CN208203926U - Power transmission device - Google Patents

Abstract

The utility model relates to power transmission device technical fields, a kind of specifically power transmission device, including epicyclic gearbox and the torque control device of thickeing, thicken epicyclic gearbox input terminal be equipped with drive mechanism, drive mechanism is connected by several planet pins with planet carrier, double planetary gears that thicken also are arranged on planet pin, double planetary gear surfaces that thicken are respectively equipped with first gear structure and second gear structure, and first gear ring that thickens is connected with the output shaft housing on the outside of the output shaft of the epicyclic gearbox that thickens.The utility model is compared with the existing technology, it designs reasonable, compact-sized, it can make driving motor No Load Start, load then steady slowly starting, extend the starting time, reduce the moment of accelerating of load, so that the service performance of conveyer belt can be improved and prolong the service life, it is more advantageous to the automatic control that drive system realizes controllable flexible speed regulation simultaneously, is easily installed and dismantles.

Description

Power transmission device

Technical field

The utility model relates to power transmission device technical field, a kind of specifically power transmission device.

Background technique

Currently, the balk cargo conveyor of large conveying quantity, long range, high-speed cruising be widely used in coal cinder and ore etc. bulk cargos Conveying starts transmitting device, and mainly use two ways: one is electrode, torque-limiting hydraulic coupler, retarder composition, because It is influenced in driving transmission process by torque-limiting hydraulic coupler, therefore the starting time is short, cannot require according to controlling curve Accurate control belt starting, it is poor to there is starting stationarity, impacts the problems such as big, and serious consequence will be such that conveyer belt generates laterally to split Mouthful, become the maximum hidden danger of production safety；It is another to be formed for frequency conversion electrode, frequency converter and retarder, at present still because of converter technique It is immature, and the smoothness, the start up curve that start speed regulation section are gently spent not high, especially underground coal mine has anti-explosion safety requirement, Frequency converter can't be competent at, and high-power technology is also not bery mature.

Meanwhile in the prior art Bulk material generally by install outside motor common speed reducer again by deceleration control system come The speed of conveyer belt is controlled, and deceleration control system generally uses sun wheel drive.Existing retarder mainly includes cycloidal pin Gear teeth roller box, common planetary gear case, worm and gear gear-box and harmonic wave gear-box, wherein ordinary single-stage and double pinions The reduction ratio range of case is smaller, and worm and gear gearbox speed reduction is bigger, but input speed is low, and application range is limited, at present Using it is crucial that cycloidal pinwheel reduction box is crankshaft driving, transmission accuracy is higher, but mechanism is complicated, processing technology requirement It is high；Harmonic reduction case is face contact multi-tooth meshing, close structure, but exporting is Reed-type cup type ring, engagement position with it is defeated Portion's palpus flexible deformation, structure impact resistance are poor out.And the requirement with the development and application of new technology, to gear-box and joint All constantly improving.

Therefore, upgrading and warship propeller for ship speed of the utility model patent for existing market balk cargo conveyor Moment of torsion control is spent, a kind of novel power transmission device is designed, the clutch of miniaturization is applied into industrial automation belt and is passed Dynamic and robot control system, which combines, constitutes complete ecosystem.

Summary of the invention

Utility model aims to solve the deficiencies in the prior art, a kind of power transmission device are provided, using planet Frame driving, reduction ratio range is big, modularized design easy to accomplish, and can make driving motor No Load Start, reduces load Moment of accelerating, controllable to adjust the speed, starting is steady, soft, safe and reliable to operation.

To achieve the goals above, a kind of power transmission device is designed, including thicken epicyclic gearbox and moment of torsion control dress It sets, the input terminal of the epicyclic gearbox that thickens is equipped with drive mechanism, and the drive mechanism with driving mechanism for being connected Transmission is realized afterwards, and the drive mechanism is connected by several planet pins with planet carrier, so that the drive mechanism and planet Frame is integrally formed structure and can rotate synchronously under the driving of driving mechanism to form first order transmission, in the row after being connected It is also arranged with monotropic thick planetary gear on star pin, is able to drive when the drive mechanism and planet carrier rotate synchronously described Planet pin and monotropic thick planetary gear coaxially revolve, and the monotropic thick planetary gear surface is equipped with gear structure, the gear Structure is meshed with second to thicken in epicyclic gearbox the gear ring that thickens is fixed on to form the second level and be driven and make The described monotropic thick planetary gear generates rotation, and the gear structure gear ring that also thickens with first is meshed to form the third level Transmission, described first gear ring that thickens are connected with the output shaft housing on the outside of the output shaft of the epicyclic gearbox that thickens will move Power is exported to output shaft housing, and power is transferred to output shaft by torque control device by the output shaft housing.

The torque control device is by several clutch groups, the piston structure being correspondingly arranged with clutch group and is arranged Clutch base on the outside of output shaft is constituted, and the clutch group side is matched by several static friction plates and clutch base It closes, the clutch group other side is matched by several movable friction plates with output shaft housing, and the piston structure is used for Change the gap between several static friction plates of clutch group and the gap between several movable friction plates, output is turned round to realize The control of square.

The utility model also has following preferred technical solution:

The drive mechanism and planet carrier is set on the outside of a hollow shaft, and described hollow shaft one end is exposed in the row that thickens Outside star gear-box, it is connected between the drive mechanism and planet carrier by planet pin, it is described under the driving of driving mechanism Drive mechanism, planet carrier and planet pin can be rotated along the axis coaxle of the hollow shaft.

The epicyclic gearbox that thickens further includes casing assembly, and described hollow shaft one end is equipped with axle sleeve, the axis Set one end is connected with first gear ring that thickens, and the other end is connected with the output shaft housing, the axle sleeve and casing assembly it Between be also arranged with 3rd bearing.

The gear ring that thickens of described second is mutually fixed with the casing assembly, and the gear ring that thickens of described second also passes through The second bearing on the outside of the drive mechanism is set in be connected with the drive mechanism.

The gear ring that thickens of described first is also connected by being set in the first bearing on the outside of the planet carrier with planet carrier.

The quantity of the planet pin is 2,3,5 or 7.

Along teeth directional direction continuous variation occurs for monotropic thick planetary gear thickness, helical angle and the pressure angle.

The static friction plate is matched by the spline that clutch base outer surface is equipped with clutch base, described dynamic to rub The spline that pad is equipped with by output shaft shell inner surface is connected with output shaft housing.

The direction of motion in the output shaft housing along piston structure is equipped with several grooves corresponding with piston structure, Return spring is equipped in the groove, the return spring outer end is connected with the piston structure, for realizing piston The reset of structure.

The piston structure is fixed on the inside of piston shell, and the piston shell is connected with piston connecting plate, The piston structure is able to drive the piston connecting plate and stretches on the axial direction of output shaft, the piston structure Between piston shell and clutch base between piston connecting plate, described, the shell of the piston shell and output shaft it If dry bearing is respectively equipped between, for improved force conduction and play a supporting role.

Compared with the existing technology, design is reasonable, compact-sized for the utility model, can make driving motor No Load Start, load Then steady slowly starting, extends the starting time, reduces the moment of accelerating of load, so that the service performance of conveyer belt can be improved and prolong Long life, while it being more advantageous to the automatic control that drive system realizes controllable flexible speed regulation, it is easily installed and dismantles, it is excellent Point is:

The utility model uniquely devises a kind of power transmission device, including torque control device and the planetary gear that thickens Case, using the controllable torque clutch that can independently use, by controlling the pressure size of clutch, to control the torsion of output shaft Square makes driving motor No Load Start, reduces the moment of accelerating of load, controllable to adjust the speed, and starting is steady, soft, and operational safety can It leans on；And a kind of new planetary transmission structure and method are creatively realized, no setting is required sun gear, thus in protosun wheel Settable hollow shaft at position is used for cable and reference axis, and line type objects pass through, and have the more transmission of balance and stability, Higher movement transmitting accuracy and reliable and stable service life can more steadily control speed using the epicyclic gearbox that thickens Degree, transmission process are more safe and reliable.

Also, the utility model uses monotropic thick planetary gear, monotropic thickness planetary gear do not need through spline or Non-circular structure connects, easy processing, and single thickness planetary gear to thicken gear ring between guaranteeing output under one-way shaft pushes away effect Gap is small and backhaul difference is small, and bigger output torque is obtained in can also realizing in a limited space, compared to roller cycloid and humorous Wave transmission has the more transmission of balance and stability, higher movement transmitting accuracy, relatively reliable technique, excellent gear surface Heat treatment process provides the reliable and stable service life.

Detailed description of the invention

Fig. 1 is the structure sectional view of the utility model power transmission device in an embodiment；

Fig. 2 is the structural schematic diagram of the utility model power transmission device in an embodiment；

Fig. 3 is the structural schematic diagram that the utility model is applied to balk cargo conveyor in an embodiment；

In figure: the 1. casing assemblies 2. first monotropic thick planetary gear 4. second of gear ring 3. that thickens thickens gear ring 5. 10. 3rd bearing of drive mechanism 6. driving mechanism, 7. axle sleeve, 8. planet carrier, 9. planet pin, 11. second bearing 12. gear structure and 13. gear structure of the second gear ring engaging section and the first gear ring engaging section 14. export shaft housing 15. 19. clutch group of hollow shaft 16. first bearing, 17. piston connecting plate, 18. piston shell, 20. return spring 21. 24. bearing of piston structure 22. clutch base, 23. output shaft, 25. conveyer belt 26. first drives roller 27. Second driving 28. third of roller drives 29. driving motor of roller, 30. power transmission device, 31. rotation drive structure.

Specific embodiment

The present invention will be further explained below with reference to the attached drawings, and the structure and principle of this device and method are to this profession It is very clearly for people.It should be appreciated that embodiment described herein and specific embodiment are only used to explain this hair It is bright, it is not intended to limit the present invention.

Referring to Fig. 1 and Fig. 2, technical solution of the present invention mainly includes two parts, that is, thicken epicyclic gearbox and torque Control device is cooperated by two parts, together constitutes power transmission device 30 of the invention.

Referring to the planetary gear box part that thickens on the right side of Fig. 1 and on the right side of Fig. 2, in present embodiment, in the planet that thickens The input terminal of gear-box is equipped with drive mechanism 5 for realizing transmission after being connected with driving mechanism 6, the drive mechanism 5 by Transmission chain that one sprocket wheel and sprocket wheel are equipped with is constituted, and the sprocket wheel constitutes the after cooperating by transmission chain and driving mechanism 6 Primary transmission drives transmission chain rotation by the driving mechanism 6, to rotate with movable sprocket.

A hollow shaft 15 is equipped in the epicyclic gearbox that thickens, 15 right end of hollow shaft exposes in the epicyclic gearbox that thickens Outside can be used for current supply cable in hollow shaft 15 or axis, line type objects pass through.The sprocket wheel is set in 15 outside of hollow shaft, 15 outside of hollow shaft is also arranged with planet carrier 8, and several planet pins are equipped between the sprocket wheel and the planet carrier 8 9.Several planet pins 9 are centrosymmetric arrangement or non-central isogonism arrangement in the circumferential, and it is fixed to meet Gear Planet Transmission Rule.The planet pin 9 can be parallel to transmission center, can also be angled relationship with transmission center, i.e. planet pin 9 can be with It is parallel to hollow shaft 15, hollow shaft 15 can also be not parallel to, thus at an angle between hollow shaft 15.The planet pin 9 One end is rotatedly connected with drive mechanism 5, and the other end is rotatedly connected with planet carrier 8, so that thicken epicyclic gearbox at work, row Relative position between star pin 9 and drive mechanism 5, between planet pin 9 and planet carrier 8 will not change, but planet pin 9 can Rotation is carried out by axis of the axis of planet pin 9.

Monotropic thick planetary gear 3 is also arranged on the planet pin 9,3 surface of the monotropic thick planetary gear is equipped with Gear structure is fixed with second in the epicyclic gearbox that thickens and thickens gear ring 4, the gear structure and described Second gear ring 4 that thickens is meshed.When the driving mechanism 6 drives the sprocket wheel to rotate clockwise, the transmission knot Structure 5, planet pin 9 and planet carrier 8 can be using the straight line revolution clockwise synchronous as axis where the hollow shaft 15, and pass through row Star pin 9 drives the monotropic thick planetary gear 3 to synchronize revolution clockwise as axis using the straight line where the hollow shaft 15, Second due to being meshed with gear structure thicken gear ring 4 be it is fixed, cause monotropic thick planetary gear 3 will receive one with it is public Turn contrary power, so that opposite direction rotation of the monotropic thickness planetary gear 3 to revolution direction, in the present embodiment, The monotropic thick planetary gear 3 is the power counterclockwise by one, to start rotation counterclockwise.

It is meshed in the gear structure that 3 surface of the described monotropic thick planetary gear the is equipped with gear ring 2 that also thickens with first, it is described The first output shaft housing 14 in 23 outside of output shaft for thickeing gear ring 2 and the epicyclic gearbox that thickens be connected, when described When monotropic thickness 3 rotation of planetary gear, since gear structure is meshed with first gear ring 2 that thickens, it will drive described first and thicken The rotation of 2 opposite direction of gear ring drives first gear ring 2 that thickens to rotate clockwise in the present embodiment, and thicken tooth by first Circle 2 drive described in the thicken output shaft housing 14 in the outside of output shaft 23 of epicyclic gearbox rotate, described first thickens gear ring 2 Connection is realized by interference fit or fixed pin or bolt between output shaft housing 14.

The epicyclic gearbox that thickens further includes casing assembly 1, described second thicken gear ring 4 be fixed on it is described outer On shell component 1, described second, which thickens, is meshed on the downside of 4 left end of gear ring with the gear structure, in the drive mechanism 5 Non- to be arranged with second bearing 11 with 6 place of matching of driving mechanism, described second, which thickens, passes through second bearing on the downside of 4 right end of gear ring It constitutes and is rotatably assorted between 11 and rotational structure, to guarantee stability when drive mechanism 5 rotates and second thicken gear ring 4 Stress it is uniform.

Described first thickens gear ring 2 as U-shaped structure, and one end of U-shaped structure is meshed with the gear structure 11, U It is rotatedly connected by being set in the first bearing 16 in 8 outside of planet carrier with planet carrier 8 on the inside of the other end of shape structure, to guarantee the One thicken gear ring 2 rotate when stability.Also be arranged with axle sleeve 7 in 15 left end of hollow shaft, 7 right end of axle sleeve with First gear ring 2 that thickens is fixedly linked, and left end is connected with the output shaft housing 14, so that described first thickens 2 turns of gear ring The axle sleeve 7 can be driven to rotate when dynamic, and thereby the output shaft housing 14 is driven to rotate, and the axle sleeve 7 with 3rd bearing 10 is also arranged between casing assembly 1, stability when guaranteeing that axle sleeve 7 rotates.Preferably, the third axis It holds 10 and uses high rigidity crossed cylindrical roller bearing, the high rigidity crossed cylindrical roller bearing uses sealing structure, left and right Two sides are separated by grease or rouge rouge.

Sprocket wheel described in present embodiment and transmission chain can be replaced by other drive mechanisms 5, need to only be able to achieve drive Transmission between dynamic structure and drive mechanism 5 and planet carrier 8, this is apparent for a person skilled in the art 's.

In present embodiment, thickness, helical angle and the pressure angle of the monotropic thick planetary gear 3 are sent out along teeth directional direction Raw continuous variation, every a pair of meshed gears respectively meet gear engagement principle of forming involute.And the monotropic thick planet tooth The working face of wheel 3 is an inclined-plane, and the gear structure is arranged on inclined-plane, is preferably thickend with first tooth convenient for gear structure Circle 2 and second gear ring 4 that thickens engage respectively.

Deceleration control system in the prior art generally uses sun wheel drive, and the present invention is driven using planet carrier 8, benefit With concatenated Gear Planet Transmission to obtain required module design reduction ratio, and using the structure of Double gear-ring, for Double gear-ring Must be there are two freedom degree, therefore can be there are two exporting revolving speed, so the revolving speed that setting second thickens gear ring 4 is zero, then revolving speed It is exported by first gear ring 2 that thickens, to ensure that the gap of output is small, backhaul is poor small, while the structure reduction ratio range is big.This In embodiment, first order transmission speed ratio be i1, first thicken gear ring 2 and second thicken gear ring 4 the number of teeth be respectively z2, z4； Single thickness planetary gear number of teeth is z1, then overall ratio is i1*z4/ (z4-z2), while meeting z4-z2=3*n, and wherein n is planet Take turns number.Speed ratio can according to circumstances be changed by first order transmission to meet the requirement of the different speed ratios of same model, planet passes Available higher power density is moved, there is the more transmission of balance and stability, higher movement transmitting accuracy, relatively reliable Technique, excellent gear surface heat treatment process provide the reliable and stable service life；It can be more using the epicyclic gearbox that thickens Stable control speed, transmission process are more safe and reliable.

In one preferred embodiment, the quantity of the planet pin is 2,3,5 or 7.Work as planet When the quantity of pin is 2, the monotropic thick planetary gear quantity of setting is also 2, the planet pin and monotropic thick row for needing to use The negligible amounts of star gear, cost is relatively low, and has been able to achieve the object of the present invention.When the quantity of planet pin is 3,5 Perhaps 7 when monotropic thick planetary gear quantity also mutually should be 3,5 or 7, thick planetary gear rotation monotropic at this time compared with For stabilization, the torque of output is likely to affect due to frictional resistance when quantity is continued growing.

Referring to the torque control device part on the left of Fig. 1 and on the left of Fig. 2, the torque control device is by several clutches Group 19, the piston structure 21 being correspondingly arranged with clutch group 19 and the clutch base 22 for being set in 23 outside of output shaft are constituted, Several static friction plates are successively arranged on the downside of the clutch group 19, the static friction plate is set by 22 outer surface of clutch base Some splines are matched with clutch base 22, and several movable friction plates are successively arranged on the upside of the clutch group 19, and described is dynamic Friction plate is connected by exporting the spline that 14 inner surface of shaft housing is equipped with output shaft housing 14, passes through the piston structure 21 Apply different pressure, to change between gap and several movable friction plates between several static friction plates of clutch group 19 Gap, to realize the control to output torque.Preferably, the clutch group 19 is wet clutch group.

Piston shell 18 and piston connecting plate 17 are additionally provided on the outside of the piston structure 21, the piston is fixed on institute 18 right side of piston shell stated, 21 right end of piston structure is connected with piston connecting plate 17, and the piston structure 21 It is able to drive the piston connecting plate 17 to stretch on the axial direction of output shaft 23, to realize to movable friction plate and static friction The change of the pressure of piece, to change the gap between the gap and movable friction plate between static friction plate.The piston structure Between piston shell 18 and clutch base 22 between 21 and piston connecting plate 17, described, the piston shell 18 and output If being respectively equipped with dry bearing 24 between shaft housing 14, for improved force conduction and play a supporting role, can be by piston structure 21 axial forces generated by oil pressure are simultaneously transmitted on output shaft housing 14.

It is several corresponding with piston structure 21 recessed along being axially arranged with for output shaft 23 in the output shaft housing 14 Slot, the groove is interior to be equipped with return spring 20, and 20 outer end of return spring is connected with the piston connecting plate 17, when When the piston structure 21 reduces the pressure applied or stops applying pressure, due to the resilient force of return spring 20, Piston structure 21 can be made to reset, be also no longer influenced by pressure so as to cause static friction plate and movable friction plate, and return back to initial bit It sets.

It is additionally provided with outer housing on the outside of the output shaft housing 14, it is described for protecting entire torque control device Outer housing is fixedly linked with casing assembly 1, and the outer housing left end is equipped with opening, for extending out to outer housing for output shaft 23 Outside.

Embodiment 1

The application method and principle of power transmission device 30 of the present invention are as follows: by driving mechanism 6 drive drive mechanism 5, The monotropic thick planet tooth that planet pin 9 and the planet pin 9 between planet carrier 8, drive mechanism 5 and planet carrier 8 are equipped with Wheel 3 rotates coaxially, and the gear structure and fixed second being equipped with due to the monotropic thick planetary gear 3 by surface are thickend tooth Circle 4 is meshed, so that the monotropic thick planetary gear 3 is rotated around planet pin 9, due to the monotropic thick planetary gear 3 gear structures being also equipped with by surface are meshed with first gear ring 2 that thickens, so that first thickens the rotation of gear ring 2, and according to Secondary first gear ring 2 that thickens that passes through drives the output shaft housing 14 for thickeing 23 outside of epicyclic gearbox output shaft to rotate, and passes through Exporting shaft housing 14 drives output shaft 23 to rotate, at this point, control piston structure 21 is to the output shaft housing 14 and output shaft The clutch group 19 being equipped between 23 applies pressure, so that several movable friction plates between clutch group 19 and output shaft housing 14 Gap and clutch group 19 and output shaft 23 between several static friction plates space change, and then control output shaft 23 obtain The output torque obtained changes the output of output shaft 23.

Embodiment 2

It is the schematic diagram that power transmission device 30 of the present invention is applied to balk cargo conveyor referring to Fig. 3, conveyer belt 25 is wound It is arranged on several driving rollers, driving roller one end is equipped with rotation drive structure 31, and driving roller passes through rotate driving knot Structure 30 is connected with the output shaft 23 of power transmission device 30 of the present invention, and the input terminal and driving motor 29 of power transmission device 30 connect It connects, several described driving rollers are symmetrical arranged in the left and right sides of conveyer belt 25, by taking its right side as an example, in conveyer belt 25 Right side is equipped with the first driving roller 26, and the second driving roller 27, the second driving rolling are equipped with below the left side of the first driving roller 26 The lower right-hand side of cylinder 27 is equipped with third and drives roller 28, and the first driving roller 26, second drives roller 27, third driving The W-shaped setting of roller 28.

Technical solution of the present invention is by the control to input and output torque, when realizing steady slowly starting, extending starting Between, reduce load acceleration away from effect, thus substantially increase conveyer belt 25 service performance and prolong the service life, together When be more advantageous to the automatic control that drive system realizes controllable flexible speed regulation；Simultaneously because conveyer belt can be absorbed in wet clutch 25 shock loading protects the driving equipments such as motor, is especially suitable for the upgrading of existing Bulk material and the spiral shell on naval vessel The control of paddle speed-torque is revolved, the clutch group 19 of miniaturization can apply to industrial automation belt drive, incorporating mill device people control System processed forms entire ecosystem.

Also, for double planetary gears that thicken, since double planetary gears that thicken need to connect by components such as splines It connects, causes gap adjustment more difficult, and the complicated gap that may cause output of processing and backhaul difference are larger, the present invention uses The biggish monotropic thick planetary gear 3 of width improves, this structure can be used in the cost that can satisfy under speed ratio feelings relatively Low application field.

Claims (9)

1. a kind of power transmission device, including thicken epicyclic gearbox and torque control device, it is characterised in that:

The input terminal of the epicyclic gearbox that thickens is equipped with drive mechanism, and the drive mechanism with driving mechanism for being connected Transmission is realized afterwards, and the drive mechanism is connected by several planet pins with planet carrier, so that the drive mechanism and planet Frame is integrally formed structure and can rotate synchronously under the driving of driving mechanism to form first order transmission, in the row after being connected It is also arranged with monotropic thick planetary gear on star pin, is able to drive when the drive mechanism and planet carrier rotate synchronously described Planet pin and monotropic thick planetary gear coaxially revolve, and the monotropic thick planetary gear surface is equipped with gear structure, the gear Structure is meshed with second to thicken in epicyclic gearbox the gear ring that thickens is fixed on to form the second level and be driven and make The described monotropic thick planetary gear generates rotation, and the gear structure gear ring that also thickens with first is meshed to form the third level Transmission, described first gear ring that thickens are connected with the output shaft housing on the outside of the output shaft of the epicyclic gearbox that thickens will move Power is exported to output shaft housing, and power is transferred to output shaft by torque control device by the output shaft housing；

The torque control device is by several clutch groups, the piston structure being correspondingly arranged with clutch group and is set in defeated Clutch base on the outside of shaft is constituted, and the clutch group side is matched by several static friction plates with clutch base, institute The clutch group other side stated by several movable friction plates with output shaft housing match, the piston structure for changing from The gap between gap and several movable friction plates between several static friction plates of clutch group, to realize the control to output torque System.

2. a kind of power transmission device as described in claim 1, it is characterised in that the drive mechanism and planet carrier is arranged On the outside of a hollow shaft, described hollow shaft one end, which is exposed, to thicken outside epicyclic gearbox, the drive mechanism and planet carrier Between be connected by planet pin, under the driving of driving mechanism, the drive mechanism, planet carrier and planet pin can be in described The axis coaxle of empty axis rotates.

3. a kind of power transmission device as claimed in claim 2, it is characterised in that the epicyclic gearbox that thickens further includes Casing assembly, described hollow shaft one end are equipped with axle sleeve, and described axle sleeve one end is connected with first gear ring that thickens, the other end and institute The output shaft housing stated is connected, and is also arranged with 3rd bearing between the axle sleeve and casing assembly.

4. a kind of power transmission device as claimed in claim 3, it is characterised in that described second thickens gear ring and described Casing assembly is mutually fixed, and described second thicken gear ring also by be set in second bearing on the outside of the drive mechanism with The drive mechanism is connected, and described first thickens first bearing and planet of the gear ring also by being set on the outside of the planet carrier Frame is connected.

5. a kind of power transmission device as described in claim 1, it is characterised in that the quantity of the planet pin is 2,3 It is a, 5 or 7.

6. a kind of power transmission device as described in claim 1, it is characterised in that the monotropic thick planetary gear thickness, Helical angle and pressure angle occur continuously to change along teeth directional direction.

7. a kind of power transmission device as described in claim 1, it is characterised in that the static friction plate passes through clutch base The spline that outer surface is equipped with is matched with clutch base, the spline that the movable friction plate is equipped with by output shaft shell inner surface It is connected with output shaft housing.

8. a kind of power transmission device as described in claim 1, it is characterised in that along piston knot in the output shaft housing The direction of motion of structure is equipped with several grooves corresponding with piston structure, is equipped with return spring in the groove, described returns It returns outer spring end to be connected with the piston structure, for realizing the reset of piston structure.

9. a kind of power transmission device as described in claim 1, it is characterised in that the piston structure is fixed on piston shell Internal side, and the piston shell is connected with piston connecting plate, and the piston structure is able to drive the piston and connects Fishplate bar on the axial direction of output shaft stretch, between the piston structure and piston connecting plate, the piston shell with If piston shell between clutch base, described and being respectively equipped with dry bearing between the shell of output shaft, the biography for improved force It leads and plays a supporting role.