Analysis of Whine Noise in the Balance Gearbox of a Certain Automobile Engine
NVH testing was conducted on the balance gearbox with whine noise and the whine order was identified.It was found that this order is not a characteristic order of gears and bearings in the balance gearbox.By exchanging the components of the balance gearbox with whine noise and the normal balance gearbox one by one,it was determined that a certain needle roller bearing was faulty component.Upon testing all the needles of the needle roller bearing,it was found that the waviness amplitude of a certain wave number of a certain needle roller significantly exceeded the standard.The order calculated based on the wave number of the waviness matches the whine order,indicating that the abnormal waviness of the rolling needle caused the whine noise.The verification was carried out by exchanging the abnormal waviness rolling needle of the balance gearbox with whine noise and the normal balance gearbox rolling needle,and the verification results also showed that the whine noise was caused by the abnormal waviness rolling needle.Control measures have been developed to address the issue of waviness,and there have been no similar whine noise issues since the implementation of the measures.
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