PPH bearings teach you how to choose bearings

1、 Selection of bearings

The main issue in the procurement of bearings is selection. PPH Bearing has compiled several key points about bearing selection for everyone. PPH Bearing provides you with one-stop bearing selection and procurement services:

1. The selection of bearing model: The bearing model is generally chosen by the user's technical personnel based on the usage conditions and load capacity of the supporting product. Business personnel mainly understand whether the actual load of the user is consistent with the selected bearing. If the bearing does not meet the usage requirements, they should advise the customer to change the model as soon as possible, but unless there are special products, there is generally no problem in selecting the model.

2. Selection of bearing clearance: Users usually only inform them of the model and grade when purchasing bearings, and rarely make requirements for bearing clearance. Business personnel must inquire about the operating conditions of the bearings, including their speed, temperature, and fit tolerance, which directly affect the selection of bearing clearance. Generally, motors with speeds below 3500 revolutions per minute use CM clearance, while high-temperature and high-speed motors require relatively large clearance. The clearance of the bearing will decrease after assembly due to the enlargement of the inner hole and the reduction of the outer circle. The reduction in clearance is equal to the interference fit multiplied by 60% (except for bearing chambers made of aluminum). For example, if the clearance before bearing assembly is 0.01mm and the interference fit during assembly is 0.01mm, then the clearance after bearing assembly is 0.004mm. In theory, the noise and lifespan of bearings reach their optimal state at zero clearance, but in practical operation, considering issues such as temperature rise, it is better for the clearance of bearings to be 0.002mm-0.004mm after assembly.

3. Selection of grease: The selection of grease is generally based on factors such as bearing speed, temperature resistance, noise requirements, and starting torque. Business personnel are required to have a good understanding of the performance of various types of grease.

4. Selection of bearing sealing type: Lubrication of bearings can be divided into oil lubrication and grease lubrication. Oil lubricated bearings are generally selected as formal bearings, while grease lubricated bearings are generally sealed with dust covers or rubber seals. Dust covers are suitable for areas with high temperatures or good usage environments. There are two types of seals: contact seals and non-contact seals. Contact seals have good dust resistance but high starting torque, while non-contact seals have lower starting torque but lower sealing performance than contact seals. PPH bearings have been professionally manufactured in industries such as automotive motor bearings, home appliance motor bearings, motorcycle bearings, and health motor bearings, achieving optimal noise and lifespan of the bearings.