Resistance transmission mechanism for fitness equipment

Abstract

The present invention proposes a resistance transmission mechanism for fitness equipment, including a resistance source, a planetary gearbox, a first winding assembly and a second winding assembly. The planetary gearbox adopts cylindrical gears, the planetary gearbox is arranged on the output shaft of the resistance source, the first winding assembly is fixed on the outer ring of the planetary gearbox, the second winding assembly is fixed on the planetary frame of the planetary gearbox, the first winding assembly and the second winding assembly can rotate independently, and have a corresponding reduction ratio relative to the input shaft. The mechanism provides resistance and tension (opposite to the direction of the external force). When the external force is greater than the force provided by the mechanism, the pull rope is pulled out, and when the external force is less than the force provided by the mechanism, the pull rope is pulled back. When the output shaft continuously outputs torque, the two winding assemblies can output torque at the same time, and have different reduction ratios and output torques. The diameter difference of the two winding assemblies is designed to compensate, so that the pull rope has equal or similar tension; the structure is compact and occupies a small volume, which is easy to install.

Description

Technical Field

[0001] The invention belongs to the technical field of fitness equipment, and in particular relates to a resistance transmission mechanism for fitness equipment. Background Art

[0002] With the improvement of people's living standards and the promotion of national fitness equipment, more and more people use fitness equipment to exercise. There are many types of fitness equipment on the market with different functions. New intelligent resistance training equipment is gradually entering the market. For double-handle resistance fitness equipment, a single motor and dual-outlet structure can be adopted to save costs. The usual solution is to provide resistance through a movable pulley group structure in conjunction with the motor, and use the movable pulley group to distribute the resistance from one pull rope to two pull ropes. This structure requires a large space for the movement of the movable pulley, so this method takes up a large space, is not easy to install in the fitness equipment, and it is difficult to achieve a large reduction ratio to amplify the pulling force of the motor.

[0003] Patent US10617903B2 discloses a differential mechanism of a fitness machine, which is equipped with two winding assemblies of the same diameter to output torque at the same time, but it is composed of bevel gears and sprockets and other components. The bevel gears are difficult to process and make a lot of noise. In addition, it requires synchronous belt transmission, which has many components and a complex structure, and the cost is quite high, and it is difficult to achieve a large reduction ratio. Summary of the invention

[0004] In order to solve the problems that the existing resistance transmission mechanism requires a large space, has high noise, has a small deceleration ratio and requires high cost, the present application provides a resistance transmission mechanism for fitness equipment to solve the technical defects of the existing resistance transmission mechanism.

[0005] The present invention proposes a resistance transmission mechanism for fitness equipment, including a resistance source, a planetary gearbox, a first winding assembly and a second winding assembly, wherein the planetary gearbox adopts a cylindrical gear, the planetary gearbox is arranged on the output shaft of the resistance source, the first winding assembly and the second winding assembly are arranged on the planetary gearbox, and the first winding assembly and the second winding assembly can both rotate independently.

[0006] Preferably, the resistance transmission mechanism further comprises a first pull rope and a second pull rope, wherein the first pull rope is wound around the first winding assembly and the second pull rope is wound around the second winding assembly. The cooperation between the pull rope and the winding assembly can satisfy the fitness person's need to exercise one arm or both arms.

[0007] Preferably, the planetary gearbox includes a sun gear, a planetary gear, a planetary carrier and an inner gear ring, the sun gear is fixedly connected to the output shaft of the resistance source, the planetary gear is meshed with the sun gear, the planetary carrier is rotatably covered outside the sun gear and the planetary gear, and the inner gear ring is rotatably sleeved on the planetary carrier and meshed with the planetary gear. Through the cooperation between the sun gear, the planetary gear, the planetary carrier and the inner gear ring, not only a differential effect can be achieved, but also torque can be increased, so the diameter of the winding assembly can be increased and the number of windings of the pull rope can be reduced.

[0008] Further preferably, the resistance transmission mechanism further includes an outer ring and a first bearing, the outer ring is fixedly connected to the inner gear ring, the first bearing is sleeved on the planet carrier and clamped to the inner side of the outer ring, and the first winding assembly is fixedly connected to the outer ring. The provision of the first bearing can constrain the outer ring to rotate only along the axis of the planet carrier and the output shaft, thereby ensuring the smooth operation of the planet carrier, and the sliding resistance and power consumption are relatively small, and the starting is easy.

[0009] Further preferably, the resistance transmission mechanism further includes a second bearing, which is sleeved on the output shaft and clamped on the inner side of the planet carrier, and the second winding assembly is fixed to the planet carrier. The second bearing is also provided to constrain the planet carrier to rotate only along the output shaft, and also has the effect of reducing the sliding resistance and power consumption, facilitating starting, and ensuring the smooth operation of the output shaft.

[0010] Further preferably, the resistance transmission mechanism also includes a needle roller shaft and a needle roller bearing, through holes are provided at both ends of the planetary frame, the needle roller shaft is inserted into the through holes, and the planetary gear is rotatably sleeved on the needle roller shaft through the needle roller bearing. By mounting the needle roller shaft on the through hole, when the sun gear rotates, the planetary gear can be driven to rotate, and the planetary gear drives the needle roller bearing to rotate, thereby driving the planetary frame to rotate, or when the planetary frame rotates, the needle roller shaft and the planetary frame rotate at the same time and drive the needle roller bearing to rotate, thereby driving the planetary gear to rotate, and finally driving the sun gear to rotate, that is, the revolution of the planetary frame and the planetary gear around the output shaft can transmit torque to each other and transmit rotation to each other.

[0011] Further preferably, openings are provided on both sides of the planet carrier for the planetary gears to mesh with the inner gear ring.

[0012] Further preferably, the sun gear, the planetary gears and the inner ring gear adopt involute helical gears. The use of involute helical gears not only has low cost and guaranteed precision, but also has low noise.

[0013] Further preferably, the resistance transmission mechanism further comprises a bearing end cover, which is sleeved on the end of the output shaft of the resistance source and abuts against the second bearing. The bearing end cover is provided to prevent the second bearing from falling off during the rotation of the resistance source.

[0014] Preferably, the resistance transmission mechanism further comprises a bracket, which is fixedly mounted on the resistance source and covers the outside of the first winding assembly and the second winding assembly. The resistance transmission mechanism can be quickly and conveniently fixedly mounted inside the fitness equipment through the bracket.

[0015] Compared with the prior art, the beneficial results of the present invention are:

[0016] (1) The present invention realizes the dual-rope output requirement that originally required two motors to achieve by combining one motor and one planetary gearbox, which greatly reduces the cost. In addition, compared with the solution of directly winding the pull rope around the output shafts of two motors, the resistance transmission mechanism provided by the present invention has greater output tension and torque;

[0017] (2) Compared with the movable pulley and rope differential structure solution, the resistance transmission mechanism provided by the present invention has higher reliability and more conveniently realizes the requirements of deceleration and torque increase;

[0018] (3) Compared with the bevel gear differential structure, the structure of the present invention is simpler and more compact, does not require synchronous belt and synchronous wheel transmission, and the processing cost of cylindrical gears is lower than that of sector gears, making it easier to achieve low noise;

[0019] (4) Compared with the movable pulley rope differential structure, the bevel gear differential structure and the dual-motor solution, the resistance transmission mechanism provided by the present invention only needs to occupy a smaller space to meet the resistance transmission requirements of a single motor and dual outputs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are included to provide a further understanding of the embodiments and are incorporated into and constitute a part of this specification. The accompanying drawings illustrate the embodiments and are used together with the description to explain the principles of the present invention. It will be easy to recognize other embodiments and many expected advantages of the embodiments because they become better understood by reference to the following detailed description. The elements of the drawings are not necessarily to scale with each other. The same reference numerals refer to corresponding similar parts.

[0021] Figure 1 is an exploded view of a resistance transmission mechanism according to a specific embodiment of the present invention;

[0022] Figure 2 is a cross-sectional view of a resistance transmission mechanism according to a specific embodiment of the present invention;

[0023] Figure 3 is an assembly diagram of a resistance transmission mechanism according to a specific embodiment of the present invention;

[0024] Figure 4 is an overall structural diagram of a resistance transmission mechanism according to a specific embodiment of the present invention;

[0025] Figure 5 It is an application schematic diagram of a resistance transmission mechanism according to a specific embodiment of the present invention.

[0026] The meaning of the numbers in the figure: 1-motor, 11-output shaft of the motor, 2-planetary gearbox, 21-sun gear, 22-planetary gear, 23-planet carrier, 231-opening, 232-through hole, 24-needle shaft, 25-inner gear ring, 26-needle bearing, 31-first winding assembly, 32-second winding assembly, 4-outer ring, 51-first bearing, 52-second bearing, 6-bearing end cover, 7-bracket, 81-first pull rope, 82-second pull rope, 9-fixed pulley, 10-rotating swing arm. DETAILED DESCRIPTION

[0027] In the following detailed description, reference is made to the accompanying drawings, which form a part of the detailed description and are shown by illustrative specific embodiments in which the present invention can be put into practice. To this end, directional terms, such as "top", "bottom", "left", "right", "up", "down", etc., are used with reference to the orientation of the figures described. Because the parts of the embodiments can be positioned in several different orientations, directional terms are used for the purpose of illustration and are by no means limiting. It should be understood that other embodiments may be utilized or logical changes may be made without departing from the scope of the present invention. Therefore, the following detailed description should not be adopted in a limiting sense, and the scope of the present invention is defined by the appended claims.

[0028] The present invention provides a resistance transmission mechanism for fitness equipment. Figure 1 shows an exploded view of a resistance transmission mechanism according to a specific embodiment of the present invention, Figure 2 A cross-sectional view of a resistance transmission mechanism according to a specific embodiment of the present invention is shown. Figure 3 FIG. 1 shows a schematic diagram of the assembly of a resistance transmission mechanism according to a specific embodiment of the present invention; Figure 1-3 The resistance transmission mechanism includes a resistance source, a planetary gearbox 2, a first winding assembly 31, a second winding assembly 32, an outer ring 4, a first bearing 51, and a second bearing 52, wherein the planetary gearbox 2 includes a sun gear 21, a planetary gear 22, a planetary carrier 23, a needle roller shaft 24, an inner gear ring 25, and a needle roller bearing 26. The resistance source specifically includes one or more of a motor 1, wind resistance, magnetic resistance, and water resistance. In this embodiment, the motor 1 is taken as an example.

[0029] The two second bearings 52 are sleeved on the output shaft 11 of the motor 1, and the two second bearings 52 are clamped on the inner side of the planetary carrier 23. The second bearings 52 can constrain the planetary carrier 23 to rotate only along the output shaft 11, which is easy to start, stable in rotation, and reduces the rotation resistance and power loss. The two first bearings 51 are sleeved on the planetary carrier 23, and the two first bearings 51 are clamped on the inner side of the outer ring 4. The first bearings 51 can constrain the outer ring 4 to rotate only along the axis of the planetary carrier 23 and the output shaft 11. Therefore, the output shaft 11, the planetary carrier 23 and the outer ring 4 can all rotate freely and smoothly along the output shaft 11 (including forward and reverse rotation).

[0030] The sun gear 21 is fixedly connected to the output shaft 11 and is located between the two second bearings 52. The sun gear 21 rotates simultaneously with the output shaft 11. The planetary gear 22 is sleeved on the needle shaft 24 via the needle bearing 26. The needle shaft 24 is inserted into the through hole 232 on the planetary carrier 23. Therefore, the planetary gear 22 can rotate along the needle shaft 24 or revolve along the output shaft 11. The revolving of the planetary carrier 23 and the planetary gear 22 can transfer torque to each other and drive each other to rotate. The sun gear 21 is meshed with the planetary gear 22. Therefore, the sun gear 21 and the planetary gear 22 can transfer torque to each other and drive each other to rotate. The inner gear ring 25 is fixedly connected to the inner side of the outer ring 4 and is located between the two first bearings 51. Therefore, the inner gear ring 25 can rotate simultaneously with the outer ring 4. Openings 231 are provided on both sides of the planet carrier 23, through which the inner ring gear 25 can mesh with the planetary gear 22, so that the rotation and revolution of the inner ring gear 25 and the planetary gear 22 transmit torque to each other and rotate with each other. Different from the traditional planetary reduction mechanism, the resistance source body (taking the motor 1 as an example), the output shaft 11, the planet carrier 23 and the inner ring gear 25 in the present application can rotate independently of each other. Preferably, the sun gear 21, the planetary gear 22 and the inner ring gear 25 use involute helical gears to reduce noise and ensure accuracy. The first winding assembly 31 is fixedly mounted on the outer ring 4 outside the planetary gear box 2 by bolts or bonding, and the second winding assembly 32 is fixedly mounted on the planetary carrier 23 of the planetary gear box 2 by bolts or bonding.

[0031] Continue to refer Figure 1 The resistance transmission mechanism further includes a bearing end cover 6 and a bracket 7, wherein the bearing end cover 6 is sleeved on the end of the output shaft 11 of the motor 1 and abuts against the second bearing 52 on the side away from the motor 1. The bearing end cover 6 is provided to prevent the second bearing 52 from falling off during the rotation of the motor 1 and affecting the operation of the resistance transmission mechanism. The bracket 7 is fixedly mounted on the motor 1 by bolts, and the resistance transmission mechanism can be quickly and conveniently fixedly mounted inside the fitness equipment by the bracket 7.

[0032] Figure 4FIG. 4 shows an overall structural diagram of a resistance transmission mechanism according to a specific embodiment of the present invention. Figure 4 The resistance transmission mechanism further includes a first pull rope 81 and a second pull rope 82, wherein the first pull rope 81 is wound on the first winding assembly 31, and the second pull rope 82 is wound on the second winding assembly 32. The motor 1 provides a continuous unidirectional torque, which is transmitted to the first winding assembly 31 and the second winding assembly 32 through the planetary gearbox 2, and then transmitted to the first pull rope 81 and the second pull rope 82 through the first winding assembly 31 and the second winding assembly 32, showing that the first pull rope 81 and the second pull rope 82 both have a continuous tension, and a tendency to be wound up by the first winding assembly 31 and the second winding assembly 32 respectively. Since the torque amplification multiples of the inner gear ring 25 and the planet carrier 23 relative to the output shaft 11 are different, the tension output by the first pull rope 81 and the second pull rope 82 can be equal or similar by designing the diameters of the first winding assembly 31 and the second winding assembly 32 to be different.

[0033] Continue to refer Figure 4 In a specific embodiment, the resistance transmission mechanism includes the following three motion states: when the outside world (including the fitness person and the rope limit position limiting structure) does not apply tension to the first rope 81 and the second rope 82, or the applied tension is less than the tension exhibited by the first rope 81 and the second rope 82, the first rope 81 and the second rope 82 are in a state of being wound around the first winding assembly 31 and the second winding assembly 32, respectively, and the first rope 81 and the second rope 82 continue to maintain a taut state and continue to output tension; when the outside world applies a force to the first rope 81 and the second rope 82 When the force exerted by the outside on the first pull rope 81 and the second pull rope 82 is equal to the tension exerted by the first pull rope 81 and the second pull rope 82, the first pull rope 81 and the second pull rope 82 are in a state of being pulled away from the first winding assembly 31 and the second winding assembly 32 respectively, and the pull ropes continue to remain in a taut state and continue to output tension; when the force applied by the outside to the first pull rope 81 and the second pull rope 82 is equal to the tension exerted by the first pull rope 81 and the second pull rope 82, the first pull rope 81, the second pull rope 82, the first winding assembly 31 and the second winding assembly 32 are all in a stationary state, and at this time, the pull ropes also continue to remain in a taut state and continue to output tension.

[0034] Combined with reference Figure 2 , Figure 3 and Figure 4The working principle of the resistance transmission mechanism is as follows: the output shaft 11 of the motor 1 continuously outputs torque and transmits it to the sun gear 21, the sun gear 21 transmits the torque to the planetary gear 22, and the planetary gear 22 transmits the torque to the inner ring gear 25. And under the interaction between the inner ring gear 25 and the sun gear 21, the planetary gear 22 will show a tendency to revolve along the output shaft 11 and torque, and the torque is transmitted to the planetary carrier 23 through the needle bearing 26 and the needle shaft 24. Therefore, the inner ring gear 25 and the planetary carrier 23 simultaneously output torque under the interaction inside the planetary gear box 2, and the torque can be several times the torque of the output shaft 11 after deceleration and amplification. The torque is transmitted to the first pull rope 81 and the second pull rope 82 through the first winding assembly 31 and the second winding assembly 32, respectively, so that the first pull rope 81 and the second pull rope 82 generate tension. However, the reduction ratios of the inner gear ring 25 and the planet carrier 23 relative to the output shaft 11 are different, so the output torques are also different. By reasonably designing the different diameters of the first winding assembly 31 and the second winding assembly 32, the first pull rope 81 and the second pull rope 82 can exhibit the same or similar tension. The first winding assembly 31 and the second winding assembly 32 can rotate separately, can rotate simultaneously, or can rotate one forward and the other reverse at the same time. That is, through the resistance transmission mechanism, the fitness person can feel the tension output by the first pull rope 81 and the second pull rope 82 when the first pull rope 81 and the second pull rope 82 are in any combination of being pulled out, contracted or stationary, so as to meet the fitness person's use needs of exercising both arms or only exercising one arm.

[0035] Compared with the traditional tension fitness equipment using counterweights, the fitness equipment using the resistance transmission mechanism proposed by the present invention, i.e., using a resistance source such as a motor to generate resistance, is smaller in size and lighter in weight, and can be installed in more places, such as homes, offices, leisure places, etc., and the resistance can also be adjusted by a digital control system. The "weight movement" of the traditional counterweight fitness equipment is converted into motor rotation. Since the circumference and rotation speed of the first winding assembly 31 and the second winding assembly 32 are known, the linear movement of the first pull rope 81 and the second pull rope 82 can be calculated to provide an effect equivalent to the linear movement of the counterweight.

[0036] Figure 5 FIG. 4 shows an application schematic diagram of a resistance transmission mechanism according to a specific embodiment of the present invention. Figure 5As shown, in a specific embodiment, the first pull rope 81 wound on the first winding assembly 31 of the resistance transmission mechanism and the second pull rope 82 wound on the second winding assembly 32 are respectively passed around the fixed pulley 9 and fixedly connected to the rotating swing arm 10. The resistance transmission mechanism can directly lead out two pull ropes. Compared with the traditional mechanism in which a motor and a pulley group cooperate to provide resistance, the structure is more compact, a large number of pulleys can be saved, and the occupied volume is also small. It can be conveniently and quickly installed inside the fitness equipment through the bracket 7. Moreover, since the present invention has the function of reducing speed and increasing torque, the winding assembly can adopt a larger diameter, so that the resistance transmission mechanism provided by the present application can store and wind a large number of pull ropes. The larger the diameter of the first winding assembly 31 and the second winding assembly 32 or the thinner the first pull rope 81 and the second pull rope 82, the longer the pull rope can be stored to meet the fitness people's higher intensity training.

[0037] Obviously, those skilled in the art can make various modifications and changes to the embodiments of the present invention without departing from the spirit and scope of the present invention. In this way, if these modifications and changes are within the scope of the claims of the present invention and their equivalents, the present invention is also intended to cover these modifications and changes. The word "comprising" does not exclude the presence of other elements or steps not listed in the claims. The simple fact that certain measures are recorded in mutually different dependent claims does not indicate that the combination of these measures cannot be used to profit. Any reference numerals in the claims should not be considered to limit the scope.

Claims

1. A resistance transmission mechanism for fitness equipment, characterized in that: The invention comprises a resistance source, a planetary gearbox, a first winding assembly and a second winding assembly, wherein the planetary gearbox adopts a cylindrical gear, the planetary gearbox is arranged on a rotatable output shaft of the resistance source, the first winding assembly and the second winding assembly are arranged on the planetary gearbox, and the first winding assembly and the second winding assembly can rotate independently. The device further comprises a first pull rope and a second pull rope, wherein the first pull rope is wound around the first winding assembly, and the second pull rope is wound around the second winding assembly. The resistance output from the rotatable output shaft of the resistance source is transmitted to the first pull rope and the second pull rope through the first winding assembly and the second winding assembly, respectively, so that the first pull rope and the second pull rope both have continuous tension. The planetary gearbox comprises a sun gear, planetary gears, a planetary carrier and an inner gear ring, wherein the sun gear is fixedly connected to the output shaft of the resistance source and rotates together with the output shaft when the output shaft rotates, the planetary gears are meshed with the sun gear, the planetary carrier is rotatably covered outside the sun gear and the planetary gears, and the inner gear ring is rotatably sleeved on the planetary carrier and meshed with the planetary gears. It also includes an outer ring, the inner gear ring is fixedly connected to the inner side of the outer ring and can rotate simultaneously with the outer ring, the first winding assembly is fixedly connected to the outer ring, and the second winding assembly is fixedly connected to the planet carrier.

2. The resistance transmission mechanism for fitness equipment according to claim 1, characterized in that: It also includes a first bearing, which is sleeved on the planet carrier and clamped on the inner side of the outer ring.

3. The resistance transmission mechanism for fitness equipment according to claim 1, characterized in that: It also includes a second bearing, which is sleeved on the output shaft and clamped on the inner side of the planet carrier.

4. The resistance transmission mechanism for fitness equipment according to claim 1, characterized in that: It also includes a needle roller shaft and a needle roller bearing. Through holes are opened at both ends of the planetary frame. The needle roller shaft is inserted into the through holes. The planetary gear is rotatably sleeved on the needle roller shaft through the needle roller bearing.

5. The resistance transmission mechanism for fitness equipment according to claim 1, characterized in that: Openings are provided on both sides of the planet carrier for the planetary gears to mesh with the inner gear ring.

6. The resistance transmission mechanism for fitness equipment according to claim 1, characterized in that: The sun gear, the planetary gears and the inner ring gear are involute helical gears.

7. The resistance transmission mechanism for fitness equipment according to claim 3, characterized in that: It also includes a bearing end cover, which is sleeved on the end of the output shaft of the resistance source and abuts against the second bearing.

8. The resistance transmission mechanism for fitness equipment according to claim 1, characterized in that: It also includes a bracket, which is fixedly installed on the resistance source and covers the outside of the first winding assembly and the second winding assembly.

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