CN220910376U - Double-clutch multi-gear transmission case - Google Patents

Abstract

The utility model relates to a double-clutch multi-gear transmission case, which comprises a forward and backward power reversing assembly, a multi-gear assembly, a high-low gear shifting device, a front axle output assembly, a rear axle output assembly and a PTO power output assembly, wherein the forward and backward power input assembly comprises an I shaft, an II shaft, an III shaft, an IV shaft, a V shaft, a reversing clutch and a forward clutch, the multi-gear assembly comprises a VI shaft, a VII shaft and a synchronizer, the three sets of synchronizers are arranged on the VI shaft, the connection and the discharge of the three sets of synchronizers are controlled through a gear shifting handle, so that the switching of 6 gears is realized, and the rear axle output assembly comprises a central transmission, a differential mechanism, a brake and a final transmission.

Description

Double-clutch multi-gear transmission case

Technical Field

The utility model relates to the technical field of gear boxes, in particular to a double-clutch multi-gear box.

Background

At present, various operation functions of the tractor are commonly realized through a variable speed transmission mechanism in the tractor, but most of the existing tractor gearboxes adopt a plurality of wet clutches and auxiliary speed change configuration meshing sleeves and realize uninterrupted gear shifting operation of the transmission through a hydraulic control system. Compared with the traditional mechanical gear shifting technology, the gear shifting technology of the gearbox realizes power reversing without stepping on a clutch, improves the operation comfort of a driver, reduces the operation difficulty and labor intensity to a certain extent, and improves the operation quality and the working efficiency. However, with the increasing number of tractor operation projects and matched agricultural machinery, the more gears are required to be arranged on the tractor, the more the gears are, the more complicated the structure is, and the higher requirements on the market positioning and gear shifting quality of the tractor are provided. Under the trend, the existing power shift gearbox has certain defects, and the main defects are that the structure is complex, for example, the power shift is carried out for 4 gears, and four wet clutches C1, C2, C3 and C4 are required to be controlled, the manufacturing is complex, the cost is high, the axial dimension is long, the synchronous inertia is low, the automatic shift requirement cannot be met, and the like.

The existing small and medium horsepower tractor has more matched transmission boxes, more products and more gear sleeve gear shifting or synchronizer gear shifting, the electrohydraulic control and the power switching control mainly depend on import, and no proper matched transmission box exists, so how to provide a reliable and stable gear box with more gears and more power output becomes a technical problem to be solved urgently by those skilled in the art.

Disclosure of utility model

In order to solve the technical problems, the utility model aims to provide the double-clutch multi-gear transmission case which is compact in structure, reliable in work and rich in function.

In order to achieve the above object, the present utility model adopts the following technical scheme:

The double-clutch multi-gear transmission case comprises a forward and backward power reversing assembly, a multi-gear assembly, a high-low gear shifting device, a front axle output assembly, a rear axle output assembly and a PTO power output assembly, wherein the forward and backward power reversing assembly comprises an I shaft, an II shaft, an III shaft, an IV shaft, a V shaft, a reversing clutch and a forward clutch, a gear Z1 and a gear Z2 are fixed on the I shaft, a gear Z4 and a gear Z5 are arranged on the II shaft, the gear Z4 is combined with or separated from the II shaft through the reversing clutch, the gear Z5 is combined with or separated from the II shaft through the forward clutch, a gear Z6 is fixed on the III shaft, the gear Z1 is meshed with the gear Z6, and the gear Z6 is meshed with the gear Z4; the gear Z2 is meshed with the gear Z5; the II shaft is connected with the IV shaft through a spline sleeve, a gear Z12 is fixed on the IV shaft, a gear Z13 is fixed on the V shaft, and the gear Z12 is meshed with the gear Z13; the multi-gear assembly comprises a VI shaft, a VII shaft and a synchronizer, wherein the VI shaft is connected with the V shaft through a spline sleeve, and a gear Z14, a gear Z15, a gear Z16, a gear Z17, a gear Z18 and a gear Z19 are fixed on the VI shaft; the gear Z20, the gear Z21, the gear Z22, the gear Z23, the gear Z24 and the gear Z25 are fixed on the VII shaft; wherein the gear Z14 is meshed with the gear Z20, the gear Z15 is meshed with the gear Z21, the gear Z16 is meshed with the gear Z22, the gear Z17 is meshed with the gear Z23, the gear Z18 is meshed with the gear Z24, the gear Z19 is meshed with the gear Z25, three sets of synchronizers are arranged on a VI shaft, the row connection of the three sets of synchronizers is controlled through a gear shifting handle, so that the switching of 6 gears is realized, the VII shaft is transmitted with a VIII shaft through a high-low gear shifting device, the high-low gear shifting device is provided with three positions of a direct gear, a neutral gear and a low gear, the gear Z26 is directly connected with the VIII shaft through the high-low gear shifting device when the high-low gear shifting device is in the direct gear position, the gear Z26 is meshed with the gear Z29 when the high-low gear shifting device is in the low gear position, the gear Z27 is meshed with the gear Z30, and the gear Z29 is a double gear sleeved on the IX shaft, the rear axle output assembly comprises a central transmission, a differential mechanism, a brake and a final transmission, wherein the central transmission comprises a spiral bevel gear Z34 carried on the VIII axle and a spiral bevel gear Z37 connected with a differential case of the differential mechanism, the spiral bevel gear Z34 is meshed with the spiral bevel gear Z37 to drive a left half axle XIX shaft, a right half axle XIX shaft and a XI shaft of the differential mechanism to transmit, the left half axle XIX shaft, the right half axle XIX shaft and the XI shaft are respectively connected with the brake and the final transmission, the brake is a wet brake, the braking of the left and right output of the rear axle can be realized, the final transmission is a primary planetary reduction, the right half axle XIX shaft and the XII shaft transmit power to a sun gear Z40 of the final transmission planetary device, and then the planetary frame transmits the power to the XIX shaft and the XII shaft to complete the rear axle output.

As the preferred scheme, still include front axle power take off subassembly, front axle power take off subassembly includes XI axle, and IX axle and X axle that pass through the spline housing hookup, VIII axle passes through intermeshing's gear Z31 and gear Z28 drive IX axle, and IX axle passes through the spline drive X axle, be equipped with gear Z32 on the X axle, be fixed with gear Z33 on the XI axle, carry out the transmission through gear Z33 and gear Z32 meshing, accomplish front axle output.

Preferably, a front axle disengaging device is further arranged on the X-axis, and the front axle disengaging device enables the gear Z32 to be combined with or separated from the X-axis.

The power take-off device comprises a power take-off assembly, and is characterized by further comprising a power take-off assembly, wherein the power take-off assembly comprises a XII shaft, a XIV shaft, a XII shaft and a XII shaft, a gear Z7, a gear Z8 and a gear Z9 are further arranged on the XII shaft, a gear Z3 is arranged on the I shaft, the gear Z7 is meshed with the gear Z3, a gear Z11, a gear Z10 and a power take-off device are arranged on the XII shaft, the gear Z11 is meshed with the gear Z9, the gear Z10 is meshed with the gear Z8, the power take-off device enables a transmission between the XII shaft and the XII shaft through the gear Z11 and the gear Z9 or a transmission between the XII shaft and the gear Z8, the XII shaft and the XII shaft are connected through spline sleeves, a gear Z35 is arranged on the XII shaft, and the gear Z35 is meshed with the gear Z36.

Preferably, the gear Z7 is engaged with or disengaged from the shaft of the XII through a power disengaging wet clutch, and an anti-belt clutch is further arranged on the power disengaging wet clutch.

As a preferred scheme, the oil pump output assembly further comprises an oil pump output assembly, wherein the oil pump output assembly comprises an XVI shaft and an XV shaft, a gear Z43 is arranged on the XV shaft, a gear Z44 is arranged on the XVI shaft, the gear Z43 and the gear Z7 are in meshed transmission, and the gear Z44 and the gear Z43 are in meshed transmission.

The hydraulic oil pump is characterized by further comprising a duplex pump, wherein one oil pump of the duplex pump provides working oil for each wet clutch of the transmission system, lubricating oil is provided for the wet clutch, the gears and the bearings, and the other oil pump provides working oil for a lifting mechanism and a steering mechanism of the whole vehicle.

As a preferable scheme, wet brakes are respectively arranged on the axle shafts XIX and XIX of the rear axle power output assembly, so that the braking of the whole automobile can be effectively realized, and a differential lock is further arranged in the differential mechanism.

Preferably, the power disengaging wet clutch, the reversing clutch and the forward clutch are all controlled by electrohydraulic control valves.

Compared with the prior art, the utility model has the beneficial effects that:

According to the utility model, under the cooperation of the components such as a plurality of shafting, a plurality of gears, a plurality of synchronizers, a forward clutch, a backward clutch, a differential mechanism component and the like, the organic switching of a plurality of forward gears and a plurality of backward gears is realized, the front and rear power reversing is realized by adopting electrohydraulic control, the power combination and the disconnection of PTO power output are realized, the structure is compact, the disassembly and the assembly are convenient, the work is reliable, and the imported product can be replaced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application.

FIG. 1 is a schematic cross-sectional view of the present utility model;

FIG. 2 is a schematic cross-sectional view of a differential mechanism, wet brake and axle shaft of the present utility model;

Fig. 3 is a transmission schematic diagram of the present utility model.

The reference numerals are: 1. an I shaft; 2. XII shaft; 3. XIII axis; 4. XI axis; 5. power disengaging wet clutch; 6. an X axis; 7. a VII shaft; 8. an IX axis; 9. a II shaft; 11. IV shaft; 12. a V-axis; 13. a synchronizer; 14. a VIII axis; 15. an XIV axis; 16. an XVIII axis; 17. a differential mechanism; 18. a wet brake; 19. x and IX axes; 20. an XI axis; 101. a reverse clutch; 102. a forward clutch; 21. a high-low gear shift device; 22. a PTO shift arrangement; 23. an anti-banding clutch; 24. front axle disengaging means.

Description of the embodiments

It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

Furthermore, in the description of the present utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," "counterclockwise," etc. indicate or are based on the orientation or positional relationship shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more, unless otherwise clearly defined.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The utility model is further illustrated by the following examples in conjunction with the accompanying drawings:

As shown in fig. 1 to 3, the dual clutch multi-gear transmission case comprises a forward and backward power reversing assembly, a multi-gear assembly, a high and low gear shifting device, a front axle output assembly, a rear axle output assembly and a PTO power output assembly, wherein the forward and backward power reversing assembly comprises an i shaft, an ii shaft, an iii shaft, an iv shaft, a v shaft, a reverse clutch and a forward clutch, a gear Z1 and a gear Z2 are fixed on the i shaft, a gear Z4 and a gear Z5 are arranged on the ii shaft, the gear Z4 is combined with or separated from the ii shaft through the reverse clutch, the gear Z5 is combined with or separated from the ii shaft through the forward clutch, a gear Z6 is fixed on the iii shaft, the gear Z1 is meshed with the gear Z6, and the gear Z6 is meshed with the gear Z4; the gear Z2 is meshed with the gear Z5; the II shaft is connected with the IV shaft through a spline sleeve, a gear Z12 is fixed on the IV shaft, a gear Z13 is fixed on the V shaft, and the gear Z12 is meshed with the gear Z13; the multi-gear assembly comprises a VI shaft, a VII shaft and a synchronizer, wherein the VI shaft is connected with the V shaft through a spline sleeve, and a gear Z14, a gear Z15, a gear Z16, a gear Z17, a gear Z18 and a gear Z19 are fixed on the VI shaft; the gear Z20, the gear Z21, the gear Z22, the gear Z23, the gear Z24 and the gear Z25 are fixed on the VII shaft; wherein the gear Z14 is meshed with the gear Z20, the gear Z15 is meshed with the gear Z21, the gear Z16 is meshed with the gear Z22, the gear Z17 is meshed with the gear Z23, the gear Z18 is meshed with the gear Z24, the gear Z19 is meshed with the gear Z25, three sets of synchronizers are arranged on the VI shaft, the row connection of the three sets of synchronizers is controlled through a gear shifting handle, so that the 6 gear shifting is realized, the VIII shaft and the VII shaft are transmitted through a high-low gear shifting device, the high-low gear shifting device is provided with three positions of a direct gear, a neutral gear and a low gear, the gear Z26 is directly connected with the VIII shaft through the high-low gear shifting device when the high-low gear shifting device is in the direct gear position, the gear Z26 is meshed with the gear Z29 when the high-low gear shifting device is in the low gear position, the gear Z27 is meshed with the gear Z30, and the gear Z29 is a duplex gear sleeved on the IX shaft, the rear axle output assembly comprises a central transmission, a differential mechanism, a brake and a final transmission, wherein the central transmission comprises a spiral bevel gear Z34 carried on the VIII axle and a spiral bevel gear Z37 connected with a differential case of the differential mechanism, the spiral bevel gear Z34 is meshed with the spiral bevel gear Z37 to drive a left half axle XIX shaft, a right half axle XIX shaft and a XI shaft of the differential mechanism to transmit, the left half axle XIX shaft, the right half axle XIX shaft and the XI shaft are respectively connected with the brake and the final transmission, the brake is a wet brake, the braking of the left and right output of the rear axle can be realized, the final transmission is a primary planetary reduction, the right half axle XIX shaft and the XII shaft transmit power to a sun gear Z40 of the final transmission planetary device, and then the planetary frame transmits the power to the XIX shaft and the XII shaft to complete the rear axle output.

The double-clutch multi-gear transmission case further comprises a front axle power output assembly, the front axle power output assembly comprises a XI shaft 4, an IX shaft 8 and an X shaft 6 which are connected through a spline sleeve, a gear Z33 is fixed on the XI shaft, a gear Z32 is arranged on the X shaft, the gear Z33 is meshed with the gear Z32, a gear Z26 is further arranged on the VII shaft 7, a gear Z27 and a gear Z28 are further arranged on the VII shaft 7, a gear Z29, a gear Z30 and a gear Z31 are arranged on the IX shaft 8, a direct gear, a neutral gear and a low gear are arranged on the high-low gear shifting device 21, the gear Z26 is directly connected with the VIII shaft 14 for transmission through the high-low gear shifting device, and the VIII shaft 14 drives the IX shaft through the gear Z31 and the gear Z28 which are meshed with each other when the high-low gear shifting device 21 is at the direct gear position; when the high-low gear shifting device is in a low gear position, the gear Z26 is meshed with the gear Z29, the gear Z27 is meshed with the gear Z30, the gear Z29 is meshed with the gear Z30 to form a duplex gear sleeved on the IX shaft, and then the IX shaft is driven by the gear Z31 and the gear Z28 which are meshed with each other. A front axle disconnect 24 is also provided on the x-axis, which disconnects or connects gear Z32 to or from the x-axis 6.

The double-clutch multi-gear transmission case further comprises a PTO power output assembly, the PTO power output assembly comprises a XII shaft 2, a XII shaft 3, a XIV shaft, a XII shaft and a XII shaft, a gear Z7, a gear Z8 and a gear Z9 are further arranged on the XII shaft, a gear Z3 is arranged on the I shaft, the gear Z7 is meshed with the gear Z3, a gear Z11, a gear Z10 and a PTO gear shifting device 22 are arranged on the XII shaft, the gear Z11 is meshed with the gear Z9, the gear Z10 is meshed with the gear Z8, the PTO gear shifting device 22 enables transmission between the XII shaft and the XII shaft through the gear Z11 and the gear Z9 or transmission between the XII shaft and the gear Z10 and the gear Z8, the XII shaft 15 and the XII shaft are connected through spline sleeves, a gear Z35 is arranged on the XII shaft, a gear Z36 is arranged on the XII shaft, and the gear Z35 is meshed with the gear Z36. The gear Z7 is connected with or disconnected from the XII shaft through the power-disengaging wet clutch 5, and the power-disengaging wet clutch 5 is also provided with an anti-belt-row clutch 23.

The double-clutch multi-gear transmission case further comprises an oil pump output assembly, wherein the oil pump output assembly comprises a XVI shaft and a XV shaft, a gear Z43 is arranged on the XV shaft, a gear Z44 is arranged on the XVI shaft, the gear Z43 and the gear Z7 are in meshed transmission, and the gear Z44 and the gear Z43 are in meshed transmission.

The double-clutch multi-gear transmission case also comprises a double pump, wherein the double pump provides working oil for each wet clutch of the transmission system and provides lubricating oil for the wet clutches, gears and bearings, so that the transmission system works normally. The duplex pump can also provide working oil for a lifting mechanism of the whole machine.

The axle shafts XIX and XIX of the rear axle power output assembly are respectively provided with a wet brake 18, so that the braking of the whole vehicle can be effectively realized, and a differential lock is further arranged in the differential mechanism. The power disengaging wet clutch, the reversing clutch and the forward clutch are all controlled by electrohydraulic control valves.

The working specific implementation mode of the utility model is as follows: the power is input from the I shaft, and is respectively transmitted to Z6 of the III shaft, Z5 of the II shaft and Z7 of the XII shaft which are meshed through gears Z1, Z2 and Z3 (Z7 is an input gear of the PTO output and is meshed with Z43, and is described later), the electrohydraulic control system controls the connection row of the forward clutch and the reverse clutch, when the forward clutch is connected, the Z5 transmits the power to the II shaft through KV to complete the power input of each forward gear, and when the reverse clutch is connected, the Z6 transmits the power to the II shaft through KR, so as to complete the power input of the reverse gear; the II shaft and the IV shaft are connected through a spline to transmit power, and the power is transmitted to the Z13 through the Z12 and transmitted to the V shaft; the V shaft is connected with the VI shaft through a spline, and power is transmitted to the VI shaft; three sets of synchronizers are arranged on the VI shaft, the connection row of the three sets of synchronizers is controlled through a gear shifting handle, 6 gear switching is realized, wherein Z14 and Z20 are meshed (6 gear), Z15 and Z21 are meshed (5 gear), Z16 and Z22 are meshed (4 gear), Z17 and Z23 are meshed (3 gear), Z18 and Z24 are meshed (2 gear), Z19 and Z25 are meshed (1 gear), and Z20, Z21, Z22, Z23, Z24 and Z25 transmit power to the VII shaft; the VII shaft transmits power to three positions of a direct gear (left side), a neutral gear (middle position) and a low gear (right side) on the Z26 shaft and the VIII shaft which are rigidly connected, when the gear is sleeved on the left side, the power is transmitted to the VIII shaft from the Z26 shaft, when the gear is sleeved in the middle, the gear is neutral, when the gear is sleeved on the right side, the gear is in a low gear, the power is transmitted to the Z29 of the IX shaft from the Z26 shaft (Z29 and Z30 are duplex gears), the Z30 transmits the power to the Z27 on the VIII shaft, and the Z27 transmits the power to the VIII shaft through the gear sleeve; the power is split, one part of the power is transmitted to the differential mechanism through the spiral bevel Z34 and the Z37 and is transmitted to the rear axle, and the other part of the power is transmitted to the Z31 through the Z28 connected with the spline of the VIII shaft, and the Z31 transmits the power to the IX shaft and is transmitted to the front axle;

Front axle power flow: the IX shaft transmits power to the spline housing to the X shaft, if the front axle disengaging gear is combined, the X shaft transmits power to the Z32, the Z32 transmits power to the Z32, and the Z32 transmits power to the XI shaft (front axle output shaft) to finish the front axle output.

Rear axle power flow: the differential mechanism transmits power to the half shafts XIX and XII on two sides of the rear axle, the differential lock is provided with a meshing gear sleeve, the differential speed or no differential speed can be realized, the half shafts XIX and XII transmit power to the sun wheel Z40 of the planetary device and to the planet carrier, and the planet carrier transmits power to the XIX and XII shafts, so that the output of the rear axle is completed.

Oil pump output: z7 of the XII shaft transmits power to Z43, Z43 transmits power to Z44, and the power is transmitted to the XVI shaft, namely an oil pump output shaft;

PTo power output: z7 of the XII shaft receives power, the electrohydraulic control system controls the power disengagement wet clutch, and when the power disengagement wet clutch is disengaged, the anti-band clutch is combined, the power is not output, and no band is arranged. Z7 transmits power to the shaft XII through the power-off wet clutch when the power-off wet clutch is engaged; z8 and Z9 of the XII shaft are respectively meshed with Z10 and Z11 on the XIII shaft, a PTO gear shifting device is operated to realize PTo gear switching, and the Z10 and Z11 transmit power to the XII shaft; the XIII shaft transmits power to the XIV shaft through a spline housing, and the XIV shaft transmits power to the XIII shaft through the spline housing; the power of the XVII axis is transferred to Z36 through Z35 and then transferred to the XVIII axis, so that the power take-off of the PTO is completed.

The utility model has two forward and backward wet clutches, a 6-gear synchronizer gear shifting device, a high-and-low gear tooth sleeve gear shifting device and a PTO belt to prevent the power of a belt row from disengaging the wet clutches. The combination of the forward wet clutch and the backward wet clutch is released, and the gear switching and the power reversing of the forward 12 gears and the backward 12 gears are realized by matching with the organic combination of the synchronizer gear shifting device and the high and low gear tooth sleeve gear shifting device.

The power disengagement wet clutch with the belt discharging prevention function and the power disengagement high-low gear can effectively realize the power disengagement and engagement of the PTO, and can realize the organic switching of two gears; the transmission case of the utility model has spiral bevel transmission and planetary reduction, effectively realizes high reduction ratio, and has a differential mechanism and a differential lock, thereby effectively controlling the differential speed of the left wheel and the right wheel.

The utility model also has a main clutch control valve and a PTO control valve, and the electrohydraulic control ensures that the power cutting combination of gear shifting and PTO is convenient and comfortable.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by those skilled in the art without departing from the spirit and principles of the utility model, and any simple modification, equivalent variation and modification of the above embodiments in light of the technical principles of the utility model may be made within the scope of the present utility model.

Claims (9)

1. Double clutch multi-gear transmission case, its characterized in that: the power reversing device comprises a forward and backward power reversing assembly, a multi-gear assembly, a high-low gear shifting device, a front axle output assembly, a rear axle output assembly and a PTO power output assembly, wherein the forward and backward power reversing assembly comprises an I shaft, an II shaft, an III shaft, an IV shaft, an V shaft, a reversing clutch and a forward clutch, a gear Z1 and a gear Z2 are fixed on the I shaft, a gear Z4 and a gear Z5 are arranged on the II shaft, the gear Z4 is combined with or separated from the II shaft through the reversing clutch, the gear Z5 is combined with or separated from the II shaft through the forward clutch, a gear Z6 is fixed on the III shaft, the gear Z1 is meshed with the gear Z6, and the gear Z6 is meshed with the gear Z4; the gear Z2 is meshed with the gear Z5; the II shaft is connected with the IV shaft through a spline sleeve, a gear Z12 is fixed on the IV shaft, a gear Z13 is fixed on the V shaft, and the gear Z12 is meshed with the gear Z13; the multi-gear assembly comprises a VI shaft, a VII shaft and a synchronizer, wherein the VI shaft is connected with the V shaft through a spline sleeve, and a gear Z14, a gear Z15, a gear Z16, a gear Z17, a gear Z18 and a gear Z19 are fixed on the VI shaft; the gear Z20, the gear Z21, the gear Z22, the gear Z23, the gear Z24 and the gear Z25 are fixed on the VII shaft; the transmission is characterized in that gears XI 14 and Z20 are meshed, gears XI 15 and Z21 are meshed, gears XI 16 and Z22 are meshed, gears XI 17 and X23 are meshed, gears Z18 and Z24 are meshed, gears Z19 and Z25 are meshed, three sets of synchronizers are arranged on a VI shaft, three sets of synchronizers are controlled to be connected through a gear shifting handle so as to realize the switching of 6 gears, the VII shaft is in transmission with the VIII shaft through a high-low gear shifting device, the high-low gear shifting device is provided with three positions of direct gears, neutral gears and low gears, the high-low gear shifting device is in direct gear position, the gears Z26 are in direct connection transmission with the VIII shaft through the high-low gear shifting device, the gears Z27 are meshed with the gears Z30 in the low gear position, the Z29 is in transmission with the double gears sleeved on the IX shaft, the VIII shaft is driven, the rear axle output assembly comprises a central transmission, a brake and a final gear, the central transmission and a bevel gear are in transmission, the left and right axles are respectively connected with a differential housing and a differential housing, and a differential housing is in transmission, the differential housing is in transmission 37, and a differential housing is in transmission with the transmission, and a differential housing 37, and a differential housing is in transmission is completed.

2. The dual clutch multi-gear transmission case according to claim 1, further comprising a front axle power output assembly, wherein the front axle power output assembly comprises a XI shaft, an IX shaft and an X shaft which are connected through a spline sleeve, the VIII shaft drives the IX shaft through a gear Z31 and a gear Z28 which are meshed with each other, the IX shaft drives the X shaft through a spline, a gear Z32 is arranged on the X shaft, a gear Z33 is fixed on the XI shaft, and the transmission is performed through meshing of the gear Z33 and the gear Z32, so that the front axle output is completed.

3. A dual clutch multi-speed transmission as claimed in claim 2 wherein a front axle disconnect is also provided on the x-axis, the front axle disconnect engaging or disengaging gear Z32 with the x-axis.

4. The double clutch multi-gear transmission box according to claim 1, further comprising a PTO power take-off assembly, wherein the PTO power take-off assembly comprises a XII shaft, a XIII shaft, a XIV shaft, and a XII shaft, wherein the XII shaft is further provided with a gear Z7, a gear Z8, and a gear Z9, the I shaft is provided with a gear Z3, the gear Z7 is meshed with the gear Z3, the XII shaft is provided with a gear Z11, a gear Z10, and a PTO shift device, the gear Z11 is meshed with the gear Z9, the gear Z10 is meshed with the gear Z8, the PTO shift device drives the XII shaft and the XII shaft through the gear Z11 and the gear Z10, or the gear Z8, the XII shaft is provided with a gear Z36, and the gear Z35 is meshed with the gear Z36.

5. The double-clutch multi-gear transmission case according to claim 4, wherein the gear Z7 is engaged with or disengaged from the shaft of the gear x through a power-off wet clutch, and an anti-backlash clutch is further provided on the power-off wet clutch.

6. The dual clutch multi-speed transmission according to claim 4, further comprising an oil pump output assembly comprising an xvi shaft and an xv shaft, wherein gear Z43 is provided on the xv shaft, gear Z44 is provided on the xvi shaft, gear Z43 is in meshed transmission with gear Z7, and gear Z44 is in meshed transmission with gear Z43.

7. The dual clutch multi-speed transmission of claim 1, further comprising a dual pump, wherein one of the dual pumps provides working oil for each wet clutch of the drive train and provides lubricating oil for the wet clutch, gears, bearings, and the other oil pump provides working oil for the lift and steering mechanisms of the entire vehicle.

8. The dual clutch multi-gear transmission of claim 1, wherein wet brakes are respectively arranged on the axle shafts xix and xix of the half axle of the rear axle power output assembly to effectively brake the whole vehicle, and a differential lock is further arranged in the differential mechanism.

9. The dual clutch multi-speed transmission of claim 5, wherein the power-off wet clutch, the reverse clutch and the forward clutch are each controlled by an electro-hydraulic control valve.