A flying car power unit based on wheel-side motors

Abstract

This invention discloses a power unit for a flying car based on wheel-side motors, belonging to the field of flying cars. This power unit changes the traditional power unit layout of convertible flying cars, integrating the drive motor and reducer onto the frame to form a wheel-side motor drive mode. Power transmission between driving and flight modes is achieved through bidirectional output wheel-side motors and a set of gears that drive the propeller. The wheels and propeller share a hollow support shaft, with inner and outer bearings supporting the rotation of both. A telescopic damping mechanism switches between flight and driving modes and provides vibration damping in driving mode. This invention avoids the structural complexity and high unsprung mass problems associated with integrating drive motors, reducers, and clutches into the wheel system in existing technologies, resulting in a compact structure and low unsprung mass.

Description

Technical Field

[0001] This invention belongs to the field of flying cars, specifically relating to a flying car power unit based on wheel-side motors. Background Technology

[0002] Flying cars, a combination of aircraft and automobiles, are amphibious vehicles that allow for seamless switching between ground driving and aerial flight. As a potential solution to ground traffic congestion and other problems, flying cars hold great promise. However, due to issues such as technological maturity, flying cars have only undergone test flights in a few areas and have not yet reached a large-scale production scale.

[0003] In flying cars, the vehicle's (driving) power unit is basically the same as a regular car engine, while the flight (takeoff, landing, and navigation) power unit is the same as a regular aircraft propulsion system, consisting of a ducted fan or propeller. Currently, flying cars can be divided into two categories based on the configuration of their power units. The first category is independent: In this type, the vehicle's power unit and the flight power unit are independent mechanisms, and the vehicle wheels do not need to change orientation when switching between vehicle and flight modes. However, because the vehicle's power unit and the flight power unit operate independently in independent flying cars, the overall vehicle structure is larger and heavier. The second category is convertible: In this type, the vehicle's power unit and the flight power unit are generally integrated into a single power system (wheel system), and the vehicle wheels change orientation when switching between vehicle and flight modes. Compared to independent flying cars, convertible flying cars have the advantages of smaller overall size and lighter weight. However, from the current design of convertible flying cars, the wheel system generally integrates components such as a drive motor, reducer, and clutch, resulting in a larger unsprung mass and potentially causing problems with handling and stability. Summary of the Invention

[0004] The technical problem to be solved:

[0005] To overcome the shortcomings of existing technologies, this invention provides a power unit for a flying car based on a wheel-side motor, belonging to the category of power units for convertible flying cars. This device eliminates the clutch, integrates the drive motor and reducer into a wheel-side motor mounted on the vehicle frame, and transmits power between driving and flight modes through a set of gears that drive the propeller to rotate via the bidirectional output wheel-side motor. The wheels and propeller share a hollow support shaft, and the telescopic hydraulic structure for wheel reversing is integrated with the shock-absorbing suspension structure, effectively reducing the unsprung mass of the vehicle.

[0006] The technical solution of this invention is: a power unit for a flying car based on a wheel-side motor, comprising:

[0007] The wheel assembly includes a hub, an inner shaft coaxially connected to the outer end of the hub for driving the hub to rotate, a support shaft coaxially fitted on the outer diameter of the inner shaft and rotatably connected to the inner shaft, and a propeller coaxially fitted on the outer diameter of the support shaft and rotatably connected to the support shaft; the propeller is located in the inner cavity of the hub and is used to provide flight propulsion in flight mode;

[0008] The power and transmission components include a bidirectional output wheel-side motor fixed to the frame, a universal joint connecting the horizontal output shaft of the wheel-side motor to the inner end of the inner shaft, and a gear set connecting the vertical output shaft of the wheel-side motor to the propeller.

[0009] A wheel damping and reversing assembly includes a mounting bracket fixed to the vehicle frame and a telescopic damping mechanism; the end of the mounting bracket facing the wheel assembly is hinged to the inner end of a support shaft, and its top end is hinged to one end of the telescopic damping mechanism; the other end of the telescopic damping mechanism is hinged to the upper edge of the inner end of the support shaft; the telescopic damping mechanism is used for switching the position of the wheel assembly in flight mode and driving mode, and for damping in driving mode.

[0010] A further technical solution of the present invention is as follows: In the driving mode, the wheel assembly is in a vertical state, and the horizontal output shaft of the wheel-side motor, the universal joint, and the inner shaft are coaxial; in the flight mode, the wheel assembly is rotated to a horizontal state around the hinge of the mounting frame and the support shaft under the push of the telescopic damping mechanism, the horizontal output shaft of the wheel-side motor is perpendicular to the inner shaft, and the two ends of the universal joint are vertical.

[0011] A further technical solution of the present invention is: one end of the inner shaft is provided with a connecting flange for fixed connection with the hub by bolts; the middle part of the inner shaft is a smooth shaft section for mounting the inner bearing and rotating connection with the support shaft; the other end of the inner shaft is a prism structure for anti-rotation sleeve fixation with the universal coupling.

[0012] A further technical solution of the present invention is: a brake disc is coaxially provided at one end of the inner shaft near the connecting flange for mounting a brake caliper assembly.

[0013] A further technical solution of the present invention is as follows: the main body of the support shaft is a hollow shaft structure, one end of which has an inner diameter wall that is tightly fitted with the outer ring of the inner bearing, and an outer bearing is sleeved on the outer diameter wall of the same end, which is rotatably connected to the mounting part of the propeller through the outer bearing; the other end of the support shaft is provided with a hinge shaft and a first hinge hole, the two hinge shafts are horizontally arranged and symmetrically arranged on both sides of the end of the support shaft, the axis of the hinge shaft is perpendicularly intersecting the axis of the support shaft, and is used to hinge with the mounting frame; the first hinge hole is located at the upper edge of the end of the support shaft, parallel to the hinge shaft, and is used to hinge with the telescopic vibration damping mechanism through a pin.

[0014] A further technical solution of the present invention is as follows: the mounting frame includes a vertical rod and two horizontal rods; the vertical rod is vertically fixed to the vehicle frame; the two horizontal rods are symmetrically arranged and vertically fixed to the bottom end of the vertical rod on the side away from the vehicle frame; the end of the horizontal rod is provided with a through hole for hinged connection with the hinge shaft of the support shaft; the upper end of the vertical rod is provided with a connecting lug, and the connecting lug is provided with a second hinge hole parallel to the through hole of the horizontal rod for hinged connection with the telescopic vibration damping mechanism through the pin.

[0015] A further technical solution of the present invention is: the propeller includes a mounting shaft and a plurality of blades evenly distributed and fixed to the outer diameter of the mounting shaft; the mounting shaft serves as the mounting part of the propeller and has mounting holes along its axis, the inner wall of the mounting holes being tightly fitted with the outer ring of the outer bearing.

[0016] A further technical solution of the present invention is: the gear set includes a drive gear and a driven gear, the drive gear is coaxially and fixedly connected to the vertical output shaft of the wheel-side motor; the driven gear is fitted onto the outer diameter of the support shaft and rotatably connected to the support shaft, while being fixedly connected to the inner end face of the propeller mounting shaft; when the driven gear is rotated to a horizontal position with the wheel assembly, the drive gear and the driven gear mesh.

[0017] A further technical solution of the present invention is: the telescopic damping mechanism includes a telescopic hydraulic cylinder and a damping spring coaxially mounted on the outside of the hydraulic cylinder; when the hydraulic cylinder extends, it pushes the wheel assembly to flip to a horizontal state; when the hydraulic cylinder retracts and resets, the wheel assembly is in a vertical state, at which time the damping spring and the two ends of the hydraulic cylinder elastically resist each other, thereby playing a damping role for the wheel assembly in the driving state.

[0018] Beneficial effects

[0019] The beneficial effects of the present invention are as follows: The flying car power unit based on wheel-side motor of the present invention integrates the wheel and the propeller into a power unit with a compact structure. By switching different working modes, the flying car can effectively realize the functions of ground driving, vertical take-off and landing and air navigation.

[0020] Compared to existing convertible flying car technologies, this invention employs a dual-output shaft wheel-side motor integrating the drive motor and reducer, with the entire wheel-side motor fixed to the frame, forming a wheel-side motor drive mode. This facilitates weight reduction in the wheel system. In car driving mode, the wheel-side motor operates on its horizontal output shaft, driving the inner shaft and subsequently the wheel hub to rotate, achieving the wheel's driving function. In flight mode, the wheels flip to a horizontal position, and the wheel-side motor operates on its vertical output shaft, driving the drive gear to rotate, which in turn drives the driven gear to rotate. The driven gear then drives the propeller to rotate, generating flight thrust. This structural design changes the traditional power unit layout of convertible flying cars and eliminates the clutch, avoiding the structural complexity and high unsprung mass problems associated with integrating drive motors, reducers, and clutches into the wheel system in existing technologies.

[0021] In this invention, the wheel hub and the propeller share a hollow support shaft. The support shaft is connected to the inner shaft through an inner bearing and to the propeller through an outer bearing, making the structure more compact and reducing unsprung weight.

[0022] In this invention, the telescopic hydraulic structure used for wheel reversing is integrated with the shock-absorbing suspension structure into a telescopic shock-absorbing mechanism. The telescopic hydraulic cylinder and the shock-absorbing spring share a central axis, with the telescopic hydraulic cylinder inside and the shock-absorbing spring outside, which simplifies the structure and reduces the unsprung weight.

[0023] In vehicle driving mode, this invention controls the rotational speed of the horizontal output shafts of the wheel-side motors in the four power units via the vehicle control system. This allows the vehicle to perform turning and U-turns by changing the wheel speed, thus eliminating the need for a traditional steering mechanism. In flight mode, the control system controls the rotational speed of the vertical output shafts of the wheel-side motors in the four power units, thereby controlling the rotational speed of the four propellers to achieve flight functionality. The horizontal and vertical output shafts of the wheel-side motors can be controlled independently, with only one output shaft operating at a time. Attached Figure Description

[0024] Figure 1 This is an overall structural outline of the power unit according to an embodiment of the present invention (driving mode);

[0025] Figure 2 This is an external view of the overall structure of the power unit according to an embodiment of the present invention (flight mode);

[0026] Figure 3 This is a schematic diagram of the internal structure of the power unit in an embodiment of the present invention (driving mode);

[0027] Figure 4 for Figure 3 Diagram showing the installation relationship of the middle components;

[0028] Figure 5 This is a schematic diagram of the internal structure of the power unit in an embodiment of the present invention (flight mode);

[0029] Figure 6 for Figure 5 Diagram showing the installation relationship of the middle components;

[0030] Figure 7 This is a schematic diagram of the hub structure in an embodiment of the present invention;

[0031] Figure 8 This is a schematic diagram of the inner shaft structure in an embodiment of the present invention;

[0032] Figure 9 This is a schematic diagram of the brake caliper assembly structure in an embodiment of the present invention;

[0033] Figure 10 This is a schematic diagram of the support shaft structure in an embodiment of the present invention;

[0034] Figure 11 This is a schematic diagram of the telescopic vibration damping mechanism in an embodiment of the present invention;

[0035] Figure 12 This is a schematic diagram of the mounting bracket structure in an embodiment of the present invention;

[0036] Figure 13 This is a schematic diagram of the universal joint structure in an embodiment of the present invention;

[0037] Figure 14 This is a schematic diagram of the propeller structure in an embodiment of the present invention.

[0038] Explanation of reference numerals in the attached drawings: 1. Tire, 2. Hub, 3. Bolt, 4. Inner shaft, 401. Connecting flange, 402. Brake disc, 403. Smooth shaft section, 5. Brake caliper assembly, 501. Mounting ring, 502. First brake caliper, 503. Second brake caliper, 6. Outer bearing, 7. Inner bearing, 8. Support shaft, 801. Hinge shaft, 802. First hinge hole, 9. Telescopic vibration damping mechanism, 901. Hydraulic cylinder, 902. Vibration damping spring, 10. Mounting bracket, 101. Vertical rod, 102. Horizontal rod, 11. Wheel-side motor, 111. Horizontal output shaft of wheel-side motor, 112. Vertical output shaft of wheel-side motor, 12. Universal coupling, 13. Propeller, 14. Driven gear, 15. Drive gear. Detailed Implementation

[0039] The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0040] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0041] See Figure 1 , 2 This embodiment provides a power unit for a flying car based on wheel-side motors. The purpose is to provide a power unit solution that is different from existing convertible flying cars, so as to simplify the existing power unit structure, reduce the unsprung mass of the flying car, and have the characteristics of compact structure and light unsprung mass, which is beneficial to the handling and stability of the car.

[0042] In this embodiment, four sets of flying car power units based on wheel-side motors are assembled and installed on the vehicle body. For example... Figure 1 As shown, when the flying car is in ground driving mode, the wheels in the power unit are in a vertical position, perpendicular to the ground, and their operating state is the same as that of wheels in a regular vehicle. Figure 2 As shown, when the flying car is in vertical take-off and landing and air navigation mode, the wheels in the power unit are in a horizontal state, parallel to the ground. The four wheels work together to provide power through the rotation of the propeller.

[0043] See Figure 1-6 The flying car power unit based on wheel-side motor provided in this embodiment includes a tire 1, a wheel hub 2, an inner shaft 4, a support shaft 8, a telescopic damping mechanism 9, a mounting frame 10, a wheel-side motor 11, a propeller 13, and a pair of transmission gear sets.

[0044] See also Figure 7 A tire 1 is mounted on the outer diameter of the wheel hub 2. The outer side of the hub 2 has a spoke structure, and the center of the spoke structure is the hub mounting plate. The hub mounting plate is fixedly connected to the outer end of the inner axle 4 by multiple bolts 3. Specifically, the inner axle 4 is coaxial with the hub 2, located inside the hub 2, and is used to drive the hub 2 to rotate. Figure 8As shown, the outer side of the inner shaft 4 is a connecting flange 401 structure. The connecting flange 401 has five threaded holes evenly distributed around its circumference. Five bolts 3 pass through the hub mounting plate and the connecting flange 401 to achieve a fixed connection between the inner shaft 4 and the hub 2. The middle part of the inner shaft 4 is a smooth shaft section 403. The inner bearing 7 is coaxially fitted onto the smooth shaft section 403. The inner ring of the inner bearing 7 is tightly fitted with the smooth shaft section 403 of the inner shaft 4. The inner shaft 4 is used to achieve a rotatable connection between the inner shaft 4 and the support shaft 8. The inner end of the inner shaft 4, i.e., the end furthest from the connecting flange 401, is a quadrangular prism structure, used for anti-rotation connection and fixation with the universal coupling 12.

[0045] Universal joint 12 serves as a drive connector, with one end connected to the horizontal output shaft 111 of the wheel-side motor 11, and the other end connected to the tetragonal prism end of the inner shaft 4. For example... Figure 13 As shown, the universal joint 12 has a square recess at one end facing the inner shaft 4 that matches the quadrangular prism of the inner shaft 4, which is used for the two to fit together and prevent rotation.

[0046] See Figure 3 , 10 14. The support shaft 8 is a hollow sleeve structure, with one end being cylindrical and the other end being irregularly shaped. The cylindrical end of the support shaft 8 faces the inner shaft 4 and is coaxially fitted inside the inner shaft 4, i.e., the side facing away from the inner shaft 4 connecting flange 401. The inner diameter wall of the support shaft 8 is tightly fitted with the outer ring of the inner bearing 7. The propeller 13 is coaxially fitted onto the support shaft 8, and the propeller 13 and the support shaft 8 are rotatably connected via an outer bearing 6. Specifically, the outer diameter wall of the cylindrical end of the support shaft 8 is fitted with an outer bearing 6, and the inner ring of the outer bearing 6 is tightly fitted with the outer diameter wall of the support shaft 8. The propeller 13 includes a mounting shaft and multiple blades evenly distributed and fixed to the outer diameter of the mounting shaft. The mounting shaft serves as the mounting part of the propeller 13, and has mounting holes along its central axis. The inner wall of the mounting holes on the central shaft of the propeller 13 is tightly fitted with the outer ring of the outer bearing 6. The propeller 13 is entirely located within the cavity of the hub 2 and is used to provide flight propulsion in flight mode.

[0047] See Figure 3 , 9 To achieve wheel braking, a brake disc 402 is coaxially mounted on the inner axle 4 near the connecting flange 401 for mounting the brake caliper assembly 5. For example... Figure 9 As shown, the brake caliper assembly 5 includes a mounting ring 501, a first brake caliper 502, and a second brake caliper 503. The first brake caliper 502 and the mounting ring 501 are an integral structure. The mounting ring 501 is coaxially fitted onto the inner shaft 4, located inside the brake disc 402 and outside the support shaft 8, and is fixedly connected to the outer end face of the cylindrical end of the support shaft 8. The first brake caliper 502 and the second brake caliper 503 cooperate to clamp the brake disc 402 in the brake groove between them. Braking is achieved through friction between the brake caliper assembly 5 and the brake disc 402. The brake caliper assembly 5 is controlled by the vehicle control system.

[0048] See Figure 4 , 6 The propeller 13 is powered by a pair of transmission gears, specifically a driven gear 14 and a driving gear 15. The driving gear 15 is coaxially and fixedly connected to the vertical output shaft 112 of the wheel-side motor 11. The driven gear 14 is fitted onto the outer diameter of the support shaft 8 and is located inside the propeller 13. The driven gear 14 is rotatably connected to the support shaft 8 via bearings and is also fixedly connected to the inner end face of the mounting shaft of the propeller 13. When the driven gear 14 is rotated to a horizontal position with the wheel assembly, the driving gear 15 and the driven gear 14 mesh.

[0049] See Figure 3 , 4 10. The irregularly shaped end of the support shaft 8 is provided with a hinge shaft 801 and a first hinge hole 802. The two hinge shafts 801 are horizontally arranged and symmetrically located on both sides of the end of the support shaft 8. The axis of the hinge shaft 801 intersects the axis of the support shaft 8 perpendicularly, and is used to hinge with the horizontal end of the mounting bracket 10. The first hinge hole 802 of the support shaft 8 is located at the upper edge of the end of the support shaft 8 and is parallel to the hinge shaft 801. It is used to hinge with one end of the telescopic vibration damping mechanism 9 through a pin.

[0050] See Figure 1-6 11-12, Mounting bracket 10 is fixed to the vehicle frame. Mounting bracket 10 includes a vertical rod 101 and two horizontal rods 102. The vertical rod 101 has a V-shaped structure, with the V-shaped opening facing downwards and vertically fixed to the vehicle frame. The two horizontal rods 102 are symmetrically arranged and vertically fixed to the bottom end of the V-shaped opening on the side of the vertical rod 101 facing away from the vehicle frame. The end of the horizontal rod 102 has a through hole for hinged connection with the hinge shaft 801 of the support shaft 8. The upper end of the vertical rod 101 is provided with a connecting lug on the same side as the horizontal rod 102. The connecting lug has a second hinge hole parallel to the through hole of the horizontal rod 102 for hinged connection with the other end of the telescopic vibration damping mechanism 9 through a pin.

[0051] See Figure 1-6 , Figure 11The telescopic damping mechanism 9 includes a telescopic hydraulic cylinder 901 and a damping spring 902 coaxially mounted on the outside of the hydraulic cylinder 901. The hydraulic cylinder 901 is connected to the hydraulic system and controlled by the vehicle control system. The telescopic end of the hydraulic cylinder 901 is hinged to the first hinge hole 802 of the support shaft 8, and the fixed end of the hydraulic cylinder 901 is hinged to the second hinge hole of the mounting bracket 10. The axis of the telescopic damping mechanism 9 is coplanar with the axis of the support shaft 8. When the telescopic end of the hydraulic cylinder 901 extends, it pushes the support shaft 8 to rotate the entire wheel to a horizontal state, switching the power unit to flight mode. When the telescopic end of the hydraulic cylinder 901 retracts and resets, it pulls the support shaft 8 to make the entire wheel vertical, switching the power unit to driving mode. At this time, the damping spring 902 is in a contracted state, elastically resisting the two ends of the hydraulic cylinder 901, thus damping the vibration of the wheel during driving.

[0052] See Figure 1-6 The wheel-side motor 11 is fixed to the frame. The wheel-side motor 11 is a power assembly that integrates a drive motor and a reducer, and has two power output shafts, namely a horizontal output shaft 111 and a vertical output shaft 112. The horizontal output shaft 111 is used to provide power to the wheels in driving mode, and the vertical output shaft 112 is used to provide power to the propeller 13 in flight mode.

[0053] See Figure 1 , 3 4. In driving mode, the wheels are in a vertical position, with tire 1 in contact with the ground. The horizontal output shaft 111 of the wheel-side motor, the universal joint 12, and the inner shaft 4 are coaxial. At this time, the horizontal output shaft 111 of the wheel-side motor outputs a certain speed, which drives the universal joint 12 to rotate, which in turn drives the inner shaft 4 to rotate, and finally drives the wheel hub 2 to rotate, thus rotating the wheel. In driving mode, the propeller 13 remains stationary. By controlling the wheel speeds of the four power units, the vehicle can perform turning and U-turns.

[0054] See Figure 2 , 5 6. In flight mode, driven by the telescopic damping mechanism 9, the support shaft 8 rotates around the hinge shaft 801 between the mounting bracket 10 and the support shaft 8, making the wheel horizontal. At this time, both ends of the universal joint 12 are vertical, the horizontal output shaft 111 of the wheel-side motor is not working, and the drive gear 15 and the driven gear 14 mesh. By controlling the output speed of the vertical output shaft 112 of the wheel-side motor, the drive gear 15 is driven to rotate, which in turn drives the driven gear 14 to rotate, and then drives the propeller 13 to rotate around the support shaft 8, thereby generating flight propulsion. By controlling the speed of the propeller 13 in the four power units, the vehicle can perform actions such as climbing, cruising, descending, turning, and U-turns.

[0055] This invention integrates ground driving and air flight modules into a single power unit, which switches between different operating modes. It features a compact structure, diverse functions, and the characteristic of light unsprung mass, which is beneficial for vehicle handling and stability.

[0056] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A power unit for a flying car based on a wheel-side motor, characterized in that, include: The wheel assembly includes a hub, an inner shaft coaxially connected to the outer end of the hub for driving the hub to rotate, a support shaft coaxially fitted on the outer diameter of the inner shaft and rotatably connected to the inner shaft, and a propeller coaxially fitted on the outer diameter of the support shaft and rotatably connected to the support shaft; the propeller is located in the inner cavity of the hub and is used to provide flight propulsion in flight mode; The power and transmission components include a bidirectional output wheel-side motor fixed to the frame, a universal joint connecting the horizontal output shaft of the wheel-side motor to the inner end of the inner shaft, and a gear set connecting the vertical output shaft of the wheel-side motor to the propeller. A wheel damping and reversing assembly includes a mounting bracket fixed to the vehicle frame and a telescopic damping mechanism; the outer end of the mounting bracket facing the wheel assembly is hinged to the inner end of the support shaft, and the top end of the mounting bracket is hinged to one end of the telescopic damping mechanism; the other end of the telescopic damping mechanism is hinged to the upper edge of the inner end of the support shaft; the telescopic damping mechanism is used for switching the position of the wheel assembly in flight mode and driving mode, and for damping in driving mode.

2. The flying car power unit based on wheel-side motors according to claim 1, characterized in that, In the driving mode, the wheel assembly is in a vertical position, and the horizontal output shaft of the wheel-side motor, the universal joint, and the inner shaft are coaxial. In the flight mode, the wheel assembly is rotated to a horizontal position around the hinge of the mounting frame and the support shaft under the push of the telescopic damping mechanism. The horizontal output shaft of the wheel-side motor is perpendicular to the inner shaft, and both ends of the universal joint are vertical.

3. The flying car power unit based on wheel-side motors according to claim 1, characterized in that, One end of the inner shaft is provided with a connecting flange for fixing to the hub with bolts; the middle part of the inner shaft is a smooth shaft section for mounting the inner bearing and rotating the support shaft; the other end of the inner shaft is a prism structure for fixing to the universal joint anti-rotation sleeve.

4. The flying car power unit based on wheel-side motors according to claim 3, characterized in that, The inner shaft is coaxially mounted with a brake disc near the connecting flange end for mounting brake caliper assemblies.

5. The flying car power unit based on wheel-side motors according to claim 3, characterized in that, The main body of the support shaft is a hollow shaft structure. One end of its inner diameter wall is tightly fitted with the outer ring of the inner bearing, and the outer diameter wall of this end is fitted with an outer bearing, which is rotatably connected to the propeller mounting part through the outer bearing. The other end of the support shaft is provided with a hinge shaft and a first hinge hole. The two hinge shafts are horizontally arranged and symmetrically arranged on both sides of the end of the support shaft. The axis of the hinge shaft intersects the axis of the support shaft perpendicularly and is used to hinge with the mounting bracket. The first hinge hole is located at the edge of the end of the support shaft and is parallel to the hinge shaft. It is used to hinge with the telescopic vibration damping mechanism through a pin.

6. The flying car power unit based on wheel-side motors according to claim 5, characterized in that, The mounting bracket includes a vertical rod and two horizontal rods; the vertical rod is vertically fixed to the vehicle frame; the two horizontal rods are symmetrically arranged and vertically fixed to the bottom end of the vertical rod on the side facing away from the vehicle frame; the end of the horizontal rod is provided with a through hole for hinged connection with the hinge shaft of the support shaft; the upper end of the vertical rod is provided with a connecting lug, and the connecting lug is provided with a second hinge hole parallel to the through hole of the horizontal rod for hinged connection with the telescopic vibration damping mechanism through the pin.

7. The flying car power unit based on wheel-side motors according to claim 5, characterized in that, The propeller includes a mounting shaft and multiple blades evenly distributed and fixed to the outer diameter of the mounting shaft; the mounting shaft serves as the mounting part of the propeller and has mounting holes along its axis, with the inner wall of the mounting holes tightly fitted to the outer ring of the outer bearing.

8. The flying car power unit based on wheel-side motors according to claim 7, characterized in that, The gear set includes a drive gear and a driven gear. The drive gear is coaxially and fixedly connected to the vertical output shaft of the wheel-side motor. The driven gear is fitted onto the outer diameter of the support shaft and is rotatably connected to the support shaft. At the same time, it is fixedly connected to the inner end face of the propeller mounting shaft. When the driven gear is rotated to a horizontal position with the wheel assembly, the drive gear and the driven gear mesh.

9. The flying car power unit based on wheel-side motors according to claim 1, characterized in that, The telescopic damping mechanism includes a telescopic hydraulic cylinder and a damping spring coaxially mounted on the outside of the hydraulic cylinder. When the hydraulic cylinder extends, it pushes the wheel assembly to flip to a horizontal state. When the hydraulic cylinder retracts and resets, the wheel assembly is in a vertical state. At this time, the damping spring and the two ends of the hydraulic cylinder elastically resist each other, which plays a role in damping the wheel assembly when it is in motion.

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