1, deep groove ball bearings
These bearings are generally used to bear radial load, because the clearance is not adjustable, so commonly used in less precision, without pretension occasions, such as the common drilling spindles.
2, angular contact ball bearings
Such bearings can support radial and axial loads, since the radial load will cause an internal axial force, and hence, to install and use, and its configuration are "back to back", "face to face", "series" and " multi-joint ", and by preload can increase the stiffness of the spindle. These bearings have a contact angle of 15 °, 25 °, 40 ° three, including a contact angle of 15 ° of B7000CY-precision angular contact ball bearings are special bearings designed for high-speed grinder spindle design, in addition to the internal structure of the bearing design changes, rings and rolling elements are made of high-quality bearing steel slag. Cage material phenolic cloth laminated tube, tolerance levels have 5,4 and 2. Therefore, these bearings have high rotational accuracy and speed limits, low friction, low temperature rise.
3, two-way thrust angular contact ball bearings
Usually used 230,000 two-way thrust angular contact ball bearings, the contact angle of 60 °, made a hole in the seat with lubricating oil, two shaft washer, a spacer and two ball and cage components. Select the appropriate spacer height of the bearing assembly after having a desired preload.
Such bearings can withstand axial load, with good rigidity, the normal lubrication, low temperature, high speed, and easy assembly and disassembly, as a new structure, currently used for grinding machines, lathes, boring, milling, drilling and other spindle on, often with the use of double row cylindrical roller bearings group with.
4, double row cylindrical roller bearings
These bearings can withstand greater radial load and allows a higher speed. Bearing in two rows of rollers arranged in a cross pattern, rotation fluctuation frequency than single row bearings double the amplitude reduced by 70%. Such bearings are commonly used in two forms: NN30 / W33, NN30K / W33 two series bearing inner ring with ribs, outer ring separable; NNU49 / W33, NNU49K / W33 series bearing outer ring with two ribs, internal separable ring, which NN30K / W33 and NNU49K / W33 series inner ring tapered bore (taper 1:12), and the tapered shaft journal mate, axial movement of the inner ring, the inner ring can swell to reduce even small bearing clearance bearing preload. Cylindrical bore bearings usually thermal loading, using an interference fit reduced bearing clearance, or preload to achieve the purpose. NNU49 series of separable bearing inner ring, the inner ring mounted in the spindle generally made after finishing the raceway, to obtain a high precision spindle rotation.
5, tapered roller bearings
Both radial and axial loads, double row tapered roller bearings can withstand axial load. Due to sliding friction between the child tapered roller large end and the inner wall, the speed limit is often lower than the same size cylindrical roller bearings. Hollow tapered roller bearings available oil cooling roller, so that the temperature rise reduced, thereby increasing the permissible speed. But this bearing complex manufacturing process, the machine lubrication system requirements are also higher, generally used only for the special requirements of horizontal spindle.
