Needle bearing
The working principle of needle roller bearings is to use the rolling elements to roll between the outer rings, reducing the rolling coefficient and sliding coefficient, thereby reducing efficiency loss and heat generation. The rolling coefficient of needle roller bearings is smaller than the sliding coefficient and therefore has primary and lower difficulty.
1. Strong bearing capacity: Because needle roller bearings use rolling bearings, they have higher bearing capacity than sliding bearings. Needle roller bearings are able to withstand larger bearings and bearings and are suitable for working environments with high speed and high precision loads.
2. High precision: The rolling elements of needle roller bearings use small needle rollers, which reduces the contact area between the inner and outer rings, thus improving the precision of the bearing. Needle roller bearings can achieve higher motion accuracy and positioning accuracy, and are suitable for mechanical equipment and instruments with higher requirements.
3. Save space: Since needle roller bearings use rolling elements, under the same conditions, the size of needle roller bearings is relatively small, which can save installation space. Needle roller bearings are particularly suitable for equipment and machines where space is limited.
4. Good fatigue resistance: When the rolling elements of needle roller bearings roll, the contact area between the needle rollers is small and the friction heat is small, thereby reducing the fatigue damage of the needle rollers. Needle roller bearings can maintain a lifetime of operation under high-speed operation for a long time.
Stamping outer ring needle roller bearing outer ring is with thin steel plate precision stamping molding, and keep frame and the whole group of needle roller composition, stamping outer ring needle roller bearing radial cross-section thickness is very small, and has a large load capacity, especially suitable for the requirements of economy of the large quantity products.
The outer ring of this type of needle roller bearing and the bearing box adopts the interference fit, does not need the axial fixing device. This ensures effective performance even at high speeds and high loads. In addition, due to the large volume of sealing grease, a longer lubrication interval can be ensured. Usually, single-row drawn cup needle roller bearings do not have lubricating oil holes while double-row bearings have lubricating oil holes.
This kind of needle roller bearings generally do not use the inner ring. If you need to use the inner ring, you can choose IR type inner ring.
Drawn cup needle roller bearings are divided into bearing two ends perforated (HK type) and bearing one end closed type (BK type). Compared with the perforated type of stamped outer ring needle roller bearings, the closed end of the sealed type bearing is airtight, which is suitable for shaft ends and can withstand small axial play.
Sealed type drawn cup needle roller bearings
Sealed type drawn cup needle roller bearings are sealed with a sealing ring, which can protect the bearings from intrusion of debris and grease leakage under general working conditions. Therefore, they can be operated for a long time in the range of -20℃-120℃. If you can supplement the appropriate grease or short-term use, can be used for +130 ℃.
The seal is made of synthetic rubber with good lip elasticity and core lined with steel plate, which has strong mechanical rigidity, in addition, the seal plays an axial guiding role for the cage.
Translated with DeepL.com (free version)
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