Influence of bearing structure on the vibration and noise.
The 4 holder of sound
Keep the free vibration of frame and the rolling body or ring phase impact will send this noise in the bearings rotate process. It may appear in all kinds of bearing, but its sound pressure level is not too high and the low frequency. Its characteristic is:
A. stamping cage and plastic holder can be generated.
B. either oil or grease will appear.
C. when the outer ring bearing the bending moment is most likely to occur.
D. radial clearance large easily.
Because the cage pocket clearance and the holder and the ring gap is inevitable in bearing product to exist, thus completely eliminate cage sound is very difficult, but can reduce the assembly error, gap optimum and cage movement to improve.
Another cage special sound is due to the holder and the other bearing parts leading between the rubbing surfaces caused maintain self-excited vibration and noise frame. flanged ball bearing Stamping of deep groove ball bearing retainer is thin, curved in the radial and axial in-plane stiffness is low, the overall stability is poor, will the bearings rotate at high speed due to bending deformation caused by self-excited vibration, "beep".
When the bearing under a radial load and oil poor performance situation, at the beginning of operation "Kacha, Kacha hear noise", which is mainly due to the rolling body left in the load zone, noise suddenly accelerated and cage collision by rolling, the sound of impact can not be avoided but with wind power bearing running for a period of time will disappear.
To prevent the holder noise measures are as follows:
A. cage revolution motion stability, should as far as possible by the ring guide way and pay attention to guide the full lubrication, give the improvement of bearing structure of high speed conditions, the L type roller guide holder is changed to Z type ring rib guide holder.
B. bearings rotate at high speed, bearing slewing bearing pocket clearance of the cage vibration amplitude is much larger than the pocket hole cage vibration amplitude gap is small, so the pocket clearance value is very important.
C. should pay attention to reduce the radial clearance.
D. try to improve manufacturing precision frame maintain, improve the surface quality of the holder, helps to reduce body roll and keep the noise frame collision or friction.
E. actively adopt advanced cleaning technology, cleaning effective parts and the set of products, improving the cleanliness of bearing.
没有评论:
发表评论