Model Selection: Bearing models are generally selected by the user's technical staff based on the operating conditions and loads of the supporting products.
Business personnel primarily assess whether the user's actual loads are compatible with the selected bearings. If the bearings do not meet these requirements, they should promptly advise the customer to select a different model. However, unless the product is a special case, model selection is generally not an issue.
2. Clearance Selection: When purchasing bearings, users typically only specify the model and grade and rarely specify the required clearance. Professional sales personnel will inquire about the operating conditions, including the speed, temperature, and fit tolerances, all of which directly impact the selected bearing clearance.
Generally, motors operating below 3500 rpm use a CM clearance. High-temperature, high-speed motors require a relatively large clearance. Bearing clearance decreases after assembly due to the expansion of the inner bore and the reduction of the outer diameter. The reduction in clearance is calculated as the interference fit x 60% (except for aluminum bearing housings). 3. Grease Selection: Grease selection is generally based on the bearing's speed, temperature resistance, noise requirements, and starting torque. This requires a thorough understanding of the properties of various greases.
4. Bearing Seal Selection: Bearing lubrication can be categorized as either oil or grease. Oil-lubricated bearings are typically sealed with a grease seal, while grease-lubricated bearings are typically sealed with a dust cover or rubber seal.
Dust covers are suitable for high-temperature applications or those requiring high operating environments. Seals are categorized into contact and non-contact types. Contact seals offer superior dust protection but high starting torque, while non-contact seals offer lower starting torque but less robust sealing performance.