high speed! high precision! ball bearing and ball bearing sizes

high speed! high precision! ball bearing and ball bearing sizes

Ball bearings

Ball bearings are a kind of rolling bearings. The ball bearings are installed in the middle of the inner ring and the outer ring and can withstand large loads. Also called ball bearings.
Structure and composition(ball bearing sizes)
The ball bearing is mainly composed of four basic elements: ball, inner ring, outer ring and retainer also called cage (cage or retainer). General industry ball bearings meet AISI 52100 standards, balls and rings are usually made of high chrome steel. Rockwell hardness (Rockwell C-scale hardness) is approximately between 61-65. The hardness of the retainer is lower than that of the ball and the ring, and its material is metal (such as medium carbon steel, Aluminum alloy) or non-metal (eg Teflon, PTEF, polymer materials). Ball bearings are more than journal bearings
The dynamic frictional resistance is small, so at the same speed, the frictional temperature will be lower. ball bearing sizes

Applications(ball bearing sizes):
The purpose of a ball bearing is to determine the relative position of two parts (usually a shaft and a bearing housing) and to ensure that they rotate freely while transmitting the load between them. 
At speeds (for example, in gyro ball bearings), this use can be expanded to include free rotation with virtually no wear in the bearing. In order to achieve this state, a layer can be used
The adhesive fluid film, which is an elastic hydrodynamic lubricating film, separates the two parts of the bearing. Denhardt (1966) pointed out that not only when the bearing bears the load on the shaft,
In addition, the elastic hydrodynamic lubricating film can be maintained when the bearing is subjected to preload so that the positioning accuracy and stability of the shaft do not exceed 1 micro-inch or 1 nano-inch.
Ball bearings are used in various machines and equipment with rotating parts. Designers often decide whether ball bearings or fluid film shafts should be used in specific applications. The following features make ball bearings more desirable than fluid film bearings in many situations.
1. The starting friction is small and the working friction is suitable.
2. Can withstand radial and axial joint loads.
8. Not sensitive to interruption of lubrication.
4. No self-induced instability.
5. Cold start is easy.
Within a reasonable range, changing the load, speed, and operating temperature have only a small effect on the good performance of the ball bearings.
The following features make ball bearings less desirable than fluid film bearings.
1. Limited changes in fatigue life.
2. The required radial space is large.
3. Low damping capability.
I. The noise level is high.
6. The stricter requirement for the middle.
6. higher cost.ball bearing sizes
According to the above characteristics, a piston film engine generally employs a fluid film bearing, and a jet engine almost exclusively uses a ball bearing. Various types of bearings have their own unique advantages.
At a given point, the most suitable bearing type should be carefully selected for a given application. The British Engineering Scientific Data Organization (ESDU 1965, 1967) has been the selection axis
Adhering to this important issue provides useful guidelines.

About the related ball bearing sizes:

6000	10*26*8	6200	10*30*9	6300	10*35*11
6001	12*28*8	6201	12*32*10	6301	12*37*12
6002	15*32*9	6202	15*35*11	6302	15*42*13
6003	17*35*10	6203	17*40*12	6303	17*47*14
6004	20*42*12	6204	20*47*14	6304	20*52*15
6005	25*47*12	6205	25*52*15	6305	25*62*17
6006	30*55*13	6206	30*62*16	6306	30*72*19
6007	35*62*14	6207	35*72*17	6307	35*81*21
6008	40*68*15	6208	40*82*18	6308	40*90*23
6009	45*75*16	6209	45*85*19	6309	45*100*25
6010	50*80*16	6210	50*90*20	6310	50*110*27
6011	55*90*18	6211	55*100*21	6311	55*120*29
6012	60*95*18	6212	60*110*22	6312	60*130*31
6013	60*100*18	6213	65*120*23	6313	65*140*33
6014	70*110*20	6214	70*125*24	6314	70*150*35
6015	75*115*20	6215	80*130*25	6315	75*160*37
6016	80*125*22	6216	80*140*26	6316	80*170*39
6017	85*130*22	6217	85*150*28	6317	85*180*41
6018	90*140*24	6218	90*160*30	6318	90*190*43
6019	95*145*24	6219	95*170*32	6319	95*200*45
6020	100*150*24	6220	100*180*34	6320	100*215*47
6021	105*160*26	6221	105*190*36	6321	105*225*49
6022	110*170*28	6222	110*200*38	6322	110*240*50
6024	120*180*28	6224	120*215*40	6324	120*260*55
6026	130*200*33	6226	130*230*40	6326	130*280*58
6028	140*210*33	6228	140*250*42	6328	140*300*62
6030	150*225*35	6230	150*270*45	6330	150*320*65
6032	160*240*38	6232	160*290*48	6332	160*340*68

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