Gear shifting and speed reducing mechanism and fitness equipment

Abstract

The utility model discloses a gear shifting and speed reducing mechanism and fitness equipment. The gear shifting and speed reducing mechanism comprises a driving gear, a compound gear assembly, a gear shifting assembly and an output assembly. Multi-stage speed output is achieved through cooperative work of the driving gear, the compound gear assembly and the gear shifting assembly, a first transmission gear and a second transmission gear of the compound gear assembly provide different transmission ratios, and the gear shifting assembly controls a gear shifting gear to be switched between a low-speed gear and a high-speed gear through a gear shifting rod. Therefore, different rotating speeds are output, output of different rotating speeds and torques is achieved, rapid, impact-free and low-noise gear shifting is guaranteed, meanwhile, the gear shifting device has the advantages of being low in manufacturing cost and high in durability, and the diversified requirements of modern fitness equipment are met. Comprising the speed reducing mechanism can provide different training intensities and speed settings according to the requirements of users, and the fitness effect and the user experience are improved.

Description

Technical Field

[0001] The utility model relates to the field of mechanical transmission, in particular to a gear shifting and speed reduction mechanism and fitness equipment. Background Art

[0002] Gearshift reduction mechanisms are becoming increasingly common in modern fitness equipment, especially load-bearing fitness equipment such as Smith machines, weightlifters, and rowing machines. These gearshift reduction mechanisms are able to adjust the output speed and torque by changing the transmission ratio to suit different training needs. Currently, the gearshift solutions for fitness equipment on the market face trade-offs in terms of structural complexity, manufacturing cost, durability, and user experience. Achieving output at different speeds, outputting different speeds and torques through a gearshift mechanism, and achieving smooth, impact-free gear shifting in a lightweight structure remains a challenging problem. Utility Model Content

[0003] In order to overcome the deficiencies of the prior art, the utility model provides a smooth and impact-free gear shifting and speed reduction mechanism and fitness equipment.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] A shift reduction mechanism comprises: a drive gear, a compound gear assembly, a shift assembly, and an output assembly; the compound gear assembly comprises a first transmission gear and a second transmission gear arranged coaxially, the first transmission gear having a larger diameter than the second transmission gear, the drive gear meshing with the first transmission gear for transmission; the shift assembly comprises a shift shaft, a low-speed gear, a high-speed gear, a shift gear, a shift lever, and a third transmission gear provided on the shift shaft, the low-speed gear meshing with the second transmission gear, the high-speed gear meshing with the first transmission gear, the third transmission gear fixedly connected to the shift shaft, the shift gear fixedly connected to the shift lever, and the shift gear being driven to switch positions between the low-speed gear and the high-speed gear; when the shift gear meshes with the low-speed gear, the first transmission gear drives the low-speed gear, outputting a first rotational speed to the output assembly via the third transmission gear; when the shift gear meshes with the high-speed gear, the second transmission gear drives the high-speed gear, outputting a second rotational speed to the output assembly via the third transmission gear.

[0006] Furthermore, the shift gear is sleeved on the shift shaft, and the low-speed gear and the high-speed gear are provided with internal teeth that cooperate with the shift gear. The shift lever can drive the shift gear to engage with the low-speed gear and the high-speed gear respectively to switch the output mode.

[0007] Furthermore, it also includes a driving member, which is transmission-connected to the shift lever.

[0008] Furthermore, the driving member is a motor.

[0009] Furthermore, there are multiple driving gears, and the multiple driving gears are meshed with the first transmission gear for transmission.

[0010] Furthermore, there are two driving gears.

[0011] Furthermore, the output assembly includes an output shaft and an output gear provided on the output shaft;

[0012] The third transmission gear is engaged with the output gear, and the output gear is driven by the third transmission gear, so that the output shaft rotates.

[0013] Furthermore, a connecting portion is provided at one end of the output shaft away from the output gear, and a traction member is provided through the connecting portion. The traction member can be wound around the output shaft and output traction force.

[0014] Furthermore, the connecting portion includes a through hole provided on the output shaft, a pulley is provided in the through hole, and the traction member can be sleeved on the pulley through the through hole.

[0015] A fitness equipment, comprising the above-mentioned gear shifting and speed reduction mechanism.

[0016] The beneficial effects of the utility model are:

[0017] The utility model provides a gear shift reduction mechanism that realizes multi-speed output by cooperating with a driving gear, a compound gear assembly and a gear shift assembly, wherein the first transmission gear and the second transmission gear of the compound gear assembly provide different transmission ratios, and the gear shift assembly controls the gear shift between the low-speed gear and the high-speed gear through the shift lever, thereby outputting different rotational speeds and realizing output of different speeds and torques, ensuring rapid, impact-free and low-noise gear shifting, and having the characteristics of low manufacturing cost and high durability, so as to meet the diversified needs of modern fitness equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure of the utility model-1;

[0020] Figure 2 This is a schematic diagram of the three-dimensional structure of the utility model-2;

[0021] Figure 3 It is a front view schematic diagram of the utility model;

[0022] Figure 4 It is a cross-sectional schematic diagram of the shift assembly of the present utility model;

[0023] Figure 5 It is a partial structural exploded schematic diagram of the shift assembly of the present invention.

[0024] in,

[0025] 100, driving gear;

[0026] 200, compound gear assembly; 210, first transmission gear; 220, second transmission gear;

[0027] 300, shift assembly; 310, shift shaft; 320, low-speed gear; 330, high-speed gear; 340, shift gear; 350, shift lever; 360, third transmission gear; 370, driving member; 400, output assembly; 410, output shaft; 411, connecting part; 420, output gear. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the concept, specific structure and technical effects of the present invention in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by technical personnel in this field without creative work are within the scope of protection of the present invention. In addition, all the connection / connection relationships involved in the patent do not refer to the direct connection of components, but refer to the fact that a better connection structure can be formed by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the creation of the present invention can be combined interactively without conflicting with each other.

[0029] Reference Figure 1 、 Figure 2The present invention provides a gear shifting and speed reduction mechanism, comprising: a driving gear 100, a compound gear assembly 200, a gear shifting assembly 300 and an output assembly 400; the compound gear assembly 200 comprises a first transmission gear 210 and a second transmission gear 220 arranged coaxially, the diameter of the first transmission gear 210 being larger than that of the second transmission gear 220, the driving gear 100 meshing with the first transmission gear 210 for transmission; the gear shifting assembly 300 comprises a shifting shaft 310 and a low-speed gear 320, a high-speed gear 330, a shifting gear 340, a shifting rod 350 and a third transmission gear 360 arranged on the shifting shaft 310, the low-speed gear 320 meshing with the second transmission gear 220, the high-speed gear 330 meshing with the first transmission gear 220, The movable gear 210 is engaged, the third transmission gear 360 is fixedly connected to the shift shaft 310, and the shift gear 340 is fixedly connected to the shift lever 350. Driving the shift lever 350 can make the shift gear 340 switch positions between the low-speed gear 320 and the high-speed gear 330; when the shift gear 340 is engaged with the low-speed gear 320, the first transmission gear 210 drives the low-speed gear 320, and outputs a first rotational speed to the output assembly 400 through the third transmission gear 360; when the shift gear 340 is engaged with the high-speed gear 330, the second transmission gear 220 drives the high-speed gear 330, and outputs a second rotational speed to the output assembly 400 through the third transmission gear 360.

[0030] The utility model provides a gear shifting and speed reduction mechanism, which also includes a housing, Figure 1 The driving gear 100, the composite gear assembly 200, the shift assembly 300 and the output assembly 400 are all disposed inside the housing.

[0031] Among them, reference Figure 2 The compound gear assembly 200 has a first transmission gear 210 and a second transmission gear 220 of different sizes. The diameter of the driving gear 100 is smaller than that of the first transmission gear 210, and the diameter of the second transmission gear 220 is smaller than that of the first transmission gear 210. That is to say, after the driving gear 100 is engaged with the first transmission gear 210, the rotation speed of the compound gear assembly 200 will be reduced, thereby outputting a greater torque.

[0032] It will be appreciated that the first rotational speed is less than the second rotational speed. When the shift gear 340 meshes with the low-speed gear 320, the compound gear assembly 200 drives the low-speed gear 320 via the smaller second transmission gear 220 (relative to the first transmission gear 210), further reducing the rotational speeds of the low-speed gear 320 and the third transmission gear 360, thereby outputting the first rotational speed and thereby generating a greater torque, suitable for low-speed operating conditions requiring greater torque. When the shift gear 340 meshes with the high-speed gear 330, the compound gear assembly 200 drives the high-speed gear 330 via the larger first transmission gear 210 (relative to the second transmission gear 220), thereby outputting the second rotational speed, enabling the output assembly 400 to achieve a higher rotational speed, suitable for operating conditions requiring higher speeds.

[0033] To further increase the torque, in some embodiments, refer to Figure 2 The drive gear 100 comprises multiple drive gears 100, each of which meshes with the first transmission gear 210. As can be appreciated, increasing the number of drive gears 100 can distribute the transmission load, reducing the force borne by each drive gear 100. This reduces wear and stress concentration on individual gears, thereby improving the durability and reliability of the entire shift reduction mechanism. Furthermore, the simultaneous meshing of multiple drive gears 100 with the first transmission gear 210 significantly increases the total output torque of the transmission system, making it suitable for applications requiring higher torque.

[0034] Specifically, multiple drive gears 100 can be arranged in a symmetrical distribution around the first transmission gear 210, which can ensure uniform force during transmission and further improve transmission efficiency and stability. The number and arrangement of the drive gears 100 can be designed according to actual needs to optimize transmission performance and structural compactness.

[0035] Furthermore, each drive gear 100 is independently connected to a drive motor. Preferably, multiple motors of the same model are selected, which is equivalent to having multiple power output sources acting simultaneously on the first transmission gear 210. Multiple drive motors can operate synchronously, sharing the transmission load, reducing the load pressure of a single motor, and improving the durability and stability of the system. Preferably, there are two drive gears 100, each connected to two independent drive motors.

[0036] Specifically, the two drive gears 100 can be symmetrically arranged on either side of the first transmission gear 210. This ensures uniform force during transmission, reduces the impact of eccentric forces on the system, and further improves transmission efficiency and stability. The synchronous control of the drive motors can utilize motor control technologies, such as vector control or direct torque control (DTC), to ensure synchronous operation of multiple motors and avoid the impact of speed and phase differences on the system.

[0037] In some embodiments, reference Figure 4 、 5 The shift gear 340 is sleeved on the shift shaft 310. The low-speed gear 320 and the high-speed gear 330 are internally provided with internal teeth that mate with the shift gear 340. The shift lever 350 can drive the shift gear 340 to engage with the low-speed gear 320 and the high-speed gear 330, respectively, to switch the output mode. It will be understood that the shift gear 340 is fixed circumferentially relative to the shift shaft 310 and can only slide along the circumference of the shift shaft 310. Therefore, when the shift gear 340 switches between the low-speed gear 320 and the high-speed gear 330, the transmission between the composite gear assembly 200 and the low-speed gear 320 and the high-speed gear 330 can be switched, thereby achieving multi-gear adjustment.

[0038] Further, refer to Figure 5 , further comprising a driving member 370, which is in transmission connection with the shift lever 350. The driving member 370 can control the displacement of the shift lever 350, thereby achieving the shifting of the shift gear 340 between the low-speed gear 320 and the high-speed gear 330. This improves the degree of automation of the shifting and reduces errors and wear caused by manual operation.

[0039] Furthermore, the driving element 370 is a motor. The motor, as the driving element 370, can be controlled by an electronic control system. The motor-driven shifting system uses sensors and a controller to monitor and adjust the shifting process in real time, ensuring rapid and accurate shifting. Furthermore, the motor-driven system can have preset shifting modes to meet the needs of different operating conditions.

[0040] In some embodiments, reference Figure 4 、 5 The output assembly 400 includes an output shaft 410 and an output gear 420 disposed on the output shaft 410. The third gear engages with the output gear 420, driving the output gear 420 through the third gear, thereby rotating the output shaft 410. It is understood that the third gear can output a first speed and a second speed to the output gear 420, thereby driving the output shaft 410 to rotate.

[0041] Further, refer to Figure 2 The output shaft 410 has a connecting portion 411 at one end away from the output gear 420. A traction member is disposed through the connecting portion 411. The traction member can be wound around the output shaft 410 to output traction force. This allows the output shaft 410 to rotate and transmit linear traction through the traction member. The traction member is a rope, which can include nylon rope, polyester rope, composite rope, etc.

[0042] In some embodiments, reference Figure 2 The connecting portion 411 includes a through hole provided on the output shaft 410, a pulley is provided in the through hole, and the traction member can be sleeved on the pulley through the through hole. The through hole allows the traction member to pass through the output shaft 410 smoothly, and the guidance of the pulley reduces the friction between the traction member and the output shaft 410, thereby extending the service life of the traction member. Preferably, the pulley here can be a bearing pulley. By setting the pulley, the length of the traction member can be adjusted. After the adjustment is completed, the rotation of the output shaft 410 can cause the traction member to be wound along the circumference of the output shaft 410, thereby outputting traction force.

[0043] The utility model also provides a fitness equipment, comprising the gear shifting and speed reduction mechanism of the above embodiment.

[0044] In some embodiments, a fitness device may be a Smith machine weightlifting machine. It is understood that the fitness device may also be a load-type fitness device. This case uses a Smith machine weightlifting machine as an example.

[0045] By installing this shift and reduction mechanism at both ends of the Smith machine's weightlifting arm, the traction force provided by the shift mechanism acts on both ends of the weightlifting arm. This allows for a sudden release of force during exercise, preventing injury to the exerciser and providing additional safety. Furthermore, if the pulling force is insufficient, the controller switches gears to increase the pulling force, adapting to different users and training needs, expanding the device's applicability. This mechanism can also be applied to rowing machines, where the two gears of the shift and reduction mechanism provide different pulling forces to suit different users.

[0046] The above is a specific description of the preferred implementation of the present invention, but the invention of the present invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A gear shifting and speed reduction mechanism, characterized in that: include: drive gears, compound gear assemblies, shift assemblies, and output assemblies; The composite gear assembly includes a first transmission gear and a second transmission gear arranged coaxially, the diameter of the first transmission gear is larger than that of the second transmission gear, and the driving gear is meshed with the first transmission gear for transmission; The shift assembly includes a shift shaft and a low-speed gear, a high-speed gear, a shift gear, a shift lever, and a third transmission gear provided on the shift shaft. The low-speed gear is meshed with the second transmission gear, the high-speed gear is meshed with the first transmission gear, the third transmission gear is fixedly connected to the shift shaft, and the shift gear is fixedly connected to the shift lever. Driving the shift lever can cause the shift gear to switch between the low-speed gear and the high-speed gear. When the shift gear is engaged with the low-speed gear, the first transmission gear drives the low-speed gear and outputs a first rotational speed to the output assembly through the third transmission gear; When the shift gear is engaged with the high-speed gear, the second transmission gear drives the high-speed gear and outputs a second rotation speed to the output assembly through the third transmission gear.

2. The gear shifting and speed reduction mechanism according to claim 1, characterized in that: The shift gear is sleeved on the shift shaft, and the low-speed gear and the high-speed gear are provided with internal teeth that cooperate with the shift gear. The shift lever can drive the shift gear to engage with the low-speed gear and the high-speed gear respectively to switch the output mode.

3. The gear shifting and speed reduction mechanism according to claim 2, characterized in that: It also includes a driving member, which is transmission-connected to the shift lever.

4. The gear shifting and speed reduction mechanism according to claim 3, characterized in that: The driving component is a motor.

5. The gear shifting and speed reduction mechanism according to claim 1, characterized in that: There are a plurality of driving gears, and the plurality of driving gears are meshed with the first transmission gear for transmission.

6. The gear shifting and speed reduction mechanism according to claim 5, characterized in that: There are two driving gears.

7. The gear shifting and speed reduction mechanism according to claim 1, characterized in that: The output assembly includes an output shaft and an output gear provided on the output shaft; The third transmission gear is engaged with the output gear, and the output gear is driven by the third transmission gear, so that the output shaft rotates.

8. The gear shifting and speed reduction mechanism according to claim 7, characterized in that: A connecting portion is provided at one end of the output shaft away from the output gear, and a traction member is provided through the connecting portion. The traction member can be wound around the output shaft and output traction force.

9. The gear shifting and speed reduction mechanism according to claim 8, characterized in that: The connecting portion includes a through hole provided on the output shaft, a pulley is provided in the through hole, and the traction member can be sleeved on the pulley through the through hole.

10. A fitness equipment, characterized in that: It includes the gear shifting and speed reduction mechanism as described in any one of claims 1 to 9.

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