Elliptical machine

Abstract

The utility model discloses an elliptical machine which comprises a vehicle frame, transmission systems formed by connecting first cranks, second cranks and pedal assemblies in series are arranged on the two sides of the vehicle frame, and the ends, away from the second cranks, of the first cranks on the two sides of the vehicle frame are fixedly connected and rotationally connected to the vehicle frame. A transmission assembly is further arranged between the rotating shaft of the first crank and the rotating shaft of the second crank and can enable the rotating speed of the first crank and the rotating speed of the second crank to be in a preset proportion, the length of the second crank is smaller than the rotating radius of the first crank, and therefore the movement track of the pedal assembly is similar to or equal to an oval when the pedal assembly is treaded. The elliptical machine is compact in overall structure, the overall size of the elliptical machine is reduced, and the elliptical machine is convenient to store.

Description

Technical Field

[0001] This utility model relates to the field of fitness equipment, and in particular to an elliptical machine. Background Technology

[0002] Elliptical trainers, also known as space walkers, are a popular choice among users and professionals as they are highly effective for cardiovascular exercise.

[0003] The existing elliptical trainer structure consists of components such as the lower swing arm, upper swing arm, foot pedals, and turntable on both sides of the elliptical trainer. The upper and lower swing arms are connected and can be rotated through a rotating shaft. The end of the lower swing arm is connected to the foot pedals through a rotating shaft and can rotate. When the user uses both hands and feet to step on the foot pedals and pull the upper swing arm back and forth, the trajectory of the center point of the foot pedal is an ellipse. Because this type of elliptical trainer requires the lower and upper swing arms to connect the user's feet and hands, both the lower and upper swing arms need to be relatively long, and the swing range is relatively large. This results in the existing elliptical trainer being large in size and not easy to store. Utility Model Content

[0004] The purpose of this invention is to provide an elliptical trainer that solves the problem of large size and inconvenience in storage of existing elliptical trainers. The specific technical solution is as follows:

[0005] This utility model provides an elliptical trainer, including a frame. Both sides of the frame are provided with a transmission system consisting of a first crank, a second crank, and a pedal assembly connected in series. The first cranks on both sides of the frame are fixedly connected to each other and rotatably connected to the frame at the ends away from the second cranks. A transmission assembly is also provided between the shafts of the first and second cranks. The transmission assembly can make the rotation speeds of the first and second cranks in a preset ratio, and the length of the second crank is less than the rotation radius of the first crank, so that when the pedal assembly is pressed, the movement trajectory of the pedal assembly is similar to or equal to an ellipse.

[0006] Furthermore, a turntable support is provided on one or both sides of the frame. The turntable support includes multiple supports radiating outward from the central axis, one of which forms the first crank. A turntable is fixedly connected to the turntable support to improve the stability of the turntable.

[0007] Furthermore, a turntable is provided on one side of the frame, and a central shaft is provided at the center of the turntable bracket. The central shaft is rotatably connected to the frame and passes through the frame to be fixedly connected to the first crank on the other side of the frame.

[0008] Furthermore, the turntable support has a cross structure, and the length of each side of the cross structure is less than the radius of the turntable.

[0009] Furthermore, a turntable is provided on one or both sides of the frame, and the second crank is rotatably connected to the turntable, so that the line connecting the center of the turntable and the shaft of the second crank forms the first crank.

[0010] Furthermore, a flywheel is also installed on the frame, which is connected to the turntable by a belt to increase the resistance when the turntable rotates.

[0011] Furthermore, the transmission assembly includes a first sprocket, a second sprocket, and a chain connecting the first sprocket and the second sprocket. The first sprocket is fixed to the frame and can rotate around the axis of the first crank, and the second sprocket is fixedly connected to the axis of rotation of the second crank.

[0012] Furthermore, the gear ratio of the first sprocket and the second sprocket is 2:1, so that the movement trajectory of the pedal assembly is elliptical.

[0013] Furthermore, a clamping seat is provided on the first crank, and a clamping device is provided on the clamping seat. The clamping device can adjust the relative distance between the chain and the first crank to adjust the chain tension.

[0014] Furthermore, the clamping device includes a tension wheel assembly and a clamping assembly. A hollow track for the tension wheel assembly to move is provided in the middle of the clamping seat, and an adjustment through hole is provided at the top. The tension wheel assembly is slidably connected to the hollow track of the clamping seat, so that the tension wheel of the tension wheel assembly abuts against the chain. The clamping assembly is connected to the adjustment through hole and abuts against the tension wheel assembly. The clamping assembly can reciprocate within the adjustment through hole, thereby adjusting the position of the tension wheel assembly on the hollow track by adjusting the position of the clamping assembly within the adjustment through hole, thus achieving chain tension adjustment.

[0015] The elliptical trainer of this invention consists of a first crank and a second crank forming a series double-link mechanism. The second crank rotates at one end of the first crank, while the other end of the first crank rotates relative to the frame. A transmission system is used to make the rotational speed of the first crank and the rotational speed of the second crank a preset ratio, so that the movement trajectory of the pedal assembly at the end of the second crank presents an elliptical trajectory. The elliptical trajectory of this invention is only set at one end of the pedal, which greatly shortens the length of the first crank and the second crank, thereby reducing the size of the elliptical trainer and making it easier to store. Attached Figure Description

[0016] Figure 1 This is an exploded view of an elliptical machine according to an embodiment of the present invention.

[0017] Figure 2 This is an exploded view of the right-side transmission system according to an embodiment of the present invention.

[0018] Figure 3 This is an exploded view of the left-side transmission system according to an embodiment of the present invention.

[0019] Figure 4 This is a schematic diagram showing the position of the end trajectory of an elliptical machine in one embodiment of the present invention when it is located at the minor axis of an ellipse.

[0020] Figure 5 This is a schematic diagram showing the position of the end trajectory of an elliptical machine in one embodiment of the present invention when it is located at the major axis of an ellipse. Detailed Implementation

[0021] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0022] like Figure 1 , Figure 2 , Figure 3 As shown, the elliptical trainer provided in this embodiment of the present invention includes a frame 4, and a transmission system 1 is provided on both sides of the frame 4. The transmission system includes at least a first crank 11, a second crank 12 and a pedal assembly 13 connected in series. The first cranks 11 on both sides of the frame 4 are fixedly connected to each other at the end away from the second crank 12 and rotatably connected to the frame 4.

[0023] See attached document Figure 4 , Figure 5 In this embodiment of the invention, the overall structure of the frame 4 is similar to a rectangle. The transmission system 1 and the turntable 2 for pedals are installed near the center of one side of the frame 4, placing them close to the rectangular outline. Furthermore, a foldable handlebar assembly 5 is provided on the other side of the frame 4. When folded, the handlebar assembly 5 can be placed near the top edge of the frame 4. At this point, the overall shape of the elliptical trainer is regular, making it very easy to store. It should also be noted that the handlebar assembly 5 provided in this embodiment is designed independently of the transmission system 1, avoiding the problem of excessive size caused by the long distance between the head and tail of the elliptical trainer.

[0024] Furthermore, for the transmission system 1, a bottom bracket 14 is also provided between the first cranks 11 on both sides of the frame 4. Obviously, the bottom bracket 14 is located at the end away from the second crank 12. The bottom bracket 14 is fixedly connected to both first cranks 11, and the two first cranks 11 are at a 180° angle. Correspondingly, the frame 4 is provided with a through hole for mounting the bottom bracket 14. A corresponding through hole bearing assembly is installed in the through hole. The through hole bearing assembly not only allows the bottom bracket 14 to rotate in the through hole, but also limits the position of the bottom bracket 14 on the frame 4.

[0025] For ease of installation, in one specific embodiment of this utility model, the central shaft 14 is fixedly connected to the first crank 11 located on the right side of the frame 4. This fixing method can be either direct welding to the first crank 11 or fixing the two together using a bolt and nut assembly. After the central shaft 14 passes through the through-hole bearing assembly, the first crank 11 located on the left side of the frame 4 is then connected to the central shaft 14. At this time, the end of the central shaft 14 can be a D-shaped shaft. The first crank 11 on the left side is provided with a D-shaped groove locking mechanism with an opening on one side, and a threaded hole is also provided at the opening. The locking bolt 113 is provided in the locking threaded hole, and the locking force between the D-shaped groove locking mechanism and the D-shaped shaft can be adjusted by adjusting the locking bolt 113, allowing the user to adjust the locking force as needed.

[0026] Furthermore, a crankshaft sleeve is fixedly connected to the connecting end of the first crank 11 and the second crank 12, and the second crank 12 is fixedly connected to the crank shaft 16. The crank shaft 16 is connected to the crankshaft sleeve through the bearing 17, so that the second crank 12 can rotate relative to the first crank 11.

[0027] In a preferred embodiment of this utility model, the end of the crankshaft 16 is a tapered square shaft, and the second crank 12 is provided with a square hole that matches the tapered square shaft, so that the second crank 12 is installed after the tapered square shaft and the two remain relatively fixed, avoiding slippage between the second crank 12 and the crankshaft 16, and ensuring the stability and safety of the movement.

[0028] Furthermore, the pedal assembly 13 includes a pedal and a pedal shaft, wherein the pedal shaft is fixedly connected to the second crank 12, and the pedal can rotate freely around the second crank 12. In this embodiment of the invention, the pedal is a wide square pedal, which can improve the foot comfort of the athlete during exercise. The pedal is rotatable, allowing the athlete to adjust the step angle according to their own habits during exercise, further improving the comfort and safety of the athlete during exercise.

[0029] Furthermore, a transmission assembly is provided between the shaft of the first crank 11 and the shaft of the second crank 12. The transmission assembly can make the rotation speed of the first crank 11 and the second crank 12 in a preset ratio, and the length of the second crank 12 is less than the rotation radius of the first crank 11, so that the movement trajectory of the pedal assembly 13 is similar to or equal to an ellipse when the pedal assembly 13 is pressed.

[0030] In a specific embodiment of this utility model, the transmission component is a sprocket and chain transmission device, which specifically includes a first sprocket 32, a second sprocket 15, and a chain 31 connecting the first sprocket 32 ​​and the second sprocket 15. The first sprocket 32 ​​is fixed on the frame 4 and coaxially arranged with the central shaft 14, and the second sprocket 15 is fixedly connected to the rotating shaft of the second crank 12.

[0031] In one specific embodiment of this utility model, the first sprocket 32 ​​is fixedly connected to both sides of the through hole of the frame 4 and is coaxially arranged with the bottom bracket 14. The second sprocket 15 is connected to the crankshaft 16. That is, the second crank 12 is connected to one end of the crankshaft 16, and the second sprocket 15 is connected to the other end of the crankshaft 16, so that the second crank 12 and the second sprocket 15 are located on both sides of the first crank 11.

[0032] Furthermore, in a specific embodiment of this utility model, the gear ratio between the first sprocket 32 ​​and the second sprocket 15 is 2:1, at which point the movement trajectory of the pedal assembly 13 is as follows: Figure 4 , Figure 5 The elliptical structure shown. (Refer to...) Figure 4 and Figure 5 It can be seen that when the left and right pedals are in a horizontal position, the line connecting the pivot points of the pedals is the major axis of the elliptical trajectory (major axis length = first crank length * 2 + second crank length * 2); when the left and right pedals are in a vertical position, the line connecting the pivot points of the pedals is the minor axis of the elliptical trajectory (minor axis length = first crank length * 2 - second crank length * 2). Because the gear ratio of the first sprocket 32 ​​and the second sprocket 15 is 2:1, whenever the second sprocket 15 rotates 180°, the chain 31 rotates 90° on the second sprocket 15, and the pedal connected to the second crank 12 will complete one movement from the end of the major axis to the end of the minor axis. When the left pedal is at the end of the major axis, the right pedal is at the other end of the major axis; when the left pedal is at the end of the minor axis, the right pedal is at the other end of the minor axis. By repeatedly pedaling in this way, the left and right pedals move simultaneously from both ends of the major axis to both ends of the minor axis of the ellipse, forming an elliptical motion trajectory to achieve the exercise effect of the elliptical machine.

[0033] It should be noted that a turntable support 21 is also provided on one or both sides of the turntable 2. The turntable support 21 includes multiple supports radiating outward from the central axis, one of which forms the first crank 11. The turntable 2 is fixedly connected to the turntable support 21, which can improve the stability of the turntable 2 when it rotates.

[0034] Specifically, such as Figure 2 As shown in the specific embodiment of this utility model, a turntable 2 is installed on the right side of the frame 4. At this time, the turntable support 21 is a cross structure as shown in the figure. One side of the cross structure forms the first crank 11, and each side of the cross structure is smaller than the radius of the turntable 2. This makes the periphery of the turntable 2 larger than the movement radius of the first crank 11, making the structure of the elliptical machine more beautiful and compact.

[0035] It should be noted that in this embodiment of the invention, the turntable 2 can be installed on one side of the frame 4, or it can be installed on both sides of the frame 4 as needed. The configuration of the elliptical machine can be selected according to actual needs. Correspondingly, when turntables are installed on both sides, flywheels can also be set on one or both sides to provide resistance for the rotation of the turntables.

[0036] Furthermore, in another embodiment of this utility model, the first crank 11 can be a virtual concept. When a turntable 2 is installed on one or both sides of the frame 4, it can be rotatably connected to the frame 4 by the turntable 2 alone, while the second crank 12 on that side is rotatably connected to the turntable 2. In this case, the first crank 11 is the line connecting the center of the turntable 2 and the axis of rotation of the second crank 12. If turntables 2 are installed on both sides, then this structure is adopted on both sides. At this time, the movement trajectory of the pedal end is still elliptical, and the turntable support 21 is omitted, making the elliptical machine more compact and lighter.

[0037] Furthermore, in this embodiment of the present invention, a pressing seat 18 is also provided on the first crank 11, and a pressing device is provided on the pressing seat 18. The pressing device can adjust the relative distance between the chain 31 and the first crank 11 to adjust the tension of the chain 31.

[0038] Furthermore, the clamping device includes a tension wheel assembly and a clamping assembly. A hollow track for the tension wheel assembly to move is provided in the middle of the clamping seat 18, and an adjustment through hole is provided at the top. The tension wheel assembly is slidably connected to the hollow track of the clamping seat, so that the tension wheel of the tension wheel assembly abuts against the chain 31. The clamping assembly is connected to the adjustment through hole. By adjusting the position of the clamping assembly in the adjustment through hole and its abutment against the tension wheel assembly, the clamping assembly can reciprocate within the adjustment through hole. This adjustment of the clamping assembly's position in the adjustment through hole adjusts the position of the tension wheel assembly on the hollow track, thereby adjusting the chain tension and thus the tension of the chain 31. In this embodiment of the invention, the clamping seat and the clamping device can be located on both sides of the first crank 11, or on one side of the first crank 11.

[0039] Furthermore, the tensioning wheel assembly specifically includes a pressure wheel shaft 111, which passes through the hollow track in the middle of the pressure seat 18 and is fixed by screws. A tensioning wheel 19 is rotatably mounted on the other end of the pressure wheel shaft 111. Specifically, the tensioning wheel 19 is mounted on the pressure wheel shaft 111 on both axial sides via tension wheel bearings 110, allowing the tensioning wheel 19 to rotate around the pressure wheel shaft 111. During use, the tensioning wheel 19 abuts against the chain 31. Correspondingly, the pressure assembly includes a pressure bolt 113 and a pressure block 112. The pressure bolt 113 is connected to an adjustment through hole on the top of the pressure seat 18 and passes through the adjustment through hole to connect to the pressure block 112. The pressure block 112 abuts against the pressure wheel shaft 111. By adjusting the pressure bolt 113, the position of the pressure block in the adjustment through hole can be adjusted, thereby adjusting the vertical position of the tensioning wheel 19.

[0040] Furthermore, in this embodiment of the invention, the transmission component is located on the side closer to the frame 4, while the turntable 2 is located on the side farther from the frame 4. This avoids collisions between the user and the transmission component during exercise, improving safety and the stability of the elliptical machine. The turntable 2's location away from the frame 4 also partially obscures the inner rotating mechanism, enhancing the aesthetics of the elliptical machine. Additionally, since the handrail assembly 5 in this embodiment is foldable, placing the turntable 2 away from the frame 4 allows for folding space to be reserved for the handrail assembly 5.

[0041] The elliptical trainer provided by this utility model consists of a first crank 11 and a second crank 12 forming a series double-link mechanism. One end of the second crank 12 rotates, while the other end of the first crank 11 rotates relative to the frame 4. A transmission system 1 ensures that the rotational speed of the first crank 11 and the second crank 12 are in a preset ratio, resulting in an elliptical trajectory for the pedal assembly 13 at the end of the second crank 12. This elliptical trajectory is only located at one end of the pedal, significantly shortening the length of the first crank 11 and the second crank 12, thus reducing the size of the elliptical trainer and making it easier to store. Furthermore, a turntable 2 is fixedly mounted on the first crank 11, which not only provides resistance during movement but also improves the compactness of the elliptical trainer by rationally positioning the turntable 2, further reducing its size.

[0042] The present invention has been further described above with reference to specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the substance and scope of the present invention. Various modifications made to the above embodiments by those skilled in the art after reading this specification are all within the scope of protection of the present invention. The various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not further describe various possible combinations.

[0043] If the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

Claims

1. An elliptical machine characterized by, The utility model provides a kind of elliptical pedal bicycle, including frame, the transmission system of frame both sides is provided with by first crank, second crank and pedal assembly series connection, the first crank of frame both sides is fixedly connected and rotationally connected to frame at the end away from second crank, transmission assembly is further provided between the rotation axis of first crank and the rotation axis of second crank, transmission assembly can make the rotation speed of first crank and second crank be preset proportion, and the length of second crank is less than the rotation radius of first crank, so that the movement track of pedal assembly is similar or equal to oval when stepping pedal assembly.

2. The elliptical machine of claim 1, wherein, One side or both sides of the frame is further provided with a turntable support, which includes a plurality of supports radiating outward from a central shaft, one of which forms a first crank, and a turntable is fixedly connected to the turntable support to improve the stability of the turntable.

3. The elliptical machine of claim 2, wherein, One side of the frame is provided with a turntable, and a central shaft is arranged in the center of the turntable support, which is rotationally connected to the frame and fixedly connected to the first crank on the other side of the frame.

4. Elliptical trainer according to claim 2 or 3, characterized in that The turntable support is a cross structure, and the length of each side of the cross structure is less than the radius of the turntable.

5. The elliptical machine of claim 1, wherein, One side or both sides of the frame is further provided with a turntable, and the second crank is rotationally connected to the turntable, so that the line connecting the center of the turntable and the rotation axis of the second crank forms a first crank.

6. The elliptical machine of claim 2 or 5, wherein, A freewheel is further arranged on the frame, and the freewheel is connected to the turntable through a belt to increase the resistance when the turntable rotates.

7. The elliptical machine of claim 1, wherein, The transmission assembly includes a first sprocket, a second sprocket, and a chain connecting the first sprocket and the second sprocket, the first sprocket is fixed to the frame and can rotate around the rotation axis of the first crank, and the second sprocket is fixedly connected to the rotation axis of the second crank.

8. The elliptical machine of claim 5, wherein, The tooth ratio of the first sprocket and the second sprocket is 2:1, so that the movement track of the pedal assembly is oval.

9. Elliptical trainer according to claim 7 or 8, characterized in that A compression seat is further arranged on the first crank, and a compression device is arranged on the compression seat to adjust the relative distance between the chain and the first crank and adjust the tension of the chain.

10. The elliptical machine of claim 9, wherein, The compression device includes a tensioner assembly and a compression assembly, a hollow track is arranged in the middle of the compression seat for the movement of the tensioner assembly, an adjustment through-hole is arranged on the top, the tensioner assembly is slidingly connected to the hollow track of the compression seat, so that the tensioner of the tensioner assembly abuts against the chain, the compression assembly is connected to the adjustment through-hole and abuts against the tensioner assembly, and the compression assembly can reciprocate in the adjustment through-hole to adjust the position of the tensioner assembly in the hollow track by adjusting the position of the compression assembly in the adjustment through-hole, thereby adjusting the tension of the chain.

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