Bearing is a part that guarantees the mobile connection between two elements of a mechanism., allowing between them to rotate. It is intended to allow rotation under load, accurately and with minimal friction.
The Foundation
The concept behind a bearing is quite simple.: things run better than they slide. The wheels of your car are like big bearings.. If you had something like skis instead of wheels, your car would have much more difficulty riding on the roads.
This is because when things slide, ofriction between them causes a force that tends to slow them down. Although, if two surfaces can rotate about each other, the friction will be much less.
The bearing consists of:
- two rings linked, one to the fixed element and one to the movable element;
- rolling body (spheres, rolls,etc) that allow the displacement of the rings;
- Cage, that separates the rolling elements.
Divided into two large Families:
- Ball Bearings (Higher Speed, Silent Operation, Lower Load);
- roller bearings (Lower Speed, Highest level of noise, Higher Load).
The technical terms used for bearing components, were established through ISO 5593.
Tip: Select and Download 3D Blocks for Bearings and Bearings Here: SKF 3D BLOCKS
General Rating of Bearings:
Radial contact with one or two ball rows:
- Large selection of dimensions;
- Best cost x benefit;
- Several constructive options (Protection, seal, etc);
- wide use, mainly electric motors.
Oblique contact with a row of balls:
- Supports radial and axial loads;
- Always used together, supporting axial loads in both directions;
- Mounted always in opposition to each other;
- great stiffness;
- Used in some gearboxes and machine spindles.
Oblique contact with two rows of balls:
- Supports radial and axial loads in both directions;
- Can be used alone;
- Use on car wheels, reducers, etc.
four points of contact:
- Support axial loads in both directions;
- They are usually associated with a radial contact bearing;
- Employees at Speed reducers.
Sphere autocompensator:
- Allows angular displacement;
- Finds application in long and flexible shafts.
Roller Sphericals:
- Allows angular displacement;
- Employed for large load requests and possible misalignment;
- big reducers, big fans, quarry machines, etc.
cylindrical rollers:
- Excellent resistance to instantaneous overloads and shocks;
- separable elements, simplifying the assembly;
- big electric motors, rolling mill, etc.
Tapered roller with a row of rolling elements:
- Always mounted opposite another bearing of the same type;
- Great rigidity in the assembly;
- Used on heavy vehicle wheels, gearbox shaft, shafts, etc.
Tapered roller with two rows of rolling elements:
- Support axial loads in both directions;
- Usually used as a double bearing.
needles:
- They admit high radial loads in a small space with great rigidity.
Ball Anchor:
- Exclusively support axial load;
- Usually associated with a radial bearing.
Self-aligning roller strut:
- Support radial and axial forces, admitting a certain degree of misalignment;
- Employees on heavy vertical axles, injection spindles, etc.
Here are some great materials for bearing analysis and selection.:
Tip: Log in and use the bearing selection tool: Selection of Bearings and Bearings