 Cylindrical Roller Bearings are utilized in high speed main spindles in machine tools.
