Connecting structure of crank and pedal of fitness equipment

Abstract

The utility model discloses a connecting structure of a crank and a pedal of fitness equipment. The connecting structure comprises the crank and the pedal, the pedal comprises a pedal frame and a rotating shaft, and the pedal frame is rotatably connected with the rotating shaft; one end of the rotating shaft is provided with an external thread, and the crank is provided with an internal thread; the external thread of the rotating shaft is screwed and fixed with the internal thread of the crank; a one-way transmission mechanism is further installed between the rotating shaft and the crank, and the rotating shaft and the crank are limited to rotate in the thread loosening direction through the one-way transmission mechanism. According to the structure, thread matching structures of the left pedal, the right pedal, the left crank and the right crank can be designed into right-hand thread matching, so that the manufacturing process is simplified; the phenomenon that when a user installs the pedal, threads are damaged due to installation errors of the positive and negative thread structures can be avoided; particularly, the one-way transmission mechanism is adopted, so that a matched thread structure can be prevented from rotating towards a loose direction, and the connection between the pedal and the crank is more stable.

Description

Technical Field

[0001] The utility model relates to a fitness apparatus, in particular to a connecting structure between a crank and a pedal of a fitness apparatus. Background Art

[0002] There are various existing fitness apparatuses, including exercise bikes, elliptical machines, etc. They mainly promote cardiovascular movement, accelerate metabolism, enhance heart and lung functions, and thus improve the physical fitness of the human body through long-term and moderately intense exercise of the body. Usually, a crank and a pedal are provided on these fitness apparatuses. A rotating shaft is rotatably connected to the pedal, and a through hole for fixing the rotating shaft is provided on the crank, and the pedal is installed on the crank. The prior art is that an internal thread is provided on the crank, and an external thread is provided on the rotating shaft of the pedal. When the crank and the pedal are connected, they are fixed by threaded locking. Since there are two left and right cranks and pedals respectively, and they are respectively matched, in order to prevent the matched threads from loosening during use, the prior art designs the matched threads on the left and right sides into right-hand threads and left-hand threads respectively. This structure mainly has the following disadvantages:

[0003] First, it is necessary to separately manufacture the threaded matching structures of the left and right pedals and the left and right cranks into right-hand threads and left-hand threads respectively, which results in complicated manufacturing processes.

[0004] Second, the crank and the pedal are usually packaged and transported in a disassembled manner. When the user uses it, the pedal needs to be installed on the crank. Some users will install the threaded matching of the left and right pedals and the left and right cranks in the right-hand thread manner during the installation process. In this way, the threads of the pedal and the crank with a left-hand thread structure will be damaged. Summary of the Utility Model

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a connecting structure between a crank and a pedal of a fitness apparatus. By setting a one-way transmission mechanism, on the one hand, the threaded matching structures of the left and right pedals and the left and right cranks can be designed as right-hand thread matches, which simplifies the manufacturing process; on the other hand, it can avoid the damage of the threads caused by the incorrect installation of the left-hand and right-hand thread structures when the user installs the pedal; in particular, the one-way transmission mechanism can prevent the matched threaded structure from rotating in the loosening direction, making the connection between the pedal and the crank more stable.

[0006] The technical solution adopted by the present utility model to solve its technical problems is: a connecting structure between the crank and the pedal of a fitness apparatus, including a crank and a pedal; the pedal includes a pedal frame and a rotating shaft, and the pedal frame is rotatably connected to the rotating shaft; one end of the rotating shaft is provided with an external thread, and the crank is provided with an internal thread; the external thread of the rotating shaft is screwed and fixed with the internal thread of the crank in a positive thread structure; a one-way transmission mechanism is further installed between the rotating shaft and the crank to use the one-way transmission mechanism to limit the rotation between the rotating shaft and the crank in the direction of thread relaxation.

[0007] The one-way transmission mechanism includes a one-way bearing, a bearing fixing plate and a screw; the crank is provided with a first through hole, and the internal thread is provided in the first through hole; the bearing fixing plate is provided with a second through hole; the bearing fixing plate is fixed to the crank by a screw and makes the second through hole of the bearing fixing plate opposite to the first through hole of the crank; the one-way bearing is installed between the second through hole of the bearing fixing plate and the rotating shaft.

[0008] The one-way transmission mechanism is installed on the outer side of the crank far from the pedal; one end of the rotating shaft is provided with a step so that one end of the rotating shaft forms two sections with variable diameters; the external thread is provided at the large-diameter section of one end of the rotating shaft, and the one-way bearing is installed at the small-diameter section of one end of the rotating shaft.

[0009] A part of the one-way bearing is offset to a part of the first through hole of the crank; the other part of the first through hole of the crank is provided with the internal thread.

[0010] The one-way transmission mechanism is installed on the inner side of the crank close to the pedal; the first through hole of the crank is provided with a step so that two sections with variable diameters are formed in the first through hole; the internal thread is provided at the small-diameter section of the first through hole, and a part of the one-way bearing is offset to the position of the large-diameter section of the first through hole of the crank.

[0011] The one-way transmission mechanism includes a ratchet, a ratchet paddle, a compression spring, a fixing pin, a cover plate and a screw; the crank is provided with a third through hole, and the internal thread is provided in the third through hole; the ratchet is installed between the third through hole of the crank and the rotating shaft; the cover plate is fixed to the crank by a screw and snaps the ratchet into the third through hole; the ratchet paddle is installed in the crank through the compression spring and the fixing pin and cooperates with the ratchet.

[0012] The one-way transmission mechanism is installed on the outer side of the crank far from the pedal; one end of the rotating shaft is provided with a step so that one end of the rotating shaft forms two sections with variable diameters; the external thread is provided at the large-diameter section of one end of the rotating shaft, and the ratchet is installed at the small-diameter section of one end of the rotating shaft.

[0013] The one-way drive mechanism is installed on the inner side of the crank near the pedal; one end of the rotating shaft is provided with a groove, and the ratchet wheel is installed at the groove at one end of the rotating shaft; the external thread is provided outside the groove at one end of the rotating shaft.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] In the present utility model, a one-way drive mechanism is further installed between the rotating shaft and the crank to use the one-way drive mechanism to restrict the rotation between the rotating shaft and the crank in the direction of thread relaxation. With this structure of the present utility model, on the one hand, the thread fit structures of the left and right pedals and the left and right cranks can be designed as right-hand thread fits, simplifying the manufacturing process; on the other hand, it can prevent the screw teeth from being damaged due to incorrect installation of the right- and left-hand thread structures when the user installs the pedal; in particular, the one-way drive mechanism can prevent the mating thread structure from rotating in the direction of relaxation, making the connection between the pedal and the crank more stable.

[0016] The following further describes the present utility model in detail with reference to the accompanying drawings and embodiments; however, the connection structure between the crank and the pedal of a fitness apparatus of the present utility model is not limited to the embodiments. Description of the Drawings

[0017] Figure 1 is an exploded schematic view of Embodiment 1 of the present utility model;

[0018] Figure 2 is a three-dimensional structural schematic view of Embodiment 1 of the present utility model;

[0019] Figure 3 is a side view of Embodiment 1 of the present utility model;

[0020] Figure 4 is Figure 3 a cross-sectional view along line A-A in

[0021] Figure 5 is Figure 4 an enlarged schematic view at B of

[0022] Figure 6 is an exploded schematic view of Embodiment 2 of the present utility model;

[0023] Figure 7 is a three-dimensional structural schematic view of Embodiment 2 of the present utility model;

[0024] Figure 8 is a side view of Embodiment 2 of the present utility model;

[0025] Figure 9 is Figure 8 a cross-sectional view along line C-C in

[0026] Figure 10 is Figure 9 The enlarged view of part D of

[0027] Figure 11 is the exploded view of the third embodiment of the present utility model;

[0028] Figure 12 is Figure 11 The enlarged view of part E of

[0029] Figure 13 is the three-dimensional structure view of the third embodiment of the present utility model;

[0030] Figure 14 is the side view of the third embodiment of the present utility model;

[0031] Figure 15 is Figure 14 The cross-sectional view along line F-F in

[0032] Figure 16 is Figure 15 The enlarged view of part H of

[0033] Figure 17 is Figure 14 The perspective view of part G of

[0034] Figure 18 is the exploded view of the fourth embodiment of the present utility model;

[0035] Figure 19 is Figure 18 The enlarged view of part I of

[0036] Figure 20 is the three-dimensional structure view of the fourth embodiment of the present utility model;

[0037] Figure 21 is the side view of the fourth embodiment of the present utility model;

[0038] Figure 22 is Figure 21 The cross-sectional view along line J-J in

[0039] Figure 23 is Figure 22 The enlarged view of part L of

[0040] Figure 24 is Figure 21 The perspective view of part K of Detailed implementation manners

[0041] Embodiment 1

[0042] See Figures 1 to 5As shown in the figure, a connecting structure between a crank and a pedal of a fitness apparatus of the present utility model includes a crank 1 and a pedal 2; the pedal 2 includes a pedal frame 21 and a rotating shaft 22, and the pedal frame 21 is rotatably connected to the rotating shaft 22; one end of the rotating shaft 22 is provided with an external thread, and the crank 1 is provided with an internal thread; the external thread of the rotating shaft 22 and the internal thread of the crank 1 are screwed and fixed in a positive thread structure; a one-way transmission mechanism 3 is further installed between the rotating shaft 22 and the crank 1 to limit the rotation between the rotating shaft 22 and the crank 1 in the direction of thread relaxation by using the one-way transmission mechanism 3.

[0043] In this embodiment, the one-way transmission mechanism 3 includes a one-way bearing 31, a bearing fixing plate 32 and a screw 33; the crank 1 is provided with a first through hole 11, and the internal thread is provided in the first through hole 11; the bearing fixing plate 32 is provided with a second through hole 321; the bearing fixing plate 321 is fixed to the crank 1 by a screw 33 and the second through hole 321 of the bearing fixing plate 32 is made to be opposite to the first through hole 11 of the crank 1; the one-way bearing 31 is installed between the second through hole 321 of the bearing fixing plate 32 and the rotating shaft 22.

[0044] In this embodiment, the one-way transmission mechanism 3 is installed on the outer side of the crank 1 away from the pedal; one end of the rotating shaft 22 is provided with a step so that one end of the rotating shaft 22 forms two sections with variable diameters; the external thread is provided at the large diameter section 221 of one end of the rotating shaft 22, and the one-way bearing 31 is installed at the small diameter section 222 of one end of the rotating shaft 22.

[0045] In this embodiment, a part of the one-way bearing 31 is offset to a part of the first through hole 11 of the crank 1; the internal thread is provided at another part of the first through hole 11 of the crank 1.

[0046] For the connecting structure between the crank and the pedal of a fitness apparatus of the present utility model, by installing the one-way transmission mechanism 3 between the rotating shaft 21 and the crank 1, on the one hand, the thread matching structures of the left and right pedals and the left and right cranks can be designed as positive thread matches, simplifying the manufacturing process; on the other hand, it can avoid the damage of the thread teeth caused by the incorrect installation of the positive and negative thread structures when the user installs the pedal; in particular, the one-way transmission mechanism can prevent the mating thread structure from rotating in the direction of relaxation, making the connection between the pedal and the crank more stable.

[0047] Embodiment 2

[0048] See Figures 6 to 10As shown, the connection structure between the crank and the pedal of a fitness device of the present utility model is different from that of the first embodiment in that the one-way transmission mechanism 3 is installed on the inner side of the crank 1 close to the pedal; a step is provided in the first through hole 11 of the crank 1 so that two sections with variable diameters are formed in the first through hole 11; the internal thread is provided at the small-diameter section 111 of the first through hole 11, and a part of the one-way bearing 31 is offset to the position of the large-diameter section 112 of the first through hole 11 of the crank 1.

[0049] Embodiment Three

[0050] See Figures 11 to 17 As shown, the connection structure between the crank and the pedal of a fitness device of the present utility model is different from that of the first embodiment in that the one-way transmission mechanism 3 includes a ratchet 34, a ratchet paddle 35, a compression spring 36, a fixing pin 37, a cover plate 38 and a screw 39; the crank 1 is provided with a third through hole 12, and the internal thread is provided in the third through hole 12; the ratchet 34 is installed between the third through hole 12 of the crank 1 and the rotating shaft 22; the cover plate 38 is fixed to the crank 1 by a screw 39 and the ratchet 34 is clamped into the third through hole 12; the ratchet paddle 35 is installed in the crank 1 through a compression spring 36 and a fixing pin 37 and cooperates with the ratchet 34.

[0051] In this embodiment, the one-way transmission mechanism 3 is installed on the outer side of the crank 1 away from the pedal; a step is provided at one end of the rotating shaft 22 so that two sections with variable diameters are formed at one end of the rotating shaft 22; the external thread is provided at the large-diameter section 221 at one end of the rotating shaft 22, and the ratchet 34 is installed at the small-diameter section 222 at one end of the rotating shaft 22.

[0052] Embodiment Four

[0053] See Figures 18 to 24 As shown, the connection structure between the crank and the pedal of a fitness device of the present utility model is different from that of the third embodiment in that the one-way transmission mechanism 3 is installed on the inner side of the crank 1 close to the pedal; a groove 223 is provided at one end of the rotating shaft 22, and the ratchet 34 is installed at the groove 223 at one end of the rotating shaft 22; the external thread is provided outside the groove 223 at one end of the rotating shaft 22.

[0054] The above is only a preferred embodiment of the present utility model and does not impose any form of limitation on the present utility model. Although the present utility model has been disclosed above in its preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can, without departing from the scope of the technical solution of the present utility model, make many possible changes and modifications to the technical solution of the present utility model by using the technical content disclosed above, or modify it into an equivalent equivalent embodiment. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present utility model without departing from the content of the technical solution of the present utility model shall fall within the scope of protection of the technical solution of the present utility model.

Claims

1. A connecting structure between a crank and a pedal of a fitness equipment, comprising a crank and a pedal; the pedal comprises a pedal frame and a rotating shaft, the pedal frame and the rotating shaft are rotatably connected; one end of the rotating shaft is provided with an external thread, and the crank is provided with an internal thread; the characteristics are: The external thread of the rotating shaft and the internal thread of the crank are screwed and fixed in a orthogonal thread structure; a one-way transmission mechanism is also installed between the rotating shaft and the crank to limit the rotation of the rotating shaft and the crank in the direction of thread loosening.

2. The connecting structure of the crank and pedal of the fitness equipment according to claim 1, characterized in that: The one-way transmission mechanism includes a one-way bearing, a bearing fixing plate and a screw; the crank is provided with a first through hole, and the first through hole is provided with the internal thread; the bearing fixing plate is provided with a second through hole; the bearing fixing plate is fixed to the crank by screws and the second through hole of the bearing fixing plate is opposite to the first through hole of the crank; the one-way bearing is installed between the second through hole of the bearing fixing plate and the rotating shaft.

3. The connecting structure of the crank and pedal of the fitness equipment according to claim 2, characterized in that: The one-way transmission mechanism is installed on the outer side of the crank away from the pedal; a step is provided at one end of the rotating shaft so that one end of the rotating shaft forms two sections with different diameters; the external thread is provided at the large diameter section at one end of the rotating shaft, and the one-way bearing is installed at the small diameter section at one end of the rotating shaft.

4. The connecting structure of the crank and pedal of the fitness equipment according to claim 3, characterized in that: A portion of the one-way bearing is offset to a portion of the first through hole of the crank; and the internal thread is arranged at another portion of the first through hole of the crank.

5. The connecting structure of the crank and pedal of the fitness equipment according to claim 2, characterized in that: The one-way transmission mechanism is installed on the inner side of the crank close to the pedal; the first through hole of the crank is provided with a step so that two sections of varying diameters are formed in the first through hole; the internal thread is provided at the small diameter section of the first through hole, and a part of the one-way bearing is offset to the large diameter section of the first through hole of the crank.

6. The connecting structure of the crank and pedal of the fitness equipment according to claim 1, characterized in that: The one-way transmission mechanism includes a ratchet, a ratchet paddle, a compression spring, a fixing pin, a cover plate and a screw; the crank is provided with a third through hole, and the third through hole is provided with the internal thread; the ratchet is installed between the third through hole of the crank and the rotating shaft; the cover plate is fixed to the crank by screws and the ratchet is clamped into the third through hole; the ratchet paddle is installed in the crank by a compression spring and a fixing pin and cooperates with the ratchet.

7. The connecting structure of the crank and pedal of the fitness equipment according to claim 6, characterized in that: The one-way transmission mechanism is installed on the outer side of the crank away from the pedal; a step is provided at one end of the rotating shaft so that one end of the rotating shaft forms two sections with different diameters; the external thread is provided at the large diameter section at one end of the rotating shaft, and the ratchet is installed at the small diameter section at one end of the rotating shaft.

8. The connecting structure of the crank and pedal of the fitness equipment according to claim 6, characterized in that: The one-way transmission mechanism is installed on the inner side of the crank close to the pedal; a groove is provided at one end of the rotating shaft, and the ratchet is installed in the groove at one end of the rotating shaft; the external thread is arranged outside the groove at one end of the rotating shaft.

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