An accessory case transmission efficiency test platform and test method

Abstract

The application discloses an accessory gearbox transmission efficiency test platform and a test method. The test platform comprises: an accessory gearbox to be tested having an input end and a plurality of output ends; a driving device connected to the input end of the accessory gearbox to be tested through a driving shaft; loads connected to the plurality of output ends of the accessory gearbox to be tested; and torque meters arranged at the input end and the output end of the accessory gearbox to be tested, and the input end torque and the output end torque of the accessory gearbox to be tested are measured through the torque meters. The transmission efficiency of the accessory gearbox is tested by reasonably setting the load of the accessory gearbox, and the actual measured value of the whole-machine transmission efficiency of the accessory gearbox is obtained, so that the problem that a single gear test model cannot truly reflect the transmission efficiency of the accessory gearbox is solved. By comparison with theoretical calculation analysis data, an influence factor affecting the transmission efficiency of the accessory gearbox can be obtained. By adjusting the influence factor, the accessory gearbox design is optimized, and then the transmission efficiency of the accessory gearbox is improved, and power loss is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of aero-engine test, and particularly relates to an accessory gearbox transmission efficiency test platform and a test method. BACKGROUND

[0002] The transmission efficiency of a gearbox is affected by the total efficiency of gear meshing, bearing friction loss efficiency, oil stirring loss efficiency, wind resistance loss efficiency and oil seal friction loss efficiency. For a low-speed gearbox, the wind resistance loss efficiency can be ignored, while for an aero gearbox, the wind resistance loss efficiency under high-speed state has a great influence and is closely related to the rotating speed.

[0003] In the prior art, there are methods or devices for simulating the high-speed transmission state of a gearbox or testing the transmission efficiency of a single pair of gears, but for a complex transmission system such as an accessory gearbox with multiple pairs of gear meshing, the technical solution of testing the transmission efficiency of a single pair of gears cannot simulate the real environment, and thus cannot give the transmission efficiency of the whole machine. SUMMARY

[0004] The application aims to provide an accessory gearbox transmission efficiency test platform and a test method to solve or alleviate at least one problem in the background art.

[0005] The technical solution of the application is an accessory gearbox transmission efficiency test platform, which comprises:

[0006] a measured accessory gearbox having an input end and a plurality of output ends;

[0007] a driving device connected to the input end of the measured accessory gearbox through a driving shaft;

[0008] a load connected to the plurality of output ends of the measured accessory gearbox; and

[0009] a torque meter arranged at the input end and the output end of the measured accessory gearbox, and the input end torque and the output end torque of the measured accessory gearbox are measured by the torque meter.

[0010] In an embodiment of the application, the input end of the measured accessory gearbox is connected to the driving shaft of the driving device through a shaft coupling.

[0011] In an embodiment of the application, a gearbox is arranged between the input end of the measured accessory gearbox and the driving shaft of the driving device.

[0012] In an embodiment of the application, the torque meter of the input end of the measured accessory gearbox is arranged on the side close to the measured accessory gearbox.

[0013] The torque meter of the output end of the measured accessory gearbox is arranged on the side away from the measured accessory gearbox.

[0014] In another aspect, the application provides an accessory case transmission efficiency test method, which uses the accessory case transmission efficiency test platform as described in any of the above aspects, and the test method comprises:

[0015] 1) determining the influencing factors of the accessory case transmission efficiency, the influencing factors including the total gear engagement efficiency, bearing friction loss efficiency, oil stirring loss efficiency, wind resistance loss efficiency, and oil seal friction loss efficiency, and determining the control factors of the test platform according to the influencing factors, the control factors being the rotating speed, transmission load, temperature, and cavity pressure;

[0016] 2) setting several typical engine rotating speeds, oil inlet temperatures, cavity pressures, and transmission loads during the test of the accessory case transmission efficiency;

[0017] 3) coupling the several typical engine rotating speeds, oil inlet temperatures, cavity pressures, and transmission loads to obtain the measured value of the accessory case transmission efficiency under all working conditions.

[0018] In an embodiment of the application, the measured value calculation process of the transmission efficiency is as follows:

[0019] Input power = output power + gear engagement loss + bearing friction loss + oil stirring loss + wind resistance loss + oil seal friction loss;

[0020] Transmission efficiency = output power / input power.

[0021] In an embodiment of the application, the several typical engine rotating speeds are realized by adjusting and controlling the driving device;

[0022] The several oil inlet temperatures are realized by adjusting and controlling the oil passage of the measured accessory case;

[0023] The several cavity pressures are realized by adjusting and controlling the air passage of the measured accessory case;

[0024] The several transmission loads are realized by adjusting the load load.

[0025] The test platform and test method provided by the application can test the transmission efficiency of the accessory case, solve the problem that the single-gear test model cannot truly reflect the transmission efficiency of the accessory case, and meanwhile, by comparing with the theoretical calculation and analysis data, the influencing factors of the transmission efficiency of the accessory case can be obtained. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions provided by the application, the following will briefly introduce the drawings. Obviously, the drawings described below are only some embodiments of the application.

[0027] Figure 1Fig. 1 is a schematic diagram of an accessory gearbox transmission efficiency test platform according to an embodiment of the present application. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be described in more detail below with reference to the accompanying drawings of the embodiments of the present application.

[0029] The accessory gearbox transmission efficiency test platform of the present application comprises:

[0030] A driving device is connected to the input end of the measured accessory gearbox through a driving shaft;

[0031] The measured accessory gearbox (which is essentially a gearbox) has several output ends, and the output ends of the measured accessory gearbox are connected to loads; and

[0032] Torque meters are arranged at the input end and the several output ends of the measured accessory gearbox, and the input end torque and the output end torque of the measured accessory gearbox are measured through the torque meters.

[0033] For example, in the embodiment shown in the present application Figure 1 The accessory gearbox transmission efficiency test platform 10 is driven by the driving device 11 on the left, the driving device 11 is connected to the input shaft in the middle of the left side of the measured accessory gearbox 13 through a driving shaft, and the two are connected through a shaft coupling 18, and the rotational speed of the engine is simulated through the driving device 11.

[0034] The measured accessory gearbox 13 provides power for five loads, namely a left hydraulic pump, a right hydraulic pump, a direct current motor, a fuel supercharger and an oil return pump set. The left hydraulic pump, the right hydraulic pump, the direct current motor and the fuel supercharger are driven by the four output shafts of the measured accessory gearbox 13. The measured accessory gearbox 13 has a lubricating oil passage and an air passage (both not shown), the lubricating oil passage is used for lubricating the inside of the measured accessory gearbox 13, the air passage is used for adjusting the cavity pressure of the inside of the measured accessory gearbox 13, and the oil return pump set provides pressure for the lubricating oil in the lubricating oil passage.

[0035] The torque meter includes an input torque meter and output torques on the five loads, the input torque meter is located on the input shaft, and the output torque meter includes a left hydraulic pump torque meter, a right hydraulic pump torque meter, a direct current motor torque meter, a fuel supercharger torque meter and an oil return pump torque meter (not shown), and the input torque meter is arranged at the input end of the measured accessory gearbox 13.

[0036] In the preferred embodiment of the present application, the input torque meter is located near one end of the measured accessory gearbox 13, i.e. the rear end of the shaft coupling 18, and the output torque meter is located away from the other end of the measured accessory gearbox 13, i.e. the rear end of the shaft coupling where the measured accessory gearbox 13 is connected to other load shafts.

[0037] In the present application, a gearbox 12 can be arranged between the driving device 11 and the input shaft of the accessory case 13 to be tested, and the driving speed of the driving device 11 is adjusted through the gearbox 12.

[0038] The present application tests the transmission efficiency of the accessory case to be tested based on the above-mentioned accessory case transmission efficiency test platform. The test method comprises the following steps:

[0039] 1) Determine the influencing factors of the transmission efficiency of the accessory case, which include the total gear engagement efficiency, bearing friction loss efficiency, oil stirring loss efficiency, wind resistance loss efficiency, and oil seal friction loss efficiency. According to the influencing factors, the control factors of the test platform are determined, which are the rotating speed, transmission load, temperature, and cavity pressure.

[0040] Firstly, by analyzing the influencing factors of the transmission efficiency of the accessory case, it is determined that the transmission efficiency is affected by the total gear engagement efficiency, bearing friction loss efficiency, oil stirring loss efficiency, wind resistance loss efficiency, and oil seal friction loss efficiency. The above influencing factors are mainly simulated and adjusted through the control factors such as rotating speed, transmission load, temperature, and cavity pressure.

[0041] 2) During the transmission efficiency test, several typical engine rotating speeds (adjusted and controlled by the driving device 11), oil inlet temperatures (adjusted and controlled by the oil passage of the accessory case to be tested), cavity pressures (adjusted and controlled by the air passage of the accessory case to be tested), and different transmission loads are set.

[0042] For example, in an embodiment of the present application, three typical engine rotating speeds are set, i.e. slow speed, design point, and maximum rotating speed, two oil inlet temperatures are set, five transmission accessories are set, a total of eight transmission loads are set, and two cavity pressures are set.

[0043] 3) The above several conditions are coupled to obtain the actual measured value of the transmission efficiency of the accessory case under full working conditions.

[0044] The actual measured value of the transmission efficiency is:

[0045] Input power = output power + gear engagement loss + bearing friction loss + oil stirring loss + wind resistance loss + oil seal friction loss

[0046] Transmission efficiency = output power / input power

[0047] 4) By adjusting different parameters, the main and secondary factors affecting the transmission efficiency can be found out.

[0048] By reasonably setting the accessory gearbox load, the transmission efficiency test of the accessory gearbox is carried out, the actual measured value of the whole machine level transmission efficiency of the accessory gearbox is obtained, and the problem that the single pair of gear test model cannot truly reflect the transmission efficiency of the accessory gearbox is solved. By comparing with the theoretical calculation analysis data, the influence factor affecting the transmission efficiency of the accessory gearbox can be obtained. By adjusting the influence factor, the accessory gearbox design is optimized, and then the transmission efficiency of the accessory gearbox is improved, and the power loss is reduced.

[0049] The test method provided in the application greatly improves the accuracy compared with the method of simulating and calculating the whole machine level transmission efficiency through a single pair of gears.

[0050] The above is only a specific embodiment of the application, but the protection scope of the application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the application, which should be covered within the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A test method based on an accessory housing transmission efficiency test platform, characterized in that, The testing platform includes: A housing for the accessory under test, which has input terminals and several output terminals; A drive unit, which is connected to the input end of the test accessory housing via a drive shaft; The load connected to several output terminals of the accessory chassis under test; and A torque meter is installed at the input and output ends of the accessory housing under test, and the torque meter measures the input torque and output torque of the accessory housing under test. The testing method includes: 1) Determine the influencing factors of the transmission efficiency of the accessory casing. The influencing factors include the overall gear meshing efficiency, bearing friction loss efficiency, oil churning loss efficiency, wind resistance loss efficiency, and oil seal friction loss efficiency. Based on the influencing factors, determine the control factors of the test platform. The control factors are rotational speed, transmission load, temperature, and cavity pressure. 2) When testing the transmission efficiency of the accessory housing, several typical engine speeds, oil inlet temperatures, chamber pressures, and transmission loads were set. 3) Couple several typical engine speeds, inlet oil temperatures, chamber pressures, and transmission load conditions to obtain the measured value of the accessory gearbox's transmission efficiency under all operating conditions. The calculation process for the measured transmission efficiency value is as follows: Input power = Output power + Gear meshing loss + Bearing friction loss + Oil churning loss + Wind resistance loss + Oil seal friction loss; Transmission efficiency = Output power / Input power.

2. The test method based on the accessory housing transmission efficiency test platform as described in claim 1, characterized in that, The input end of the accessory housing under test is connected to the drive shaft of the drive device via a coupling.

3. The test method based on the accessory housing transmission efficiency test platform as described in claim 1, characterized in that, A gearbox is provided between the input end of the accessory housing under test and the drive shaft of the drive device.

4. The test method based on the accessory housing transmission efficiency test platform as described in claim 1, characterized in that, The torque meter at the input end of the accessory housing under test is located on the side close to the accessory housing under test; The torque meter at the output end of the accessory casing under test is located on the side away from the accessory casing under test.

5. The test method based on the accessory housing transmission efficiency test platform as described in claim 1, characterized in that, Several typical engine speeds are achieved through adjustment and control of the drive unit; Several oil inlet temperatures are achieved by adjusting and controlling the lubricating oil passage of the tested accessory casing; Several chamber pressures are achieved by adjusting and controlling the ventilation path of the test accessory casing; Several types of transmission loads are achieved by adjusting the load load.

Images