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Deep groove ball bearings and double row deep groove ball bearings

Deep groove ball bearings are a more common type in rolling bearings. The basic deep groove ball bearing has an outer ring, an inner ring, a set of steel balls and a set of cages.

Deep groove ball bearings are mainly used to support pure radial loads, and can also support radial and axial loads at the same time. When it is only subjected to pure radial loads, the contact angle is zero. When a deep groove ball bearing has a large radial clearance, that is, it has the performance of an angular contact bearing, it can bear a large axial load. Deep groove ball bearings have small friction coefficients and high limiting speeds. Especially under high-speed operating conditions with large axial loads, deep groove ball bearings are superior to thrust ball bearings.

Deep groove ball bearings have a simple structure and are easy to achieve higher manufacturing accuracy compared to other types, so they are convenient for mass production in series, the manufacturing cost is low, and the use is extremely common. In addition to the basic type, deep groove ball bearings also have various modified structures, such as: deep groove ball bearings with dust cover; deep groove ball bearings with rubber seals; deep groove ball bearings with retaining grooves; Deep groove ball bearing with large load capacity of ball notch; double row deep groove ball bearing.

 1.Deep groove ball bearings with dust cover

 Standard deep groove ball bearings with dust cover are Z type and 2Z type, one with a dust cover on one side is a Z type, and one with a dust cover on both sides is a 2Z type.

 The bearing with dust cover is used in the condition that it is difficult to lubricate alone, and it is inconvenient to set up the lubricating oil path and inspection. The bearing has been filled with a predetermined amount of rust-proof and lubricating lithium-based grease in the manufacturer. The amount of grease injected into each bearing is usually 1/4 to 1/3 of the effective space in the bearing, and the amount of grease can be increased or decreased according to user requirements. The injected grease can usually ensure that the bearing runs at -40 ~ + 120 . If users have higher requirements for bearings, they can also be filled with other properties and grades of grease according to the situation. Bearings with dust caps can work effectively for a long time after being greased, without adding grease during use.

2.Deep groove ball bearings with sealing rings

The performance, grease and use of bearings with sealing rings are basically the same as bearings with dust caps. The difference is that there is a large gap between the dust cover and the inner ring of the bearing with a dust cover, and the gap between the seal lip and the inner ring of the non-contact seal ring bearing is very small. There is no gap between the inner rings and the sealing effect is good, but the friction has increased.

Where low noise is required, the smaller deep groove ball bearings of the 60 and 62 series are often used. Regardless of open bearings, bearings with dust cover or seals, low noise and low vibration requirements can be put forward when ordering. In China's JB (Mechanical Industry Standard), the low, medium and high frequency vibration allowable values for the vibration levels of V1, V2, and V3 are specified. SKF can also provide ultra-low noise bearings, which are marked with the post code QE5.

3.Deep groove ball bearings with retaining grooves and retaining rings

Standard deep groove ball bearings with retaining grooves are coded N at the rear, bearings with retaining grooves and retaining rings are coded NR, and there are also structural variations such as ZN and ZNR.

In addition to bearings with retaining grooves and retaining rings, deep groove ball bearings can withstand the radial load, retaining rings can limit the axial displacement of the bearing, simplify the axial structure of the bearing seat and reduce the axial size.

4.Deep groove ball bearing with ball gap

Standard deep groove ball bearings with ball gaps have two diameter series, 200 and 300. This type of bearing has gaps in the inner and outer rings on one side of the bearing, so that more balls can be loaded through this port, making the bearing's radial load capacity greater than that of a standard deep groove ball bearing. However, the axial bearing capacity is small and cannot run at high speed. If there is a large axial load, it usually needs to be used with a set of ordinary deep groove ball bearings.

5.Double-row deep groove ball bearings

Standard double row deep groove ball bearings are 4200A and 4300A. A-type bearings have no ball gaps. Two reinforced nylon cages are inserted from each side of the bearing. Double-row deep groove ball bearings have a radial load capacity of 1.62 times higher than single-row deep groove ball bearings, and can also bear axial loads.



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