A compact flywheel for a spin bike

Abstract

The utility model discloses a small -size flywheel for dynamic bicycle belongs to dynamic bicycle technical field, including inner magnetic subassembly, installation main shaft, counterweight flywheel and a plurality of fan blade, and installation main shaft is used for with frame fixed connection, and inner magnetic subassembly is fixed on installation main shaft, and counterweight flywheel rotation is installed on installation main shaft, one side of counterweight flywheel is provided with containing cavity, and inner magnetic subassembly is located in containing cavity, the counterweight flywheel outside center position is provided with counterweight ring, the fan blade includes bending part and fan face part, one side of bending part is with counterweight ring side surface clings to, and bending part is connected with counterweight ring through screw, and fan face part is along the width direction of counterweight flywheel and sets up. Adopt inner magnetic resistance to make the adjustment more convenient, and counterweight flywheel retains the weight of original flywheel, and fan blade changes side surface connection mode, and the air flow path is optimized, so that can produce wind power and increase the riding experience while guaranteeing enough resistance.

Description

Technical Field

[0001] This utility model relates to the field of exercise bike technology, and in particular to a small flywheel for exercise bikes. Background Technology

[0002] A spinning bike is an indoor fitness machine that simulates outdoor cycling. By adjusting resistance and riding posture (seated, standing, climbing, etc.), it provides a full-body aerobic workout. To simulate real-world cycling resistance, a flywheel is typically installed on the front wheel. The flywheel is the "heart" of the spinning bike, directly affecting the riding experience and training results. The flywheel has the following functions: Inertial energy storage: It stores kinetic energy as it rotates, using inertia to propel the pedals when you lift your leg, preventing "missed pedaling" and making the ride more fluid. Resistance adjustment: By changing the degree of contact between the flywheel and the brake pads / magnetic field, it simulates different road conditions (flat roads, climbing). Improved stability: The greater the weight, the stronger the inertia, resulting in a smoother ride and reducing knee compensation.

[0003] Chinese Patent Publication No. CN222841479U discloses a stationary bike with a fan wheel. The equipment includes a frame and a riding assembly housed within the frame. The riding assembly includes a handlebar, pedals, and a front wheel. The handlebar is positioned above the front wheel, and the pedals are located on one side of the front wheel. The front wheel includes a rotating axle and several fan blades arranged in a ring around the rotating axle. The pedals are connected to the rotating axle via a conveyor belt; pedaling the pedals rotates the rotating axle.

[0004] However, in order to ensure sufficient inertia, especially after the blades are installed, existing flywheels are difficult to make small, which means that some small exercise bikes cannot install fan blades to improve the riding experience. Utility Model Content

[0005] To address the aforementioned problems, this invention aims to solve the problems described above. One objective of this invention is to provide a small flywheel for a stationary bike that solves one of the problems described above.

[0006] The solution adopted in this embodiment is as follows: a small flywheel for a stationary bike, including an internal magnetic assembly, a mounting spindle, a counterweight flywheel, and several fan blades. The mounting spindle is used to fix it to the frame. The internal magnetic assembly is fixed on the mounting spindle. The counterweight flywheel is rotatably mounted on the mounting spindle. A receiving cavity is provided on one side of the counterweight flywheel, and the internal magnetic assembly is located in the receiving cavity. A counterweight ring is provided at the center of the outer side of the counterweight flywheel. The fan blades include a bent portion and a fan surface. One side of the bent portion is in contact with the side of the counterweight ring. The bent portion is connected to the counterweight ring by screws. The fan surface is arranged along the width direction of the counterweight flywheel.

[0007] The preferred technical solution is that the fan blade is integrally formed, a cutting groove is provided in the middle of the lower side of the fan blade, the length of the cutting groove is greater than half the width of the fan blade, the area below the cutting groove is bent to form the bending part, and the remaining part is the fan blade part, the bending part is perpendicular to the fan surface.

[0008] To ensure a stable connection and sufficient counterweight, a connecting inner disc is provided on the side of the counterweight flywheel away from the inner magnetic assembly. A bearing sleeve is located at the center of the connecting inner disc, and a pulley is located on the outer side of the bearing sleeve. The pulley is used for connection and transmission with the pedal wheel. A bearing is built into the bearing sleeve, and the mounting spindle is installed in the bearing.

[0009] To ensure the stability of the counterweight flywheel during operation, several center of gravity adjustment holes are provided on the connecting inner disk.

[0010] To facilitate the adjustment of resistance by the inner magnet, an air gap is provided between the inner wall of the receiving cavity and the inner magnetic assembly. Several magnets are provided on the outermost side of the inner magnetic assembly. The inner magnetic assembly is also provided with an adjustment mechanism, which is connected to the magnets and drives the magnets away from or closer to the inner wall of the receiving cavity.

[0011] The specific structure is as follows: the inner magnetic component includes a fixed frame; the adjustment mechanism includes an arc-shaped iron plate, an adjustment steel wire, and several support columns; the support columns are located inside the fixed frame and are fixedly connected to both sides of the fixed frame; the adjustment steel wire passes around the support columns and is connected to one end of the arc-shaped iron plate; the other end of the arc-shaped iron plate is provided with a hook part; the hook part is engaged with the two side walls of the fixed frame; and several magnets are provided on each arc-shaped iron plate.

[0012] Furthermore, a return spring is provided on the inner side of the arc-shaped iron plate. The return spring abuts against the arc-shaped iron plate and provides a force to the arc-shaped iron plate to move towards the inner wall of the receiving cavity.

[0013] Preferably, the counterweight flywheel has a radius of 100-150mm and a blade length of 30-60mm.

[0014] In order to stabilize the resistance and generate a larger wind, the plane on which the fan blade is located does not pass through the center of the counterweight flywheel, and the plane of the fan blade is tilted in the direction of rotation of the counterweight flywheel.

[0015] Preferably, to ensure stable connection, a recessed groove is provided on the outer side of the inner magnetic component, and a reinforcing connecting seat is provided at the center of the recessed groove. The mounting spindle passes through the reinforcing connecting seat and is fixedly connected to it. The reinforcing connecting seat is provided with a connecting plane, and the connecting plane is fixedly connected to the fixing frame.

[0016] Compared with the prior art, the small flywheel of this utility model for exercise bikes has the following technical advantages:

[0017] 1. This application relates to a small flywheel for a stationary bike, comprising an internal magnetic assembly, a mounting spindle, a counterweight flywheel, and several fan blades. The mounting spindle is used for fixed connection to the frame, the internal magnetic assembly is fixed on the mounting spindle, and the counterweight flywheel is rotatably mounted on the mounting spindle. A receiving cavity is provided on one side of the counterweight flywheel, and the internal magnetic assembly is located in the receiving cavity. A counterweight ring is provided at the center of the outer side of the counterweight flywheel. The fan blades include a bent portion and a fan surface. One side of the bent portion fits against the side of the counterweight ring, and the bent portion is connected to the counterweight ring by screws. The fan surface is arranged along the width direction of the counterweight flywheel. The use of internal magnetic resistance makes adjustment more convenient. The counterweight flywheel retains the weight of the original flywheel, and the fan blades are changed to a side-connection method, optimizing the airflow path. The fan blade installation is more convenient and stable, allowing for sufficient resistance while generating wind to enhance the riding experience.

[0018] Other features and advantages of the present invention will become clear when reading the following description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention. In these drawings, similar reference numerals are used to denote similar elements. The drawings described below are some embodiments of the present invention, but not all embodiments. Other drawings will be readily available to those skilled in the art based on these drawings without any inventive effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the front side of a small flywheel for a stationary bike provided in a specific embodiment of this utility model;

[0021] Figure 2 This is a schematic diagram of the overall rear structure of a small flywheel for a stationary bike provided in a specific embodiment of this utility model;

[0022] Figure 3 This is a schematic diagram of the exploded structure of the internal magnetic component provided in a specific embodiment of this utility model;

[0023] Figure 4 This is a schematic diagram of the structure of a small flywheel installed on a stationary bike according to a specific embodiment of this utility model;

[0024] Figure 5 This is a schematic diagram of the belt pulley transmission structure provided in a specific embodiment of this utility model.

[0025] In the picture:

[0026] 1. Internal magnetic assembly; 2. Counterweight flywheel; 3. Fan blade; 4. Mounting spindle; 11. Sinking groove; 12. Reinforced connecting seat; 13. Fixing frame; 14. Adjusting steel wire; 15. Support column; 16. Curved iron plate; 17. Magnet; 18. Return spring; 161. Hook part; 21. Counterweight ring; 22. Receiving cavity; 23. Bearing sleeve; 24. Connecting inner plate; 25. Center of gravity adjustment hole; 26. Pulley; 31. Fan surface; 32. Bending part. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other.

[0028] The small flywheel for exercise bikes will be described in detail below with reference to the accompanying drawings and embodiments.

[0029] like Figure 1-5As shown, a small flywheel for a stationary bike includes an internal magnetic assembly 1, a mounting shaft 4, a counterweight flywheel 2, and several blades 3. The mounting shaft 4 is used to fix it to the frame. The internal magnetic assembly 1 is fixed to the mounting shaft 4. The counterweight flywheel 2 is rotatably mounted on the mounting shaft 4. A receiving cavity 22 is provided on one side of the counterweight flywheel 2, and the internal magnetic assembly 1 is located in the receiving cavity 22. The internal magnetic assembly 1 and the counterweight flywheel 2 adjust the resistance through magnetic resistance. Based on the principle of electromagnetic induction, the change in the distance between the magnet 17 and the flywheel directly affects the magnetic field strength, thereby controlling the resistance. Users can adjust the resistance in real time by mechanical or electric means to adapt to different training intensities. A counterweight ring 21 is provided at the center of the outer side of the counterweight flywheel 2. The blades 3 include a bent portion 32 and a fan-shaped portion 31. One side of the bent portion 32 is attached to the side of the counterweight ring 21. The bent portion 32 and the counterweight ring 21 are connected by screws. The fan-shaped portion 31 is arranged along the width direction of the counterweight flywheel 2. The fan blade 3 is side-mounted, using the bend 32 to fit snugly against the counterweight ring 21 and secured with screws to ensure structural stability. The windward surface has no mounting structure, reducing airflow interference. Installation is convenient; maintenance only requires replacing a single fan blade 3, reducing costs; the windward area is increased. The counterweight flywheel 2 uses magnetic material, allowing it to interact with the internal magnetic component 1 to adjust resistance. Stepless speed regulation is achieved by adjusting the magnetic resistance by changing the air gap distance. Resistance adjustment is smooth and continuous, without any jerking, simulating the feeling of real cycling, suitable for endurance and interval training. The counterweight ring 21 can be selected with an appropriate thickness according to requirements. The side-mounted design of the fan blade 3, using the bend 32 for installation, makes it more convenient, and subsequent maintenance only requires replacing a single blade. The windward surface of the fan blade 3 has no mounting structure, resulting in a larger windward area; even a smaller fan section 31 can provide significant airflow. Side mounting reduces the contact area between the fan blade 3 and the counterweight ring 21, and the bend 32 design simplifies the installation process; the unobstructed windward surface optimizes the airflow path. Reduces assembly difficulty and improves maintenance efficiency; increases the wind-receiving area, resulting in increased airflow output for the same size and enhanced heat dissipation performance.

[0030] The preferred technical solution is that the fan blade 3 is integrally formed, and a cutting groove is provided at the middle of the lower side of the fan blade 3. The length of the cutting groove is greater than half the width of the fan blade 3. The area below the cutting groove is bent to form the bent portion 32, and the remaining part is the fan blade 3. The bent portion 32 is perpendicular to the fan surface 31. The integral forming process reduces welding or splicing steps, and the cutting groove design facilitates the formation of the bent portion 32, simplifying the production process. The transition between the bent portion 32 and the fan blade 3 is smooth, reducing stress concentration and extending the service life to more than 5 years. The fan blade 3 is simple to process, which can effectively reduce production costs. The integral forming and cutting groove design simplify the mold complexity and reduce material waste. The production cost of a single fan blade 3 is reduced, making it suitable for large-scale mass production.

[0031] To ensure stable connection and sufficient counterweight, a connecting inner disc 24 is located on the side of the counterweight flywheel 2 away from the inner magnetic component 1. A bearing sleeve 23 is positioned at the center of the connecting inner disc 24, and a pulley 26 is located on the outer side of the bearing sleeve 23. A bearing is built into the bearing sleeve 23, and the mounting spindle 4 is installed within the bearing. The bearing sleeve 23 supports the mounting spindle 4, reducing friction; the pulley 26 is used for transmission and connects with the pedal wheel; the bearing ensures smooth rotation of the flywheel. The counterweight flywheel 2 is integrally cast, which improves structural integrity and optimizes dynamic balance performance. This reduces vibration and noise, improves operational stability, and is suitable for high-intensity training scenarios. The uneven mass distribution of the counterweight flywheel 2 can cause vibration during high-speed operation. To ensure stable operation of the counterweight flywheel 2, several center-of-gravity adjustment holes 25 are provided on the connecting inner disc 24. This improves user riding comfort and adapts to different counterweight requirements, enhancing product adaptability.

[0032] To facilitate resistance adjustment by the inner magnet 17, an air gap is provided between the inner wall of the receiving cavity 22 and the inner magnetic assembly 1. Several magnets 17 are disposed on the outermost side of the inner magnetic assembly 1. The inner magnetic assembly 1 also includes an adjustment mechanism connected to the magnets 17, which drives the magnets 17 to move away from or closer to the inner wall of the receiving cavity 22. The adjustment mechanism controls the magnetic field strength by changing the air gap distance between the magnets 17 and the flywheel, thereby adjusting the resistance.

[0033] The internal magnetic component 1 has the following structure: it includes a fixed frame 13, and the adjustment mechanism includes an arc-shaped iron plate 16, an adjusting steel wire 14, and several support columns 15. The support columns 15 are located inside the fixed frame 13 and fixedly connected to both sides of the fixed frame 13. The adjusting steel wire 14 passes around the support column 15 and connects to one end of the arc-shaped iron plate 16. The other end of the arc-shaped iron plate 16 is provided with a hook part 161, which engages with the two side walls of the fixed frame 13. Each arc-shaped iron plate 16 is provided with several magnets 17. The adjusting steel wire 14, using the support column 15 as a fulcrum, pulls the arc-shaped iron plate 16 to deform and change the position of the magnets 17, thereby adjusting the air gap. The structure is compact, and the adjustment accuracy is high; the arc-shaped design ensures that the magnets 17 are evenly distributed, improving the stability of the magnetic field. Furthermore, a reset spring 18 is provided on the inner side of the arc-shaped iron plate 16. The reset spring 18 abuts against the arc-shaped iron plate 16 and provides the arc-shaped iron plate 16 with a force to move towards the inner wall of the receiving cavity 22. The reset spring 18 balances the tension of the adjusting steel wire 14 to ensure that the magnet 17 automatically resets.

[0034] Preferably, the counterweight flywheel 2 has a radius of 100-150mm, and the fan blade 3 has a length of 30-60mm. The flywheel radius conforms to ergonomics, and the fan blade 3 length optimizes aerodynamic performance. This example uses a counterweight flywheel 2 with a radius of 130mm and a fan blade 3 length of 50mm, with an overall radius within 180mm, reducing the size of the exercise bike and making it more suitable for home use. The smaller flywheel reduces the overall weight and makes it easier to move; the fan blade 3 size matches the flywheel to ensure wind coverage.

[0035] To stabilize resistance and generate a larger airflow, the plane of the fan blade 3 does not pass through the center of the counterweight flywheel 2; instead, the plane of the fan blade 3 is tilted towards the rotation direction of the counterweight flywheel 2. This tilting of the fan blade 3 utilizes Bernoulli's principle to guide airflow more efficiently. This increases wind power output and reduces energy loss; the tilt angle optimizes airflow direction and improves heat dissipation efficiency.

[0036] Preferably, to ensure stable connection, a recessed groove 11 is provided on the outer side of the inner magnetic component 1, and a reinforcing connecting seat 12 is provided at the center of the recessed groove 11. The mounting spindle 4 passes through the reinforcing connecting seat 12 and is fixedly connected to it. The reinforcing connecting seat 12 is provided with a connecting plane, and the connecting plane is fixedly connected to the fixing frame 13. To reduce the overall weight, the fixing frame 13 is made of plastic, effectively reducing the overall weight. The recessed groove 11 design further reduces the weight, while providing an installation position for the reinforcing connecting seat 12, thus reducing the lateral width of the bicycle. The connection between the connecting plane of the reinforcing connecting seat 12 and the fixing frame 13 avoids stress concentration in the plastic parts, making the fixing frame 13 less prone to damage and improving the overall structural rigidity.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the article or apparatus that includes that element.

[0038] The above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. The utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A small flywheel for a stationary bike, characterized in that: It includes an internal magnetic assembly, a mounting spindle, a counterweight flywheel, and several fan blades. The mounting spindle is used to fix it to the frame. The internal magnetic assembly is fixed on the mounting spindle. The counterweight flywheel is rotatably mounted on the mounting spindle. A receiving cavity is provided on one side of the counterweight flywheel, and the internal magnetic assembly is located in the receiving cavity. A counterweight ring is provided at the center of the outer side of the counterweight flywheel. The fan blade includes a bent part and a fan surface. One side of the bent part is in contact with the side of the counterweight ring. The bent part and the counterweight ring are connected by screws. The fan surface is arranged along the width direction of the counterweight flywheel.

2. The small flywheel for a stationary bike as described in claim 1, characterized in that: The fan blade is integrally formed, and a cutting groove is provided in the middle of the lower side of the fan blade. The length of the cutting groove is greater than half the width of the fan blade. The area below the cutting groove is bent to form the bent part, and the remaining part is the fan blade part. The bent part is perpendicular to the fan surface.

3. The small flywheel for a stationary bike as described in claim 1, characterized in that: The counterweight flywheel has a connecting inner disc on the side away from the inner magnetic component. A bearing sleeve is located at the center of the connecting inner disc. A pulley is located on the outside of the bearing sleeve. The pulley is used to connect and drive with the foot pedal wheel. The bearing sleeve contains a bearing, and the mounting spindle is installed in the bearing.

4. The small flywheel for a stationary bike as described in claim 3, characterized in that: The inner connecting plate is provided with several center of gravity adjustment holes.

5. The small flywheel for a stationary bike as described in claim 1, characterized in that: An air gap is provided between the inner wall of the receiving cavity and the inner magnetic assembly. Several magnets are provided on the outermost side of the inner magnetic assembly. The inner magnetic assembly is also provided with an adjustment mechanism, which is connected to the magnets and drives the magnets to move away from or closer to the inner wall of the receiving cavity.

6. The small flywheel for a stationary bike as described in claim 5, characterized in that: The internal magnetic component includes a fixed frame, and the adjustment mechanism includes an arc-shaped iron plate, an adjustment steel wire, and several support columns. The support columns are located inside the fixed frame and are fixedly connected to both sides of the fixed frame. The adjustment steel wire passes around the support columns and is connected to one end of the arc-shaped iron plate. The other end of the arc-shaped iron plate is provided with a hook part, which is engaged with the two side walls of the fixed frame. Several magnets are provided on each arc-shaped iron plate.

7. The small flywheel for a stationary bike as described in claim 6, characterized in that: A return spring is provided on the inner side of the arc-shaped iron plate. The return spring abuts against the arc-shaped iron plate and provides a force to the arc-shaped iron plate to move towards the inner wall of the receiving cavity.

8. The small flywheel for a stationary bike as described in claim 1, characterized in that: The counterweight flywheel has a radius of 100-150mm and a blade length of 30-60mm.

9. The small flywheel for a stationary bike as described in claim 1, characterized in that: The plane containing the fan blades does not pass through the center of the counterweight flywheel, and the plane of the fan blades is inclined in the direction of rotation of the counterweight flywheel.

10. The small flywheel for a stationary bike as described in claim 6, characterized in that: The inner magnetic component has a recessed groove on its outer side, and a reinforcing connecting seat is provided at the center of the recessed groove. The mounting spindle passes through the reinforcing connecting seat and is fixedly connected to it. The reinforcing connecting seat has a connecting plane, and the connecting plane is fixedly connected to the fixing frame.

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