Strength training machine

Abstract

The present invention discloses a strength training machine, comprising a motor, a winding wheel, a transmission shaft, a moving mechanism and a clutch mechanism. The motor is connected to the transmission shaft, and two winding wheels are sleeved on the transmission shaft. The moving mechanism is connected to the two winding wheels. When the pull rope is pulled to drive the winding wheels to rotate, the moving mechanism will cause the winding wheels to move axially along the transmission shaft. The clutch mechanism includes a first limiting portion and a transmission assembly. The first limiting portion is provided on the winding wheel, and the transmission assembly is provided on the transmission shaft. The transmission shaft has a receiving cavity. The outer peripheral surface of the transmission shaft is provided with two strip grooves extending along the axial direction of the transmission shaft and connecting the receiving cavity. The transmission assembly is passed through the receiving cavity, and the two ends of the transmission assembly extend out of the receiving cavity through the two strip grooves respectively. When the pull rope is pulled to rotate the winding wheel, the transmission assembly will engage with the first limiting portion on the rotating winding wheel, and the motor can provide resistance to the rotating winding wheel, thereby meeting the user's needs for unilateral training or bilateral training.

Description

Technical Field

[0001] The present invention relates to the field of fitness equipment, in particular to a strength training machine. Background Art

[0002] To achieve compact size and multifunctionality for use in various settings, including at home, strength training equipment typically uses a motor (or other resistance sources such as magnetic control, friction, or springs) as the resistance source. Two resistance sources are typically provided, outputting resistance from both ends of the equipment to achieve a variety of training movements, such as bilateral and unilateral training, to achieve strength training. The need for two motors increases the cost of these strength training machines. The two motors also result in inconsistent pulling force on both sides during bilateral training, making the equipment more difficult to control. Summary of the Invention

[0003] The purpose of the embodiments of the present invention is to provide a strength training machine that is low in cost and can achieve both unilateral and bilateral training.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A strength training machine is provided, comprising a motor and a damping unit, wherein the damping unit comprises two winding wheels, each of which is wound with a pull rope, and the damping unit further comprises:

[0006] a transmission shaft, the motor is connected to the transmission shaft and outputs torque through the transmission shaft, and the two winding wheels are sleeved on the transmission shaft;

[0007] A moving mechanism, wherein the moving mechanism is connected to the two winding wheels, and when the pull rope is pulled to drive the winding wheels to rotate, the moving mechanism causes the winding wheels to move axially along the transmission shaft;

[0008] A clutch mechanism, the clutch mechanism comprising a first limiting portion and a transmission assembly, the first limiting portion being provided on the winding reel, the transmission assembly being provided on the transmission shaft, the transmission shaft having an accommodating cavity, the outer circumferential surface of the transmission shaft being provided with two strip grooves extending along the axial direction of the transmission shaft, the two strip grooves being connected through the accommodating cavity, the transmission assembly being provided in the accommodating cavity, and the two ends of the transmission assembly respectively extending out of the accommodating cavity through the two strip grooves;

[0009] When the two winding wheels rotate simultaneously, the transmission assembly engages with the first limiting portions on both winding wheels; when only one winding wheel rotates, the transmission assembly only engages with the first limiting portion on the rotating winding wheel.

[0010] The beneficial effects are as follows: a strength training machine includes a motor and a damping unit, the damping unit including two reels, each of which is wound with a pull rope, and the damping unit also includes a transmission shaft, a moving mechanism, and a clutch mechanism. The transmission shaft is connected to the motor, and the two reels are each mounted on the transmission shaft. The moving mechanism is connected to the two reels. When the pull rope is pulled to drive the reels to rotate, the moving mechanism causes the reels to move axially along the transmission shaft. The clutch mechanism includes a first limiting portion and a transmission assembly. The first limiting portion is provided on the reels, and the transmission assembly is provided on the transmission shaft. The transmission shaft has a receiving cavity, and the outer peripheral surface of the transmission shaft is provided with two strip grooves extending along the axial direction of the transmission shaft and connecting the receiving cavity. The transmission assembly is provided in the receiving cavity, and the two ends of the transmission assembly extend out of the receiving cavity through the two strip grooves. When the two reels rotate simultaneously, the transmission assembly engages with the first limiting portion on both reels. When only one reel rotates, the transmission assembly engages only with the first limiting portion on the rotating reel. By engaging the transmission assembly with the first limiting portion, the transmission force applied by the motor can be provided to the winding reels, thereby providing resistance to the movement of the winding reels. At the same time, when both winding reels are pulled simultaneously, both winding reels can be subjected to the resistance provided by the motor, while when only one winding reel is pulled, only the pulled winding reel is subjected to the resistance provided by the motor. In this way, it is possible to provide both winding reels with resistance when moving simultaneously with only one motor, or only one winding reel with resistance, thereby meeting the needs of users for unilateral or bilateral training. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0012] Figure 1 This is a schematic diagram of an exploded view of the strength training machine (without a frame) according to the first embodiment of the present invention.

[0013] Figure 2 This is a cross-sectional view of the strength training machine (without a frame) described in the first embodiment of the present invention.

[0014] Figure 3 Schematic diagram of the strength training machine (without a frame) according to the first embodiment of the present invention.

[0015] Figure 4 This is a schematic diagram of the strength training machine described in the first embodiment of the present invention.

[0016] Figure 5 This is a schematic diagram of an exploded view of a strength training machine (without a frame) according to a second embodiment of the present invention.

[0017] Figure 6 Schematic diagram of a torsion spring according to a second embodiment of the present invention.

[0018] Figure 7Schematic diagram of the strength training machine (without a frame) according to the second embodiment of the present invention.

[0019] Figure 8 Schematic diagram of the strength training machine (without a frame) according to the second embodiment of the present invention (when pulling the first pulling rope).

[0020] In the figure:

[0021] 10. Winding wheel; 101. First winding wheel; 102. Second winding wheel; 103. First transmission part; 20. Pulling rope; 201. First pulling rope; 202. Second pulling rope; 30. Transmission shaft; 301. Accommodation cavity; 40. Moving mechanism; 401. First moving mechanism; 402. Second moving mechanism; 403. Second transmission part; 50. First limiting part; 60. Second limiting part; 70. Motor; 80. Support; 801. First groove wall; 802. Second groove wall; 90. Frame;

[0022] 11. Gear; 12. Rack; 121. First rack; 122. Second rack; 13. Elastic member; 131. First spring; 14. First shaft; 15. First hole; 16. First fastener;

[0023] 21. Limiting rod; 22. Torsion spring; 221. Pressing part; 222. Rotating part; 223. Fixed part; 23. Second shaft; 24. Second hole; 25. Second fastener; 26. Fixed protrusion. Detailed implementation mode

[0024] To make the technical problems solved by the present invention, the technical solutions adopted and the achieved technical effects clearer, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0025] As Figures 1 to 8 shown, the present invention provides a strength training machine, including a motor 70 and a damping unit. The damping unit includes two winding wheels 10, and each winding wheel 10 is wound with a pulling rope 20. The damping unit further includes a transmission shaft 30, a moving mechanism 40 and a clutch mechanism. The moving mechanism 40 is sleeved on the transmission shaft 30, and the two winding wheels 10 are also sleeved on the transmission shaft 30 and are both arranged on the moving mechanism 40, while the clutch mechanism is arranged between the two winding wheels 10 to realize the abutment or separation of the winding wheel 10 and the transmission shaft 30.

[0026] Specifically, the moving mechanism 40 is connected to the two wire winding wheels 10. When the pulling rope 20 is pulled to drive the wire winding wheel 10 to rotate, the moving mechanism 40 can move the wire winding wheel 10 along the axial direction of the transmission shaft 30. That is, the moving mechanism 40 provided in this embodiment can convert the circumferential rotation of the wire winding wheel 10 into the movement along the axial direction of the transmission shaft 30. The specific structure of the moving mechanism 40 and its connection relationship with the wire winding wheel 10 will be described in detail below. In addition, in addition to the above-mentioned pulling of the pulling rope 20 to move the wire winding wheel 10 along the axial direction of the transmission shaft 30, when the wire winding wheel 10 abuts against the transmission shaft 30 through the clutch mechanism, the torque output by the motor 70 through the transmission shaft 30 can also make the wire winding wheel 10 rotate on the moving mechanism 40, that is, move along the axial direction of the transmission shaft 30. However, the force provided by the motor 70 to move the wire winding wheel 10 is opposite to the force of pulling the pulling rope 20 to move the wire winding wheel 10. That is, when the pulling rope 20 is pulled, the power provided by the motor 70 is damping power, that is, the power of the motor 70 increases the difficulty of pulling the pulling rope 20; when the pulling rope 20 is recovered, the power provided by the motor 70 is recovery power, that is, the power of the motor 70 makes the wire winding wheel 10 rotate, so that the pulling rope 20 is wound around the wire winding wheel 10.

[0027] As Figure 1 shown, there are two moving mechanisms 40, including a first moving mechanism 401 and a second moving mechanism 402. The wire winding wheel 10 includes a first wire winding wheel 101 and a second wire winding wheel 102. A first pulling rope 201 is wound around the first wire winding wheel 101, and a second pulling rope 202 is wound around the second wire winding wheel 102. The first moving mechanism 401 is in transmission connection with the first wire winding wheel 101, and the second moving mechanism 402 is in transmission connection with the second wire winding wheel 102. Among them, the first wire winding wheel 101 and the second wire winding wheel 102 are arranged between the first moving mechanism 401 and the second moving mechanism 402, and a first transmission part 103 is arranged on both the first wire winding wheel 101 and the second wire winding wheel 102. The first transmission part 103 protrudes from the end face of the first wire winding wheel 101 close to the first moving mechanism 401 and the end face of the second wire winding wheel 102 close to the second moving mechanism 402. Second transmission parts 403 are arranged on both the first moving mechanism 401 and the second moving mechanism 402. The second transmission part 403 is arranged at one end of the first moving mechanism 401 close to the first wire winding wheel 101 and one end of the second moving mechanism 402 close to the second wire winding wheel 102. The second transmission part 403 is a cylindrical structure, and a thread matching the first transmission part 103 is arranged on the inner peripheral surface of the second transmission part 403. When the first transmission part 103 passes through the second transmission part 403, screw transmission can be realized between the first wire winding wheel 101 and the first moving mechanism 401, and between the second wire winding wheel 102 and the second moving mechanism 402.

[0028] In another embodiment, the winding wheel 10 can be set as an annular structure, with threads provided on the inner peripheral surface of the winding wheel 10. One end of the moving mechanism 40 close to the winding wheel 10 is still provided with a second transmission part 403, and threads matching the winding wheel 10 are provided on the outer peripheral surface of the second transmission part 403. When the winding wheel 10 is sleeved on the second transmission part 403, a threaded drive can be achieved between the winding wheel 10 and the moving mechanism 40.

[0029] On this basis, when the user pulls the first drawstring 201 to rotate the first winding wheel 101, the first winding wheel 101 is restricted by the threaded drive with the first moving mechanism 401. While rotating, the first winding wheel 101 will move axially along the transmission shaft 30 towards the middle of the transmission shaft 30. When the user pulls the second drawstring 202 to rotate the second winding wheel 102, the second winding wheel 102 is restricted by the threaded drive with the second moving mechanism 402. While rotating, the second winding wheel 102 will move axially along the transmission shaft 30 towards the middle of the transmission shaft 30. The first winding wheel 101 and the second winding wheel 102 have threads with opposite helix directions. Therefore, when pulling the first drawstring 201 and the second drawstring 202 to drive the first winding wheel 101 and the second winding wheel 102 to rotate, the first winding wheel 101 and the second winding wheel 102 will move axially along the transmission shaft 30 under the action of the moving mechanism 40 to approach each other. When recovering the first drawstring 201, the first winding wheel 101 is driven by the motor 70 and will rotate in the direction opposite to that when pulling the first drawstring 201, and at the same time will also move axially along the transmission shaft 30 away from the middle of the transmission shaft 30. When recovering the second drawstring 202, the second winding wheel 102 is driven by the motor 70 and will rotate in the direction opposite to that when pulling the second drawstring 202, and at the same time will also move axially along the transmission shaft 30 away from the middle of the transmission shaft 30, and the first winding wheel 101 and the second winding wheel 102 will move away from each other.

[0030] In another embodiment, there is one moving mechanism 40, which is arranged between the first winding wheel 101 and the second winding wheel 102. First transmission parts 103 are arranged on both the first winding wheel 101 and the second winding wheel 102. The first transmission part 103 protrudes from the end face of the first winding wheel 101 close to the moving mechanism 40 and the end face of the second winding wheel 102 close to the moving mechanism 40, and external threads are arranged on the first transmission part 103. The moving mechanism 40 can be arranged as a cylindrical structure, and internal threads matching the external threads of the first transmission part 103 are arranged on the inner wall of the cylindrical structure. The first transmission parts 103 of the two winding wheels 10 are both inserted into the cylindrical structure, so that the two winding wheels 10 and the moving mechanism 40 realize screw drive. Optionally, the cylindrical structure has a through inner cavity, and the first transmission parts 103 of the two winding wheels 10 both pass through the inner cavity. Optionally, the cylindrical structure has a non-through first inner cavity and a second inner cavity, wherein the first transmission part 103 of the first winding wheel 101 passes through the first inner cavity, and the first transmission part 103 of the second winding wheel 102 passes through the second inner cavity. In this embodiment, when the user pulls the first pull rope 201 and the second pull rope 202, the first winding wheel 101 and the second winding wheel 102 will move away from the middle of the transmission shaft 30 along the axial direction of the transmission shaft 30 while rotating, that is, the first winding wheel 101 and the second winding wheel 102 move away from each other; when the first pull rope 201 and the second pull rope 202 are recovered, the first winding wheel 101 and the second winding wheel 102 will rotate in the opposite direction to that during the aforementioned pulling, and at the same time move close to the middle of the transmission shaft 30 along the axial direction of the transmission shaft 30, that is, the first winding wheel 101 and the second winding wheel 102 move close to each other.

[0031] Optionally, the clutch mechanism includes a first limiting portion 50 and a transmission assembly. The first limiting portion 50 is provided on both of the two wire winding wheels 10. The transmission assembly is disposed on the transmission shaft 30 and between the two wire winding wheels 10, and the transmission assembly can be engaged or disengaged with the first limiting portion 50. The function of setting the transmission assembly is that when the transmission assembly is engaged with the first limiting portion 50, the transmission assembly, the wire winding wheel 10 and the transmission shaft 30 can have the same-direction rotation. This same-direction rotation includes driving the transmission shaft 30 to rotate by using the motor 70, and the transmission shaft 30 drives the wire winding wheel 10 to rotate through the transmission assembly, or pulling the pull rope 20 to make the wire winding wheel 10 rotate, and the wire winding wheel 10 drives the transmission shaft 30 to rotate through the transmission assembly, so as to realize the force transmission between the motor 70 and the wire winding wheel 10. When the transmission assembly is separated from the first limiting portion 50, there is no mutual acting force between the wire winding wheel 10, the transmission shaft 30 and the motor 70. Among them, the transmission assembly can be simultaneously engaged with the first limiting portions 50 of the two wire winding wheels 10, or can be only engaged with the first limiting portion 50 of one of the wire winding wheels 10 and separated from the first limiting portion 50 of the other wire winding wheel 10, so as to realize that the motor 70 applies resistance to the two wire winding wheels 10 simultaneously, or only applies resistance to one of the wire winding wheels 10. Optionally, in this embodiment, the first limiting portion 50 is a limiting block protruding from the end face of the wire winding wheel 10. However, in another embodiment, the first limiting portion 50 can also be a limiting groove recessed from the end face of the wire winding wheel 10.

[0032] Specifically, the two ends of the transmission assembly always maintain simultaneous and reverse movement along the axial direction of the transmission shaft 30. For example, when one end of the transmission assembly moves to the right along the axial direction of the transmission shaft 30, the other end of the transmission assembly simultaneously moves to the left along the axial direction of the transmission shaft 30, and the moving distances of the two ends are equal. In the initial position of the wire winding wheel 10 (the position where the wire winding wheel 10 is located when the pull rope 20 is not pulled), the two ends of the transmission assembly respectively abut against the first wire winding wheel 101 and the second wire winding wheel 102, so as to apply a pressure along the axial direction of the transmission shaft 30 to the first wire winding wheel 101 and the second wire winding wheel 102, and the two ends of the transmission assembly always have a tendency to move towards the first wire winding wheel 101 and the second wire winding wheel 102, that is, the end of the transmission assembly abutting against the first wire winding wheel 101 always has a tendency to move towards the first wire winding wheel 101, and the end of the transmission assembly abutting against the second wire winding wheel 102 always has a tendency to move towards the second wire winding wheel 102.

[0033] When the first wire winding wheel 101 and the second wire winding wheel 102 rotate simultaneously, the transmission assembly will be engaged with the first limiting portions 50 on both wire winding wheels 10, and if only one wire winding wheel 10 rotates, the transmission assembly will be only engaged with the first limiting portion 50 on the rotating wire winding wheel 10. As Figure 2 shown, the following takes the case of setting two moving mechanisms 40 as an example to illustrate the action principle of the transmission assembly and the wire winding wheel 10:

[0034] When the first winding wheel 101 and the second winding wheel 102 are pulled by the pull rope 20 and rotate simultaneously, the first winding wheel 101 moves axially to the right along the transmission shaft 30 under the action of the first moving mechanism 401, and the second winding wheel 102 moves axially to the left along the transmission shaft 30 under the action of the second moving mechanism 402. At this time, both ends of the transmission assembly are pressed by the first winding wheel 101 and the second winding wheel 102 respectively and move simultaneously and towards each other, that is, move towards the middle of the transmission shaft 30 at the same time, and always remain engaged with the first limiting portion 50 of the two winding wheels 10; when the pull rope 20 is retracted, the first winding wheel 101 and the second winding wheel 102 rotate in the opposite direction simultaneously. The first winding wheel 101 moves axially to the left along the transmission shaft 30 under the action of the first moving mechanism 401, and the second winding wheel 102 moves axially to the right along the transmission shaft 30 under the action of the second moving mechanism 402. Since both ends of the transmission assembly always have a tendency to move towards the first winding wheel 101 and the second winding wheel 102, one end of the transmission assembly pressing against the first winding wheel 101 moves to the left with the first winding wheel 101 and remains engaged with the first limiting portion 50 of the first winding wheel 101, and one end of the transmission assembly pressing against the second winding wheel 102 moves to the right with the second winding wheel 102 and remains engaged with the first limiting portion 50 of the second winding wheel 102.

[0035] When only the first winding wheel 101 is pulled by the pull rope 20 and rotates, the first winding wheel 101 moves axially to the right along the transmission shaft 30 under the action of the first moving mechanism 401, and the second winding wheel 102 remains stationary. At this time, one end of the transmission assembly close to the first winding wheel 101 is pressed by the first winding wheel 101 and moves to the right, and always remains engaged with the first limiting portion 50 of the first winding wheel 101. Since both ends of the transmission assembly always move simultaneously and in the opposite direction, one end of the transmission assembly close to the second winding wheel 102 moves to the left at the same time, so the transmission assembly is separated from the first limiting portion 50 of the second winding wheel 102. When the pull rope 20 is retracted, the first winding wheel 101 rotates in the opposite direction and moves axially to the left along the transmission shaft 30 under the action of the first moving mechanism 401. One end of the transmission assembly pressing against the first winding wheel 101 moves to the left with the first winding wheel 101, while one end of the transmission assembly close to the second winding wheel 102 moves to the right at the same time until it is engaged with the first limiting portion 50 of the second winding wheel 102.

[0036] When the transmission assembly is engaged with the first limiting portion 50, the force transmission between the motor 70, the transmission shaft 30, the clutch mechanism and the winding wheel 10 can be realized. When the transmission assembly is separated from the first limiting portion 50, the above force transmission will disappear. Therefore, this structural design enables the strength training machine to have only one motor 70, so that the two winding wheels 10 can have resistance simultaneously when being pulled simultaneously, or one winding wheel 10 can have resistance when being pulled alone, to meet the needs of users for unilateral training or bilateral training.

[0037] Example 1

[0038] like Figures 1 to 4 As shown, this embodiment provides a strength training machine, wherein both ends of the transmission assembly have second limiting portions 60, and the engagement of the transmission assembly with the first limiting portion 50 is the engagement of the second limiting portion 60 with the first limiting portion 50. The transmission shaft 30 has a receiving cavity 301, and the receiving cavity 301 is through in an axial direction perpendicular to the transmission shaft 30. The transmission assembly is placed in the receiving cavity 301, but the second limiting portions 60 at both ends extend outside the receiving cavity 301 so as to respectively abut against the two reels 10 and the first limiting portions 50 thereon. When the user pulls the pull rope 20 to move the reels 10, on the one hand, the engagement of the first limiting portion 50 with the second limiting portion 60 causes the transmission assembly to rotate in the same direction as the first limiting portion 50 it is engaged with. On the other hand, the abutment of the end surface of the reel 10 with the second limiting portion 60 causes the second limiting portion 60 of the transmission assembly to move in the same direction as the reel 10 it is abutting.

[0039] Optionally, two strip-shaped grooves extending along the axial direction of the transmission shaft 30 are provided on the outer circumferential surface of the transmission shaft 30. The two strip-shaped grooves are arranged opposite to each other perpendicular to the axial direction of the transmission shaft 30 and penetrate the accommodating cavity 301. The two second limiting portions 60 can extend out of the accommodating cavity 301 through the two strip-shaped grooves respectively. When the reel 10 moves along the axial direction of the transmission shaft 30, thereby pushing the second limiting portion 60 to move along the axial direction of the transmission shaft 30, the provision of the strip-shaped grooves provides a guide for the movement of the second limiting portion 60, so that the second limiting portion 60 can always move along the axial direction of the transmission shaft 30. In addition, the length of the strip groove in the axial direction of the transmission shaft 30 is much greater than the width perpendicular to the axial direction of the transmission shaft 30. Preferably, the width of the strip groove is equal to the width of the second limiting portion 60 in this direction, so that the provision of the strip groove hinders the circumferential rotation of the second limiting portion 60, that is, ensures that the relative positions of the second limiting portion 60 and the transmission shaft 30 in the circumferential direction remain consistent regardless of whether the pull rope 20 is being pulled or retracted, and ensures that the second limiting portion 60 reliably abuts the first limiting portion 50. When the second limiting portion 60 abuts the first limiting portion 50, the reel 10 and the transmission shaft 30 are in transmission connection, and the torque output by the motor 70 through the transmission shaft 30 can be transmitted to the reel 10 through the transmission assembly.

[0040] In this embodiment, the transmission assembly includes a gear 11 and a rack 12 that are in meshing transmission. The second limiting portion 60 is disposed on the rack 12. The rack 12 is arranged parallel to the axial direction of the transmission shaft 30 and is disposed in the accommodating cavity 301 together with the gear 11. When the second limiting portion 60 is pressed and driven by the wire winding wheel 10, the rack 12 moves and drives the gear 11 meshing with the rack 12 to rotate. The gear 11 rotates around an axis perpendicular to the axial direction of the transmission shaft 30, so that the moving directions of the rack 12 and the second limiting portion 60 are always along the axial direction of the transmission shaft 30. Further, in order to ensure reliable abutment and separation between the first limiting portion 50 and the second limiting portion 60, the transmission assembly further includes an elastic member 13 disposed in the accommodating cavity 301. The elastic member 13 is arranged parallel to the rack 12. One end of the elastic member 13 abuts against the rack 12, and the other end abuts against the end face of the accommodating cavity 301. The elastic member 13 always applies a thrust to the rack 12, so that the second limiting portion 60 always has a tendency to press against the wire winding wheel 10.

[0041] Optionally, the rack 12 includes a first rack 121 and a second rack 122 that are arranged in parallel, that is, the first rack 121 and the second rack 122 are respectively disposed on both sides of the circumference of the gear 11. When the second limiting portion 60 on the first rack 121 and / or the second rack 122 is pressed and driven, the first rack 121 and / or the second rack 122 move. When the gear 11 rotates, due to the meshing transmission between the gear 11 and the rack 12, at this time, the second rack 122 and the first rack 121 will move simultaneously. The first rack 121 and the second rack 122 have simultaneous and opposite-direction movements, so as to ensure that even when only one second limiting portion 60 presses against the first limiting portion 50, the two second limiting portions 60 always have simultaneous and opposite-direction movements. Specifically, a second limiting portion 60 is disposed on the side of the first rack 121 that is not meshing with the gear 11, and another second limiting portion 60 is disposed on the side of the second rack 122 that is not meshing with the gear 11, that is, the two second limiting portions 60 can move towards each other to approach each other, or move away from each other to move away from each other. Optionally, the tooth pitches of the first rack 121 and the second rack 122 are the same. Based on the principle of the meshing transmission between the gear 11 and the rack 12, the first rack 121 and the second rack 122 have opposite-direction but consistent displacements, so that the forces applied to the first wire winding wheel 101 and the second wire winding wheel 102 are the same, ensuring that the user has consistent resistance when pulling the first pull rope 201 and the second pull rope 202. In addition, because the first rack 121 and the second rack 122 need to move simultaneously, and pulling the pull rope 20 wound around a certain wire winding wheel 10 will cause the corresponding wire winding wheel 10 to move. Therefore, if only the first pull rope 201 is pulled alone, the second limiting portion 60 will be separated from the second wire winding wheel 102. If only the second pull rope 202 is pulled alone, the second limiting portion 60 will be separated from the first wire winding wheel 101. Optionally, the second limiting portion 60 is disposed perpendicular to the length direction of the rack 12.

[0042] Optionally, the elastic member 13 includes at least a first spring 131 disposed against the first rack 121. The first spring 131 is located in the accommodation cavity 301 and abuts against the moving side of the first rack 121. The moving side of the first rack 121 is the side to which the first rack 121 moves when the first pulling rope 201 or the second pulling rope 202 is pulled. As Figure 2 shown, for example, when the user only pulls the first pulling rope 201 to rotate the first winding wheel 101, the first winding wheel 101 moves relatively rightward with respect to the transmission shaft 30 and pushes the corresponding second limiting portion 60 of the first winding wheel 101 to move the first rack 121 rightward. Then, the first rack 121 squeezes the first spring 131 rightward, which can ensure that during the rotation of the first winding wheel 101, the second limiting portion 60 and the first limiting portion 50 on the first winding wheel 101 are reliably abutted. When the user releases the first pulling rope 201, the first winding wheel 101 moves relatively leftward with respect to the transmission shaft 30. Under the action of the first spring 131, the first rack 121 moves leftward and always reliably abuts against the first limiting portion 50 on the first winding wheel 101. The leftward movement of the first rack 121 drives the gear 11 to rotate, thereby simultaneously driving the second rack 122 to move rightward and approach the second winding wheel 102 until the second limiting portion 60 on the second rack 122 abuts against the second winding wheel 102.

[0043] Optionally, the elastic member 13 includes at least a second spring disposed against the moving side of the second rack 122. The moving side of the second rack 122 is the side to which the second rack 122 moves when the first pulling rope 201 or the second pulling rope 202 is pulled. Continuing with the Figure 2 direction shown as an example, the second spring is disposed on the left side of the second rack 122 at this time. When the user pulls the first pulling rope 201, the first winding wheel 101 moves relatively rightward with respect to the transmission shaft 30 and pushes the second limiting portion 60 on the first rack 121 to move the first rack 121 rightward. Then, driven by the gear 11, the second rack 122 will move leftward and squeeze the second spring. Optionally, the first spring 131 and the second spring can also be provided simultaneously, and the function of providing the elastic member 13 can be reflected when the user pulls the first pulling rope 201 and the second pulling rope 202 simultaneously or separately.

[0044] Furthermore, as Figure 1 and Figure 3 shown, both first limiting portions 50 are disposed on the end face of the winding wheel 10 close to the transmission assembly to facilitate the abutment of the second limiting portion 60 and the first limiting portion 50. And to better hinder the rotation of the winding wheel 10, the second limiting portion 60 is located on the rotation side of the first limiting portion 50. The rotation side of the first limiting portion 50 is the side to which the winding wheel 10 turns when the user pulls the pulling rope 20. In this way, when the pulling rope 20 is pulled, the second limiting portion 60 can immediately hinder the rotation of the winding wheel 10.

[0045] Specifically, the transmission assembly further includes a first shaft 14, which is used to limit the movement of the gear 11 within the accommodating cavity 301, ensuring that the gear 11 can only rotate within the accommodating cavity 301. A first hole 15 is provided on the transmission shaft 30 perpendicular to the axial direction of the transmission shaft 30, that is, the extending direction of the first hole 15 is perpendicular to the relative setting direction of the two strip-shaped grooves, so that the first shaft 14 passes through the first hole 15. When the gear 11 located within the accommodating cavity 301 is sleeved on the first shaft 14, the center line of the gear 11 coincides with the central axis of the first shaft 14 and can rotate around the axis direction of the first shaft 14. Since the first hole 15 is a through hole, the first shaft 14 sleeved with the gear 11 can pass through the transmission shaft 30, and then the first shaft 14 is fixed to the transmission shaft 30 by using a first fastener 16 to ensure the structural stability of the transmission assembly. Optionally, the first fastener 16 is a nut. One end of the first shaft 14 has a convex portion, which is located on one side of the transmission shaft 30, and the end without the convex portion can pass through the transmission shaft 30 and is located on the other side of the transmission shaft 30. This end is provided with threads and can be connected to the nut.

[0046] Optionally, the transmission shaft 30 and the output shaft of the motor 70 are separately provided. During the production process of the strength training machine, a standard motor 70 on the market can be selected, and then the output shaft of the motor 70 is connected to the transmission shaft 30, which simplifies the production process and reduces costs. Optionally, a key drive is adopted between the transmission shaft 30 and the output shaft of the motor 70.

[0047] In another embodiment, the transmission shaft 30 and the output shaft of the motor 70 can also be integrally provided. The transmission shaft 30 is the output shaft of the motor 70. Therefore, there is no need to separately provide the transmission shaft 30. The first winding wheel 101 and the second winding wheel 102 are sequentially sleeved on the outer periphery of the output shaft of the motor 70 along the axial direction of the output shaft of the motor 70. Moreover, in this way, there is no need to provide a transmission mechanism between the transmission shaft 30 and the output shaft, which can make the structure of the damping unit simpler and more compact.

[0048] Optionally, as Figure 4 ​As shown, the strength training machine provided in this embodiment also includes a frame 90, and the damping unit also includes a support 80, wherein one side of the support 80 is connected to the frame 90, and the other side of the support 80 is provided with a mounting groove, the mounting groove having two opposite groove walls, and two movable mechanisms 40 are provided, one movable mechanism 40 is provided on each groove wall, the motor 70 is provided on any groove wall, and the winding wheel 10 and the clutch mechanism are both provided in the mounting groove. Optionally, the mounting groove includes a first groove wall 801 and a second groove wall 802 opposite to each other, the motor 70 is provided on the first groove wall 801, and the transmission shaft 30 is rotatably connected to the second groove wall 802 at one end away from the motor 70. By providing the support 80, the support 80 can provide a connection and support for the damping unit and the frame 90, thereby facilitating the assembly of the strength training machine. Optionally, the movable mechanism 40 includes a mounting portion, the mounting portion is provided with a first mounting hole, and the groove wall is provided with a second mounting hole opposite to each other. Bolts can be used to pass through the second mounting hole and the first mounting hole in sequence to fix the movable mechanism 40 to the groove wall. Optionally, the first mounting hole is a threaded hole, and the second mounting hole is a through hole. Figure 1 As shown, in this embodiment, the mounting portion is an annular structure, and a plurality of first mounting holes are arranged at intervals in the circumferential direction of the mounting portion.

[0049] In another embodiment, if only one movable mechanism 40 is provided, a mounting groove is provided on the other side of the bracket 80. The mounting groove has two opposing groove walls and a middle wall provided between the two groove walls. The middle wall divides the mounting groove into a first mounting groove and a second mounting groove. The first winding wheel 101 is provided in the first mounting groove, the second winding wheel 102 is provided in the second mounting groove, the motor 70 is provided on any groove wall, the movable mechanism 40 is provided on the middle wall, the clutch mechanism passes through the movable mechanism 40, a portion of the clutch mechanism is located in the first mounting groove, and another portion of the clutch mechanism is located in the second mounting groove. Specifically, the transmission shaft 30 is provided in the movable mechanism 40, the rack 12 is provided in the accommodating cavity 301 of the transmission shaft 30, and the second limiting portion 60 extends out of the accommodating cavity 301 and presses against the end face of the winding wheel 10 facing away from the movable mechanism 40, that is, the first limiting portion 50 is provided on the end face of the winding wheel 10 facing away from the movable mechanism 40.

[0050] Example 2

[0051] The strength training machine provided in this embodiment is different from the strength training machine in the first embodiment in that:

[0052] like Figures 5 to 8As shown, the transmission assembly includes a torsion spring 22 and a limiting rod 21. The two ends of the limiting rod 21 are the second limiting portions 60. When the limiting rod 21 is inserted into the accommodating cavity 301, the two second limiting portions 60 can both extend out of the accommodating cavity 301, and the two second limiting portions 60 can respectively press against the two first limiting portions 50 on the first winding wheel 101 and the second winding wheel 102. The torsion spring 22 is fixed on the transmission shaft 30, and one end of it presses against the limiting rod 21. The function of the torsion spring 22 is to apply an external force to the limiting rod 21 to increase the force when the limiting rod 21 presses against the first winding wheel 101 and the second winding wheel 102. The direction of the force applied by the torsion spring 22 to the limiting rod 21 needs to be opposite to the direction in which the winding wheel 10 moves when pulling the pull rope 20, so that the second limiting portion 60 is always in contact with the moving winding wheel 10.

[0053] Optionally, the torsion spring 22 can press against one end of the limiting rod 21 that presses against the first winding wheel 101, or one end of the limiting rod 21 that presses against the second winding wheel 102. Moreover, because the limiting rod 21 is in a rod-shaped structure, the angle between any end of the limiting rod 21 and the transmission shaft 30 is the same. Pressing against any end of the limiting rod 21 by the torsion spring 22 can simultaneously play the same obstructive role on the first winding wheel 101 and the second winding wheel 102, ensuring that the user has the same resistance when pulling the first pull rope 201 and the second pull rope 202. In addition, the rotation of the limiting rod 21 relative to the transmission shaft 30 causes the two ends of the limiting rod 21 to simultaneously move closer to or away from each other along the axial direction of the transmission shaft 30.

[0054] Optionally, when the user pulls the first pull rope 201 and the second pull rope 202 simultaneously, the first winding wheel 101 and the second winding wheel 102 will simultaneously move towards the middle of the transmission shaft 30. The first limiting portion 50 on the winding wheel 10 and the end face of the winding wheel 10 will press against the two second limiting portions 60 of the limiting rod 21 and force the limiting rod 21 to rotate, so that the two second limiting portions 60 move closer to each other along the axial direction of the transmission shaft 30. When the user only pulls the first pull rope 201, the first winding wheel 101 will move towards the middle of the transmission shaft 30, while the position of the second winding wheel 102 remains unchanged. At this time, the first limiting portion 50 on the first winding wheel 101 and the end face of the first winding wheel 101 will press against the second limiting portion 60 close to the first winding wheel 101. However, due to the structure of the limiting rod 21 itself, when an external force parallel to the axial direction of the transmission shaft 30 is applied to one side of the second limiting portion 60, the limiting rod 21 can rotate, so that the two second limiting portions 60 move closer to each other along the axial direction of the transmission shaft 30. Optionally, the second limiting portion 60 is the part of the limiting rod 21 that presses against the first limiting portion 50 and the end face of the winding wheel 10. As the position of the winding wheel 10 changes, the part of the limiting rod 21 that presses against the winding wheel 10 will change. That is, in this embodiment, the second limiting portion 60 is variable.

[0055] Further, to enable the limiting rod 21 to rotate relative to the transmission shaft 30 and the second limiting portion 60 to press against the first winding wheel 101 and the second winding wheel 102, the transmission assembly further includes a second shaft 23. The limiting rod 21 is sleeved on the second shaft 23 and can rotate relative to the second shaft 23, while the second shaft 23 is fixed to the transmission shaft 30. As Figure 5 shown, the fixing of the second shaft 23 to the transmission shaft 30 is achieved by providing a second hole 24 on the transmission shaft 30. The second hole 24 is a through hole provided perpendicular to the axial direction of the transmission shaft 30. When the second shaft 23 sleeved with the limiting rod 21 passes through the second hole 24, it can not only limit the movement of the second shaft 23 except in its axial direction, but also limit the limiting rod 21 to rotate only around the second shaft 23. Then, a second fastener 25 is used to fix the second shaft 23 to the transmission shaft 30 to ensure the structural stability of the transmission assembly. Optionally, the second fastener 25 is a nut. One end of the second shaft 23 has a convex portion located on one side of the second transmission shaft 30, and the end without the convex portion passes through the second transmission shaft 30 and is located on the other side of the second transmission shaft 30. This end is provided with a thread and can be connected to the nut.

[0056] Furthermore, based on the self-structure of the torsion spring 22, if the torsion spring 22 is only sleeved on the second shaft 23, it can rotate driven by the second shaft 23. To ensure the pressing effect of the torsion spring 22 on the limiting rod 21, a fixing protrusion 26 is further provided on the transmission shaft 30. As Figure 6 shown, the torsion spring 22 includes a pressing portion 221, a rotating portion 222 and a fixing portion 223 which are integrally provided. The rotating portion 222 is sleeved on the second shaft 23, and the fixing portion 223 is sleeved on the fixing protrusion 26. The torsion spring 22 always applies pressure to the limiting rod 21 through its own elasticity. By these two points, it can be ensured that the torsion spring 22 does not rotate, and the pressing portion 221 presses against the limiting rod 21 to force the two ends of the limiting rod 21 to always have a tendency to approach the first winding wheel 101 and the second winding wheel 102. Optionally, the fixing protrusion 26 is arranged parallel to the second hole 24.

[0057] The strength training machine provided in this embodiment can provide unilateral training or bilateral training for users. Refer to Figure 7When the user performs bilateral training, the first pulling rope 201 and the second pulling rope 202 need to be pulled. The first wire winding wheel 101 and the second wire winding wheel 102 can rotate around the transmission shaft 30 under the drive of the pulling ropes 20. At the same time, based on the screw drive between the wire winding wheel 10 and the moving mechanism 40, the first wire winding wheel 101 and the second wire winding wheel 102 will also move axially along the transmission shaft 30 towards the middle of the transmission shaft 30. At this time, the two second limiting parts 60 of the limiting rod 21 will press against the first limiting part 50 on the wire winding wheel 10 and the end face of the wire winding wheel 10. Moreover, the limiting rod 21 is disposed in the accommodating cavity 301 and sleeved on the second shaft 23. When the second limiting part 60 of the limiting rod 21 is combined with the first limiting part 50, the limiting rod 21 can be rotated in the same direction as the wire winding wheel 10. And through the pressing of the second limiting part 60 of the limiting rod 21 against the end face of the wire winding wheel 10, the limiting rod 21 will also rotate around the second shaft 23, that is, the two second limiting parts 60 approach each other.

[0058] Refer to Figure 8 When the user only pulls the first pulling rope 201 alone, then at this time the first wire winding wheel 101 rotates and moves to the right, while the second wire winding wheel 102 remains stationary. At this time, the first limiting part 50 on the first wire winding wheel 101 will push the limiting rod 21 to rotate around the second shaft 23, and the two second limiting parts 60 on the limiting rod 21 approach each other axially along the transmission shaft 30. Therefore, the second limiting part 60 close to the second wire winding wheel 102 will separate from the second wire winding wheel 102 and will not exert any external force on the second wire winding wheel 102.

[0059] In addition, the remaining structures of the strength training machine provided in this embodiment are the same as those of the strength training machine in Embodiment 1, and will not be described in detail here.

Claims

1. A strength training machine, comprising a motor and a damping unit, the damping unit including two wire winding wheels, and a pull rope is wound around each of the wire winding wheels, characterized in that, The damping unit further includes: A transmission shaft, the motor is connected to the transmission shaft, and torque is output through the transmission shaft, and two of the wire winding wheels are sleeved on the transmission shaft; A moving mechanism, the moving mechanism is connected to the two wire winding wheels, when pulling the pulling rope to drive the wire winding wheel to rotate, the moving mechanism moves the wire winding wheel along the axial direction of the transmission shaft; A clutch mechanism, the clutch mechanism includes a first limiting portion and a transmission component, the first limiting portion is arranged on the wire winding wheel, the transmission component is arranged on the transmission shaft, the transmission shaft has a receiving cavity, two strip-shaped grooves are arranged on the outer peripheral surface of the transmission shaft along the axial direction of the transmission shaft, and the two strip-shaped grooves are communicated through the receiving cavity, the transmission component is arranged in the receiving cavity, and both ends of the transmission component respectively extend out of the receiving cavity through the two strip-shaped grooves; Both ends of the transmission component always move simultaneously and in opposite directions along the axial direction of the transmission shaft. When one end of the transmission component moves to the right along the axial direction of the transmission shaft, the other end of the transmission component simultaneously moves to the left along the axial direction of the transmission shaft, and the moving distances of both ends are equal; in the initial position of the wire winding wheel, both ends of the transmission component respectively abut against the first wire winding wheel and the second wire winding wheel, so as to apply a pressure along the axial direction of the transmission shaft to the first wire winding wheel and the second wire winding wheel, and both ends of the transmission component always have a tendency to move towards the first wire winding wheel and the second wire winding wheel; When the two wire winding wheels rotate simultaneously, the transmission component engages with the first limiting portions on the two wire winding wheels. When only one wire winding wheel rotates, the transmission component only engages with the first limiting portion on the rotating wire winding wheel.

2. The strength training machine according to claim 1, characterized in that, Both ends of the transmission component have second limiting portions, the receiving cavity penetrates through in a direction perpendicular to the axial direction of the transmission shaft, and the two second limiting portions respectively extend out of the receiving cavity through the two strip-shaped grooves.

3. The strength training machine according to claim 2, characterized in that, When the transmission component engages with the first limiting portion on the wire winding wheel, the second limiting portion presses against the end face of the wire winding wheel, and any movement of the wire winding wheel along the axial direction of the transmission shaft can drive the two second limiting portions to move towards each other or in opposite directions simultaneously.

4. The strength training machine according to claim 2, wherein, The transmission component includes a gear, a rack and an elastic member arranged in the receiving cavity, the second limiting portion is arranged on the rack, the rack can move along the axial direction of the transmission shaft under the meshing transmission of the gear, and the elastic member abuts against one end of the rack.

5. The strength training machine according to claim 4, characterized in that The rack includes a first rack and a second rack which are arranged in parallel and both mesh with the gear, one of the second limiting portions is arranged on the side of the first rack that does not mesh with the gear, and the other second limiting portion is arranged on the side of the second rack that does not mesh with the gear.

6. The strength training machine according to claim 5, characterized in that, The elastic member includes a first spring, the first spring is located in the receiving cavity and presses against the moving side of the first rack; and / or, The elastic member includes a second spring, the second spring is located in the receiving cavity and presses against the moving side of the second rack.

7. The strength training machine according to claim 4, wherein The transmission assembly further includes a first shaft. A first hole is axially provided on the transmission shaft perpendicular to the axial direction of the transmission shaft. The first shaft passes through the first hole. The gear located in the accommodating cavity is sleeved on the first shaft and can rotate relative to the first shaft.

8. The strength training machine according to claim 2, wherein, The transmission assembly includes a torsion spring and a limiting rod. The two ends of the limiting rod are the second limiting parts. The limiting rod passes through the accommodating cavity and makes the second limiting parts extend out of the accommodating cavity. The torsion spring is fixed on the transmission shaft and presses against the limiting rod.

9. The strength training machine according to claim 8, characterized in that, The transmission assembly further includes a second shaft. A second hole is axially provided on the transmission shaft perpendicular to the axial direction of the transmission shaft. The second shaft passes through the second hole. The limiting rod passing through the accommodating cavity is sleeved on the second shaft and can rotate relative to the second shaft.

10. The strength training machine according to claim 9, characterized in that, A fixing protrusion is provided on the transmission shaft. The torsion spring includes a pressing part, a rotating part and a fixing part which are integrally arranged. The rotating part is sleeved on the second shaft, the fixing part is sleeved on the fixing protrusion, and the pressing part presses against the limiting rod.

11. The strength training machine according to any one of claims 1 to 10, characterized in that, The strength training machine further includes a frame. The damping unit further includes a support. One side of the support is connected to the frame. An installation groove is provided on the other side surface of the support. The installation groove has two opposite groove walls. Two moving mechanisms are provided, and one moving mechanism is provided on each of the corresponding groove walls. The motor is provided on any one of the groove walls. The wire winding wheel and the clutch mechanism are both provided in the installation groove.

12. The strength training machine according to any one of claims 1 to 7, characterized in that, The strength training machine further includes a frame. The damping unit further includes a support. One side of the support is connected to the frame. An installation groove is provided on the other side surface of the support. The installation groove has two opposite groove walls and a middle wall provided between the two groove walls. The middle wall divides the installation groove into a first installation groove and a second installation groove. One of the wire winding wheels is provided in the first installation groove, and the other wire winding wheel is provided in the second installation groove. One moving mechanism is provided, and the moving mechanism is provided on the middle wall. The motor is provided on any one of the groove walls. The clutch mechanism passes through the moving mechanism. A part of the clutch mechanism is located in the first installation groove, and the other part is located in the second installation groove.

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