Fig 1.
Schematic diagram of discrete contact line.
Fig 2.
Calculation program of sliding friction power loss.
Fig 3.
Discrete points on the long axis of contact ellipse.
Fig 4.
Equivalent cylindrical contact.
Fig 5.
Tangent plane coordinates.
Fig 6.
The velocity distribution and friction.
Fig 7.
Kelly Benedict formula calculated value (R = 0.020638m, Ph = 1.0 GPa).
Fig 8.
The calculated values of the improved formula (R = 0.020638m, Ph = 1.0 GPa).
Fig 9.
Comparison between TEHL theory and improved formula.
(a) Normal load density is 1000000N/m; Relative rolling speed is 1.5m/s; Equivalent cylindrical radius is 0.05m. (b) Normal load density is 1000000N/m; Relative rolling speed is 3m/s; Equivalent cylindrical radius is 0.08m.
Table 1.
Gear parameters.
Table 2.
Lubricating oil parameters.
Fig 10.
Normal load, relative sliding velocity and sliding friction coefficient.
(a) Normal load. (b) Relative sliding speed. (c) Sliding friction coefficient.
Fig 11.
Meshing efficiency curve.
Fig 12.
Sliding friction coefficient(U = 3.0 m/s).
Fig 13.
Sliding friction coefficient(W = 1 000 N/mm).
Fig 14.
Average gear meshing efficiency with fixed friction coefficient conditions.
Fig 15.
Average gear meshing efficiency.
Fig 16.
The power loss under the oil-immersed lubrication (T 2 = 19950N·m).
Fig 17.
The power loss under the spray lubrication (T2 = 19950N·m).
Fig 18.
Sliding friction power loss.
Fig 19.
Gear meshing efficiency.
Table 3.
The basic design parameters of the test a gear set.
Fig 20.
Comparison of Measured power losses and theoretical power loss calculation.
(a) Measured power losses from Test 1A repeatability tests at 90°C. (b) Theoretical power loss calculation.
Fig 21.
Comparison of Measured, Eq (6) in Referennce[9] and theoretical power loss calculation.
(a) at 40°C. (b) at 90°C.