CN113653772A

CN113653772A - Power shift transmission, transmission system and engineering machinery

Info

Publication number: CN113653772A
Application number: CN202111110934.7A
Authority: CN
Inventors: 李通响; 葛敬广; 陈硕
Original assignee: Suote Transmission Equipment Co Ltd
Current assignee: Suote Transmission Equipment Co Ltd
Priority date: 2021-09-18
Filing date: 2021-09-18
Publication date: 2021-11-16

Abstract

The invention provides a power shift transmission, a transmission system and engineering machinery, comprising: the first countershaft is provided with a first fixed gear and a first movable gear and a second movable gear which are positioned on two sides of the first fixed gear; the second countershaft and the third countershaft are sequentially arranged in parallel, a second fixed gear, a third movable gear and a fourth movable gear are arranged on the second countershaft, and a third fixed gear, a fifth movable gear and a sixth movable gear are arranged on the third countershaft; an idler pulley; six clutches; and the output shaft is provided with a fourth fixed gear. The optimal power gear shifting scheme of six forward gears and three reverse gears is realized only by arranging the transmission consisting of five shafts and thirteen gears, the structure is simple, and the space is saved.

Description

Power shift transmission, transmission system and engineering machinery

Technical Field

The invention relates to the technical field of mechanical gearboxes, in particular to a power gear shifting transmission.

Background

When working, the engineering machinery or vehicles such as wheel loaders, heavy vehicles, tractors, etc. need to change the driving direction, and in different working modes, need different speeds and traction forces, which all need a gearbox to realize the functions. The wheel loader has poor working conditions, needs a gearbox to reliably transmit larger torque, and has higher requirements on the design level of the gearbox.

At present, most of the automatic gearbox products for engineering machinery such as a loader, a land leveler and the like in China adopt a parallel shaft type structure, adopt six shafts and thirteen gears, and are provided with a gearbox consisting of a single-turbine torque converter, so that gear conversion of six forward gears and three backward gears can be realized, the gears of the whole gearbox are more, and the gearbox can adapt to various working condition modes.

However, in a transmission capable of realizing gear shifting of six forward gears and three reverse gears, a transmission formed by six shafts and thirteen gears in the prior art is complex in structure, so that the transmission box is large in size and large in occupied space.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defects of large volume and large occupied space of the transmission due to the complex structure of the transmission in the prior art.

To this end, the invention provides a powershift transmission comprising:

the first countershaft is provided with a first fixed gear and a first movable gear and a second movable gear which are positioned on two sides of the first fixed gear;

the first fixed gear, the second fixed gear and the third movable gear are meshed in sequence, the first movable gear, the steering idler gear and the third movable gear are meshed in sequence, and the second movable gear, the fourth movable gear and the fifth movable gear are meshed in sequence;

a first clutch, a second clutch, a third clutch, a fourth clutch and a fifth clutch, wherein the first clutch is connected between the first fixed gear and the first movable gear, the second clutch is connected between the first fixed gear and the second movable gear, the third clutch is connected between the second fixed gear and the third movable gear, the fourth clutch is connected between the second fixed gear and the fourth movable gear, and the fifth clutch is connected between the third fixed gear and the fifth movable gear;

and the output shaft is provided with a fourth fixed gear, and the fourth fixed gear is meshed with the fifth movable gear.

Optionally, the steering idler is rotatably disposed on an idler shaft.

Optionally, the fourth movable gear is a first duplicate gear, the second movable gear is meshed with inner side teeth of the first duplicate gear, and the fifth movable gear is meshed with outer side teeth of the first duplicate gear.

Optionally, a sixth loose gear is further disposed on the third countershaft, the sixth loose gear being located on the other side of the third fixed gear, the third loose gear meshing with the sixth loose gear, further comprising: a sixth clutch connected between the third fixed gear and the sixth moving gear.

Optionally, the third loose gear is a second duplicate gear, the steering idler gear is meshed with inner side teeth of the second duplicate gear, and outer side teeth of the second duplicate gear are meshed with the sixth loose gear.

Optionally, the fifth movable gear is a third dual gear, the outer teeth of the first dual gear are meshed with the inner teeth of the third dual gear, and the outer teeth of the third dual gear are meshed with the fourth fixed gear.

Optionally, the first movable gear, the third movable gear and the sixth movable gear are located on the same side.

Optionally, the second, fourth and fifth loose gears are located on the same side.

The invention further provides a transmission system comprising the power shifting transmission in any scheme.

The invention also provides engineering machinery comprising the transmission system in any scheme.

The technical scheme of the invention has the following advantages:

the invention provides a power shifting transmission, which provides a group of new transmission schemes, realizes the power shifting schemes of at least three forward gears and three reverse gears through the power transmission among shafts, gears and clutches, and can realize the steering change of an output shaft, namely the mutual conversion of the forward gears and the reverse gears by arranging a steering idle gear between certain two gears. The power gear shifting scheme of at least three forward gears and three backward gears can be realized only by the transmission consisting of the five shafts, the fixed gears and the movable gears, and compared with the transmission which also realizes multi-gear power gear shifting, the multi-gear power gear shifting transmission has the advantages of simple structure and space saving.

Meanwhile, the duplicate gear is arranged on part of the movable gears, so that the speed ratios of other gears can be adjusted simultaneously under the condition that the speed ratio of part of the gears is unchanged, and the positions of shafts do not need to be adjusted, so that the gearbox shells with different speed ratios can be used universally.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic transmission diagram (three forward gears and three reverse gears) of embodiment 1 of a powershift transmission provided by the invention;

FIG. 2 is a schematic transmission diagram (three forward gears and three reverse gears) of embodiment 2 of the powershift transmission provided by the invention;

FIG. 3 is a schematic transmission diagram (six forward and three reverse) of embodiment 3 of the powershift transmission provided by the invention;

fig. 4 is a schematic transmission diagram (six forward gears and three reverse gears) of embodiment 4 of the powershift transmission provided by the invention.

Description of reference numerals:

1. a first intermediate shaft; 2. a second intermediate shaft; 3. a third intermediate shaft; 4. an output shaft; 5. a first fixed gear; 6. a second fixed gear; 7. a third fixed gear; 8. a fourth fixed gear; 9. a first movable gear; 10. a second movable gear; 11. a third movable gear; 12. a fourth loose gear; 13. a fifth movable gear; 14. a sixth movable gear; 15. a steering idler pulley; 16. a first clutch; 17. a second clutch; 18. a third clutch; 19. a fourth clutch; 20. a fifth clutch; 21. a sixth clutch; 22. a first duplicate gear; 23. a second duplicate gear; 24. a third duplicate gear.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. 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 addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Example 1

The present embodiment provides a powershift transmission with three forward gears and three reverse gears, as shown in fig. 1, comprising:

the first countershaft 1, the first loose gear 9 that sets up on the first countershaft 1 are power input end, external connection power device, and power device drive first loose gear 9 rotates.

In particular, the power plant may be an engine or other power producing device.

First fixed gear 5, fixedly connected to first countershaft 1, i.e. first fixed gear 5 can rotate with rotation of first countershaft 1, it should be noted that: the fixed connection mode can be welding, key connection and the like.

And the first movable gear 9 and the second movable gear 10 are arranged on two sides of the first fixed gear 5, and the first movable gear 9 and the second movable gear 10 are rotatably connected to the first intermediate shaft 1 through bearings, namely the first movable gear 9 and the second movable gear 10 cannot rotate along with the rotation of the first intermediate shaft 1 without limitation of other connecting structures.

The second intermediate shaft 2 and the third intermediate shaft 3 are arranged in parallel between the first intermediate shaft 1 and the subsequent output shaft 4 in sequence.

The second fixed gear 6 is fixedly connected to the second countershaft 2, i.e. the first fixed gear 5 can rotate with the rotation of the second countershaft 2, likewise fixedly connected by welding, keyed connection or the like.

And the third movable gear 11 and the fourth movable gear 12 are arranged on two sides of the second fixed gear 6, and the third movable gear 11 and the fourth movable gear 12 are rotatably connected to the second intermediate shaft 2 through bearings, namely the third movable gear 11 and the fourth movable gear 12 cannot rotate along with the rotation of the second intermediate shaft 2 without limitation of other connecting structures.

A steering idle wheel 15, arranged between the first loose gear 9 and said third loose gear 11, the steering idle wheel 15 functioning: the direction of rotation of the driven wheels on the transmission path is changed, namely the direction of rotation of the output shaft 4 passing through the transmission path of the steering idle wheel 15 is opposite to that of the output shaft 4 not passing through the transmission path of the steering idle wheel 15, so that the speed changer is provided with a forward gear and a backward gear at the same time.

The third fixed gear 7 is fixedly connected to the third countershaft 3, i.e. the third fixed gear 7 can rotate with the rotation of the third countershaft 3, likewise fixedly connected by welding, keyed connection or the like.

A fifth loose gear 13, which is arranged on one side of the third fixed gear 7, in particular, the fifth loose gear 13 is arranged on one side adapted to mesh with the fourth loose gear 12, the fifth loose gear 13 is rotatably connected to the third countershaft 3 through a bearing, i.e., the fifth loose gear 13 does not rotate with the rotation of the third countershaft 3 without limitation of other connecting structures.

Specifically, as shown in fig. 1 (the dotted line between the two gears in the figure indicates that the two gears are meshed, and fig. 2, 3, and 4 are the same), the first fixed gear 5, the second fixed gear 6, and the third fixed gear 7 are sequentially meshed, the first loose gear 9, the steering idle gear 15, and the third loose gear 11 are meshed, and the second loose gear 10, the fourth loose gear 12, and the fifth loose gear 13 are sequentially meshed.

And a first clutch 16 connected between the first fixed gear 5 and the first movable gear 9, the first clutch 16 being for engaging or disengaging the first fixed gear 5 and the first movable gear 9, the first clutch 16 being a reverse clutch.

And a second clutch 17 connected between the first fixed gear 5 and the second movable gear 10, the first clutch 16 for coupling or decoupling the first fixed gear 5 and the first movable gear 9.

And a third clutch 18 connected between the second fixed gear 6 and the third movable gear 11, the third clutch 18 being for engaging or disengaging the second fixed gear 6 and the third movable gear 11, the third clutch 18 being a forward low clutch.

And a fourth clutch 19 connected between the second fixed gear 6 and the fourth movable gear 12, the fourth clutch 19 being used to couple or decouple the second fixed gear 6 and the fourth movable gear 12.

And a fifth clutch 20 connected between the third fixed gear 7 and the fifth movable gear 13, the fifth clutch 20 being for coupling or decoupling the third fixed gear 7 and the fifth movable gear 13.

Specifically, the clutches are fixedly connected to the fixed gears, the movable gear is provided with a combining part suitable for being combined with the adjacent clutches, when any one clutch acts, the movable gear is connected with the adjacent fixed gears into a whole through the combining action of the clutches, and at the moment, the movable gear can synchronously rotate with the adjacent fixed gears.

Further, by engaging one of the first clutch 16 and the third clutch 18 and engaging one of the second clutch 17, the fourth clutch 19 and the fifth clutch 20, a three forward gear and three reverse gear transmission scheme can be achieved.

The output shaft 4 and the output shaft 4 are power output ends and are externally connected with equipment needing to be rotated, and the output shaft 4 drives the equipment needing to be rotated to rotate.

And the fourth fixed gear 8 is arranged on the output shaft 4, the fourth fixed gear 8 is meshed with the fifth movable gear 13, and the fourth fixed gear 8 is fixedly connected to the output shaft 4, namely the fourth fixed gear 8 can rotate along with the rotation of the output shaft 4, and similarly, the fixed connection mode can be welding, key connection and the like.

On the basis of the above-described embodiment, as a further limited embodiment, as shown in fig. 1 to 4, the steering idler pulley 15 is rotatably provided on an idler shaft, and specifically, the steering idler pulley 15 is rotatably coupled to the idler shaft via a bearing.

As a more limited embodiment, in addition to the above-described embodiment, as shown in fig. 1, the fourth loose gear 12 is a first double gear 22, the second loose gear 10 meshes with inner teeth of the first double gear 22, and the fifth loose gear 13 meshes with outer teeth of the first double gear 22.

Specifically, the inner teeth of the first double gear 22 are the gears on the side closer to the fourth clutch 19, and correspondingly, the outer teeth of the first double gear 22 are the gears farther from the fourth clutch 19.

Further, in practical application, the gear ratio can be changed by adjusting the gear ratio between the outside teeth of the first duplicate gear 22 and the fifth loose gear 13, so that the speed ratio of the forward gear and the backward gear passing through the transmission path of the first duplicate gear 22 can be adjusted.

The transmission path of the present embodiment shift transmission is as follows:

advancing the first gear: the third clutch 18 and the second clutch 17 are in a combined state;

the path is as follows: the gear transmission mechanism comprises a first movable gear 9, a steering idle gear 15, a third movable gear 11, a third clutch 18, a second fixed gear 6, a first fixed gear 5, a second clutch 17, a second movable gear 10, inner teeth of a first duplicate gear 22, outer teeth of the first duplicate gear 22, a fifth movable gear 13, a fourth fixed gear 8 and an output shaft 4.

And (3) forward second gear: the third clutch 18 and the fourth clutch 19 are engaged;

the path is as follows: a first loose gear 9, a steering idle gear 15, a third loose gear 11, a third clutch 18, a second intermediate shaft 2, a fourth clutch 19, external teeth of a first duplicate gear 22, a fifth loose gear 13, a fourth fixed gear 8 and an output shaft 4.

Forward third gear: the third clutch 18 and the fifth clutch 20 are in a combined state;

the path is as follows: a first loose gear 9, a steering idle gear 15, a third loose gear 11, a third clutch 18, a second fixed gear 6, a third fixed gear 7, a fifth clutch 20, a fifth loose gear 13, a fourth fixed gear 8 and an output shaft 4.

Backing off a first gear: the first clutch 16 and the second clutch 17 are in a combined state;

the path is as follows: the first movable gear 9, the first clutch 16, the first intermediate shaft 1, the second clutch 17, the second movable gear 10, the inner teeth of the first duplicate gear 22, the outer teeth of the first duplicate gear 22, the fifth movable gear 13, the fourth fixed gear 8 and the output shaft 4.

A backward second gear: the first clutch 16 and the fourth clutch 19 are engaged;

the path is as follows: the first movable gear 9, the first clutch 16, the first fixed gear 5, the second fixed gear 6, the fourth clutch 19, the outer teeth of the first duplicate gear 22, the fifth movable gear 13, the fourth fixed gear 8 and the output shaft 4.

Forward and backward three-gear: the first clutch 16 and the fifth clutch 20 are in an engaged state;

the path is as follows: a first loose gear 9, a first clutch 16, a first fixed gear 5, a second fixed gear 6, a third fixed gear 7, a fifth clutch 20, a fifth loose gear 13, a fourth fixed gear 8, and an output shaft 4.

The advantage of this embodiment is that in practical application, on the premise of not changing the structure of the transmission case, i.e. not changing the positions of the shafts, if the fourth loose gear 12 is a single gear, and it is desired to adjust the speed ratios of all the forward gears and the reverse gears simultaneously, it is necessary to adjust the gear ratios of the four pairs of gears of the second loose gear 10, the fourth loose gear 12, the fifth loose gear 13 and the fourth fixed gear 8, so as to change the transmission ratio, while this embodiment sets the fourth loose gear 12 as the first duplicate gear 22, on the premise of not changing the structure of the transmission box body, namely not changing the positions of all shafts, the gear ratios of three pairs of external teeth of the first duplicate gear 22, the fifth movable gear 13 and the fourth fixed gear 8 are only required to be adjusted to change the transmission ratio, so that the speed ratios of all forward gears and all backward gears can be adjusted at the same time, the number of teeth of the second movable gear 10 is not required to be changed, and the change of a group of gears is reduced.

Example 2

Embodiment 2 provides another powershift transmission having three forward gears and three reverse gears, and as shown in fig. 2, the powershift transmission of embodiment 2 differs from embodiment 1 described above in that:

the fifth movable gear 13 is a third double gear 24, the outer teeth of the first double gear 22 mesh with the inner teeth of the third double gear 24, and the outer teeth of the third double gear 24 mesh with the fourth fixed gear 8.

Specifically, the inner-side teeth of the third double gear 24 are the gears on the side closer to the fifth clutch 20, and correspondingly, the outer-side teeth of the third double gear 24 are the gears farther from the fifth clutch 20.

Further, compared with embodiment 1, the present embodiment is different in that: the fifth loose gear 13 is provided as a duplicate gear, i.e., the third duplicate gear 24, so the transmission path of the transmission of the present embodiment is substantially the same as that of embodiment 1, and similarly, three forward gears and three reverse gears are provided, as long as the fifth loose gear 13 in the transmission path is replaced by the inner teeth of the third duplicate gear 24 and the outer teeth of the third duplicate gear 24, so the specific transmission path can be referred to in embodiment 1.

The embodiment has the advantages that in practical application, on the premise that the structure of a transmission box body is not changed, namely the positions of all shafts are not changed, the transmission ratios of all gears can be changed by only adjusting the gear ratio of the outer side gear of the third duplicate gear 24 to the fourth fixed gear 8, the speed ratio of the forward gear and the backward gear passing through the transmission path of the third duplicate gear 24 can be adjusted, and the fourth fixed gear 8 meshed with the third duplicate gear 24 is arranged on the output shaft 4, so that the speed ratios of all the forward gears and the backward gears can be adjusted simultaneously.

Example 3

The present embodiment provides a powershift transmission with six forward gears and three reverse gears, and as shown in fig. 3, the powershift transmission of embodiment 3 is different from embodiment 1 in that it further includes the following components:

a sixth loose gear 14 provided on the third countershaft 3, the sixth loose gear 14 being located on the other side of the third fixed gear 7, the sixth loose gear 14 being in mesh with the third loose gear 11, specifically, the sixth loose gear 14 being provided on the side adapted to be in mesh with the third loose gear 11, the sixth loose gear 14 being rotatably connected to the third countershaft 3 through a bearing, i.e., the sixth loose gear 14 does not rotate with the rotation of the third countershaft 3 without limitation of other connecting structures.

And a sixth clutch 21, the sixth clutch 21 being connected between the third fixed gear 7 and the sixth movable gear 14, the sixth clutch 21 being for engaging or disengaging the third fixed gear 7 and the sixth movable gear 14, the sixth clutch 21 being a forward high-speed clutch.

Specifically, the sixth clutch 21 is fixedly connected to the third fixed gear 7, the sixth loose gear 14 is provided with a coupling portion adapted to be coupled to the adjacent sixth clutch 21, and when the sixth clutch 21 is applied, the sixth loose gear 14 is integrally connected to the adjacent third fixed gear 7 by the coupling action of the sixth clutch 21, and at this time, the sixth loose gear 14 can be rotated synchronously with the adjacent third fixed gear 7.

Further, by engaging one of the first clutch 16, the third clutch 18 and the sixth clutch 21 and engaging one of the second clutch 17, the fourth clutch 19 and the fifth clutch 20, a six-forward and three-reverse transmission scheme can be achieved.

In addition to the above embodiments, as a further limited embodiment, as shown in fig. 3, the third loose gear 11 is a second duplicate gear 23, the steering idle gear 15 meshes with the inner teeth of the second duplicate gear 23, and the outer teeth of the second duplicate gear 23 meshes with the sixth loose gear 14.

Specifically, the inner teeth of the second duplicate gear 23 are the gears on the side closer to the third clutch 18, and correspondingly, the outer teeth of the second duplicate gear 23 are the gears farther from the third clutch 18.

Further, in practical application, the gear ratio can be changed by adjusting the gear ratio between the outside teeth of the second duplicate gear 23 and the sixth loose gear 14, so that the speed ratio of the forward gear passing through the transmission path of the second duplicate gear 23 can be adjusted.

the path is as follows: the transmission comprises a first movable gear 9, a steering idle gear 15, inner teeth of a second duplicate gear 23, a third clutch 18, a second fixed gear 6, a first fixed gear 5, a second clutch 17, a second movable gear 10, inner teeth of a first duplicate gear 22, outer teeth of the first duplicate gear 22, a fifth movable gear 13, a fourth fixed gear 8 and an output shaft 4.

And (3) forward second gear: the sixth clutch 21 and the second clutch 17 are engaged;

the path is as follows: the first movable gear 9, the steering idle gear 15, the inner teeth of the second duplicate gear 23, the outer teeth of the second duplicate gear 23, the sixth movable gear 14, the sixth clutch 21, the third fixed gear 7, the second fixed gear 6, the first fixed gear 5, the second clutch 17, the second movable gear 10, the inner teeth of the first duplicate gear 22, the outer teeth of the first duplicate gear 22, the fifth movable gear 13, the fourth fixed gear 8 and the output shaft 4.

Forward third gear: the third clutch 18 and the fourth clutch 19 are engaged;

the path is as follows: a first loose gear 9, a steering idle gear 15, inner teeth of a second duplicate gear 23, a third clutch 18, a second intermediate shaft 2, a fourth clutch 19, outer teeth of a first duplicate gear 22, a fifth loose gear 13, a fourth fixed gear 8 and an output shaft 4.

And (4) forward fourth gear: the sixth clutch 21 and the fourth clutch 19 are engaged;

the path is as follows: the first movable gear 9, the steering idle gear 15, the inner teeth of the second duplicate gear 23, the outer teeth of the second duplicate gear 23, the sixth movable gear 14, the sixth clutch 21, the third fixed gear 7, the second fixed gear 6, the fourth clutch 19, the outer teeth of the first duplicate gear 22, the fifth movable gear 13, the fourth fixed gear 8 and the output shaft 4.

Forward five gears: the third clutch 18 and the fifth clutch 20 are in a combined state;

the path is as follows: a first loose gear 9, a steering idle gear 15, inner teeth of a second duplicate gear 23, a third clutch 18, a second fixed gear 6, a third fixed gear 7, a fifth clutch 20, a fifth loose gear 13, a fourth fixed gear 8 and an output shaft 4.

Forward six gears: the sixth clutch 21 and the fifth clutch 20 are in an engaged state;

the path is as follows: a first loose gear 9, a steering idle gear 15, a second duplicate gear 23 inside teeth, a second duplicate gear 23 outside teeth, a sixth loose gear 14, a sixth clutch 21, a third intermediate shaft 3, a fifth clutch 20, a fifth loose gear 13, a fourth fixed gear 8 and an output shaft 4.

The advantage of this embodiment lies in, in practical application, can change the drive ratio through only adjusting the tooth ratio of the outside tooth of second duplicate gear 23 and sixth loose gear 14, realize under the unchangeable condition of other speed ratios, adjust simultaneously and advance two grades, advance four grades and advance six grades of speed ratios, and need not adjust the position of each axle for the gearbox casing of different speed ratios can be general.

Example 4

The present embodiment provides another powershift transmission having six forward gears and three reverse gears, and as shown in fig. 4, the powershift transmission of embodiment 4 differs from that of embodiment 3 in that:

Further, compared with embodiment 3, the present embodiment is different in that: the fifth loose gear 13 is provided as a duplicate gear, i.e., the third duplicate gear 24, so the transmission path of the transmission of the present embodiment is substantially the same as that of embodiment 3, and also includes six forward gears and three reverse gears, as long as the fifth loose gear 13 in the transmission path is replaced by the inner teeth of the third duplicate gear 24 and the outer teeth of the third duplicate gear 24, so the specific transmission path can be referred to in embodiment 3.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims

1. A powershift transmission, comprising:

a first intermediate shaft (1), wherein a first fixed gear (5) and a first movable gear (9) and a second movable gear (10) which are positioned on two sides of the first fixed gear (5) are arranged on the first intermediate shaft (1), and the first movable gear (9) is in a power input structure;

the second countershaft (2) and the third countershaft (3) are sequentially arranged in parallel, a second fixed gear (6) and a third movable gear (11) and a fourth movable gear (12) which are positioned on two sides of the second fixed gear (6) are arranged on the second countershaft (2), a steering idle gear (15) is arranged between the first movable gear (9) and the third movable gear (11), a third fixed gear (7) and a fifth movable gear (13) positioned on one side of the third fixed gear (7) are arranged on the third countershaft (3), the first fixed gear (5), the second fixed gear (6) and the third fixed gear (7) are sequentially meshed, the first movable gear (9), the steering idle gear (15) and the third movable gear (11) are meshed, and the second movable gear (10), The fourth movable gear (12) and the fifth movable gear (13) are meshed in sequence;

-a first clutch (16), -a second clutch (17), -a third clutch (18), -a fourth clutch (19) and-a fifth clutch (20), said first clutch (16) being connected between said first fixed gear (5) and said first movable gear (9), -said second clutch (17) being connected between said first fixed gear (5) and said second movable gear (10), -said third clutch (18) being connected between said second fixed gear (6) and said third movable gear (11), -said fourth clutch (19) being connected between said second fixed gear (6) and said fourth movable gear (12), -said fifth clutch (20) being connected between said third fixed gear (7) and said fifth movable gear (13);

the output shaft (4) is provided with a fourth fixed gear (8), and the fourth fixed gear (8) is meshed with the fifth movable gear (13).

2. A powershift transmission according to claim 1, characterised in that the steering idler (15) is rotatably arranged on an idler shaft.

3. A powershift transmission according to claim 2, characterised in that the fourth loose gearwheel (12) is a first double gearwheel (22), the second loose gearwheel (10) meshes with the inner teeth of the first double gearwheel (22), and the fifth loose gearwheel (13) meshes with the outer teeth of the first double gearwheel (22).

4. A powershift transmission according to claim 3, wherein said third countershaft (3) is further provided with a sixth loose gear (14), said sixth loose gear (14) being located on the other side of said third fixed gear (7), said third loose gear (11) being in mesh with said sixth loose gear (14), further comprising: a sixth clutch (21), said sixth clutch (21) being connected between said third fixed gear (7) and said sixth loose gear (14).

5. The powershift transmission according to claim 4, characterized in that the third loose gearwheel (11) is a second double gearwheel (23), the idle steering wheel (15) meshing with the inner toothing of the second double gearwheel (23), the outer toothing of the second double gearwheel (23) meshing with the sixth loose gearwheel (14).

6. A powershift transmission according to claim 3, characterised in that the fifth loose gearwheel (13) is a third double gearwheel (24), the outer teeth of the first double gearwheel (22) meshing with the inner teeth of the third double gearwheel (24), the outer teeth of the third double gearwheel (24) meshing with the fourth fixed gearwheel (8).

7. Powershift transmission according to claim 4, characterized in that the first loose gearwheel (9), the third loose gearwheel (11) and the sixth loose gearwheel (14) are located on the same side.

8. Powershift transmission according to claim 4, characterized in that the second loose gearwheel (10), the fourth loose gearwheel (12) and the fifth loose gearwheel (13) are located on the same side.

9. A transmission system comprising a powershift transmission according to any one of claims 1 to 8.

10. A working machine comprising a transmission system according to claim 9.