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Angular contact ball bearings

1. product specification:

(1) precision: P2, P4, P5, P6, P0

(2) process range: from id 35 mm to OD 1600 mm

(3) clearance: normal

(4) material: GCr15, GCr15SiMn

(5) series: 71900, 7000,7200, 7300, 71800 series

(6)structure: AC, C, B , with contact angle 25, 15, 40 degree, brass cage or nylon cage

(7) service: OEM services provided

2. export to :

Germany, Spain, Italy, Austria, Singapore, South Korea, England, Australian, Taiwan, and other countries.

3. delivery time:

45~50 days after receive deposit

4. term of payment:

(1) 100% L/C at sight;

(2) T/T 30% of total amount as deposit, the balance 70% Before Shipment;

(3) 30% T/T in advance.70% L/C at sight.

5.contact information:

Contact: Joy Jia

Tel: +86-411-62581257 Fax: +86-411-85502763

Mobile NO.: +86 13009476658

7210BM, 7211BM, 7213BM, 7214BM, 7215BM, 7216BM, 7217BM, 7218BM, 7219BM, 7220BM, 7221BM, 7222BM, 7224BM, 7226BM, 7228BM, 7230BM, 7232BM, 7234BM, 7236BM, 7238BM, 7240BM, 7244BM, 7248BM, 7252BM, 7256BM, 7260BM, 7264BM, 7268BM, 7272BM, 7276BM, 7280BM

We produce special precision angular contact ball bearings for machine tool and other applications where requirements regarding accuracy and speed are high.

Precision angular contact ball bearings are non-separable and are essentially single row angular contact ball bearings. In all such bearings the load is transmitted from one raceway to another at an angular to the bearing axis. These bearings can therefore carry axial loads acting in one direction in addition to radial loads. Axial forces produced in the bearing when subjected to a radial load must be counteracted by an opposing force applied externally. The bearings are therefore adjusted against a second bearing.

The internal design of precision angular contact ball bearings differs appreciably from that of standard single row bearings and reflects the late state of the art where machine tool bearings are concerned. Only one flange on one ring has reduced height; the contact angles are small, and lightweight one-piece cages with a large number of balls are incorporated.

Precision angular contact ball bearings:

Precision angular contact ball bearings are available in those dimension series-bearing series719,70,72-with an contact angle of 15 degree (designation suffix C), 25 degree (designation suffix AC) or 40 degree (designation suffix B). Beatings with the larger contact angle are recommended for applications where high axial stiffness and high axial load carrying capacity are required.

The bearings have recently been redesigned as part of the continuous product development programme. Modified ball/raceway contact conditions, a new outer ring centred cage and more or larger diameter balls have enabled stiffness and load carrying capacity of the bearings to be enhanced, while permitting the bearings to operate at even higher speeds.

Each bearing series has its typical characteristics, which make it suitable for particular applications. If there is little radial space available, or if very high speeds occur, bearings of series 719 or 70 should be chosen. For heavy loads at relatively moderate speeds then bearings of series 72 are more appropriate. Where stiffness requirements are paramount, bearings of series 719 have the advantage that large spindle diameters can be used. They also incorporate a large number of balls. Both these factors contribute to a high stiffness of the spindle system: spindle stiffness increases with increasing spindle diameter and bearing stiffness is more strongly influenced by the number than by the size of the balls. In fact the stiffness of these light-series bearings is greater than that of bearings from the heavier series.

Matched bearings sets:

Depending on requirement, precision angular contact ball bearings may also be supplied as complete sets of two, three, four or five bearings.

These bearing sets are matched in manufacture so that when the bearings are mounted immediately adjacent to each other, the predetermined value of the preload will be obtained. The bore and outside diameters of bearings belonging to a matched set will not differ by more than half the permissible diameter tolerance. There will be even less difference between the diameters of matched bearings to tolerance class P4.

The load lines of bearings arranged back-to-back diverge towards the bearing axis. Axial loads can be accommodated in both directions, although only by one bearing (or bearings in tandem ) at a time. The back-to-back arrangement is relatively stiff and can also take up tilting moments.

The load lines of bearings arranged face-to-face converge towards the bearing axis. Axial loads can be accommodated in both directions, although again, only by one bearing (or bearings in tandem ) at a time. The arrangement is not so stiff as the back-to-back arrangement and is less suitable for tilting moments.

In a tandem arrangement, the load lines of the bearings are in parallel. Radial and axial loads are in parallel. Radial and axial loads are equally distributed over the bearings,but axial loads can only be carried in one direction. A set of bearings in tandem is therefore generally adjusted against another bearing which can take the axial loads acting in the opposite direction.

Combinations of tandem and back-to-back or tandem and face-to-face are normally used when the design makes it impossible to adjust a further bearing or bearing set against the tandem set.