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Types of deep groove ball and related introduction

Edit: Rihoo Industry (Hongkong) Co.,Limited    Date: Oct 29, 2018

1. Deep groove ball bearing with dust cover


The standard deep groove ball bearings with dust cover are Z type and 2Z type, Z type with dust cover on one side and 2Z type with dust cover on both sides.


The bearing with dust cover is used in the condition that it is difficult to separate lubrication, the lubricating oil road is installed and the inspection condition is inconvenient. The bearing has been filled with the quantitative and fixed grade of anti-rust 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 usually ensures that the bearing operates at -40 to +120 °C. If the user has higher requirements for the bearing, other properties and grades of grease can be filled according to the situation. Bearings with dust caps can be effectively worked for a long time after grease filling, without the need to add grease during use.


The bearing with dust cover is mostly used for small and medium-sized generators, both ends of the rotor of the motor, automobiles, tractors, air conditioners, fans, etc., as well as occasions where the noise vibration of the bearing is particularly required.


2, deep groove ball bearing with sealing ring


Standard deep groove ball bearings with seals are contact type sealed bearings RS type (one side seal), 2RS type (two side seal) and non-contact type sealed bearings RZ type (one side seal), 2RZ type (two side seal).


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


In the case of low noise requirements, the smaller size deep groove ball bearings of the 60 and 62 series are used. Regardless of open bearings, bearings with dust caps or seals, it is possible to request low noise and low vibration when ordering. In China's JB (Mechanical Industry Standard), the vibration allowable values of the three frequency bands of V1, V2, and V3 are specified. Ultra-low noise bearings are also available from SKF, which are marked with the rear code QE5.


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


The standard type deep groove ball bearing with snap groove, the rear code is N, the bearing with stop groove and the stop ring is coded as NR, in addition to ZN, ZNR and other structural variants.


In addition to the function of the deep groove ball bearing to withstand the radial load, the retaining groove and the bearing with the retaining ring can limit the axial displacement of the bearing, simplify the axial structure of the bearing seat and reduce the axial dimension.


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