Timken outer spherical bearings raceway sound and its control method The raceway sound is the smooth and continuous sound made by the rolling elements rolling on the raceway surface when the outer spherical bearing is running.
Timken outer spherical bearings raceway sound and its control method The raceway sound is the smooth and continuous sound made by the rolling elements rolling on the raceway surface when the outer spherical bearing is running.
It is a unique basic sound that occurs in all directions. The general bearing sound is the raceway sound plus other sounds. The raceway sound of Timken outer spherical bearings is irregular, and its frequency is above 1000Hz.
Its main frequency does not change with speed, but the total sound pressure level increases with speed. For bearings with a loud raceway sound, the sound pressure level of the raceway sound decreases with the increase of viscosity;
The sound pressure level of low raceway noise Timken spherical bearings changes from decreasing to increasing when the viscosity increases above 20mm2/s. The greater the stiffness of the bearing seat, 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 sharply decrease as the radial clearance decreases. Increase.
The way to control the sound of the raceway is to choose low-noise outer spherical bearings, that is, bearings with small waviness, and carefully select the conditions of use. Raceway noise often affects the noise of the entire machine. Reducing the noise of the raceway can reduce the noise of the whole machine.
Tips for Noise Reduction of Timken Outer Spherical Bearings
Disassembly and assembly of bearings; the timken outer spherical bearings should be cleaned before installation. During installation, special tools should be used to flatten and flatten the auxiliary bearing. Do not hit with a hand hammer. In particular, it is strictly forbidden to strike the bearing directly.
There are two types of lubricants commonly used for bearings: mken grease and Tien grease. When the peripheral speed of the shaft is less than 4-5m/s, or the part of the vehicle that cannot be lubricated with lubricating oil, grease lubrication should be used. Two issues should be paid attention to when using grease. One is to choose a suitable brand of grease according to the requirements of the car manual. Special attention should be paid to Timken bearings, and “empty hub lubrication” is advocated, that is, only a layer of appropriate grease is applied on the outer spherical bearing, otherwise it will not only waste heat, but also cause grease to overflow due to heat, which may affect braking. performance.
The brand of lubricating oil should be selected according to the requirements of the vehicle instruction manual and replaced in time after the vehicle maintenance cycle. After draining the old oil, clean the mechanism and add new oil. The engine oil should be added to the specified marking line or flush with the oil filling port, and no additional oil should be added.
Rolling sound of Timken bearings and its control method: rolling sound is a harsh metal friction sound, which may appear in all occasions of outer spherical bearings. It occurs mostly in larger sizes of grease-lubricated bearings, but is more likely to occur in greases with degraded base oil properties, and hardly ever occurs in oil-lubricated bearings.
In addition, it is easy to occur in winter. When bearing a pure radial load, it is easy to occur when the radial clearance is large, and it is easy to occur in a specific speed range of different models and sizes, and there are continuous and intermittent. The raceway of the outer ring adopts a special treatment method to prevent rolling noise.
This type of bearing can be used if necessary, or the radial clearance of the Timken bearing can be appropriately reduced, and lubricating grease with excellent performance can be selected to improve the rigidity of the matching parts with the outer spherical bearing. Proper use of Timken insert spherical bearings reduces noise.
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