Product Description
Here is the product details of needle bearings:
Structure and Composition
- Needle bearings are roller bearings with cylindrical rollers. The rollers are thin and long, with a diameter D\leq5mm and a length - to - diameter ratio L/D\geq2.5. They consist of components such as outer rings, inner rings (some types may not have inner rings), rollers, and cages.
Types
- Pressed - on outer ring type: It has a thin - walled pressed - on outer ring, a relatively low cross - section height, and a high load - carrying capacity. It is mainly used in bearing configurations where the inner hole of the bearing housing cannot be used as the raceway for the needle roller cage assembly.
- Solid - ring type: It is composed of one or two rings and a set of needle rollers with a cage. According to different application scenarios, it can be divided into bearings with or without inner rings. It has a small volume and a high load - carrying capacity.
- Combination type: It is a bearing unit combined by a radial needle roller bearing and a thrust bearing component. It has a compact structure, a small size, a high rotation accuracy, and can bear a certain axial load while bearing a high radial load.
- Thrust type: It consists of a thrust cage assembly with needle rollers or cylindrical rollers or balls and thrust washers. The needle rollers and cylindrical rollers are held and guided by the thrust cage.
Characteristics
- Compact radial structure: When the inner diameter size and load - carrying capacity are the same as those of other types of bearings, the outer diameter is the smallest, which is especially suitable for support structures with limited radial installation dimensions.
- High load - carrying capacity: Due to the large contact area between the rollers and the raceway, it can bear a large radial load.
- Low friction coefficient: The friction coefficient is small, the transmission efficiency is high, and the energy loss is low.
- Good running accuracy: The internal clearance of the bearing is small, and the processing accuracy of each part is high, which can ensure high - precision operation.
Applications
- Needle bearings are widely use
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