Resistance adjusting mechanism and exercise bicycle with same

Abstract

The utility model provides a resistance adjusting mechanism and an exercise bicycle with the same, the resistance adjusting mechanism comprises a brake assembly, the brake assembly comprises a brake seat and a contact medium arranged on the bottom surface of the brake seat, one end of the brake seat is hinged on a frame on one side of a resistance wheel, and the other end of the brake seat is a movable end; the adjusting assembly comprises a screw cap, a screw shaft with an external thread and a screw sleeve with an internal thread, and the screw sleeve is fixed to the frame so that the screw shaft can movably make contact with the top face of the brake seat in the thread rotating process of the screw shaft; the elastic assembly is used for converting direct contact between the spiral shaft and the top face of the brake seat into elastic contact, the resistance adjusting mechanism solves the problems of force application uniformity and balanced abrasion existing in resistance adjustment in a traditional exercise bicycle, and better user experience and equipment durability are provided.

Description

Technical Field

[0001] The utility model relates to the technical field of resistance adjusting mechanisms, in particular to a resistance adjusting mechanism and an exercise bike with such a mechanism. Background Art

[0002] As one of the common training equipment in gyms, the exercise bike is favored by weight loss and fitness enthusiasts because of its efficient fat burning effect. Traditional exercise bikes usually use a damping mechanism to simulate the resistance during cycling. For example, felt pads or wear-resistant rubber materials are used as contact media, and the pressure of the brake assembly is adjusted to change the contact degree between these materials and the surface of the flywheel, thereby adjusting the magnitude of the generated frictional resistance. The advantage of this mechanical resistance adjustment mechanism is mainly reflected in its low cost.

[0003] However, this resistance adjustment method in the prior art has some limitations. Specifically, the direct pressing between the brake assembly and the contact medium (such as a felt pad) causes an uneven pressure distribution on the surface of the flywheel, especially the pressure at the contact point is too large. This not only accelerates the local wear of the contact medium, but also may cause uneven wear of the flywheel surface, thereby affecting the overall performance and service life of the exercise bike. Therefore, it is particularly important to develop a new resistance adjustment system that can apply pressure more evenly, reduce wear and extend the service life of the equipment.

[0004] In view of this, the inventor of the present case specifically designed a resistance adjusting mechanism and an exercise bike with such a mechanism, and thus this case was generated. Summary of the Utility Model

[0005] In order to solve the above problems, one of the technical solutions of the present utility model is as follows:

[0006] A resistance adjusting mechanism, comprising:

[0007] A brake assembly, including a brake seat and a contact medium provided on the bottom surface of the brake seat, one end of the brake seat is hinged to the frame on one side of the resistance wheel and the other end is a movable end;

[0008] An adjusting assembly, including a screw cap, a spiral shaft with an external thread, and a spiral sleeve with an internal thread, the spiral sleeve is fixed to the frame so that the spiral shaft can be in movable contact with the top surface of the brake seat as the thread rotates;

[0009] An elastic assembly, used to convert the direct contact between the spiral shaft and the top surface of the brake seat into elastic contact.

[0010] Preferably, the brake seat includes an arc-shaped base and a contact portion integrally provided at the upper end of the middle of the base, a connecting piece is provided on one side of the contact portion and on the upper end surface of the base, and a hinge hole parallel to the axial direction of the resistance wheel is provided through the connecting piece.

[0011] Preferably, the connecting piece includes a pair of side walls parallelly distributed on the upper end surface of the base and a connecting wall connecting the same sides of the two side walls. The other sides of the two side walls away from the connecting wall are integrally connected to the side wall of the contact part. The hinge holes are penetrated and formed on the two side walls, and a plurality of reinforcing ribs are arranged between the two side walls.

[0012] Preferably, the contact part is recessed inward along the side away from the base to form an installation groove. Hollow grooves are symmetrically formed on both sides of the installation groove along the extending direction of the arc surface of the base. The hollow grooves integrally extend upward along their bottoms to form clamping parts, and the tops of the clamping parts extend to the top surface of the contact part and protrude inwardly towards the installation groove to form claw parts.

[0013] Preferably, the elastic component includes a contact plate and a contact spring. The size and shape of the contact plate are adapted to the cross-section of the installation groove. After the contact plate is clamped into the installation groove, it is elastically contacted with the bottom surface of the installation groove through the contact spring. The contact spring pushes the contact plate upward to limit it between the claw part and the top end of the contact spring.

[0014] Preferably, a limiting groove distributed along the length direction is recessed on the top surface of the contact plate. The limiting groove is opposite to the position of the spiral shaft and the width of the limiting groove is adapted to the diameter of the spiral shaft.

[0015] Preferably, the bottom of the contact plate protrudes to form an upper positioning part adapted to the shape of the limiting groove along with the depression of the limiting groove. A limiting structure is arranged at the center of the bottom surface of the installation groove. The upper and lower ends of the contact spring are respectively limited and sleeved on the outer peripheral side of the upper positioning part and the outer peripheral side of the limiting structure.

[0016] Preferably, the limiting structure is a convex columnar protrusion or a concave columnar positioning groove.

[0017] Preferably, the contact spring is a conical spring. The upper and lower ends of the conical spring respectively have a first contact end with a larger opening and a second contact end with a smaller opening. The first contact end is limited and sleeved with the upper positioning part, and the second contact end is limited and connected with the limiting structure.

[0018] The second technical solution of the present utility model is as follows:

[0019] An exercise bike with a resistance adjustment mechanism includes a frame, a resistance wheel, and a pedal assembly for driving the resistance wheel. The resistance of the resistance wheel is adjusted by a resistance mechanism arranged on the frame.

[0020] The beneficial effects of the present utility model are as follows:

[0021] First, the utility model ensures a more uniform pressure between the contact medium and the surface of the resistance wheel through the elastic component, avoiding the problem of local excessive wear. And due to the more uniform pressure distribution, the wear of the contact medium and the resistance wheel will be more uniform, thus extending their service life.

[0022] Secondly, through the adjusting nut and the screw shaft in the adjusting component, the user can easily adjust the resistance according to needs, and the operation is simple.

[0023] In addition, the brake seat includes an arc-shaped base and a connecting piece, enhancing the stability and strength of the whole structure. At the same time, the reinforcing ribs on the connecting piece further improve the reliability of the structure.

[0024] In addition, the installation groove provides sufficient space for the contact plate and the contact spring to be compressed and deformed. Under different force applications and adjustments, the pressure transmitted by the contact spring to the bottom of the installation groove is also different, so that the pressure of the adjusting component can be fully transmitted to the brake seat.

[0025] In addition, using a conical spring as the contact spring can achieve different levels of resistance adjustment according to different compression states of the spring, improving the accuracy of resistance control.

[0026] Particularly, this resistance adjustment mechanism can be applied to various types of fitness bikes, increasing the versatility and market competitiveness of the product.

[0027] In summary, the resistance adjustment mechanism proposed by the utility model overcomes the problems of force application uniformity and balanced wear existing in the resistance adjustment of traditional fitness bikes, providing a better user experience and equipment durability. Brief Description of the Drawings

[0028] The drawings described herein are used to provide a further understanding of the utility model and constitute a part of the utility model. The schematic embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an improper limitation of the utility model.

[0029] Among them:

[0030] Figure 1 is a schematic three-dimensional structure diagram of the fitness bike in the utility model;

[0031] Figure 2 is Figure 1 a partial enlarged structure diagram of area A in

[0032] Figure 3 is a schematic installation structure diagram of Embodiment 1 of the utility model;

[0033] Figure 4 is a schematic cross-sectional installation structure diagram of Embodiment 1 of the utility model;

[0034] Figure 5 It is a three-dimensional explosion structure schematic diagram of the first embodiment of the present utility model;

[0035] Figure 6 It is a three-dimensional structure schematic diagram of the brake seat in the first embodiment of the present utility model;

[0036] Figure 7 It is a three-dimensional sectional structure schematic diagram of the contact plate in the first embodiment of the present utility model;

[0037] Figure 8 It is a three-dimensional structure schematic diagram of the contact plate in the first embodiment of the present utility model.

[0038] Label description:

[0039] 10. Brake assembly; 20. Brake seat; 21. Base; 22. Contact part; 221. Installation groove; 222. Hollow groove; 223. Clamping part; 224. Claw part; 225. Limiting structure; 23. Connecting piece; 231. Side wall; 232. Connecting wall; 233. Reinforcing rib; 24. Hinge hole; 25. Connecting piece; 251. Side plate; 252. Top plate; 253. Installation hole; 30. Contact medium; 40. Adjusting assembly; 41. Knurled nut; 42. Screw shaft; 43. Screw sleeve; 50. Elastic assembly; 51. Contact plate; 511. Limiting groove; 512. Upper positioning part; 52. Contact spring; 60. Frame; 70. Pedal assembly; 71. Pedal part; 72. Transmission mechanism; 80. Resistance wheel; 90. Crank tube; 91. Link assembly. Specific embodiments

[0040] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0041] Embodiment 1

[0042] Please refer to Figures 1 to 8 , which is a resistance adjusting mechanism as the best embodiment of the present utility model, including:

[0043] Brake assembly 10, including brake seat 20 and contact medium 30 provided on the bottom surface of brake seat 20. One end of brake seat 20 is hinged to frame 60 on one side of resistance wheel 80 and the other end is a movable end;

[0044] In this embodiment, the contact medium 30 can be selected as a felt pad, wear-resistant rubber material, etc. In this embodiment, a felt pad is specifically selected and pasted or clamped and fixed on the bottom surface of the brake seat 20, so that by pressing the brake seat 20, the felt pad can be tightly attached to the outer peripheral surface of the resistance wheel 80 of the fitness bike with different forces, thereby generating different resistance magnitudes.

[0045] The adjusting assembly 40 includes a screw cap 41, a screw shaft 42 with an external thread, and a screw sleeve 43 with an internal thread. The screw sleeve 43 is fixed to the frame 60 so that the screw shaft 42 can be in movable contact with the top surface of the brake seat 20 during the process of its threaded rotation;

[0046] Specifically, the screw sleeve 43 is generally fixed on the frame 60 of the fitness bike closest to the resistance wheel 80 and is inclined towards the outer peripheral wheel surface of the resistance wheel 80. The internal thread of the screw sleeve 43 penetrates the screw sleeve 43 along its length direction inside. After the screw cap 41 and the screw shaft 42 are inserted into the screw sleeve 43 and follow the threaded connection between the screw shaft 42 and the screw sleeve 43, the lower end of the screw shaft 42 passes through the lower end of the screw sleeve 43 and moves towards the direction close to the resistance wheel 80. The movable end of the brake seat 20 is arranged on the moving path of the screw shaft 42, so that the screw shaft 42 can be in movable contact with the brake seat 20, causing the movable end of the brake seat 20 to swing around its hinge point on the frame 60 towards the outer peripheral surface of the resistance wheel 80. Finally, the felt pad on the lower end surface of the brake seat 20 presses against the wheel surface of the resistance wheel 80 to generate resistance. According to the stroke of the screw shaft 42 relative to the screw sleeve 43, different pressures on the brake seat 20 are changed, thereby generating different frictional resistance effects on the resistance wheel 80.

[0047] The elastic assembly 50 is used to convert the direct contact between the screw shaft 42 and the top surface of the brake seat 20 into elastic contact.

[0048] Preferably, as Figure 3 、 4As shown in FIGS. 5 and 6, the brake seat 20 includes an arc-shaped base 21 and a contact portion 22 integrally provided at the upper end of the middle part of the base 21. On one side of the contact portion 22 and on the upper end surface of the base 21, there is a connecting piece 23. A hinge hole 24 parallel to the axial direction of the resistance wheel 80 is penetrated through the connecting piece 23. Specifically, the connecting piece 23 includes a pair of side walls 231 parallelly distributed on the upper end surface of the base 21 and a connecting wall 232 connecting the same sides of the two side walls 231. The other sides of the two side walls 231 away from the connecting wall 232 are integrally connected to the side wall of the contact portion 22. The hinge hole 24 is penetrated through the two side walls 231, and several reinforcing ribs 233 are provided between the two side walls 231. In this embodiment, the base 21 is hinged to the bottom of the vehicle frame 60 above the resistance wheel 80 through a "C"-shaped connecting piece 25. Specifically, the connecting piece 25 includes left and right side plates 251 and a top plate 252 integrally connecting the tops of the two side plates 251. The top plate 252 is recessed into a recessed shape adapted to the shape of the bottom of the vehicle frame 60 for easy attachment to the bottom of the vehicle frame 60. The two side plates 251 on both sides are respectively lapped on the hinge holes 24 of the two side walls 231 and provided with mounting holes 253 opposite to the positions of the hinge holes 24. By inserting a hinge shaft into the mounting holes 253 and the hinge holes 24, the hinge between the brake seat 20 and the vehicle frame 60 can be realized.

[0049] Thus, through the arc-shaped base 21, it is convenient to install and fix the felt pad at its bottom to form a shape adapted to the wheel surface of the resistance wheel 80, facilitating the adaptive contact between the felt pad and the wheel surface of the resistance wheel 80 to generate uniform friction. In addition, by providing the connecting piece 23, a stable connection point can be formed on one side of the brake seat 20, enabling the brake seat 20 to swing in a circular trajectory around its hinge point towards a direction close to or away from the resistance wheel 80, and cooperating with the rotation of the screw shaft 42 to achieve different pressing effects.

[0050] Preferably, as Figure 5 、 6 shown, the contact portion 22 is recessed inward on the side away from the base 21 to form a mounting groove 221. Hollow grooves 222 are symmetrically formed on both sides of the mounting groove 221 along the extending direction of the arc surface of the base 21. The hollow grooves 222 integrally extend upward along their bottoms to form clamping portions 223. The top of the clamping portion 223 extends to the top surface of the contact portion 22 and protrudes a claw portion 224 towards the inside of the mounting groove 221. The elastic component 50 includes a contact plate 51 and a contact spring 52. The size and shape of the contact plate 51 are adapted to the cross-section of the mounting groove 221. After the contact plate 51 is inserted into the mounting groove 221, it is elastically in contact with the bottom surface of the mounting groove 221 through the contact spring 52. The contact spring 52 pushes the contact plate 51 upward to limit it between the claw portion 224 and the top end of the contact spring 52.

[0051] First, place the contact spring 52 at the inner bottom of the installation groove 221, and then press the contact plate 51 into the installation groove 221. During the process of pressing the contact plate 51, the two claw parts 224 at the top of the clamping part 223 are squeezed and deformed, swinging in the direction away from the installation groove 221. As the contact plate 51 is pressed in, the two claw parts 224 then snap onto both sides of the top surface of the contact plate 51. With the support of the contact spring 52, the contact plate 51 is elastically limited at the top position of the installation groove 221. When it is necessary to adjust the resistance of the fitness bike, by rotating the screw cap 41, the screw shaft 42 moves towards the direction close to the contact plate 51. When it presses against the contact plate 51, an elastic pressing force is provided to the brake seat 20 through the contact plate 51 and the contact spring 52, causing the brake seat 20 to swing towards the wheel surface of the resistance wheel 80 around its hinge point under the action of the elastic pressing force. Finally, the felt pad presses against the surface of the resistance wheel 80 to generate resistance. As the screw cap 41 continues to rotate, the screw shaft 42 continues to press down the contact plate 51, making it sink deeper into the installation groove 221. At this time, since the felt pad has contacted the wheel surface of the resistance wheel 80, the contact spring 52 generates a greater deformation amount, and finally the felt pad generates a greater pressing force on the resistance wheel 80. When the screw cap 41 rotates in the reverse direction and the screw shaft 42 disengages from the top surface of the contact plate 51, the brake seat 20 loses the external pressure, causing the felt pad to slightly contact the wheel surface of the resistance wheel 80 in a lapped manner, and almost no resistance is generated at this time. Thus, through the above process, the resistance adjustment of the fitness bike can be easily achieved.

[0052] Preferably, as Figure 5 、 7 、8 shown, a limiting groove 511 is formed by concave down on the top surface of the contact plate 51 and is distributed along its length direction. The limiting groove 511 is opposite to the position of the screw shaft 42 and the width of the limiting groove 511 is adapted to the diameter of the screw shaft 42. The limiting groove 511 is linear and is distributed along a direction generally parallel to the arc extension direction of the brake seat 20. When the brake seat 20 is at the highest position, the bottom of the screw shaft 42 is located on the side of the limiting groove 511 close to the hinge point of the brake seat 20. As the screw shaft 42 moves along the pressing direction, the brake seat 20 swings towards the resistance wheel 80 around its hinge point along an arc trajectory. At this time, the bottom of the screw shaft 42 relatively moves to the side of the limiting groove 511 away from the hinge point of the brake seat 20. Through the limiting effect of the limiting groove 511, during the up and down swing of the brake seat 20, the bottom of the screw shaft 42 is always limited within the limiting groove 511, ensuring that the force application direction of the screw shaft 42 on the contact plate 51 remains consistent, thereby ensuring that the brake seat 20 can apply an even pressure to the resistance wheel 80.

[0053] Preferably, as Figure 6 、 7As shown in Fig. 8, a top positioning portion 512 adapted to the shape of the limit groove 511 is formed by the bottom of the contact plate 51 protruding as the limit groove 511 is concave. A limit structure 225 is provided at the center of the bottom surface of the installation groove 221. The upper and lower ends of the contact spring 52 are respectively sleeved on the outer peripheral side of the top positioning portion 512 and the outer peripheral side of the limit structure 225. The limit structure 225 is a convex cylindrical protrusion or a concave cylindrical positioning groove. In this embodiment, the limit structure 225 is a concave cylindrical positioning groove. The contact spring 52 is a conical spring. The upper and lower ends of the conical spring respectively have a first contact end with a larger opening and a second contact end with a smaller opening. The first contact end is sleeved on the top positioning portion 512 for limit, and the second contact end is inserted into the groove of the limit structure 225 for limit fixation.

[0054] Due to the structural characteristics of the conical spring, that is, the design of larger at the top and smaller at the bottom, it can cooperate with the top positioning portion 512 protruding from the bottom of the contact plate 51 and the limit structure 225 on the bottom surface of the installation groove 221 to achieve position limitation. The larger first contact end of the conical spring has a larger bearing area, which can evenly bear the pressure transmitted by the contact plate 51, and through its own deformation, transmit the pressure to the bottom of the installation groove 221, and then evenly transmit it to the entire brake seat 20, thus achieving a more uniform elastic pressing effect.

[0055] Embodiment Two

[0056] Please refer to Figure 1 , which is a fitness bike with a resistance adjustment mechanism as the second embodiment of the present invention, including a frame 60, a resistance wheel 80, and a pedal assembly 70 for driving the resistance wheel 80. The resistance of the resistance wheel 80 is adjusted by a resistance mechanism provided on the frame. In this embodiment, the resistance mechanism is the resistance mechanism in Embodiment One.

[0057] Specifically, in this embodiment, the pedal assembly 70 includes pedal parts 71 on both sides of the frame 60 and a transmission mechanism 72 connecting the pedal parts 71 and the resistance wheel 80. The transmission mechanism 72 realizes the transmission between the pedal parts 71 and the resistance wheel 80, such as being connected by a chain structure. Thus, by the user's cyclic pedaling of the pedal parts 71, the resistance wheel 80 is driven to rotate, and different resistance effects are achieved through the connection tightness between the resistance wheel 80 and the resistance mechanism, achieving the purpose of exercise.

[0058] In addition, in this embodiment, a pair of crank tubes 90 are further provided at the front end of the frame 60. The crank tubes 90 are linked with the pedal parts 71 through a link assembly 91 and the hinge relationship with the frame 60. By cyclic pedaling of the pedal parts 71, linkage between the crank tubes 90 and the pedal parts 71 is achieved. The crank tubes 90 swing alternately following the cyclic movement of the pedal parts 71, so that the user can obtain the exercise effect of using both hands and feet.

[0059] The beneficial effects of the utility model are as follows:

[0060] First, the utility model ensures that the pressure between the contact medium 30 and the surface of the resistance wheel 80 is more uniform through the elastic component 50, thereby avoiding the problem of local excessive wear. And because the pressure distribution is more uniform, the wear of the contact medium 30 and the resistance wheel 80 will be more uniform, thereby extending their service life.

[0061] Secondly, by adjusting the screw cap 41 and the screw shaft 42 in the component 40, the user can easily adjust the resistance as needed, which is easy to operate.

[0062] In addition, the brake seat 20 includes an arc-shaped base 21 and a connecting piece 23, which enhance the stability and strength of the entire structure. Meanwhile, the reinforcing ribs 233 on the connecting piece 23 further enhance the reliability of the structure.

[0063] In addition, the mounting groove 221 provides sufficient compression deformation space for the contact plate 51 and the contact spring 52. Under different force adjustments, the pressure transmitted to the bottom of the mounting groove 221 by the contact spring 52 is also different, so that the pressure of the adjustment component 40 can be fully transmitted to the brake seat 20.

[0064] In addition, by using a conical spring as the contact spring 52, different levels of resistance adjustment can be achieved according to different compression states of the spring, thereby improving the accuracy of resistance control.

[0065] In particular, the resistance adjustment mechanism can be applied to various types of fitness bikes, thereby increasing the versatility and market competitiveness of the product.

[0066] In summary, the resistance adjustment mechanism proposed in the present invention overcomes the problems of uniform force application and balanced wear in resistance adjustment in traditional fitness bikes, and provides a better user experience and equipment durability.

[0067] The utility model is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the utility model is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the utility model, or the concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A resistance adjustment mechanism, characterized in that: include: A brake assembly (10) comprises a brake seat (20) and a contact medium (30) arranged on the bottom surface of the brake seat (20), wherein one end of the brake seat (20) is hinged to a vehicle frame (60) on one side of a resistance wheel (80) and the other end is a movable end; The adjusting assembly (40) comprises a screw cap (41), a screw shaft (42) with external threads and a screw sleeve (43) with internal threads, wherein the screw sleeve (43) is fixed to the frame (60) so that the screw shaft (42) can flexibly contact the top surface of the brake seat (20) as the screw shaft rotates. The elastic component (50) is used to convert the direct contact between the spiral shaft (42) and the top surface of the brake seat (20) into elastic contact.

2. A resistance adjustment mechanism according to claim 1, characterized in that: The brake seat (20) comprises an arc-shaped base (21) and a contact portion (22) integrally arranged at the upper end of the middle portion of the base (21); a connecting piece (23) is provided on one side of the contact portion (22) and located on the upper end surface of the base (21); and a hinge hole (24) is penetrated through the connecting piece (23) and is parallel to the axis of the resistance wheel (80).

3. A resistance adjustment mechanism according to claim 2, characterized in that: The connecting piece (23) comprises a pair of side walls (231) parallel to the upper end surface of the base (21) and a connecting wall (232) connecting the two side walls (231) on the same side, the other side of the two side walls (231) away from the connecting wall (232) is integrally connected to the side wall of the contact portion (22), the hinge hole (24) is opened through the two side walls (231), and a plurality of reinforcing ribs (233) are provided between the two side walls (231).

4. A resistance adjustment mechanism according to claim 2, characterized in that: The contact portion (22) is recessed inwardly along a side away from the base (21) to form a mounting groove (221); the mounting groove (221) is symmetrically formed with hollow grooves (222) on both sides along the extension direction of the arc-shaped surface of the base (21); the hollow groove (222) extends upwardly along its bottom to form a clamping portion (223); the top of the clamping portion (223) extends to the top surface of the contact portion (22) and is provided with a claw portion (224) protruding toward the inner side of the mounting groove (221).

5. A resistance adjustment mechanism according to claim 4, characterized in that: The elastic component (50) comprises a contact plate (51) and a contact spring (52); the size and shape of the contact plate (51) are adapted to the cross section of the mounting groove (221); and after the contact plate (51) is inserted into the mounting groove (221), it elastically contacts the bottom surface of the mounting groove (221) through the contact spring (52); the contact spring (52) pushes the contact plate (51) upward to limit the contact plate (51) between the claw portion (224) and the top end of the contact spring (52).

6. A resistance adjustment mechanism according to claim 5, characterized in that: The top surface of the contact plate (51) is concave to form a limiting groove (511) distributed along its length direction; the limiting groove (511) is opposite to the screw shaft (42) and the width of the limiting groove (511) is adapted to the diameter of the screw shaft (42).

7. A resistance adjustment mechanism according to claim 6, characterized in that: The bottom of the contact plate (51) is concave as the limiting groove (511) is protruded to form an upper positioning portion (512) that is adapted to the shape of the limiting groove (511); a limiting structure (225) is provided at the center of the bottom surface of the mounting groove (221); and the upper and lower ends of the contact spring (52) are respectively limitedly sleeved on the outer peripheral side of the upper positioning portion (512) and the outer peripheral side of the limiting structure (225).

8. A resistance adjustment mechanism according to claim 7, characterized in that: The limiting structure (225) is an upward convex cylindrical protrusion or a downward concave cylindrical positioning groove.

9. A resistance adjustment mechanism according to claim 7, characterized in that: The contact spring (52) is a conical spring, and the upper and lower ends of the conical spring respectively have a first contact end with a larger opening and a second contact end with a smaller opening, the first contact end is limitedly sleeved with the upper positioning portion (512), and the second contact end is limitedly connected with the limiting structure (225).

10. An exercise bike having a resistance adjustment mechanism as claimed in claim 1, characterized in that: The invention comprises a frame (60), a resistance wheel (80) and a pedal assembly (70) for driving the resistance wheel (80); the resistance wheel (80) is adjusted by a resistance adjustment mechanism as claimed in claim 1 and arranged on the frame.

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