Thermal oil pump bearing damage causes and solutions?
Thermal oil pump bearing damage causes and solutions? First, the thermal oil pump bearing overload - overload, this is the reason, as tired to work too tired, causing premature fatigue (including over tight fit, cloth hardness dent and preload) Fatigue failure. Overload caused by contact stress exceeds the agreed value. Reduce the load or re-design ---- If the system is always overloaded, the idea can be re-selected bearings; System short-term overload and impact load, can be thought of progress in lubrication, bearing special treatment to solve Second, the thermal oil pump bearing withstand high temperature, overheating ---- This is the performance .As the "fever." Signs are the raceway, the ball and the cage color change from gold to blue ---- light Degree of lubricant discoloration, and even attached to the raceway or roller. Heavy bearing parts blue discoloration. Severe bearing parts of the metal activity. Temperature exceeds 400F so that the raceway and the body material annealing ---- This is to say The effect of high temperature on the mechanical properties of the bearing Lowers the bearing capacity and leads to early bearing failure - the bearing raceway or roller hardness is lower than HRC58, the life expectancy is reduced, causing severe deformation, the other temperature decreases and broken Lubricants ---- One conclusion is: the bearing must have a certain operating viscosity above the lubricant; temperature increases will reduce the viscosity of lubricants, and even affect its basic chemical functions. Third, heat-conducting oil pump bearing hardness dent ---- "True Brinell indentation." Occurs when the load exceeds the elastic limit of the raceway - Normally caused by a radial impact load. Dents on the raceway increase vibration (noise) Any static overload and harshness Impact generated cloth dent ---- Such damage is generally left in the indentation grinding marks .Fourth, the heat pump oil pump pseudo-dent - "false Brinell indentation." In each Oval wear pits, produced by ball positions, are smooth, have significant boundaries, and are abraded near - not always in shape - typically with no signs of grinding in the indentation, indicating severe external vibration - --- not sure? Isolation and use of anti-friction additives ---- usually caused by the flutter in transit Fifth, the normal fatigue failure ---- exhaustion damage Heat-conducting oil pump bearing fatigue failure refers to the raceway and the movement of fragmentation, And the resulting material fragments fall off - with fatigue fragmentation (as seen in the hardened steel) and wear out of the exfoliation (found in carburized bearing steel) .This fatigue is gradual, once expanded rapidly, and with Significant increase in vibration ---- hardened steel is generally rapidly expanding, easily lead to instantaneous damage. Carburized steel will have a longer period of development.Replace the bearings, and design longer wear and tear of the bearing life should ----- Said the use of higher rated dynamic load bearing, bearing steel of higher purity, etc .. Sixth, the reverse heat load oil pump ---- anomalous load. Angular contact bearings designed to accept only one direction of axial load when the direction On the contrary, the oval contact area of ​​the outer ring is flattened ... The result is increased stress, increased temperature, and increased vibration and early failure of the bearing seventh, heat conduction oil pump bearing internal pollution ---- foreign matter that is contaminated One of the main reasons for the failure is the sign of pollution is a little marks on the surface of the raceway and the body, resulting in increased vibration and wear and tear clean environment, tools and norms. Storage and transportation of new bearings. Eighth, thermal oil pump bearing lubricant failure - --- Lubrication failure. Heat transfer oil pump bearing raceway and roller discoloration (blue, brown) is a sign of lubrication failure, resulting in raceway, roller and cage wear, leading to overheating and severe failure .--- - Early is a slight glass-like scars on the surface of the raceway. The normal operation of the moving bearing depends on the presence of a good film of oil between the components. Failure is often caused by insufficient lubrication and overheating - Incorrect lubrication (excessive lubricant, Over silk), and invalid lubrication (wrong lubrication, off the oil, not timely replacement) for two reasons.Ninth, erosion - a foreign body into the water.The signs are in the raceway, Roller, cage or other places appear reddish brown areas ---- early rust color, the general common black because of contact with aggressive fluids and gases under severe conditions, the erosion caused by early bearing fatigue failure Remove the corrosive fluid, as far as possible the use of the overall sealed bearings ---- sealed bearings are not preferred .Each bearing has its sealing system, the hub is to make it effective.Second, the heat pump long-term different heart ---- partial load. Signs of disagreement error is the ball in the raceway wear marks and the raceway edge is not parallel If the error of more than 0.001in / in, there will be abnormal bearing and bearing temperature rise, and cage ball wear ---- different Of the bearing types have different allowable partial load.Generally self-aligning bearings have the best partial load capacity.However, other bearings can be achieved by increasing the geometry of the raceway to increase the capacity of a certain partial load capacity eleventh, the heat transfer oil pump Bearings and spindles. Loosening with ---- this injury is more rare. Heat pump bearings with loose lead to the relative movement of the mating parts, if this relatively slight but not interrupted movement, the resulting wear ---- Xi called "creep" This wear creates particles and oxidizes to a special brown color, which leads to increased grinding and looseness.
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