1. Forced vibration caused by power input and fixed connectors
(1) The engine power is insufficient and the operation is not stable.
(2) The spline of the pump input shaft is worn, the transmission connecting plate and the vibration damping connecting plate are damaged, and the universal joint of the crosshead of the transmission shaft is worn.
(3) The fixing bolts of the pump are loose due to long-term operation, and the brackets are not firmly fixed.
(4) The coaxiality between the pump and the engine is out of tolerance, which increases the additional load generated by the eccentric operation of the pump.
2. The vibration and noise of the pump itself
(1) The oil pump sucks a lot of air and generates vibration and noise due to lack of oil, sand holes at the low-pressure oil inlet of the pump casing, and poor sealing of the low-pressure oil suction port pipeline.
(2) The oil inlet filter is blocked or the rubber of the oil inlet pipe is aged.
(3) The amount of oil entering the plunger cavity is insufficient due to the wear of the valve plate or the oil inlet valve of the pump, and the sealing performance is reduced, and the pump flow is permanently moved and vibration is generated.
(4) In winter, the oil temperature is low, the oil viscosity is too large, and the oil absorption is insufficient, resulting in noise.
(5) The pump inlet valve seat is loose, the oil inlet spring is damaged, the oil outlet valve seat is loose, the oil outlet valve spring is broken or the elastic force is insufficient, etc., which will make it difficult to seal the high pressure chamber of the pump, causing some plunger oil pumps to be weak and uneven flow. cause the pump to vibrate.
(6) The screw holes of the high and low pressure valve seats on the valve-type valve plate have become unbalanced due to the poor processing quality or the deformation of the thread after long-term use, or the iron filings are not cleaned thoroughly, resulting in an unbalanced force on the valve surface after the new valve is installed. , causing the valve to vibrate without sealing.
(7) The exhaust hole at the high-pressure oil outlet valve cannot discharge the air in the plunger cavity, and the exhaust space is blocked, causing vibration.
(8) The plunger and the cylinder are strained, the cylinder parts are eccentrically worn and cracks appear, etc., causing vibration.
(9) On the crankshaft radial piston pump, the clearance between the connecting rod and the crankshaft is too large, and the clearance between the connecting rod and the connecting rod pin seat hole is too large, which will cause shock vibration.
(10) Vibration caused by excessive tolerance of cylinder size, shape and position of radial piston pump.
(11) Poor positioning accuracy of the pump shaft support bearing, the gap between the inner and outer rings of the bearing installation does not meet the design requirements, and the axial positioning adjustment is unreasonable, all of which will cause the pump to generate vibration and noise.
(12) The indexing error of the seven plunger holes on the rotating cylinder of the inclined axis pump is too large, and the dimensional accuracy of each hole is low, which will cause vibration and noise during high-speed operation.
3. The vibration load caused by the load (load) and the unreasonable speed regulation of the control element
For example, when the pressure of the speed limit valve and the back pressure valve is unbalanced, the system will vibrate: the failure of the speed limit valve or the back pressure valve will cause vibration: the failure of the special system pump will cause the main pump to vibrate due to air suction: the oil outlet pipe of the pump is too long , The fixation is not firm, causing mutual collision.
