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In recent years, with the development of new technologies and new theories, the research on the theory of elastohydrodynamic lubrication for traction drives has been rapidly developed. Based on the theory of elastohydrodynamic lubrication, the traction drive transmits motion and power through the lubricating oil membranes of two relative rolling elements. The lubricating oil film is subjected to part or all of the load, thereby separating the surfaces of the two opposing rolling elements, and converting the friction between the metal and the metal into Internal friction between oil film molecules with lower shear strength reduces frictional resistance during motion. The surface lubrication of the traction drive cone-cone planetary continuously variable transmission is elastic fluid lubrication, and the transmission component is point contact, which can be summarized as the elastic fluid lubrication problem in the elliptical contact area.
In order to drive the vibration exciter of a vibration furnace grate of a boiler plant, the author developed a cone-cone planetary continuously variable transmission. The design parameters are: motor power is 5.5kW. Coal and grate weight 5i. The vibration of the exciter is adjusted between 500 and 550rfoin according to the vibration of the grate. The vibration of the exciter is intermittent, and the boiler is continuously operated for 24 hours after each vibration for 30s. Firstly, according to the simplified method of calculating the film thickness of lubricating oil film proposed by Hamrock and Dawson, the elastic fluid dynamic pressure lubrication design of the transmission element of the cone-cone planetary continuously variable transmission is proposed. Then, the equivalent curvature of the moving direction of each transmission element is derived. The calculation formula of the radius P, the equivalent curvature radius P of the vertical motion direction and the rolling speed u of the moving direction; finally, according to the calculation result, the central oil of the contact area of ​​each force point of the transmission component is obtained as the contact point between the speed regulation ring and the planetary cone At P, Px=(14+1P1)-1 is at the contact point B of the output disk and the planetary cone P-t=(1P1+1/P1)-1(5) according to the moving direction of each contact point of the transmission element, the equivalent radius of curvature P And the equivalent curvature radius P of the vertical motion direction respectively calculate the contact ellipticity A, 2 dimensionless velocity, load and material parameters of point A, point E, point B, and calculate the parameters of the elastic fluid dynamic pressure lubricant film of each transmission element, that is, each The central oil film thickness hfA, htE, hcB of the contact area of ​​the transmission elements A, E, B, taking the small oil film thickness hAm, hEm, hBmin and film thickness ratio VIII, Ae, Ab, must first calculate the dimensionless speed of each contact point Parameters Ua, Ue, Ub, dimensionless load parameter Wa, dimensionless speed parameter, the rolling speed of each transmission element in point A, point E, point B is as follows: at the contact point of the input disk and the planet cone V, the speed-regulating ring is in contact with the planet cone V Point E is at the contact point B between the output disk and the planet cone V. Non-dimensional load parameter 3 The central oil film thickness, the minimum oil film thickness, and the film thickness of the contact area are the dimensionless central oil film thickness of the contact points of the transmission element. No-transmission component contact area dimensionless central oil film thickness dimension minimum oil film thickness transmission element contact point dimensionless minimum oil film thickness calculation formula for the mineral oil type continuously variable transmission special oil, the oil is based on refined mineral oil Made with additives. The main properties of the Ub series oils are shown in Table 2.
Table 2 Ub series oil main performance Ub series oil appearance light yellow yellow red dark kinematic viscosity (40C) / condensation point c flash point c traction coefficient CVT traction drive oil, must have internal friction resistance, adhesion performance Well, the formed oil film can be firmly attached to the metal surface of the transmission component, and the traction coefficient is large. Ub1 continuously variable transmission oil of Guangzhou Mechanical Science Research Institute (formerly Guangzhou Machine Tool Research Institute), the traction coefficient is shown in Table 3.
Table 3 Ub1 continuously variable transmission oil traction coefficient load N friction factor by comparison The author selected Ub1 continuously variable transmission oil.
5 Conclusion The vibrating grate exciter is driven by the developed cone-cone planetary continuously variable transmission. When the output speed of the transmission is adjusted to 530rmin, the vibration requirements of the grate are fully satisfied.
According to the calculated formulas of the equivalent curvature radius P, the vertical motion direction equivalent curvature radius P and the moving direction rolling speed u, the elastic fluid dynamic pressure lubrication design of the transmission elements of the ring cone planetary continuously variable transmission is carried out. The calculation results show that in the middle and low speed sections of the transmission, only when the minimum oil film thickness hBmh and the film thickness ratio Av of the output disk and the planetary cone meet the design requirements, a good elastic fluid dynamic pressure lubrication state between the transmission elements can be ensured.
According to the calculation results, the surface roughness of the input disk, the planetary cone, the speed regulation ring and the output disk which are actually processed reaches 0.1m, and the film thickness ratio satisfies A<10, which basically realizes the minimum wear and the longest life of the transmission component.