What is the contact angle of angular contact ball bearings?
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The original pump bearing model was 7207ACD, but this model is not available in the warehouse; therefore, 7207BECBM was used as a substitute. Now, the bearing housing produces abnormal noises when the pump is in operation. It is suspected that different contact angle values are the cause; what effects will this have? Are there any forum members who are particularly familiar with bearings?
Different contact angles result in different clearances. 7207ACD: This pattern does not have this version; A represents a contact angle of 25°, while CD has no specification given. 7207BECBM, CB represents the clearance
The contact angle of 7207ACD is 25 degrees, while that of 7207BECBM is 40 degrees
Could you specify what the effects would be?
I know this contact angle; could you explain it in more detail?
The contact angle ACD for 7207 is 25°； For 7207BECBM, both the contact angle B and BE are 40°; therefore, it can be determined that the contact angles of the two bearings are different, and as a result, the axial loads they can withstand also differ. In the case of BE, the steel balls are still enlarged, and the cage is made of glass fiber reinforced nylon 6.6 ； But the final M in 7207BECBM indicates that the cage is a solid lightweight alloy cage ； A contradiction has arisen. So E must have a separate meaning, or EC represents one meaning; however, EC is used for cylindrical roller bearings or self-aligning roller bearings, while 7 refers to angular contact ball bearings, so EC does not apply ； When E appears alone in angular contact ball bearings, it is used in double-row angular contact ball bearings, indicating that there is a ball loading port on one side of the bearing. CB has two meanings; in terms of its external design, it refers to a general-purpose paired single-row angular contact ball bearing that can be connected in series in various ways—face-to-face or back-to-back. When installed back-to-back or face-to-face, the internal clearance remains the same as the normal value before axial installation. Another meaning is regarding the bearing configuration: the internal clearance in CB is larger than that in CA (deep groove ball or angular contact ball bearings). M refers to the cage: a solid light-alloy cage. The above is the information for SKF; as for FAG bearings, the meaning is likely to be different.
That noise coming from the bearings? The contact angle has increased, which affects the precision; the material of the bearing cage has also changed. What kind of sound are you hearing?