YHB vertical gear pump oil seal oil phenomenon analysis and control methods 1. The impact of parts manufacturing quality (1) oil seal quality. If the geometry of the oil seal lip is unqualified, the tightening spring is too loose, etc., causing air tightness test leaks, and the YHB vertical gear pump is loaded into the main engine and then simmered. Analysis and control method of oil seal of YHB vertical gear pump oil seal Mining Truck Parts,Mining Machine Parts,Mining Tipper Truck Parts,Mining Truck Spare Parts JINING SHANTE SONGZHENG CONSTRUCTION MACHINERY CO.LTD , https://www.stszcmparts.com
1. Impact of parts manufacturing quality (1) Oil seal quality.
If the geometry of the oil seal lip is unqualified, the tightening spring is too loose, etc., causing air tightness test leaks, and the YHB vertical gear pump is loaded into the main engine and then simmered. At this point, the oil seal should be replaced and the material and geometry should be inspected (the domestic oil seal has a larger quality difference than the foreign advanced oil seal).
(2) Machining and assembly of YHB vertical gear pump.
If there is a problem in the processing and assembly of the YHB vertical gear pump, the center of rotation of the gear shaft and the front cover stop will be different, which will cause the oil seal to be eccentric. At this time, the symmetry and displacement of the front cover bearing hole to the pin hole and the coaxiality of the skeleton oil seal to the bearing hole should be checked.
(3) Sealing ring material and processing quality.
If this problem occurs, the seal ring will be cracked and scratched, resulting in a secondary seal that is not strict or even fails. The pressure oil enters the skeleton oil seal (low pressure passage), and the oil seals the oil. In this case, check the material and quality of the seal ring.
(4) Processing quality of variable speed pump.
The feedback information obtained from the main engine factory and the YHB vertical gear pump oil seal oil assembled with the variable speed pump are more serious, so the processing quality of the variable speed pump also has a greater impact on the oil. The variable speed pump is mounted on the output shaft of the transmission and is mounted on the output shaft of the transmission through the positioning of the shifting pump. If the end face of the shifting pump is out of tolerance (verticality) of the center of rotation of the gear, the gear will also be made. The center of the shaft rotation does not coincide with the center of the oil seal and affects the seal. During the processing and trial production of the variable speed pump, check the coaxiality of the center of rotation of the rotary center and the runout of the end face of the stop.
(5) The front cover oil return passage between the skeleton oil seal of the YHB vertical gear pump and the seal ring is not smooth, causing the pressure here to rise, thereby breaking through the skeleton oil seal. By improving this, the pump's oil slick phenomenon has been significantly improved.
2. The influence of YHB vertical gear pump and mainframe installation quality (1) The coaxiality of YHB vertical gear pump and mainframe installation is less than 0.05.
Usually the working pump is mounted on a variable speed pump, which in turn is mounted on the gearbox. If the end face of the gearbox or variable speed pump is out of tolerance to the center of rotation of the spline shaft, a cumulative error is formed, causing the YHB vertical gear pump to withstand radial forces at high speeds, causing the oil seal to simmer.
(2) Is the installation clearance between the components reasonable?
YHB vertical gear pump external stop and variable speed pump internal stop and external spline and gearbox spline shaft spline, the gap between the two is reasonable, have an impact on the YHB vertical gear pump oil. Because the inner and outer stops belong to the positioning part, the matching clearance should not be too large; the inner and outer splines belong to the transmission part, and the matching clearance should not be too small to eliminate interference.
(3) YHB vertical gear pump 窜 oil is also related to its spline rolling button.
Because the YHB vertical gear pump shaft extension spline has a short effective contact length with the gearbox output shaft, the YHB vertical gear pump transmits a large torque during operation, and the spline is subjected to large torque and crush wear and even Rolling keys, generating huge heat, Bo Taibang caused the burnt and aging of the rubber seal of the skeleton oil seal, resulting in oyster sauce. It is recommended that the main engine factory select the YHB vertical gear pump to check the strength of the shaft extension spline to ensure sufficient effective contact length.
3. Influence of hydraulic oil (1) The cleanliness of hydraulic oil is too poor, the pollution particles are large, and various hydraulic control valves and sand and welding slag in the pipeline are also one of the causes of pollution.
Because the shaft diameter of the gear shaft and the clearance of the inner hole of the seal ring are small, large solid particles in the oil enter between them, causing wear, scratching or rotation with the shaft of the seal ring, so that the secondary seal pressure oil enters the low pressure zone ( At the skeleton oil seal), the oil seal is broken down. At this time, the new anti-wear hydraulic oil should be filtered or replaced.
(2) After the viscosity of the hydraulic oil decreases and the quality deteriorates, the oil becomes thinner. Under the high pressure state, the leakage through the secondary sealing gap increases, and the pressure in the low pressure region rises due to the lack of oil return, thereby breaking the oil seal. It is recommended to test the oil regularly and use anti-wear hydraulic oil.
(3) When the working time of the main load is too long and the oil level of the fuel tank is low, the oil temperature can be raised to 100 °C, causing the oil to become thinner and the skeleton oil seal to aging, thus causing the oil; the tank liquid should be checked regularly. The height of the surface is to avoid excessive oil temperature.
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