What is the difference between cylindrical bearings and needle bearings?

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, the inner diameter size and load capacity are the same as other types of bearings The smallest outer diameter is especially suitable for support results with limited radial mounting dimensions. Depending on the application, bearings or needle roller and cage assemblies without inner ring can be used. The journal surface and the housing hole surface that match the bearing directly serve as the inner and outer rolling surfaces of the bearing to ensure load capacity and running performance. As with ferrule bearings, the hardness of the raceway surface of the shaft or housing bore, the machining accuracy and surface quality should be similar to the raceway of the bearing ring. This type of bearing can only withstand radial loads.

First, from the shape point of view, there are two different criteria for the difference between the needle roller and the roller: the first is the ratio of 2.5 is the boundary point. The second standard is based on a ratio of 4.

Second, from the perspective of force, the needle roller does not bear axial force at all (the end face of the needle roller is not ground, if it is in contact with the shoulder, the friction is very large), and the roller, if the raceway has a shoulder If you can withstand a certain axial force, of course not too big, the principle is not more than 1/10 of the radial force.

Third, from the application point of view, needle roller is mainly used in places where space is limited, so it is widely used in automobiles, motorcycles and textile machines. Moreover, the inner ring of the needle roller is optional. To put it bluntly, if the hardness and roughness of the shaft meet the requirements, the inner ring may not be matched (the space is inherently limited), but if the machining degree of the shaft is relatively low, or relatively soft, An inner ring is also required as a raceway. Rollers are often used to support the floating end of the shaft to absorb the amount of expansion of the shaft. The four rows of rollers on the machine are used more, mainly because the roller has a very large bearing capacity.

The above is a small series for everyone to analyze the general difference between these two types of products, users must be aware of the role and use of their products at the same time!
For more products, please visit: http://www.supplyforever.com/

What is the difference between cylindrical bearings and needle bearings?

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, the inner diameter size and load capacity are the same as other types of bearings The smallest outer diameter is especially suitable for support results with limited radial mounting dimensions. Depending on the application, bearings or needle roller and cage assemblies without inner ring can be used. The journal surface and the housing hole surface that match the bearing directly serve as the inner and outer rolling surfaces of the bearing to ensure load capacity and running performance. As with ferrule bearings, the hardness of the raceway surface of the shaft or housing bore, the machining accuracy and surface quality should be similar to the raceway of the bearing ring. This type of bearing can only withstand radial loads.

First, from the shape point of view, there are two different criteria for the difference between the needle roller and the roller: the first is the ratio of 2.5 is the boundary point. The second standard is based on a ratio of 4.

Second, from the perspective of force, the needle roller does not bear axial force at all (the end face of the needle roller is not ground, if it is in contact with the shoulder, the friction is very large), and the roller, if the raceway has a shoulder If you can withstand a certain axial force, of course not too big, the principle is not more than 1/10 of the radial force.

Third, from the application point of view, needle roller is mainly used in places where space is limited, so it is widely used in automobiles, motorcycles and textile machines. Moreover, the inner ring of the needle roller is optional. To put it bluntly, if the hardness and roughness of the shaft meet the requirements, the inner ring may not be matched (the space is inherently limited), but if the machining degree of the shaft is relatively low, or relatively soft, An inner ring is also required as a raceway. Rollers are often used to support the floating end of the shaft to absorb the amount of expansion of the shaft. The four rows of rollers on the machine are used more, mainly because the roller has a very large bearing capacity.

The above is a small series for everyone to analyze the general difference between these two types of products, users must be aware of the role and use of their products at the same time!
For more products, please visit: http://www.bearingkingdom.com

How to grasp the best time for bearing oil change

Affirmative answers are not acceptable as to whether the grease can be used indefinitely. Because of the excessive use of grease, it is a lot of damage to the bearing.

Grease has a good effect on the bearing. It has good adhesion, wear resistance, temperature resistance, rust resistance and lubricity. It can improve high temperature oxidation resistance, delay aging, dissolve carbon deposits and prevent metal abrasion. Condensation with oil to improve the wear resistance, pressure resistance and corrosion resistance of the machine.

However, the more the grease is filled, the greater the friction torque. With the same filling amount, the friction torque of the sealed bearing is larger than that of the open bearing. After the grease filling amount is equivalent to 60% of the internal space of the bearing, the friction torque is no longer significantly increased. This is because most of the grease in the open bearing has been extruded, and the grease in the sealed bearing has also been lost.

As the filling amount of the grease increases, the temperature rise of the bearing increases linearly, and the same filling amount, the temperature rise of the sealed bearing is higher than that of the open bearing. It is generally believed that the grease filling capacity of sealed rolling bearings should not exceed 50% of the internal space.

In general, the lubrication plan for bearings is based on time. Equipment suppliers typically develop lubrication plans based on operating time. Bearing Master WeChat: 2966884113 and equipment suppliers often add guidance on the amount of lubricant during their maintenance planning. For the staff, short-term lubricant replacement is very common, and often more grease is added.

For lubricated bearings, there is a fixed concept of prevention that keeps the equipment operating properly without the bearings being shut down due to drying and collapse. However, we have to balance the need to maintain lubrication and hunger and a lot of over-lubrication. If the oil change is too small, the bearing will be scrapped in advance; if the oil is changed too much, the bearing will be in trouble or damage the power coil and coiling wire for a long time.
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Analysis of bearing accuracy grade

The accuracy is increased from the 0th level, and is sufficient for the general purpose 0 level, but when used for special conditions or occasions, it requires 5 levels or higher.

Although the above accuracy level is based on the ISO standard, its name is different in national standards.

Dimensional accuracy (items related to shaft and housing installation)

1. Allowable deviation of inner diameter, outer diameter, width and assembly width

2. Allowable deviation of the diameter of the compound circle and the diameter of the outer complex circle in the roller group

3, the allowable limit value of the chamfer size

4, the allowable variation of the width

Rotation accuracy (items related to the rotation of the rotating body)

1. Allowable radial runout and axial runout of the inner and outer rings

2, the inner ring allows lateral runout

3. Allowable variation of the inclination of the outer diameter surface

4. Allowable variation of the thickness of the thrust bearing raceway

5. Allowable deviation and allowable variation of tapered bore
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