CN215634748U

CN215634748U - Multi-gear speed change device and tractor comprising same

Info

Publication number: CN215634748U
Application number: CN202122059386.1U
Authority: CN
Inventors: 潘龙龙; 樊建; 朱昊; 王恒; 赵青; 赵健松; 牛圣友; 王学龙
Original assignee: Weichai Lovol Heavy Industry Co Ltd
Current assignee: Weichai Lovol Intelligent Agricultural Technology Co Ltd
Priority date: 2021-08-30
Filing date: 2021-08-30
Publication date: 2022-01-25
Anticipated expiration: 2031-08-30

Abstract

The utility model discloses a multi-gear speed changing device and a tractor comprising the same, and belongs to the technical field of agricultural mechanical equipment. The multi-speed transmission device includes: a first box body; the first rotating shaft is provided with a plurality of gear driving gears and wet clutches, the wet clutches are respectively arranged close to the gear driving gears, shells of the wet clutches are respectively connected with the first rotating shaft, friction plates are respectively arranged in the wet clutches, and the gear driving gears are respectively movably connected with the first rotating shaft through the friction plates; a plurality of driven gears which are respectively in transmission connection with the gear driving gears are arranged on the rotating shaft II; and the third rotating shaft is provided with a plurality of gear driven gears and gear synchronizers, the gear synchronizers are respectively arranged close to the gear driven gears, the gear driven gears are respectively movably connected with the third rotating shaft through the gear synchronizers close to the gear driven gears, and the gear driven gears are respectively meshed with the transmission driven gears which are arranged right opposite to the gear driven gears. The multi-gear speed changing device is beneficial to reducing the length of the rotating shaft.

Description

Multi-gear speed change device and tractor comprising same

Technical Field

The utility model relates to the technical field of agricultural mechanical equipment, in particular to a multi-gear speed changing device and a tractor comprising the same.

Background

At present, a plurality of operation functions of a tractor are generally realized through a speed change transmission mechanism in the tractor, but most of existing tractor gearboxes are arranged in a longitudinal plane of two rotating shafts, and a power shuttle type gear shift speed change section, a power high-low gear shift speed change section and a mechanical main gear shift speed change section of the tractor gearbox in the arrangement mode are respectively arranged in sequence in the length direction of a chassis, so that when gears are increased, the length of the rotating shafts is increased, the length of a tractor gearbox box is also increased, the production cost of the tractor gearbox box is also increased, the gearbox in the tractor is a main component part of the chassis, and further the length of the chassis is often longer; in addition, too long chassis length also makes the wheelbase difficult to control. Thus, there is a need for a multi-speed transmission that facilitates reducing the length of a rotating shaft while achieving multi-speed transmission.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to overcoming at least one of the disadvantages of the prior art described above, and to providing a multi-speed transmission that facilitates reducing the length of a rotating shaft while achieving multi-speed transmission; in addition, a tractor is also provided.

The technical scheme for solving the technical problems is as follows: a multiple speed transmission comprising:

a first box body;

the first rotating shaft is horizontally and rotatably installed in the first box body, the input end of the first rotating shaft penetrates through the first box body and is used for being in transmission connection with a rotary driving device, a plurality of gear driving gears are arranged on the first rotating shaft at intervals, a plurality of wet clutches are arranged on the first rotating shaft in a one-to-one correspondence mode, the wet clutches are respectively arranged close to one gear driving gear, the shells of the wet clutches are respectively connected with the first rotating shaft, friction plates controlled by hydraulic pressure are respectively arranged in the wet clutches, and the gear driving gears are respectively and movably connected with the first rotating shaft through the friction plates;

the second rotating shaft is horizontally and rotatably arranged in the first box body in parallel to the first rotating shaft and is positioned on the radial outer side of the first rotating shaft, a plurality of transmission driven gears are arranged on the second rotating shaft in a one-to-one correspondence mode, and the transmission driven gears are in transmission connection with the gear driving gears which are arranged just opposite to the transmission driven gears respectively;

the pivot three, be on a parallel with two horizontal rotations in the pivot are installed just be located in the box radial outside of pivot two, the one end of pivot three is worn out the box one forms the output, the one-to-one is a plurality of in the pivot three the transmission driven gear interval is equipped with a plurality of gear driven gear, the one-to-one is a plurality of in the pivot three the gear driven gear is equipped with a plurality of gear synchronizers, every the gear synchronizers is close to one respectively the gear driven gear sets up, the gear driven gear is respectively through being close to its setting the gear synchronizers with three swing joint of pivot, it is a plurality of the gear driven gear respectively with rather than just setting up the transmission driven gear meshing.

The utility model has the beneficial effects that: in the embodiment, the first rotating shaft, the second rotating shaft and the third rotating shaft are arranged in the first box body in parallel, the first rotating shaft is provided with the gear driving gears which are respectively controlled by the wet clutch at intervals, the second rotating shaft is fixedly provided with the plurality of transmission driven gears, the third rotating shaft is provided with the plurality of gear driven gears which are respectively controlled by the gear synchronizer, and the corresponding gears can be controlled by controlling the wet clutch and the gear synchronizer to form different transmission combination modes, so that the output end of the third rotating shaft has various output speeds, multi-speed switching and output are realized, and the requirements of different output speeds are met; furthermore, a plurality of gears for realizing speed change are respectively arranged on the first rotating shaft, the second rotating shaft and the third rotating shaft, so that the rotating shafts for mounting the gears are favorably shortened, the length size of the first box body is favorably reduced, the production cost of the first box body is reduced, and the compactness of the multi-gear speed change device can be improved; when the multi-gear speed change device in the embodiment is installed on a tractor, the length size of the chassis is favorably reduced, and the problem that the wheelbase is difficult to control due to the fact that the chassis is too long is avoided.

In addition, on the basis of the above technical solution, the present invention may be further improved as follows, and may further have the following additional technical features.

According to an embodiment of the present invention, the multi-speed transmission further includes:

the second box body is arranged in parallel to the first box body and is arranged on the axial outer side of the output end of the third rotating shaft;

the power transmission shaft is horizontally and rotatably arranged in the second box body in parallel with the third rotating shaft, the input end of the power transmission shaft penetrates out of the second box body, the input end of the power transmission shaft is in transmission connection with the output end of the third rotating shaft, and a plurality of power transmission gears are arranged on the power transmission shaft at intervals;

an auxiliary variable speed output shaft which is parallel to the power transmission shaft and horizontally and rotatably arranged in the second box body and is positioned at the radial outer side of the power transmission shaft, one end of the auxiliary variable speed output shaft, which is far away from the third rotating shaft, penetrates out of the box body to form a power output end, a plurality of auxiliary speed change driven gears are arranged on the auxiliary speed change output shaft in a one-to-one correspondence way with the plurality of power transmission gears, a plurality of first meshing sleeves are arranged on the auxiliary speed change output shaft in a one-to-one correspondence mode, correspond to the plurality of auxiliary speed change driven gears at intervals, are respectively arranged on the auxiliary speed change output shaft close to one auxiliary speed change driven gear in a sliding mode and can slide along the axial direction of the auxiliary speed change output shaft, the auxiliary transmission driven gears are movably connected with the auxiliary transmission output shaft through the meshing sleeves I arranged close to the auxiliary transmission driven gears respectively, and the auxiliary transmission driven gears are meshed with the power transmission gears arranged opposite to the auxiliary transmission driven gears respectively.

In the embodiment, the second box body is arranged in the multi-gear speed changing device, so that the multi-gear speed changing device comprises the first box body and the second box body, the rotating shafts are respectively arranged in the two box bodies, the first box body can be used as a main speed changing area, the second box body can be used as an auxiliary speed changing area, different power transmission combination modes are formed by adjusting the gear meshing condition arranged on the rotating shafts, and further the multi-gear speed changing device has multiple output speeds, the rotating shafts for installing gears can be shortened, the length size of each box body can be reduced, and the compactness and the operation reliability of the multi-gear speed changing device can be improved; when the multi-gear speed change device in the embodiment is installed on a tractor, the length size of the chassis is further reduced, and the problem that the wheelbase is difficult to control due to the fact that the chassis is too long is avoided.

and the input end of the crawling gear transmission mechanism is in transmission connection with the output end of the rotating shaft III, and the output end of the crawling gear transmission mechanism is in transmission connection with the input end of the power transmission shaft.

In this embodiment, by being provided with the crawling gear transmission mechanism, the input end of the power transmission shaft is connected with the output end of the third rotating shaft in a transmission manner through the crawling gear transmission mechanism, so that the output speed of the output end of the third rotating shaft can be reduced through the crawling gear transmission mechanism, and the multi-gear speed change device can meet the working condition requirement of operation at an extremely low running speed.

According to one embodiment of the utility model, the creeper gear transmission includes:

the crawling gear power input gear is arranged on the power output end of the rotating shaft III;

the crawling gear rotating shaft is horizontally and rotatably arranged between the second box body and the first box body in a parallel mode with the third rotating shaft, and the crawling gear rotating shaft is located on the radial outer side of the third rotating shaft;

the first crawling gear driven gear is arranged on the crawling gear rotating shaft opposite to the crawling gear power input gear and meshed with the crawling gear power input gear;

the crawling gear driving gear is parallel to the crawling gear driven gear I and is arranged on the crawling gear rotating shaft;

the middle power transmission shaft is arranged coaxially with the rotating shaft III, one end of the middle power transmission shaft is movably connected with the rotating shaft III, the auxiliary variable speed output shaft is arranged coaxially with the rotating shaft III, and the other end of the middle power transmission shaft is movably connected with the auxiliary variable speed output shaft;

a second crawling gear driven gear which is arranged opposite to the crawling gear driving gear and is rotatably installed on the intermediate power transmission shaft, and the second crawling gear driven gear is meshed with the crawling gear driving gear;

the first hanging gear is installed on the power output end of the third rotating shaft and is positioned at the rear end of the power input gear of the crawling gear;

the second meshing sleeve is slidably mounted between the second crawling gear driven gear and the first hanging gear and can slide along the axial direction of the third rotating shaft, the second crawling gear driven gear can be movably connected with the first middle power transmission shaft through the second meshing sleeve, the first middle power transmission shaft can be movably connected with the first hanging gear through the second meshing sleeve, and one end of the first middle power transmission shaft is movably connected with the third rotating shaft through the second meshing sleeve;

and the crawling gear output gear is parallel to the crawling gear driven gear II and is arranged on the intermediate power transmission shaft.

In this embodiment, the second crawling gear driven gear can be movably coupled to the intermediate power transmission shaft through the second meshing sleeve, and the intermediate power transmission shaft can be movably coupled to the first hooking gear through the second meshing sleeve, so that the second crawling gear driven gear can be movably coupled to the intermediate power transmission shaft through sliding the second meshing sleeve, or the intermediate power transmission shaft can be movably coupled to the first hooking gear, which is beneficial to realizing power output of different gears, so that the multi-gear speed changing device has multiple different output speeds, and the speed changing capability of the multi-gear speed changing device is improved.

According to one embodiment of the utility model, the plurality of power transmission gears comprise a first power transmission gear and a second power transmission gear which are arranged on the power transmission shaft at intervals;

the plurality of auxiliary transmission driven gears comprise first auxiliary transmission driven gears and second auxiliary transmission driven gears which are arranged on the auxiliary transmission output shaft at intervals, and the plurality of first meshing sleeves comprise first meshing sleeves and second meshing sleeves which are arranged on the auxiliary transmission output shaft at intervals; the first auxiliary transmission driven gear is meshed with the first power transmission gear, the second auxiliary transmission driven gear is meshed with the second power transmission gear, the first auxiliary transmission driven gear is movably connected with the auxiliary transmission output shaft through the first meshing sleeve, the crawling gear output gear is also movably connected with the auxiliary transmission output shaft through the first meshing sleeve, and the second auxiliary transmission driven gear is movably connected with the auxiliary transmission output shaft through the second meshing sleeve;

and an auxiliary speed change power input gear is also arranged on the power transmission shaft and is opposite to the crawling gear output gear, and the auxiliary speed change power input gear is meshed with the crawling gear output gear.

In this embodiment, the first counter driven gear is movably coupled to the counter output shaft through the first meshing sleeve, the creep shift output gear is also movably coupled to the counter output shaft through the first meshing sleeve, and the second counter driven gear is movably coupled to the counter output shaft through the second meshing sleeve, so that different rotation power transmission modes can be realized by controlling the first meshing sleeve and the second meshing sleeve respectively, the multi-gear transmission device has multiple different output speeds, and the transmission capacity of the multi-gear transmission device is improved; in addition, the auxiliary speed change power input gear is meshed with the crawling gear output gear, so that the output power of the crawling gear transmission mechanism is conveniently transmitted to the power transmission shaft.

According to one embodiment of the present invention, the plurality of gear driving gears include a reverse driving gear, a first gear driving gear and a second gear driving gear which are installed on the first rotating shaft at intervals;

the plurality of driven transmission gears comprise a first-gear transmission gear, a second-gear transmission gear and a third-gear transmission gear which are arranged on the second rotating shaft at intervals, the first-gear transmission gear is in transmission connection with the reverse gear driving gear, the second-gear transmission gear is meshed with the first-gear driving gear, and the third-gear transmission gear is meshed with the second-gear driving gear;

the plurality of gear driven gears comprise a first gear driven gear, a second gear driven gear and a third gear driven gear which are arranged on the rotating shaft III at intervals, the first gear driven gear is meshed with the first gear transmission gear, the second gear driven gear is meshed with the second gear transmission gear, and the third gear driven gear is in transmission connection with the third gear transmission gear.

In this embodiment, the first rotating shaft is provided with the reverse gear driving gear, the first gear driving gear and the second gear driving gear which are controlled by the wet clutch, the second rotating shaft is provided with the first gear transmission gear, the second gear transmission gear and the third gear transmission gear, the third rotating shaft is provided with the first gear driven gear, the second gear driven gear and the third gear driven gear which are controlled by the gear synchronizer, and different rotation power transmission modes can be realized by controlling the wet clutch and the gear synchronizer, so that the multi-gear speed changing device has various different output speeds.

the idler shaft is horizontally and rotatably arranged in the first box body in a parallel mode with the first rotating shaft and located on the radial outer side of the first rotating shaft, an idler gear is arranged on the idler shaft and is opposite to the reverse gear driving gear, the idler gear is located in the first box body, and the idler gear is meshed with the transmission driven gear and the reverse gear driving gear which are opposite to each other.

In the embodiment, the idler shaft is arranged, the idler gear is arranged on the idler shaft and is opposite to the reverse gear driving gear, and the idler gear is meshed with the transmission driven gear and the reverse gear driving gear which are opposite to each other, so that the rotation directions of the gear transmission gear and the reverse gear driving gear which are opposite to each other are consistent, and the rotation power of the reverse gear driving gear is transmitted in the same direction.

According to one embodiment of the utility model, the first rotating shaft and the second rotating shaft are arranged in parallel front and back in the horizontal direction, the idler shaft is positioned on the upper side between the first rotating shaft and the second rotating shaft, the third rotating shaft and the second rotating shaft are arranged in parallel up and down in the vertical direction, and the third rotating shaft is positioned on the lower side of the second rotating shaft.

In the embodiment, the first rotating shaft and the second rotating shaft are arranged in parallel in the front and back direction of the horizontal direction, and the first rotating shaft and the second rotating shaft are arranged in the front and back direction, so that the utilization rate of a transverse space is increased, the size of the first box body in the front and back direction is increased, the transverse section of the first box body is enlarged, and the structural strength of the first box body is improved; furthermore, the idler shaft is positioned on the upper side between the first rotating shaft and the second rotating shaft, and the third rotating shaft is positioned on the lower side of the second rotating shaft, so that the arrangement among the shafts is more compact, and the production cost of the first box body is reduced.

and the third-gear auxiliary transmission gear is arranged on the second rotating shaft and is positioned at the rear end of the third-gear transmission gear, and the third-gear driven gear is meshed with the third-gear auxiliary transmission gear.

In the embodiment, the third-gear auxiliary transmission gear is mounted on the second rotating shaft and is meshed with the third-gear driven gear, the third-gear driven gear transmits power to the third-gear driven gear through the third-gear auxiliary transmission gear, and compared with the case that the third-gear transmission gear is meshed with the second-gear driving gear and the third-gear driven gear at the same time, resistance generated by meshing of the third-gear transmission gear is reduced, the rotating speed obtained by the third-gear driven gear is favorably improved, and further the maximum rotating speed of the multi-gear speed changing device is favorably improved.

In addition, the present embodiment provides a tractor including:

a frame assembly;

in the multi-gear speed change device, the multi-gear speed change device is mounted on the frame assembly.

The multi-gear speed change device is arranged on the frame assembly in the tractor in the embodiment, because the first rotating shaft, the second rotating shaft and the third rotating shaft are arranged in the first box body in parallel, the first rotating shaft is provided with gear driving gears which are respectively controlled by the wet clutches at intervals, the second rotating shaft is fixedly provided with a plurality of transmission driven gears, the third rotating shaft is provided with a plurality of gear driven gears which are respectively controlled by the gear synchronizers, the corresponding gears can be controlled by controlling the wet clutches and the gear synchronizers, different transmission combination modes are formed, and the output end of the third rotating shaft has a plurality of output speeds, so that multi-speed switching and output are realized, and the requirements of different output speeds are met; furthermore, a plurality of gears for realizing speed change are respectively arranged on the first rotating shaft, the second rotating shaft and the third rotating shaft, so that the rotating shafts for mounting the gears are favorably shortened, the length size of the first box body is favorably reduced, the production cost of the first box body is reduced, and the compactness and the operation reliability of the multi-gear speed change device can be improved; in addition, the length and the size of the chassis are reduced, and the problem that the wheelbase is difficult to control due to the fact that the chassis is too long is avoided.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic diagram of a multi-speed transmission according to an embodiment of the present invention;

FIG. 2 is a schematic view of a first rotating shaft, a second rotating shaft and a third rotating shaft installed in a first box body according to an embodiment of the present invention;

FIG. 3 is a left side view of FIG. 2 taken along A-A;

FIG. 4 is a schematic view of the power transmission shaft and the counter-speed output shaft mounted in the second case and the creeper gear transmission mechanism according to the embodiment of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1. a first rotating shaft, 2, a second rotating shaft, 3, an idler shaft, 4, a third rotating shaft, 5, a power transmission shaft, 6, a secondary transmission output shaft, 7, an intermediate power transmission shaft, 8, a creep gear rotating shaft, 9, a second meshing sleeve, 10, a reverse gear driving gear, 11, a first wet clutch, 12, a first gear driving gear, 13, a second wet clutch, 14, a third wet clutch, 15, a second gear driving gear, 20, a first gear transmission gear, 21, a second gear transmission gear, 22, a third gear transmission gear, 23, a third gear auxiliary transmission gear, 30, an idler gear, 40, a first gear driven gear, 41, a first gear synchronizer, 42, a second gear driven gear, 43, a second gear synchronizer, 44, a third gear driven gear, 45, a creep gear power input gear, 46, a first hitching gear, 50, a secondary transmission power input gear, 51, a first power transmission gear, 52. the power transmission gear II, 60, the auxiliary transmission driven gear I, 61, the auxiliary transmission driven gear II, 62, the first meshing sleeve I, 63, the second meshing sleeve I, 70, the crawling gear driven gear II, 71, the crawling gear output gear 72, the hanging gear II, 80, the crawling gear driven gear I, 81, the crawling gear driving gear, 90, the hanging meshing gear I, 111, the first piston I, 131, the second piston I, 141, the third piston I, 461, the first external spline hub, 621, the hanging meshing gear II, 631, the hanging meshing gear III, 701 and the second external spline hub.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the utility model will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

The present embodiment provides a multi-speed transmission device, as shown in fig. 1 and 2, including:

a first box body;

the rotating shaft I1 is horizontally and rotatably installed in the box I, the input end of the rotating shaft I1 penetrates through the box I and is used for being in transmission connection with a rotary driving device, a plurality of gear driving gears are arranged on the rotating shaft I1 at intervals, a plurality of wet clutches are arranged on the rotating shaft I1 in a one-to-one correspondence mode, each wet clutch is close to one gear driving gear, the shell of each wet clutch is connected with the rotating shaft I1, friction plates controlled by hydraulic pressure are arranged in each wet clutch, and the gear driving gears are movably connected with the rotating shaft I1 through the friction plates;

the second rotating shaft 2 is horizontally and rotatably arranged in the first box body in parallel to the first rotating shaft 1 and is positioned on the radial outer side of the first rotating shaft 1, a plurality of transmission driven gears are arranged on the second rotating shaft 2 in a one-to-one correspondence mode, and the transmission driven gears are in transmission connection with the gear driving gears which are arranged just opposite to the transmission driven gears respectively;

a third rotating shaft 4 horizontally and rotatably installed in the first box body in parallel with the second rotating shaft 2 and located on the radial outer side of the second rotating shaft 2, one end of the third rotating shaft 4 penetrates out of the first box body to form an output end, a plurality of transmission driven gears are arranged on the third rotating shaft 4 in a one-to-one correspondence mode at intervals, a plurality of gear synchronizers are arranged on the third rotating shaft 4 in a one-to-one correspondence mode, each gear synchronizer is respectively close to one gear driven gear, the gear driven gears are respectively movably connected with the third rotating shaft 4 through the gear synchronizers close to the gear synchronizers, and the gear driven gears are respectively meshed with the transmission driven gears just opposite to the gear driven gears.

In this embodiment, as shown in fig. 1 and 2, a first rotating shaft 1, a second rotating shaft 2 and a third rotating shaft 4 are arranged in parallel in a first box, gear driving gears controlled by wet clutches are arranged on the first rotating shaft 1 at intervals, a plurality of transmission driven gears are fixedly mounted on the second rotating shaft 2, a plurality of gear driven gears controlled by gear synchronizers are arranged on the third rotating shaft 4, corresponding gears can be controlled by controlling the wet clutches and the gear synchronizers, different transmission combination modes are formed, and further, the output end of the third rotating shaft 4 has a plurality of output speeds, so that multi-speed switching and output are realized, and requirements of different output speeds are met; furthermore, a plurality of gears for realizing speed change are respectively arranged on the first rotating shaft 1, the second rotating shaft 2 and the third rotating shaft 4, so that the rotating shafts for mounting the gears are favorably shortened, the length size of the first box body is favorably reduced, the production cost of the first box body is reduced, and the compactness of the multi-gear speed change device can be improved; when the multi-gear speed change device in the embodiment is installed on a tractor, the length size of the chassis is favorably reduced, and the problem that the wheelbase is difficult to control due to the fact that the chassis is too long is avoided.

In this embodiment, the multi-gear speed changing device can realize multiple speed changes, meet the speed change requirements of multiple gears, and conveniently meet the speed change output power, and the multi-gear speed changing device can specifically adjust the number of gears mounted on different rotating shafts according to the speed change requirements; in addition, the specific structure of the wet clutch and the gear synchronizer in this embodiment may also refer to the existing wet clutch, and the installation manner of the wet clutch and the gear synchronizer may also refer to the existing wet clutch in the field, which is not described herein again. In addition, the rotation driving device in this embodiment is specifically an engine, and other suitable rotation driving devices may also be adopted as the rotation driving device.

Further, in this embodiment, as shown in fig. 1 and 2, the other end of the first rotating shaft 1 also penetrates through the box body to form a power output end for outputting power, so that the other device is driven to rotate by the other end of the first rotating shaft 1, and the function of the multi-gear speed changing device is increased; in addition, the power output end of the rotating shaft 1 in the embodiment is provided with a spline, so that a power transmission mechanism or an execution mechanism can be conveniently installed on the power output end of the rotating shaft 1.

As shown in fig. 1, 2 and 4, the multi-speed transmission according to one embodiment of the present invention further includes:

the second box body is arranged in parallel to the first box body and is arranged on the axial outer side of the output end of the third rotating shaft 4;

the power transmission shaft 5 is horizontally and rotatably arranged in the second box body in parallel with the rotating shaft III 4, the input end of the power transmission shaft 5 penetrates out of the second box body, the input end of the power transmission shaft 5 is in transmission connection with the output end of the rotating shaft III 4, and a plurality of power transmission gears are arranged on the power transmission shaft 5 at intervals;

and the auxiliary speed change output shaft 6 is horizontally and rotatably arranged in the second box body in parallel with the power transmission shaft 5 and is positioned on the radial outer side of the power transmission shaft 5, one end, far away from the third rotating shaft 4, of the auxiliary speed change output shaft 6 penetrates out of the second box body to form a power output end, a plurality of auxiliary speed change driven gears are arranged on the auxiliary speed change output shaft 6 in a one-to-one correspondence mode, a plurality of meshing sleeves are arranged on the auxiliary speed change output shaft 6 at intervals in a one-to-one correspondence mode, each meshing sleeve is close to one auxiliary speed change driven gear, is slidably arranged on the auxiliary speed change output shaft 6 and can slide along the axial direction of the auxiliary speed change output shaft 6, the auxiliary speed change driven gears are movably connected with the auxiliary speed change output shaft 6 through the meshing sleeves arranged close to the auxiliary speed change driven gears, and the auxiliary speed change driven gears are meshed with the power transmission gears arranged opposite to the auxiliary speed change driven gears.

In this embodiment, as shown in fig. 1, fig. 2, and fig. 4, in this embodiment, a second case is further disposed in the multi-gear transmission device, so that the multi-gear transmission device includes the first case and the second case, and the plurality of rotating shafts are respectively disposed in the two cases, the first case can be used as a main transmission area, the second case can be used as a sub-transmission area, and different power transmission combination modes are formed by adjusting the gear engagement condition mounted on the rotating shafts, so that the multi-gear transmission device of this embodiment has multiple output speeds, which is beneficial to shortening the rotating shafts for mounting the gears, reducing the length of each case, and improving the compactness and the reliability of operation of the multi-gear transmission device; when the multi-gear speed change device in the embodiment is installed on a tractor, the length size of the chassis is further reduced, and the problem that the wheelbase is difficult to control due to the fact that the chassis is too long is avoided.

In this embodiment, as shown in fig. 1, 2 and 4, two ends of the first rotating shaft 1, the idler shaft 3, the second rotating shaft 2, the third rotating shaft 4, the power transmission shaft 5 and the auxiliary transmission output shaft 6 are respectively supported by bearings or bearing seats, the bearings or bearing seats for supporting two ends of the first rotating shaft 1, the idler shaft 3, the second rotating shaft 2 and the third rotating shaft 4 are fixed on the first box body, and the bearings or bearing seats for supporting two ends of the power transmission shaft 5 and the auxiliary transmission output shaft 6 are fixed on the second box body; in this embodiment, the first and second cases may be configured in various configurations, and the first and second cases are not illustrated in this embodiment.

In one embodiment of the present invention, as shown in fig. 1 and 4, the multi-speed transmission further includes:

and the input end of the crawling gear transmission mechanism is in transmission connection with the output end of the rotating shaft III 4, and the output end of the crawling gear transmission mechanism is in transmission connection with the input end of the power transmission shaft 5.

In this embodiment, as shown in fig. 1 and 4, by providing the crawling gear transmission mechanism, the input end of the power transmission shaft 5 is in transmission connection with the output end of the rotating shaft three 4 through the crawling gear transmission mechanism, which is beneficial to reducing the output speed of the output end of the rotating shaft three 4 through the crawling gear transmission mechanism, so that the multi-gear transmission device can meet the working condition requirement of operation at an extremely low driving speed.

In one embodiment of the present invention, as shown in fig. 1 and 4, a creeper gear transmission includes:

the crawling gear power input gear 45 is arranged at the power output end of the rotating shaft III 4;

the crawling gear rotating shaft 8 is horizontally and rotatably arranged between the second box body and the first box body in parallel with the rotating shaft III 4, and the crawling gear rotating shaft 8 is positioned on the radial outer side of the rotating shaft III 4;

the first crawling gear driven gear 80 is arranged on the crawling gear rotating shaft 8 opposite to the crawling gear power input gear 45 and is meshed with the crawling gear power input gear 45;

the crawling gear driving gear 81 is arranged on the crawling gear rotating shaft 8 in parallel with the crawling gear driven gear I80;

the middle power transmission shaft 7 is coaxially arranged with the rotating shaft III 4, one end of the middle power transmission shaft 7 is movably connected with the rotating shaft III 4, the auxiliary variable-speed output shaft 6 is coaxially arranged with the rotating shaft III 4, and the other end of the middle power transmission shaft 7 is movably connected with the auxiliary variable-speed output shaft 6;

the second crawling gear driven gear 70 is arranged opposite to the crawling gear driving gear 81 and is rotatably installed on the intermediate power transmission shaft 7, and the second crawling gear driven gear 70 is meshed with the crawling gear driving gear 81;

the first hanging gear 46 is arranged on the power output end of the third rotating shaft 4 and is positioned at the rear end of the crawling gear power input gear 45;

the second meshing sleeve 9 is slidably mounted between the second crawling gear driven gear 70 and the first hanging gear 46 and can slide along the axial direction of the third rotating shaft 4, the second crawling gear driven gear 70 can be movably connected with the first middle power transmission shaft 7 through the second meshing sleeve 9, the middle power transmission shaft 7 can be movably connected with the first hanging gear 46 through the second meshing sleeve 9, and one end of the middle power transmission shaft 7 is movably connected with the third rotating shaft 4 through the second meshing sleeve 9;

a creep speed output gear 71, which is parallel to the second creep speed driven gear 70, is mounted on the intermediate power transmission shaft 7.

In this embodiment, as shown in fig. 1 and 4, the second crawling gear driven gear 70 can be movably coupled to the intermediate power transmission shaft 7 through the second meshing sleeve 9, and the intermediate power transmission shaft 7 can be movably coupled to the first hitching gear 46 through the second meshing sleeve 9, so that the second crawling gear driven gear 70 can be movably coupled to the intermediate power transmission shaft 7 through sliding the second meshing sleeve 9, or the intermediate power transmission shaft 7 can be movably coupled to the first hitching gear 46, which is beneficial to realizing power output of different gears, so that the multi-gear transmission device has a plurality of different output speeds, and the speed change capability of the multi-gear transmission device is improved.

In this embodiment, as shown in fig. 1 and 4, the intermediate power transmission shaft 7 and the third rotating shaft 4 in this embodiment are coaxially disposed, a cylindrical connecting protrusion is disposed at a right end of the third rotating shaft 4, a mounting groove is disposed at a left end of the intermediate power transmission shaft 7 opposite to the connecting protrusion, and the connecting protrusion extends into the mounting groove in a rotating manner, so that the intermediate power transmission shaft 7 is rotatably connected with the third rotating shaft 4; a first hanging meshing gear 90 is arranged at the left end of the middle power transmission shaft 7, and a second meshing sleeve 9 is sleeved on the outer side of the first hanging meshing gear 90 in a sliding manner; further, the first hitching gear 46 in this embodiment is provided with a first external spline hub 461 engaged with a second meshing sleeve 9, the outer diameter of the first external spline hub 461 is equal to that of the first hitching meshing gear 90, the second meshing sleeve 9 slides leftwards, the second meshing sleeve 9 is engaged with the first external spline hub 461 of the first hitching meshing gear 90 and the first hitching gear 46, the intermediate power transmission shaft 7 is connected with the third rotating shaft 4, the intermediate power transmission shaft 7 and the third rotating shaft 4 can synchronously rotate, and the second crawling gear driven gear 70 idles relative to the intermediate power transmission shaft 7. Furthermore, a second external spline hub 701 is arranged at the left end of the second crawling gear driven gear 70 in the embodiment, a second meshing sleeve 9 slides rightwards, the second meshing sleeve 9 is meshed with the second external spline hub 701 which is used for hanging the first meshing gear 90 and the second crawling gear driven gear 70, the second crawling gear driven gear 70 is connected with the intermediate power transmission shaft 7, the second crawling gear driven gear 70 can synchronously rotate with the intermediate power transmission shaft 7, and the intermediate power transmission shaft 7 can rotate relative to the third rotating shaft 4; in addition, the crawling gear transmission mechanism in the embodiment can be arranged in other structures.

In one embodiment of the present invention, as shown in fig. 1 and 4, the plurality of power transmission gears includes a first power transmission gear 51 and a second power transmission gear 52 which are installed at intervals on the power transmission shaft 5;

the plurality of auxiliary transmission driven gears comprise a first auxiliary transmission driven gear 60 and a second auxiliary transmission driven gear 61 which are arranged on the auxiliary transmission output shaft 6 at intervals, and the plurality of first meshing sleeves comprise a first meshing sleeve 62 and a second meshing sleeve 63 which are arranged on the auxiliary transmission output shaft 6 at intervals; the first auxiliary transmission driven gear 60 is meshed with the first power transmission gear 51, the second auxiliary transmission driven gear 61 is meshed with the second power transmission gear 52, the first auxiliary transmission driven gear 60 is movably connected with the auxiliary transmission output shaft 6 through a first meshing sleeve 62, the crawling gear output gear 71 is also movably connected with the auxiliary transmission output shaft 6 through a first meshing sleeve 62, and the second auxiliary transmission driven gear 61 is movably connected with the auxiliary transmission output shaft 6 through a second meshing sleeve 63;

the power transmission shaft 5 is also provided with a sub-transmission power input gear 50 facing the creep speed output gear 71, and the sub-transmission power input gear 50 is meshed with the creep speed output gear 71.

In the present embodiment, as shown in fig. 1 and 4, the first counter driven gear 60 is movably coupled to the first counter output shaft 6 through the first meshing sleeve 62, the creep speed output gear 71 is also movably coupled to the second counter output shaft 6 through the first meshing sleeve 62, and the second counter driven gear 61 is movably coupled to the second counter output shaft 6 through the second meshing sleeve 63, which is beneficial to realizing different transmission modes of rotational power by controlling the first meshing sleeve 62 and the second meshing sleeve 63 respectively, so that the multi-gear transmission device has multiple different output speeds, and the transmission capability of the multi-gear transmission device is improved; in addition, the sub-transmission power input gear 50 meshes with the creep speed output gear 71, facilitating the transmission of the output power of the creep speed gear transmission mechanism to the power transmission shaft 5. Further, the number of the power transmission gears and the auxiliary transmission driven gears in the embodiment can be adjusted according to requirements.

In this embodiment, as shown in fig. 1 and 4, a second hanging meshing gear 621 is installed on the left end of the auxiliary transmission output shaft 6, and the first meshing sleeve 62 is slidably sleeved on the outer side of the second hanging meshing gear 621; further, a second hanging gear 72 is sleeved at the right end of the crawling gear output gear 71 in the embodiment, an external spline hub is arranged at the right end of the crawling gear output gear 71, an internal spline hub is arranged in the second hanging gear 72, and the internal spline hub of the second hanging gear 72 is connected with the external spline hub of the crawling gear output gear 71; in addition, a third external spline hub which is used for being meshed with the first meshing sleeve first 62 is arranged on the second hanging gear 72 in the embodiment, the outer diameter of the third external spline hub is equal to that of the second hanging gear 621, the first meshing sleeve first 62 slides leftwards, the first meshing sleeve first 62 is meshed with the third external spline hub of the second hanging gear 621 and the second hanging gear 72, the intermediate power transmission shaft 7 is connected with the auxiliary speed change output shaft 6, the intermediate power transmission shaft 7 and the auxiliary speed change output shaft 6 can synchronously rotate, and the auxiliary speed change driven gear first 60 idles relative to the intermediate power transmission shaft 7. Further, in the present embodiment, a fourth external spline hub is provided at the left end of the first counter driven gear 60, the first meshing sleeve 62 is slid rightward, the first meshing sleeve 62 is meshed with the fourth external spline hub that connects the second meshing gear 621 and the first counter driven gear 60, the first counter driven gear 60 is coupled to the counter output shaft 6, the first counter driven gear 60 can rotate synchronously with the counter output shaft 6, and the counter output shaft 6 can rotate relative to the intermediate power transmission shaft 7.

In this embodiment, as shown in fig. 1 and 4, a third hooking meshing gear 631 is mounted on the auxiliary transmission output shaft 6 near the left end of the second auxiliary transmission driven gear 61, the first second meshing sleeve 63 is slidably sleeved outside the third hooking meshing gear 631, a fifth external spline hub is disposed at the left end of the second auxiliary transmission driven gear 61, the first second meshing sleeve 63 slides to the right, the first second meshing sleeve 63 is meshed with the third hooking meshing gear 631 and the fifth external spline hub of the third hooking meshing gear 631, the second auxiliary transmission driven gear 61 is coupled with the auxiliary transmission output shaft 6, and the second auxiliary transmission driven gear 61 can be coupled with the auxiliary transmission output shaft 6 to rotate synchronously; when the first second meshing sleeve 63 slides leftwards, the first second meshing sleeve 63 is meshed with a fifth external spline hub of the third hanging meshing gear 631, the second auxiliary transmission driven gear 61 is disconnected with the auxiliary transmission output shaft 6, and the second auxiliary transmission driven gear 61 can idle relative to the auxiliary transmission output shaft 6; further, the left end of the second meshing sleeve 63 in this embodiment is provided with a stop ring for limiting the second meshing sleeve 63 and the hanging meshing gear three 631.

In one embodiment of the present invention, as shown in fig. 1 and 2, the plurality of gear driving gears include a reverse driving gear 10, a first gear driving gear 12 and a second gear driving gear 15 which are installed on the first rotating shaft 1 at intervals;

the plurality of driven transmission gears comprise a first-gear transmission gear 20, a second-gear transmission gear 21 and a third-gear transmission gear 22 which are arranged on the second rotating shaft 2 at intervals, the first-gear transmission gear 20 is in transmission connection with the reverse gear driving gear 10, the second-gear transmission gear 21 is meshed with the first-gear driving gear 12, and the third-gear transmission gear 22 is meshed with the second-gear driving gear 15;

the driven gears of the plurality of gears comprise a first-gear driven gear 40, a second-gear driven gear 42 and a third-gear driven gear 44 which are arranged on the rotating shaft III 4 at intervals, the first-gear driven gear 40 is meshed with the first-gear transmission gear 20, the second-gear driven gear 42 is meshed with the second-gear transmission gear 21, and the third-gear driven gear 44 is in transmission connection with the third-gear transmission gear 22.

In the present embodiment, as shown in fig. 1 and 2, a first rotating shaft 1 is provided with a reverse driving gear 10, a first driving gear 12 and a second driving gear 15 controlled by a wet clutch, a second rotating shaft 2 is provided with a first transmission gear 20, a second transmission gear 21 and a third transmission gear 22, and a third rotating shaft 4 is provided with a first driven gear 40, a second driven gear 42 and a third driven gear 44 controlled by a gear synchronizer.

In this embodiment, as shown in fig. 1 and fig. 2, the wet clutches in this embodiment are a first wet clutch 11, a second wet clutch 13 and a third wet clutch 14, the reverse driving gear 10 is rotatably mounted on the first rotating shaft 1 through a bearing and movably coupled with the first rotating shaft 1 through the first wet clutch 11, the first wet clutch 11 has a first friction plate as a friction plate, the reverse driving gear 10 is movably coupled with the first rotating shaft 1 through the first friction plate, one side of the reverse driving gear 10 close to the first wet clutch 11 is provided with a first external spline hub, the first external spline hub extends into the first wet clutch 11 and is movably coupled with an internal spline of the first friction plate, the first wet clutch 11 is further provided with a first piston 111 for pushing the first friction plate, the first piston 111 is driven by hydraulic oil, when the first piston 111 is driven by the hydraulic oil to push the first friction plate, the first external spline hub is connected with the internal spline of the first friction plate, so that the reverse gear driving gear 10 is connected with the first rotating shaft 1, when hydraulic oil does not drive the first piston 111 to push the first friction plate, the first piston 111 is reset under the extrusion action of a belleville spring in the first wet clutch 11, the first external spline hub is disconnected with the internal spline of the first friction plate, and the reverse gear driving gear 10 can idle relative to the first rotating shaft 1, so that the reverse gear driving gear 10 and the first wet clutch 11 are movably connected and have two working conditions of synchronous rotation with the first rotating shaft 1 and idle rotation relative to the first rotating shaft 1. Furthermore, the first gear driving gear 12 in this embodiment is rotatably mounted on the first rotating shaft 1 through a bearing and movably coupled with the first rotating shaft 1 through a second wet clutch 13, a second piston 131 for pushing a friction plate is further disposed in the second wet clutch 13, and the structure and the working principle of the second wet clutch 13 are the same as those of the first wet clutch 11; further, the second gear driving gear 15 in this embodiment is rotatably mounted on the first rotating shaft 1 through a bearing and movably coupled with the first rotating shaft 1 through the second wet clutch 13, a third piston 141 for pushing a friction plate is further disposed in the third wet clutch 14, and the structure and the working principle of the third wet clutch 14 are the same as those of the first wet clutch 11.

Further, as shown in fig. 1 and 2, the gear synchronizer in this embodiment includes a first gear synchronizer 41 and a second gear synchronizer 43, the first gear driven gear 40 is rotatably mounted on the third shaft 4 through a bearing and movably coupled with the third shaft 4 through the first gear synchronizer 41, the first gear synchronizer 41 is specifically a bilateral synchronizer, the first gear synchronizer 41 includes a left synchronizer and a right synchronizer, a first hooking spline hub is provided on a right end of the first gear driven gear 40, the first hooking spline hub of the first gear driven gear 40 is movably coupled with the left synchronizer, a second hooking spline hub is provided on a left end of the second gear driven gear 42, the second hooking spline hub of the second gear driven gear 42 is movably coupled with the right synchronizer, the left synchronizer and the right synchronizer respectively have a left hooking position and a right hooking position, when the left synchronizer is hooked, the first gear synchronizer 41 is coupled with the first hooking hub of the first gear driven gear 40, when the left synchronizer is in right-hand engagement, the first gear synchronizer 41 is disconnected with the first coupling spline hub of the first gear driven gear 40; when the right synchronizer is engaged, the first-gear synchronizer 41 is coupled to the second coupling spline hub of the first-gear driven gear 40, and when the right synchronizer is engaged, the first-gear synchronizer 41 is decoupled from the second coupling spline hub of the first-gear driven gear 40. Therefore, the first-gear driven gear 40 and the second-gear driven gear 42 are movably coupled with the first-gear synchronizer 41, and two working conditions of synchronous rotation with the rotating shaft three 4 and idling relative to the rotating shaft three 4 are provided respectively. Further, the first gear synchronizer 41 in the present embodiment may also be replaced by two independent half-side synchronizers.

In the present embodiment, as shown in fig. 1 and fig. 2, the second gear synchronizer 43 is specifically a half-side synchronizer, a third hooking spline hub is arranged at the left end of the third gear driven gear 44, the second gear synchronizer 43 has a left-hooking position and a right-hooking position, when the second gear synchronizer 43 is in right-hooking, the second gear synchronizer 43 is connected with the third hooking spline hub of the third gear driven gear 44, and the second gear synchronizer 43 rotates synchronously with the third rotating shaft 4; when the second gear synchronizer 43 is left-engaged, the second gear synchronizer 43 is decoupled from the third engagement spline hub of the third gear driven gear 44, and the third gear driven gear 44 can idle relative to the third rotating shaft 4. Therefore, the active coupling of the third driven gear 44 and the second gear synchronizer 43 has two working conditions of synchronous rotation with the rotating shaft three 4 and idle rotation relative to the rotating shaft three 4.

In the present embodiment, as shown in fig. 1 and 4, bearings or bearing blocks at both ends of the intermediate power transmission shaft 7 and the creep gear rotating shaft 8 are supported, and the bearings or bearing blocks for supporting both ends of the intermediate power transmission shaft 7 and the creep gear rotating shaft 8 are fixed between the first case and the second case.

In the present embodiment, as shown in fig. 1 to 4, the multi-gear transmission device can realize 36 forward gears and 18 reverse gears in total by various transmission combination modes, and when the multi-gear transmission device is used for a tractor, various tractor operations from low speed to high speed are effectively satisfied. In addition, the output end of the auxiliary transmission output shaft 6 in the embodiment is provided with a bevel gear, and the bevel gear is in transmission connection with the reversing mechanism.

It should be noted that, in this embodiment, the specific structures of the wet clutch, the gear synchronizer, and the meshing sleeve, and the installation manners of the wet clutch, the gear synchronizer, and the meshing sleeve respectively and the rotating shaft may refer to the prior art in the field, and the structures of the gears respectively movably coupled to the wet clutch, the gear synchronizer, and the meshing sleeve and controlled by the wet clutch, the gear synchronizer, and the meshing sleeve may also refer to the prior art in the field, and in addition, how to control the gears corresponding to the wet clutch, the gear synchronizer, and the meshing sleeve may also refer to the prior art in the field, which is not described in detail in this embodiment.

In one embodiment of the present invention, as shown in fig. 1 to 3, the multi-speed transmission further includes:

the idler shaft 3 is horizontally and rotatably arranged in the first box body in parallel to the rotating shaft 1 and located on the radial outer side of the rotating shaft 1, an idler gear 30 is arranged on the idler shaft 3 and is opposite to the reverse gear driving gear 10, the idler gear 30 is located in the first box body, and the idler gear 30 is meshed with a transmission driven gear and the reverse gear driving gear 10 which are opposite to each other.

In the present embodiment, as shown in fig. 1 to 3, an idler shaft 3 is provided, an idler gear 30 is mounted on the idler shaft 3 opposite to the reverse driving gear 10, and the idler gear 30 is engaged with a transmission driven gear and the reverse driving gear 10 which are opposite to each other, so that the rotation directions of the gear transmission gear which is opposite to each other and the reverse driving gear 10 are the same, and the rotation power of the reverse driving gear 10 is transmitted in the same direction. In addition, the idler gear 30 in this embodiment is rotatably mounted on the idler shaft 3 through a bearing.

According to one embodiment of the utility model, as shown in fig. 3, the first rotating shaft 1 and the second rotating shaft 2 are arranged in parallel in the front and back direction in the horizontal direction, the idler shaft 3 is positioned at the upper side between the first rotating shaft 1 and the second rotating shaft 2, the third rotating shaft 4 and the second rotating shaft 2 are arranged in parallel in the up and down direction in the vertical direction, and the third rotating shaft 4 is positioned at the lower side of the second rotating shaft 2.

In this embodiment, as shown in fig. 3, the first rotating shaft 1 and the second rotating shaft 2 are arranged in parallel in the front and back direction of the horizontal direction, and the first rotating shaft 1 and the second rotating shaft 2 are arranged in the front and back direction, so that the utilization rate of the transverse space is increased, the size of the first box body in the front and back direction is also increased, the transverse section of the first box body is increased, and the structural strength of the first box body is also improved; furthermore, the idler shaft 3 is located on the upper side between the first rotating shaft 1 and the second rotating shaft 2, and the third rotating shaft 4 is located on the lower side of the second rotating shaft 2, so that arrangement among the shafts is more compact, and the production cost of the first box body is reduced. It should be noted that, in the present embodiment, the arrangement manner of the first rotating shaft 1, the idler shaft 3, the second rotating shaft 2 and the third rotating shaft 4 is based on fig. 3; in the present embodiment, in order to fully show the first-gear transmission gear 20, the second-gear transmission gear 21 and the third-gear transmission gear 22 mounted on the second rotating shaft 2 in fig. 1 and 2, the second rotating shaft 2 is drawn below the first rotating shaft 1, and substantially, the second rotating shaft 2 is located at one side of the first rotating shaft 1 in the horizontal direction; further, in the present embodiment, for the purpose of the complete idler shaft 3 and idler gear 30 in fig. 1 and 2, the idler shaft 3 is drawn above the first rotating shaft 1, and in essence, the idler shaft 3 is located above the first rotating shaft 1 and the second rotating shaft 2. Further, the arrangement of the rotating shaft one 1, the idler shaft 3, the rotating shaft two 2 and the rotating shaft three 4 can also be integrally rotated or adjusted to form other suitable arrangements on the basis of the multi-gear speed changing device shown in fig. 3 in this embodiment.

In one embodiment of the present invention, as shown in fig. 1 and 2, the multi-speed transmission further includes:

and the third-gear auxiliary transmission gear 23 is arranged on the second rotating shaft 2 and is positioned at the rear end of the third-gear transmission gear 22, and the third-gear driven gear 44 is meshed with the third-gear auxiliary transmission gear 23.

In the embodiment, as shown in fig. 1 and fig. 2, the third-gear auxiliary transmission gear 23 is mounted on the second rotating shaft 2, the third-gear auxiliary transmission gear 23 is engaged with the third-gear driven gear 44, and the third-gear driven gear 44 transmits power to the third-gear driven gear 44 through the third-gear auxiliary transmission gear 23, so that compared with the case that the third-gear transmission gear 22 is simultaneously engaged with the second-gear driving gear 15 and the third-gear driven gear 44, resistance generated by engagement of the third-gear transmission gear 22 is reduced, which is beneficial to improving the rotating speed obtained by the third-gear driven gear 44, and is further beneficial to improving the maximum rotating speed of the multi-gear transmission device.

In this embodiment, as shown in fig. 1 and fig. 2, a first oil path is arranged in the first rotating shaft 1, an oil inlet end of the first oil path is used for being communicated with an oil supply system, the first oil path extends along the length direction of the first rotating shaft 1, a control oil cavity in the wet clutch is respectively communicated with an oil outlet end of the first oil path through a first oil inlet branch, and a first proportional electromagnetic control valve for controlling the first oil inlet branch to be switched on and off is respectively connected to the first oil inlet branch.

In this embodiment, as shown in fig. 1 and 2, the first oil inlet branch is connected to the first proportional electromagnetic control valve respectively, so that the first oil inlet branch can be controlled to be switched on and switched off by controlling the switching-on and switching-off conditions of the first proportional electromagnetic control valve, the oil inlet condition of the wet clutch is conveniently controlled, the control reliability is improved, and the control of the corresponding gear through the wet clutch is facilitated.

Furthermore, the oil supply system in this embodiment belongs to the prior art, and the first oil path in this embodiment is provided with four, and the first oil path can also be provided with three and the like according to the needs; in addition, it should be noted that, in this embodiment, the first electromagnetic control valve is not illustrated, and in this embodiment, the existing electromagnetic control valves are respectively adopted for the first electromagnetic control valve, and the installation manner and control of the first electromagnetic control valve may refer to the existing electromagnetic control valves, which are not described herein again.

Further, in the present embodiment, as shown in fig. 1 and fig. 2, the first rotating shaft 1, the second rotating shaft 2, and the third rotating shaft 4 are all in a stepped cylindrical structure, so that a plurality of gears are respectively mounted on the first rotating shaft 1, the second rotating shaft 2, and the third rotating shaft 4; in addition, the specific structure of the first rotating shaft 1, the second rotating shaft 2 and the third rotating shaft 4 in the embodiment can be various.

In addition, the present embodiment provides a tractor including:

a frame assembly;

in the multi-gear speed change device, the multi-gear speed change device is arranged on the rack assembly.

In this embodiment, the above-mentioned multi-gear transmission device is installed on a frame assembly in a tractor, because the multi-gear transmission device is provided with a first rotating shaft 1, a second rotating shaft 2 and a third rotating shaft 4 in a first box body in parallel, and is provided with gear driving gears respectively controlled by wet clutches at intervals on the first rotating shaft 1, a plurality of transmission driven gears are fixedly installed on the second rotating shaft 2, and a plurality of gear driven gears respectively controlled by a gear synchronizer are provided on the third rotating shaft 4, the corresponding gears can be controlled by controlling the wet clutches and the gear synchronizers, so as to form different transmission combination modes, so that the output end of the third rotating shaft 4 has a plurality of output speeds, thereby realizing multi-speed switching and output, and being convenient for meeting the requirements of different output speeds; furthermore, a plurality of gears for realizing speed change are respectively arranged on the first rotating shaft 1, the second rotating shaft 2 and the third rotating shaft 4, so that the rotating shafts for mounting the gears are favorably shortened, the length size of the first box body is favorably reduced, the production cost of the first box body is reduced, and the compactness and the operation reliability of the multi-gear speed change device can be improved; in addition, the length and the size of the chassis are reduced, and the problem that the wheelbase is difficult to control due to the fact that the chassis is too long is avoided. It should be noted that, the frame assembly in this embodiment is not illustrated, the multi-gear transmission device in this embodiment is a transmission, and the manner in which the multi-gear transmission device is mounted on the frame assembly may refer to the manner in which the transmission is mounted on the frame assembly in a tractor in the prior art, which is not described herein again.

In addition, in addition to the technical solutions disclosed in the present embodiment, for the wet clutch, the oil supply system, the proportional electromagnetic control valve, the meshing sleeve, the tractor assembly, other structures of the tractor, the working principle thereof, and the like in the present invention, reference may be made to conventional technical solutions in the present technical field, which are not the gist of the present invention, and the present invention is not set forth herein in detail.

In the present invention, the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.

In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," 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 application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A multiple speed transmission, comprising:

a first box body;

2. The multiple speed transmission as claimed in claim 1, further comprising:

3. The multiple speed transmission as claimed in claim 2, further comprising:

4. The multiple speed transmission of claim 3, wherein said creeper gear drive mechanism comprises:

5. The multiple speed transmission as claimed in claim 4, wherein said plurality of power transmission gears includes a first power transmission gear and a second power transmission gear mounted on said power transmission shaft at intervals;

6. The multi-speed transmission as claimed in claim 1, wherein the plurality of speed drive gears includes a reverse drive gear, a first speed drive gear and a second speed drive gear mounted on the first shaft at intervals;

7. The multiple speed transmission as claimed in claim 6, further comprising:

8. The multi-speed transmission according to claim 7, wherein the first rotating shaft and the second rotating shaft are arranged in parallel in the front-rear direction in the horizontal direction, the idler shaft is located on the upper side between the first rotating shaft and the second rotating shaft, the third rotating shaft and the second rotating shaft are arranged in parallel in the vertical direction in the up-down direction, and the third rotating shaft is located on the lower side of the second rotating shaft.

9. The multiple speed transmission as claimed in claim 6, further comprising:

10. A tractor, comprising:

a frame assembly;

the multiple speed transmission of any one of claims 1 to 9, mounted on the frame assembly.