Imported bearings are usually produced in an informal production environment, so the manufacturing process of the product itself must be very bad, which can be identified from the manufacturing process of the bearing product. Secondly, whether the bearing products are fake or inferior products can be seen in the outer packaging products used by the bearing products. Carefully observe whether the manufacturer's label on the bearing is up to the standard; and then pay attention to the problem of the bearing products in the sales channel. If you buy bearing products from other manufacturers, you will rarely buy fake and inferior bearing products, but if you buy from hardware markets and other places, you are likely to buy fake and inferior bearing products; then pay attention to observe whether the manufacturer's bearing technology is Mature, immature technology, the requirements on the precision of the bearing must be substandard. Needle roller bearing products cannot win the market by reducing costs. In this case, inferior bearing raw materials are usually used for production, while regular needle roller bearing products are made of high-quality bearing raw materials. Only in this way can the bearing quality be guaranteed. service life. The drawn cup needle roller bearings mounted on the shaft end are of double-sided open type and single-sided closed type. The base end face of the closed drawn outer ring can bear little axial guiding force. Full-roller bearings without an outer ring generally do not have an inner ring. Where the journal cannot be hardened and ground, the inner rings listed in the table may be used. The hardened steel outer ring and the needle roller cage assembly of the full complement bearing without outer ring are inseparable. Free space for lubricant storage allows extended relubrication intervals. Bearings generally use a single-row design. Except for the wider bearing series 1522, 1622, 2030, 2538 and 3038, which are equipped with two needle roller cage assemblies. There are lubricating oil holes in the outer ring of the bearing. According to user needs, all single row drawn full roller bearings without outer ring with shaft diameter greater than or equal to 7mm can be equipped with an outer ring with lubricating oil hole (code suffix AS1). Needle roller bearings are equipped with thin and long rollers (the length of the rollers is 3 to 10 times the diameter, and the diameter is generally not more than 5mm), so the radial structure is compact, and its inner diameter and load capacity are the same as other types of bearings. Smaller diameter, especially suitable for bearing results with limited radial installation size. According to different applications, bearings without inner rings or needle roller and cage assemblies can be selected. Directly used as the inner and outer rolling surfaces of the bearing, in order to ensure the same load capacity and running performance as the bearing with ring, the hardness, machining accuracy and surface quality of the raceway surface of the shaft or housing hole should be similar to the raceway of the bearing ring.
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