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Gear Unit Operation: Testing, Startup, Condition Monitoring
Published in Peter Lynwander, Gear Drive Systems, 2019
The oil pressure should be monitored at the entrance to the unit downstream of any pressure regulation device. Low oil pressure can indicate internal leakage such as a cut static seal or possibly low flow due to pump distress. This can lead to oil starvation of components; therefore, low oil pressure must be investigated and corrected. High oil in pressure can be an indication of downstream blockage such as a clogged oil jet and therefore must also be investigated and corrected. A fluctuating oil pressure can be an indication of pump cavitation due to poor inlet conditions such as excessive pressure drop or air leakage in the pump inlet line. When setting oil pressure limits it must be remembered that the pressure will be affected by variables such as oil temperature and viscosity and jet size variation downstream of the pressure measurement. Pressure in the gearbox cavity will also directly affect the feed pressure.
Tuning and customizing
Published in Andrew Livesey, Motorcycle Engineering, 2021
Relief valve – The operating pressure of the relief valve may be changed; this may be by changing the spring, adjusting the spring setting, or replacing the complete assembly. Usually increasing the oil pressure by about 10% will provide the ability to cope with greater bearing loads caused by engine power increases. Typically, oil pressure is 60 to 100 psi (4 to 7 bar).
Modifications
Published in Andrew Livesey, Advanced Motorsport Engineering, 2012
Relief valve – the operating pressure of the relief valve may be changed, this may be by changing the spring, adjusting the spring setting or replacing the complete assembly. Usually increasing the oil pressure by about 10% will cope with greater bearing loads caused by engine power increases. Typical oil pressure is 60 to 100 psi (4 to 7 bar).
Intelligent Detection and Real-time Monitoring of Engine Oil Aeration Using a Machine Learning Model
Published in Applied Artificial Intelligence, 2021
Vainatey Kulkarni, Xiaoye Han, Jimi Tjong
The oil pressure was used as the real-time indicator of oil aeration under the theory that more air trapped in the oil would lead to a greater degree of fluctuation and variance in the oil pressure as the oil was compressed by the oil pump. Besides its original functionality, the oil pump was essentially used as a testing device for oil aeration detection purpose. Therefore, a high-speed oil pressure sensor was mounted on the oil gallery passages closest to the oil pump outlet to record the engine oil pressure. Oil pressure data from the mounted sensor was recorded with high speed data acquisition system triggered by an engine mounted encoder. The resulting oil pressure was recorded in the data acquisition system with a constant 1 degree crank angle resolution, independent of the engine operating speed. Due to the fixed sampling rate of the data acquisition system in reference to the engine speed, this paper will refer to all frequency measurements in engine order as opposed the Hertz. An engine order of 1 signifies a frequency occurring once every rotation of the engine crankshaft. The data acquisition was conducted over 300 combustion cycles of the engine (each consisting of 720 degrees of crank angle rotation for a four-stroke engine) and the resulting signal was cycle-averaged in the crank angle domain to yield a single trace consisting of oil pressure measurements with 1 degree crank angle resolution over 720 crank angle degrees.
Modeling and identification of hydraulic servo systems
Published in International Journal of Modelling and Simulation, 2018
Magdy A. S. Aboelela, Mohamed El-Sayed M. Essa, M. A. Mustafa Hassan
The main purpose of the experimental setup is to estimate a model for piston position of HSS. A real time photo of the experimental HSS is illustrated in Figure 13. In the Experimental system, the two cylinders are connected to represent hydraulic symmetric linear actuator. The used pump in hardware implementation is axial piston pump swash plate type with variable flow rate pump (A10VSO) (Mannesmann Rexroth [27]).The utilized nominal oil pressure is 10 MPa and the oil pump (A10VSO) is driven by a three phase electrical motor 5.5 kW at 1500 rpm. The measured system consists of one Linear Variable Differential Transformer (LVDT) transducer which has the range of {0 to 500 mm} and is connected to the piston rod, as illustrated in Figure 13. When a 24 V supplies the transducer, it generates a signal from –10 to 10 V. The measuring signals are acquired by Data Acquisition Card (PCI – NI 6014) from National Instruments [28] and then they are sent to the HP-PC with 2.71 GHZ processor, 2 GB RAM, and operating system Windows XPSP3.
Simulation and experimental study of influences of shape of roller on the lubrication performance of precision speed reducer
Published in Engineering Applications of Computational Fluid Mechanics, 2020
Xingqiao Deng, Shisong Wang, Linmao Qian, Yucheng Liu
During the lubrication process, the oil pressure will be generated due to the resistance that the oil must overcome in the lubrication lines to reach the lubricated components. Such a pressure will lead to a power loss. The pressure distribution plot (Figure 9) indicates that maximum lubricant pressure occurs at the bottom of the gearbox for both types of rollers. It is thus expected that a certain amount of power loss will occur at those places, and this amount is positively related to the maximum oil pressure. It also needs to be mentioned that in a gearbox, the maximum pressure should not occur at the oil sump during operation but will appear at the tooth flanks.