Differential mechanism for body-building chest expander

Abstract

The utility model relates to the field of fitness equipment, in particular to a differential mechanism for a fitness chest expander. A differential mechanism for a body-building chest expander comprises two rotating shafts and a rotating disc, a first bevel gear is rotationally fixed to the rotating disc, the rotating shafts are rotationally fixed to a fixing part, second bevel gears are arranged on the rotating shafts, wire coils are further fixed to the rotating shafts, and the first bevel gear and the second bevel gear are arranged on the rotating shafts. The parts, deviating from the left side and the right side, of the fixing part are provided with passing openings allowing the output end of the driving motor to stretch in, the fixing part comprises a left fixing part and a right fixing part, the left fixing part and the right fixing part are spliced and fixed to form a containing cavity, the wire coil is located on the outer side of the fixing part, and the rotating disc is rotationally fixed to the rotating shaft through a first bearing; the two rotating shafts are rotationally fixed to the left fixing part and the right fixing part through second bearings correspondingly. The utility model has the advantages that the assembly is convenient, the effective meshing with the output end of the driving motor can be ensured, and the occupied space in the transverse direction is smaller.

Description

Technical Field

[0001] The utility model relates to the field of fitness equipment, in particular to a differential mechanism for a fitness puller. Background Art

[0002] Existing fitness pullers, such as fitness mirrors, include a housing for placing a controller and a rope puller. The rope is pulled out from both sides of the housing. The portion of the rope located inside the housing is wound on a reel, and the reel is linked to a motor.

[0003] A Chinese patent with application number 202310373690.4 discloses two differential mechanisms for fitness pullers. The scheme can distribute the power of the power part to the two cable drum assemblies through the differential mechanism, and can distribute the corresponding rotation speed through the differential mechanism. Only one motor can provide training resistance for the two lever arms, thereby reducing the number of motors used, and further reducing the manufacturing cost of the fitness puller.

[0004] In the above-mentioned patent solution, the rotating shaft and the motor of the first differential mechanism are coaxially arranged at the same height, resulting in a larger overall width, which is not suitable for fitness pullers with smaller widths; the second differential mechanism reduces the overall lateral width by arranging the drive motor above or below the rotating shaft, but its differential mechanism is not easy to assemble.

[0005] The rotating shaft of the second differential mechanism needs to be fixed to the fixed part, the planetary bracket needs to be fixed on the rotating shaft through the flange structure, the bearing and the wire drum need to be pressed on the rotating shaft, and the axial position of the planetary bracket needs to be adjusted to ensure engagement with the output end of the drive motor. Since the distance between the left and right side walls of the fixed part is certain, even if the rotating shaft is composed of two rotating shaft monomers, and the two rotating shaft monomers are respectively fixed on the left and right sides of the turntable, the rotating shaft is difficult to assemble, and it is difficult to ensure that the ring gear on the planetary bracket can effectively engage with the output end of the drive motor. Utility Model Content

[0006] The utility model aims to provide a differential mechanism for a fitness puller which is easy to assemble, can ensure effective engagement with the output end of a driving motor and occupies a small space in the lateral direction.

[0007] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a differential mechanism for a fitness puller, comprising two coaxial rotating shafts and a turntable for receiving the torque output by a driving motor, a plurality of first bevel gears are rotatably fixed on the turntable, the rotating shafts are all rotatably fixed to a fixed part, the rotating shafts are all provided with second bevel gears for meshing with the first bevel gears, and a wire drum is also fixed on the rotating shaft, a portion of the fixed part deviating from the left and right sides is provided with a through opening for the output end of the driving motor to extend into, the fixed part comprises a left fixed part and a right fixed part, the left fixed part and the right fixed part are spliced ​​and fixed to form an accommodating cavity for accommodating the rotating disk, the first bevel gear and the second bevel gear, the wire drum is located outside the fixed part, the left fixed part and the right fixed part are both provided with a through hole for the end of a rotating shaft to pass through, the turntable is rotatably fixed to the rotating shaft through a first bearing, and the two rotating shafts are rotatably fixed to the left fixed part and the right fixed part respectively through a second bearing.

[0008] When it is necessary to assemble the differential mechanism of the utility model, the rotating shaft and the second bevel gear are assembled first, and then the second bearing, the rotating shaft with the gear fixed thereon and the left and right fixed parts are press-fitted, so that the rotating shaft passes through the left and right fixed parts and extends out of the fixed parts, and then the first bearing and the turntable with the first bevel gear fixed thereon are installed on the inner end of a rotating shaft, and then the drive motor is assembled, and the drive motor is installed on the left fixed part or the right fixed part with the turntable, so that the output end of the drive motor extends into the left fixed part or the right fixed part, and finally the left fixed part and the right fixed part are fixed with fasteners, wherein, since the axial position between the components is good, the adaptive rotation of the rotating shaft with the second bevel gear or the first bevel gear is achieved through the contact pressure during press-fitting, thereby achieving effective meshing.

[0009] The differential mechanism of the utility model is used to fix the driving motor and the fixed part of the rotating shaft. The two rotating shafts can be fixed to one part respectively, and then the turntable is fixed on the end of the rotating shaft located on the inner side of the fixed part, and finally the left and right parts of the fixed part are spliced, so as to realize modular assembly, which is convenient for assembly line operation and each individual assembly process. In the assembly process of the utility model, as long as the press-fitting position between the rotating shaft, the bearing and the fixed part can be guaranteed, the position between the ring gear at the turntable and the output end of the driving motor and the position between the first bevel gear and the second bevel gear can be guaranteed. Only a small rotation of the rotating shaft or the turntable is required to ensure effective meshing.

[0010] The assembly of the wire drum and the rotating shaft can be performed after the assembly of the rotating shaft, the second bearing and the left and right fixing parts are completed, or the assembly of the wire drum and the rotating shaft can be performed after the assembly of the left and right fixing parts are completed.

[0011] The utility model provides a through opening on the fixing part so that the driving motor can be located at the front and rear sides or the upper and lower sides of the fixing part, thereby ensuring that the left and right width of the differential mechanism for the entire fitness puller is small, so that it can be suitable for fitness pullers such as fitness mirrors with small widths. The fixing part of the utility model constitutes a right accommodating chamber, and the entire fixing part is in a box shape. It only needs to adopt the sealing method of a conventional motor or a reduction box (an oil seal is provided at the second bearing, and a sealing ring is provided at the joint of the left fixing part and the right fixing part) to ensure the sealing of the accommodating chamber, avoid the loss of lubricating oil in the accommodating chamber, and avoid foreign matter from entering the accommodating chamber, thereby ensuring the normal use of the fitness puller of the utility model, and the user can pull the rope of the fitness puller more smoothly, and there will be no jamming due to the internal corrosion of the differential mechanism.

[0012] Preferably, the second bevel gear is integrally arranged with the rotating shaft. By integrally arranging the second bevel gear with the rotating shaft, the assembly steps can be reduced, and the thickness of the connection between the second bevel gear and the rotating shaft can be reduced, further reducing the space required for the accommodating cavity and making the volume of the fixing part smaller.

[0013] Preferably, the fixing portion has two side walls on opposite sides of the through hole, each of which is formed with a bearing chamber, the second bearing is located in the bearing chamber, and each second bearing is limited between the axial surface of the bearing chamber and the axial surface of the second bevel gear. The second bearing is axially limited by the second bevel gear integrally formed on the rotating shaft, and there is no need to use a shaft retaining ring or other components for limiting, which can reduce the number of parts to be assembled.

[0014] Preferably, the circumferential outer wall of the turntable is matched with the inner wall of the fixing part which deviates from the inner wall of the through hole. The above arrangement makes the inner wall of the accommodating cavity closer to the circumferential outer wall of the turntable, which can ensure the use effect of the lubricating oil, facilitate the installation of the turntable, and facilitate the alignment of the turntable with the rotating shaft, or the alignment of the rotating shaft equipped with the turntable with the fixing part.

[0015] Preferably, the portion of the rotating shaft outside the fixed part includes a thick section and a thin section, the thick section is closer to the fixed part than the thin section, a wire drum is provided on the outer shell of the thin section, and the outer wall of the thin section and the inner wall of the wire drum are provided with mutually matching positioning protrusions and positioning grooves, the positioning protrusions and positioning grooves are extended along the axial direction of the rotating shaft, and the axial surface of the wire drum is close to the axial surface of the thick section. The above arrangement can make the linkage assembly between the rotating shaft and the wire drum more convenient. Among them, a shaft retaining ring can be provided to limit the axial movement of the wire drum.

[0016] Preferably, the first bearing is a sliding bearing, which is sleeved outside the ends of the two rotating shafts. The sliding bearing is thinner than a general rolling bearing, which can make the diameter of the turntable smaller and make the turntable rotate more smoothly.

[0017] The utility model has the advantages of being easy to assemble, being able to ensure effective engagement with the output end of the driving motor, and occupying a small space in the lateral direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model.

[0019] Figure 2 It is a cross-sectional view of the utility model.

[0020] Figure 3 It is a structural schematic diagram of the rotating shaft of the utility model. DETAILED DESCRIPTION

[0021] The utility model is further described below based on the accompanying drawings and specific embodiments.

[0022] Depend on Figure 1 and Figure 2 As shown, this embodiment discloses a differential mechanism for a fitness puller, comprising a fixed part 1, two rotating shafts 2 and a driving motor 3, wherein the driving motor 3 is fixed on the upper side of the fixed part 1, and the output end of the driving motor 3 extends into the accommodating cavity formed by the fixed part 1, the two rotating shafts 1 are coaxially arranged, and through holes for the ends of the rotating shafts 2 to pass through are provided on both sides of the fixed part 1, and a wire drum 20 is fixedly sleeved on the portion of the rotating shaft 2 located outside the fixed part 1.

[0023] The fixing part 1 of this embodiment includes a left fixing part 11 and a right fixing part 12. The left fixing part 11 is in the shape of a box, and the right fixing part 12 is in the shape of a box cover. Both the left fixing part 11 and the right fixing part 12 are provided with a through hole. Both the left fixing part 11 and the right fixing part 12 are formed with a bearing chamber for accommodating a second bearing 22. The through hole is connected with the bearing chamber. The two rotating shafts 2 are respectively rotatably fixed to the left and right fixing parts through a second bearing 22. Among them, the upper end of the left fixing part 11 is formed with a through opening that opens upwards for the output end of the driving motor 3 to extend into. The output end is the lower end of the rotating shaft of the driving motor, and the rotating shaft of the driving motor is arranged vertically. Among them, the structural position of the gear ring of the turntable 4 and the output end style of the drive motor can be selected according to actual needs. The output end of the drive motor in this embodiment is a bevel gear to mesh with the gear ring at the axial surface of the turntable. It can also be set as a vertical worm according to actual needs to mesh with the gear ring at the circumferential outer wall of the turntable. A through hole can also be opened on the side wall of the upper end of the fixing part so that the output shaft of the drive motor can be extended horizontally into the accommodating cavity to mesh with the gear ring on the turntable.

[0024] The left fixed portion 11 and the right fixed portion 12 are assembled and fixed to form an accommodating cavity for accommodating the turntable 4, the first bevel gear 41 and the second bevel gear 32. Four first bevel gears 41 are rotatably fixed on the turntable 4. The four first bevel gears 41 are evenly distributed on the turntable 4. Second bevel gears 21 for meshing with the first bevel gears 41 are integrally formed on the two rotating shafts 2. Each second bearing 22 is confined between the axial surface of the bearing chamber and the axial surface of the second bevel gear shaft 21.

[0025] The turntable 4 is fixed to the rotating shaft 2 through the first bearing 42, which is a sliding bearing. The first bearing 42 is sleeved and fixed outside the ends of the two rotating shafts 2. The circumferential outer wall of the turntable 4 is clearance-matched with the front and rear inner walls and the lower inner wall of the left fixing part 11. A step surface can be formed on the inner end of the rotating shaft 2 to limit the axial movement of the first bearing 42, or a shaft retaining ring can be provided to limit the axial movement of the first bearing 42.

[0026] Depend on Figure 3 As shown, the portion of the rotating shaft 2 located outside the fixed portion 1 includes a thick section 201 and a thin section 202. The thick section 201 is closer to the fixed portion than the thin section 202. The thin section 202 is enclosed by the fixed wire drum 20. The outer wall of the thin section 202 and the inner wall of the wire drum 20 are provided with mutually matching positioning protrusions 200 and positioning grooves. Both the positioning protrusions 200 and the positioning grooves extend along the rotating shaft axis 2. Figure 2 As shown, the axial surface of the wire drum 20 and the axial surface of the thick section 201 are close to each other, and the wire drum 20 can be tightly fitted on the rotating shaft 2, or the axial movement of the wire drum 20 along the rotating shaft can be restricted by setting a shaft retaining ring.

[0027] During production and assembly of the differential mechanism of this embodiment, different workers can press-fit a rotating shaft and a left fixed part or a right fixed part respectively, and then assemble the left and right fixed parts equipped with the rotating shafts with the turntable and the drive motor in turn, and finally assemble the two wire drums with the two rotating shafts.

[0028] This embodiment has the advantages of being easy to assemble, being able to ensure effective engagement with the output end of the drive motor, and occupying a small space in the lateral direction.

Claims

1. A differential mechanism for a fitness puller, comprising two coaxial rotating shafts and a turntable for receiving the torque output by a driving motor, a plurality of first bevel gears are rotatably fixed on the turntable, the rotating shafts are all rotatably fixed to a fixed portion, the rotating shafts are all provided with second bevel gears for meshing with the first bevel gears, and a wire drum is also fixed on the rotating shaft, characterized in that: A through hole for the output end of the driving motor to extend into is provided at a portion of the fixing portion deviating from the left and right sides, and the fixing portion includes a left fixing portion and a right fixing portion, and the left fixing portion and the right fixing portion are spliced ​​and fixed to form an accommodating cavity for accommodating the turntable, the first bevel gear and the second bevel gear, and the wire drum is located outside the fixing portion, and the left fixing portion and the right fixing portion are both provided with a through hole for the end of a rotating shaft to pass through, and the turntable is rotatably fixed to the rotating shaft through a first bearing, and the two rotating shafts are rotatably fixed to the left fixing portion and the right fixing portion respectively through a second bearing.

2. The differential mechanism for a fitness puller according to claim 1, characterized in that: The second bevel gear is integrally arranged with the rotating shaft.

3. The differential mechanism for a fitness puller according to claim 1 or 2, characterized in that: The fixing portion has side walls on opposite sides of the through hole, both of which form bearing chambers. The second bearing is located in the bearing chamber, and each second bearing is confined between the axial surface of the bearing chamber and the axial surface of the second bevel gear.

4. The differential mechanism for a fitness puller according to claim 1, characterized in that: The circumferential outer wall of the rotating disk is loosely matched with the inner wall of the fixing portion which deviates from the inner wall of the through opening.

5. The differential mechanism for a fitness puller according to claim 1, characterized in that: The portion of the rotating shaft located outside the fixed portion includes a thick section and a thin section, the thick section is closer to the fixed portion than the thin section, a wire drum is arranged outside the thin section, and the outer wall of the thin section and the inner wall of the wire drum are provided with mutually matching positioning protrusions and positioning grooves, the positioning protrusions and positioning grooves both extend axially along the rotating shaft, and the axial surface of the wire drum and the axial surface of the thick section are close to each other.

6. The differential mechanism for a fitness puller according to claim 1, characterized in that: The first bearing is a sliding bearing, and the first bearing sleeve is arranged outside the ends of the two rotating shafts.

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