CN215058993U

CN215058993U - Shaft coupling

Info

Publication number: CN215058993U
Application number: CN202121452835.2U
Authority: CN
Inventors: 贺秋冬; 桂洋; 王志炫; 李伟; 陈嘉明; 郭程程
Original assignee: Hubei Engineering University
Current assignee: Hubei Engineering University
Priority date: 2021-06-28
Filing date: 2021-06-28
Publication date: 2021-12-07
Anticipated expiration: 2031-06-28

Abstract

The utility model provides a coupler, which is used for the transmission of a double driving shaft and a double driven shaft, wherein the double driving shaft comprises an inner driving shaft and an outer driving shaft which are sequentially sleeved along the inner direction and the outer direction; the holding cavity is located to interior axle sleeve, and interior axle sleeve is equipped with the third connecting portion in the ascending one end of axial, and the other end is equipped with the fourth connecting portion, and the third connecting portion are used for connecting interior driving shaft, and the fourth connecting portion are used for connecting interior driven shaft. The scheme enables the outer driven shaft and the inner driven shaft to rotate in the same direction or in the reverse direction, and the transmission connection of the double driving shafts and the double driven shafts is realized.

Description

Shaft coupling

Technical Field

The utility model relates to a mechanical transmission technical field especially relates to a coupler.

Background

A shaft coupling, also called a shaft coupling, is a widely used transmission component, which is mainly used for coupling two shafts together to rotate together and transmit torque, so as to firmly couple a driving shaft and a driven shaft in different mechanisms to rotate together and transmit motion and torque, and is sometimes used for coupling the shafts with other parts, such as gears, belt wheels, and the like. However, the existing coupler can only connect two single shafts, namely, one driving shaft is connected with one driven shaft in a transmission manner, but cannot meet the requirement that the double driving shafts are connected with the double driven shafts in a transmission manner, namely, the driving shafts can not meet the requirement that the driving shafts comprise inner driving shafts and outer driving shafts which are sequentially sleeved along the inner direction and the outer direction, and the driven shafts comprise inner driven shafts and outer driven shafts which are sequentially sleeved along the inner direction and the outer direction.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a shaft coupling aims at improving the requirement that the shaft coupling among the prior art can not satisfy two driving shafts and two driven shaft transmission and is connected, can not satisfy the driving shaft promptly and include along interior external to overlapping the interior driving shaft and the outer driving shaft of establishing in proper order, the driven shaft includes along the interior external to overlapping the technical problem that the transmission between the interior driven shaft of establishing and the outer driven shaft is connected in proper order.

In order to achieve the above object, the utility model provides a coupler for the transmission of two driving shafts and two driven shafts, two driving shafts include along inside and outside to overlapping interior driving shaft and the outer driving shaft of establishing in proper order, two driven shafts include along inside and outside to overlapping interior driven shaft and the outer driven shaft of establishing in proper order, the coupler includes:

the outer shaft sleeve is provided with an accommodating cavity in a penetrating manner along the axial direction, one end of the outer shaft sleeve in the axial direction is provided with a first connecting part, the other end of the outer shaft sleeve is provided with a second connecting part, the first connecting part is used for connecting an outer driving shaft, and the second connecting part is used for connecting an outer driven shaft; and the number of the first and second groups,

the inner shaft sleeve is arranged in the accommodating cavity, a third connecting portion is arranged at one end of the inner shaft sleeve in the axial direction, a fourth connecting portion is arranged at the other end of the inner shaft sleeve, the third connecting portion is used for connecting the inner driving shaft, and the fourth connecting portion is used for connecting the inner driven shaft.

Optionally, the outer axle sleeve includes the first outer semi-axle sleeve and the second outer semi-axle sleeve that connect gradually along the direction of transmission, first outer semi-axle sleeve passes through along the axial and is equipped with first installation passageway, the second outer semi-axle sleeve passes through along the axial and is equipped with second installation passageway, first installation passageway intercommunication second installation passageway is in order to form hold the chamber, first connecting portion are located first outer semi-axle sleeve, second connecting portion are located the second outer semi-axle sleeve.

Optionally, the first connecting portion includes a first outer gear sleeve, a first through hole is axially formed through the first outer gear sleeve, the first through hole is used for the outer spindle to penetrate through, one end of the first outer gear sleeve is arranged in the first installation channel, so that the first through hole is communicated with the first installation channel, an outer crown gear is arranged on the periphery of one end, located at the first installation channel, of the first outer gear sleeve, an inner drum-shaped gear meshed with the outer crown gear is arranged on the inner wall of the first installation channel, and the first outer gear sleeve and the first outer half shaft sleeve are in matched transmission with the inner drum-shaped gear through the outer drum-shaped gear;

the second connecting portion comprises a second outer gear sleeve, a second through hole penetrates through the second outer gear sleeve in the axial direction, the second through hole is used for the outer driven shaft to penetrate through, one end of the second outer gear sleeve is arranged in the second mounting channel, so that the second through hole is communicated with the second mounting channel, outer crowned teeth are arranged on the periphery of one end, located on the second mounting channel, of the second outer gear sleeve, inner crowned teeth meshed with the outer crowned teeth are arranged on the inner wall of the second mounting channel, and the second outer gear sleeve and the second outer half shaft sleeve are in matched transmission with the inner crowned teeth through the outer crowned teeth.

Optionally, a first screwed part is arranged at one end of the first outer gear sleeve, which is far away from the first outer half shaft sleeve, and the first screwed part is used for being screwed with a threaded hole arranged on the outer driving shaft;

and one end of the second outer gear sleeve, which is far away from the second outer half shaft sleeve, is provided with a second screwed part, and the second screwed part is used for being in screwed connection with a threaded hole in the outer driven shaft.

Optionally, the coupling further comprises:

the first end cover is annularly arranged, is sleeved on the periphery of the first outer gear sleeve and is detachably arranged at one end, close to the first outer gear sleeve, of the first outer half shaft sleeve; and the number of the first and second groups,

the second end cover is annularly arranged, the second end cover is sleeved on the periphery of the second outer gear sleeve, and the second end cover is detachably mounted at one end, close to the second outer gear sleeve, of the second outer half shaft sleeve.

Optionally, the inner circumferential wall of the first end cover is recessed to form a first annular groove, and a first sealing ring is arranged in the first annular groove;

the inner peripheral wall of the second end cover is sunken to form a second annular groove, and a second sealing ring is arranged in the second annular groove.

Optionally, a third sealing ring is further arranged between the first end cover and the first outer half shaft sleeve, and a fourth sealing ring is further arranged between the second end cover and the second outer half shaft sleeve.

Optionally, the first outer half axle sleeve is towards the concave third ring channel that is equipped with of terminal surface of the second outer half axle sleeve, the third ring channel link up hold the chamber, the second outer half axle sleeve towards the protruding and be equipped with of terminal surface of the first outer half axle sleeve with third ring channel complex annular is protruding.

Optionally, the inner shaft sleeve comprises a first inner half shaft sleeve and a second inner half shaft sleeve which are sequentially connected along the transmission direction, a third installation channel penetrates through the first inner half shaft sleeve along the axial direction, a fourth installation channel penetrates through the second inner half shaft sleeve along the axial direction, the third installation channel is communicated with the fourth installation channel, the third connection portion is arranged on the first inner half shaft sleeve, and the fourth connection portion is arranged on the second inner half shaft sleeve.

Optionally, the third connecting portion includes a third outer gear sleeve, a third through hole is axially formed through the third outer gear sleeve, the third through hole is used for the inner spindle to penetrate through, one end of the third outer gear sleeve is disposed in the third mounting channel, so that the third through hole is communicated with the third mounting channel, an outer crown gear is disposed on an outer periphery of one end, located in the third mounting channel, of the third outer gear sleeve, an inner crown gear engaged with the outer crown gear is disposed on an inner wall of the third mounting channel, and the third outer gear sleeve and the first inner half shaft sleeve are in transmission through the outer crown gear and the inner crown gear;

the fourth connecting portion include the outer tooth cover of fourth, the outer tooth cover of fourth runs through along the axial and is equipped with the fourth through-hole, the fourth through-hole is used for supplying interior driven shaft wears to establish, fourth outer tooth cover one end is located the fourth installation passageway, so that the fourth through-hole intercommunication the fourth installation passageway, the outer tooth cover of fourth is located the periphery of the one end of fourth installation passageway is equipped with outer crown gear, be equipped with on the inner wall of fourth installation passageway with outer crown gear meshing complex interior drum-shaped tooth, the outer tooth cover of fourth with half axle sleeve passes through in the second outer crown gear with interior crown gear cooperation transmission.

The utility model provides a shaft coupling includes outer axle sleeve and inner shaft sleeve, outer axle sleeve has through holding the chamber along the axial, outer axle sleeve is equipped with first connecting portion to the ascending one end in axial, and the other end is equipped with the second connecting portion, first connecting portion are used for connecting outer driving shaft, the second connecting portion are used for connecting outer driven shaft; the inner shaft sleeve is arranged in the accommodating cavity, a third connecting portion is arranged at one end of the inner shaft sleeve in the axial direction, a fourth connecting portion is arranged at the other end of the inner shaft sleeve, the third connecting portion is used for connecting the inner driving shaft, and the fourth connecting portion is used for connecting the inner driven shaft. So, outer shaft liner connection outer driving shaft and outer driven shaft, interior axle sleeve is located hold the chamber, and connect interior driving shaft and interior driven shaft to mutual interference can not be during the drive of outer driving shaft and interior driving shaft, but make outer driven shaft and interior driven shaft syntropy rotate, also can reverse rotation, be connected with the transmission of two driven shafts in order to realize two driving shafts.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic perspective view of an embodiment of a coupler and dual driving shafts and dual driven shafts provided by the present invention;

FIG. 2 is a cross-sectional view of the coupling of FIG. 1 with dual drive shafts and dual driven shafts;

FIG. 3 is an enlarged schematic view at A in FIG. 2;

FIG. 4 is an enlarged schematic view at B of FIG. 2;

fig. 5 is an enlarged schematic view at C in fig. 2.

The reference numbers illustrate:

the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

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, if the present invention relates to a directional indication, the directional indication is only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture, and if the specific posture is changed, the directional indication is changed accordingly.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating 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 meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. Moreover, the technical solutions in the embodiments can 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 can not 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.

Present shaft coupling only can be connected two unipolar, and a driving shaft and a driven shaft transmission are connected promptly, but can not satisfy the requirement that two driving shafts and two driven shaft transmissions are connected, can not satisfy the driving shaft promptly and include along interior external to overlapping interior driving shaft and the outer driving shaft of establishing in proper order, and the driven shaft includes along interior external to overlapping the transmission connection between the interior driven shaft of establishing and the outer driven shaft in proper order.

In view of this, the utility model provides a coupler aims at improving the requirement that the shaft coupling among the prior art can not satisfy the diaxon and connect, can not satisfy the driving shaft promptly and include along inside and outside to overlapping the interior driving shaft and the outer driving shaft of establishing in proper order, the driven shaft includes along the inside and outside to overlapping the technical problem that the transmission between the interior driven shaft of establishing and the outer driven shaft is connected in proper order. Fig. 1 to fig. 5 show an embodiment of a coupling according to the present invention.

Referring to fig. 1 to 3, the coupling 100 according to the present invention is used for transmission between a dual driving shaft and dual driven shafts, wherein the dual driving shaft includes an inner driving shaft 230 and an outer driving shaft 210 sequentially sleeved along an inner direction and an outer direction, the dual driven shafts include an inner driven shaft 240 and an outer driven shaft 220 sequentially sleeved along an inner direction and an outer direction, the coupling 100 includes an outer shaft sleeve 1 and an inner shaft sleeve 2, the outer shaft sleeve 1 has a receiving cavity 1a axially extending therethrough, one end of the outer shaft sleeve 1 in the axial direction is provided with a first connecting portion, the other end of the outer shaft sleeve 1 is provided with a second connecting portion, the first connecting portion is used for connecting the outer driving shaft 210, and the second connecting portion is used for connecting the outer driven shaft 220; the inner shaft sleeve 2 is arranged in the accommodating cavity 1a, one end of the inner shaft sleeve 2 in the axial direction is provided with a third connecting portion, the other end of the inner shaft sleeve 2 is provided with a fourth connecting portion, the third connecting portion is used for connecting the inner driving shaft 230, and the fourth connecting portion is used for connecting the inner driven shaft 240. Thus, the outer sleeve 1 is connected with the outer driving shaft 210 and the outer driven shaft 220, the inner sleeve 2 is arranged in the accommodating cavity 1a and is connected with the inner driving shaft 230 and the inner driven shaft 240, so that the outer driving shaft 210 and the inner driving shaft 230 cannot interfere with each other during driving, the outer driven shaft 220 and the inner driven shaft 240 can rotate in the same direction correspondingly, and can also rotate in the opposite direction, and two shafts can be connected in a transmission manner. It can be understood that, in order to improve the transmission efficiency of the coupling 100, in the present embodiment, the inner sleeve 2 and the outer sleeve 1 are disposed to coincide with each other.

In order to facilitate the inner shaft sleeve 2 to connect the inner driving shaft 230 and the inner driven shaft 240, in this embodiment, the outer shaft sleeve 1 includes a first outer half shaft sleeve 11 and a second outer half shaft sleeve 13 that are sequentially connected along a transmission direction, the first outer half shaft sleeve 11 is provided with a first installation channel along an axial direction, the second outer half shaft sleeve 13 is provided with a second installation channel along an axial direction, the first installation channel is communicated with the second installation channel to form the accommodating cavity 1a, the first connection portion is provided on the first outer half shaft sleeve 11, and the second connection portion is provided on the second outer half shaft sleeve 13. Because the outer shaft sleeve 1 is designed in a split manner, the inner driving shaft 230 and the inner driven shaft 240 can be respectively connected through the third connecting part and the fourth connecting part, and then the inner shaft sleeve 2 is arranged in the accommodating cavity 1a formed by the first outer half shaft sleeve 11 and the second outer half shaft sleeve 13, so that the inner shaft sleeve 2 and the outer shaft sleeve 1 can be conveniently connected with the double driving shafts. The transmission direction refers to a direction from the driving shaft to the driven shaft.

Further, the first connecting portion includes a first outer gear sleeve 12, a first through hole penetrates through the first outer gear sleeve 12 in the axial direction, the first through hole is used for the outer spindle 210 to penetrate through, one end of the first outer gear sleeve 12 is arranged in the first installation channel, so that the first through hole is communicated with the first installation channel, an outer crown gear is arranged on the periphery of one end, located in the first installation channel, of the first outer gear sleeve 12, an inner crown gear meshed with the outer crown gear is arranged on the inner wall of the first installation channel, and the first outer gear sleeve 12 and the first outer half shaft sleeve 11 are in matched transmission with the inner crown gear through the outer crown gear; the second connecting portion comprises a second outer gear sleeve 14, a second through hole penetrates through the second outer gear sleeve 14 in the axial direction, the second through hole is used for allowing the outer driven shaft 220 to penetrate through, one end of the second outer gear sleeve 14 is arranged in the second installation channel, so that the second through hole is communicated with the second installation channel, outer crowned teeth are arranged on the periphery of one end, located at the second installation channel, of the second outer gear sleeve 14, inner drum-shaped teeth meshed and matched with the outer crowned teeth are arranged on the inner wall of the second installation channel, and the second outer gear sleeve 14 and the second outer half shaft sleeve 13 are in matched transmission with the inner drum-shaped teeth through the outer drum-shaped teeth. That is, in the present embodiment, the outer driving shaft 210 and the outer driven shaft 220 are connected to the second outer sleeve gear 14 through the first outer sleeve gear 12, and the first outer sleeve gear 12 and the second outer sleeve gear 14 are connected to the first outer half sleeve 11 and the second outer half sleeve gear 13 through crown teeth. The crowned teeth are used for transmitting torque and rotary motion, so that the bearing capacity is higher, and the angular displacement compensation is larger; the drum-shaped tooth surface improves the contact condition of the inner tooth and the outer tooth, avoids stress concentration caused by extrusion of the edge of the end of the straight tooth when angular displacement occurs, reduces noise and prolongs the maintenance period.

The connection form between the first outer gear sleeve 12 and the second outer gear sleeve 14 and the outer driving shaft 210 and the outer driven shaft 220 is not limited, and key grooves may be correspondingly formed in the gear sleeves and the shafts to perform connection transmission through flat keys or splines, step surfaces may be formed on the shafts to be abutted against the gear sleeves for limiting, or other forms may be used. In this embodiment, a first screw connection portion 121 is disposed at an end of the first outer sleeve gear 12 away from the first outer half sleeve 11, and the first screw connection portion 121 is configured to be screwed with a threaded hole disposed on the outer spindle 210; and a second screwed part is arranged at one end of the second outer gear sleeve 14 far away from the second outer half shaft sleeve 13 and is used for being in screwed connection with a threaded hole arranged on the outer driven shaft 220. Specifically, threaded holes may be formed in the gear sleeve and the shaft, and the threaded holes may be sequentially formed through the gear sleeve and the shaft by bolts to connect and fix the shaft and the gear sleeve for torque transmission. It is to be understood that the first thread connecting portion 121 may be provided in plurality at intervals in the radial direction of the first outer jacket 12.

Further, since the coupling 100 is a transmission device, lubrication with lubricant is required to maintain a good running state and reduce resistance. In the shaft coupling 100 of the present embodiment, the accommodating cavity 1a is filled with lubricating oil, so as to avoid the lubricating oil from overflowing, please refer to fig. 4, the shaft coupling 100 further includes a first end cap 15 and a second end cap 16; the first end cover 15 is annularly arranged and arranged on the periphery of the first outer gear sleeve 12, and the first end cover 15 is detachably mounted at one end, close to the first outer gear sleeve 12, of the first outer half shaft sleeve 11; the second end cap 16 is annularly disposed on the periphery of the second external gear sleeve 14, and the second end cap 16 is detachably mounted on one end of the second external half shaft sleeve 13 close to the second external gear sleeve 14. In this way, the lubricating oil in the accommodating chamber 1a is prevented from overflowing through the ports of the gear sleeve, which are provided with the first end cover 15 and the second end cover 16. In addition, the first end cap 15 and the second end cap 16 are detachably connected to the gear sleeve respectively, so as to facilitate maintenance and installation. In this embodiment, the first end cap 15 and the second end cap 16 are detachably connected to the gear sleeve through a screw connection portion.

In order to further improve the sealing performance of the accommodating cavity 1a, the inner circumferential wall of the first end cover 15 is recessed to form a first annular groove 15a, and a first sealing ring 151 is arranged in the first annular groove 15 a; the inner peripheral wall of the second end cap 16 is recessed to form a second annular groove, and a second sealing ring is arranged in the second annular groove. So set up, avoid lubricating oil to spill over from the clearance between end cover and the tooth cover for the lubricating oil in the chamber 1a is more difficult for spilling over the loss. It can be understood that the material of the sealing ring is not limited, and in this embodiment, the first sealing ring 151 and the second sealing ring are rubber pads or silicone pads. In addition, a third sealing ring 152 is also provided between the first end cap 15 and the first outer half shell 11, and a fourth sealing ring is also provided between the second end cap 16 and the second outer half shell 13. In this embodiment, the third sealing ring 152 and the fourth sealing ring are made of soft vulcanized fiber board.

Further, referring to fig. 5, in order to facilitate the butt-joint installation of the first outer half sleeve 11 and the second outer half sleeve 13, a third annular groove 12a is concavely provided on the end surface of the first outer half sleeve 11 facing the second outer half sleeve 13, the third annular groove 12a penetrates through the accommodating cavity 1a, and an annular protrusion 131 matched with the third annular groove 12a is convexly provided on the end surface of the second outer half sleeve 13 facing the first outer half sleeve 11. Thus, when the first outer half sleeve 11 and the second outer half sleeve 13 are connected, the first outer half sleeve 11 and the second outer half sleeve 13 can be centered by aligning and inserting the annular protrusion 131 into the third annular groove 12 a. It will be appreciated that a fourth annular groove 13a may be further provided outside the annular protrusion 131, and a seal ring may be provided in the fourth annular groove 13a to prevent the lubricant from overflowing from the third annular groove 12 a.

Further, the inner shaft sleeve 2 comprises a first inner half shaft sleeve 21 and a second inner half shaft sleeve 22 which are sequentially connected along the transmission direction, a third installation channel is arranged along the axial direction of the first inner half shaft sleeve 21, a fourth installation channel is arranged along the axial direction of the second inner half shaft sleeve 22, the third installation channel is communicated with the fourth installation channel, the third connection portion is arranged on the first inner half shaft sleeve 21, and the fourth connection portion is arranged on the second inner half shaft sleeve 22. Thus, the first inner half boss 21 and the second inner half boss 22 are respectively used for connecting with the inner driving shaft 230 and the inner driven shaft 240.

Specifically, the third connecting portion includes a third outer gear sleeve, a third through hole penetrates through the third outer gear sleeve in the axial direction, the third through hole is used for the inner spindle 230 to penetrate through, one end of the third outer gear sleeve is arranged in the third installation channel, so that the third through hole is communicated with the third installation channel, an outer crown gear is arranged on the periphery of one end, located in the third installation channel, of the third outer gear sleeve, inner drum-shaped teeth meshed with the outer crown gear are arranged on the inner wall of the third installation channel, and the third outer gear sleeve and the first inner half shaft sleeve 21 are in matched transmission with the inner drum-shaped teeth through the outer crown gear; the fourth connecting portion include the outer tooth cover of fourth, the outer tooth cover of fourth runs through along the axial and is equipped with the fourth through-hole, the fourth through-hole is used for supplying interior driven shaft 240 wears to establish, fourth outer tooth cover one end is located the fourth installation passageway, so that the fourth through-hole intercommunication the fourth installation passageway, the outer tooth cover of fourth is located the periphery of the one end of fourth installation passageway is equipped with outer crown gear, be equipped with on the inner wall of fourth installation passageway with outer crown gear meshing complex interior drum-shaped tooth, the outer tooth cover of fourth with half axle sleeve 22 passes through in the second outer crown gear with interior crown gear cooperation transmission. Thereby leading the inner shaft sleeve 2 to have higher bearing capacity and larger angular displacement compensation; the contact condition of the inner teeth and the outer teeth is improved, stress concentration caused by extrusion of edges of the end of the straight teeth in angular displacement is avoided, noise is reduced, and the maintenance period is prolonged.

The above is only the optional embodiment of the present invention, and not the scope of the present invention is limited thereby, all the equivalent structure changes made by the contents of the specification and the drawings are utilized under the inventive concept of the present invention, or the direct/indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. The utility model provides a coupler for the transmission of two driving shafts and two driven shafts, two driving shafts include along interior outward in to the interior driving shaft and the outer driving shaft that the cover was established in proper order, two driven shafts include along interior outward in to the interior driven shaft and the outer driven shaft that the cover was established in proper order, its characterized in that, the coupler includes:

2. The coupling according to claim 1, wherein the outer sleeve comprises a first outer sleeve half and a second outer sleeve half sequentially connected in the transmission direction, the first outer sleeve half has a first mounting channel axially extending therethrough, the second outer sleeve half has a second mounting channel axially extending therethrough, the first mounting channel communicates with the second mounting channel to form the receiving chamber, the first connecting portion is disposed on the first outer sleeve half, and the second connecting portion is disposed on the second outer sleeve half.

3. The coupling according to claim 2, wherein the first connecting portion comprises a first outer gear sleeve, a first through hole is formed in the first outer gear sleeve in an axial direction, the first through hole is used for the outer driving shaft to pass through, one end of the first outer gear sleeve is arranged in the first installation channel, so that the first through hole is communicated with the first installation channel, outer crown teeth are arranged on the periphery of one end, located in the first installation channel, of the first outer gear sleeve, inner crown teeth meshed with the outer crown teeth are arranged on the inner wall of the first installation channel, and the first outer gear sleeve and the first outer half shaft sleeve are in matched transmission with the inner crown teeth through the outer crown teeth;

4. The coupling of claim 3 wherein an end of said first outer sleeve facing away from said first outer sleeve half is provided with a first threaded connection for threaded connection with a threaded bore provided in said outer driveshaft;

5. The coupling of claim 3, further comprising:

6. The coupling of claim 5 wherein the inner peripheral wall of said first end cap is recessed to form a first annular groove, said first annular groove having a first seal ring disposed therein;

7. The coupling of claim 6 wherein a third seal ring is disposed between said first end cap and said first outer sleeve half and a fourth seal ring is disposed between said second end cap and said second outer sleeve half.

8. The coupling according to claim 2, wherein a third annular groove is concavely provided on the end surface of the first outer half collar facing the second outer half collar, the third annular groove penetrates through the receiving cavity, and an annular protrusion cooperating with the third annular groove is convexly provided on the end surface of the second outer half collar facing the first outer half collar.

9. The coupling according to any one of claims 1 to 8, wherein the inner sleeve comprises a first inner half sleeve and a second inner half sleeve which are sequentially connected in the transmission direction, a third installation channel axially penetrates through the first inner half sleeve, a fourth installation channel axially penetrates through the second inner half sleeve, the third installation channel is communicated with the fourth installation channel, the third connection portion is arranged on the first inner half sleeve, and the fourth connection portion is arranged on the second inner half sleeve.

10. The coupling according to claim 9, wherein the third connecting portion includes a third outer sleeve, a third through hole is axially formed through the third outer sleeve, the third through hole is used for the inner spindle to pass through, one end of the third outer sleeve is disposed in the third mounting channel, so that the third through hole is communicated with the third mounting channel, an outer crown gear is disposed on an outer periphery of one end of the third outer sleeve, an inner crown gear engaged with the outer crown gear is disposed on an inner wall of the third mounting channel, and the third outer sleeve and the first inner half sleeve are in transmission engagement with the inner crown gear through the outer crown gear;