Problems that should be paid attention to when using variable speed INA self-aligning ball bearings

1. Understand the shape and connection dimensions of the variable speed drive INA self-aligning ball bearing.
2. Variable speed drive INA self-aligning ball bearings can be placed horizontally or vertically or tilted. Can be rotated forward and backward. Positive and negative input and output power.
3, variable speed drive INA self-aligning ball bearings regardless of the installation method, and its couplings have size requirements.
Recommended:
The inner ring hole d and the shaft are matched by H7/h6;
The pin hole do of the middle ring and the transmission are matched by H7/r6;
The outer ring D and the housing are matched by H8/h7;
The gear is matched with the hole on the output shaft by a clearance fit, and the gap is 0.2~0.5mm.
4. Axial positioning of the variable speed drive INA self-aligning ball bearing: After any three turns of the ring are axially positioned, the other two axes do not need to be axially positioned.
5. Positioning in the direction of rotation; both the outer ring and the inner ring are flat key positions. The middle circle is positioned by the drive.
6. Variable speed drive INA self-aligning ball bearings can withstand small external forces in the radial direction, but should not withstand large working loads.
7. Transmission ratio is the transmission ratio according to the first installation method. If other installation methods are used, the gear ratio should be calculated.
8. At the rated speed (1500 rpm), select the variable speed drive INA self-aligning ball bearing model according to the transmission ratio and the required power (Kw).
9. When based on the working torque, the model number should be selected accordingly.
10. The selection of the reducer model should be consistent with the model of the variable speed drive INA self-aligning ball bearing.

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NTN bearing material and the cause of overheating

Friction compatibility
The shaft diameter prevents direct adhesion and boundary lubrication when in direct contact with the bearing pads. The material factors that affect the frictional compatibility of the friction pair are:
(1) The degree of difficulty in forming an alloy by metallurgical materials.
(2) Affinity of materials and lubricants.
(3) The friction factor of the auxiliary material in the non-lubricated state.
(4) The microstructure of the material.
(5) Thermal conductivity of the material.
(6) The size of the surface energy of the material and the characteristics of the oxide film.
2. Clamping
The material allows the ability of the foreign hard particles in the lubricant to be clamped in to prevent scratching or (and) abrasive wear. For metal materials, the hardness is low and the modulus of elasticity is low, the clamping force is good, and the non-metallic material is not necessarily, for example, carbon graphite, the modulus of elasticity is low, but the clamping property is not good. NTN bearings typically use a softer material to form a frictional web with a harder material, typically a softer material.
3. Running-in
In the running-in process of the shaft diameter and the bearing bush, the shaft diameter and the bearing machining error, the coaxiality error, and the surface roughness parameter value are reduced, so that the contact is uniform, thereby reducing the friction and wear rate.
4. Friction compliance
The material compensates for the initial poor fit of the sliding friction surface and the flexural behavior of the shaft by the elastoplastic deformation of the surface layer. Materials with low modulus of elasticity have better compliance.
5. Abrasion resistance
The ability of the secondary material to resist wear. Under the specified wear conditions, the wear resistance is indicated by the wear rate or the degree of wear and the reciprocal of the amount of wear.
6. Anti-fatigue
The ability of a material to resist fatigue damage under cyclic loading. At the temperature of use, the strength, hardness, impact strength and tissue uniformity of the bearing material are important to combat fatigue. Materials with good running-in and good clamping properties usually have poor fatigue resistance.
7. Corrosion resistance
The ability of the material to resist corrosion. Lubricating oils will gradually oxidize when used in the atmosphere, producing acidic substances, and most of the lubricating oils also contain extreme pressure additives, which will corrode the bearing materials. Therefore, NTN bearing materials need to have corrosion resistance.

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