CN212429644U

CN212429644U - Transmission structure

Info

Publication number: CN212429644U
Application number: CN202021865528.2U
Authority: CN
Inventors: 熊宏佳; 熊俞智
Original assignee: Foshan V Plus Machinery Co ltd
Current assignee: Foshan V Plus Machinery Co ltd
Priority date: 2020-08-31
Filing date: 2020-08-31
Publication date: 2021-01-29
Anticipated expiration: 2030-08-31

Abstract

The utility model discloses a transmission structure, which comprises an input module, a speed change module and an output module, wherein the speed change module comprises a first gear, a sliding guide sleeve, a gear shift mechanism and a second gear, the first gear is sleeved on an input shaft, and the second gear is sleeved on an output shaft; the speed change module further comprises a third gear, a fourth gear and a driven shaft, the third gear is meshed with the first gear, the fourth gear is meshed with the second gear, the sliding guide sleeve is sleeved to the output shaft and is provided with an annular groove, a first transmission groove and a second transmission groove are respectively formed in the end face of the sliding guide sleeve, the gear shifting mechanism is clamped to the annular groove, the first gear is provided with a first transmission piece, the second gear is provided with a second transmission piece, and the sliding guide sleeve is connected with the first gear through the first transmission piece nested in the first transmission groove or connected with the second gear through the second transmission piece nested in the second transmission groove. The utility model discloses a derailleur compact structure is simple, and is with low costs, shifts smoothly and the variable speed is convenient and reliable, has avoided bumping the problem that the tooth collapses the tooth even simultaneously.

Description

Transmission structure

Technical Field

The utility model relates to a transmission technical field, more specifically relates to a derailleur structure.

Background

The gears that ordinary feeder can generally provide are limited, lead to the speed section that can provide less, receive in feeder use and wood working process under the influence of different multifactorial factors such as timber material, thickness, required processing shape, cutter depth of cut, the user can't the required speed section of accurate acquisition, consequently can't satisfy the required more meticulous speed requirement of processing. At present, users in the market select a feeder with variable frequency and adjustable speed, the feeder can realize stepless speed change in a selected interval range, and the requirement of the users on more precise speed is met, but the feeder is higher in cost, so that the market coverage rate is smaller, and the number of the selected users is small.

Therefore, with the processing requirement, a transmission structure capable of being matched with a feeder appears on the market, but the general transmission structure adopts a multi-stage gear set for speed change, so that the transmission structure is complex, the occupied space is large, and the transmission structure is not suitable for being matched with a feeder with small volume. In order to provide a speed change function and save space, for example, a variable ratio coaxial transmission structure is described in patent CN1369656A published in 2002, 9, 18 and provides two selectable speed gears by matching an external gear moving coaxially with two speed change gears, so that the transmission structure can additionally provide one more speed stage when used with a feeder on the basis of keeping all speed stages of the existing common feeder, further refine the segmentation of the feeding speed, meet the fine requirements of most users on the speed stages, and is convenient and fast in speed change, the speed change efficiency is further improved, and the cost is greatly reduced compared with that of the feeder using variable frequency speed regulation. However, the structure of the variable ratio coaxial transmission has the defects that the whole structure is large and bloated, the occupied space is large, and the problems of unsmooth engagement, tooth collision and even tooth breakage can easily occur in the speed change process due to the fact that the direct driving gear is meshed with or separated from the gear to switch the speed change.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a derailleur structure provides more accurate speed section position, and compact structure is simple, and is with low costs, and it is smooth-going and the variable speed of shifting is convenient and reliable, has avoided bumping the problem that the tooth collapses the tooth even simultaneously.

The utility model provides a technical problem adopt following technical scheme to realize: a transmission structure comprises an input module, a speed change module and an output module, wherein the input module comprises an input shaft, the output module comprises an output shaft, the speed change module comprises a first gear, a sliding guide sleeve, a gear shifting mechanism and a second gear which are sequentially arranged along the axial direction, the first gear is sleeved on the input shaft, and the second gear is sleeved on the output shaft and can rotate relative to the output shaft; speed change module still includes third gear, fourth gear and driven shaft, the third gear with the fourth gear cup joints to respectively the both ends of driven shaft, the third gear with first gear engagement, the fourth gear with second gear engagement, the driven shaft with the output shaft is parallel, but slip guide pin bushing axially sliding cup joints extremely the output shaft, the radial surface of slip guide pin bushing is provided with the annular and slip guide pin bushing is provided with first transmission groove and second transmission groove respectively along two axial terminal surfaces, the gearshift block extremely the annular, first gear is close to the terminal surface of output shaft is provided with first driving medium, the second gear is close to the terminal surface of input shaft is provided with the second driving medium, the slip guide pin bushing passes through first transmission groove is nested first driving medium with first gear hookup or through second transmission groove is nested the second driving medium with the second transmission groove is nested And (4) wheel coupling.

The utility model discloses an among the derailleur structure, first gear cup joints on the input shaft, and input module's input shaft drives first gear revolve, and therefore the rotational speed transmission of input shaft is for first gear. The third gear and the fourth gear are sleeved at two ends of the driven shaft, the first gear is meshed with the third gear, the first gear drives the third gear to rotate, and the number of teeth of the first gear and the number of teeth of the third gear can be unequal, so that speed change is realized. The third gear and the fourth gear rotate together and rotate at the same speed. The fourth gear is meshed with the second gear, the number of teeth of the second gear can be unequal to that of the fourth gear, so that the fourth gear drives the second gear to realize speed change again, the number of teeth of the second gear is unequal to that of the fourth gear when the number of teeth of the first gear is equal to that of the third gear, the number of teeth of the first gear is unequal to that of the third gear when the number of teeth of the second gear is equal to that of the fourth gear, the speed change ratio can be adjusted and selected by adjusting the number of teeth of each gear according to actual requirements, but the sum of the reference circle diameters of the third gear and the first gear is equal to the sum of the reference circle diameters of the fourth gear and the second gear. When the sliding guide sleeve axially slides to the position where the second transmission groove is nested in the second transmission piece, the second transmission piece drives the second transmission groove to rotate, the rotating speed of the second gear subjected to speed change is transmitted to the sliding guide sleeve, and the sliding guide sleeve is sleeved on the output shaft so that the rotating speed of the sliding guide sleeve is transmitted to the output shaft, and speed change output is achieved. After the gear shifting mechanism clamped on the ring groove of the sliding guide sleeve is pulled, the sliding guide sleeve axially slides along the output shaft, so that when the sliding guide sleeve axially slides to the position where the first transmission piece is embedded in the first transmission groove, the first transmission piece drives the first transmission groove to rotate, the rotating speed of the first gear is transmitted to the sliding guide sleeve, the rotating speed of the sliding guide sleeve is transmitted to the output shaft, the rotating speeds of the output shaft and the input shaft are the same, and constant-speed output is achieved. The transmission structure provides additional speed gears, namely provides more required speed stages, and can meet more accurate speed requirements. If more and more fine speed steps are needed, the selection can be adjusted by adjusting the tooth number of each gear according to actual requirements, and more speed steps are provided. This derailleur structure has still adopted the structure of coaxial variable speed and the variable speed that the driving medium drove simultaneously, the general very occupation space of meshing variable speed of gear train, simultaneously when shifting gear and gear engagement take place easily before bumping the tooth and collapse the problem of tooth, lead to the work piece to damage and the variable speed irregularity, because this derailleur structure does not need to alternate the gear train and shifts the variable speed, structurally saved the space, the structure is compacter and simpler, drive the variable speed through the driving medium simultaneously, the variable speed is convenient and reliable, avoid bumping the tooth and collapsing the problem of tooth, consequently shift and can smooth-going transition, and compare the low price with frequency conversion speed governing product.

In an embodiment, still include the casing, the speed change module with the output module is installed in the casing, the casing has seted up respectively along two axial terminal surfaces and is on a parallel with first support hole and the second support hole of sliding guide sleeve, gearshift includes support piece, sliding sleeve and shift fork, support piece's both ends fixed insertion first support hole with in the second support hole, the shift fork pass through but sliding sleeve axle sleeve ground cup joints to support piece is last and the block extremely the annular. Support piece fixes in the first supporting hole and the second supporting hole of casing, and the shift fork of shifting passes through the slip cap cover on support piece, and support piece provides radial support for the shift fork of shifting, and the annular of the fork end block slip guide pin bushing of shift fork can drive the slip guide pin bushing along output shaft axial slip. The shell protects the speed changing module and the output module from being polluted by the external working environment, and meanwhile, the workpiece can be prevented from being burst out under the condition that the speed changing structure is unexpected. Because support piece and first support hole and second support hole provide radial support, the shift fork can slide on support piece more steadily to drive the slip guide pin bushing and more steadily axial slip along the output shaft, because the variable speed of shifting needs the slip guide pin bushing to slide on the output shaft and with first driving medium and the hookup of second driving medium, because need accurate alignment, radial skew size needs very accurate, the radial support that support piece provided reduces the shift fork of shifting and is in radial skew, let the variable speed of shifting accurate alignment.

Preferably, the gear shifting mechanism further comprises a gear shifting shaft and a gear shifting knob, wherein an elongated slot is formed in one end, far away from the annular slot, of the gear shifting fork, a boss is arranged at one end, close to the supporting piece, of the gear shifting shaft, the gear shifting knob is arranged at the other end of the gear shifting shaft, and the boss is inserted into the elongated slot. The rotary shifting knob drives the boss to rotate, the inner side of the long groove is pushed by the boss to drive the long groove on the shifting fork to axially slide along the supporting piece, so that the shifting fork starts to axially slide, the shifting fork slides to drive the sliding guide sleeve to axially slide on the output shaft to be connected with the first transmission piece and the second transmission piece, shifting speed change is realized, the boss rotates to drive the shifting fork to axially slide, the sliding guide sleeve can slide according to a rotating track curve of the boss during shifting, shifting action is stable and smooth, and therefore shifting speed change is realized more stably and smoothly.

In one embodiment, the sliding guide sleeve is further provided with a spring plunger, the sliding guide sleeve is provided with a threaded hole, and the spring plunger penetrates through the threaded hole to press the output shaft. After the sliding guide sleeve slides to a certain position, the spring plunger presses the output shaft to be fixed. During the sliding and gear shifting process of the sliding guide sleeve, the spring plunger can compress the output shaft to realize the axial fixation of the sliding guide sleeve, the gear shifting fork does not bear the axial force of the sliding guide sleeve any more, the heating and the abrasion caused by the mutual friction between the sliding guide sleeve and the gear shifting fork are reduced, and the smoothness and the stability of the gear shifting speed change are ensured.

Still preferably, the radial outer surface of the output shaft is provided with a groove, and the spring plunger penetrates through the threaded hole and is clamped into the groove. According to the gear position needing speed change, a corresponding groove is arranged at the position of the corresponding output shaft, and the sliding guide sleeve is just clamped into the arranged groove when sliding to the required position. In the sliding and gear shifting process of the sliding guide sleeve, the spring plunger can be clamped into the groove to realize axial fixation of the sliding guide sleeve, the gear shifting fork does not bear axial force of the sliding guide sleeve any more, heating and abrasion caused by mutual friction between the sliding guide sleeve and the shifting fork are reduced, and smoothness and stability of gear shifting and speed changing are guaranteed.

In one embodiment, a first bearing is disposed between the third gear and the fourth gear and the driven shaft, and the third gear and the fourth gear are sleeved to the driven shaft through the first bearing. The third gear is connected with the driven shaft through the first bearing, and the fourth gear is connected with the driven shaft through the first bearing. The first bearing supports the radial load of the third gear and the fourth gear, and reduces the friction force between the third gear and the fourth gear and the driven shaft.

In one embodiment, the first gear is a boss gear, an inner groove is formed in a boss of the boss gear, a key is arranged on the radial outer surface of the input shaft, and the input shaft and the boss gear are connected with the inner groove through the key. The boss gear has been seted up the inside groove, and the inside groove is connected with the key-type, and the length of key-type connection can include the length of boss and gear. The length of the boss is lengthened by the length of the key connection, so that the effect of power transmission is better, the stress surface is increased, and the stress concentration is reduced.

In one embodiment, a second bearing is arranged between the first gear and the output shaft, a third bearing is arranged on the second gear, a fourth bearing, a fifth bearing and an oil protection ring are sequentially arranged on the output shaft along the axial direction, a spacer ring is abutted between the third bearing and the fourth bearing, and the fifth bearing and the oil protection ring are arranged on two sides of the shell, which are close to the end face of the output shaft. An oil protection ring is arranged between the outer side of the shell and the output shaft to prevent engine oil used for lubricating in a feeder matched with the speed change structure from leaking. The second bearing supports the first gear during transmission, a second transmission piece and a sliding guide sleeve on the second gear are in linkage transmission when the output shaft outputs in a variable speed mode, the second gear is supported by a third bearing between the transmission position and the shell, meanwhile, a fourth bearing and a fifth bearing are arranged between the other end of the output shaft and the shell, the second bearing and the third bearing can provide support at the transmission position, the fourth bearing and the fifth bearing provide support at the longer output end of the output shaft, and the spacer ring abuts against the third bearing and the fourth bearing to keep the specified axial distance between the two bearings.

In one embodiment, the number of the first transmission grooves and the second transmission grooves is four, the first transmission grooves and the second transmission grooves are arc grooves, the four first transmission grooves and the four second transmission grooves are quartered arc grooves distributed along the circumference of the second gear, the number of the first transmission members corresponds to that of the first transmission grooves, and the number of the second transmission members corresponds to that of the second transmission grooves. When the four first transmission grooves and the four second transmission grooves are arc grooves which are divided into four equal parts, power can be transmitted through the four first transmission grooves or the four second transmission grooves and the first transmission piece or the second transmission piece in a matching mode. The arrangement of the quartering arc groove can enable power transmission to be more balanced and stable, and meanwhile, the damage to the shaft piece caused by the radial load deflected to one side in the power transmission process is prevented. The first transmission piece corresponds to the number of the first transmission grooves and corresponds to the number of the second transmission pieces and the second transmission grooves, so that the torque can be better transmitted.

In one embodiment, the output shaft is a six-toothed splined shaft, and the sliding guide sleeve is a six-toothed splined sleeve, the six-toothed splined shaft being axially slidably keyed with the six-toothed splined sleeve. The six-tooth spline shaft is embedded with the six-tooth spline sleeve to transmit the power of the second gear to the output shaft. The six-tooth spline shaft and the six-tooth spline sleeve are embedded, so that the contact area can be increased, mechanical torque can be better transmitted, and better power transmission is realized.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses a derailleur structure provides more accurate speed section position, and compact structure is simple, and is with low costs, shifts smoothly and the variable speed is convenient and reliable, has avoided bumping the problem that the tooth collapses the tooth even simultaneously.

Drawings

FIG. 1 is a schematic view of the transmission structure assembled with a motor and feeder;

FIG. 2 is an exploded assembly schematic of the transmission module and output module of the transmission architecture;

FIG. 3 is an assembly schematic of the transmission module and the output module in a transmission configuration without a housing;

fig. 4 is a perspective view of a transmission structure with a housing.

The drawings are for illustrative purposes only and are not to be construed as limiting the invention; for a better understanding of the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent actual product dimensions; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

Detailed Description

The present invention will be further described with reference to the following detailed description and the accompanying drawings, which are not intended to limit the present invention in any way.

As shown in fig. 1, in the transmission structure 10 including an input module 40, a shift module 20 and an output module 30, the input module 40 is a motor in the present embodiment. As shown in fig. 2, the input module 40 includes an input shaft (not shown), the output module 30 includes an output shaft 301, and the transmission module 20 includes a first gear 201, a sliding guide 202, a shift mechanism 203, and a second gear 204, which are sequentially arranged along the axial direction. The first gear 201 is sleeved on the input shaft, the input shaft of the input module 40 drives the first gear 201 to rotate, and the rotating speed of the input shaft is transmitted to the first gear 201. The sliding guide sleeve 202 is sleeved on the output shaft 301 and can axially slide on the output shaft 301.

As shown in fig. 2, the sliding guide 202 is preferably a six-tooth spline sleeve, and six equally-divided key slots 2021 are formed in the sliding guide 202. The sliding guide 202 may also be any toothed spline sleeve, and a corresponding number of keyways 2021 are correspondingly formed in the sliding guide 202. The six equally-divided key slots 2021 are embedded with the six equally-divided keys 3011 on the output shaft 301 to realize key connection so as to transmit power, the output shaft 301 can be any toothed spline shaft, and the output shaft 301 is correspondingly provided with keys 3011 corresponding to the number of the key slots 2021. The sliding guide sleeve 202 and the output shaft 301 can also be common parts without a key groove and a key, and the sliding guide sleeve 202 is directly sleeved on the output shaft 301 and can axially slide along the output shaft 301.

As shown in fig. 2, 3 and 4, the radially outer surface of the slide guide 202 is provided with a ring groove 207 and both end surfaces are provided with four first transmission grooves 208 and four second transmission grooves 209, respectively. The four first transmission grooves 208 and the four second transmission grooves 209 are respectively quartered circular arc grooves distributed along the circumference in fig. 2, and the number of the first transmission grooves 208 and the second transmission grooves 209 can be selected according to the torque to be transmitted. The end face of the first gear 201 close to the output shaft 301 is provided with four first transmission pieces 210, the end face of the second gear 204 close to the input shaft is provided with four second transmission pieces 211, the gear shifting mechanism 203 is clamped to the ring groove 207, the number of the first transmission pieces 210 corresponds to the number of the first transmission grooves 208, and the number of the second transmission pieces 211 corresponds to the number of the second transmission grooves 209. The gear change module 20 further includes third and

fourth gears

2051, 2052 and a driven shaft 206, with the third and

fourth gears

2051, 2052 being sleeved on the driven shaft 206. The driven shaft 206 and the output shaft 301 are parallel. Third gear 2051 and fourth gear 2052 may be integrally formed, such as dual gears. Third gear 2051 and fourth gear 2052 rotate on driven shaft 206. First gear 201 and third gear 2051 mesh, and first gear 201 drives third gear 2051 and rotates, thereby the number of teeth of first gear 201 and the number of teeth of third gear 2051 can be unequal realization variable speed. Third gear 2051 and fourth gear 2052 rotate together and at the same speed. Fourth gear 2052 is meshed with second gear 204, the number of teeth of second gear 204 and the number of teeth of fourth gear 2052 may not be equal, so that fourth gear 2052 drives second gear 204 to realize speed change again, the number of teeth of second gear 204 is not equal to the number of teeth of fourth gear 2052 when the number of teeth of first gear 201 is equal to the number of teeth of third gear 2051, the number of teeth of first gear 201 is not equal to the number of teeth of third gear 2051 when the number of teeth of second gear 204 is equal to the number of teeth of fourth gear 2052, the speed change ratio may be adjusted and selected by adjusting the number of teeth of each gear according to actual requirements, but it must be ensured that the sum of the reference circle diameters of third gear 2051 and first gear 201 is equal to the sum of the reference circle diameters of fourth gear 2052 and second gear 204.

As shown in fig. 2, 3 and 4, the sliding guide 202 further has two symmetrical threaded holes 212, and two spring plungers 213 are mounted on the threaded holes 212. The number of threaded holes 212 and the number of spring plungers 213 can be selected and correspond to each other according to the volume and weight of the components to be carried.

As shown in fig. 2, 3 and 4, the first gear 201 is provided with an inner groove 214, and the inner groove 214 can be used for a key (not shown) on the input shaft to realize key connection and power transmission. The shift module 20 further includes two first bearings 215 disposed between the third gear 2051, the fourth gear 2052 and the driven shaft 206, a second bearing 216 disposed between the first gear 201 and the output shaft 301, and a third bearing 217 disposed between the second gear 204. The output shaft 301 is further provided with a fourth bearing 219, a fifth bearing 220 and an oil protection ring 302 in sequence along the axial direction, a spacer 218 is abutted between the third bearing 217 and the fourth bearing 219, and the fifth bearing 220 and the oil protection ring 302 are arranged on two sides of the end face of the shell 302.

As shown in fig. 2, 3 and 4, the shift mechanism 203 includes a shift fork 2031, a support member 223 having both ends fixed to the first support hole 221 and the second support hole 222 of the housing 302, respectively, and a shift shaft 225 mounted to the housing 302. The U-shaped opening of the shift fork 2031 is clamped on the ring groove 207 of the sliding guide sleeve 202, the sliding sleeve 224 fixed on the shift fork 2031 is sleeved on the support member 223, and the boss 226 of the shift shaft 225, the front end of which is eccentric with the center of the main body, is inserted in the elongated slot 227 at the rear end of the shift fork 2031. When the shift knob 228 drives the shift shaft 225 to rotate 180 degrees, the rotation of the boss 226 drives the long slot 227 of the shift fork 2031 to slide along the support 223, the shift fork 2031 therefore slides along the support 223, the support 223 is parallel to the input shaft, and the shift fork 2031 drives the sliding guide 202 to slide axially, thereby realizing speed change and gear shift. The support 223 provides additional radial support, and the shift fork 2031 can slide on the support 223 more smoothly, so as to drive the sliding guide sleeve 202 to slide axially on the output shaft 301 more stably, thereby achieving precise alignment of the radial deviation. The shift mechanism 203 may also be a conventional shift handle or any other shift mechanism. When the spring plunger 213 slides axially along the sliding guide sleeve 202 to complete gear shifting, the balls in the spring plunger 213 are clamped into the groove 229 or 230 formed in the output shaft 301 to lock the axial position of the sliding guide sleeve 202, when the spring plunger 213 is clamped into the groove 229, the first transmission piece 210 drives the first transmission groove 209 to rotate, the rotating speed of the first gear 201 is transmitted to the output shaft 301, the rotating speeds of the output shaft 301 and the input shaft are the same, and constant-speed output is achieved. When the spring plunger 213 is engaged in the groove 230, the second transmission member 211 drives the second transmission groove 209 to rotate, and the rotation speed of the second gear 204 is transmitted to the sliding guide sleeve 202, so that the rotation speed of the sliding guide sleeve 202 is transmitted to the output shaft 301, thereby realizing variable speed output. The spring plunger 213 can also be pressed directly against the output shaft 301 without the grooves 229 or 230 to achieve axial fixation.

As shown in fig. 1 and 4, the transmission structure 10 is integrally mounted within a housing 302 that protects the transmission module 20 and the output module 30 from contamination from the external operating environment while preventing accidental workpiece breakout of the transmission structure. As shown in fig. 1, the transmission architecture 10 may be used with an input module 40 and a feeder 50, accommodating various types of input modules 40 and feeders 50.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A transmission structure comprises an input module, a speed change module and an output module, wherein the input module comprises an input shaft, and the output module comprises an output shaft; speed change module still includes third gear, fourth gear and driven shaft, the third gear with the fourth gear cup joints to respectively the both ends of driven shaft, the third gear with first gear engagement, the fourth gear with second gear engagement, the driven shaft with the output shaft is parallel, but slip guide pin bushing axially sliding cup joints extremely the output shaft, the radial surface of slip guide pin bushing is provided with the annular and slip guide pin bushing is provided with first transmission groove and second transmission groove respectively along two axial terminal surfaces, the gearshift block extremely the annular, first gear is close to the terminal surface of output shaft is provided with first driving medium, the second gear is close to the terminal surface of input shaft is provided with the second driving medium, the slip guide pin bushing passes through first transmission groove is nested first driving medium with first gear hookup or through second transmission groove is nested the second driving medium with the second transmission groove is nested And (4) wheel coupling.

2. The transmission structure according to claim 1, further comprising a housing, wherein the transmission module and the output module are mounted in the housing, a first support hole and a second support hole parallel to the sliding guide sleeve are respectively formed in two axial end surfaces of the housing, the shifting mechanism comprises a support member, a sliding sleeve and a shifting fork, two ends of the support member are fixedly inserted into the first support hole and the second support hole, and the shifting fork is axially slidably sleeved on the support member through the sliding sleeve and is clamped to the annular groove.

3. The transmission structure of claim 2, wherein the gearshift mechanism further comprises a shift shaft and a shift knob, an elongated slot is formed in one end of the shift fork away from the annular slot, a boss is arranged at one end of the shift shaft close to the support member, the shift knob is arranged at the other end of the shift shaft, and the boss is inserted into the elongated slot.

4. The transmission structure according to claim 1, wherein the sliding guide sleeve is further provided with a spring plunger, the sliding guide sleeve is provided with a threaded hole, and the spring plunger passes through the threaded hole to press the output shaft.

5. The transmission structure according to claim 4, characterized in that a radially outer surface of the output shaft is provided with a groove, and the spring plunger is snapped into the groove through the threaded hole.

6. A transmission arrangement as claimed in any one of claims 1 to 5, characterised in that a first bearing is provided between the third and fourth gears and the driven shaft, the third and fourth gears being journalled to the driven shaft by the first bearing.

7. The transmission structure according to any one of claims 1 to 5, wherein the first gear is a boss gear, an inner groove is formed in a boss of the boss gear, a key is provided on a radially outer surface of the input shaft, and the input shaft and the boss gear are connected to the inner groove through the key.

8. The transmission structure according to claim 2 or 3, wherein a second bearing is provided between the first gear and the output shaft, a third bearing is provided on the second gear, a fourth bearing, a fifth bearing and an oil protection ring are further provided in this order along the axial direction on the output shaft, a spacer is abutted between the third bearing and the fourth bearing, and the fifth bearing and the oil protection ring are provided on both sides of the housing near the end surface of the output shaft.

9. A variator construction as claimed in any of claims 1 to 5, wherein the first and second drive grooves are four in number, the first and second drive grooves are arcuate grooves, the four first and second drive grooves are arcuate grooves in quarter pitch distributed around the circumference of the second gear, the first drive members correspond to the number of first drive grooves, and the second drive members correspond to the number of second drive grooves.

10. The transmission structure according to any one of claims 1 to 5, characterized in that the output shaft is a six-tooth spline shaft, and the slide guide is a six-tooth spline sleeve, and the six-tooth spline shaft is axially slidably keyed with the six-tooth spline sleeve.