A new type of longitudinal double-paddle model helicopter

Abstract

The utility model discloses a novel longitudinal type double-paddle model helicopter, concretely relates to electric toy technical field, including fuselage subassembly and front propeller subassembly and rear propeller subassembly, the front end top of fuselage subassembly is installed with front propeller subassembly, the side of front propeller subassembly is provided with rear propeller subassembly, front propeller subassembly includes front frame subassembly, rear propeller subassembly includes rear frame subassembly, the below of rear frame subassembly is installed with gear box, the inside installation of gear box has the butt joint tooth axle, the front transmission belt is connected through gear box engagement between front frame subassembly and rear frame subassembly, the top of rear frame subassembly is installed with propeller subassembly, propeller subassembly includes double ball head connecting rod, through can reduce the complex transmission loss of commonly used connecting rod mechanism, make the model in the pitch or roll control response speed to accelerate, and the flight precision of model's attitude adjustment can also be adjusted.

Description

Technical Field

[0001] This utility model relates to the field of electric toy technology, and more specifically, to a novel tandem twin-rotor model helicopter. Background Technology

[0002] Early dual-servo designs were primarily used to simplify the complexity of multi-servo systems. Two servos controlled the swashplate's forward / backward and left / right tilt respectively, achieving basic pitch and roll control. However, such designs still relied on mechanical linkages, resulting in low transmission efficiency and response delays.

[0003] A search revealed that publication number CN201419025Y discloses a model helicopter, comprising a main body, a power assembly, a steering mechanism, a tail drive mechanism, an electronic control assembly, a landing gear assembly, a shell, and various fixing components, all fixed to the main body. The steering mechanism includes a main shaft running through the main body, a headstock mounted on the upper end of the main shaft, and a swashplate mounted in the middle of the main shaft. A blade clamp is located at the top of the headstock, securing blades. A balance bar with ailerons fixed at both ends is located in the middle of the headstock, and a steering linkage is fixed at the bottom of the headstock. A steering wheel is fixed inside the swashplate. The steering linkage is connected at both ends to the headstock and the steering wheel, respectively. The power assembly includes a motor, a main motor gear, and a battery. The tail drive mechanism includes a tail motor, a tail drive shaft, a tail motor gear, a tail shaft, a tail gear, and a tail wing. It also includes dual servos and a receiver. It features a simple structure, stable flight, and easy operation. The inventors discovered the following problems with the existing technology during the development of this invention:

[0004] Existing model airplanes require dual power sources to drive the propellers on the front and rear sides during play. This results in excessive mass, directly impacting the flight time. Furthermore, while structural changes are often achieved by directly pushing the rods to create swinging motions, this method often requires multiple rods, necessitating complex power sources.

[0005] Therefore, a new type of tandem twin-rotor model helicopter is proposed to address the above problems. Utility Model Content

[0006] In order to overcome the above-mentioned defects of the prior art, the present invention provides a novel tandem twin-rotor model helicopter to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a novel tandem twin-rotor model helicopter, comprising a fuselage assembly, a front propeller assembly, and a rear propeller assembly. The front propeller assembly is mounted above the front end of the fuselage assembly, and the rear propeller assembly is disposed on the side of the front propeller assembly. The front propeller assembly includes a front frame assembly, and the rear propeller assembly includes a rear frame assembly. A gearbox is mounted below the rear frame assembly, and a mating gear shaft is installed inside the gearbox. A front drive belt meshes between the front frame assembly and the rear frame assembly through the gearbox. The propeller assembly is mounted above the rear frame assembly, and the propeller assembly includes a double ball joint connecting rod.

[0008] Preferably, the propeller body includes a swashplate assembly, an inner swashplate, a main shaft, and a rotor head. The inner swashplate is positioned above the swashplate assembly, and the main shaft is inserted into the center of the swashplate assembly. The rotor head is bolted to the top of the main shaft, and propeller clamp assemblies are mounted on the shaft of the rotor head. The swashplate assembly includes an outer swashplate, a bearing, and an inner swashplate. The bearing is housed inside the outer swashplate, and the outer swashplate is housed inside the bearing. The outer swashplate includes an outer swashplate ball joint, an outer swashplate guide rod, and a shaft hole. The outer swashplate guide rod is positioned between the outer swashplate ball joints. The inner swashplate ball joint is positioned on the upper surface of the inner swashplate. The inclined inner disc ball joint is connected to the propeller clamp via a connecting rod. A disc ball joint is provided on the upper outer diameter surface of the inclined outer disc. A stepped shaft is provided below the inclined outer disc. Double ball joint connecting rods are installed on both sides of the inclined outer disc. The two inclined outer disc ball joints on the left side of the inclined outer disc are respectively connected to the ball joint holes on the double ball joint connecting rods. The other upper ball joint hole of the double ball joint connecting rod is connected to the swing arm ball joint of the left servo assembly. The other two inclined outer disc ball joints on the right side of the inclined outer disc are respectively connected to the ball joint holes on the double ball joint connecting rods. The other upper ball joint hole of the double ball joint connecting rod is connected to the swing arm ball joint of the right servo. The inclined outer disc guide rod is installed in the inclined outer disc guide groove of the servo mounting bracket.

[0009] Preferably, the double ball joint includes a frame, an upper ball joint hole, and a lower ball joint hole. The top of the frame is provided with two sets of upper ball joint holes, and the lower ball joint hole is installed at the end of the frame away from the two sets of upper ball joint holes.

[0010] Preferably, the rear frame assembly further includes a rear frame, a drive motor, a rear transmission belt, and a connecting bottom ring. The rear frame is mounted above the gearbox, the drive motor is installed inside the rear frame, the connecting bottom ring is provided on the side of the drive motor, and the rear transmission belt is sleeved below the connecting bottom ring.

[0011] Preferably, the rear frame assembly further includes a left servo, a right servo, and a servo mounting bracket. The right servo is located on the side of the left servo, and the servo mounting bracket is located on the side of the left servo away from the right servo. The output ends of the left and right servos are respectively connected to the lower ball joint holes of the double ball joint connecting rod. When the left or right servo is driven, the double ball joint connecting rod connected to its output end drives the inclined outer disk to move upward and drives the inclined inner disk to move upward. At this time, the propeller clamp assembly connected to the ball joint of the inclined inner disk rotates along the shaft on the front driven pulley and drives the propeller blade connected to the propeller clamp assembly to rotate along the shaft.

[0012] Preferably, the drive motor includes a power motor, a pulley fixing screw, a rear drive pulley side cover, a connecting piece, a second bearing, a rear drive pulley shaft, a reversing drive gear, and a fourth bearing. The output end of the power motor is equipped with the rear drive pulley side cover. The pulley fixing screw is connected to the internal groove of the rear drive pulley side cover. The bottom end of the rear drive pulley side cover is equipped with a connecting piece. The second bearing is disposed below the connecting piece. The rear drive pulley shaft is inserted into the lower part of the second bearing. The reversing drive gear is mounted on the outer diameter surface of the rear drive pulley shaft, and the fourth bearing is installed inside the reversing drive gear. The rear drive pulley shaft and the reversing drive gear are rotatably connected through the fourth bearing.

[0013] Preferably, the servo mounting bracket includes a servo mounting plate, a housing mounting post, and an inclined outer disk guide groove. The housing mounting posts are installed on both sides of the servo mounting plate, and the inclined outer disk guide groove is installed on the top of the servo mounting plate.

[0014] Preferably, a front driven pulley is installed below the front frame assembly, and a second drive disc is installed below the rear frame assembly.

[0015] Preferably, the mating gear shaft includes a first gear, an inner bearing, a reversing driven gear shaft, an outer bearing, and a front driven pulley ring. The inner bearing is installed inside the first gear, and the reversing driven gear shaft is installed inside the first gear through the inner bearing. The outer bearing is installed on the outer diameter surface of the reversing driven gear shaft, and the front driven pulley ring is installed below the outer bearing.

[0016] The technical effects and advantages of this utility model are as follows:

[0017] 1. Compared with existing technologies, this new type of tandem twin-rotor model helicopter achieves cyclic pitch control of the propeller by controlling the helicopter, especially by using only two servos in each group, which controls the helicopter to fly left or right, and collective pitch control, which controls the helicopter to fly forward or backward, turn left or right, thereby controlling the helicopter's entire flight attitude. This solution significantly simplifies the structure and reduces costs.

[0018] 2. Compared with existing technologies, this new type of tandem twin-rotor model helicopter integrates a drive motor, dual servos, and gearbox in the rear frame assembly. The front and rear propeller assemblies are driven synchronously by the front and rear drive belts. This single power source replaces the dual-power design used in model aircraft, which can directly reduce the weight of the entire aircraft. At the same time, the power transmission speed is improved through gear meshing, thereby extending the flight time of the model aircraft. Attached Figure Description

[0019] Figure 1 This is a side view of the fuselage assembly of this utility model.

[0020] Figure 2 This is an exploded structural diagram of the fuselage components of this utility model.

[0021] Figure 3 This is a schematic diagram of the transmission part of the main body component of this utility model.

[0022] Figure 4 This is a structural schematic diagram of the rear frame assembly of this utility model.

[0023] Figure 5 This is an exploded structural diagram of the rear frame assembly of this utility model.

[0024] Figure 6 This is a schematic diagram of the inclined outer disk of this utility model.

[0025] Figure 7 This is a schematic diagram of the propeller assembly of this utility model.

[0026] Figure 8 This is a schematic diagram of the power output transmission structure of this utility model.

[0027] Figure 9 This is an exploded view of the power output transmission structure of this utility model.

[0028] Figure 10 This is an exploded view of the driven gear of this utility model.

[0029] Figure 11 This is an exploded view of the transmission structure of the power motor of this utility model.

[0030] Figure 12 This is a schematic diagram of the structure of the double ball joint of this utility model.

[0031] Figure 13 This is a schematic diagram of the inclined outer disk of this utility model.

[0032] The attached diagram is labeled as follows: 1. Fuselage assembly; 2. Front propeller assembly; 3. Rear propeller assembly; 4. Front frame assembly; 5. Rear frame assembly; 6. Front drive belt; 7. Gearbox; 8. Rear frame; 9. Drive motor; 901. Power motor; 902. Belt pulley fixing screw; 903. Rear drive pulley side cover; 904. Connecting piece; 905. Second bearing; 906. Rear drive pulley shaft; 907. Directional drive gear; 908. Fourth bearing; 10. Rear drive belt; 11. Connecting bottom ring; 12. Propeller body; 13. Left servo; 14. Right servo; 15. Servo mount; 1501. Servo mount plate; 1502. Fuselage mounting post; 150 3. Inclined outer disk guide groove; 16. Double ball joint connecting rod; 1601. Frame; 1602. Upper ball joint hole; 17. Lower ball joint hole; 18. Inclined outer disk; 1801. Inclined outer disk ball joint; 1802. Inclined outer disk guide rod; 1803. Shaft hole; 19. First bearing; 20. Inclined inner disk; 2001. Disc ball joint; 2002. Stepped shaft; 21. Inclined inner disk ball joint; 22. Main shaft; 23. Rotor head; 24. Paddle clamp assembly; 25. Front driven pulley; 26. Connecting gear shaft; 2601. First gear; 2602. Inner bearing; 2603. Reversing driven gear shaft; 2604. Outer bearing; 2605. Front driven pulley ring; 27. Second drive disk. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Example

[0035] As attached Figures 1 to 13The diagram illustrates a novel tandem twin-rotor model helicopter, comprising a fuselage assembly 1, a front propeller assembly 2, and a rear propeller assembly 3. The front propeller assembly 2 is mounted on the upper front end of the fuselage assembly 1. A power source is released through a rear frame assembly 5, driving the rotors of both the front and rear propeller assemblies 2 and 3 to rotate. The rear propeller assembly 3 is located on the side of the front propeller assembly 2. The front propeller assembly 2 includes a front frame assembly 4, and the rear propeller assembly 3 includes a rear frame assembly 5. A gearbox 7 is mounted below the rear frame assembly 5. The rear frame assembly 5 drives the front frame assembly 4 to rotate via a front drive belt 6 connected to the gearbox 7. A rear drive belt 10 connected to a drive motor 9 and the gearbox 7 drives the rear propeller assembly 3 to rotate. Thus, a single drive source powers both the front and rear propeller assemblies 2 and 3, providing power to the model helicopter. A mating gear shaft 2 is installed inside the gearbox 7. 6. A front drive belt 6 is meshed between the front frame assembly 4 and the rear frame assembly 5 via a gearbox 7. A propeller body 12 is mounted on top of the rear frame assembly 5. The propeller body 12 includes a double ball joint connecting rod 16. The front propeller assembly 2 is mounted on top of the front end of the fuselage assembly 1. The power source is released through the rear frame assembly 5 and drives the propeller bodies of the front propeller assembly 2 and the rear propeller assembly 3 to rotate at the same speed through only one drive motor 9. The rear propeller assembly 3 is located on the side of the front propeller assembly 2. Both are supported by the front frame assembly 4 and the rear frame assembly 5. The gearbox 7 installed below the rear frame assembly 5 drives the front frame assembly 4 to rotate through the front drive belt 6. The drive motor 9 is connected to the gearbox 7 through the rear drive belt 10 to drive the rear propeller assembly 3. This realizes the core design of synchronously driving the front and rear propellers through the drive motor 9.

[0036] In a preferred embodiment, the propeller body 12 includes a swashplate assembly, an inner swashplate 20, a main shaft 22, and a rotor head 23. The inner swashplate 20 is positioned above the swashplate assembly, and the main shaft 22 is inserted into the center of the swashplate assembly. The rotor head 23 is bolted to the top of the main shaft 22. Driven by the servo motor of the corresponding blade, the connected double ball joint rod 16 drives the outer swashplate 18 to move. When the servo motor is activated, the double ball joint rod 16 pulls or pushes the outer swashplate 18, causing it to tilt or translate. The movement of the outer swashplate 18 is transmitted through the inner swashplate 20. The blade is handed over to the blade clamp assembly 24, which ultimately changes the blade pitch. The pitch is the angle between the blade and the plane of rotation. The blade clamp assembly 24 is mounted on the shaft of the rotor head 23. The swashplate assembly includes a swashplate outer disk 18, a first bearing 19, and a swashplate inner disk 20. The first bearing 19 is placed inside the swashplate outer disk 18, and the swashplate inner disk 20 is placed inside the first bearing 19. The swashplate outer disk 18 includes a swashplate outer disk ball joint 1801, a swashplate outer disk guide rod 1802, and a shaft hole 1803. The swashplate outer disk guide rod 1802 is arranged between the swashplate outer disk ball joints 1801. An inclined inner disc ball joint 21 is provided on the upper surface of the inner disc 20. The inclined inner disc 20 and the inclined inner disc ball joint 21 are connected to the propeller clamp via a connecting rod. A disc ball joint 2001 is provided on the upper outer diameter surface of the inclined inner disc 20. A stepped shaft 2002 is provided below the inclined outer disc 18. Double ball joint connecting rods 16 are installed on both sides of the inclined outer disc 18. The two inclined outer disc ball joints 1801 on the left side of the inclined outer disc 18 are respectively connected to the ball joint holes 1602 on the double ball joint connecting rods 16. The ball joint hole at the other end of the double ball joint connecting rods 16 is connected to the ball joint of the swing arm of the left servo 13. The other two inclined outer disk ball joints 1801 on the right side of the inclined outer disk 18 are respectively connected to the ball joint holes on the double ball joint connecting rod 16. The ball joint hole 1602 on the other end of the double ball joint connecting rod 16 is connected to the swing arm ball joint of the right servo 14. The inclined outer disk guide rod 1802 on the inclined outer disk 18 is installed in the inclined outer disk guide groove 1503 of the servo mounting bracket 15. The front propeller assembly 2 and the rear propeller assembly 3 are each equipped with two servos, for a total of four servos. Each propeller group adopts a dual servo control structure, and the periodic pitch and collective pitch control of the propeller are achieved through the cooperation of the dual servos.

[0037] In a preferred embodiment, the double ball joint 16 includes a frame 1601, an upper ball joint hole 1602, and a lower ball joint hole 17. The shape of the frame 1601 is adjustable, but it is specifically connected to the inclined inner disk ball joint 21 of the inclined inner disk 20 through two sets of upper ball joint holes 1602. The lower ball joint hole 17 provided at the bottom of the frame 1601 is connected to the output shaft of the servo motor. The top of the frame 1601 is provided with two sets of upper ball joint holes 1602, and the lower ball joint hole 17 is installed at the end of the frame 1601 away from the two sets of upper ball joint holes 1602. The frame 1601 of the double ball joint 16 is connected to the inclined inner disk ball joint 21 of the inclined inner disk 20 through the upper ball joint hole 1602, while the lower ball joint hole 17 is connected to the output shaft of the servo motor. Therefore, when the servo motor is driven, the double ball joint 16 is driven by the output shaft of the servo motor, thereby adjusting the angle between the blade and the blade clamp assembly 24.

[0038] In a preferred embodiment, the rear frame assembly 5 further includes a rear frame 8, a drive motor 9, a rear transmission belt 10, and a connecting bottom ring 11. The rear frame 8 is mounted on top of the gearbox 7, and the drive motor 9 is installed inside the rear frame 8. The rear frame assembly 5 uses the rear frame 8 to place the drive motor 9, and the output end of the drive motor 9 is inserted into the interior of the gearbox 7. Then, the drive motor 9 is connected to the front driven pulley 25 and the second drive disc 27 of the front propeller assembly 2 and the rear propeller assembly 3 through the meshing front transmission belt 6 and the rear transmission belt 10. A connecting bottom ring 11 is provided on the side of the drive motor 9, and the rear transmission belt 10 is sleeved below the connecting bottom ring 11.

[0039] In a preferred embodiment, the rear frame assembly 5 further includes a left servo motor 13, a right servo motor 14, and a servo motor mounting bracket 15. The left servo motor 13 and right servo motor 14 are two servos controlling the front propeller assembly 2. The right servo motor 14 is located on the side of the left servo motor 13, and the servo motor mounting bracket 15 is located on the side of the left servo motor 13 away from the right servo motor 14. The power source for driving the propeller blades to change pitch is the corresponding dual servo motor. The left servo motor 13 and right servo motor 14 are the two servos controlling the front propeller assembly 2, and the power source for driving the propeller blades to oscillate is the left servo motor 13 and right servo motor 14. The output ends of 14 are connected to the lower ball joint hole 17 of the double ball joint connecting rod 16, and the output ends of the left servo 13 and the right servo 14 are connected to the Z-shaped shaft for connection with the lower ball joint hole 17 of the double ball joint connecting rod 16. When the left servo 13 or the right servo 14 is driven, the double ball joint connecting rod 16 connected to its output end drives the inclined outer disk 18 to move upward and drives the inclined inner disk 20 to move upward. At this time, the propeller clamp assembly 24 connected to the inclined inner disk ball joint 21 on the inclined inner disk 20 rotates along the shaft on the front driven pulley 25 and drives the propeller blade connected to the propeller clamp assembly 24 to rotate along the shaft.

[0040] In a preferred embodiment, the drive motor 9 includes a power motor 901, a pulley fixing screw 902, a rear drive pulley side cover 903, a connecting piece 904, a second bearing 905, a rear drive pulley shaft 906, a reversing drive gear 907, and a fourth bearing 908. The output end of the power motor 901 is equipped with the rear drive pulley side cover 903, which is connected to the rear drive belt 10. The pulley fixing screw 902 is connected to the internal groove of the rear drive pulley side cover 903, and the pulley fixing screw 902 is used for the connecting piece 904 for the upper gear connection. The connecting piece 904 is installed at the bottom end of the rear drive pulley side cover 903, and a section is provided below the connecting piece 904. There is a second bearing 905, which drives the rear drive pulley shaft 906 to rotate. The rear drive pulley shaft 906 is inserted into the lower part of the second bearing 905. The rear drive pulley shaft 906 is used to connect the reversing drive gear 907, which is connected to the front drive belt 6. The rear drive pulley shaft 906 and the reversing drive gear 907 are connected and rotate through the second bearing 905. The reversing drive gear 907 is mounted on the outer diameter surface of the rear drive pulley shaft 906, and a fourth bearing 908 is installed inside the reversing drive gear 907. The rear drive pulley shaft 906 and the reversing drive gear 907 are rotatably connected through the fourth bearing 908.

[0041] In a preferred embodiment, the servo mounting bracket 15 includes a servo mounting plate 1501, a housing mounting post 1502, and an inclined outer disk guide groove 1503. The housing mounting posts 1502 are installed on both sides of the servo mounting plate 1501. The servo mounting plate 1501 is connected to the housing through the housing mounting posts 1502. The inclined structure formed by the structure connected to the inclined outer disk 18 provides guidance and limiting function when tilting or translating. The top of the servo mounting plate 1501 is equipped with an inclined outer disk guide groove 1503. The inclined outer disk guide groove 1503 has a groove at the center of the plate body for connecting with the limiting post of the inclined outer disk 18 and limiting the inclined outer disk 18. This allows the inclined outer disk 18 to slide up and down along the main shaft 22 without rotating in the circumferential direction.

[0042] In a preferred embodiment, a front driven pulley 25 is installed below the front frame assembly 4, and a second drive disc 27 is installed below the rear frame assembly 5.

[0043] In a preferred embodiment, the mating gear shaft 26 includes a first gear 2601, an inner bearing 2602, a reversing driven gear shaft 2603, an outer bearing 2604, and a front driven pulley ring 2605. The inner bearing 2602 is installed inside the first gear 2601, and the reversing driven gear shaft 2603 is installed inside the first gear 2601 through the inner bearing 2602. The outer bearing 2604 is installed on the outer diameter surface of the reversing driven gear shaft 2603, and the front driven pulley ring 2605 is installed below the outer bearing 2604.

[0044] The working process of this utility model is as follows: First, the drive motor 9 is released through the rear frame assembly 5. Through the transmission of the gearbox 7, the front drive belt 6, and the rear drive belt 10, it synchronously drives the propellers of the front propeller assembly 2 and the rear propeller assembly 3 to rotate at the same speed, providing lift and thrust for the model aircraft. Flight control is achieved by manipulating the dual servos of the front propeller assembly 2 and the rear propeller assembly 3. These servos drive the tilting outer disk 18 to move through the double ball joint 16, thereby changing the propeller pitch. When ascending, the drive motor is increased... The rotational speed of the 9th rotational speed causes the drive gearbox 7 to drive the front drive belt 6 and the rear drive belt 10 to increase the rotational speed of the front and rear propellers, thereby increasing lift and causing the helicopter to rise. Conversely, the model aircraft will descend. Then, by adjusting the pitch, the two sets of servos that control the front and rear propellers in the same direction will drive the tilting outer disk 18 to move upward as a whole through the double ball joint 16, thereby increasing the pitch between the propeller clamp assembly 24 and the connected blades to increase lift and cause the model aircraft to rise. When the operation is reversed, the tilting outer disk 18 will move downward as a whole to decrease the pitch, thereby decreasing lift and causing the model aircraft to descend.

[0045] When flying forward or backward, the front propeller assembly 2 and the rear propeller assembly 3 are driven to rotate at the same speed by the same drive motor 9. Then, the dual servo motors of the front propeller assembly 2 are individually controlled to reduce the pitch of the blades connected to the blade clamp assembly 24, thus reducing lift. At the same time, the dual servo motors of the rear propeller are individually controlled to increase the blade pitch, thus increasing lift. The action of the servo motors drives the tilting outer disks 18 in the front propeller assembly 2 and the rear propeller assembly 3 to produce differentiated translational movements through the double ball joints 16. The tilting outer disk 18 of the front propeller assembly 2 moves downward, while the tilting outer disk 18 of the rear propeller assembly 3 moves upward, causing the blades to collectively change pitch. At this time, the lift difference between the front propeller assembly 2 and the rear propeller assembly 3 forms a pitching moment. At this time, the forward lift of the model aircraft is small, and the nose drops, causing the model aircraft to fly forward. Conversely, the pitch of the front propeller increases and the lift increases, while the pitch of the rear propeller decreases and the lift decreases, thus enabling the helicopter to fly backward.

[0046] When left or right flight or lateral flight is required, the left and right servos of the front propeller and the rear propeller move synchronously. Through the double ball joint 16, the tilting outer disk 18 tilts synchronously to the left or right, causing the propeller blades to perform cyclic pitch changes. This tilts the propeller's plane of rotation, generating a lateral force, which in turn changes the lift in the left and right directions, enabling the helicopter to fly left or right. To achieve left or right turns and yaw operations on the model aircraft, the same drive motor 9 drives both the front and rear propellers to rotate at the same speed. The system independently controls the left and right servos of the front propeller to change its collective pitch, and simultaneously controls the servo group of the rear propeller to change its collective pitch. At this time, the servo action drives the front and rear tilting outer disks 18 to produce differentiated translational motion through the double ball joint 16, thereby causing the propeller blades to perform differentiated collective pitch changes. At this time, the propeller speed is the same, but the pitch is different, resulting in different counter torques. When the counter torques of the front and rear propellers are not equal, the model immediately generates a net torque around the vertical axis of the fuselage, realizing the helicopter turning left or right. The above is the working principle of this new type of tandem twin-rotor model helicopter.

Claims

1. A novel tandem twin-rotor model helicopter, comprising a fuselage assembly (1), a front propeller assembly (2), and a rear propeller assembly (3), characterized in that: A front propeller assembly (2) is mounted above the front end of the fuselage assembly (1), and a rear propeller assembly (3) is provided behind the front propeller assembly (2). The front propeller assembly (2) includes a front frame assembly (4), and the rear propeller assembly (3) includes a rear frame assembly (5). A gearbox (7) is mounted below the rear frame assembly (5), and a mating gear shaft (26) is installed inside the gearbox (7). A front drive belt (6) is meshed between the front frame assembly (4) and the rear frame assembly (5) through the gearbox (7). A propeller body (12) is mounted above the rear frame assembly (5), and the propeller body (12) includes a double ball joint connecting rod (16).

2. The novel tandem twin-rotor model helicopter according to claim 1, characterized in that: The propeller body (12) includes a swashplate assembly, an inner swashplate (20), a main shaft (22), and a rotor head (23). The inner swashplate (20) is located above the swashplate assembly, and the main shaft (22) is inserted into the center of the swashplate assembly. The rotor head (23) is bolted to the top of the main shaft (22). The rotor head (23) is mounted on the shaft of the rotor head (23). The propeller clamp assembly (24) is mounted on the shaft of the rotor head (23). The swashplate assembly includes an outer swashplate (18), a first bearing (19), and an inner swashplate (20). The inclined outer disk (18) houses a first bearing (19), and the first bearing (19) houses an inclined inner disk (20). The inclined outer disk (18) includes an inclined outer disk ball head (1801), an inclined outer disk guide rod (1802), and a shaft hole (1803). The inclined outer disk guide rod (1802) is arranged between the inclined outer disk ball heads (1801). An inclined inner disk ball head (21) is arranged on the upper surface of the inclined inner disk (20). The inclined inner disk (20) and the inclined... The inclined inner disc ball joints (21) are connected to the propeller clamp via a connecting rod. A disc ball joint (2001) is provided on the upper outer diameter surface of the inclined inner disc (20). A stepped shaft (2002) is provided below the inclined inner disc (20). Double ball joint connecting rods (16) are respectively installed on both sides of the inclined outer disc (18). The two inclined outer disc ball joints (1801) on the left side of the inclined outer disc (18) are respectively connected to the upper ball joint holes (1602) of the double ball joint connecting rods (16). Another upper ball joint hole (1602) is connected to the ball joint of the left servo (13). The other two ball joints (1801) on the right side of the tilted outer disk (18) are respectively connected to the ball joint holes on the double ball joint connecting rod (16). The other upper ball joint hole (1602) of the double ball joint connecting rod (16) is connected to the ball joint of the right servo (14). The tilted outer disk guide rod (1802) on the tilted outer disk (18) is installed in the tilted outer disk guide groove (1503) of the servo mounting bracket (15).

3. A novel tandem twin-rotor model helicopter according to claim 2, characterized in that: The double ball joint (16) includes a frame (1601), an upper ball joint hole (1602) and a lower ball joint hole (17). The top of the frame (1601) is provided with two sets of upper ball joint holes (1602), and the lower ball joint hole (17) is installed at the end of the frame (1601) away from the two sets of upper ball joint holes (1602).

4. A novel tandem twin-rotor model helicopter according to claim 2, characterized in that: The rear frame assembly (5) also includes a rear frame (8), a drive motor (9), a rear transmission belt (10), and a connecting bottom ring (11). The rear frame (8) is installed above the gearbox (7). The drive motor (9) is installed inside the rear frame (8). The connecting bottom ring (11) is provided on the side of the drive motor (9). The rear transmission belt (10) is sleeved below the connecting bottom ring (11).

5. A novel tandem twin-rotor model helicopter according to claim 1, characterized in that: The rear frame assembly (5) also includes a left servo (13), a right servo (14) and a servo mounting bracket (15). The right servo (14) is provided on the side of the left servo (13). The servo mounting bracket (15) is provided on the side of the left servo (13) away from the right servo (14). The output ends of the left servo (13) and the right servo (14) are respectively connected to the lower ball joint hole (17) of the double ball joint connecting rod (16). When the left servo (13) or the right servo (14) is driven, the double ball joint connecting rod (16) connected to its output end drives the inclined outer disk (18) to move upward and drives the inclined inner disk (20) to move upward. At this time, the propeller clamp assembly (24) connected to the inclined inner disk ball joint (21) on the inclined inner disk (20) rotates along the shaft on the front driven pulley (25) and drives the propeller blade connected to the propeller clamp assembly (24) to rotate along the shaft.

6. A novel tandem twin-rotor model helicopter according to claim 4, characterized in that: The drive motor (9) includes a power motor (901), a pulley fixing screw (902), a rear drive pulley side cover (903), a connecting piece (904), a second bearing (905), a rear drive pulley shaft (906), a reversing drive gear (907), and a fourth bearing (908). The output end of the power motor (901) is equipped with the rear drive pulley side cover (903). The pulley fixing screw (902) is connected to the internal groove of the rear drive pulley side cover (903). A connecting piece (904) is installed at the bottom of the 903. A second bearing (905) is provided below the connecting piece (904). A rear drive pulley shaft (906) is inserted into the lower part of the second bearing (905). A reversing drive gear (907) is installed on the outer diameter surface of the rear drive pulley shaft (906). A fourth bearing (908) is installed inside the reversing drive gear (907). The rear drive pulley shaft (906) and the reversing drive gear (907) are rotatably connected through the fourth bearing (908).

7. A novel tandem twin-rotor model helicopter according to claim 5, characterized in that: The servo mounting bracket (15) includes a servo mounting plate (1501), a housing mounting post (1502), and an inclined outer disk guide groove (1503). The housing mounting posts (1502) are installed on both sides of the servo mounting plate (1501), and the inclined outer disk guide groove (1503) is installed on the top of the servo mounting plate (1501).

8. A novel tandem twin-rotor model helicopter according to claim 1, characterized in that: A front driven pulley (25) is installed below the front frame assembly (4), and a second drive disc (27) is installed below the rear frame assembly (5).

9. A novel tandem twin-rotor model helicopter according to claim 1, characterized in that: The mating gear shaft (26) includes a first gear (2601), an inner bearing (2602), a reversing driven gear shaft (2603), an outer bearing (2604), and a front driven pulley ring (2605). The inner bearing (2602) is installed inside the first gear (2601), and the reversing driven gear shaft (2603) is installed inside the first gear (2601) through the inner bearing (2602). The outer bearing (2604) is installed on the outer diameter surface of the reversing driven gear shaft (2603), and the front driven pulley ring (2605) is installed below the outer bearing (2604).

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