A motor bearing vibration
1. Cause Analysis
(1) rotor imbalance; (2) gearbox input-side coupling the rubber rod diameter of the thin side and the coupling bore wear, the gap is too large; (3) gearbox gear meshing tip clearance is too large or tooth wear ; (4) bearing a top side of the gap is too large; (5) the viscosity of the oil is low.
2. Precaution
(1) the motor rotor dynamic balancing test; (2) update the motor and reducer to connect the flexible coupling, and adjust; (3) optimize the diameter of the rubber truncheon; (4) adjust the reducer wheelbase to ensure reasonable tip clearance to ensure that the two axes parallel; (5) appropriate to reduce the bearing clearance; (6) may be considered to increase the viscosity of the oil.
B, Bush fever or roll tile
1. Cause Analysis
(1) Bearings ministerial improper gap, less than the standard value in the operation of oil supply shortage, poor lubrication, resulting in bearing heating; (2) In the start, stop and reverse (especially oil off the start), the motor starts and film a time difference is too short will cause the instantaneous oil, boundary friction state, so that the film rupture, bearing partial contact with the shaft, friction and heat; (3) oil tank level below the lower limit, the oil pump suction air for a long time, causing the hydraulic oil inadequate; (4) assembly of non the hole clogged or The bearing clearance mat ran to block the part of the hole, so that the amount of oil to reduce; (5) connected to the two bearing concentricity error, caused by unilateral contact local lack of oil, leading to bearing fever or partially braided watts; (6) for a long time overload, the bearing oil film is destroyed; (7) oil viscosity decreased.
2. Precaution
(1) to prevent the cause boundary friction, increase the hydraulic oil due to low oil viscosity, improved lubrication system, the use of extreme pressure additives or high viscosity of the lubricant; (2) to be guaranteed under the premise of the oil quality, there is sufficient the amount of fuel supply; (3) on the pump switch add delay to ensure that the pad after the normal fuel supply to start the motor; (4) when the bearing temperature rises to 130 ° C when taken circulatory system with an external cooling device or increase the cooling system to ensure good ventilation, reduce the oil temperature; (5) as a result of shaft bearings at both ends concentricity error caused by bearing unilateral contact, adjust the the bush seat or center under the circumstances, to improve the state of the shaft and the bearing contact, a careful run-in; (6) balanced production, ultra-load operation for a long time.
C, bearing wear
1. Cause Analysis
(1) between the groove and pull groove of the lubricant film thinning or damaged, leading to local wear of bearings; (2) the installation axis deflection, load, partial load bearing steel back with the bearing hole hard point and not enough oil, shaft or bearing stiffness causes abnormal wear of sliding bearing; (3) foreign matter from entering the bearing face, when foreign matter more than the minimum film thickness, the destruction of the film, leading to wear and tear occurs; (4) the oil is too small caused by low oil pressure lubricating oil supply is inadequate or interrupted, it is not possible to establish normal oil film, causing the shaft and in direct contact with metal cause wear or fever; (5) due to improper assembly, the bearing and the bearing interference fit poorly, the bearing cap dislocation, hole position deviation, shaft and bearing centerline deflected, resulting in a loose bearing, bearings and bearing in Fasheng jog or contact is not entirely caused by bearing wear and even flaking; (6) bearing over poor degree of interference. Relative motion, causing no interference will make the back of the bearing steel and bearing the flank wear steel back; excessive interference of the bearing bore out, is not easy to form a film, leading to premature wear or even killed.
2. Precaution
(1) to develop a scientific system of maintenance. Regular maintenance lubrication system, regular inspection of pumps, filters, coolers, regular and comprehensive determination of the quality indicators of lubricant oil quality; (2) the appropriate choice of lubricants, use smaller mesh filter; (3 ) before assembly lubricant Road thorough cleaning, installation avoid introducing foreign matter. Bearing seal and pipe seals in good condition to maintain efficient working condition of the oil filter; (4) to improve the design of grooves and holes, optimizing the oil line position, to ensure the normal oil line to prevent oil spills; (5) to improve the assembly process, select bearing appropriate amount of interference, the elimination of the bearings back and other assembly parts of the foreign body.