A starter output shaft overrunning rotary test bench with attitude function

Abstract

This invention belongs to the field of power system technology and relates to a starter output shaft overrunning rotation test bench with attitude function. It includes an output shaft overrunning rotation drive system, a lubricating oil filling system, an attitude system, and a measurement and control system. The output shaft overrunning rotation drive system is connected to the starter and drives the starter's output shaft to rotate at high speed, with adjustable speed, and maintains stability at a specified speed. The lubricating oil filling system is connected to the starter and provides lubricating oil at a specified temperature and flow rate. The attitude system is equipped with the starter and the output shaft overrunning rotation drive system, providing the starter with attitude conditions at a specified angle. The measurement and control system is connected to the output shaft overrunning rotation drive system, the lubricating oil filling system, the attitude system, and the starter, controlling these systems to ensure reliable operation according to the test procedure and to collect starter test data.

Description

Technical Field

[0001] This invention belongs to the field of power system technology and relates to a starter output shaft overrunning rotation test bench with attitude function. Background Technology

[0002] An air turbine starter is a commonly used aircraft engine starting device, primarily used for ground starting, cold running, dummy starting, and in-flight auxiliary starting of the engine. Its working principle is as follows: When starting the engine, compressed gas at a certain pressure and temperature enters the starter, driving the turbine. The expansion of the compressed gas performs work, generating shaft power through the turbine stage expansion. This power is transmitted via a reduction gear system and a clutch, ultimately outputting torque to turn the engine. Once the engine reaches a certain speed, the starter is no longer needed. At this point, the turbine and reducer of the starter are in a stopped state, while the output shaft continues to rotate with the engine; this state is called "output shaft overrunning." In this state, to prevent the turbine and reducer inside the starter from being driven by the engine, a clutch is installed between the reduction gear system and the output shaft. The clutch transmits starting torque to the engine during starting and prevents the engine from driving the starter in reverse when the output shaft overruns. The starter output shaft overrunning test bench is used to conduct various tests on the starter under the condition of output shaft overrunning.

[0003] Existing output shaft overrunning rotation test benches lack attitude adjustment capabilities and can only simulate horizontal orientation. They cannot simulate certain internal working conditions of the starter motor that occur under other orientations, such as the relative level of lubricating oil, the stress on components like bearings, gears, and clutches, and the vibration level of the shaft system. Furthermore, the relationship between the starter motor's heat generation level, sealing capacity, internal oil pump supply capacity, and the lifespan of various components under output shaft overrunning rotation conditions and the starter motor's orientation cannot be clearly verified using a horizontal orientation output shaft overrunning rotation test bench. Summary of the Invention

[0004] The purpose of this invention is to propose a starter output shaft overrunning rotary test bench with attitude function to solve the problems existing in the prior art.

[0005] Technical solution:

[0006] A starter output shaft overrunning rotation test bench with attitude function includes an output shaft overrunning rotation drive system, a lubricating oil filling system, an attitude system, and a measurement and control system;

[0007] The output shaft is connected to the overrunning rotation drive system, which drives the output shaft of the starter to rotate at high speed. The speed is adjustable and remains stable at a specified speed.

[0008] The lubricating oil filling system is connected to the starter motor and provides the starter motor with lubricating oil at a specified temperature and flow rate;

[0009] The attitude system is equipped with a starter and an output shaft override rotary drive system to provide the starter with attitude conditions at a specified angle.

[0010] The measurement and control system is connected to the output shaft overrunning rotation drive system, the lubricating oil filling system, the attitude system, and the starter, respectively. It controls the output shaft overrunning rotation drive system, the lubricating oil filling system, and the attitude system to ensure that each system can operate reliably according to the test procedure and to collect starter test data.

[0011] Furthermore, the output shaft overrunning rotation drive device consists of a high-speed electric spindle, an oil-air lubricator, a cooling device, and a base. The base is provided with a mounting base for mounting the high-speed electric spindle. The high-speed electric spindle is mounted on the mounting base. The output shaft of the high-speed electric spindle is connected to the output shaft of the starter via a coupling. The high-speed electric spindle provides the rotational speed required for the test. The oil-air lubricator is connected to the high-speed electric spindle and provides oil mist lubrication for the high-speed electric spindle. The cooling device is connected to the high-speed electric spindle and controls the operating temperature of the high-speed electric spindle through cooling water.

[0012] Furthermore, the base is provided with a first mounting stop, and the mounting base is provided with a second mounting stop. The starter is installed in the first mounting stop, and the high-speed electric spindle is installed in the second mounting stop. The first and second mounting stops are coaxially arranged to ensure the coaxiality of the starter and the high-speed electric spindle, so that the vibration of the starter output shaft is small when it rotates and the operation is smooth.

[0013] Furthermore, the base has reinforcing ribs on its sides and bolt holes at the bottom for connection with the attitude system.

[0014] Furthermore, the lubricating oil filling system includes three identical oil circuits, each comprising an oil tank, an oil supply pump, a flow meter, an oil supply filter, a return oil filter, a return oil pump, and a bypass valve. The flow meter is connected to the oil supply filter via a regulating valve, the oil supply filter is connected to the oil supply pump, the oil supply pump is connected to the oil tank outlet via a valve, and the oil tank inlet is sequentially connected to the return oil filter and the return oil pump. One end of the bypass valve is connected to the oil supply filter outlet, and the other end is connected to the oil tank. The flow meter is connected to the starter motor inlet via a pipeline heater, and the starter motor outlet is connected to the return oil pump via a radiator.

[0015] Furthermore, a temperature sensor and a pressure sensor are installed on the pipeline connecting the pipeline heater and the starter oil inlet; an oil outlet is installed on the pipeline connecting the pipeline heater and the starter oil inlet, an oil outlet is installed on the pipeline connecting the starter oil outlet and the radiator, and a temperature sensor is installed on the pipeline connecting the starter oil outlet and the radiator.

[0016] Furthermore, the attitude system includes an upper platform, an upper hinge, a cross axis, servo electric cylinders, a lower hinge, and a support. There are two servo electric cylinders, with their bottom ends hinged to the lower end of the support via the lower hinge. The cross axis includes a roll axis and a pitch axis.

[0017] The upper platform is provided with two symmetrical mounting lugs at the bottom. The two mounting lugs are respectively connected to the two ends of the roll shaft. The roll shaft is connected to the lead screw of one of the servo electric cylinders through the upper hinge. The lead screw of the other servo electric cylinder is connected to the bottom of the upper platform.

[0018] The top of the bracket is provided with two symmetrical mounting lugs, the pitch axis passes vertically through the roll axis, and the two mounting lugs are respectively connected to the two ends of the pitch axis;

[0019] Two sets of servo electric cylinders are used to enable the upper platform to swing in two degrees of freedom: pitch and roll.

[0020] Furthermore, the measurement and control system calculates the motion of the servo electric cylinder in real time and generates control commands. These control commands are output by the embedded controller after signal conditioning to drive the servo system to achieve the desired motion posture.

[0021] The measurement and control system includes an attitude control module, which comprises a user computer, an embedded controller, a signal conditioning unit, and a drive system that are electrically connected in sequence. The user inputs control commands to the computer, the embedded controller completes signal acquisition and output of control quantities, and the signal is output to the drive system via the signal conditioning unit. The drive system internally implements the control of the current loop, speed loop, and position loop, and finally the electric cylinder is driven by the servo motor to perform displacement movement and control the attitude of the platform.

[0022] Furthermore, the drive system includes a servo drive module, a servo motor, a servo electric cylinder, and an angle encoder. The servo drive module receives the output signal from the signal conditioning unit, and the angle encoder collects the servo motor speed and feeds it back to the servo drive module.

[0023] Beneficial effects:

[0024] This invention provides a starter output shaft overrunning rotation test bench with attitude control function, mainly composed of four parts: an output shaft overrunning rotation drive system, a lubricating oil filling system, an attitude system, and a measurement and control system. The output shaft overrunning rotation drive system is used to drive the output shaft of the starter; the lubricating oil filling system provides the starter with lubricating oil at a specified temperature and flow rate; the attitude system is used to adjust the attitude of the starter; and the measurement and control system controls each controlled component of the test bench to ensure that the entire system operates reliably according to the test procedure.

[0025] The output shaft overrunning drive system mainly consists of a base, a mounting base, a high-speed electric spindle, and matching oil-air lubricator and cooling device. The high-speed electric spindle provides the required rotational speed for the test, the oil-air lubricator provides oil mist lubrication for the high-speed electric spindle, the cooling device controls the operating temperature of the high-speed electric spindle, and the mounting base ensures the coaxiality of the starter and the high-speed electric spindle, resulting in minimal vibration and smooth operation when the starter output shaft overruns.

[0026] The lubricating oil filling system consists of three oil circuits, each carrying a different lubricating oil medium. The entire system can quickly switch between the three media. Each circuit includes an oil tank, a supply pump, a return pump, a circulation pump, a filter, and valves. The supply pump fills the starter motor with lubricating oil, the return pump draws the lubricating oil from the starter motor back to the tank, and the valves regulate the flow rate. The three lubricating oil circuits converge into a pipeline heater, with only one circuit connected to the heater at a time. The lubricating oil filling system uses the pipeline heater and a matching SCR controller to control the lubricating oil temperature.

[0027] The attitude system is used to adjust the attitude of the starter output shaft during overrunning tests. It mainly consists of an upper platform, upper and lower hinges, a cross shaft, a bracket, and two sets of servo electric cylinders, among which the servo electric cylinders are the key components for attitude control. The electric cylinders use a feedback control method based on displacement sensors to achieve high-precision attitude control.

[0028] The measurement and control system is used to control the entire test bench, enabling it to operate according to the specified test procedures. The system mainly includes a host computer, frequency converter, embedded controller, servo control unit, signal conditioning unit, and control system software. The parameters acquired and controlled mainly include electric spindle speed, lubricating oil pressure, lubricating oil flow rate, lubricating oil temperature, platform pitch angle, and platform roll angle. The system calculates the actuator motion in real-time (kinematic position feedback) and generates control commands. These commands are then output by the servo control unit after signal conditioning, driving the servo system to achieve the desired motion posture. Simultaneously, the servo control unit acquires the actuator's displacement, velocity, and other parameters in real time, enabling platform monitoring and protection. Attached Figure Description

[0029] Figure 1 This is an overall structural diagram of the test bench described in this invention;

[0030] Among them, 1-output shaft overrunning rotary drive system, 2-attitude system, 3-starter;

[0031] Figure 2 This is a schematic diagram of the output shaft overrunning rotation drive system described in this invention;

[0032] Among them, 4-base, 5-mounting base, 6-high-speed electric spindle;

[0033] Figure 3 This is a schematic diagram of the lubricating oil filling system described in this invention;

[0034] 7-Return oil pump, 8-Bypass valve, 9-Pipeline heater, 10-Radiator, 11-Temperature sensor, 12-Pressure sensor, 13-Oil inlet, 14-Oil tank, 15-Oil supply pump, 16-Flow meter, 17-Oil supply filter, 18-Regulating valve, 19-Return oil filter.

[0035] Figure 4 This is a structural diagram of the attitude system of the present invention;

[0036] 20-Upper platform, 21-Upper hinge, 22-Cross shaft, 23-Servo electric cylinder, 24-Lower hinge, 25-Bracket;

[0037] Figure 5 This is a logic block diagram of the attitude control system of the present invention. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] The purpose of this invention is to provide a starter output shaft overrunning rotation test bench with attitude control function to solve the problems existing in the prior art. It mainly achieves the purpose of simulating starter 3 output shaft overrunning rotation tests under different attitude conditions by integrating an output shaft overrunning rotation drive system 1, a lubricating oil filling system, an attitude system 2, and a measurement and control system. To make the above-mentioned objectives, features, and advantages of this invention more apparent and understandable, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] like Figure 1 As shown, the operation of this invention relies on four parts: an output shaft overrunning rotation drive system 1, a lubricating oil filling system, an attitude system 2, and a measurement and control system. The output shaft overrunning rotation drive system 1 is entirely mounted on the platform of the attitude system 2, which is fixed to the foundation. The lubricating oil filling system is connected to the starter 3 via a hose and does not move with the attitude system 2. The entire test bench is connected to the measurement and control system via cables and is controlled by the measurement and control system.

[0041] like Figure 2As shown, the output shaft overrunning rotation drive system 1 is used to drive the output shaft of the starter 3 to rotate at high speed. It mainly consists of a base 4, a mounting base 5, a high-speed electric spindle 6, and matching oil-air lubricator and cooling device. The base 4, mounting base 5, and high-speed electric spindle 6 are mounted on the attitude platform together with the starter 3, and move with the platform during the test. The oil-air lubricator and cooling device are connected to the high-speed electric spindle 6 through hoses and do not move with the platform. Compared with a general electric motor 3, the high-speed electric spindle 6 has the characteristics of simple structure, low power, and high speed, which is very suitable for the needs of this invention. The mounting base 5 is mainly used to ensure the coaxiality of the starter 3 and the high-speed electric spindle 6 and control the vibration level when the output shaft of the starter 3 rotates at high speed. The oil-air lubricator is used to atomize lubricating oil to provide lubrication for the bearings of the high-speed electric spindle 6. The oil mist lubrication method is not affected by the attitude, allowing the high-speed electric spindle 6 to move with the platform during the test. The cooling device provides the necessary cooling circulating water for the high-speed electric spindle 6 to ensure the operating temperature of the high-speed electric spindle 6.

[0042] The schematic diagram of the lubricating oil filling system is as follows: Figure 3 As shown. The lubricating oil filling system is used in the simulator's lubricating oil system to provide starter 3 with lubricating oil at a specified flow rate and temperature. The lubricating oil filling system of this invention has three identical oil circuits, which can provide starter 3 with three different grades of lubricating oil to study the effect of different lubricating oils on starter performance. Each of the three oil circuits mainly includes an oil tank 14, an oil supply pump 15, a flow meter 16, an oil supply filter 17, a regulating valve 18, a return oil filter 19, a return oil pump 7, and a bypass valve 8, ultimately converging into a pipeline heater 9, which is then connected to starter 3 via a hose. The outlet of starter 3 is connected to a radiator 10, and then to the return oil pump 7. A temperature sensor 11, a pressure sensor 12, and an oil outlet 13 are installed on the oil inlet pipe. During the test, the lubricating oil filling system does not move with the platform. The lubricating oil filling system controls the temperature of the lubricating oil through a pipeline heater 9, and supplies the starter 3 with a specified flow rate of lubricating oil via an oil supply pump 15, a return oil pump 7, a regulating valve 18, and a bypass valve 8. The drive motor of the oil supply pump 15 is a variable frequency motor, which can adjust the pump's output displacement and, in conjunction with the regulating valve 18, precisely regulates the oil supply pressure. The return oil pump 7 has a displacement more than twice that of the oil supply pump to ensure smooth oil return during starter 3 testing. A 3μm filter is used to ensure that the cleanliness of the lubricating oil in the tank is not inferior to GJB 420B Grade 7. The heating method uses the pipeline heater 9 and its matching silicon controlled rectifier (SCR) controller to regulate the lubricating oil temperature by controlling the power, while ensuring that the lubricating oil is heated only before entering the starter 3, avoiding the influence of high temperatures on other components in the oil circuit.

[0043] like Figure 4As shown, the attitude system mainly consists of an upper platform 20, an upper hinge 21, a cross shaft 22, a servo electric cylinder 23, a lower hinge 24, and a bracket 25. The overall structure has sufficient rigidity to ensure the stable operation of the entire test system without generating additional vibration. The upper platform 20 is welded from Q235 steel plates and profiles. After welding, it undergoes heat treatment to remove stress, ensuring controllable overall deformation. Finally, precision machining ensures the accuracy of the platform surface and other mating dimensions. The platform surface has 100×100mm M10 threaded holes for mounting the output shaft overrunning rotary drive system 1 and the starter 3. The entire attitude system has a load capacity of 500kg.

[0044] When the upper platform 20 performs roll and pitch movements, the force on the servo electric cylinder 23 is the same; therefore, the driving force of the servo electric cylinder 23 only needs to be calculated based on one type of movement. The resistance torque in the movement of the upper platform 21 mainly includes friction torque, inertial torque, and eccentric torque. To ensure reliable system operation, the maximum output torque must not be less than the sum of friction torque, inertial torque, and eccentric torque, and a certain safety margin must be reserved. Considering various factors, this invention selects a safety margin of 1.3, and calculates the thrust of the servo electric cylinder 23 to be 17.5 kN, the stroke to be 500 mm, and the maximum speed to be 250 mm / s.

[0045] The servo control system of attitude system 2 is an important component of the control system of this invention. For example... Figure 5 As shown, the servo control system mainly consists of a user computer, an embedded controller, a signal conditioning unit, and a drive system, from the user end to the controlled component end. The user inputs control commands to the computer, the embedded controller completes signal acquisition and outputs control quantities, and the signal is output to the drive system via the signal conditioning unit (Canopen). The drive system internally implements the control of the current loop, speed loop, and position loop, and finally the servo motor drives the electric cylinder to perform displacement movement, controlling the attitude of the platform.

[0046] In summary, the output shaft overrunning rotation test bench of this invention has an attitude adjustment function, which can not only simulate the horizontal attitude, but also simulate some working conditions inside the starter that occur under other attitude conditions, such as the relative level of lubricating oil, the stress on components such as bearings, gears, and clutches, and the vibration level of the shaft system. At the same time, the relationship between the starter's heat generation level, sealing capacity, oil supply capacity of the internal lubricating pump, and lifespan of various components under the output shaft overrunning rotation condition and the starter's attitude can also be clearly verified by the output shaft overrunning rotation test bench of this invention.

Claims

1. A starter output shaft overrunning rotary test bench with attitude function, characterized in that: This includes the output shaft overrunning rotation drive system, lubricating oil filling system, attitude system, and measurement and control system; The output shaft is connected to the overrunning rotation drive system, which drives the output shaft of the starter to rotate at high speed. The speed is adjustable and remains stable at a specified speed. The lubricating oil filling system is connected to the starter motor and provides the starter motor with lubricating oil at a specified temperature and flow rate; The attitude system is equipped with a starter motor and an output shaft override rotary drive system to provide the starter motor with attitude conditions at a specified angle. The measurement and control system is connected to the output shaft overrunning rotation drive system, the lubricating oil filling system, the attitude system, and the starter, respectively. It controls the output shaft overrunning rotation drive system, the lubricating oil filling system, and the attitude system to ensure that each system can operate reliably according to the test procedure and to collect starter test data.

2. The starter output shaft overrunning rotary test bench with attitude function according to claim 1, characterized in that: The output shaft overrunning rotation drive system consists of a high-speed electric spindle, an oil-air lubricator, a cooling device, and a base. The base is equipped with a mounting base for mounting the high-speed electric spindle. The high-speed electric spindle is mounted on the mounting base. The output shaft of the high-speed electric spindle is connected to the output shaft of the starter via a coupling. The high-speed electric spindle provides the required rotational speed for the test. The oil-air lubricator is connected to the high-speed electric spindle and provides oil mist lubrication. The cooling device is connected to the high-speed electric spindle and controls the operating temperature of the high-speed electric spindle using cooling water.

3. The starter output shaft overrunning rotary test bench with attitude function according to claim 2, characterized in that: The base is provided with mounting stop one, and the mounting base is provided with mounting stop two. The starter is installed in mounting stop one, and the high-speed electric spindle is installed in mounting stop two. Mounting stop one and mounting stop two are set coaxially.

4. A starter output shaft overrunning rotary test bench with attitude function according to claim 2, characterized in that: The base has reinforcing ribs on its sides and bolt holes at the bottom for connecting to the attitude system.

5. A starter output shaft overrunning rotary test bench with attitude function according to claim 1, characterized in that: The lubricating oil filling system includes three identical oil circuits, each comprising an oil tank, an oil supply pump, a flow meter, an oil supply filter, a return oil filter, a return oil pump, and a bypass valve. The flow meter is connected to the oil supply filter via a regulating valve, the oil supply filter is connected to the oil supply pump, the oil supply pump is connected to the oil tank outlet via a valve, and the oil tank inlet is sequentially connected to the return oil filter and the return oil pump. One end of the bypass valve is connected to the oil supply filter outlet, and the other end is connected to the oil tank. The flow meter is connected to the starter motor inlet via a pipeline heater, and the starter motor outlet is connected to the return oil pump via a radiator.

6. A starter output shaft overrunning rotary test bench with attitude function according to claim 5, characterized in that: Temperature and pressure sensors are installed on the pipeline connecting the pipeline heater and the starter oil inlet; an oil outlet is installed on the pipeline connecting the pipeline heater and the starter oil inlet, an oil outlet is installed on the pipeline connecting the starter oil outlet and the radiator, and a temperature sensor is installed on the pipeline connecting the starter oil outlet and the radiator.

7. A starter output shaft overrunning rotary test bench with attitude function according to claim 1, characterized in that: The attitude system includes an upper platform, an upper hinge, a cross axis, servo electric cylinders, a lower hinge, and a support. There are two servo electric cylinders, with their bottom ends hinged to the lower end of the support via the lower hinge. The cross axis includes a roll axis and a pitch axis. The upper platform is provided with two symmetrical mounting lugs at the bottom. The two mounting lugs are respectively connected to the two ends of the roll shaft. The roll shaft is connected to the lead screw of one of the servo electric cylinders through the upper hinge. The lead screw of the other servo electric cylinder is connected to the bottom of the upper platform. The top of the bracket is provided with two symmetrical mounting lugs, the pitch axis passes vertically through the roll axis, and the two mounting lugs are respectively connected to the two ends of the pitch axis; Two sets of servo electric cylinders are used to enable the upper platform to swing in two degrees of freedom: pitch and roll.

8. A starter output shaft overrunning rotary test bench with attitude function according to claim 1, characterized in that: The measurement and control system calculates the motion of the servo electric cylinder in real time and generates control commands. These control commands are output by the embedded controller after signal conditioning to drive the servo system to achieve the desired motion posture. The measurement and control system includes an attitude control module, which comprises a user computer, an embedded controller, a signal conditioning unit, and a drive system that are electrically connected in sequence. The user inputs control commands to the computer, the embedded controller completes signal acquisition and output of control quantities, and the signal is output to the drive system via the signal conditioning unit. The drive system internally implements the control of the current loop, speed loop, and position loop, and finally the electric cylinder is driven by the servo motor to perform displacement movement and control the attitude of the platform.

9. A starter output shaft overrunning rotary test bench with attitude function according to claim 8, characterized in that: The drive system includes a servo drive module, a servo motor, a servo electric cylinder, and an angle encoder. The servo drive module receives the output signal from the signal conditioning unit, and the angle encoder collects the servo motor speed and feeds it back to the servo drive module.

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