Specification using bearing matters needing attention

We will start with simple introduce bearing rolling, the size of the rumbling and quality check sound device should be used for inspection of bearing in operation, with advanced tools can accurately judge the problem, bearing even with slight stripping damage, such as would an exception and irregular, and with the sound of the measuring device can distinguish. Then bearing vibration test to check the bearing damage is very sensitive, peeling, indentation, rust, crack and wear will be reflected in the bearing vibration measurement, therefore, through the use of special bearing vibration tester ( Frequency analyzer, etc. ) Can measure the size of the vibration, through frequency points cannot deduce the abnormal situation. However each machine measured values for bearing or sensor installation position and different using conditions, thus requiring prior to each machine is analyzed by the measured value of the determined after judgment standard. 1. Mechanical damage serious when in contact with the appearance of metal strip and a massive mixed and disorderly cut; In general, bearing mechanical damage is refers to the bearing alloy appearance appear different levels of the trench. Contact surface damage and ablation phenomenon is the main cause of bearing mechanical damage is difficult to form the oil film bearing appearance or oil film were severely damaged. 2. Plastic deformation in the surface layers of bearing outside the cavitation and cold work hardening, sliding bearing in cylinder pressure impact load) Under the action of repeated. Partial loss of the deformation ability, and gradually form lines and expanded, and then with the shedding of wear debris, the outside surface of the load the form. Pits of the cavitation, general bearing bush came first, then gradually expand the pits of the interface crack, and lead to an alloy layer along the interface crack parallel to the direction of extension, until it is peeling off. Sliding bearing of the main causes of cavitation is due to structural elements such as oil groove and oil hole cross-sectional sudden change of oil flow caused by strong disturbance, oil flow disorder of empty space form bubbles, then because of the pressure, generate cavitation bubble breaking. Cavitation occurs commonly in high load bearing, such as the crankshaft main bearing on the lower bearing. 3. Fatigue pitting because of overworked, engine bearing fatigue pitting refers to. Making bearing overheating and bearing clearance is too large, the central bearing fatigue damage and fatigue pitting or fall off. This kind of damage is mostly to overload, bearing clearance is too large, or lubricating oil is not clean, and mixed with caused by foreign bodies. Therefore, when using, should pay attention to prevent the bearing work don't overload with too low or too high speed operation; To adjust the engine to idle speed stable state; To ensure the normal bearing clearance, prevent engine speed too high or too low; Check, adjust the performance of the cooling system, to ensure that the engine working at a comfortable temperature. 4. Units in the lubricating oil bearing alloy corrosion of chemical impurities ( Acidic oxides, etc. ) Make bearing alloy oxidation and acid generated, bearing alloy corrosion is generally area for the lubricating oil is not pure. Bearing alloy local shedding, forms the rule of no small hiatal or small pits. Bearing alloy corrosion is the main reason of the improper selection, lubricating oil bearing material corrosion resistance is poor, or the rough, the high temperature engine work. 5. Bearing burning-out forming local high temperature, between journal and bearing friction pair with tiny bump metal surface in direct contact. Lack of lubrication, cooling and bad situation, make the black or local burning-out bearing alloy. This failure is often caused by journal and bearing with tight; Lubricating oil pressure lack of also easy to make bearings burned.