The types of bearings commonly used in mechanical arms and their application points

The types of bearings commonly used in robotic arms include:

1. Deep groove ball bearing: suitable for high-speed, low load scenes, low friction, low noise.
2. Angular contact ball bearings: can withstand radial and axial loads, suitable for high-precision and high-rigidity requirements.
3. Cylindrical roller bearings: strong bearing capacity, mainly used in high radial load scenarios.
4. Tapered roller bearings: can withstand both radial and axial loads, suitable for heavy duty applications.
5. Cross roller bearings: high rigidity and accuracy, suitable for rotation and swing movement.
6. Aligning ball bearing: can automatically aligning, suitable for shaft and bearing seat misalignment.
7. Thrust ball bearing: mainly used to bear axial load, suitable for low speed occasions.
8. Linear bearing: used for linear movement, small friction, smooth movement.
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Factors such as load, speed, accuracy, rigidity and environment should be considered when selecting bearings.

In the application of mechanical arm, the technical indicators of bearings are crucial, mainly focusing on the following points:

1. Load capacity

- Radial load: The force perpendicular to the axis that the bearing can bear.

- Axial load: the force that the bearing can bear along the axis.

- Dynamic load: the load capacity of the bearing in motion.

- Static load: the load capacity of the bearing at rest.

2. Accuracy

- Rotation accuracy: the deviation of the bearing when rotating affects the positioning accuracy of the mechanical arm.

- Dimensional accuracy: the dimensional tolerance of the bearing, which affects the installation and fit.

3. Rigidity

- Radial rigidity: the ability of the bearing to resist radial deformation.

- Axial rigidity: the ability of the bearing to resist axial deformation.

   4: Speed

- Limit speed: the highest speed of the bearing under certain conditions.

- Allowable speed: the safe speed of the bearing in practical application.

5. Friction and temperature rise

- Friction coefficient: the friction characteristics of the bearing, affecting efficiency and temperature rise.

- Temperature rise: The temperature of the bearing increases during operation, affecting the life and performance.

6. Longevity

Fatigue life: the time or number of times the bearing runs before fatigue failure.

- Wear life: the running time before the bearing fails due to wear. 

  7. Lubricate

- Lubrication method: such as grease lubrication, oil lubrication, etc.

- Lubricant type: such as mineral oil, synthetic oil, etc.

8. Sealing and protection

- Sealing performance: prevent contaminants from entering and lubricant leakage.

- Protection level: such as IP level, dust and water resistance.

9. Installation and maintenance

- Installation mode: such as pressing type, hot loading type, etc.

- Maintenance requirements: such as lubrication cycle, inspection frequency, etc.

10. Environmental adaptability

- Temperature range: the temperature range within which the bearing can work normally.

- Corrosion resistance: Durability in corrosive environments.

11. Vibration and noise

- Vibration level: the vibration of the bearing during operation.

- Noise level: the noise level of the bearing during operation.

12. Materials

Bearing materials: such as steel, ceramics, etc., affect performance and life.

- Cage materials: such as steel, plastic, etc., affect high-speed performance.

 Comprehensive consideration of these indicators can ensure the reliability and performance of bearings in the mechanical arm.