Release time : 2015-06-10 09:55:56
Motor bearing code is composed of front code, basic code and post code. Then I'll introduce motor bearing code in detail so that you can familiar with every bearing code. Front code refers to bearing's sub-unit code, basic code refers to such main characteristics as bearing's type and size, and post code refers to bearing's precision and material.
1. Type code. O-double row angular contact bearing; 1-self-aligning ball bearing; 2-self-aligning roller bearing; 3-tapered roller bearing; 4-double-row deep groove ball bearing; 5-thrust ball bearing; 6-thrust ball bearing; 7-angular contact ball bearing; 8-cylindrical roller thrust bearing; N-cylindrical roller bearing; U-spherical surface ball bearing; QJ-four-point contact ball
2. Size code. We can combine bearing's width code(a digital) and outer diameter code(a digital) to express bearing with the same inner diameter and different outer diameter and width codes 8, 0, 1, 2, 3, 4, 5 and 6 represent increasing width size. Bearing with the same inner diameter and larger outer diameter can bear stronger carrying capacity. Generally, the common width is ''0''and isn't marked. But to tapered roller bearing and self-aligning roller bearing, ''0'' can't be ignored. Outer diameter code 7, 8, 9, 0, 1, 2, 3, 4 and 5 represent gradual increasing size.
3. Inner diameter code
4. Tolearance grade code. P0, P6, P5, P4, P2 represent gradual increasing tolerance grade increasing, corresponding to the old model of G, E, D, C and B.
5. Clearance code. C1,C2,CM,C0,C3,C4,C5 represent increasing clearance. CM is motor bearing clearance and C0 is basic clearance, which is not marked. Then let's do some exercises:
(1) N105/P5N- cylindrical roller bearing, 1- extra light series, 05-inner diameter 20mm, P5-tolerance grade, 0-basic clearance(not marked)
(2) 302133-tapered roller bearing, 0-common width, 2-light series, 13-inner diameter 65mm, 0-tolerance grade, 0-basic clearance(not marked)
(3) 7214C/P47-angular contact ball bearing, 2-light series, 14-inner diameter 70mm, C-Nominal contact Angle alpha = 15 , P4-tolerance grade, 0-basic clearance(not marked)