What bearings should be selected for marine motors

Marine motor products are machines that convert electrical energy into mechanical energy. Directly related includes the selection of bearings for marine motors. The bearing capacity of the bearing must match the power and torque of the marine motor, and the size of the bearing must match the physical space of the relevant components of the marine motor.

The magnitude of bearing load is usually one of the main determining factors for bearing size. Roller bearings generally have higher load-bearing capacity than ball bearings of similar size; Full roller bearings can withstand heavier loads than corresponding bearings with retainers. Ball bearings are commonly used for medium and small loads; Under heavy load and large shaft diameter conditions, the selection of roller bearings is relatively safe and reliable.

In many cases, choosing the type of bearing requires considering many factors and weighing the pros and cons of these factors. Important factors to consider when selecting a standard bearing type include allowable space, load, misalignment, accuracy, speed, noise, stiffness, axial displacement, installation and disassembly, embedded seals, load size and direction, etc.

The NU and N-type cylindrical roller bearings commonly used in small and medium-sized marine motor products can only withstand pure radial loads; Deep groove ball bearings can withstand a certain axial load, namely combined load, in addition to radial load.

Various types of bearings have unique characteristics due to their design. These characteristics make certain types of bearings show a trend of being applied. For example, deep groove ball bearings can withstand moderate radial and axial loads. This type of bearing has low friction and can provide various designs such as high precision and low noise, making it particularly suitable for small and medium-sized marine motors. Spherical roller bearings can withstand heavy loads and have the characteristic of self-aligning. Therefore, it is suitable for heavy-duty machinery with heavy loads, axis deviation, and unbalanced working conditions.

In most cases, the characteristics of a bearing depend not only on its design. For example, the bearing configuration of angular contact ball bearings or circular chain roller bearings has a stiffness that is related to the applied preload force. The speed of the bearing is affected by the accuracy of the bearing and related components, as well as the design of the cage.

Important considerations for bearing configuration design include load capacity and rated life, friction, allowable speed, internal clearance or preload of bearings, lubrication and sealing, etc. A smaller diameter shaft can be used for most ball bearings. The commonly used ones are deep groove ball bearings; And needle roller bearings. Cylindrical rollers, tapered rollers, self-aligning rollers, and deep groove ball bearings can be used for shafts with larger diameters. When the radial space is limited, bearings with smaller cross-sections should be selected.

For relatively mature marine motor bearing system schemes, the selection of bearings and the tolerance fit relationship of related parts have been basically determined, but the design and bearing selection of new marine motor bearing systems should be more cautious. In practical applications, many marine motor manufacturers have a fairly arbitrary choice of bearing clearance. Choose the same type of bearing for marine motors with different pole numbers and operating conditions. It's obvious that there's a problem. We will communicate with everyone regarding specific fault safety issues.