Experimental Discussion on Oil Loss in Gear Operating Procedure
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The test carried out two projects: two large gears of the gearbox, the oil tanking test, the box structure such as a; the gearbox single large gear oil mixing test, the tank structure during the test, such as b. In order to study the oil loss and speed, The law of oil temperature and static immersion depth is first carried out by double gear oil mixing test, and the gear box is hung low. In the double gear test, the non-linearity of the oil loss with the rotation speed was not fully reflected (maximum speed 2300r/min). Later, a small gearbox was connected in series to increase the maximum input speed to 3800r/min, and the single gear oil mixing test was performed.
In this test, the static oil immersion depth (abbreviated as immersion depth), oil temperature and input speed of the gearbox large gear are set as independent variables, and the output power (oil loss) is a function. The test conducted under one dipping depth is counted as one test.
The entire test was carried out by dipping depth: 10 mm, 20 mm, 30 mm, 40 mm. The test oil temperature starts from 30 to 90 (the oil viscosity does not differ much when it is above 90), taking 30, 40, 50, 60, 70 and 906 points. Perform a full speed test for each oil temperature range, that is, the input speed range is from 600r/min up to the maximum speed of 3800r/min, and the torque and speed are recorded at intervals of 100r/min. The torque value of each stable speed point was measured with a torque meter, and 6 data were recorded for each measurement point.
The test data processing and the result analysis test collected more than 6000 data, and collected 6 data for each speed for averaging. The value of the oil loss measured in the double gear oil mixing test was counted into 4 bearings (2 ball bearings 2 Loss of the roller bearing and the meshing loss of the two gears; in the single gear oiling test, the loss of two bearings (one ball bearing and one roller bearing) was included. The calculation formula of the gear input power is P=Tn9550, where T is the input torque and n is the input speed.
The test data is processed by EXCEL software, and the EXCEL software can convert the table data into an image for display. Using the test data, the relationship between loss power and speed, loss power and immersion depth, and loss power and oil temperature are given, as well as the temperature fluctuation curves for each test.
Single gear oil loss data analysis (including bearing loss) fixed gear oil immersion depth, oil temperature is independent variable at the fixed oil immersion depth, it can be seen that the power loss at each speed decreases linearly with increasing temperature The trend is that the power drop is not obvious when it is below 3000r/min, and it drops obviously when it is above 3000r/min. According to the test results, the results of the test from any one dipping depth can be seen, the effect of temperature (representing oil viscosity) on power loss. Not large, the amount of change does not exceed 1kW, so the correction factor can be used to explain the degree of influence of oil temperature on power loss.
The fixed temperature value, with the dip depth as the independent variable in the case of fixed oil temperature, it can be seen that when the rotation speed is lower than 2000r/min, the power loss increases linearly with the increase of the immersion depth, but the increase is not large, generally The power loss and the immersion depth are nonlinear when the rotational speed is higher than 2000r/min. The higher the rotational speed, the larger the curvature of the curve. At 3800r/min, the difference between the 10mm immersion depth and the 40mm deep immersion oil loss is more than 3kW. Fixed dip depth, the rotation speed is the independent variable in the case of fixed depth of dipping. It can be seen that the power and the rotational speed are nonlinear, and the best fitting curve is a cubic polynomial. The power loss curve at each temperature is dense, indicating Temperature has little effect on power loss.
40mm immersion depth power loss at various speeds and oil temperature relationship 40 at each speed power loss and immersion depth relationship 40mm deepening power loss and speed at each temperature 3.2 analysis of two large gear oil test results (including gear meshing Loss and bearing loss) The relationship between power and speed is fixed at 40mm immersion depth, and the temperature is independent. Under the condition of fixed immersion depth, it can be seen that the power loss at each speed decreases linearly, below 1500r/min. The power loss decreases by about 0.2 kW, and the power loss decreases by more than 1500 r/min.
The law is the same as that of the single gear oil mixing test at low speed, indicating that the oil temperature has little effect on the power loss of the stirring oil at low speeds (below 1500r/min).
When the temperature is kept constant, it can be seen that the power loss at each speed increases linearly in the 10mm40mm section, and the increase is not large. When the immersion depth reaches 50mm, the loss rises sharply. Both the large gears and the four pinions in the box are stirred.
The relationship between the power loss and the oil temperature at each speed of 40mm immersion depth is 70. The relationship between the power loss and the immersion depth at each speed is fixed. The rotation speed is the independent variable. In the case of fixed depth, it can be seen from 0 that the power is The rotational speed is nonlinear, and the best-fit curve is a cubic polynomial (Fig. 7). The power loss curves at various temperatures are dense, indicating that temperature has little effect on power loss.
Experimental study conclusions: In the case of a certain static immersion depth, the power loss of the stirring oil is in a cubic relationship with the input speed; in the case of a certain speed, the power loss and the immersion depth are in a cubic relationship; 0 immersion depth 10 mm at each temperature The relationship between loss and speed In the three influencing factors of oil temperature, speed and immersion depth, oil temperature change has little effect on the power loss of the oil (30110), and the speed has the greatest influence on the power loss; when the immersion depth is constant, the low speed (2000r/min or less), the power loss is linear with the immersion depth, and the loss value is small; the power loss is linear with the rotation speed.
The single large gear oil loss is not a simple addition relationship compared to the two large gear oil loss.
When the oil is stirred, the input speed of the gearbox is 2000r/min, the static immersion depth is 30mm, the oil temperature is 30, the power loss of the oil measured in the double gear oil mixing test is 1.667 kW, and the large gear speed on the drive shaft is 2000r/min, the large gear speed on the passive shaft is 1318r/min; under the same conditions, the power loss value is 0.79kW when the single gear oil input speed is 1318r/min; the power loss value when the input speed is 2000r/min. It is 1.514 kW. From the above values, the double gear oil loss cannot be simply summed with the single gear oil data.
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