Deep Groove Ball Bearing
Deep groove ball bearings are the most common type of rolling bearings.
The basic deep groove ball bearing consists of an outer ring, an inner ring, a set of steel balls and a set of cages. There are two types of deep groove ball bearings, single row and double row. The deep groove ball structure is divided into two types: sealed and open. The open type means that the bearing does not have a sealed structure. The sealed deep groove ball is divided into dust-proof and oil-proof. seal. The dust-proof seal cover material is stamped with steel plate, which only serves to prevent dust from entering the bearing raceway. The oil-proof type is a contact oil seal, which can effectively prevent the grease in the bearing from overflowing.
The single row deep groove ball bearing type code is 6, and the double row deep groove ball bearing type code is 4. Its simple structure and convenient use make it the most commonly produced and widely used type of bearing.
Deep groove ball bearings mainly bear radial load, but can also bear radial load and axial load at the same time. When it only bears radial load, the contact angle is zero. When the deep groove ball bearing has a large radial clearance, it has the performance of an angular contact bearing and can bear a large axial load. The friction coefficient of the deep groove ball bearing is very small and the limit speed is also high.
Deep groove ball bearings are the most commonly used rolling bearings. Its structure is simple and easy to use. It is mainly used to bear radial load, but when the radial clearance of the bearing is increased, it has a certain performance of angular contact ball bearing and can bear the combined radial and axial load. When the speed is high and thrust ball bearing is not suitable, it can also be used to bear pure axial load. Compared with other types of bearings with the same specifications and dimensions of deep groove ball bearings, this type of bearing has a small friction coefficient and a high limit speed. However, it is not resistant to impact and is not suitable for heavy loads.
After the deep groove ball bearing is installed on the shaft, the axial displacement of the shaft or the housing can be restricted within the axial clearance of the bearing, so it can be axially positioned in both directions. In addition, this type of bearing also has a certain degree of aligning ability. When it is inclined 2′-10′ with respect to the housing hole, it can still work normally, but it will have a certain impact on the life of the bearing.
Deep groove ball bearings can be used in gearboxes, instruments, motors, household appliances, internal combustion engines, transportation vehicles, agricultural machinery, construction machinery, construction machinery, roller skates, yo-yos, etc.
Deep groove ball bearing installation method 1: press fit: the inner ring of the bearing and the shaft are tightly matched, and the outer ring and the bearing seat hole are loosely matched, the bearing can be press-fitted on the shaft with a press, and then the shaft and the bearing Put them into the bearing seat hole together, and pad an assembly sleeve made of soft metal material (copper or mild steel) on the end face of the bearing inner ring during press-fitting. The outer ring of the bearing is tightly matched with the hole of the bearing seat, and the inner ring and the shaft are When the fit is loose, the bearing can be pressed into the bearing seat hole first. At this time, the outer diameter of the assembly sleeve should be slightly smaller than the diameter of the seat hole. If the bearing ring is tightly fitted with the shaft and the seat hole, install the inner ring and The outer ring should be pressed into the shaft and the seat hole at the same time, and the structure of the assembly sleeve should be able to compress the end faces of the inner ring and the outer ring at the same time.
Deep groove ball bearing installation method two: heating fit: by heating the bearing or bearing seat, using thermal expansion to transform the tight fit into the loose fit. It is a commonly used and labor-saving installation method. This method is suitable for large interference To install the bearing, put the bearing or the separable bearing ring into the oil tank and heat it evenly at 80-100℃, then remove it from the oil and install it on the shaft as soon as possible, in order to prevent the inner ring end face and shaft shoulder from cooling If the fit is not tight, the bearing can be tightened axially after cooling. When the outer ring of the bearing is tightly fitted with the light metal bearing seat, the hot fitting method of heating the bearing seat can be used to avoid scratches on the mating surface. When heating the bearing with an oil tank, there should be a grid at a certain distance from the bottom of the box, or the bearing should be hung with a hook. The bearing cannot be placed on the bottom of the box to prevent sinking impurities from entering the bearing or uneven heating. There must be a thermometer in the oil tank. Strictly control the oil temperature not to exceed 100°C to prevent the occurrence of tempering effects and reduce the hardness of the ferrule.