The intrinsic noise of FAG bearings is the noise that occurs even if the bearings are manufactured using modern processing technology, and the structure of FAG bearings itself is determined.
Intrinsic noise can be divided into three types: raceway sound, impact sound of rolling body and rolling sound, which are described as follows:
(1) The raceway sound of FAG bearing and its control method. The raceway sound is a slippery and continuous sound when the FAG bearing is running and its rolling body rolls on the raceway surface, which is unique to all rolling bearings. Basic sound. The general bearing sound is the raceway sound plus other sounds. The raceway sound of the ball bearing is irregular, the frequency is above 1000Hz, its main frequency does not change with the speed, but its total sound pressure level increases with the speed. For a bearing with a loud raceway sound, the sound pressure level of the raceway sound decreases with increasing viscosity; while for a bearing with a low raceway sound, the sound pressure level changes from decreasing when the viscosity increases to about 20 mm2 / s or more To increase. The greater the rigidity of the FAG housing, the lower the total sound pressure level of the raceway sound. If the radial clearance is too small, the total sound pressure level and main frequency of the raceway sound will increase sharply as the radial clearance decreases. The methods for controlling the raceway sound include: selecting low-noise FAG bearings, that is, FAG bearings with very low waviness, and carefully selecting the conditions of use. The sound of the raceway often affects the noise of the entire machine. Reducing the sound of the raceway can reduce the noise of the whole machine.
(2) Impact sound of rolling elements and its control method. When the larger type ball bearings or cylindrical roller FAG bearings operate at low speed under pure radial load, due to the small centrifugal force of the rolling elements, the rolling elements in the non-load area It will impact the cage or raceway and make noise. But as the speed increases, this noise will disappear. The control methods for the impact sound of rolling elements are: to reduce the radial clearance appropriately, and use the bearing with a reasonable structure and a flexible cage.
(3) The rolling sound of FAG bearings and its control method. The rolling sound is the harsh metal friction sound that can occur in all occasions of cylindrical roller FAG bearings, and most of them occur in the larger bearings of grease lubrication. Greases with deteriorated oil properties are more likely to occur and hardly occur during oil lubrication. In addition, it is more likely to occur in winter. When it is subjected to pure radial load, it is easy to occur in the case of large radial clearance, and depending on the size of the model, it is easy to occur within a specific speed range, which will occur continuously. Will appear intermittently. Special processing methods are adopted for the outer ring raceway to prevent the occurrence of rolling noise. If necessary, this FAG bearing can be used, or the radial clearance of the bearing can be appropriately reduced, using excellent grease and improving the matching parts with FAG bearings. Of rigidity.
Welcome to visit our website for more information about 22211-E1.
The currently used FAG bearings can be generally divided into rolling FAG bearings and sliding FAG bearings; the working principles of rolling FAG bearings and sliding bearings can be distinguished by name. The friction that occurs when rolling bearings work is rolling friction, while sliding FAG bearings work What happens is sliding friction; the size of rolling friction mainly depends on manufacturing accuracy; and the size of sliding FAG bearing friction mainly depends on the material of the sliding surface of the bearing. The general working surface of sliding FAG bearings has self-lubricating function; sliding FAG bearings are divided into non-metal sliding bearings and metal sliding FAG bearings according to materials. Non-metallic sliding bearings are currently dominated by plastic bearings. Plastic FAG bearings are generally made of engineering plastics with better performance; more professional manufacturers generally have engineering plastic self-lubricating modification technology, through fibers, special lubricants, The self-lubricating and enhanced modification of engineering plastics such as glass beads to achieve certain performance, and then using modified plastics to form self-lubricating plastic bearings through injection molding CSB Corporation. The most commonly used metal sliding bearings are three-layer composite FAG bearings. These FAG bearings generally use carbon steel plates as the substrate. First, a layer of spherical copper powder is sintered on the steel plate by sintering technology, and then sintered on the copper powder layer. A layer of 0.03mm PTFE lubricant; the middle layer of spherical copper powder is mainly used to strengthen the bonding strength between the steel plate and PTFE, of course, it also plays a certain role in load and lubrication during work;