Spinning with compact structure

Abstract

The utility model discloses a spinning with a compact structure. The spinning comprises a frame, a transmission shaft and pedals, wherein the transmission shaft is rotatably arranged on the frame; the pedals are arranged on the transmission shaft; the power supply device comprises a stator unit arranged on the frame, a rotor unit covering the stator unit and a power supply module electrically connected with the stator unit, and the stator unit comprises a stator iron core and a coil winding arranged on the stator iron core; the transmission shaft is matched and connected with the rotor unit through the planetary gear set; when the power supply module supplies power, the coil winding is electrified to generate a magnetic field, a rider drives the transmission shaft to rotate by treading the pedals, so that the planet wheel set is linked with the rotor unit to rotate relative to the coil winding, and the magnetic field of the rotating rotor unit interacts with the magnetic field of the electrified coil winding to enable the rotor unit to generate rotating resistance; when the power supply module does not supply power, a rider treads the pedals to drive the transmission shaft, so that the planet wheel set is linked with the rotor unit to rotate relative to the stator unit to generate electric energy.

Description

Technical Field

[0001] The utility model relates to the technical field of fitness equipment, and in particular discloses a compact-structured spinning bike. Background Art

[0002] Among existing technologies, magnetic resistance spinning bikes are gaining popularity among consumers for their unique resistance adjustment method and quiet performance. However, despite their excellent performance in many aspects, these bikes still have some significant shortcomings and deficiencies. For example, magnetic resistance spinning bikes control the resistance by adjusting the distance between the magnet and the flywheel. This contactless resistance adjustment method avoids physical wear, but also limits the maximum resistance value. The resistance structure of magnetic resistance spinning bikes is relatively complex, requiring precise motor control, electromagnets, and transmission mechanisms, which increases production costs to a certain extent. These problems urgently need to be addressed through technological innovation. Utility Model Content

[0003] In order to overcome the shortcomings and deficiencies in the prior art, the present invention aims to provide a compact spinning bike.

[0004] To achieve the above objectives, the present invention provides a compact spinning bike, comprising a frame, a transmission shaft rotatably mounted on the frame, and pedals mounted on the transmission shaft; a power supply device and a planetary gear set, the power supply device comprising a stator unit mounted on the frame, a rotor unit housing the stator unit, and a power module electrically connected to the stator unit; the stator unit comprising a stator core mounted on the frame and a coil winding mounted on the stator core; the transmission shaft being coupled to the rotor unit via the planetary gear set;

[0005] When the power module supplies power to the coil winding, the coil winding is energized to generate a magnetic field. The rider pedals to drive the transmission shaft to rotate, causing the planetary gear set to rotate relative to the coil winding in a linked manner. The magnetic field of the rotating rotor unit interacts with the magnetic field of the energized coil winding to cause the rotor unit to generate rotational resistance. When the power module is not supplying power, the rider pedals to drive the transmission shaft to rotate the planetary gear set in a linked manner to the stator unit in a linked manner to generate electrical energy.

[0006] Furthermore, the spinning bike also includes a power consumption unit connected to the power supply device, and the power consumption unit includes a central control screen arranged on the frame and a Type-C interface arranged on the central control screen; the central control screen is used to display the rider's exercise data, personalized settings and interactive information based on the spinning bike, and the smart terminal used by the rider interacts with the central control screen via the Type-C interface.

[0007] Furthermore, the exercise bike also includes a power storage module, the power supply device is electrically connected to the power consumption unit via the power storage module, the power access terminal of the Type-C interface is electrically connected to the output end of the power supply device or the output end of the power storage module, and the power supply device or the power storage module supplies power to the smart terminal used by the rider via the Type-C interface.

[0008] Furthermore, the planetary gear set includes an inner gear ring, a planetary carrier, planetary gears and a sun gear arranged on the frame; the planetary gears are connected to the transmission shaft via a wedge overrunning clutch, the planetary gears are connected to the planetary carrier, the planetary gears are meshed between the inner gear ring and the sun gear, and the planetary gears and the planetary carrier are used in conjunction with each other. The rider drives the transmission shaft to rotate by pedaling and links the planetary carrier to rotate so that the planetary gears drive the sun gear to rotate, and the rotating sun gear is used to link the rotor unit to rotate relative to the coil winding.

[0009] Furthermore, there are multiple planetary gears, which are arranged around the central axis of the planetary carrier. The diameter of the planetary gears is larger than the diameter of the sun gear, and the multiple planetary gears are rotatably arranged on the planetary carrier.

[0010] Furthermore, a first support frame is provided on the frame, and a first cover shell is provided on the first support frame to cover the planetary gear set. The first cover shell and the stator core are respectively arranged on both sides of the first support frame, and bearings are provided between the stator core and the transmission shaft, between the first cover shell and the transmission shaft, and between the rotor unit and the transmission shaft.

[0011] Furthermore, the power supply device also includes a second cover shell arranged on the stator core, and the second cover shell is arranged on an end of the stator unit away from the rotor unit; the second cover shell and the stator core are both detachably connected to the frame.

[0012] Furthermore, the frame includes a base frame placed on a bearing surface of an external bearing object, a first vertical frame arranged on the base frame, a first oblique frame arranged on the base frame and inclined relative to the first vertical frame, a seat cushion for supporting a rider and a first knob for adjusting the height of the seat cushion being telescopically arranged on the first oblique frame, and a handle for the rider to hold and a second knob for adjusting the height of the seat cushion being telescopically arranged on the top of the first vertical frame.

[0013] Furthermore, the base frame includes a second vertical frame and two first horizontal frames arranged at both ends of the second vertical frame. The first horizontal frame and the second vertical frame are arranged crosswise with each other, and flexible anti-slip pads are telescopically provided at both ends of the two first horizontal frames.

[0014] Furthermore, a side bracket is provided on the bottom frame of the frame, and two rolling elements are rotatably provided on the side bracket, and an extension direction of the side bracket is arranged to intersect with an extension direction of the bottom frame.

[0015] Beneficial effects of the present invention: The spinning bike of the present invention adopts an integrated and modular arrangement of the frame, power supply device, planetary gear set and driving parts (drive shaft and pedals), thereby ensuring the functionality of the spinning bike while saving its floor space and facilitating use and storage.

[0016] When the power module supplies power to the stator unit's coil windings, the coil windings generate a magnetic field. The rotating sun gear drives the rotor unit to rotate relative to the stator unit's coil windings. The rotor unit's magnetic field interacts with the magnetic field of the energized coil windings, generating rotational resistance, simulating riding resistance. Compared to magnetic resistance resistance adjustment, this method ensures sensitive adjustability while simplifying the overall structure and reducing multiple costs of the bicycle. When the power module is not supplying power, the rider's pedaling can still drive the drive shaft and planetary gear set to rotate, thereby driving the rotor unit to rotate relative to the stator unit. Since the stator unit's coil windings are not energized, the rotation of the rotor unit will generate an induced current in the coil windings, thereby generating electrical energy. This is both environmentally friendly and energy-saving, extending the device's battery life and increasing its usage scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of the spinning bike of the present invention;

[0018] Figure 2 for Figure 1 Schematic diagram of the enlarged structure of part A;

[0019] Figure 3 This is a schematic diagram of the power supply device and planetary gear of the utility model. Figure 1 ;

[0020] Figure 4 This is a schematic diagram of the power supply device and planetary gear of the utility model. Figure 2 ;

[0021] Figure 5 It is a schematic diagram of the partial cutaway structure of the present invention.

[0022] Reference numerals include:

[0023] 100. Frame; 1. Drive shaft; 2. Pedals; 3. Power supply device; 4. First support frame; 5. Central control screen; 10. Base frame; 101. Second vertical frame; 102. First horizontal frame; 103. Anti-slip pad; 11. First vertical frame; 111. Handle; 12. First oblique frame; 121. Cushion; 13. Side bracket; 131. Rolling element; 32. Rotor unit; 321. Magnetic element; 31. Stator unit; 30. Planetary gear set; 301. Planetary carrier; 302. Planetary gear; 303. Sun gear; 304. Internal gear ring; 305. Wedge overrunning clutch; 41. First cover; 310. Stator core; 311. Coil winding; 42. Bearing; 43. Second cover; 51. Type-C interface; 6. Counterweight wheel. DETAILED DESCRIPTION

[0024] In order to facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and drawings. The contents mentioned in the embodiments are not intended to limit the present invention.

[0025] See also Figures 1 to 5 As shown, the present invention is a compact spinning bicycle, comprising a frame 100, a transmission shaft 1 rotatably disposed on the frame 100, and pedals 2 disposed on the transmission shaft 1; a power supply device 3 and a planetary gear set 30, the power supply device 3 comprising a stator unit 31 disposed on the frame 100, a rotor unit 32 covered on the stator unit 31, and a power module (not shown) electrically connected to the stator unit 31, the stator unit 31 comprising a stator core 310 disposed on the frame 100 and a coil winding 311 disposed on the stator core 310, the transmission shaft 1 being cooperatively connected to the rotor unit 32 via the planetary gear set 30;

[0026] When the power module supplies power to the coil winding 311, the coil winding 311 is energized to generate a magnetic field. The rider drives the transmission shaft 1 to rotate by stepping on the pedal 2, so that the planetary gear set 30 and the rotor unit 32 rotate relative to the coil winding 311. The magnetic field of the rotating rotor unit 32 interacts with the magnetic field of the energized coil winding 311 to cause the rotor unit 32 to generate rotational resistance. When the power module does not supply power, the rider drives the transmission shaft 1 by stepping on the pedal 2, so that the planetary gear set 30 and the rotor unit 32 rotate relative to the stator unit 31 to generate electrical energy.

[0027] Specifically, when the user steps on the pedal 2, the pedal 2 drives the transmission shaft 1 to rotate, and the transmission shaft 1 is connected to the rotor unit 32 through the planetary gear set 30. The function of the planetary gear set 30 is to convert the high speed and low torque of the transmission shaft 1 into the low speed and high torque rotation of the rotor unit 32. The rotor unit 32 is equipped with a magnetic part 321 (such as a permanent magnet, etc.), while the stator unit 31 is statically mounted on the cycling frame 100 and located inside the rotor unit 32. The rotating rotor unit 32 (with a permanent magnet or an induction coil) rotates in the stator magnetic field, and the interaction between the magnetic fields between the two generates an electromagnetic force (or electromagnetic torque), which causes the rotor unit 32 to be subjected to resistance. This resistance is fed back to the rider, increasing the difficulty and challenge of riding, thereby realizing the fitness function of the spinning bike.

[0028] As the rotor unit 32 rotates, the magnetic element 321 moves relative to the stator unit 31. According to Faraday's law of electromagnetic induction, this relative motion generates a changing magnetic field in the stator unit 31, which in turn generates an induced electromotive force in the coil. Ultimately, this closed circuit forms a current, generating electrical energy. This electrical energy can be stored in an external battery or directly supplied to the spinning bike's load (such as the control system, touch screen, etc.).

[0029] In generator mode, the spinning bike can convert the rider's mechanical energy into electrical energy to power itself or other devices, reducing dependence on and consumption of traditional energy. In motor mode, by adjusting the power supply intensity of the power module, the interaction force between the stator magnetic field and the rotor unit 32 can be changed, thereby adjusting the resistance during riding and providing the rider with a more personalized exercise experience. This spinning bike integrates the functions of a generator and a motor into a compact structure, reducing the size and weight of the device and making it easy to carry and store.

[0030] Specifically, the planetary gear set 30 includes an inner gear ring 304, a planetary carrier 301, a planetary gear 302 and a sun gear 303 arranged on the frame 100; the planetary gear 302 is connected to the transmission shaft 1 via a wedge overrunning clutch 305, and the planetary gear 302 is connected to the planetary carrier 301. The planetary gear 302 is engaged between the inner gear ring 304 and the sun gear 303. The planetary gear 302 is used in conjunction with the planetary carrier 301. The rider drives the transmission shaft 1 to rotate by stepping on the pedal 2 and links the planetary carrier 301 to rotate, so that the planetary gear 302 drives the sun gear 303 to rotate, and the rotating sun gear 303 is used to link the rotor unit 32 to rotate relative to the coil winding 311.

[0031] The sun gear 303 is bolted to the rotor unit 32. The rotor unit 32 is rotatably mounted on the transmission shaft 1 via two bearings 42. The vehicle frame 100 is also provided with a first housing 41, which covers the planetary gear set 30 to protect the internal gears from dust and impurities. An inner ring gear 304 is secured to the inner wall of the first housing 41 and meshes with the planetary gears 302. The planetary gears 302 mesh between the inner ring gear 304 and the sun gear 303.

[0032] The sprag overrunning clutch 305 in this embodiment comprises an inner ring connected to the transmission shaft 1, an outer ring connected to the planetary carrier 301, and a specially shaped sprag located between the inner and outer rings. When the rotation direction of the inner ring (transmission shaft 1) is the same as the potential rotation direction of the outer ring (planetary carrier 301), and the inner ring's speed is greater than that of the outer ring, the specially shaped sprag is compressed by the inner and outer rings, thereby transmitting torque, and the spinning bike is in a normal riding state. At this time, the rider pedals 2, rotating the transmission shaft 1. This rotation is transmitted to the planetary carrier 301 via the sprag overrunning clutch 305, which in turn drives the sun gear 303, which in turn rotates the rotor unit 32, causing the magnetic member 321 within the rotor unit 32 to rotate relative to the stator unit 31.

[0033] When the inner ring (drive shaft 1) changes direction (due to the rider's counter-pedaling) or its speed drops below that of the outer ring (planet carrier 301) (due to the rider's pedaling speed), the friction between the inner and outer rings of the shaped wedge is insufficient to maintain their compression. At this point, the shaped wedge slides relative to the inner and outer rings, achieving an overrunning function. This means that the rotation of the inner ring does not drive the outer ring (and therefore the drive shaft 1 does not drive the planet carrier 301). At this point, the spinning bike is not in a normal riding state. This allows the drive shaft 1 to rotate freely relative to the planet carrier 301, creating idle motion. This protects the planetary gear set 30 and rotor unit 32 from the reverse torque. By preventing the transmission of reverse torque, the planetary gear set 30, power supply 3, and other components are effectively protected from damage. Furthermore, the rider no longer needs to worry about the adverse effects of reverse pedaling 2 on the equipment, enhancing riding freedom and safety.

[0034] When tested under the same unloaded conditions, the no-load friction torque of the wedge overrunning clutch 305 is gf.cm, and the no-load friction torque of the roller one-way wedge overrunning clutch 305 is gf.cm. This means that when the spinning bike is not in a power-generating state, that is, when it is idling or running at a low speed, the wedge overrunning clutch 305 can reduce unnecessary energy loss compared to the roller one-way wedge overrunning clutch 305, and the connection of the transmission shaft 1 is smoother, reducing noise and vibration caused by friction, thereby improving the rider's comfort and improving transmission efficiency.

[0035] Specifically, there are multiple planetary gears 302, each arranged around the central axis of the planetary carrier 301. The planetary gears 302 are rotatably mounted on the planetary carrier 301. The diameter of the planetary gears 302 is greater than the diameter of the sun gear 303. When the transmission shaft 1 rotates, the sun gear 303 drives the planetary gears 302 to orbit around it, while the planetary gears 302 also rotate on their own. This combined motion causes the planetary carrier 301 (and, in turn, the rotor unit 32) to rotate at a lower speed, but with significantly increased torque, thereby helping users achieve fitness benefits.

[0036] Specifically, the spinning bike also includes an electrical unit connected to the power supply device 3, which includes a central control screen 5 provided on the frame 100 and a Type-C interface 51 provided on the central control screen 5. The central control screen 5 is used to display the rider's exercise data (such as speed, distance, calorie consumption, etc.), personalized settings (such as resistance level, exercise mode, etc.), and interactive information (such as music playback, video tutorials, etc.) based on the spinning bike. The smart terminal used by the rider exchanges data with the central control screen 5 via the Type-C interface 51. The spinning bike also has a control system connected to the central control screen 5. The central control screen 5 is connected to the power module of the power supply device 3 via a wire. The user can control the central control screen 5 and use the control system to adjust the current output by the power module to the coil winding 311 to achieve resistance adjustment. According to Ampere's law, the greater the current in the coil winding 311, the stronger the magnetic field it generates. The stronger the magnetic field generated by the coil winding 311, the greater the interaction force between the magnetic field of the magnetic part 321 on the rotor unit 32 and the magnetic field generated by the coil winding 311. The rider needs to use a faster speed and greater force to drive the rotor unit 32 to rotate to achieve the purpose of fitness.

[0037] Specifically, the spinning bike also includes a power storage module, and the power supply device 3 is electrically connected to the power consumption unit via the power storage module. The power access terminal of the Type-C interface 51 is electrically connected to the output end of the power supply device 3 or the output end of the power storage module. The power supply device 3 or the power storage module supplies power to the smart terminal used by the rider via the Type-C interface 51. The charging function of the Type-C interface 51 provides great convenience for the rider. During the ride, the rider does not need to carry an additional charger or mobile power supply, and can charge by simply connecting the smart terminal to the central control screen 5. In this embodiment, a storage slot for placing the rider's smart terminal is provided above the central control screen 5. The design of the storage slot is more in line with the rider's usage habits.

[0038] Specifically, a "U"-shaped first support frame 4 is provided on the frame 100. The first support frame 4 serves as the core supporting structure, and its "U"-shaped design allows other components of the power supply device 3 (such as the first cover 41, the stator core 310, the rotor unit 32, etc.) to be arranged in an orderly manner on both sides thereof. This layout is compact and reasonable, which helps to reduce the overall volume and weight while improving the stability and durability of the system. The first cover 41 and the stator core 310 are respectively arranged on both sides of the first support frame 4, and the coil winding 311 is fixed to the outer surface of the stator core 310. Bearings 42 are provided between the stator core 310 and the drive shaft 1, between the first cover 41 and the drive shaft 1, and between the rotor unit 32 and the drive shaft 1. The use of bearings 42 reduces friction and wear between rotating parts and improves transmission efficiency.

[0039] Specifically, the power supply device 3 further includes a second cover 43 disposed on the stator core 310. The second cover 43 covers the end of the stator unit 31 away from the rotor unit 32. Both the second cover 43 and the stator core 310 are detachably connected to the first support frame 4. The second cover 43 is disposed on the stator core 310 and covers the end of the stator unit 31 away from the rotor unit 32. This design not only protects the stator unit 31 from external environmental damage (such as dust, moisture, and mechanical shock), but also helps improve the efficiency and stability of energy conversion.

[0040] Both the first cover 41 and the stator core 310 are detachably connected to the first support frame 4. This design allows users or maintenance personnel to inspect, replace, or upgrade internal components without disassembling the entire power supply unit 3. It also facilitates assembly and commissioning during production. The stable working environment of the stator unit 31 and the optimized transmission structure help improve energy conversion efficiency, allowing the spinning bike to generate more electricity during riding.

[0041] Specifically, multiple heat dissipation holes are provided on both the first and second housings 41, 43. During intense cycling, heat generated by the power supply device 3 is released through these holes, thereby ensuring normal operation of the power supply device 3. In actual use, a small air cooler or other device can be installed on the first and second housings 41, 43, and powered by a battery connected to the power supply device 3, ensuring efficient use of electrical energy and stable operation of the power supply device 3.

[0042] In actual use, a counterweight wheel 6 can be installed on the outside of the rotor unit 32. The weight of the counterweight wheel 6 is much greater than the weight of the rotor unit 32. This design can save energy consumption of the power supply device 3 to a certain extent while ensuring the rider's fitness experience.

[0043] Specifically, the frame 100 includes a base frame 10 positioned on a support surface for external loads, a first vertical frame 11 mounted on the base frame 10, and a first diagonal frame 12 mounted on the base frame 10 and tilted relative to the first vertical frame 11. The base frame 10 is arranged in an "I" shape. This "I" shape enhances the load-bearing capacity and stability of the base frame 10, making the exercise bike less susceptible to shaking or tipping during use. The first vertical frame 11 is positioned perpendicular to the base frame 10. The first diagonal frame 12 is telescopically mounted with a seat 121 for supporting a rider and a first knob for adjusting the height of the seat 121. A handlebar 111 for the rider to hold and a second knob for adjusting the height of the seat 121 are telescopically mounted on the top of the first vertical frame 11.

[0044] The first diagonal frame 12 is tilted relative to the first vertical frame 11. This design helps disperse riding forces and improve overall stability. A retractable seat cushion 121 is mounted on the first diagonal frame 12, allowing users to adjust the height and angle of the cushion 121 based on their height and comfort level. The adjustable seat cushion 121 and handlebars 111 meet the personalized needs of different users and enhance riding comfort.

[0045] Specifically, the base frame 10 includes a second vertical frame 101 and two first horizontal frames 102 arranged at both ends of the second vertical frame 101. The first horizontal frame 102 and the second vertical frame 101 are arranged perpendicular to each other to form an "I" structure. Flexible anti-skid pads 103 are telescopically provided at both ends of the two first horizontal frames 102. The flexible anti-skid pads 103 telescopically provided at both ends of the base frame 10 can be adjusted according to different ground conditions to ensure that the spinning bike can be placed firmly on the ground. Whether it is a smooth tile floor or a rough wooden floor, the anti-skid pads 103 can provide sufficient friction to prevent the device from sliding during use. Since the anti-skid pads 103 are retractable, when the spinning bike needs to be transported or stored, the anti-skid pads 103 can be retracted to reduce the volume and weight of the device, making it easier to transport and store.

[0046] Specifically, the chassis 10 of the frame 100 is provided with a side bracket 13, and two rolling elements 131 are rotatably provided on the side bracket 13. The extension direction of the side bracket 13 is arranged to intersect with the extension direction of the chassis 10. In this embodiment, the chassis 10 of the frame 100 is provided with two side brackets 13, and a rolling element 131 is rotatably provided on each of the two side brackets 13. This distribution design prevents the function from being damaged due to damage to one of the side brackets 13; the angle design between the side bracket 13 and the chassis 10 helps to maintain the balance of the bicycle during movement and prevent accidents such as rollover. When the bicycle needs to be moved, the placement of the bicycle can be adjusted by simply pressing down the handle 111 so that the rolling element 131 contacts the ground. This structure is simple and reasonable, operates stably, and can optimize costs to a certain extent.

[0047] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there may be changes in the specific implementation methods and application scope. The content of this specification should not be understood as limiting the present invention.

Claims

1. A compact spinning bicycle comprising a frame (100), a transmission shaft (1) rotatably mounted on the frame (100), and pedals (2) mounted on the transmission shaft (1); characterized in that: The vehicle further comprises a power supply device (3) and a planetary gear set (30), wherein the power supply device (3) comprises a stator unit (31) arranged on the vehicle frame (100), a rotor unit (32) covered on the stator unit (31), and a power module electrically connected to the stator unit (31), wherein the stator unit (31) comprises a stator core (310) arranged on the vehicle frame (100) and a coil winding (311) arranged on the stator core (310), and the transmission shaft (1) is connected to the rotor unit (32) via the planetary gear set (30); When the power module supplies power to the coil winding (311), the coil winding (311) is energized to generate a magnetic field, and the rider steps on the pedals (2) to drive the transmission shaft (1) to rotate, causing the planetary gear set (30) to link the rotor unit (32) to rotate relative to the coil winding (311), and the magnetic field of the rotating rotor unit (32) interacts with the magnetic field of the energized coil winding (311) to cause the rotor unit (32) to generate rotation resistance; when the power module does not supply power, the rider steps on the pedals (2) to drive the transmission shaft (1), causing the planetary gear set (30) to link the rotor unit (32) to rotate relative to the stator unit (31), thereby generating electrical energy.

2. The compact spinning bike according to claim 1, characterized in that: The planetary gear set (30) comprises an inner gear ring (304), a planet carrier (301), a planetary gear (302) and a sun gear (303) arranged on a bicycle frame (100); the planetary gear (302) is connected to the transmission shaft (1) via a sprag overrunning clutch (305); the planetary gear (302) is connected to the planet carrier (301); the planetary gear (302) is meshed between the inner gear ring (304) and the sun gear (303); the planetary gear (302) and the planet carrier (301) are used in conjunction with each other; a rider drives the transmission shaft (1) to rotate by stepping on a pedal (2) and drives the planet carrier (301) to rotate, so that the planetary gear (302) drives the sun gear (303) to rotate; the rotating sun gear (303) is used to drive the rotor unit (32) to rotate relative to the coil winding (311).

3. The compact spinning bike according to claim 2, characterized in that: There are multiple planetary gears (302), and the multiple planetary gears (302) are arranged around the central axis of the planetary carrier (301). The diameter of the planetary gear (302) is larger than the diameter of the sun gear (303). The multiple planetary gears (302) are rotatably arranged on the planetary carrier (301).

4. The compact spinning bike according to claim 1, characterized in that: The spinning bike further comprises an electric unit connected to the power supply device (3), the electric unit comprising a central control screen (5) arranged on the frame (100) and a Type-C interface (51) arranged on the central control screen (5); the central control screen (5) is used to display the rider's exercise data, personalized settings, and interactive information based on the spinning bike, and the smart terminal used by the rider exchanges data with the central control screen (5) via the Type-C interface (51).

5. The compact spinning bike according to claim 4, characterized in that: The spinning bike further comprises a power storage module, the power supply device (3) is electrically connected to the power consumption unit via the power storage module, the power access terminal of the Type-C interface (51) is electrically connected to the output end of the power supply device (3) or the output end of the power storage module, and the power supply device (3) or the power storage module supplies power to the smart terminal used by the rider via the Type-C interface (51).

6. The compact spinning bike according to claim 1, characterized in that: A first support frame (4) is provided on the vehicle frame (100), a first cover shell (41) is provided on the first support frame (4) and is covered on the planetary gear set (30), the first cover shell (41) and the stator core (310) are respectively arranged on both sides of the first support frame (4), and bearings (42) are provided between the stator core (310) and the transmission shaft (1), between the first cover shell (41) and the transmission shaft (1), and between the rotor unit (32) and the transmission shaft (1).

7. The compact spinning bike according to claim 1, characterized in that: The power supply device (3) further comprises a second cover (43) arranged on the stator core (310), the second cover (43) being arranged to cover an end of the stator unit (31) away from the rotor unit (32); the second cover (43) and the stator core (310) are both detachably connected to the vehicle frame (100).

8. The compact spinning bike according to claim 1, characterized in that: The frame (100) comprises a bottom frame (10) placed on a bearing surface of an external bearing object, a first vertical frame (11) arranged on the bottom frame (10), and a first oblique frame (12) arranged on the bottom frame (10) and inclined relative to the first vertical frame (11); a seat cushion (121) for supporting a rider is telescopically arranged on the first oblique frame (12); and a handlebar (111) for the rider to hold is telescopically arranged on the top of the first vertical frame (11).

9. The compact spinning bike according to claim 8, characterized in that: The base frame (10) comprises a second vertical frame (101) and two first horizontal frames (102) arranged at both ends of the second vertical frame (101); the first horizontal frames (102) and the second vertical frames (101) are arranged crosswise with each other; and flexible anti-slip pads (103) are telescopically arranged at both ends of the two first horizontal frames (102).

10. The compact spinning bike according to claim 1, characterized in that: A side bracket (13) is provided on the bottom frame (10) of the vehicle frame (100), two rolling elements (131) are rotatably provided on the side bracket (13), and the extension direction of the side bracket (13) and the extension direction of the bottom frame (10) are arranged to intersect with each other.

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