Influence of bearing layout on oscillation and noise

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Influence of bearing layout on oscillation and noise

Source: China Bearing Network Time: 2018-01-22
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1. The sound of the rolling track is due to the fact that the rolling element rolls over the raceway when the bearing rotates, and it announces a smooth and continuous noise; as long as its sound pressure level or cavity is extremely large, it leads to everyone's attention. In fact, the rolling track sounds The stimulating sound energy is limited; as in normal conditions; the quality of the 6203 bearing raceway sound is 25 to 27 dB. This noise is most typical for single row deep groove ball bearings that accept radial loads; it has the following features: a. Noise and oscillation are random, b. The oscillation frequency is above 1 kHz, c. No matter how the speed changes, the main frequency of the noise is almost constant and the sound pressure level is improved with the addition of the speed, d. When the radial clearance increases; the sound pressure level is sharply added, e. The rigidity of the bearing housing increases; the lower the total sound pressure level; even if the speed increases, the total sound pressure level is not added, f. The higher the viscosity of the smoothing agent; the lower the sound pressure level; but the smoothness of the grease; the viscosity and the shape of the soap fiber can affect the noise value.
The origin of the raceway sound is caused by the natural oscillation of the ferrule after the load. Because the elastic touch of the ferrule and the tumbling body constitutes a nonlinear oscillating system. When the smoothness or the machining accuracy is not high, the elastic characteristic is aroused. Related natural oscillations; it becomes noise when transmitted to the air. It is well known; even if the world's most sophisticated production skills are used to process bearing parts; there will always be a few minor errors in the appearance of the work; then the raceway and rollover will be made. The small shake of the inter-body attack stimulates the natural oscillation of the oscillation system. Although it can not be avoided, it can adopt the high-precision machining of the external parts of the workpiece; correctly select the bearing and accurately use the bearing to reduce noise and vibration.
2. Falling body tumbling noise This is generally the case; most of the large bearings that exhibit low radial loads and receive radial loads. When the bearings are operated under radial loads; the load and non-loading areas within the bearing; if the bearings have a certain radial clearance The roll body and the inner raceway in the non-load zone do not touch; but the centrifugal force can touch the outer ring; for this reason; at low speed; when the centrifugal force is less than the weight of the roll; the roll collar will fall and roll with the inner roll The track or the frame is bumped and arouses the natural oscillation and noise of the bearing; and has the following characteristics: a. It is easy to attack when the fat is smooth; it is not easy to attack when the oil is smooth. It is more likely to occur when the smooth fat is used. b. Winter often attacks. c. It is also easy to attack when only the radial load is applied and the radial clearance is large. Bearings that also occur at a certain scale and have different scales have different speeds. e. Can be a continuous sound can also be intermittent sound. f. The forced oscillation often arouses the second-order and third-order tortuous oscillations of the outer ring; then the noise is announced. It can be useful to reduce the noise after the preload method is selected; the radial clearance of the bearing operation after installation is reduced; Some improvements have been made; some foreign companies have adopted lightweight tumbling bodies; such as ceramic rollers or hollow rollers to avoid this kind of noise.
3. It is a scream of appropriate violent squeaking of metal sliding conflicts; although the bearing temperature rise is not high at this moment; it does not affect the bearing life and smooth grease life; it does not affect the rotation; Uncomfortable; especially for large short cylindrical roller bearings that accept radial loads; this feature is: a. When the radial clearance of the bearing is large, it is easy to attack. b. Generally present in grease smooth; oil is more rare. c. Following the increase in bearing size, the page is reduced by è°€.d. Winter often presents .e. Its presentation is irregular; and it is not predictable; and it is related to the amount of fat filling and function, and the operating conditions of the device. This noise can be avoided by reducing the radial clearance of the bearing and using the shallow outer ring raceway layout.
4. Adhering to the free oscillation of the frame during the rotation of the bearing and its impact with the roll or ferrule will announce this noise. It can be presented in all types of bearings; but its sound pressure level is not too high and is Low frequency. Its characteristics are: a. Stamping holders and plastic holders can be attacked. b. Whether it is thin oil or grease smooth, it will present .c. When the outer ring accepts bending moments, it is most likely to occur. When the radial clearance is large, it is simple to present.
Because it is necessary to adhere to the gap of the pocket and the gap between the bracket and the ferrule in the bearing product; therefore, it is not easy to completely eliminate the sound of the bracket; but it can be improved by cutting the installation error; .
Another kind of sticking special sound is because the conflict between the supporting frame and the guiding surface of other bearing parts causes the self-excited oscillation of the holding frame to sizzle. The punching of the deep groove ball bearing is more than that of the 蚝 蚝 蚝婺诘 婺诘 淝斩冉 停 停 停 逦榷ㄐ 逦榷ㄐ 逦榷ㄐ 逦榷ㄐ 逦榷ㄐ 逦榷ㄐ 逦榷ㄐ 逦榷ㄐ 逦榷ㄐ 逦榷ㄐ 逦榷ㄐ 逦榷ㄐ 逦榷ㄐ 逦榷ㄐ 逦榷ㄐ 逦榷ㄐ 逦榷ㄐ 逦榷ㄐ 逦榷ㄐ
When the bearing is under the radial load effect and the grease function is poor; the noise of “咔嚓, 咔嚓” will be heard at the beginning of the operation; this is mainly because the tumbling body is released from the load zone; the tumbling body is suddenly accelerated and adheres to the frame. The noise announced by the collision; this kind of impact can not be avoided but will not be seen after a period of operation.
The way to avoid sticking noise is as follows:
a. In order to ensure the stability of the auger movement; the ferrule guiding method should be selected as much as possible and the guiding surface should be given ample smoothness; the tapered roller bearing layout under high-speed working conditions should be improved; the roller-guided L-shaped holding frame should be changed to a set. Z-shaped frame supported by the rim.
b. When the bearing rotates at a high speed; the bearing with large pockets has a oscillation amplitude that is much larger than the oscillation amplitude of the bracket with a small gap; therefore, the value of the pocket gap is particularly important.
c. Pay attention to minimize radial clearance.
d. Try to improve the accuracy of the production of the price; improve the quality of the appearance of the frame; help reduce the noise of the rollover and the collision of the frame.
e. Actively use leading cleaning skills; useful complete removal of spare parts and finished products; improve the cleanliness of bearings.
5. The tumbling body is oscillated when the bearing is operated under radial load; only a few tumbling bodies are required to receive the load inside; because the "stretched spring" support formed by the elastic touch of the ferrule causes the tumbling body to pass through the radial load effect line. Periodic oscillations; the middle of the shaft will move up and down or horizontally; cause noise together. This type of oscillation is called the roll body oscillates; especially in low-speed operation.
The amplitude is related to the bearing type, radial load, radial clearance and the number of rolling bodies. Generally, the amplitude is higher than that of the 粽穹笫 判 晌 晌 晌 Γ Γ Γ Γ 捎 捎 捎 捎 捎 捎 捎 捎 捎 捎 捎 捎 捎 捎 蚴┘ 蚴┘ 蚴┘ Real cerebral palsy test tube lip file.
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