German NILOS bearings, NILOS models, NILOS prices

NILOS bearings can simultaneously withstand radial and axial loads. They can operate at higher speeds. The larger the contact angle, the higher the axial load capacity. The contact angle is the angle between the line connecting the contact points of the ball and raceway in the radial plane and the perpendicular to the bearing axis. High-precision and high-speed bearings typically use a 15 degree contact angle. Under axial force, the contact angle increases.

NILOS bearing features and structure

Common materials for plain bearings include bearing alloys (also known as Babbitt metal or white metal), wear-resistant cast iron, copper-based and aluminum-based alloys, powder metallurgy materials, plastics, rubber, hardwood, and carbon-graphite, polytetrafluoroethylene (Teflon, PTFE), modified polyoxymethylene (POM), etc. Plain bearings absorb and transmit forces between relatively moving parts, maintaining the position and positioning accuracy of the two parts. Additionally, they convert directional motion into rotary motion (such as in reciprocating piston engines). Sliding friction occurs during the operation of plain bearings; the magnitude of sliding friction primarily depends on manufacturing precision, while the friction force of plain bearings primarily depends on the material of the bearing sliding surface. Plain bearing working surfaces generally have self-lubricating functions; plain bearings are classified into non-metallic plain bearings and metallic plain bearings based on material. Non-metallic plain bearings are mainly plastic bearings, which are generally made from high-performance engineering plastics. Professional manufacturers typically possess self-lubricating modification technology for engineering plastics, enhancing them with fibers, special lubricants, glass beads, etc., to achieve specific performance levels, and then processing the modified plastics into self-lubricating plastic bearings via injection molding. In the early twenty-first century, the most commonly used metallic plain bearings were three-layer composite bearings. These bearings generally use carbon steel plates as the substrate, sintering a layer of spherical copper powder onto the steel plate, and then sintering a layer of approximately 0.03mm PTFE lubricant onto the copper powder layer. The intermediate layer of spherical copper powder primarily serves to enhance the bonding strength between the steel plate and PTFE, while also providing certain load-bearing and lubricating functions during operation.

NILOS bearing materials

1) Metallic materials, such as bearing alloys, bronze, aluminum-based alloys, zinc-based alloys, etc. Bearing alloys: Also known as white metal, bearing alloys are primarily composed of tin, lead, antimony, or other metals. Due to their excellent wear resistance, high plasticity, good conformability, good thermal conductivity, good anti-seizing properties, and good oil adsorption, they are suitable for heavy-load and high-speed conditions. However, bearing alloys have low strength and are relatively expensive. During use, they must be cast onto bronze, steel strips, or cast iron bushings to form a thin coating. 2) Porous metallic materials (powder metallurgy materials): Porous metals are powder materials with a porous structure. When immersed in lubricating oil, the micro-pores become filled with oil, transforming them into oil-impregnated bearings with self-lubricating properties. Porous metallic materials have low toughness and are only suitable for smooth, non-impact loads and medium to low speeds. 3) Non-metallic bearing plastics: Common bearing plastics include phenolic plastics, nylon, and polytetrafluoroethylene (PTFE). Plastic bearings offer high compressive strength and wear resistance. They can be lubricated with oil or water and also possess self-lubricating properties, but they have poor thermal conductivity.

NILOS bearing maintenance

During operation, plain bearings generate friction due to contact between the journal and the bearing shell, leading to surface heating, wear, and even "seizure." Therefore, when designing bearings, one should select plain bearing materials with good anti-friction properties for the bearing shell, use suitable lubricants and supply methods, and improve the bearing structure to achieve thick-film lubrication. Shell surface corrosion: Spectral analysis reveals abnormal concentrations of non-ferrous metal elements; many sub-micron wear particles of non-ferrous metal components appear in the spectrum; lubricating oil has excessive water content and acid value. Journal surface corrosion: Spectral analysis reveals abnormal iron element concentrations; many sub-micron iron-component particles appear in the ferrogram; lubricating oil has excessive water content or acid value. Journal surface scoring: The ferrogram contains iron-based cutting wear particles or black oxide particles, and temper colors are present on the metal surface. Shell back fretting wear: Spectral analysis reveals abnormal iron concentrations; many sub-micron iron-component wear particles appear in the ferrogram; lubricating oil water content and acid value are abnormal. Bearing surface scoring: Cutting wear particles are found in the ferrogram, with non-ferrous metal composition. Shell surface spalling: Many large-sized fatigue spalling alloy wear particles and layered wear particles are found in the ferrogram. Bearing burnout: Many large-sized alloy wear particles and black metal oxides are present in the ferrogram. Bearing wear: Due to the metal characteristics of the shaft (high hardness, poor compliance), it is prone to adhesive wear, abrasive wear, fatigue wear, fretting wear, etc. Prevention of paint rust: Paint rust is characterized by a sealed motor that sounds fine initially, but after a period in storage, the motor makes very abnormal noises, and severe rust is found upon removing the bearing. Many manufacturers consider this a pre-bearing issue; the main problem is that insulating varnish releases volatile acids at certain temperatures and humidity, causing corrosion and protection issues with the metal, forming corrosive substances that cause corrosion damage to the plain bearings. Plain bearing life is closely related to manufacturing, assembly, and use; every link must be optimized to ensure the best bearing operation, thereby extending bearing service life. 1) During the production of coated machine bearings, rust prevention and oil seal packaging requirements were not strictly followed for rust prevention treatment of coated machine bearing parts during processing and finished assembled coated machine bearings. For example, rings had excessively long turnover times, and the outer diameter of the outer ring came into contact with corrosive liquids or gases. 2) The quality of anti-rust lubricating oils and cleaning kerosene used in production did not meet the requirements specified by process technology. 3) Due to the continuous price drop of coated machine bearing steel, the quality of the steel gradually declined. For instance, the content of non-metallic impurities in the steel was high (increased sulfur content in steel reduces the material's inherent rust resistance), and there were deviations in the metallographic structure. Currently, the sources of coated machine bearing steel used by manufacturers are varied, and the steel quality is mixed. 4) Poor environmental conditions, high content of harmful substances in the air, and small turnover areas make effective rust prevention difficult. Additionally, hot weather and workers violating rust prevention protocols are not uncommon. 5) Rust-prevention paper, nylon paper (bags), and plastic tubes used for packaging coated machine plain bearings do not meet the requirements for rolling coated machine bearing oil seal rust prevention packaging, which is also a factor causing rust. 6) The turning and grinding allowances for the rings of coated machine plain bearings are too small, and the oxide scale and decarburized layer on the outer diameter were not completely removed, which is also a reason.

Weidou Intelligent Technology professionally sells German NILOS plain bearings, NILOS rolling bearings, NILOS spherical plain bearings, NILOS deep groove ball bearings, NILOS angular contact ball bearings, NILOS self-aligning ball bearings, NILOS thrust ball bearings, NILOS double-direction thrust angular contact ball bearings, NILOS combination bearings, NILOS thrust roller bearings, NILOS needle roller bearings, NILOS insert ball bearings, NILOS self-aligning roller bearings, NILOS flanged bearings, NILOS linear bearings, NILOS original German imports. Welcome inquiries and orders from users.