The raceway sound of Timken bearing and its control method raceway sound is a smooth and continuous sound made by the rolling body rolling on the raceway surface when the outer spherical bearing is running. It is a unique basic sound that will occur in all bearings.
The general bearing sound is the sound of raceway plus other sounds. The raceway sound of ball bearing is irregular, and its frequency is above 1000Hz. Its main frequency does not change with the speed, but its total sound pressure level increases with the speed. For the bearing with loud raceway sound, the sound pressure level of raceway sound decreases with the increase of viscosity; Tips for Correctly Using Timken Outer Spherical Bearing to Reduce Noise
The sound pressure level of Timken bearing with low raceway noise changes from decrease to increase when the viscosity increases to more than 20mm2 / s. The greater the rigidity of the bearing pedestal, the lower the total sound pressure level of the raceway sound.
If the radial clearance is too small, the total sound pressure level and dominant frequency of raceway sound will increase sharply with the decrease of radial clearance. The methods to control the sound of raceway are: select the low-noise outer spherical bearing, that is, the bearing with small waviness, and carefully select the service conditions. Raceway noise often affects the noise of the whole machinery. Reducing raceway noise can reduce the noise of the whole machinery.
Tips for Correctly Using Timken Outer Spherical Bearing to Reduce Noise
1. Disassembly and assembly of bearing
The outer spherical bearing shall be cleaned before installation. During installation, special tools shall be used to press the auxiliary bearing straight and evenly. Do not knock with a hand hammer. In particular, it is forbidden to knock directly on the bearing.Tips for Correctly Using Timken Outer Spherical Bearing to Reduce Noise
There are two types of lubricants commonly used for bearings: mken grease and Tien grease. When the circumferential speed of the shaft is less than 4-5m / s, or the parts on the vehicle that cannot be lubricated with lubricating oil, they shall be lubricated with grease.
Two problems should be paid attention to when using grease. One is to select the appropriate brand of grease according to the requirements of the automobile manual. Special attention should be paid to Timken bearings, which should advocate “empty hub lubrication”, that is, only apply an appropriate layer of grease on the outer spherical bearing, otherwise, it will not only waste and poor heat dissipation, but also make the grease overflow due to heating, which may affect the braking performance.Tips for Correctly Using Timken Outer Spherical Bearing to Reduce Noise
The brand of lubricating oil shall be selected according to the requirements of the vehicle manual, and shall be replaced in time after the vehicle maintenance cycle. After discharging the old oil, the mechanism shall be cleaned and then added with new oil. The oil shall be added to the specified marking line or flush with the oil filler, and no more oil shall be added.Tips for Correctly Using Timken Outer Spherical Bearing to Reduce Noise
Rolling sound of Timken bearing and its control method rolling sound is a harsh metal friction sound that may occur in all occasions of outer spherical bearing. It mostly occurs in larger types of grease lubricated bearings, but it is more likely to occur in greases with degraded base oil performance, which hardly occurs in oil lubrication. In addition, it is easy to occur in winter.
When bearing pure radial load, it is easy to occur in the case of large radial clearance, and it is easy to occur in a specific speed range with different models and sizes, both continuously and intermittently. Taking special processing methods for the outer race raceway can prevent the occurrence of rolling sound.
If necessary, this kind of bearing can be selected, or the radial clearance of Timken bearing can be appropriately reduced, the lubricating grease with excellent performance can be used and the rigidity of parts matched with outer spherical bearing can be improved.Tips for Correctly Using Timken Outer Spherical Bearing to Reduce Noise