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This post was last edited by zhangqi1234 on 2020-4-6 09:16 How to calculate the bearing service life of Danfoss 40 series piston motors? The bearing life of 40 series axial piston motors will be affected by many factors, including: speed, operating pressure, swash plate angle, various external loads on the spindle and the type and viscosity of the fluid. In mechanical vehicle drive applications without external spindle loads, when pump speed, pressure and swashplate angle change frequently, the life of ordinary bearings ß10 (90% undamaged) exceeds the service life of the hydraulic components. In non-driven applications, such as conveyor or fan driven applications, the operating pressure and speed may be kept constant. Duty cycle conditions are completely different from drive applications. It is recommended to consider bearing life when designing the system. The bearing design of the 40 Series Axial Piston Motor motor allows the spindle to withstand occasional radial and axial external loads. However, the total external load on the spindle will shorten the expected bearing life. The maximum allowable radial load of the spindle is related to the load action position, action direction and the working pressure of the hydraulic component. Any external load acting on the spindle will affect the service life of the bearings. For applications where external spindle loads cannot be avoided, controlling the direction value of the load action to 180 degrees can greatly reduce the impact on bearing life. The recommended maximum allowable radial load (Re) is given based on the maximum allowable external torque (Me) and the distance between the point of application and the flange mounting surface (L). The permissible external load requirements given in the table are: Direction of external load action (zero degrees), continuous operating pressure 140 bar (2000 psi), oil injection pressure 20 bar (285 psi), 1800 rpm and bearing life (ß10 2000 hours). Formula for calculating the maximum allowable radial load: Re\u003d Me/L Sustained external radial loads exceeding the recommended maximum allowable loads or known external radial loads when assessing bearing service life, please contact the saao-denfoss-darkin representative office (Elephant Hydraulic Equipment). Long-life bearings are also available as an option. For applications where radial loads cannot be avoided, it is recommended to choose a tapered shaft or dog coupling. Spindle load parameter Re——maximum radial load Me——maximum external moment L——distance from mounting flange to force action point FB——component force (acting on center of gravity) T——thrust recommended maximum external spindle moment——————————M25————M35/44————M46Me N·m •————29 ——25 ———24 External spindle load 40 series axial piston motor external spindle load action direction diagram: