605 deep groove ball bearings specification
| Deep Groove Ball Bearings No. | I.D | O.D | B | |||
| d | d | Open type | ||||
| mm | inch | mm | inch | mm | inch | |
| 605 | 5 | 0.1969 | 14 | 0.5512 | 5 | 0.1969 |
| Deep Groove Ball Bearings No. | B | Load Rating(KN) | Steel Ball Parameter | |||
| Closed type | Dynamic | Static | No. | Size | ||
| mm | inch | Cr | Cor | mm | ||
| 605 | 5 | 0.1969 | 1.07 | 0.42 | 8 | 2.000 |
| Deep Groove Ball Bearings No. | Max speed | Weight Kg | ||||
| Grease | Oil | |||||
| r/min | r/min | |||||
| 605 | 39000 | 46000 | 0.0037 | |||
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Bearing preload
Bearings generally have appropriate working clearance when in use. However, for micro and small motor bearings, in order to reduce vibration, sometimes an axial load is applied to the bearing in advance so that it has negative internal clearance. This practice is called preloading.
The purpose of preload
Improve radial or axial positioning accuracy, while reducing bearing run out, improving rotation accuracy, and preventing bearing noise caused by vibration and resonance.
Preloading method
There are two methods of applying preload: positioning preload and constant pressure preload. Its specific methods and characteristics are as follows:
Preloading methods and characteristics
| Method | Basic method | Applicable bearings | Preloading purpose characteristics |
| Positioning preload |
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Deep groove ball bearing | Positioning preload characteristics: a method of obtaining preload through the relationship between mechanical positions. The advantage is that the structural parts are simple and the rigidity is high. The disadvantages are that the preload changes greatly due to temperature changes and the preload fades due to wear. |
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Tapered bearings | ||
| Constant pressure preload |
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Deep groove ball bearing | Characteristics of constant pressure preload: A structure that uses elastic parts such as spiral springs and wave washers to apply preload to the bearings. The advantage is that it is less affected by temperature changes. The disadvantage is that it adds structural parts and reduces rigidity. |
