Water Pump Bearing Lubrication maintenance
Water pump bearing lubrication maintenance (1) the new use of the pump, usually after 100 hours to run to replace the grease (oil), after each run 500 hours to replace 1 times. (2) the use of grease lubrication of the flow of bearings, after 1500 hours of operation, should be replaced with grease, filling the amount of oil can not be too much or too little, because too much grease or too little will cause the bearing heat, In the bearing chamber volume of 1/2 ~ 2/3 is appropriate. (3) For lubricating oil bearings, the amount of oil should be added to the specified position. (4) Sheng lubricants or grease containers to be clean, usually should be sealed, there should be no dust, iron and other debris, so as not to damage the bearings (5) motor bearings generally use sodium grease, this grease It is characterized by high temperature (125 ℃), but easy to dissolve in water, it can not be used for water pump bearing lubrication.
Scratch (two - body abrasive wear) Hard particles moving with the shaft diameter in contact with the friction surface, which is the contact stress between the particles and the metal surface, they draw a linear wound on the surface of the pad; semi - embedded bearing surface Of the hard particles in the shaft diameter surface will also draw a linear scar, are called scratches. Scratch is a two-body abrasive wear, linear scars and the direction of the direction of movement consistent with the axis. Lubricating oil film rupture, shaft diameter surface of the hub peak will also scratch the bearing, there are many linear scars, it is also two body abrasive wear. Hard particles embedded in the bearing surface and fall off, causing scratches of scratches. Most of the above particles are iron and sand. Scratch causes the surface of the friction surface to roughen, thereby reducing the carrying capacity of the lubricating oil film, and will form a new scratchable friction surface of the hard particles and hub peaks, resulting in a vicious circle. 2. (three body) abrasive wear into the bearing gap between the smaller hard particles, wandering between the two friction surfaces, in the friction surface to produce high contact stress, constitute three body abrasive wear, similar to the grinding effect, so that Bearing and shaft diameter surface wear. The high contact stress between the hard particles and the frictional surface causes plastic deformation or fatigue damage to the frictional surface of the ductile metal, causing the frictional surface of the brittle metal to crack or peel off. Abrasive wear scar is also linear, the direction of movement with the axis of the same direction. When the edge of the contact, the lack of oil or oil film rupture, etc. will produce severe abrasive wear. Abrasive wear will lead to shaft diameter and / or bearing geometric size and shape changes, the accuracy of loss, bearing clearance increases, so that the performance of sliding bearings in the life expectancy before the rapid deterioration. 3. Bite stick (gluing) In the lubricating oil film rupture or lack of oil in the state, a large friction factor resulting in a lot of friction heat, bearing temperature. At high temperatures, a low melting point metal on a frictional surface adheres to the other friction surface due to softening, with the shearing action of the rotational movement of the shaft diameter, the adherent metal is disengaged from the original surface and transferred to another friction surface, Resulting in frictional surfaces with obvious pits and bumps. This damage is an adhesive wear. When the bite, there is a sharp increase in friction, bearing temperature is further increased, the formation of a vicious cycle. When the adhesion is serious, the shaft diameter of the power can no longer cut off the bond point, the shaft diameter movement will be terminated, commonly known as "bearing axis", bearing completely damaged. 4. Fatigue wear fatigue wear, also known as fatigue damage. Under the repeated action of the cyclic load, fatigue cracks appear on the friction surface in the direction perpendicular to the sliding direction. The crack develops perpendicularly to the surface of the bearing pad, and reaches the surface of the lining and the back surface, and extends to the friction surface parallel to the friction surface, The final material from the friction surface was stripped down, resulting in pit-like damage.