Bearings in which cylindrical rollers and raceways are in line contact. Load capacity, mainly bear radial load. The friction between the rolling element and the rib of the ferrule is small, which is suitable for high-speed rotation. According to whether the ring has ribs, there are NU, NJ, NUP, N, NF and other single row bearings, and NNU, NN type double row bearings. The inner ring and outer ring of the bearing can be separated. Cylindrical roller bearings with no ribs on the inner ring or outer ring, the inner ring and outer ring can move relative to the axial direction, so they can be used as free end bearings. A cylindrical roller bearing with double ribs on one side of the inner ring or outer ring, and a single rib on the other side of the ring, which can withstand a certain degree of axial load in one direction. Double-row cylindrical roller bearings have high rigidity against radial loads and are mainly used for machine tool spindles. Generally, steel stamping cages or copper alloy car cages are used. But there are also some polyamide shaped cages. Cylindrical roller bearing rings are divided into the following shapes according to the presence or absence of ribs. NU type, N type, NNU type and NN type are suitable for free side bearings. NJ type and NF type can withstand a certain degree of axial load in one direction, and NH type and NUP type are used as fixed side bearings. NH-type cylindrical roller bearings are assembled from NJ-type cylindrical roller bearings and L-shaped rib rings. When installing NUP type bearings, please install the lettering side of the retaining ring toward the cylindrical roller bearings (stamping cage). EW series products with large load capacity are available. Cylindrical roller bearings (cut cages) are available in the EM series with high load capacity. Cylindrical roller bearings (polyamide molded cage) with polyamide molded cage (ET type), can be used continuously in the temperature range of -40 ~ 120 ℃. However, please consult NSK in advance when using gear oil, non-flammable hydraulic oil, or ester-based synthetic oil at high temperatures above 100°C. Full Complement Cylindrical Roller Bearings The full complement cylindrical roller bearings have no cage and can accommodate the maximum number of rollers, therefore, the load capacity is very large. However, because it is a full complement roller type, it is inferior in high-speed performance compared to bearings with cages. Open type single row and double row bearings are mainly used in low speed and high load fields of general industrial machinery, and dust cover type double row bearings are mainly used in crane steel rope pulleys. Cylindrical roller bearings for pulleys 1. Sealing: Due to the contact seal ring, the effect of preventing the intrusion of foreign matter and water is excellent. 2. Large load capacity: As a pulley bearing, it has a large radial load capacity and thrust load capacity. 3. Corrosion resistance: through phosphate coating treatment, the anti-rust ability is improved. 4. Grease supply type: It is a sealed bearing, and at the same time, grease can be supplied through a grease hole in the inner ring. 5. Reduction of installation parts: With the outer ring retaining ring, the sealing performance is good, so the number of parts around the bearing can be reduced, and the cost of the overall structure of the pulley can be reduced.
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