CN215995467U - Exercise bicycle and flywheel structure thereof - Google Patents

Abstract

The utility model relates to the technical field of fitness equipment, in particular to a fitness bike and a flywheel structure thereof. The magnetic control assembly is positioned in the groove and has magnetic attraction with the peripheral wall of the groove; one end of the wheel shaft is connected with the inertia wheel, the other end of the wheel shaft forms a driven end and is driven by the driving wheel to rotate, and the wheel shaft is linked with the inertia wheel; the magnetic control assembly is externally connected with an input power supply, the magnitude of the current of the input power supply is changed, and the magnetic attraction between the magnetic control assembly and the peripheral wall of the groove can be increased or reduced. In the technical scheme, the magnetic control assembly is arranged in the groove of the inertia wheel, so that the space can be greatly saved, and the appearance looks neat and elegant; the magnetic control assembly has magnetism and can attract the inertia wheel, the magnetic control assembly is connected with a power supply, the larger the current input into the magnetic control assembly is, the larger the magnetic field intensity is, the stronger the magnetism is, and the stronger the attraction force to the inertia wheel is.

Description

Exercise bicycle and flywheel structure thereof

Technical Field

The utility model relates to the technical field of fitness equipment, in particular to a fitness bike and a flywheel structure thereof.

Background

The magnetic control exercise bicycle is characterized in that magnets are arranged on the periphery of a metal flywheel generating resistance and are close to each other, and the requirements of different exercise strengths are met by adjusting the distance between the magnets and a metal inertia wheel and adjusting the resistance in a manual knob wire pulling mode. The distance between the two magnets is adjusted, so that loss caused by friction resistance adjustment is avoided, the service life of the exercise bicycle is prolonged, and resistance can be more uniform.

Compared with the common exercise bicycle, the magnetic control exercise bicycle has the advantages of small abrasion, uniform force application and durability, and the household exercise is also more common magnetic control exercise bicycles. It has become one of the popular fitness equipments purchased by families. The motion principle of the device is that the resistance is controlled by the magnetic control wheel, so that the purpose of adjusting the motion intensity is achieved.

However, the pull wire of the manual knob of the existing magnetic control exercise bicycle is easy to break, and the periphery of the magnet occupies relatively more space; in addition, the existing material of the metal flywheel is basically an iron casting, the exercise bicycle is a device used for a long time, and the iron inertia wheel is easy to crack after being used for a long time.

Disclosure of Invention

In order to solve the above problems, a first object of the present invention is to provide a flywheel structure, which reduces the occupied space of the flywheel as much as possible, increases the aesthetic property, and uses a steel flywheel to enhance the toughness and stability and prolong the service life of the device; the second purpose of the present invention is to provide an exercise bicycle having the above flywheel structure.

In order to achieve the purpose, the utility model adopts the following technical scheme: including flywheel, shaft and magnetic control subassembly, its characterized in that: a groove is formed in one side of the inertia wheel, the magnetic control assembly is positioned in the groove, and magnetic attraction is formed between the magnetic control assembly and the peripheral wall of the groove; one end of the wheel shaft is connected with the inertia wheel, the other end of the wheel shaft forms a driven end and is driven by the driving wheel to rotate, and the wheel shaft is linked with the inertia wheel; the magnetic control assembly is externally connected with an input power supply, the magnitude of the current of the input power supply is changed, and the magnetic attraction between the magnetic control assembly and the peripheral wall of the groove can be increased or reduced. In the technical scheme, the magnetic control assembly is arranged in the groove of the inertia wheel, so that the space can be greatly saved, and the appearance looks neat and elegant; the magnetic control assembly has magnetism and can attract the inertia wheel, and meanwhile, the magnetic control assembly is connected with a power supply, the larger the current input into the magnetic control assembly is, the stronger the magnetic field intensity is, the stronger the attraction force on the inertia wheel is, the harder the driving wheel drives the inertia wheel to rotate, and the driving wheel is driven manually; the user can use the exercise bicycle to exercise better and more conveniently in a quicker control mode.

Preferably, the plurality of groups of magnetic control assemblies are circumferentially and regularly arranged in the groove of the inertia wheel, and the plurality of groups of magnetic control assemblies are fixedly arranged on a support to form a whole. In the technical scheme, the support plays a role in stabilizing multiple groups of magnetic control assemblies, and the multiple groups of magnetic control assemblies which are regularly arranged in the circumferential direction are used for enabling the magnetic attraction force of the whole formed by the magnetic control assemblies to all directions of the inertia wheel to be more uniform, so that the inertia wheel is ensured to rotate along the wheel center of the inertia wheel and the center of the whole formed by the multiple groups of magnetic control assemblies; in addition, the inertia wheel can effectively prevent the loss of the wheel axle bending and the like caused by the overlarge attraction force to one side of the inertia wheel and the long-term use.

Preferably, the magnetic control component comprises a magnet, a coil and a nylon sleeve; the cross section of the magnet is in a shape of Chinese character 'shan', the nylon sleeve is sleeved in the middle of the magnet, and a fixed shaft is inserted above the nylon sleeve on the magnet and used for preventing the nylon sleeve from being separated from the magnet; the coil is coiled on the nylon sleeve, and two ends of the coil are connected with plugs and used for being connected with an input power supply. In the technical scheme, the coil is wound on the magnet, an electromagnetic field is generated after the coil is electrified, and the shape of the magnet can effectively prevent the nylon sleeve from being separated; and the arrangement of the nylon sleeve is convenient for winding the coil and prevents the coil from being loosened and separated after long-time use.

Preferably, the center of the groove extends towards the direction of the magnetic control assembly to form a shaft column, a plurality of bearings are sleeved on the wheel shaft, one end of the wheel shaft is inserted into the shaft column, and the other end of the wheel shaft is sleeved with a belt ring. In the technical scheme, the wheel shaft is connected with the inertia wheel in a linkage mode through being inserted into the shaft column, the bearing prevents the wheel shaft from being abraded and facilitates the rotation of the wheel shaft, and the belt ring is used for connecting the driving end to enable the wheel shaft and the inertia wheel to be driven to rotate.

Preferably, the inertia wheel is a steel casting. In the technical scheme, the strength of the steel casting is better than that of the iron casting, and the service life of the inertia wheel can be prolonged.

The exercise bicycle comprises the flywheel structure and a frame, wherein the whole body formed by the multiple groups of magnetic control assemblies is fixedly arranged on the frame, a socket corresponding to the belt ring is arranged on the frame, and the belt ring is inserted into the socket and is driven to rotate by a driving wheel above the belt ring.

Drawings

Fig. 1 is a schematic perspective view of a structure of a exercise bicycle with a leg tube adjusting structure and a flywheel structure.

Fig. 2 is a schematic view of the assembly of the flywheel and the axle of an exercise bicycle.

Fig. 3 is a schematic view of the assembly of multiple sets of magnetic control components of an exercise bicycle.

Fig. 4 is an exploded view of the flywheel and axle mounting of an exercise bicycle.

Fig. 5 is an assembly view of multiple sets of magnetic control assemblies and inertia wheels of an exercise bicycle.

FIG. 6 is an exploded view of the magnetic assemblies of the exercise device.

Fig. 7 is an overall assembly schematic diagram of a plurality of sets of magnetic control components of an exercise bicycle.

Fig. 8 is a schematic perspective view of the leg tube of the exercise bicycle in an unfolded state.

Fig. 9 is a schematic perspective view of a closed exercise bicycle.

Figure 10 is an exploded view of an adjustment assembly on the foot tube of an exercise bicycle.

Fig. 11 is a schematic perspective view of a leg tube with legs of an exercise bicycle.

Figure 12 is a cross-sectional view of a foot tube with feet of an exercise bicycle.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

An exercise apparatus as shown in figures 1-11 is provided with both a foot tube adjustment structure and a flywheel structure.

As shown in fig. 1-7, the flywheel structure specifically includes an inertia wheel 14, a wheel shaft 15, and a magnetic control assembly 16, wherein a groove 17 is formed on one side of the inertia wheel 14, and the magnetic control assembly 16 is located in the groove 17 and has a magnetic attraction force with a peripheral wall of the groove 17; one end of the wheel shaft 15 is connected with the inertia wheel 14, the other end of the wheel shaft 15 forms a driven end and is driven by the driving wheel 18 to rotate, and the wheel shaft 15 is linked with the inertia wheel 14; the magnetron assembly 16 is externally connected with an input power supply, and the magnetic attraction between the magnetron assembly 16 and the peripheral wall of the groove 17 can be increased or reduced by changing the current magnitude of the input power supply. In the technical scheme, the magnetic control assembly 16 is arranged in the groove 17 of the inertia wheel 14, so that the space can be greatly saved, and the appearance looks neat and elegant; the magnetic control component 16 has magnetism and can attract the inertia wheel 14, meanwhile, the magnetic control component 16 is connected with a power supply, the larger the current input into the magnetic control component 16 is, the stronger the magnetic field intensity is, the stronger the attraction force to the inertia wheel 14 is, the more difficult the driving wheel 18 drives the inertia wheel 14 to rotate, and the driving wheel 18 is driven manually; the user can use the exercise bicycle to exercise better and more conveniently in a quicker control mode.

Furthermore, there are multiple sets of magnetron assemblies 16 regularly arranged in the circumferential direction in the groove 17 of the inertia wheel 14, and the multiple sets of magnetron assemblies 16 are all fixedly arranged on a support 28 to form a whole. In the technical scheme, the support 28 plays a role in stabilizing the plurality of groups of magnetic control assemblies 16, and the plurality of groups of magnetic control assemblies 16 which are regularly arranged in the circumferential direction are used for making the magnetic attraction force of the whole formed by the magnetic control assemblies 16 to each direction of the inertia wheel 14 more uniform, so as to ensure that the inertia wheel 14 rotates along the wheel center of the inertia wheel 14 and the center of the whole formed by the plurality of groups of magnetic control assemblies 16; further, it is possible to effectively prevent the loss of the wheel shaft 15, such as bending, which may occur due to the excessive attraction force to one side of the flywheel 14.

Further, the magnetron assembly 16 includes a magnet 19, a coil 20, and a nylon sleeve 21; the section of the magnet 19 is in a shape of Chinese character 'shan', and the nylon sleeve 21 is sleeved in the middle of the magnet 19; a fixed shaft 22 is inserted above the nylon sleeve 21 on the magnet 19 and is used for preventing the nylon sleeve 21 from being separated from the magnet 19; the coil 20 is wound on a nylon sleeve 21, and two ends of the coil are connected with plugs 23 for connecting an input power supply. In the technical scheme, the coil 20 is wound on the magnet 19, an electromagnetic field is generated after the coil 20 is electrified, and the shape of the magnet 19 can effectively prevent the nylon sleeve 21 from being separated; the nylon cover 21 is provided to facilitate winding of the coil 20 and to prevent the coil 20 from being released after a long period of use. In addition, only one coil 20 is plotted in fig. 6 as an example.

Furthermore, the center of the groove 17 extends towards the direction of the magnetic control assembly 16 to be provided with a shaft column 24, the wheel shaft 15 is sleeved with a plurality of bearings 25, one end of the wheel shaft 15 is inserted into the shaft column 24, and the other end of the wheel shaft is sleeved with a belt ring 26. In the technical scheme, the wheel shaft 15 is connected with the inertia wheel 14 in an inserting mode on the shaft column 24, the bearing 25 prevents the wheel shaft 15 from being abraded and facilitates the rotation of the wheel shaft 15, and the belt ring 26 is used for connecting the driving end, so that the wheel shaft 15 and the inertia wheel 14 can be driven to rotate.

Further, the flywheel 14 is a steel casting. In the technical scheme, the strength of the steel casting is better than that of the iron casting, and the service life of the inertia wheel 14 can be prolonged.

As shown in fig. 8-12, the present invention specifically relates to a foot tube adjusting structure, which comprises a frame 1 and two foot tubes 3, wherein a foot rest 2 is fixedly disposed at the rear end of the frame 1, one ends of the two foot tubes 3 are respectively hinged to two sides of the foot rest 2, and the other ends are fixedly provided with support legs 4;

the foot tube 3 can rotate along the hinge point and is positioned in an unfolded or folded state relative to the frame 1;

the foot tube 3 is in an unfolded state relative to the frame 1, the foot tube 3 rotates to the rear of the frame 1 along the hinged end, and the support leg 4 stands at the rear side of the frame 1;

the foot tube 3 is in a furled state relative to the frame 1, the foot tube 3 rotates to the side of the frame 1 along the hinged end, and the support leg 4 is close to the front end of the frame 1.

In the technical scheme, the foot tube 3 can rotate relative to the frame 1 and is in an unfolded or folded state relative to the frame 1; when the bicycle frame is unfolded, the two foot tubes 3 rotate simultaneously, and compared with the existing structure, the moment arm is longer, so that the stability of the bicycle frame 1 is better; when the exercise bicycle is folded, the foot tubes 3 can be folded to the side edges of the frame 1, so that the floor area of the exercise bicycle is reduced to the maximum extent, and the space is saved; in addition, when the foot tube 3 is in the unfolding or folding state, the foot tube 3 can be fixed relative to the frame 1, and the inconvenience of normal use and storage of the exercise bicycle is not influenced.

Furthermore, the foot tube 3 is provided with an adjusting component which can be matched with the foot rest 2 to lock the foot tube 3 relative to the frame 1. In the technical scheme, the adjusting component is arranged on the foot tube, the foot tube 3 rotates along the foot rest 2, and the foot tube 3 can be locked as long as the adjusting component is fixed relative to the foot rest 2.

Furthermore, the adjusting component at least comprises a lock rod 5, the foot rest 2 is provided with a plurality of limiting holes 6, the limiting holes 6 are distributed on the lock rod 5 along the rotating track of the hinged point of the foot tube 3 and the foot rest 2, and the lock rod 5 can be inserted into the limiting holes 6 to lock the foot tube 3 relative to the foot rest 2. In the technical scheme, the mode that the lock rod 5 is inserted into the limiting hole 6 can effectively limit the movement of the lock rod 5 in the horizontal direction and prevent the lock rod 5 from being disengaged in the horizontal direction; since the lock lever 5 is a part of the adjusting assembly which is disposed on the leg tube 3, when the lock lever 5 is restricted from being locked, the movement of the adjusting assembly in the horizontal direction is restricted, so that the rotation path of the leg tube 3 is restricted.

Further, the adjusting assembly also comprises a vertical shaft 7, a transverse shaft 8 arranged above the vertical shaft 7, and a pressing sheet 9 inserted with the transverse shaft 8; the pin tube 3 is provided with a vertical through hole 10, and the cross shaft 8 is provided with a threaded hole 11; the vertical shaft 7 is inserted into the through hole 10 and extends out of two end faces of the foot tube 3, the lock rod 5 penetrates through the vertical shaft 7, the upper end of the lock rod is embedded into the pressing sheet 9 and is in threaded connection with the transverse shaft 8, and the lower end of the lock rod extends out of the vertical shaft 7 and is inserted into the limiting hole 6 to lock the foot tube 3. In the technical scheme, the vertical shaft 7 in the adjusting component is arranged in the foot tube 3 in a penetrating way, so that the adjusting component can be effectively prevented from being separated from the foot tube 3, the locking rod 5 is arranged in the vertical shaft 7 in a penetrating way, and after the locking rod 5 is limited and locked, the stability of the adjusting component and the foot tube 3 can be kept to the maximum extent; the pressing sheet 9 is arranged to limit the displacement of the transverse shaft 8, and the locking rod 5 which is in threaded connection with the transverse shaft 8 can be driven by the transverse shaft 8 to move longitudinally as the movement of the adjusting assembly in the horizontal direction is limited; in addition, the pressing sheet 9 can cover the through hole 10, so that the whole pin tube 3 has aesthetic property.

Furthermore, a spring 12 is sleeved on the lock rod 5, the pressing sheet 9 is lifted by acting force, the transverse shaft 8 moves upwards and drives the lock rod 5 to move upwards to enable the lower end of the lock rod 5 to move out of the limiting hole 6, the foot tube 3 can rotate freely, and the spring 12 is in a deformation state; the foot tube 3 moves to the upper part of the other limit hole 6, the pressing sheet 9 is loosened, and the spring 12 acts on the lock rod 5 to pull downwards so that the lower end of the lock rod is embedded into the limit hole 6. In the technical scheme, it should be mentioned here that the third function of the pressing sheet 9 is to serve as an acting point, and the lifting of the pressing sheet 9 can drive the transverse shaft 8 to move longitudinally, so that the locking rod 5 can be disengaged from the limiting hole 6 by moving longitudinally, and can be rotated to the position above the other limiting hole 6 and be pulled downwards by the spring. It should be noted that, below the cross shaft 8, a protruding column is formed on the pressing sheet 9 and presses against the vertical shaft 7, and the pressing sheet 9 and the pressing end form a lever, so that the locking lever 5 can be easily driven to move upwards when one side of the pressing sheet 9 is lifted, thereby increasing convenience.

Further, the inner diameter of the lower end of the vertical shaft 7 > the outer diameter of the lower end of the lock lever 5 > the diameter of the spring 12 > the inner diameter of the upper end of the vertical shaft 7 > the outer diameter of the upper end of the lock lever 5. In the technical scheme, the reason that the outer diameter of the lower end of the lock rod 5 is larger than the inner diameter of the upper end of the vertical shaft 7 is to prevent the lock rod 5 from being separated from the vertical shaft 7 in the lifting process; because the outer diameter of the lower end of the lock rod 5 is larger than the diameter of the spring 12 and the inner diameter of the upper end of the vertical shaft 7, the spring 12 is pressed to deform and has downward elastic force on the lock rod 5 in the lifting process of the lock rod 5, and the lock rod 5 can automatically move downwards and be inserted into the limiting hole 6 after the pressing sheet 9 is released.

Further, the foot tube 3 is curved, and when the foot tube is folded relative to the frame 1, a part of the foot tube 3 is placed parallel to the frame 1. In this technical scheme, when foot pipe 3 is the state of drawing in, the curved foot pipe 3 is better than the effect of accomodating of straight tube type, and the space of saving is big more.

Furthermore, a stop 13 extends upwards from the edge of the lower end face of the foot stand 2, and the stop 13 is positioned in the motion track of the foot tube 3. In the technical scheme, the stop block 13 is arranged to prevent the foot tubes 3 from moving too much to collide with the frame 1 when being folded, so that equipment is protected better.

In this embodiment, the side of the frame 1 of the exercise bike is fixed with a whole formed by multiple sets of magnetic control assemblies 16, the whole is covered with an inertia wheel 14, and the inertia wheel 14 is inserted into a corresponding socket 27 through a belt loop 26 on the wheel shaft 15 to be linked with the driving wheel 18. The rear end of the frame 1 is movably connected with two foot tubes 3.

When a user uses the exercise bicycle to exercise, the two foot tubes 3 are unfolded, and the lock rod 5 is inserted into the limiting hole 6 to be locked; the plurality of groups of magnetic control assemblies 16 have magnetic property and attract the inertia wheel 14, a user treads the pedal to enable the driving wheel 18 to rotate and drive the inertia wheel 14 to rotate, and the inertia wheel 14 is attracted by the magnetic control assemblies 16, so that the user has resistance when treading; the power supply is started to electrify the exercise bicycle, at the moment, current flows into the coil 20, the current is controlled to be increased by a user through a key on the front display, the magnetism of the magnet 19 is enhanced, the suction force on the inertia wheel 14 is increased, the user can more difficultly step on the driving wheel 18 to drive the inertia wheel 14 to rotate, and the purpose of exercising the body is achieved; on the contrary, when the current is reduced, the magnetic attraction effect is reduced, and the stepping is smoother.

After the user has taken exercise, want to pack up two foot pipes 3, make the area of exercise bicycle diminish, save space, then stir preforming 9 upwards, 8 rebound of cross axle and drive locking lever 5 and shift out from spacing hole 6, stir the posture of preforming 9 unchangeably, it 3 to another spacing hole 6 tops to rotate foot pipe again, put preforming 9, then spring 12 pulls locking lever 5 downwards and inserts in this spacing hole 6, preforming 9 resets simultaneously, two foot pipes 3 rotate to the both sides of frame 1, the occupation of land space has been saved greatly, make exercise bicycle be convenient for accomodate.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

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, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.

Claims (6)

1. A flywheel structure comprising an inertia wheel (14), a wheel axle (15) and a magnetically controlled assembly (16), characterized in that:

a groove (17) is formed in one side of the inertia wheel (14), the magnetic control assembly (16) is located in the groove (17), and magnetic attraction force is formed between the magnetic control assembly and the peripheral wall of the groove (17); one end of the wheel shaft (15) is connected with the inertia wheel (14), the other end of the wheel shaft forms a driven end and is driven by the driving wheel (18) to rotate, and the wheel shaft (15) is linked with the inertia wheel (14);

the magnetic control assembly (16) is externally connected with an input power supply, the magnitude of the current of the input power supply is changed, and the magnetic attraction between the magnetic control assembly (16) and the peripheral wall of the groove (17) can be increased or reduced.

2. A flywheel construction as claimed in claim 1, wherein: the magnetic control assemblies (16) are provided with a plurality of groups and are circumferentially and regularly arranged in the grooves (17) of the inertia wheel (14), and the plurality of groups of magnetic control assemblies (16) are all fixedly arranged on a support (28) to form a whole.

3. A flywheel construction according to claim 2 wherein: the magnetic control assembly (16) comprises a magnet (19), a coil (20) and a nylon sleeve (21); the cross section of the magnet (19) is in a shape of Chinese character 'shan', the nylon sleeve (21) is sleeved in the middle of the magnet (19), and a fixed shaft (22) is inserted above the nylon sleeve (21) on the magnet (19) and used for preventing the nylon sleeve (21) from being separated from the magnet (19);

the coil (20) is wound on the nylon sleeve (21), and two ends of the coil (20) are connected with plugs (23) for connecting an input power supply.

4. A flywheel construction according to claim 2 wherein: the center of recess (17) is equipped with jack-post (24) to the direction extension of magnetic control subassembly (16), the cover is equipped with a plurality of bearings (25) on shaft (15), the one end of shaft (15) is pegged graft on jack-post (24), and another pot head is equipped with belt circle (26).

5. A flywheel construction as claimed in claim 1 or 2, wherein: the inertia wheel (14) is a steel casting.

6. An exercise bike comprising a flywheel construction according to any of claims 1 to 5, characterised in that: still include frame (1), the monolithic stationary setting that multiunit magnetic control subassembly (16) formed is on frame (1), be equipped with socket (27) that correspond with belt loop (26) on frame (1), belt loop (26) insert in socket (27) and by the drive wheel (18) drive rotation of top.

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