CN221332641U - Dumbbell weight adjusting rod - Google Patents

Abstract

The utility model relates to a dumbbell weight adjusting rod, which comprises a rod shell, a rod assembly, a gear assembly and a transmission assembly. The rod assembly penetrates through the rod shell and comprises a first rod body and a second rod body which are buckled with each other, a first rack is arranged on the first rod body, and a second rack is arranged on the second rod body. The gear assembly is arranged in the rod shell and between the first rack and the second rack, the gear assembly comprises transmission gears and reversing gears which are meshed, at least two transmission gears are arranged side by side at intervals, reversing gears are arranged between every two adjacent transmission gears, the transmission gears are identical in steering direction through the reversing gears, the diameter of each transmission gear is larger than that of each reversing gear, and the transmission gears are meshed with the first rack and the second rack. The transmission assembly is arranged in the rod shell and is connected with the rod shell and the gear assembly in a transmission manner, so that the first rod body and the second rod body can be driven to stretch and retract when the rod shell rotates.

Description

Dumbbell weight adjusting rod

Technical Field

The utility model relates to the field of fitness equipment, in particular to a dumbbell weight adjusting rod.

Background

The dumbbell is divided into two kinds, and one kind is dumbbell pole and dumbbell piece integrated into one piece setting, and its weight is unadjustable, and along with the demand of user to strength improves gradually, corresponding needs purchase the dumbbell of many different weights, and is with high costs, occupation space is big, and another kind is dumbbell pole and dumbbell piece pass through the bolt and dismantle the connection, disposes the dumbbell piece of corresponding quantity at the both ends of holding rod according to actual demand, needs to adjust the length of dumbbell pole simultaneously, and the operation is comparatively troublesome.

In order to facilitate the weight adjustment of the dumbbell, the Chinese patent with the bulletin number of CN205127273U provides an adjustable dumbbell counterweight adjusting rod, which comprises a dumbbell rod and connectors arranged at two ends of the dumbbell rod, wherein a cross rod for hanging a counterweight disc is arranged in the dumbbell rod, the cross rod is mainly formed by buckling two semicircular connecting rods, a groove is arranged at the length of nearly 1/3 of the connecting rod, a rack is arranged at the length of 2/3 of the connecting rod, a pin shaft is inserted into the groove on the two connecting rods, gear discs are arranged on the two connectors, and the two gear discs are respectively connected with the racks on the two connecting rods in a transmission manner. Therefore, when the dumbbell rod rotates, the two connecting rods can be driven to stretch out and draw back respectively through the two connectors, the stretching length of the connecting rods is adjusted, the number of dumbbell pieces hung on the connecting rods is adjusted, and the pin shafts can effectively reduce shaking when the connecting rods stretch out. However, due to the arrangement of the grooves, the length of the rack is limited, so that the stroke of the connecting rod is short, and the adjustable weight is limited. In addition, each connecting rod is driven by the meshing of a single gear disc and a rack, and the expansion and contraction of the connecting rod are not stable enough.

Disclosure of utility model

The utility model aims to provide a dumbbell weight adjusting rod so as to solve the problems in the prior art.

In order to solve the technical problems, the utility model adopts the following technical scheme.

The utility model provides a dumbbell weight adjusting lever, which comprises: a lever housing; the rod assembly is arranged in the rod shell in a penetrating mode and comprises a first rod body and a second rod body which are buckled with each other, a first rack is arranged on the first rod body, and a second rack is arranged on the second rod body; the gear assembly is arranged in the rod shell and between the first rack and the second rack, the gear assembly comprises transmission gears and reversing gears which are meshed with each other, at least two transmission gears are arranged side by side at intervals, the reversing gears are arranged between every two adjacent transmission gears, the transmission gears are identical in steering through the reversing gears, the diameter of each transmission gear is larger than that of the reversing gear, and the transmission gears are meshed with the first rack and the second rack; the transmission assembly is arranged in the rod shell and is in transmission connection with the rod shell and the gear assembly, so that the first rod body and the second rod body can be driven to stretch and retract when the rod shell rotates.

According to some embodiments of the application, the transmission assembly comprises a gear ring and a drive gear which are meshed; the gear ring is fixedly connected to the rod shell; the driving gear is fixedly connected to the transmission gear and can coaxially rotate with the transmission gear; or, the driving gear is fixedly connected to the reversing gear and can coaxially rotate with the reversing gear.

In some embodiments of the application, the first rack and the second rack each extend in an axial direction of the lever housing; the transmission gear and the reversing gear are arranged side by side at intervals along the axial direction of the rod shell; the transmission gear and the reversing gear are straight gears, and the rotation axis of the transmission gear and the rotation axis of the reversing gear are located in the radial direction of the rod shell; the driving gear is a bevel gear, and the rotation axes of the driving gear are all positioned in the radial direction of the rod shell; the gear ring is a bevel gear, and the rotation axes of the gear ring are all positioned in the axial direction of the rod shell.

According to some embodiments of the application, the gear ring and the driving gear are located at the axial middle of the lever housing; the gear assembly is symmetrically disposed with respect to the axial middle of the lever housing.

According to some embodiments of the application, two symmetrically arranged rows of assembly holes are arranged on two sides of the rod shell; the assembly hole row comprises a first assembly hole and a second assembly hole; at least two first assembly holes are arranged side by side at intervals, and the second assembly holes are arranged between every two adjacent first assembly holes; the gear assembly further comprises a first assembly shaft fixedly connected to the transmission gear shaft line and a second assembly shaft fixedly connected to the reversing gear shaft line; the two ends of the first assembly shaft are respectively rotatably arranged in two symmetrical first assembly holes in two rows of assembly hole rows in a penetrating manner; the two ends of the second assembly shaft are respectively rotatably arranged in two symmetrical second assembly holes in two rows of assembly hole rows in a penetrating mode.

According to some embodiments of the application, the lever housing comprises an outer housing and a lever barrel fixedly connected in the outer housing; the assembly holes are arranged on the pole barrel; the rod assembly is arranged in the rod barrel in a penetrating way; the transmission gear and the reversing gear are both arranged in the pole barrel, and the transmission assembly is arranged between the outer shell and the pole barrel; one of the first assembly shafts or one of the second assembly shafts extends out between the outer shell and the rod barrel and is connected with the transmission assembly.

According to some embodiments of the application, the stem comprises a first portion and a second portion that snap-fit together; the first assembly holes are formed by encircling two first semicircular holes which are respectively arranged on the first part and the second part; the second assembly holes are formed by encircling two second semicircular holes which are respectively arranged on the first part and the second part.

According to some embodiments of the application, the first assembly shafts are respectively rotatably arranged at two ends in the two first assembly holes in a penetrating manner, and shaft shoulders are arranged at two ends of each first assembly shaft; the second assembly shafts are respectively rotatably arranged at two ends in the second assembly holes in a penetrating mode, and shaft shoulders are arranged at two ends in the second assembly holes.

According to some embodiments of the application, the first rod body comprises two first reinforcing strips and a first connecting strip connected between the two first reinforcing strips; a first mounting groove is formed between the two first reinforcing strips at intervals; a first rack is arranged on the first connecting strip and is positioned on the bottom surface of the first mounting groove; the second rod body comprises two second reinforcing strips and a second connecting strip connected between the two second reinforcing strips; a second mounting groove is formed between the two second reinforcing strips at intervals; a second rack is arranged on the second connecting bar and is positioned on the bottom surface of the second mounting groove; the transmission gear and the reversing gear extend into the first mounting groove and the second mounting groove.

In some embodiments of the application, the first rod further includes a first mounting shaft at one end; the two first reinforcing strips and the first connecting strip are connected to the first mounting shaft; the second rod body further comprises a second installation shaft positioned at one end; the two second reinforcing strips and the second connecting strip are connected to the second mounting shaft.

As can be seen from the technical scheme, the embodiment of the utility model has at least the following advantages and positive effects:

In the dumbbell weight adjusting rod provided by the embodiment of the utility model, the first rod body and the second rod body are not required to be provided with the groove structures, the first rack can extend from one end of the first rod body to the other end of the first rod body, and the second rack can extend from one end of the second rod body to the other end of the second rod body, so that the first rack and the second rack can have longer meshing length with the transmission gear, the telescopic stroke of the first rod body and the second rod body is improved, the number of dumbbell pieces which can be hung on the first rod body and the second rod body is more, and the weight adjusting range is wider.

And can utilize at least two drive gears to provide the drive force to the first body of rod and the second body of rod, compare in single drive gear and single rack meshing provide the condition of drive force, can make the flexible of the first body of rod and the second body of rod more stable.

Drawings

Various objects, features and advantages of the present utility model will become more apparent from the following detailed description of the preferred embodiments of the utility model, when taken in conjunction with the accompanying drawings. The drawings are merely exemplary illustrations of the utility model and are not necessarily drawn to scale. In the drawings, like reference numerals refer to the same or similar parts throughout. Wherein:

FIG. 1 is a perspective view of a dumbbell weight adjustment lever according to one embodiment of this utility model.

Fig. 2 is a cross-sectional view of fig. 1.

Fig. 3 is a side perspective view of fig. 1.

Fig. 4 is a perspective view of fig. 1 with the outer housing and drive gear removed.

Fig. 5 is an exploded perspective view of fig. 4.

Fig. 6 is a perspective view of the first rod (second rod) of fig. 5.

The reference numerals are explained as follows: 1. a lever housing; 11. an outer housing; 12. a pole barrel; 121. a first portion; 122. a second portion; 2. a lever assembly; 21. a first rod body; 211. a first reinforcing bar; 212. a first connecting bar; 2121. a first rack; 213. a first mounting shaft; 22. a second rod body; 221. a second reinforcing bar; 222. a second connecting bar; 2221. a second rack; 223. a second mounting shaft; 3. a gear assembly; 31. a transmission gear; 32. a reversing gear; 33. a first assembly shaft; 34. a second assembly shaft; 4. a transmission assembly; 41. a gear ring; 42. and a drive gear.

Detailed Description

While this utility model is susceptible of embodiment in different forms, there is shown in the drawings and will herein be described in detail, specific embodiments thereof with the understanding that the present disclosure is to be considered as an exemplification of the principles of the utility model and is not intended to limit the utility model to that as illustrated.

Thus, rather than implying that each embodiment of the present utility model must have the characteristics described, one of the characteristics indicated in this specification will be used to describe one embodiment of the present utility model. Furthermore, it should be noted that the present specification describes a number of features. Although certain features may be combined together to illustrate a possible system design, such features may be used in other combinations not explicitly described. Thus, unless otherwise indicated, the illustrated combinations are not intended to be limiting.

In the embodiments shown in the drawings, indications of orientation (such as up, down, left, right, front and rear) are used to explain the structure and movement of the various elements of the utility model are not absolute but relative. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the description of the position of these elements changes, the indication of these directions changes accordingly.

Referring to fig. 1 to 3, a dumbbell weight adjusting lever according to an embodiment of the present utility model includes a lever housing 1, a lever assembly 2, a gear assembly 3, and a transmission assembly 4.

The rod assembly 2 is arranged in the rod shell 1 in a penetrating mode, the rod assembly 2 comprises a first rod body 21 and a second rod body 22 which are buckled with each other, a first rack 2121 is arranged on the first rod body 21, and a second rack 2221 is arranged on the second rod body 22.

The gear assembly 3 is disposed in the lever housing 1 and between the first rack 2121 and the second rack 2221, the gear assembly 3 includes a transmission gear 31 and a reversing gear 32 that are engaged with each other, at least two transmission gears 31 are disposed side by side at intervals, the reversing gears 32 are disposed between every two adjacent transmission gears 31, the steering directions of the transmission gears 31 are the same through the reversing gears 32, the diameter of the transmission gears 31 is larger than the diameter of the reversing gears 32, and the transmission gears 31 are engaged with the first rack 2121 and the second rack 2221.

The transmission assembly 4 is arranged in the rod shell 1 and is in transmission connection with the rod shell 1 and the gear assembly 3, so that the first rod body 21 and the second rod body 22 can be driven to stretch and retract when the rod shell 1 rotates.

Through the above design, the first body of rod 21 and the second body of rod 22 all need not to set up groove structure, and first rack 2121 can extend to the other end of the first body of rod 21 by the one end of the first body of rod 21, and second rack 2221 can extend to the other end of the second body of rod 22 by the one end of the second body of rod 22 for first rack 2121 and second rack 2221 all can have longer meshing length with drive gear 31, have improved the flexible stroke of the first body of rod 21 and the second body of rod 22, and the quantity of dumbbell piece that first body of rod 21 and second body of rod 22 can be articulated is more, and weight adjusting range is wider.

In addition, at least two transmission gears 31 can be used for providing driving force for the first rod body 21 and the second rod body 22, and compared with the condition that a single transmission gear 31 is meshed with a single rack to provide driving force, the telescopic motion of the first rod body 21 and the second rod body 22 can be more stable. Specifically, when the rod casing 1 rotates, at least two transmission gears 31 are rotated in the same direction through the transmission assembly 4, and the transmission gears 31 are meshed with the first rack 2121 and the second rack 2221 to drive the first rod body 21 and the second rod body 22 to shrink inwards of the rod casing 1 or stretch outwards of the rod casing 1 synchronously, so that the lengths of the first rod body 21 and the second rod body 22, which can be used for hanging dumbbell pieces, are adjusted. The first rod body 21 and the second rod body 22 may be synchronously retracted toward the inside of the rod housing 1 when the rod housing 1 rotates clockwise, and the first rod body 21 and the second rod body 22 may be synchronously extended toward the outside of the rod housing 1 when the rod housing 1 rotates counterclockwise. When the lever housing 1 rotates clockwise, the first lever 21 and the second lever 22 extend out of the lever housing 1 in synchronization, and when the lever housing 1 rotates counterclockwise, the first lever 21 and the second lever 22 retract into the lever housing 1 in synchronization.

It should be noted that, even though the connecting rods in the related art are not provided with grooves, the rack on each connecting rod is in a one-to-one corresponding engagement with the gear disc in the connector at one end of the dumbbell rod, so as to avoid the engagement between the rack and the gear disc in the connector at the other end of the dumbbell rod, the rack cannot be arranged at the position of the connecting rod close to the connector at the other end, and the arrangement length of the rack is shorter, so that the travel is shorter.

Referring to fig. 2 and 3, the transmission assembly 4 includes a ring gear 41 and a drive gear 42 that mesh. The ring gear 41 is fixedly connected to the lever housing 1. The driving gear 42 is fixedly connected to the transmission gear 31 and is rotatable coaxially with the transmission gear 31. Alternatively, the drive gear 42 is fixedly coupled to the reversing gear 32 and is capable of rotating coaxially with the reversing gear 32. When the lever housing 1 rotates, the gear ring 41 fixedly connected to the lever housing 1 can synchronously rotate, the driving gear 42 is driven to rotate by the engagement of the gear ring 41 and the driving gear 42, and then the driving gear 42 can drive the transmission gear 31 or the reversing gear 32 fixedly connected to the driving gear 42 to synchronously rotate, and the transmission gear 31 and the reversing gear 32 are mutually meshed, so that either the transmission gear 31 or the reversing gear 32 is directly driven by the driving gear 42, and the other can be synchronously driven.

In the present embodiment, the first rack 2121 and the second rack 2221 each extend in the axial direction of the lever housing 1. The transmission gear 31 and the reversing gear 32 are each disposed at a side-by-side interval in the axial direction of the lever housing 1. The transmission gear 31 and the reversing gear 32 are spur gears, and the rotation axis of the transmission gear 31 and the rotation axis of the reversing gear 32 are located in the radial direction of the lever housing 1. The drive gear 42 is a bevel gear, and the rotational axes of the drive gears 42 are located in the radial direction of the lever housing 1. The ring gear 41 is a bevel gear, and the rotational axes of the ring gears 41 are all located in the axial direction of the lever housing 1.

The ring gear 41 and the drive gear 42 are located at the axial middle of the lever housing 1, and the gear assembly 3 is symmetrically disposed with respect to the axial middle of the lever housing 1. The driving forces transmitted to the symmetrical two transfer gears 31 and the symmetrical two reversing gears 32 by the ring gear 41 and the driving gear 42 are equal, so that the telescoping process of the first rod body 21 and the second rod body 22 is smoother.

Referring to fig. 4 and 5, two symmetrically arranged rows of mounting holes are provided on both sides of the lever housing 1. The assembly hole row includes a first assembly hole and a second assembly hole. At least two first assembly holes are arranged side by side at intervals, and a second assembly hole is arranged between every two adjacent first assembly holes. The gear assembly 3 further comprises a first mounting shaft 33 fixedly connected to the axis of the transmission gear 31 and a second mounting shaft 34 fixedly connected to the axis of the reversing gear 32. The two ends of the first assembling shaft 33 are rotatably arranged in two symmetrical first assembling holes in two rows of assembling holes respectively, so that the rotating track of the first gear is more stable. The two ends of the second assembly shaft 34 are rotatably inserted into two symmetrical second assembly holes in the two rows of assembly holes respectively, so that the rotation track of the second gear is more stable.

The pole housing 1 comprises an outer housing 11 and a pole barrel 12 fixedly connected within the outer housing 11. The mounting holes are arranged on the barrel 12. The outer shell 11 is used as an outer holding part, and an opening is not needed on the outer shell 11, so that the holding feel is more comfortable.

The rod assembly 2 is disposed through the barrel 12. The transmission gear 31 and the reversing gear 32 are both arranged in the pole barrel 12, and the transmission assembly 4 is arranged between the outer shell 11 and the pole barrel 12. One of the first mounting shafts 33 or one of the second mounting shafts 34 extends between the outer housing 11 and the barrel 12 and is connected to the transmission assembly 4. In the present embodiment, the first fitting shaft 33 extends between the outer housing 11 and the barrel 12, and the drive gear 42 is fixedly connected to the first fitting shaft 33, that is, the drive gear 42 is rotatable coaxially with the transmission gear 31, and the ring gear 41 is fixedly connected to the outer housing 11.

In other embodiments, the second assembly shaft 34 may extend between the outer housing 11 and the barrel 12, and the driving gear 42 is fixedly connected to the second assembly shaft 34, that is, the driving gear 42 can rotate coaxially with the transmission gear 31.

The gear ring 41 may also be fixedly connected to the barrel 12. The gear ring 41 can be fixedly connected to the outer shell 11 and the rod barrel 12 at the same time, so that the structural strength of the gear ring 41 is improved.

The barrel 12 includes a first portion 121 and a second portion 122 that snap together. The first assembly hole is formed by encircling two first semicircle holes respectively arranged on the first part 121 and the second part 122. The second assembly hole is formed by encircling two second semicircular holes respectively arranged on the first part 121 and the second part 122. During assembly, the gear assembly 3 can be firstly installed on the first part 121, the installation positions of the driving gear 31 and the reversing gear 32 are positioned by the first semicircular holes on the first part 121, and then the second part 122 is buckled on the first part 121, so that the assembly efficiency is improved.

The first assembling shafts 33 are respectively rotatably arranged at two ends in the two first assembling holes in a penetrating way and are provided with shaft shoulders so as to prevent the transmission gear 31 from radial movement. The second assembly shafts 34 are rotatably inserted into the two second assembly holes, and have shoulders at two ends thereof, respectively, so as to prevent the reversing gear 32 from radial movement.

Referring to fig. 5 and 6, the first rod 21 includes two first reinforcing bars 211 and a first connecting bar 212 connected between the two first reinforcing bars 211. The first reinforcing strips 211 are spaced apart to form first mounting grooves. The first connecting bar 212 is provided with a first rack 2121, and the first rack 2121 is located at the bottom surface of the first mounting groove. The second rod 22 includes two second reinforcing bars 221 and a second connecting bar 222 connected between the two second reinforcing bars 221. The second reinforcing bars 221 are spaced apart to form a second mounting groove. The second connecting bar 222 is provided with a second rack 2221, and the second rack 2221 is located at the bottom surface of the second mounting groove. The transmission gear 31 and the reversing gear 32 extend into the first mounting groove and the second mounting groove. The first reinforcing strips 211 increase the structural strength of the first rod body 21, the second reinforcing strips 221 increase the structural strength of the second rod body 22, meanwhile, the first mounting grooves for mounting the transmission gear 31 and the reversing gear 32 are reserved by the two first reinforcing strips 211, and the second mounting grooves for mounting the transmission gear 31 and the reversing gear 32 are reserved by the two second reinforcing strips 221, so that the dumbbell weight adjusting rod is more compact in structure.

The first rod 21 further includes a first mounting shaft 213 at one end, and the two first reinforcing strips 211 and the first connecting strip 212 are connected to the first mounting shaft 213. The second rod 22 further includes a second mounting shaft 223 at one end. Both the second reinforcing bars 221 and the second connecting bars 222 are connected to the second mounting shaft 223. The first mounting shaft 213 and the second mounting shaft 223 may be used to attach a locking member to secure the dumbbell piece to the first rod 21 and the second rod 22.

While the utility model has been described with reference to several exemplary embodiments, it is to be understood that the terminology used is intended to be in the nature of words of description and of limitation. As the present utility model may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims (10)

1. A dumbbell weight adjustment lever, comprising:

A lever housing;

The rod assembly is arranged in the rod shell in a penetrating mode and comprises a first rod body and a second rod body which are buckled with each other, a first rack is arranged on the first rod body, and a second rack is arranged on the second rod body;

The gear assembly is arranged in the rod shell and between the first rack and the second rack, the gear assembly comprises transmission gears and reversing gears which are meshed with each other, at least two transmission gears are arranged side by side at intervals, the reversing gears are arranged between every two adjacent transmission gears, the transmission gears are identical in steering through the reversing gears, the diameter of each transmission gear is larger than that of the reversing gear, and the transmission gears are meshed with the first rack and the second rack;

The transmission assembly is arranged in the rod shell and is in transmission connection with the rod shell and the gear assembly, so that the first rod body and the second rod body can be driven to stretch and retract when the rod shell rotates.

2. The dumbbell weight adjustment lever of claim 1, wherein the transmission assembly includes a meshed ring gear and drive gear;

the gear ring is fixedly connected to the rod shell;

The driving gear is fixedly connected to the transmission gear and can coaxially rotate with the transmission gear; or, the driving gear is fixedly connected to the reversing gear and can coaxially rotate with the reversing gear.

3. The dumbbell weight adjustment lever of claim 2, wherein the first rack and the second rack each extend in an axial direction of the lever housing;

The transmission gear and the reversing gear are arranged side by side at intervals along the axial direction of the rod shell;

The transmission gear and the reversing gear are straight gears, and the rotation axis of the transmission gear and the rotation axis of the reversing gear are located in the radial direction of the rod shell;

The driving gear is a bevel gear, and the rotation axes of the driving gear are all positioned in the radial direction of the rod shell;

The gear ring is a bevel gear, and the rotation axes of the gear ring are all positioned in the axial direction of the rod shell.

4. The dumbbell weight adjusting lever of claim 3, wherein the ring gear and the driving gear are located at a central portion in an axial direction of the lever housing;

The gear assembly is symmetrically disposed with respect to the axial middle of the lever housing.

5. The dumbbell weight adjusting lever of claim 1, wherein two symmetrically arranged rows of mounting holes are provided on both sides of the lever housing;

the assembly hole row comprises a first assembly hole and a second assembly hole;

At least two first assembly holes are arranged side by side at intervals, and the second assembly holes are arranged between every two adjacent first assembly holes;

The gear assembly further comprises a first assembly shaft fixedly connected to the transmission gear shaft line and a second assembly shaft fixedly connected to the reversing gear shaft line;

the two ends of the first assembly shaft are respectively rotatably arranged in two symmetrical first assembly holes in two rows of assembly hole rows in a penetrating manner;

the two ends of the second assembly shaft are respectively rotatably arranged in two symmetrical second assembly holes in two rows of assembly hole rows in a penetrating mode.

6. The dumbbell weight adjustment lever of claim 5, wherein the lever housing includes an outer housing and a lever barrel fixedly connected within the outer housing;

the assembly holes are arranged on the pole barrel;

the rod assembly is arranged in the rod barrel in a penetrating way;

the transmission gear and the reversing gear are both arranged in the pole barrel,

The transmission assembly is arranged between the outer shell and the rod barrel;

One of the first assembly shafts or one of the second assembly shafts extends out between the outer shell and the rod barrel and is connected with the transmission assembly.

7. The dumbbell weight adjustment lever of claim 6, wherein the lever barrel includes a first portion and a second portion that snap-fit;

The first assembly holes are formed by encircling two first semicircular holes which are respectively arranged on the first part and the second part;

the second assembly holes are formed by encircling two second semicircular holes which are respectively arranged on the first part and the second part.

8. The dumbbell weight adjusting lever of claim 5, wherein the first assembly shafts are rotatably inserted into the two first assembly holes, respectively, and have shoulders at both ends thereof;

The second assembly shafts are respectively rotatably arranged at two ends in the second assembly holes in a penetrating mode, and shaft shoulders are arranged at two ends in the second assembly holes.

9. The dumbbell weight adjustment lever of claim 1, wherein the first lever body includes two first reinforcing bars and a first connecting bar connected between the two first reinforcing bars;

a first mounting groove is formed between the two first reinforcing strips at intervals;

a first rack is arranged on the first connecting strip and is positioned on the bottom surface of the first mounting groove;

The second rod body comprises two second reinforcing strips and a second connecting strip connected between the two second reinforcing strips;

a second mounting groove is formed between the two second reinforcing strips at intervals;

A second rack is arranged on the second connecting bar and is positioned on the bottom surface of the second mounting groove;

the transmission gear and the reversing gear extend into the first mounting groove and the second mounting groove.

10. The dumbbell weight adjustment lever of claim 9, wherein the first lever body further comprises a first mounting shaft at one end;

The two first reinforcing strips and the first connecting strip are connected to the first mounting shaft;

The second rod body further comprises a second installation shaft positioned at one end;

The two second reinforcing strips and the second connecting strip are connected to the second mounting shaft.