CN213144144U

CN213144144U - Conversion piece and transmission device

Info

Publication number: CN213144144U
Application number: CN202021329794.3U
Authority: CN
Inventors: 李树鹏; 邓陈
Original assignee: Shenzhen Hopo Window Control Technology Co Ltd
Current assignee: Shenzhen Hopo Window Control Technology Co Ltd
Priority date: 2020-07-07
Filing date: 2020-07-07
Publication date: 2021-05-07
Anticipated expiration: 2030-07-07

Abstract

The utility model provides a conversion piece and a transmission device, wherein, the transmission device comprises a shell, a transmission piece, a driving piece and a conversion piece; the transmission piece, the conversion piece and the driving piece are arranged on the shell; the conversion piece comprises an annular part and an arc-shaped part; the arc-shaped part is arranged on the outer surface of the annular part through the inner surface; the outer surface of the annular part is provided with a plurality of first tooth parts at intervals; a plurality of second tooth parts are arranged on the outer surface of the arc-shaped part at intervals; the first tooth part of the conversion part is meshed with the first tooth shape on the outer side of the driving part, the second tooth part of the conversion part is meshed with the second tooth shape on the transmission part, and the transmission part is driven to transmit through the conversion part when the driving part rotates. The utility model discloses in, when the distance between driving piece and the driving medium is great, use the utility model provides a driving piece and driving medium are connected to the converting element, can use the space that driving piece and driving medium occupy the casing still less than using major diameter gear connection among the prior art.

Description

Conversion piece and transmission device

Technical Field

The utility model relates to a five metals technical field, concretely relates to converter and transmission.

Background

The rotating handle of the door and window is usually connected with the lock rod through a transmission device; the transmission device generally comprises a shell, a fixed part, a driving part and a transmission part; the fixing piece, the driving piece and the transmission piece are arranged on the shell; the fixed part is used for mounting a rotary handle; the driving piece is connected with the transmission piece; rotate handle installation back and be connected with the driving piece through its pivot to through the transmission of driving piece drive driving medium. In the prior art, some driving parts on the transmission device can be connected with the transmission part through the gears, when the interval between the driving part and the transmission part is large, the diameter of the used gear is large, and the gear with the large diameter can occupy more space of the shell.

SUMMERY OF THE UTILITY MODEL

Based on the problem of prior art, the utility model provides a converter and transmission.

The utility model provides a conversion piece, which comprises an annular part and an arc part; the arc-shaped part is arranged on the outer surface of the annular part through the inner surface; the outer surface of the annular part is provided with a plurality of first tooth parts at intervals; a plurality of second tooth parts are arranged on the outer surface of the arc-shaped part at intervals.

Further, the inner surface of the arc-shaped part is provided with a groove corresponding to the first tooth parts, and a bulge corresponding to a gap between the first tooth parts; when the arc-shaped part is arranged on the outer surface of the annular part, the first tooth parts are clamped into the grooves, and the protrusions are clamped into gaps among the first tooth parts.

Further, the conversion piece further comprises a rotating shaft; the rotating shaft is arranged in the middle of the annular part, one end of the rotating shaft protrudes out of one side of the annular part, and the other end of the rotating shaft protrudes out of the other side of the annular part; the conversion piece is rotatably arranged on the shell through two ends of the rotating shaft.

Further, the arc portion, the ring portion, the first tooth portion, the second tooth portion, and the rotation shaft are integrally formed.

The utility model also provides a transmission device, which comprises a shell, a transmission part, a driving part and a conversion part;

the transmission piece, the conversion piece and the driving piece are arranged on the shell;

the conversion piece comprises an annular part and an arc-shaped part; the arc-shaped part is arranged on the outer surface of the annular part through the inner surface; the outer surface of the annular part is provided with a plurality of first tooth parts at intervals; a plurality of second tooth parts are arranged on the outer surface of the arc-shaped part at intervals; wherein,

the first tooth part of the conversion part is meshed with the first tooth shape on the outer side of the driving part, the second tooth part of the conversion part is meshed with the second tooth shape on the transmission part, and the transmission part is driven to transmit through the conversion part when the driving part rotates.

Further, the shell comprises a bottom shell and a face shell; the face shell is arranged on the bottom shell in a covering mode and forms an installation cavity with the bottom shell in an enclosing mode, and the driving piece and the conversion piece are arranged in the installation cavity.

Further, the bottom shell and the face shell are correspondingly provided with rotating holes; one end of the rotating shaft is rotatably arranged in the rotating hole of the bottom shell, and the other end of the rotating shaft is rotatably arranged in the rotating hole of the face shell.

The utility model has the advantages that: because second tooth portion is used for the second profile of tooth meshing with the transfer line, so arc portion and second tooth portion all are close to driving medium one side, can not occupy the space of driving piece one side, and in the in-service use, the converting element needs the pivoted angle not big, and arc portion can not rotate driving piece one side, so when the distance between driving piece and the driving medium is great, use the utility model provides a driving piece and driving medium are connected to the converting element, can use among the prior art that the space that driving piece and driving medium occupy the casing still less than using major diameter gear connection driving piece and driving medium.

Drawings

Fig. 1 is a schematic structural diagram of a transmission device provided by the present invention;

fig. 2 is an exploded view of a transmission according to the present invention;

fig. 3 is a schematic view of a part of a transmission device provided by the present invention;

fig. 4 is a sectional view of a transmission provided by the present invention;

fig. 5 is a schematic structural diagram of a housing provided by the present invention;

fig. 6 is a schematic structural diagram of a fixing member provided in the present invention;

fig. 7 is an assembly schematic view of a transmission and a rotary handle provided by the present invention;

fig. 8 is an assembly schematic view of a transmission and another rotary handle provided by the present invention;

fig. 9 is a schematic structural diagram of a driving member provided by the present invention;

fig. 10 is a schematic structural view of a positioning member provided in the present invention;

fig. 11 is a schematic structural diagram of a bottom case according to the present invention;

fig. 12 is a schematic structural diagram of a face shell according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that all directional indicators (such as up, down, left, right, front, back, horizontal, vertical, etc.) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. under a certain posture (as shown in the drawings), if the certain posture changes, the directional indicator changes accordingly, the "connection" may be a direct connection or an indirect connection, and the "setting", and "setting" may be directly or indirectly set.

In addition, descriptions in the present application as to "first", "second", and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

Fig. 1 is a schematic structural diagram of a transmission device provided by the present invention, and fig. 2 is an exploded view of a transmission device provided by the present invention; fig. 3 is a schematic view of a part of a transmission device provided by the present invention; fig. 4 is a sectional view of a transmission provided by the present invention; the transmission device comprises a shell 10, a transmission piece 20, a driving piece 40 and a fixing piece 30; the fixing member 30, the driving member 40 and the transmission member 20 are disposed on the housing 10; the driving member 40 is connected with the transmission member 20; the fixing member 30 is used for mounting the rotary handle 100; the rotary handle 100 is connected to the actuating element 40 via its pivot 102, so that the actuating element 40 drives the transmission element 20.

In one embodiment, as shown in fig. 1, 5 to 8, the housing 10 is provided with a mounting hole 16 corresponding to the fixing member 30, and the fixing member 30 is disposed in the mounting hole 16 and can move along the length direction of the mounting hole 16, so that the fixing member 30 can protrude out of the mounting hole 16 toward the outside of the housing 10; a first limiting part 32 is arranged on the outer side of the fixing part 30; a second limiting part 17 is arranged in the mounting hole 16; when the fixing member 30 extends out of the mounting hole 16 to reach the predetermined position, the second position-limiting portion 17 abuts against the first position-limiting portion 32.

In this embodiment, the preset position may be set according to actual needs, for example, the preset position may be a position where one quarter, one third, one half or two thirds of the fixing member 30 protrudes from the mounting hole 16.

In this embodiment, a fastener 30 is generally disposed in one of the mounting holes 16; a rotary handle 100 is typically secured by two set screws 101; a fixing member 30 is usually matched with a fixing screw 101, so when the rotary handle 100 is fixed, after one fixing member 30 is pulled out of the shell 10 by the fixing screw 101, the rotary handle 100 cannot be fixed, and the normal use of the transmission device is influenced. In this embodiment, when the fixing member 30 extends out of the mounting hole 16 and reaches the preset position, the second limiting portion 17 abuts against the first limiting portion 32 to limit the fixing member 30, so as to prevent the fixing member 30 from being completely pulled out of the mounting hole 16 by the fixing screw 101, thereby avoiding the situation that the rotating handle 100 cannot be fixed.

In the embodiment, the shape of the fixing member 30 may be set according to specific needs, and may be a cylindrical shape, a square shape, or an irregular shape, and the shape of the mounting hole 16 matches the shape of the fixing member 30.

In one embodiment, each fixture 30 is provided with at least two threaded holes 31.

In this embodiment, the opening direction of the screw hole 31 is generally the same as the opening direction of the mounting hole 16, and the rotation handle 100 is generally provided with a fixing hole through which the fixing screw 101 is passed to be screwed with the screw hole 31 from being passed through the corresponding screw hole 31. A fixing screw 101 is usually matched with a fixing hole, so that there are usually two fixing holes on the rotary handle 100, and the pitch between the two fixing holes of different kinds of rotary handles 100 is usually different, so that in this embodiment, as shown in fig. 5 to 8, the fixing member 30 is provided with at least two threaded holes 31, so that it is possible to match different kinds of rotary handles 100 to increase the applicability of the transmission device. It will be appreciated that in other embodiments, the fixing member 30 may be provided with only one threaded hole 31.

In an embodiment, when there are more than two screw holes 31 of the fixing member 30, the diameter of each screw hole 31 is different, and since the fixing screws 101 used for different kinds of the rotary handle 100 may be different, the diameter of each screw hole 31 is set to be different, which may further increase the applicability of the transmission. It will be appreciated that in other embodiments, the bore diameter of each threaded bore 31 may be the same.

In one embodiment, as shown in fig. 1, 5, 7 and 8, the mounting hole 16 is provided with two opposite openings, and the fixing member 30 may protrude from the two openings of the mounting hole 16; each threaded hole 31 is also provided with two opposite openings, one opening direction of the threaded hole 31 is the same as that of the mounting hole 16, and the other opening direction of the threaded hole 31 is the same as that of the mounting hole 16; the first position-limiting part 32 comprises two parts, and the two parts of the first position-limiting part 32 are respectively arranged at different positions outside the fixing part 30; the second limiting part 17 comprises two parts, and the two parts of the second limiting part 17 are respectively arranged at different positions in the mounting hole; when the fixing member 30 extends out of one opening to a preset position, a part of the second limiting portion 17 abuts against a part of the first limiting portion 32; when the fixing member 30 extends out from the other opening to a predetermined position, the other part of the second position-limiting portion 17 abuts against the other part of the first position-limiting portion 32.

In the prior art, the mounting hole 16 and the threaded hole 31 are usually only opened on one side, and after the transmission device is mounted on a profile, the problem that the direction of the shell 10 or the fixing piece 30 is reversed easily occurs, the shell 10 or the fixing piece 30 needs to be dismounted, and the direction is adjusted to be mounted again, so that the mounting efficiency is reduced, and the labor cost is increased. In this embodiment, the two openings of the mounting hole 16 are located at two opposite sides of the housing 10, and two sides of the threaded hole 31 on the fixing member 30 are both provided with openings, so that the rotary handle 100 can be mounted at two sides of the housing 10, and the problems that the housing 10 or the fixing member 30 is reversely mounted, the housing 10 or the fixing member 30 needs to be detached, and the direction is adjusted and then the rotary handle is mounted again do not occur; in addition, the second limiting portion 17 and the first limiting portion 32 of the present embodiment each include two portions, and when the two fixing members 30 are pulled out from the openings on both sides of the mounting hole 16, both the two fixing members can be limited by the second limiting portion 17 and the first limiting portion 32, so that the fixing members 30 are prevented from being pulled out of the mounting hole 16 completely; and because the mounting hole 16 and the threaded hole 31 are provided with two openings, the fixing screw 101 can penetrate through the fixing piece 30 and the shell 10, the accuracy of the fixing screw 101 does not need to be calculated, and the requirement of the manufacturing process of the fixing screw 101 is greatly reduced.

In one embodiment, when the mounting holes 16 and the threaded holes 31 have two opposite openings, a portion of the second limiting portion 17 is disposed on the inner peripheral edge of the opening of one mounting hole 16, another portion of the second limiting portion 17 is disposed on the inner peripheral edge of the opening of the other mounting hole 16, a portion of the first limiting portion 32 is disposed on the outer peripheral edge of the opening of one threaded hole 31, and another portion of the first limiting portion 32 is disposed on the outer peripheral edge of the opening of the other threaded hole 31.

In the present embodiment, the second stopper portion 17 is provided at the inner peripheral edge of the opening of the mounting hole 16, and the first stopper portion 32 is provided at the outer peripheral edge of the opening of the threaded hole 31, so that the fixing member 30 can be pulled out of the mounting hole 16 to the maximum after being mounted. It is understood that in other embodiments, the first position-limiting portion 32 may be disposed near the middle of the fixing member 30, or disposed at other positions where it can be snapped to the second position-limiting portion 17; the second position-limiting portion 17 may be provided near the middle of the mounting hole 16, or may be provided at another position where it can be snapped to the first position-limiting portion 32.

In one embodiment, each of the second position-limiting portions 17 includes at least one second position-limiting wall 171, one side of the second position-limiting wall 171 is connected to the wall of the mounting hole 16, and the other side extends into the mounting hole 16; each part of the first limiting portion 32 at least includes a first limiting wall 321, one side of the first limiting wall 321 is connected to the outer wall of the fixing member 30, and the other side extends away from the threaded hole 31.

In this embodiment, each part of the second position-limiting portion 17 may include one, two, or more second position-limiting walls 171; each of the partial first stopper portions 32 may include one, two or more first stopper walls 321. In other embodiments, the second position-limiting portion 17 and the first position-limiting portion 32 may include a protruding block, so that the fixing member 30 can be limited by the second position-limiting portion 17 and the first position-limiting portion 32 abutting against each other.

In one embodiment, as shown in fig. 2 to 4 and 9, the transmission device further includes a switching member 60, the switching member 60 including an annular portion 61 and an arc portion 63; the arc portion 63 is provided on the outer surface of the annular portion 61 through the inner surface; wherein, a plurality of first tooth parts 62 are arranged on the outer surface of the annular part 61 at intervals; the outer surface of the arc-shaped portion 63 is provided with a plurality of second tooth portions 64 at intervals.

In this embodiment, the switching element 60 can be engaged with the first tooth form 41 outside the driving element 40 through the first tooth portion 62, the switching element 60 can be engaged with the second tooth form 21 on the transmission element 20 through the second tooth portion 64, the driving element 40 is driven to rotate when the rotating shaft 102 rotates, and the transmission element 20 is driven to transmit through the switching element 60 when the driving element 40 rotates.

In the prior art, the driving member 40 and the transmission member 20 are usually connected by a gear, when the distance between the driving member 40 and the transmission member 20 is large, the diameter of the gear is required to be large, and the gear with the large diameter has a large volume, and occupies a large space of the housing 10. In the present embodiment, since the second tooth portion 64 is used to engage with the second tooth form 21 of the transmission member 20, the arc portion 63 and the second tooth portion 64 are both close to the transmission member 20, and do not occupy the space on the side of the driving member 40, and in practical use, the angle that the switching member 60 needs to rotate is not large, and the arc portion 63 does not rotate to the side of the driving member 40, so when the distance between the driving member 40 and the transmission member 20 is large, the use of the switching member 60 to connect the driving member 40 and the transmission member 20 in the present embodiment can occupy less space on the housing 10 than the use of a large-diameter gear to connect the driving member 40 and the transmission member 20 in the prior art.

In an embodiment, as shown in fig. 9, when the arc portion 63 is disposed on the outer surface of the ring portion 61, the first tooth portion 62 is clamped into the groove, and the protrusion is clamped into the gap between the first tooth portions 62, so that the arc portion 63 has better stress strength.

In one embodiment, as shown in fig. 9, the converting element 60 further includes a rotating shaft 65, the rotating shaft 65 is disposed in the middle of the annular portion 61, and one end thereof protrudes out of one side of the annular portion 61 and the other end thereof protrudes out of the other side of the annular portion 61; the conversion member 60 is rotatably provided on the housing 10 by both ends of the rotation shaft 65.

In one embodiment, the arc portion 63, the annular portion 61, the first tooth portion 62, the second tooth portion 64 and the rotation shaft 65 are integrally formed to improve the structural strength of the shifter 60. It will be appreciated that in other embodiments, the arcuate portion 63 and the annular portion 61, etc. may be manufactured separately and then secured to each other by a securing member.

In an embodiment, as shown in fig. 2, 3 and 10, the transmission device further includes a positioning member 50, the positioning member 50 includes a mounting portion 51, an elastic portion 52 and a positioning portion 53; the elastic portion 52 is provided on the mounting portion 51, and the positioning portion 53 is provided on the elastic portion 52.

In this embodiment, the outer wall of the fixing member 30 is provided with a positioning structure 33, the positioning member 50 is provided with a positioning portion 53, and the positioning portion 53 is engaged with the positioning structure 33; when the fixing member 30 is retracted to the initial position in the mounting hole 16, the positioning portion 53 and the positioning structure 33 are engaged with each other, so that the fixing member 30 can be positioned at the initial position. When the user uses the fixing member, the user can quickly judge whether the fixing member 30 returns to the initial position; since the positioning portion 53 is disposed on the elastic portion 52 having elasticity, when the fixing member 30 is pulled out, the fixing member 30 can push the positioning member 50 away against the elasticity of the elastic portion 52, and when the fixing member 30 returns to the initial position, the elastic portion 52 can push the positioning portion 53 out of engagement with the positioning structure 33 of the fixing member 30. In this embodiment, the initial position of the fixing member 30 is the initial position where the fixing member 30 is mounted on the housing 10, and at this time, the fixing member 30 is not yet pulled out of the housing 10 by the fixing screw 101.

In the embodiment, one fixing member 30 can complete the positioning of the initial position by using one positioning member 50, and the positioning assembly formed by combining a plurality of components is not needed for the positioning, so that the structure of the transmission device is simplified, and the failure rate of the transmission device is reduced. In the present embodiment, since the fixing members 30 are generally provided in two, the positioning members 50 are also generally provided in two, corresponding to the fixing members 30 one by one.

It is understood that, in other embodiments, one or more than two fixing pieces 30 may be provided, and when there is only one fixing piece 30, the fixing screw 101 for fixing the rotation handle 100 and the fixing piece 30 are fixed to each other; when there are more than two fixing pieces 30, the fixing screw 101 for fixing the rotary handle 100 is fixed to each fixing piece 30; alternatively, one fixing member 30 may be positioned in cooperation with more than two positioning members 50.

In one embodiment, the mounting portion 51, the elastic portion 52 and the positioning portion 53 are integrally formed, so that the structural strength of the positioning member 50 is better, and it is understood that in other embodiments, the mounting portion 51, the elastic portion 52 and the positioning portion 53 may be separately manufactured and then fixed to each other by a fixing member.

In one embodiment, the mounting portion 51, the elastic portion 52 and the positioning portion 53 are made of elastic material, such as silicone, rubber, plastic, polyoxymethylene (polyformaldehyde) or polypropylene (polypropylene).

In one embodiment, as shown in FIG. 10, the mounting portion 51 includes a mounting arm 511; the elastic portion 52 includes elastic arms 521; the elastic arm 521 is arc-shaped, and two ends of the elastic arm are respectively connected to the mounting arms 511; wherein the positioning portion 53 is provided on the arc-shaped elastic arm 521. Preferably, one end of the elastic arm 521 is connected to one end of the mounting arm 511, and the other end of the elastic arm 521 is connected to the other end of the mounting arm 511; wherein the arc-shaped elastic arm 521 has a curved peak 5211, and the positioning portion 53 is disposed on the curved peak 5211. It will be appreciated that in other embodiments, the mounting portion 51 may also comprise a mounting plate; the elastic portion 52 may also include an elastic plate, one end of the elastic plate is connected to the mounting plate, the other end of the elastic plate is spaced from the mounting plate and can move relative to the mounting plate, the positioning portion 53 is disposed at the other end of the elastic plate, and the mounting plate, the elastic plate and the positioning portion 53 are integrally formed.

In one embodiment, as shown in fig. 10, the positioning portion 53 includes a positioning protrusion 531, and the positioning structure 33 includes a positioning recess 331, and when the fixing member 30 returns to the initial position, the positioning protrusion 531 is snapped into the positioning recess 331.

In other embodiments, the positioning portion 53 may include a positioning recess 331, and the positioning structure 33 may include a positioning protrusion 531, wherein the positioning protrusion 531 is snapped into the positioning recess 331 when the fixing member 30 returns to the initial position.

In one embodiment, as shown in fig. 4, the housing 10 is provided with a sliding groove 13, and the transmission member 20 is disposed in the sliding groove 13.

In one embodiment, as shown in fig. 11 and 12, the positioning grooves 18 are disposed in the housing 10 corresponding to the mounting holes 16, wherein one positioning groove 18 is correspondingly communicated with one mounting hole 16, one positioning member 50 is disposed in one positioning groove 18, and the positioning portion 53 of the positioning member 50 can penetrate into the mounting hole 16 to be matched with the positioning structure 33.

In one embodiment, as shown in fig. 4, the housing 10 includes a front shell 12 and a bottom shell 11, the front shell 12 is disposed on the bottom shell 11 to form a mounting cavity 19 with the bottom shell 11, and the driving member 40 and the converting member 60 are disposed in the mounting cavity 19; the mounting cavity 19 is communicated with the sliding groove 13, and the part of the transmission member 20 provided with the second tooth form 21 penetrates into the mounting cavity 19 to be meshed with the second tooth form 64 of the conversion member 60 in the mounting cavity 19.

In one embodiment, as shown in fig. 11 and 12, the bottom case 11 is provided with positioning posts 112, the face cover 12 is provided with positioning holes 121, and when the face cover 12 is covered on the bottom case 11, the positioning posts 112 are inserted into the positioning holes 121 to quickly assemble the face cover 12 and the bottom case 11 together.

In one embodiment, as shown in fig. 11 and 12, the bottom shell 11 and the front shell 12 are correspondingly provided with mounting holes 15, and one end of the driving member 40 corresponds to the mounting hole 15 on the bottom shell 11, and the other end corresponds to the mounting hole 15 on the front shell 12, so that the rotating shaft 102 of the rotating handle 100 can penetrate into the mounting cavity 19 from the bottom shell or the front shell to be connected with the driving member 40.

In one embodiment, as shown in fig. 11 and 12, the bottom case 11 and the face case 12 are correspondingly provided with rotation holes 14, and the rotation shaft 65 is rotatably provided at one end in the rotation hole 14 of the bottom case 11 and at the other end in the rotation hole 14 of the face case 12 to position the converting element 60.

The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings, or directly or indirectly applied to other related technical fields, are included in the same way in the protection scope of the present invention.

Claims

1. A conversion element, wherein said conversion element comprises an annular portion and an arcuate portion; the arc-shaped part is arranged on the outer surface of the annular part through the inner surface; the outer surface of the annular part is provided with a plurality of first tooth parts at intervals; a plurality of second tooth parts are arranged on the outer surface of the arc-shaped part at intervals.

2. The shifter of claim 1, wherein an inner surface of the arcuate portion is provided with a groove corresponding to the first teeth and a protrusion corresponding to a gap between the first teeth; when the arc-shaped part is arranged on the outer surface of the annular part, the first tooth parts are clamped into the grooves, and the protrusions are clamped into gaps among the first tooth parts.

3. The conversion element of claim 1, wherein said conversion element further comprises a rotating shaft; the rotating shaft is arranged in the middle of the annular part, one end of the rotating shaft protrudes out of one side of the annular part, and the other end of the rotating shaft protrudes out of the other side of the annular part; the conversion piece is rotatably arranged on the shell through two ends of the rotating shaft.

4. The shifter of claim 3, wherein the arcuate portion, the annular portion, the first toothed portion, the second toothed portion, and the rotational shaft are integrally formed.

5. A transmission device is characterized by comprising a shell, a transmission piece, a driving piece and a conversion piece;

6. The transmission of claim 5, wherein the inner surface of the arc-shaped portion is provided with a groove corresponding to the first tooth portion and a protrusion corresponding to a gap between the first tooth portions; when the arc-shaped part is arranged on the outer surface of the annular part, the first tooth parts are clamped into the grooves, and the protrusions are clamped into gaps among the first tooth parts.

7. The transmission of claim 5, wherein said conversion member further comprises a rotating shaft; the rotating shaft is arranged in the middle of the annular part, one end of the rotating shaft protrudes out of one side of the annular part, and the other end of the rotating shaft protrudes out of the other side of the annular part; the conversion piece is rotatably arranged on the shell through two ends of the rotating shaft.

8. The transmission of claim 7, wherein said arcuate portion, said annular portion, said first toothed portion, said second toothed portion and said rotatable shaft are integrally formed.

9. The transmission of claim 7, wherein said housing includes a bottom shell and a face shell; the face shell is arranged on the bottom shell in a covering mode and forms an installation cavity with the bottom shell in an enclosing mode, and the driving piece and the conversion piece are arranged in the installation cavity.

10. The transmission of claim 9, wherein said bottom housing and said face housing are correspondingly provided with rotation holes; one end of the rotating shaft is rotatably arranged in the rotating hole of the bottom shell, and the other end of the rotating shaft is rotatably arranged in the rotating hole of the face shell.