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 Analysis of loader gear lubrication pump channeling the oil seals |
| Gear lubrication pumps channeling oil, hydraulic oil skeleton oil seal breakdown overflow. This is widespread, reflecting the strong OEM gear lubrication pumps channeling oil seriously affect the use of the normal work of the loaders and gear lubrication pump reliability and environmental pollution. help solve the problem, now to analyze the causes and control methods of gear lubrication pump channeling the oil seals.
A parts manufacturing quality.
(1) oil seal quality.
Such as the oil seal lip geometry of the failure, tightening of the spring is too loose, causing the air tightness test leak, gear lubrication pump into the main channeling oil. You should replace the oil seal and test the material and the geometry of (domestic oil seal quality gap compared with advanced foreign oil seal).
(2) the processing of gear lubrication pump assembly.
Should the gear lubrication pump fabrication, assembly, resulting in the gear shaft rotation center and the front cover of the Mouth of heart, will cause oil seal eccentric wear. You should check the cover bearing bore of the pin hole symmetry, displacement, skeleton oil seal on the bearing bore concentricity.
(3) sealing ring material and processing quality.
If this is a problem, resulting in the sealing ring cracks and scratches, resulting in secondary sealing leakage or even failure, the pressure oil into the skeleton oil seal (low pressure channel), thus channeling the oil seals. You should check the material and processing quality of the seal ring.
(4) the processing quality of the variable speed pump.
Feedback from OEMs, gear lubrication pump assembly with variable speed pump with channeling the oil seals problem is more serious, so the processing quality of the variable speed pump for channeling oil had a greater impact. Variable speed pump mounted on the gearbox output shaft, gear lubrication pump variable speed pump only mouth positioning mounted on the gearbox output shaft, if the variable speed pump only port-side face of the gear rotation center of the beating ultra-poor (verticality) also gear shaft rotation center and seal center do not coincide affect the seal. The processing of variable-speed pump, the trial process, you should check the rotation center on the concentricity of the Mouth and beat the end of the Mouth.
(5) the front cover between the skeleton oil seal and the seal ring of the CBG gear lubrication pump oil return channel is not smooth, resulting in here pressure to breakdown the skeleton oil seal. Through the improvement herein, the pump oil channeling phenomenon has been dramatically improved. Its structure is shown in Figure 1.
2 gear lubrication pump with the host installation quality.
(1) the installation of gear lubrication pump and host the concentricity of less than 0.05.
Usually working pump installed in a variable speed pump, variable speed pumps installed in the gearbox. If the transmission or variable speed pump-side face of the splined shaft rotation center of the beating ultra-poor, form a cumulative error, resulting in gear lubrication pump radial force in the high-speed rotation state, resulting in channeling the oil seals.
(2) between the components of the installation gap is reasonable.
Gear lubrication pump, only the spline and transmission to spend the mouth and the only port in the variable speed pump and gear lubrication pump shaft splines, both clearance fit is reasonable on the channeling of gear lubrication pump oil influential. Because, outside the mouth of the positioning part, with the gap should not be too large; internal and external splines belong to the transmission part, with the gap should not be too small to eliminate the interference.
(3) Gear lubricating pumps channeling oil and its spline roller key relationship.
Spend a key to the gearbox output shaft spline effective contact length is short due to gear lubrication shaft extension, while the torque of the larger gear lubrication pump work when passed, the spline withstand high torque occurs extrusion wear or rolling key The giant hot, resulting in a skeleton oil seal rubber lip burns, aging, thereby channeling oil. The proposal chosen mainly gear lubrication pump should be extended checking gear lubrication shaft spline strength to ensure adequate and effective contact length.
(3) the impact of hydraulic oil.
Ultra-poor (1) hydraulic oil cleanliness, pollution particles, a variety of hydraulic control valves and piping, sticky sand, welding slag, etc. is also one of the source of contamination.
Gear shaft of the shaft and the seal ring bore clearance is small, the larger solid particles in the oil in the meantime, causing the hole in the seal ring wear, scratches, or with the axis, resulting in a secondary seal pressure oil into the area of low pressure ( skeleton oil seal), resulting in the oil seal breakdown, this time should be filtered or replaced with new anti-wear hydraulic oil. |
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