Deep groove ball bearing is the most common type of rolling bearing. The basic deep groove ball bearing has an outer ring, an inner ring, a set of steel balls and a set of retaining frame. The type code of deep groove ball bearing is 6.
Deep groove ball bearing is mainly used to bear pure radial load, but also can bear radial load and axial load at the same time. When it only bears pure radial load, the contact angle is zero. When the deep groove ball bearing has large radial clearance, it has the performance of angular contact bearing and can bear large axial load. The friction coefficient of deep groove ball bearing is very small, and the limit speed is also very high. Especially in the high-speed operation condition with large axial load, the deep groove ball bearing has more advantages than the thrust ball bearing.
Compared with other types, deep groove ball bearing is easy to achieve higher manufacturing accuracy, so it is easy to produce in series and in large quantities with low manufacturing cost. In addition to the basic type, deep groove ball bearing also has various variant structures, such as: deep groove ball bearing with dust cover; deep groove ball bearing with rubber sealing ring; deep groove ball bearing with stop groove; deep groove ball bearing with large load capacity with ball loading gap; double row deep groove ball bearing.
1. Deep groove ball bearing with dust cover
The standard deep groove ball bearing with dust cover is Z type and 2Z type, one side with dust cover is Z type, two sides with dust cover is 2Z type.
The bearing with dust cover is used in the condition that it is difficult to lubricate alone, to install lubricating oil circuit and to check the condition. The bearing has been filled with fixed quantity and grade of anti rust and lubricating lithium grease in the manufacturer. The amount of grease injected into each bearing is usually 1 / 4 ~ 1 / 3 of the effective space in the bearing, and the amount of grease can be increased or decreased according to the requirements of users. The injected grease can guarantee the bearing to operate under the working condition of - 40 ～ + 120 ℃. If the user has higher requirements for the bearing, it can also be filled with other properties and brands of grease according to the situation. The bearing with dust cover can work effectively for a long time after being greased, and it is not necessary to add grease during use.
Bearings with dust covers are mostly used in small and medium-sized generators, both ends of rotors of motors, automobiles, tractors, air conditioners, fans and other places, as well as occasions with special requirements for noise and vibration of bearings.
2. Deep groove ball bearing with sealing ring
The standard deep groove ball bearing with sealing ring has contact seal bearing RS (one side seal), 2RS (two sides seal), RZ (one side seal) and 2RZ (two sides seal).
The performance, greasing and application of the bearing with sealing ring are basically the same as those with dust cover. The difference is that there is a large gap between the dust cover and the inner ring of the bearing with dust cover, while the gap between the sealing lip and the inner ring of the non-contact seal ring bearing is very small, and there is no gap between the sealing lip and the inner ring of the contact seal ring bearing, so the sealing effect is good, but the friction is increased.
In case of low noise requirement, 60 and 62 series deep groove ball bearings with smaller size are used. No matter open bearing, bearing with dust cover or bearing with sealing ring, the requirements of low noise and low vibration can be put forward when ordering. The allowable vibration values of low, medium and high frequency bands of V1, V2 and V3 are specified in JB (mechanical industry standard).
3. Deep groove ball bearing with stop groove and with stop ring
The standard deep groove ball bearing with stop groove is n, and the bearing with stop groove and stop ring is named Nr. in addition, there are structural variants such as Zn and ZNR.
The bearing with stop groove and stop ring not only has the function that deep groove ball bearing can bear radial load, but also can limit the axial displacement of bearing, simplify the axial structure of bearing seat and reduce the axial size.
The bearing with stop groove and stop ring is mostly used in automobile, tractor and other working parts with small axial load.