The oil mixing loss of the gearbox mainly comes from the friction loss between the lubricating oil and the internal components of the gearbox. The influencing factors of the oil mixing loss mainly include the viscosity of the lubricating oil, the input speed, the operating temperature, the gear helix angle and the gear immersion depth.
The calculation formula of oil mixing loss applicable to high speed given by British standard AGMA ISO14179-1 is adopted. Oil mixing loss includes three parts: oil mixing loss related to the outer diameter of optical shaft (such as shaft); Oil mixing loss related to the smooth surface of the disc (such as the two sides of the gear); Oil mixing loss related to the tooth surface (such as the cylindrical surface of the big gear and the small gear). The total power Pc of oil mixing loss can be expressed as:
Where: fg – gear immersion factor; V – kinematic viscosity, cSt; Ni – component working speed, r/min; D0 – external diameter of element, mm; L – element length, mm; Ag – configuration constant; B – tooth width, mm; Rf – roughness factor; β— Helical angle of helical gear, when β ＜ At 10 °, β The value is taken as 10 °.