Yantai Bonway Manufacturer

Fanauina nila

Needle bearings are roller bearings with cylindrical rollers, which are thin and long relative to their diameter. This kind of roller is called a needle roller. Despite having a small cross-section, the bearing still has a high load bearing capacity, needle roller bearings are equipped with thin and long rollers (roller diameter D≤5mm, L/D≥2.5, L is the roller length), so The radial structure is compact, and its inner diameter and load capacity are the same as other types of bearings, and the outer diameter is the smallest. It is especially suitable for supporting structures with restricted radial installation dimensions.
According to different applications, bearings without inner ring or needle roller and cage components can be selected. At this time, the journal surface and shell hole surface matching the bearing directly serve as the inner and outer rolling surfaces of the bearing to ensure load capacity and running performance Same 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. This kind of bearing can only bear radial load.

Ituaiga o:
In addition to those listed in the catalog, bearings that can be used in general engineering, such as: open drawn cup needle roller bearings (1), closed drawn cup needle roller bearings (2), inner ring needle roller bearings (3) and without Inner ring needle roller bearings/Needle roller bearings without inner ring and cage (4), with and without cage filled with needle roller bearings (5) SKF can also supply various types of needle roller bearings, 1. Needle roller Cage assembly 2. Needle roller bearing without ribs 3, self-aligning 4, combined needle roller/ball bearing 5, combined needle roller/thrust ball bearing 6, combined needle roller/cylindrical roller thrust bearing.

Stamping outer ring:
Drawn cup needle roller bearings are needle roller bearings with thin stamped and formed outer rings. Its main feature is that the section height is very low and the load bearing capacity is high. It is mainly used for the bearing arrangement with compact structure, low price and the inner hole of the bearing box cannot be used as the raceway of the needle roller cage assembly. The bearing and the bearing housing must be installed in an interference fit. If the axial positioning functions such as the box shoulder and the stop ring can be omitted, the inner hole of the bearing box can be made extremely simple and economical. The drawn cup needle roller bearings mounted on the shaft end have 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. Drawn cup needle roller bearings generally do not have an inner ring. When the journal cannot be hardened and ground, the inner ring listed in the table can be used. The outer ring of hardened steel plate and the needle roller cage assembly of the drawn cup needle roller bearing cannot be separated.

The free space for storing lubricant can extend the relubrication interval. Bearings generally adopt a single row design. But the wider specifications of bearings 1522, 1622, 2030, 2538 and 3038 series are excluded, which are equipped with two needle roller cage assemblies. The outer ring of the bearing has lubrication holes. According to user needs, all single row drawn cup needle roller bearings with shaft diameters greater than or equal to 7mm can be equipped with outer rings with lubricating holes (code suffix AS1). Drawn cup needle roller bearings with oil seals, where oil seals cannot be installed due to space constraints, can provide drawn cup needle roller bearings with oil seals at open or closed ends (3 to 5). This type of bearing is equipped with a friction oil seal of polyurethane or synthetic rubber, which is filled with lithium-based grease with good anti-rust performance, and is suitable for operating temperatures from -20 to +100°C. The inner ring of the oil-sealed bearing is 1mm wider than the outer ring. This allows the bearing to ensure that the oil seal works well and avoids contamination of the bearing even when the shaft is slightly displaced relative to the bearing housing. The inner ring of the bearing also has lubrication holes, which can be supplemented by the outer ring or the inner ring according to the needs of the bearing configuration.

Physical ferrule:
Entity ferrule needle roller bearings are composed of one or two ferrules and a needle roller set with a cage. According to different applications, it can be divided into bearings with inner ring or without inner ring. Therefore, the solid ferrule needle roller bearing can meet the requirements of light weight, small space occupation and high transmission power. Solid ferrule needle roller bearings have a smaller volume and higher load capacity. Structure type outer ring double ribs (or double lock ring) needle roller bearings with cage NA, NAV, NKI can be installed with inner ring and outer ring (with lock ring, a full set of needle rollers and cage), with high authority speed, There are two types: single row and double row. If the shaft cannot be used as a raceway, that is, if it is impossible or uneconomical to harden the shaft by grinding, this type of needle bearing with an inner ring can be used.
Features NA and NKI type bearings without inner ring are RNA and NK type needle roller bearings. This kind of bearing has no inner ring and is suitable for supporting structures with restricted radial installation dimensions. The journal matched with the bearing is directly used as the rolling surface. As the shaft of the raceway surface, the hardware must be hardened and ground, and only when it is processed to the appropriate size and shape accuracy, the complete set of needle roller bearings can have a higher life and operating accuracy. At the same time, because there is no inner ring, the diameter of the shaft can also be appropriately enlarged, which also increases the rigidity.

Combination type:
The combined needle roller bearing is a bearing unit composed of radial needle roller bearings and thrust bearing components. It has a compact structure and small volume, high rotation accuracy, and can bear a certain axial load while bearing a high radial load. And the product structure is diverse, wide adaptable and easy to install. Combined needle roller bearings are widely used in machine tools, metallurgical machinery, textile machinery and printing machinery and other mechanical equipment, and can make the mechanical system design very compact and smart.

Thrust type:
The thrust bearing consists of a thrust cage assembly with needle rollers or cylindrical rollers or balls and a thrust washer. Needle rollers and cylindrical rollers are held and guided by the thrust cage. When used with different series of DF thrust bearing washers, many different combinations can be provided for the bearing configuration. Due to the selection of high-precision cylindrical rollers (needle rollers) to increase the contact length, the bearing can obtain high load capacity and high rigidity in a small space. Another advantage is that if the surface of the adjacent parts is suitable for the raceway surface, the washer can be omitted, which can make the design compact. The cylindrical surface of the needle roller and the cylindrical roller used in the DF thrust needle roller bearing and thrust cylindrical roller bearing is The modified surface can reduce edge stress and increase service life.

faapipiiina:
The installation of full complement needle roller bearings is usually carried out using auxiliary sleeves. At this time, the auxiliary roller or auxiliary sleeve supports the needle roller to prevent it from falling out, and the journal lifts the needle roller with its own chamfer. As the needle bearing moves slowly inward on the journal, the auxiliary roller Or the auxiliary sleeve will slowly withdraw until it is installed in the working position. The outer diameter of the auxiliary roller and auxiliary sleeve should be 0.1-0.3mm smaller than the shaft diameter. When installing, first coat the inner surface of the bearing outer ring with grease, stick the needle roller against the inner surface (there should be a gap when inserting the last needle), and then put the auxiliary roller instead of the journal or bearing inner ring Or push the auxiliary sleeve into the outer ring hole, and align the end face with the end face of the mounting shaft or the end face of the inner ring of the bearing that has been installed on the shaft, and then use a press or a hand hammer to apply pressure. Needle roller bearings can also be installed in this way, that is, apply a thin layer of lubricating oil to the outer diameter of the auxiliary sleeve and insert it into the outer ring of the bearing so that the auxiliary sleeve and the outer ring of the bearing form an annular hole, and then install needle rollers in the annular hole. After installing the needle roller, use the working shaft to push out the auxiliary sleeve. For needle roller bearings without inner ring or outer ring, during installation, first apply a thin layer of grease to the rolling surface of the shaft or housing hole, and place the needles on the grease at the installation site in turn. There should be a gap when placing the last needle. The gap should be 0.5mm on the circumference of the needle bearing. It is not possible to hard squeeze the last needle in, or to install one less needle, because the bearing will be stuck and unable to rotate during hard squeezing; when there is less installation, the gap is too large, which will easily cause needle rolling when the bearing is running Twisting and breaking. For needle roller bearings with a stamped outer ring, because the outer ring wall is very thin, the non-needle roller bearings must be installed by hammering, and should be pressed in with a press. Because the pressure is uneven when the hand hammer is hit, it is easy to cause local deformation of the outer ring of the needle roller bearing.

lelei:
Needle roller bearings are equipped with thin and long rollers (the roller length is 3-10 times the diameter, and the diameter is generally not greater than 5mm), so the radial structure is compact, and its inner diameter and load capacity are the same as other types of bearings. The smallest diameter, especially suitable for supporting structures with limited radial installation dimensions. Needle roller bearings are used in different applications, and the machining accuracy and surface quality should be combined with the bearing ring and purpose. The needle roller bearing is a bearing unit composed of radial needle roller bearings and thrust bearing components.

Lapataiga:
Needle roller bearings have large load-bearing capacity and are suitable for supporting structures with restricted installation dimensions. The journal surface is hardened as the rolling surface. The bearing is fitted into the seat hole with a press fit, eliminating the need for axial positioning. Bearings should be filled with a proper amount of grease before installation. Normally, they do not need to be lubricated after assembly. BK type bearings are used in the support of journals without extension ends. The end faces are closed for sealing and can withstand small axial movement.

Reason for damage:
Generally speaking, 33.3% of needle roller bearing damages are due to fatigue damage, 33.3% of needle roller bearings are due to poor lubrication, and 33.3% are due to contaminants entering the bearing or improper equipment disposal.
Dust cleans the bearing and the surrounding environment. The fine dust invisible to the naked eye is a powerful killer of the bearing, which can increase the wear, vibration and noise of the bearing. Stamping forms strong stamping when using equipment, which is very likely to cause damage to the needle bearing or directly hit the bearing with a hammer, and transfer pressure through the rolling body. The impact of the installation of non-professional tools Use suitable and accurate equipment, you can try to avoid the use of cloth and short fibers. Needle roller bearings can be clearly seen in laboratory tests or in practical applications. Needle roller bearings with the same appearance under the same operating conditions have a very different life.