Technology for controlling vibration and noise of automotive bearings
The squeaking sound is the harsh metal friction sound of the outer spherical bearing that can occur in all occasions. Most of it occurs in the grease-lubricated larger type of bearing, and it is more likely to occur in the grease with deteriorated base oil performance. Does not happen. Chinese bearing research has found that it is more prone to occur in winter. When subjected to pure radial load, it is easy to occur in the case of large radial clearance, and it is easy to occur in a certain speed range depending on the size of the model. It will occur continuously and will appear intermittently.
1. In general, to control the noise impact of the bearing, it is necessary to take countermeasures against the root cause of these noises in order to receive the effect of the root cause.
(1) Select low noise automotive bearings;
(2) Avoid resonance with the host and avoid resonance sensitive speed;
(3) Try to eliminate noise from the application of the bearing;
(4) When other methods are ineffective, take additional measures for sound insulation and noise reduction.
2, the correct use of bearings to reduce noise tips:
Bearing use factors mainly refer to whether the installation adjustment, use and maintenance, maintenance and repair, etc. meet the technical requirements. According to the technical requirements for the installation, use, maintenance and maintenance of automobile bearings, monitor and check the load, speed, working temperature, vibration, noise and lubrication conditions of the bearing in operation, find out the cause and immediately adjust the cause, and make adjustments. It returned to normal. The installation condition is one of the primary factors in the use factor. The bearing condition of the whole bearing is changed due to the improper installation.
(1) Reasons for noise from bearings:
The rolling sound of the bearing and its control method The rolling sound is a slippery continuous sound that the rolling element rolls on the rolling surface when the outer spherical bearing is running, which is the unique basic sound that all bearings will produce. The general bearing sound is the rolling sound plus other sounds.
The ball bearing's raceway sound 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 increase of the speed. For bearings with large rolling sounds, the sound pressure level of the raceway sound decreases with the increase of viscosity; while for bearings with small raceway sound, the sound pressure level decreases when the viscosity increases to about 20 mm2/s or more. For the increase.
The greater the rigidity of the bearing 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 method for controlling the rolling sound is to select a low-noise outer spherical bearing, that is, a bearing with a small waviness, and carefully select the conditions of use. The raceway sound often affects the noise of the entire machine, and reducing the raceway sound can reduce the noise of the entire machine.
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