CN111577775A

CN111577775A - Tooth type coupling

Info

Publication number: CN111577775A
Application number: CN202010323204.4A
Authority: CN
Inventors: 牟海波; 叶宝飞
Original assignee: Yueqing Chongxin Machinery Manufacturing Co ltd
Current assignee: Yueqing Chongxin Machinery Manufacturing Co ltd
Priority date: 2020-04-22
Filing date: 2020-04-22
Publication date: 2020-08-25
Anticipated expiration: 2040-04-22
Also published as: CN111577775B

Abstract

The invention relates to the technical field of couplings, and discloses a gear coupling which comprises a driving sleeve and two half coupling sleeves, wherein first driving teeth extending along the length direction of the driving sleeve are integrally formed on the circumferential outer wall of each half coupling sleeve; the close one end of circumference outer wall of two half shaft sleeves all is fixed with a plurality of locating pieces, is equipped with the through-hole that can supply each locating piece to wear out respectively on the drive cover, and arbitrary two locating pieces that highly equal all pass through multiunit fastener connection, and the fastener is equipped with the oil guide hole group including wearing to establish the fastening screw in the locating piece that two highly equal simultaneously and difference threaded connection at the fastening nut at fastening screw both ends on the drive cover. The invention has adjustable length and wide applicable space range.

Description

Tooth type coupling

Technical Field

The invention relates to the technical field of couplings, in particular to a tooth type coupling.

Background

The coupler is a mechanical part which is mainly used for connecting a driving shaft and a driven shaft in different mechanisms to enable the driving shaft and the driven shaft to rotate together to transmit torque, is an important component of a mechanical transmission system, and is widely applied to the fields of general machinery, metallurgical equipment, chemical machinery, aviation, ships, electronic equipment and the like.

In the prior art, chinese patent No. CN207178505U discloses a pin coupling, which includes two half coupling sleeves composed of a sleeve and connection plates at the ends of the sleeve, pin holes are provided in both the connection plates, a pin is connected in series in each pin hole, and inner annular grooves are provided on the outer end faces of both the connection plates; the two cover plates are respectively arranged on the outer end faces of the two connecting discs, annular protrusions are arranged on the inner end faces of the two cover plates, clamping grooves are formed in the root portions of the shaft sleeves, and the two cover plates are fixedly clamped through the retaining rings after being positioned and arranged on the outer end faces of the two connecting discs through the annular protrusions.

The above prior art solutions have the following drawbacks: because the length of the two half coupling sleeves is fixed, the length of the coupling formed after the two half coupling sleeves are assembled in place is fixed, and the lengths of the driving shaft and the driven shaft connected to the two sides of the coupling are fixed, the coupling can only be applied to a space with the length smaller than the sum of the lengths of the coupling and the driving shaft and the driven shaft connected to the two sides of the coupling, and cannot be applied when the length of the installation space is slightly larger than the sum of the lengths of the coupling and the driving shaft and the driven shaft connected to the two sides of the coupling, the applicable space range is.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a tooth type coupling, which is adjustable in length and has the effect of wide applicable space range.

The above object of the present invention is achieved by the following technical solutions: a kind of gear coupling, including two half coupling sleeves and connect the drive sleeve in two half coupling sleeves close one end outside, there is first drive tooth that extends along its length direction on the peripheral outer wall of the said half coupling sleeve integrally, there is second drive tooth that extends along its length direction on the peripheral inner wall of the said drive sleeve integrally, the said second drive tooth meshes with first drive tooth on two half coupling sleeves at the same time; the driving sleeve is provided with through holes which extend along the horizontal direction and can be penetrated out by the positioning blocks respectively, any two positioning blocks with the same height are connected through a plurality of groups of fasteners, and each fastener comprises a fastening screw rod which is simultaneously penetrated in the two positioning blocks with the same height and fastening nuts which are respectively in threaded connection with the two ends of the fastening screw rod; and the driving sleeve is provided with an oil guide hole group for lubricating oil to flow into the meshing part of the first transmission gear and the second transmission gear.

Through adopting above-mentioned technical scheme, during the assembly shaft coupling, two semi-coupling axle sleeves stretch into from the both sides opening of drive sleeve respectively for first driving tooth and the meshing of second driving tooth, locating piece stretch into and can slide along the through-hole along the opening of through-hole, pass two locating pieces that highly equals simultaneously with fastening screw, then with two fastening nut difference threaded connection at fastening screw's both ends in order to restrict two semi-coupling axle sleeve relative motion. When the coupler works, the driving shaft assembled on one of the semi-coupling shaft sleeves drives the semi-coupling shaft sleeve connected with the driving shaft to rotate, the first transmission gear drives the second transmission gear and the driving sleeve to rotate along with the first transmission gear, and then the other semi-coupling shaft sleeve drives the driven shaft connected with the driving sleeve to rotate. People can change the length of the two half coupling shaft sleeves extending into the driving sleeve so as to change the overall length of the coupler, so that the coupler can be suitable for an environment with the length slightly smaller than the sum of the length of the coupler and the lengths of the driving shaft and the driven shaft, and the application range is wide; the first transmission gear and the second transmission gear are always in a meshed state, the contact area is large, the borne torque force is large, and the coupler works stably. The oil guide hole group can be used for guiding lubricating oil to the meshing position of the first transmission gear and the second transmission gear, and the first transmission gear and the second transmission gear are prevented from rusting and being locked.

The invention is further configured to: the middle part of the positioning block is provided with a positioning hole which extends along the horizontal direction and through which the fastening screw rod can penetrate, one side of any two positioning blocks with the same height, which is opposite to each other, is integrally formed with an extension ring concentric with the positioning hole, and the inner diameter of the extension ring is equal to that of the positioning hole.

Through adopting above-mentioned technical scheme, the extension ring has increased the area of contact of fastening screw and locating piece for fastening screw is difficult for separating with the locating piece.

The invention is further configured to: and an internal thread in threaded fit with the fastening screw is arranged in the positioning hole of the positioning block connected to one of the half coupling sleeves.

Through adopting above-mentioned technical scheme, fastening nut pine takes off the back, and the internal thread still cooperates and can restrict fastening screw and locating piece separation with fastening screw, has improved fastening screw's stability.

The invention is further configured to: all be equipped with a positioning spring between arbitrary two highly equal locating pieces, the connection can be dismantled respectively in two close one sides of locating piece in positioning spring's both ends, the positioning spring cover is established in fastening screw's the outside and can drive two locating pieces and move in opposite directions.

Through adopting above-mentioned technical scheme, when accomodating the shaft coupling, two locating pieces that highly equals receive rather than the positioning spring effect of being connected can the motion in opposite directions for the length increase that two half coupling axle sleeves stretched into the drive sleeve, the whole length of shaft coupling reduces, occupation space is little. The fastening screw rod is positioned on the inner side of the positioning spring and can limit the torsion of the positioning spring, so that the service life of the positioning spring is prolonged.

The invention is further configured to: lead the oil drain hole group including set up a plurality of oil filler points on drive cover circumference lateral wall, with the ring channel of the other end simultaneous intercommunication of each oil filler point and locate a plurality of oil outlets on the ring channel inner wall along circumference, the other end of each oil outlet communicates with the meshing position of each first driving tooth and second driving tooth respectively, the oil outlet is kept away from the opening of ring channel and is close to the tip of drive cover.

Through adopting above-mentioned technical scheme, lubricating oil can follow the oil filler point and pour into, flow to the ring channel after derive from the oil outlet to the meshing position of first driving tooth and second driving tooth, the part of lubricating oil wide, lubricated effectual.

The invention is further configured to: an oil leakage hole is formed between any two adjacent first transmission teeth on the same half coupling sleeve, an annular oil collecting groove which is communicated with the oil leakage holes simultaneously is formed in the half coupling sleeve, and an oil pumping hole communicated with the outer wall of the half coupling sleeve is formed in the inner wall of the oil collecting groove.

By adopting the technical scheme, when the injected lubricating oil is excessive, part of the redundant lubricating oil can flow to the oil collecting tank through the oil leakage hole to be collected, and then is pumped out and recovered through the oil pumping tool extending into the oil pumping hole.

The invention is further configured to: elastic rings are fixed at the openings of the oil pumping hole and the oil filling hole, and a through hole is formed in the middle of each elastic ring.

By adopting the technical scheme, the openings of the oil pumping hole and the oil filling hole are reduced by the elastic ring, so that dust is not easy to enter the oil pumping hole and the oil filling hole to block the oil pumping hole and the oil filling hole; when oil is pumped or injected, people can stretch an oil pumping or injecting tool into the through hole, so that the elastic ring deforms and the inner diameter of the through hole is increased, and the oil pumping or injecting operation is facilitated.

The invention is further configured to: the end surfaces of the two half coupling shaft sleeves which are close to each other are respectively provided with an inserted bar and a slot which are matched with each other, and the end part of the inserted bar is inserted into the slot which is close to the inserted bar.

Through adopting above-mentioned technical scheme, inserted bar and slot cooperation play the effect of connecting two half coupling sleeves for two half coupling sleeves are difficult for relative rotation, have further improved the transmission performance of shaft coupling.

The invention is further configured to: one end of the inserted bar close to the half coupling shaft sleeve close to the inserted bar is connected with a spare gear block meshed with the second transmission gear on the driving sleeve.

Through adopting above-mentioned technical scheme, reserve tooth piece has further increased the area of meshing of half coupling axle sleeve and drive sleeve, and transmission effect is good.

The invention is further configured to: the end face, close to the driving sleeve, of the inserted rod is provided with a yielding groove, a yielding spring is fixed on the inner wall, far away from the driving sleeve, of the yielding groove, and the other end of the yielding spring is fixedly connected with the standby tooth block; the spare tooth block is close to the terminal surface of slot and keeps away from the junction of letting the spring terminal surface and is equipped with the direction inclined plane.

Through adopting above-mentioned technical scheme, when two shaft coupling sleeves move in opposite directions, the direction inclined plane can with be provided with the shaft coupling sleeve contact of slot for reserve dog-bone is accomodate to the groove of stepping down, avoids reserve dog-bone to influence the butt of two shaft coupling sleeves because of protrusion in the inserted bar, has enlarged the length control scope of shaft coupling. In addition, the yielding spring has acting force towards the direction of the driving sleeve to the standby tooth block, so that the standby tooth block abuts against the inner wall of the slot and the two half-coupling shaft sleeves are not prone to moving backwards.

In summary, the invention includes at least one of the following beneficial technical effects:

1. when the coupler is assembled, the two half-coupling shaft sleeves respectively extend into the two openings of the driving sleeve, so that the first transmission teeth and the second transmission teeth are meshed, and the positioning block penetrates out of the through hole; after the semi-coupling shaft sleeve is adjusted in place, the two positioning blocks with the same height are connected through a fastener, so that the relative movement of the two semi-coupling shaft sleeves is limited;

2. lubricating oil can be guided into the annular groove by the oil injection hole and then flows to the meshing part of the first transmission gear and the second transmission gear through the oil outlet hole, so that the first transmission gear and the second transmission gear are prevented from rusting and being stuck; the redundant part of lubricating oil can flow into the oil collecting tank through the oil leakage hole and is pumped out and recycled through the oil pumping hole;

3. the connecting area of the two semi-coupling shaft sleeves is increased by the matching of the inserted rod and the slot, the transmission effect is good, and the meshing area of one semi-coupling shaft sleeve and the driving sleeve is increased by the meshing of the standby tooth block and the second transmission gear; the groove of stepping down can be used for accomodating reserve tooth piece, has further enlarged the length adjustment scope of shaft coupling.

Drawings

FIG. 1 is a schematic structural view of the present embodiment;

FIG. 2 is a partial cross-sectional view of the positioning hole of the present embodiment;

FIG. 3 is a schematic sectional view highlighting the spare tooth mass of the present embodiment;

fig. 4 is an enlarged schematic view at a in fig. 3.

Reference numerals: 1. a drive sleeve; 11. a second gear; 12. a through hole; 2. a half coupling sleeve; 21. a first drive tooth; 22. positioning blocks; 221. positioning holes; 222. an extension ring; 23. inserting a rod; 231. a yielding groove; 232. a yielding spring; 233. a spare tooth block; 234. a guide slope; 24. a slot; 25. an oil leak hole; 26. an oil sump; 27. an oil pumping hole; 3. a fastener; 31. fastening a screw rod; 32. fastening a nut; 4. a positioning spring; 5. oil guide hole groups; 51. an oil filler hole; 52. an annular groove; 53. an oil outlet hole; 6. an elastic ring; 61. a through hole.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The embodiment discloses a gear coupling, as shown in fig. 1 and 2, the gear coupling comprises a driving sleeve 1 and two half coupling shaft sleeves 2, the driving sleeve 1 and the half coupling shaft sleeves 2 are both made of metal materials, the structural strength is high, and the driving sleeve 1 is connected to the outer side of one end, close to the two half coupling shaft sleeves 2. A first transmission tooth 21 extending along the length direction is integrally formed on the circumferential outer wall of the semi-coupling shaft sleeve 2, the length of the first transmission tooth 21 is equal to the length of the semi-coupling shaft sleeve 2, and the edges of the first transmission tooth and the first transmission tooth are aligned; the inner wall of the circumference of the driving sleeve 1 is integrally formed with a second transmission gear 11 extending along the length direction of the driving sleeve, the length of the second transmission gear 11 is equal to the length of the driving sleeve 1, the edges of the second transmission gear and the driving sleeve are aligned, and the first transmission gear 21 is respectively meshed between two adjacent second transmission gears 11. When the coupler is assembled, people can change the whole length of the coupler by changing the meshing length of the first transmission teeth 21 and the second transmission teeth 11, and the application range is wide.

As shown in fig. 1 and 2, a plurality of positioning blocks 22 are fixed at one end of each of the two half coupling sleeves 2 close to the circumferential outer wall, a plurality of through holes 12 extending in the horizontal direction are respectively formed at two ends of the driving sleeve 1, each positioning block 22 penetrates out of the through hole 12 close to the positioning block 22, and any two adjacent positioning blocks 22 in the horizontal direction are equal in height and are connected through two sets of fasteners 3.

As shown in fig. 2 and 3, two positioning holes 221 extending in the horizontal direction are formed in the middle of the positioning block 22, and an internal thread is formed in the positioning hole 221 of the positioning block 22 connected to one of the half coupling sleeves 2. The fastening pieces 3 comprise fastening screws 31 arranged in the positioning holes 221 in a penetrating mode and fastening nuts 32 in threaded connection with two ends of the fastening screws 31 and are used for connecting two groups of fastening pieces 3 of the positioning blocks 22 with the same height, the two fastening nuts 32 on one group of fastening pieces 3 are located on one sides, far away from each other, of the two positioning blocks 22, the two fastening nuts 32 on the other group of fastening pieces 3 are abutted to one sides, close to each other, of the two positioning blocks 22, the fastening pieces 3 can be used for limiting the two positioning blocks 22 to move towards and away from each other, and the connecting strength of the two half coupling sleeves 2 is high.

As shown in fig. 2 and 3, an extension ring 222 is integrally formed on each of two positioning blocks 22 with the same height, and the extension ring 222 is concentric with the positioning hole 221 and has an inner diameter equal to the inner diameter of the positioning hole 221. The extension ring 222 increases the connection area of the fastening screw 31 and the positioning block 22, and improves the stability of the fastening screw 31.

As shown in fig. 1 and 2, a positioning spring 4 is detachably connected between any two positioning blocks 22 with equal height, the positioning spring 4 is in a stretching state, and two ends of the positioning spring 4 are respectively hooked on the two positioning blocks 22, and the positioning spring 4 is sleeved on the outer side of the fastening screw 31 and used for driving the two positioning blocks 22 connected with the fastening screw to move in opposite directions, so that the two half coupling shaft sleeves 2 are not easy to separate.

As shown in fig. 2 and 3, a plurality of insertion rods 23 are fixed to an end surface of one of the half coupling sleeves 2 close to the other half coupling sleeve 2, a plurality of insertion grooves 24 are formed in an end surface of the other half coupling sleeve 2 close to the half coupling sleeve 2, the insertion rods 23 and the insertion grooves 24 extend in the horizontal direction, are equal in number and correspond in position, the depth of the insertion grooves 24 is greater than the length of the insertion rods 23, and the end portions of the insertion rods 23 are inserted into the insertion grooves 24 close to the insertion rods 23. The insertion rod 23 and the slot 24 are matched to increase the connecting area of the two half coupling sleeves 2, and further improve the connecting strength of the two half coupling sleeves and the transmission performance of the coupler.

As shown in fig. 3 and 4, the end surface of the inserted link 23 close to the driving sleeve 1 is provided with a yielding groove 231, the inner wall of the yielding groove 231 away from the driving sleeve 1 is fixed with a yielding spring 232, the other end of the yielding spring 232 is fixed with a spare tooth block 233, the spare tooth block 233 is meshed with the second transmission gear 11 on the driving sleeve 1, and the connecting area of the semi-coupling sleeve 2 and the driving sleeve 1 is further increased. The spare tooth piece 233 is close to the terminal surface of slot 24 and is kept away from the junction of the spring 232 terminal surface of stepping down and is equipped with direction inclined plane 234, and when two shaft coupling halves 2 move in opposite directions, can make spare tooth piece 233 accomodate gradually in the groove 231 of stepping down after direction inclined plane 234 and the upside inner wall butt of slot 24, and the length control range of shaft coupling is big.

As shown in fig. 1 and 3, the driving sleeve 1 is provided with an oil hole group 5, the oil hole group 5 includes a plurality of oil injection holes 51 circumferentially arranged on the outer wall of the circumference of the driving sleeve 1, an annular groove 52 simultaneously communicated with the other end of each oil injection hole 51, and a plurality of oil outlet holes 53 arranged on the inner wall of the annular groove 52, one end of each oil outlet hole 53 far from the annular groove 52 is respectively communicated with the meshing part of each first transmission tooth 21 and each second transmission tooth 11, and the opening of the oil outlet hole 53 far from the annular groove 52 is close to the two ends of the driving sleeve 1. Lubricating oil can flow into annular groove 52 through oil filler point 51, and the rethread oil outlet 53 flows to the meshing position of first driving tooth 21 and second driving tooth 11, plays lubricated effect, avoids first driving tooth 21 and the rust of second driving tooth 11 to block.

As shown in fig. 1 and 2, an oil leakage hole 25 formed in the semi-coupling sleeve 2 is formed between any two adjacent first transmission teeth 21, an oil collecting groove 26 simultaneously communicated with each oil leakage hole 25 is formed in the semi-coupling sleeve 2, the oil collecting groove 26 is annular, an oil pumping hole 27 is formed in the inner wall of the oil collecting groove 26, and the oil pumping hole 27 is communicated with the end faces of the two semi-coupling sleeves 2, which are opposite to each other. Part of the excessive lubricating oil can enter the oil collecting groove 26 from the oil leakage hole 25 to be collected and then be pumped out and recovered by the oil pumping tool through the oil pumping hole 27.

As shown in fig. 1 and 2, the oil pumping hole 27 and the oil pumping hole 51 are fixed at their openings with an elastic ring 6 made of elastic material, the elastic ring 6 is provided at its middle with a through hole 61, the through hole 61 is used for penetration of oil injection and oil pumping tools, the through hole 61 has a small inner diameter in a natural state, the elastic ring 6 can prevent dust from entering the oil pumping hole 51 or the oil pumping hole 27, and the dust-proof effect is good. When the hole is pumped or the oil is pumped, the elastic ring 6 can deform when an oil injection tool or an oil pumping tool penetrates due to the elasticity of the elastic ring, so that the inner diameter of the through hole 61 is increased to facilitate the oil injection and oil pumping operation.

The implementation principle of the embodiment is as follows: when the coupler is assembled, the two half coupling shaft sleeves 2 respectively extend into the two side openings of the driving sleeve 1, so that the inserted rods 23 respectively extend into the slots 24, the first transmission teeth 21 and the second transmission teeth 11 are engaged, the positioning blocks 22 penetrate through the through holes 12, the fastening screw 31 penetrates through the two positioning blocks 22 with equal height, and the two fastening nuts 32 are respectively in threaded connection with the two ends of the fastening screw 31; two fastening nuts 32 in one group of fastening pieces 3 abut against one side of two positioning blocks 22, and two fastening nuts 32 in the other group of fastening pieces 3 are located on the opposite side of the two positioning blocks 22 and used for limiting the relative movement of the two half coupling sleeves 2. People's accessible changes the meshing length of first driving tooth 21 and second driving tooth 11 on two half shaft sleeves 2, and then changes the length of shaft coupling, and the installation environment scope that is suitable for is big.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the design concept of the present invention should be included in the scope of the present invention.

Claims

1. The utility model provides a tooth-like shaft coupling, includes two shaft sleeve (2) and connects drive cover (1) in the one end outside that two shaft sleeve (2) are close, its characterized in that ally oneself with: first transmission teeth (21) extending along the length direction of the semi-coupling shaft sleeve are integrally formed on the circumferential outer wall of the semi-coupling shaft sleeve (2), second transmission teeth (11) extending along the length direction of the semi-coupling shaft sleeve are integrally formed on the circumferential inner wall of the driving sleeve (1), and the second transmission teeth (11) are meshed with the first transmission teeth (21) on the two semi-coupling shaft sleeves (2) simultaneously; a plurality of positioning blocks (22) are fixed at one ends close to the circumferential outer walls of the two half coupling shaft sleeves (2), through holes (12) which extend in the horizontal direction and can be respectively penetrated by the positioning blocks (22) are formed in the driving sleeve (1), any two positioning blocks (22) with the same height are connected through a plurality of groups of fasteners (3), and each fastener (3) comprises a fastening screw rod (31) which is simultaneously penetrated in the two positioning blocks (22) with the same height and fastening nuts (32) which are respectively in threaded connection with the two ends of the fastening screw rod (31); and the driving sleeve (1) is provided with an oil guide hole group (5) for lubricating oil to flow into the meshing part of the first transmission gear (21) and the second transmission gear (11).

2. A tooth coupling according to claim 1, characterized in that: the middle part of the positioning block (22) is provided with a positioning hole (221) which extends along the horizontal direction and through which the fastening screw rod (31) can penetrate, one side of any two positioning blocks (22) with the same height, which is opposite to each other, is integrally formed with an extension ring (222) which is concentric with the positioning hole (221), and the inner diameter of the extension ring (222) is equal to the inner diameter of the positioning hole (221).

3. A tooth coupling according to claim 2, characterized in that: an internal thread which is in threaded fit with the fastening screw rod (31) is arranged in a positioning hole (221) of a positioning block (22) connected to one of the semi-coupling shaft sleeves (2).

4. A tooth coupling according to claim 1, characterized in that: all be equipped with a positioning spring (4) between arbitrary two highly equal locating pieces (22), the connection can be dismantled respectively in two close one sides of locating piece (22) in the both ends of positioning spring (4), positioning spring (4) cover is established in the outside of fastening screw (31) and can drive two locating pieces (22) and move in opposite directions.

5. A tooth coupling according to claim 1, characterized in that: lead oil hole group (5) including set up a plurality of oil filler point (51) on drive sleeve (1) circumference lateral wall along circumference, ring channel (52) that communicate simultaneously with the other end of each oil filler point (51) and locate a plurality of oil outlet (53) on ring channel (52) inner wall, the other end of each oil outlet (53) communicates with the meshing position of each first driving tooth (21) and second driving tooth (11) respectively, the opening that ring channel (52) were kept away from in oil outlet (53) is close to the tip of drive sleeve (1).

6. A tooth coupling according to claim 5, characterized in that: all be equipped with an oil leak hole (25) between two arbitrary adjacent first transmission tooth (21) on same half shaft coupling (2), be equipped with in half shaft coupling (2) and communicate simultaneously and be annular oil collecting tank (26) with each oil leak hole (25), be equipped with on the inner wall of oil collecting tank (26) one with the oil pumping hole (27) of the outer wall intercommunication of half shaft coupling (2).

7. A tooth coupling according to claim 6, characterized in that: elastic rings (6) are fixed at openings of the oil pumping hole (27) and the oil filling hole (51), and through holes (61) are formed in the middle of each elastic ring (6).

8. A tooth coupling according to claim 1, characterized in that: the end surfaces of the two half coupling shaft sleeves (2) which are close to each other are respectively provided with an inserted rod (23) and a slot (24) which are matched with each other, and the end part of the inserted rod (23) is inserted into the slot (24) which is close to the inserted rod.

9. A tooth coupling according to claim 8, characterized in that: one end of the inserted bar (23) close to the half coupling shaft sleeve (2) close to the inserted bar is connected with a spare gear block (233) meshed with the second transmission gear (11) on the driving sleeve (1).

10. A tooth coupling according to claim 9, characterized in that: the end face, close to the driving sleeve (1), of the inserted rod (23) is provided with a yielding groove (231), the inner wall, far away from the driving sleeve (1), of the yielding groove (231) is fixedly provided with a yielding spring (232), and the other end of the yielding spring (232) is fixedly connected with the spare tooth block (233); the spare tooth block (233) is provided with a guide inclined plane (234) at the joint of the end surface close to the slot (24) and the end surface far away from the abdicating spring (232).