Linear contact bearings are found in cylindrical roller bearings that include raceways and spacers. capacity to support mostly radial loads. Because there is less friction between the ferrule’s collar and the rolling element, high-speed rotation is appropriate.
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A ring can be classified as single-row cylindrical roller bearings (NU, NJ, NUP, N, NF) or double-row cylindrical roller bearings (NNU, NN) based on whether or not it contains ribs. The inner and outer ring structures of the bearing are removable.
The inner and outer rings of cylindrical roller bearings with spacers and no ribs on them can move substantially in the axial direction, allowing them to be utilized as free-end bearings. A certain amount of axial load in one direction can be supported by cylindrical roller bearings with double ribs on one side of the inner and outer rings and a single ridge on the other. Typically, solid copper alloy cages or stamped steel cages are utilized. Some, nevertheless, employ molding cages made of polyamide.
You must become proficient in high-temperature bearing modeling in order to select appropriate Cylindrical roller bearings with spacers. These considerations include size constraints, speed, stiffness, tolerance, installation, and disassembly.
1. Size restriction
(1) Space is typically at a premium when it comes to the installation of cylindrical roller bearings with spacers.
The machine’s design and its limitations frequently have an impact on the shaft diameter or the inner shaft diameter. As a result, the inner diameter of the bearing influences the choice of bearing type and size. The internal diameter serves as the foundation for the primary size tables of the bearings.
The bearing’s type, size, orientation, and the pressure exerted on it are all varied, as is the load of the high-temperature bearing.
Typically, the dimension table displays the rated continuous load. However, other important considerations for choosing the correct bearings include axial load, radial load, etc.
2. Velocity
The high-temperature bearing’s type, size, precision, cage type, load, lubrication technique, and cooling method all affect speed.
The dimensional precision bearings’ speeds under oil and grease lubrication are listed in the bearing table. In actuality, self-aligning ball bearings, cylindrical roller bearings, and deep groove ball bearings are suitable for high speed applications.
3. The ability to tolerate
The ISO and JIS standards serve as the foundation for the dimensional and rotational precision of cylindrical roller bearings with spacers.
It is advised to use bearings with an accuracy level of five or above for machinery that has to operate at high speeds and with extreme precision. High running precision machines can benefit from deep groove ball bearings, radial thrust ball bearings, or cylindrical roller bearings.
4. Stiff
Elastic deformation takes place when pressure is applied to the contact surface of the raceway and the moving body of the bearing. It’s necessary for some machinery to reduce elastic deformation. Compared to ball bearings, roller bearings experience less elastic deformation. Preloading bearings is sometimes necessary to improve rigidity.
(2) Deep groove ball bearings, radial thrust ball bearings, and tapered roller bearings are the typical applications for this program. The eccentricity of the inner and outer rings is caused by the mismatch between the inner and outer rings, the shaft being bent, and the rod or bearing box’s tolerance changing.
(3) Self-aligning ball bearings, self-aligning roller bearings, or self-aligning bearing seats are preferable options to keep the odd angle from growing too big.
(4) Moveable bearings are made using high-precision scales, which results in minimal voice and torque frequencies.
(5) There are special needs for low noise and low torque when using deep groove ball bearings and cylindrical roller bearings together.
5. Setup and takedown
(1) To guarantee inspection and maintenance, some applications call for regular disassembly and installation.
The bearings that are suitable for installation on both the inner and outer rings include:
For this kind of situation, tapered, needle, and cylindrical bearings are excellent choices.
The installation procedure is also made simpler by self-aligning roller bearings with a shaft sleeve and tapered bore self-aligning ball bearings.
FAQ
Are low friction cylindrical roller bearings?
Indeed. Cylindrical roller bearings are capable of handling high loads with minimal friction because of the way their surface and rollers are constructed.
Why do cylindrical roller bearings break down?
The most frequent causes of bearing failure are dirt and impurities, improper installation and sealing, and lubrication failure. Furthermore, overloading may cause a malfunction or overheating.
Which maintenance protocols must I to adhere to?
Like all bearings, cylindrical roller bearings can develop chips, corrosion, pitting, and scratches. By averting these situations, bearings coated with a surface coating contribute to an extended bearing life.
How should I treat the surface of a cylindrical roller bearing?
Zinc and phosphate coatings, as well as zinc-nickel plating, offer resistance to chipping, pitting, corrosion, and scratches.
What distinguishes cylindrical roller bearings from needle bearings?
Nebula-bearing rollers have a length to diameter ratio higher than 4. In comparison, a cylindrical roller bearing has shorter rollers with a bigger diameter.