Deep groove ball bearing (GB/T 276-2003), formerly known as single row radial ball bearing, is the most widely used type of rolling bearing. Its characteristics are low frictional resistance, high rotational speed, and can be used for bearing radial loads or combined radial and axial loads, as well as for bearing axial loads, such as low-power electric motors, car and tractor gearboxes, machine tool gearboxes, general machines, tools, etc.

Basic parameters

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 retaining structure. There are two types of deep groove ball bearings: single row and double row. The deep groove ball structure is also divided into sealed and open structures. Open type refers to the bearing without a sealing structure, and sealed deep groove ball is divided into dustproof seal and oil-proof seal. The dustproof sealing cover material is made of steel plate stamping, which only serves to prevent dust from entering the bearing raceway. The oil proof type is a contact type oil seal, which can effectively prevent the leakage of lubricating grease inside the bearing.

The type code for single row deep groove ball bearings is 6, and the code for double row deep groove ball bearings is 4. Its simple structure and convenient use make it the most widely produced and widely used type of bearing.

Working principle

Deep groove ball bearings mainly bear radial loads and can also bear both radial and axial loads. When it only bears radial load, the contact angle is zero. When deep groove ball bearings have large radial clearance, they have the performance of angular contact bearings and can withstand large axial loads. The friction coefficient of deep groove ball bearings is very small, and the limit speed is also very high.

Bearing characteristics

Deep groove ball bearings are the most commonly used rolling bearings. Its structure is simple and easy to use. Mainly used to withstand radial loads, but when the radial clearance of the bearing is increased, it has certain performance of angular contact ball bearings and can withstand combined radial and axial loads. When the rotational speed is high and thrust ball bearings are not suitable, they can also be used to withstand pure axial loads. Compared with other types of bearings with the same specifications and dimensions as deep groove ball bearings, this type of bearing has a small friction coefficient and a high limit speed. But it is not resistant to impact and is not suitable for bearing heavy loads.

After installing the deep groove ball bearing on the shaft, it can limit the axial displacement in both directions of the shaft or shell within the axial clearance range of the bearing, thus enabling axial positioning in both directions. In addition, this type of bearing also has a certain degree of centering ability. When tilted 2 'to 10' relative to the casing hole, it can still work normally, but it has a certain impact on the bearing life.

Bearing Applications

Deep groove ball bearings can be used for gearboxes, instruments, motors, household appliances, internal combustion engines, transportation vehicles, agricultural machinery, construction machinery, engineering machinery, roller skates, yo-yo balls, etc.

Note

Deep groove ball bearings can cause sliding between the ball and the raceway when the bearing load is too small during operation, which can become the cause of scratches. Especially large deep groove ball bearings with large ball and cage weights have this tendency. In many cases, bearings may rust, and there are many reasons for bearing corrosion. The most common factors in our daily life are the following:

1) Due to poor sealing device, it is invaded by moisture, dirt, etc;

2) The bearings have been unused for a long time, exceeding the rust prevention period and lacking maintenance.

3) The surface roughness of the metal is relatively high;

4) Contact with corrosive chemical media, poor cleaning of bearings, surface contamination with dirt, or contact with bearings with sweaty hands, failure to package or install bearings in a timely manner after cleaning, long-term exposure to air, invasion and contamination by air moisture;

5) Environmental temperature and humidity, and exposure to various environmental media; The rust inhibitor fails or the quality does not meet the requirements.