Tilt rotor mechanism and mobile rack test system thereof

Abstract

The invention discloses a tilting rotor mechanism and a mobile rack test system thereof, the tilting rotor mechanism comprises a tilting mechanism main support, an electric hydraulic push rod is mounted in the tilting mechanism main support, a motor base is rotatably mounted at the head end of the tilting mechanism main support, and an output shaft of the electric hydraulic push rod is rotatably connected with the bottom of the motor base; the tilting mechanism main support comprises two symmetrically-arranged mechanism side plates, rotating shaft mounting holes are formed in the head ends of the mechanism side plates, a hydraulic cylinder of the electric hydraulic push rod is fixedly mounted on a push rod seat, and meanwhile the front side and the rear side of the push rod seat are rotationally connected to rotating connecting seats. The rotary connecting seat is fixedly mounted on the inner side of the tilting mechanism main bracket; according to the invention, a set of efficient and stable tilting rotor mechanism is designed, and a set of aerodynamic performance data acquisition test bench is designed for the mechanism, so that aerodynamic data of a tilting power system can be accurately acquired, and a data foundation is laid for the design of a tilting rotor aircraft.

Description

Technical Field

[0001] The invention relates to the field of unmanned aerial vehicles, in particular to a tilt-rotor mechanism and a mobile bench test system thereof. Background Art

[0002] The tilt-rotor mechanism was created to solve the problems of short range and slow speed of traditional helicopters and the inability of fixed-wing aircraft to take off and land vertically. It combines the advantages of helicopters and fixed-wing aircraft and can flexibly switch between vertical take-off and landing and horizontal cruising. The core of the tilt-rotor mechanism is that its rotor can be tilted, thereby changing the flight attitude of the aircraft. When the rotor is in a vertical position, the aircraft can take off and land vertically and hover like a helicopter; when the rotor is tilted to a horizontal position, the aircraft can perform high-speed long-distance flight like a fixed-wing aircraft. This design gives the tilt-rotor aircraft the advantages of long range, high speed, and strong maneuverability, and is particularly suitable for tasks such as raids, emergency rescue, and long-distance transportation. The tilt-rotor mechanism realizes the tilting action of the rotor through a complex mechanical structure and control system, thereby changing the flight attitude of the aircraft. This mechanism is precise, reliable, and efficient, and can complete the tilting of the rotor in a short time to adapt to different flight requirements. The design and control of the tilt-rotor mechanism are relatively complex and require precise and reliable mechanical structures and control systems to support it. At the same time, many factors need to be considered, such as the weight and aerodynamic performance of the aircraft.

[0003] The tilt mechanism is the core component of the tiltrotor aircraft, which enables the rotor to switch between the vertical position and the horizontal position. This design enables the tiltrotor aircraft to switch freely between the two flight modes of vertical take-off and landing and high-speed cruising. At present, most of the tilt mechanisms use a servo or motor combined with a screw drive as the tilt power, but both have obvious disadvantages.

[0004] Disadvantages of using servo drive as tilt rotor tilting power: Relatively slow response speed: The tilt mechanism driven by the servo, especially the worm gear drive type, has poor immediacy of the tilt process due to structural limitations. After the servo output rotates through the worm gear, the tilt response speed will be slow, which is not conducive to flexible control of the rotorcraft to switch flight modes. In situations where rapid changes in flight attitude are required, this lag in response speed may become a limiting factor.

[0005] High requirements for the drive device: The tilting servo will generate unbalanced torque during the tilting process, and these torques will be transmitted to the drive device in the opposite direction. This requires the tilting servo to have extremely high body structure and torsional strength, as well as good stability and service life. However, ordinary brands of servos on the market often fail to meet these quality requirements and are prone to failure. This increases the cost of use and maintenance, and may also pose a threat to flight safety.

[0006] Increased control difficulty: Due to the complex structure of the tilting mechanism driven by the servo, its control system is also relatively complex. During flight, the position and speed of the servo need to be precisely controlled to ensure the stability and reliability of the tilt-rotor. This increases the difficulty and complexity of the control system design and may also increase the probability of system failure.

[0007] Limited flight performance: The tilt mechanism driven by the servo may not provide sufficient tilt speed and force, thus limiting the flight performance and flexibility of the aircraft. Especially when high-speed flight or complex maneuvers are required, the tilt mechanism driven by the servo may not meet the requirements.

[0008] Disadvantages of screw mechanical transmission tilt rotor: Low transmission efficiency: When transmitting force and motion, the transmission efficiency of lead screw mechanical transmission is often low due to factors such as friction, wear and deformation. This may result in more energy being consumed to complete the same action during the tilt-rotor process, thereby increasing the energy consumption of the aircraft.

[0009] Limited accuracy: The accuracy of screw mechanical transmission is affected by many factors, such as manufacturing accuracy, assembly accuracy, and wear during use. These factors may cause deviations in the transmission system during actual operation, affecting the stability and control accuracy of the aircraft. In particular, in situations where high-precision control is required, screw mechanical transmission may not meet the requirements.

[0010] High maintenance cost: The screw mechanical transmission system is relatively complex and contains multiple precision components and transmission devices. These components require regular lubrication and maintenance to ensure their normal operation. However, due to the complexity of its structure, the maintenance difficulty may be relatively high, and the maintenance cost is also increased accordingly.

[0011] Weight and space limitations: Screw mechanical transmission systems usually contain multiple components and transmission devices. The weight and space occupied by these components may increase the overall weight and volume of the aircraft. This will not only affect the flight performance and energy consumption of the aircraft, but may also limit the design and manufacturing flexibility of the aircraft. Especially in aircraft with strict requirements on weight and volume, screw mechanical transmission may not be the best choice.

[0012] Reliability issues: Since the lead screw mechanical transmission system contains multiple mechanical components and connection points, these components and connection points may become potential failure points. Under long-term operation or high-load conditions, these components may wear, loosen or break, causing the transmission system to fail or be damaged. This will pose a serious threat to the safety performance of the aircraft.

[0013] Therefore, it is necessary to improve the existing tilting mechanism structure to overcome the above defects. Summary of the invention

[0014] The object of the present invention is to provide a tilt-rotor mechanism and a mobile bench test system thereof to solve the problems raised in the above-mentioned background technology.

[0015] To achieve the above object, the present invention provides the following technical solutions: A tilt rotor mechanism comprises a tilt mechanism main support, an electric hydraulic push rod is installed inside the tilt mechanism main support, a motor base is rotatably installed at the head end of the tilt mechanism main support, and an output shaft of the electric hydraulic push rod is rotatably connected to the bottom of the motor base; The main bracket of the tilting mechanism includes two symmetrically arranged mechanism side plates, the head end of the mechanism side plates is provided with a rotating shaft mounting hole, the hydraulic cylinder of the electric hydraulic push rod is fixedly installed on the push rod seat, and the front and rear sides of the push rod seat are rotatably connected to the rotating connecting seat, and the rotating connecting seat is fixedly installed on the inner side of the main bracket of the tilting mechanism; the second rotating shaft is symmetrically arranged on both sides of the motor base, and the second rotating shaft is rotatably connected to the rotating shaft mounting hole through a second flanged copper sleeve.

[0016] Furthermore, the tail portions of the mechanism side panels are fixed by a first connecting plate, and the middle portions of the two mechanism side panels are fixedly connected by a second connecting plate.

[0017] Furthermore, a plurality of reinforcing ribs arranged perpendicular to each other are integrally formed on the outer side of the mechanism side panel.

[0018] Furthermore, the rotating connection seat is fixedly installed on the inner side of the mechanism side plate, and the front and rear sides of the push rod seat are both extended outward with a first rotating shaft; the first rotating shaft is rotatably connected to the inner side of the rotating connection seat through a first flanged copper sleeve.

[0019] Furthermore, a first flanged copper sleeve mounting hole is provided on the inner side of the rotating connecting seat, and the first flanged copper sleeve is fixedly installed in the first flanged copper sleeve mounting hole.

[0020] Furthermore, a rotatable connecting ear is provided at the bottom of the motor base, and the output shaft of the electric hydraulic push rod is rotatably connected to the rotatable connecting ear through a pin shaft.

[0021] A mobile bench test system for a tilt-rotor mechanism comprises a mobile vehicle, a fixed bench, a data acquisition sensor and a motor propeller power system; the fixed bench is installed on the mobile vehicle and fixed at the rear compartment and the front end of the mobile vehicle, the tilt-rotor mechanism is installed on the fixed bench, and the tilt-rotor mechanism is located at the front upper part of the front of the mobile vehicle, so that the propeller and the mobile vehicle can be prevented from colliding; the data acquisition sensor is connected to the motor base of the tilt-rotor mechanism, and the motor propeller power system is connected to the data acquisition sensor.

[0022] Furthermore, the fixed stand is fixed to the mobile vehicle by bolt connection, the tilt-rotor mechanism is connected to the fixed stand via a tilt-rotor mechanism fixing plate, and the top of the motor base is connected to the data acquisition sensor via bolts.

[0023] Furthermore, the fixed platform includes a main beam, a diagonal beam and a vertical beam. The main beam is located at the top of the mobile vehicle and is arranged along the front and rear directions of the mobile vehicle. The diagonal beam is located at the rear of the main beam, and the rear of the diagonal beam is fixedly connected to the rear car of the mobile vehicle. The vertical beam is located at the bottom front end of the main beam, and the bottom of the vertical beam is fixedly installed at the front end of the mobile vehicle.

[0024] Furthermore, the motor propeller power system includes a propeller, a first connecting flange, a power motor and a second connecting flange; the power motor is connected to the data acquisition sensor through the second connecting flange, and the propeller is connected to the power motor through the first connecting flange.

[0025] Compared with the prior art, the present invention has the following beneficial effects: The tilting mechanism using electric hydraulic cylinder as the tilting force has the characteristics of high precision and high stability, high load-bearing capacity, fast response speed, easy maintenance and strong adaptability.

[0026] The present invention not only designs a set of efficient and stable tilt-rotor mechanism, but also designs a set of aerodynamic performance data acquisition test bench for the mechanism, which can accurately collect aerodynamic data of the tilt-rotor power system and lay a data foundation for the design of the tilt-rotor aircraft. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The figure is a schematic diagram of the structure of a tilt-rotor mechanism.

[0028] Figure 2 It is a front view of a tilt-rotor mechanism.

[0029] Figure 3 A side view of a tilt-rotor mechanism.

[0030] Figure 4 A top view of a tilt-rotor mechanism.

[0031] Figure 5 An exploded view of a tilt-rotor mechanism.

[0032] Figure 6 The figure is a structural schematic diagram of a mobile bench test system for a tilt-rotor mechanism.

[0033] Figure 7 The present invention is a partial structural schematic diagram of a mobile bench test system for a tilt-rotor mechanism.

[0034] Figure 8 The present invention is a schematic diagram of a tilt-rotor mechanism in a mobile bench test system when the tilt-rotor mechanism is in a horizontal direction.

[0035] Fig. 9 The present invention is a schematic diagram of a tilt-rotor mechanism in a mobile bench test system when the tilt-rotor mechanism is in a vertical direction. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0037] See also Figure 1-5 A tilt-rotor mechanism comprises a tilt-rotor mechanism main support 301, An electric hydraulic push rod 302 is installed inside the main support 301 of the tilt mechanism, a motor base 303 is rotatably installed at the head end of the main support 301 of the tilt mechanism, and the output shaft of the electric hydraulic push rod 302 is rotatably connected to the bottom of the motor base 303; The main support 301 of the tilting mechanism comprises two symmetrically arranged mechanism side plates 3011, the head end of each mechanism side plate 3011 is provided with a shaft mounting hole 3014, the tails of the two mechanism side plates 3011 are fixed by a first connecting plate 3012, and the middle parts of the two mechanism side plates 3011 are fixedly connected by a second connecting plate 3015; the outer side of each mechanism side plate 3011 is integrally formed with a plurality of mutually perpendicularly arranged reinforcing ribs 3013; The hydraulic cylinder of the electric hydraulic push rod 302 is fixedly mounted on the push rod seat 3021, and the front and rear sides of the push rod seat 3021 are rotatably connected to the rotating connection seat 3022, and the rotating connection seat 3022 is fixedly mounted on the inner side of the main bracket 301 of the tilt mechanism; Specifically, a first flanging copper sleeve mounting hole 3024 is provided on the inner side of the rotating connection seat 3022, and the first flanging copper sleeve 3025 is fixedly installed in the first flanging copper sleeve mounting hole 3024; The rotating connection seat 3022 is fixedly installed on the inner side of the mechanism side plate 3011, and the front and rear sides of the push rod seat 3021 are both extended outward to be provided with a first rotating shaft 3023; the first rotating shaft 3023 is rotatably connected to the inner side of the rotating connection seat 3022 through a first flanged copper sleeve 3025; The second rotating shaft 3031 is symmetrically arranged on both sides of the motor base 303, and the second rotating shaft 3031 is rotatably connected to the rotating shaft mounting hole 3014 through a second flanged copper sleeve 3032; The bottom of the motor base 303 is provided with a rotating connection ear 3033, and the output shaft of the electric hydraulic push rod 302 is rotatably connected to the rotating connection ear 3033 through a pin shaft 3034; The specific tilting process is as follows: when the system gives a tilting command, the tilting system is tilted by extending or contracting the electric hydraulic push rod 302. When the tilting mechanism is in the horizontal direction, the electric hydraulic push rod 302 extends the output shaft after receiving the tilting command. At this time, the connecting ear of the motor base 303 is pushed by the output shaft, so that the motor base 303 rotates around the second rotating shaft 3031. In theory, the tilting process can be realized at any angle between horizontal and vertical according to the flight requirements of the aircraft. When tilting from the vertical direction to the horizontal direction, the output shaft is contracted, and the tilting purpose can be achieved by using the same steps.

[0038] The pneumatic bench test system usually consists of a test bench, a control system, a data acquisition system, etc. The test bench is used to support and fix the tilt-rotor mechanism to simulate different flight environments and conditions; the control system is used to control the tilt angle and speed of the rotor, as well as the flight attitude of the aircraft; the data acquisition system is used to record and analyze the test data; the system can simulate various flight states and conditions to comprehensively test and evaluate the aerodynamic performance of the tilt-rotor mechanism. Through testing and analysis, the key parameters such as lift, drag, and stability of the tilt-rotor mechanism under different states can be understood, providing an important reference for the design and optimization of the aircraft. The pneumatic bench test system has broad application prospects and important significance in the aviation field. It can provide an important reference for the design and optimization of aircraft, and help scientific researchers understand the performance characteristics and potential problems of aircraft, so as to make targeted improvements and optimizations. In addition, the pneumatic bench test system can also provide important support for the certification and testing of aircraft. By simulating various flight states and conditions, the safety and reliability of the aircraft can be comprehensively evaluated and verified to ensure that it can operate stably and meet various needs in actual applications.

[0039] Most of the current power system test benches can only test the aerodynamic performance of the power system under a single working condition, but are unable to collect aerodynamic performance data for the tilt-rotor mechanism under multiple or complex working conditions.

[0040] Therefore, in this scenario, please refer to Figure 6-9 , a mobile bench test system suitable for collecting aerodynamic performance data of the tilt-rotor mechanism is also designed for the tilt-rotor mechanism, including a mobile vehicle 1, a fixed bench 2, a data collection sensor 4 and a motor propeller power system 5; In this solution, the mobile vehicle 1 serves as the base of the entire test system. For medium and large propeller test benches, the mobile vehicle not only has a large weight to withstand the lift generated by the propeller power system, but can also be moved according to site requirements, which is convenient and fast. The fixed platform 2 is installed on the mobile vehicle 1 and fixed at the rear compartment and the front end of the mobile vehicle 1. The tilt-rotor mechanism 3 is installed on the fixed platform 2. The tilt-rotor mechanism 3 is located at the front upper part of the front of the mobile vehicle 1, so as to avoid the propeller from colliding with the mobile vehicle; the data acquisition sensor 4 is connected to the motor base 303 of the tilt-rotor mechanism 3, and the motor propeller power system 5 is connected to the data acquisition sensor 4; The fixed gantry 2 is fixed to the mobile vehicle by bolt connection, the tilt-rotor mechanism 3 is connected to the fixed gantry 2 via the tilt-rotor mechanism fixing plate 204, and the top of the motor base 303 is connected to the data acquisition sensor 4 via bolts; Specifically, the fixed platform 2 includes a main beam 201, a diagonal beam 202 and a vertical beam 203. The main beam 201 is located at the top of the mobile vehicle 1 and is arranged along the front and rear direction of the mobile vehicle 1. The diagonal beam 202 is located at the rear of the main beam 201, and the rear of the diagonal beam 202 is fixedly connected to the rear compartment of the mobile vehicle 1. The vertical beam 203 is located at the bottom front end of the main beam 201, and the bottom of the vertical beam 203 is fixedly installed at the front end of the mobile vehicle 1. The motor propeller power system 5 includes a propeller 501, a first connecting flange 502, a power motor 503 and a second connecting flange 504; the power motor 503 is connected to the data acquisition sensor 4 through the second connecting flange 504, and the propeller 501 is connected to the power motor 503 through the first connecting flange 502; The specific aerodynamic test process is as follows: the aerodynamic data acquisition of the present invention is mainly realized through the data acquisition sensor 4, which is a DECENT six-dimensional force sensor, and the main data collected are tension and torque; when the aerodynamic data is collected, the lift and torque of the motor propeller system at different positions during the tilting process can be obtained according to the different tilting angles of the power system, which can provide reliable data support for the design of the subsequent flight control system of the aircraft.

[0041] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "left", "right" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed when in use, or the orientation or positional relationship commonly understood by those skilled in the art, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "connection" and the like should be understood in a broad sense, for example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

Claims

1. A tilt-rotor mechanism, characterized in that: It comprises a main support of the tilting mechanism, wherein an electric hydraulic push rod is installed inside the main support of the tilting mechanism, a motor base is rotatably installed at the head end of the main support of the tilting mechanism, and an output shaft of the electric hydraulic push rod is rotatably connected to the bottom of the motor base; The main bracket of the tilting mechanism includes two symmetrically arranged mechanism side plates, the head end of the mechanism side plates is provided with a rotating shaft mounting hole, the hydraulic cylinder of the electric hydraulic push rod is fixedly installed on the push rod seat, and the front and rear sides of the push rod seat are rotatably connected to the rotating connecting seat, and the rotating connecting seat is fixedly installed on the inner side of the main bracket of the tilting mechanism; the second rotating shaft is symmetrically arranged on both sides of the motor base, and the second rotating shaft is rotatably connected to the rotating shaft mounting hole through a second flanged copper sleeve.

2. A tilt-rotor mechanism according to claim 1, characterized in that: The tail portions of the mechanism side plates are fixed together by a first connecting plate, and the middle portions of the two mechanism side plates are fixedly connected by a second connecting plate.

3. A tilt-rotor mechanism according to claim 1, characterized in that: The outer side of the mechanism side plate is integrally formed with a plurality of reinforcing ribs arranged perpendicular to each other.

4. A tilt-rotor mechanism according to claim 1, characterized in that: The rotating connection seat is fixedly installed on the inner side of the mechanism side plate, and the front and rear sides of the push rod seat are both extended outward with a first rotating shaft; the first rotating shaft is rotatably connected to the inner side of the rotating connection seat through a first flanged copper sleeve.

5. A tilt-rotor mechanism according to claim 4, characterized in that: A first flanging copper sleeve mounting hole is arranged on the inner side of the rotating connecting seat, and the first flanging copper sleeve is fixedly mounted in the first flanging copper sleeve mounting hole.

6. A tilt-rotor mechanism according to claim 1, characterized in that: A rotating connection ear is arranged at the bottom of the motor base, and the output shaft of the electric hydraulic push rod is rotatably connected to the rotating connection ear through a pin shaft.

7. A mobile bench test system for a tilt-rotor mechanism, characterized in that: It includes a mobile vehicle, a fixed platform, a data acquisition sensor and a motor propeller power system; the fixed platform is installed on the mobile vehicle and fixed at the rear compartment and the front end of the mobile vehicle, the tilt-rotor mechanism is installed on the fixed platform, and the tilt-rotor mechanism is located in the front upper part of the front of the mobile vehicle, so as to avoid the propeller from colliding with the mobile vehicle; the data acquisition sensor is connected to the motor base of the tilt-rotor mechanism, and the motor propeller power system is connected to the data acquisition sensor.

8. The mobile bench test system for a tilt-rotor mechanism according to claim 7, characterized in that: The fixed platform is fixed to the mobile vehicle by bolt connection, the tilt-rotor mechanism is connected to the fixed platform through a tilt-rotor mechanism fixing plate, and the top of the motor base is connected to the data acquisition sensor through bolts.

9. The mobile bench test system for a tilt-rotor mechanism according to claim 8, characterized in that: The fixed platform includes a main beam, a cable-stayed beam and a vertical beam. The main beam is located at the top of the mobile vehicle and is arranged along the front and rear directions of the mobile vehicle. The cable-stayed beam is located at the rear of the main beam, and the rear of the cable-stayed beam is fixedly connected to the rear compartment of the mobile vehicle. The vertical beam is located at the bottom front end of the main beam, and the bottom of the vertical beam is fixedly installed at the front end of the mobile vehicle.

10. A mobile bench test system for a tilt-rotor mechanism according to claim 9, characterized in that: The motor propeller power system includes a propeller, a first connecting flange, a power motor and a second connecting flange; the power motor is connected to the data acquisition sensor through the second connecting flange, and the propeller is connected to the power motor through the first connecting flange.

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