CN114087324A

CN114087324A - Power shift gearbox and tractor

Info

Publication number: CN114087324A
Application number: CN202111431706.XA
Authority: CN
Inventors: 李兴和; 黄成�; 张迎军; 戍月升; 陈亚欢; 于珊珊
Original assignee: Guangdong Haoyun Technology Co Ltd
Current assignee: Guangdong Haoyun Technology Co Ltd
Priority date: 2021-11-29
Filing date: 2021-11-29
Publication date: 2022-02-25

Abstract

The embodiment of the invention provides a power gear shifting gearbox and a tractor, and relates to the technical field of tractors. The power gear shifting gearbox comprises a power gear shifting device, an interval gear shifting device and a power reversing device, wherein the power gear shifting device and the power reversing device are in transmission connection through a gear pair, a plurality of gear shifting clutches are arranged in the power gear shifting device, and gear shifting can be achieved under the condition that power is not interrupted by switching different gear shifting clutches and corresponding gear shifting gear sets. The power reversing device is provided with a plurality of reversing clutches, and the reversing can be realized under the condition of uninterrupted power by switching different reversing clutches to be combined with corresponding gears. The interval gear shifting device is in transmission connection with the power reversing device and is used for being connected with the rear axle, the power gear shifting gearbox can achieve the functions of power gear shifting and power reversing, multi-gear switching can be achieved, gear shifting efficiency is high, and improvement of operation efficiency and gear shifting comfort are facilitated.

Description

Power shift gearbox and tractor

Technical Field

The invention relates to the technical field of tractors, in particular to a power gear shifting gearbox and a tractor.

Background

The operation operating mode of tractor is more complicated, need switch over the gear box to corresponding fender position to the operation advantage of tractor to different operation operating modes. The gearbox of current tractor, it is various that its form of shifting for example adopt gear slide to shift gears or meshing cover to shift gears etc. but will realize that the multi-gear shifts, and most need cut off power, shift inefficiency influences the operating efficiency.

Disclosure of Invention

The invention aims to provide a power shifting gearbox and a tractor, which can realize the functions of power shifting and power reversing under the condition of not cutting off power, have high shifting efficiency and improve the working efficiency and the shifting comfort.

Embodiments of the invention may be implemented as follows:

in a first aspect, the present invention provides a power shifting transmission comprising a power shifting device, a range shifting device and a power reversing device;

the power gear shifting device comprises a first shaft, a second shaft, a first gear shifting clutch and a second gear shifting clutch, wherein the first shaft is used for being connected with an engine, a plurality of first gears are arranged on the first shaft, a plurality of second gears are arranged on the second shaft, each first gear is meshed with one second gear to form a gear shifting gear set, and the gear shifting gear set comprises a first gear shifting gear set and a second gear shifting gear set; either one of the first shifting clutch and the second shifting clutch is connected with the first shifting gear set or the second shifting gear set; in a first power gear state in which the first shifting clutch is connected to the first shifting gear set, the second shifting clutch is connectable to the second shifting gear set to switch the first power gear to a second power gear;

the power reversing device comprises a third shaft and a fourth shaft, wherein the third shaft is provided with a first reversing clutch, a second reversing clutch and a plurality of third gears, the fourth shaft is provided with a plurality of fourth gears, one part of the fourth gears are meshed with the second gears, the other part of the fourth gears are meshed with the third gears, and the third gears are meshed with the second gears; the first reversing clutch or the second reversing clutch is connected with at least one of the third gears, and when the first reversing clutch is connected with one of the third gears so that the power reversing device is in a first direction gear state, the second reversing clutch can be connected with any one of the rest third gears so that the power reversing device is switched from the first direction gear to a second direction gear;

the interval gear shifting device is in transmission connection with the fourth shaft and is used for being connected with the rear axle.

In an alternative embodiment, a plurality of shifting clutches are arranged in the power shifting device, and the first shifting clutch and the second shifting clutch are any two of the plurality of shifting clutches; the first gear shifting clutch is arranged on the first shaft or the second shaft, and the second gear shifting clutch is arranged on the first shaft or the second shaft.

In an alternative embodiment, the plurality of first gears includes a plurality of shift drive gears, the plurality of shift clutches includes a first clutch, a second clutch, a third clutch and a fourth clutch, the first clutch and the second clutch are disposed on the first shaft, and the third clutch and the fourth clutch are disposed on the second shaft; the first clutch or the second clutch is connected with the gear shifting driving gear; the plurality of second gears comprise a plurality of shifting driven gears and forward gear driving gears, and the third clutch or the fourth clutch is connected with the shifting driven gears; each gear shifting driving gear is meshed with one gear shifting driven gear to form one gear shifting gear set.

In an optional embodiment, the shift driving gear includes a first gear driving gear, a second gear driving gear, a third gear driving gear and a fourth gear driving gear, and the first gear driving gear, the second gear driving gear, the first clutch, the third gear driving gear, the second clutch and the fourth gear driving gear are sequentially disposed on the first shaft, wherein the first gear driving gear is close to the engine;

the first gear driving gear, the second gear driving gear, the third gear driving gear and the fourth gear driving gear are respectively connected with the gear shifting driven gear on the second shaft, the second gear driving gear is selectively connected with the first clutch, and the fourth gear driving gear is selectively connected with the second clutch.

In an optional embodiment, the shift driven gear includes a first-gear driven gear, a second-gear driven gear, a third-gear driven gear and a fourth-gear driven gear, and the first-gear driven gear, the third clutch, the second-gear driven gear, the fourth clutch, the third-gear driven gear, the fourth-gear driven gear and the forward gear driving gear are sequentially disposed on the second shaft;

the first-gear driven gear is meshed with the first-gear driving gear, the second-gear driven gear is meshed with the second-gear driving gear, the third-gear driven gear is meshed with the third-gear driving gear, and the fourth-gear driven gear is meshed with the fourth-gear driving gear;

the first-gear driven gear is selectively connected with the third clutch, and the third-gear driven gear is selectively connected with the fourth clutch.

In an alternative embodiment, the plurality of third gears include a reverse driven gear and a forward driven gear, the reverse driven gear, the first reversing clutch, the second reversing clutch and the forward driven gear are sequentially arranged on the third shaft, the reverse driven gear is selectively connected with the first reversing clutch, and the forward driven gear is selectively connected with the second reversing clutch;

the plurality of fourth gears comprise a reverse gear first-stage idler gear and a reverse gear second-stage idler gear, the reverse gear first-stage idler gear is meshed with the second-stage driven gear, the reverse gear second-stage idler gear is meshed with the reverse gear driven gear, and the forward gear driven gear is meshed with the forward gear driving gear.

In an alternative embodiment, the ring gear of the first reversing clutch and the ring gear of the second reversing clutch are respectively provided integrally with the third shaft; the forward gear driven gear and the reverse gear driven gear are respectively and rotatably sleeved on the third shaft.

In an alternative embodiment, the range shifting device includes a fifth shaft and a sixth shaft, the fifth shaft is provided with a fifth gear, the sixth shaft is provided with a sixth gear engaged with the fifth gear, the fifth shaft is in transmission connection with the third shaft and is located on the same axis, and the sixth shaft is used for being connected with the rear axle.

In an alternative embodiment, the fifth gear includes a plurality of range drive gears and the sixth gear includes a forward drive gear, a first synchronizer, a second synchronizer, and a plurality of range driven gears, each of the range drive gears meshing with one of the range driven gears.

In an optional embodiment, the range-shifting device further includes a seventh shaft disposed parallel to the sixth shaft, the seventh shaft is configured to be connected to a front axle, and the seventh shaft is provided with a forward driving driven gear engaged with the forward driving gear.

In an alternative embodiment, the range shift driving gear includes an L-gear driving gear, an M1-gear driving gear, an M2-gear driving gear, and an H-gear driving gear, which are sequentially disposed, and the L-gear driving gear is adjacent to the third shaft;

the range shift driven gear comprises an L-gear driven gear, an M1-gear driven gear, an M2-gear driven gear and an H-gear driven gear, the forerunner driving gear, the L-gear driven gear, the first synchronizer, the M1-gear driven gear, the M2-gear driven gear, the second synchronizer and the H-gear driven gear are sequentially arranged on the sixth shaft, and the H-gear driven gear is close to the rear axle;

the L-gear driven gear is meshed with the L-gear driving gear, the M1-gear driven gear is meshed with the M1-gear driving gear, the M2-gear driven gear is meshed with the M2-gear driving gear, and the H-gear driven gear is meshed with the H-gear driving gear.

In an alternative embodiment, the L-gear driving gear is integrally disposed with the fifth shaft, and the M1-gear driving gear, the M2-gear driving gear and the H-gear driving gear are fixedly connected to the fifth shaft, respectively.

In an alternative embodiment, the forward drive gear, the first synchronizer, and the second synchronizer are each fixedly connected to the sixth shaft; the L-gear driven gear, the M1-gear driven gear, the M2-gear driven gear and the H-gear driven gear are respectively sleeved on the sixth shaft in a rotatable manner.

In an alternative embodiment, the axes of the first, second, third and fourth axes are distributed in a spatial quadrilateral.

In an alternative embodiment, the first axis, the second axis, the third axis and the fourth axis are arranged parallel to each other, and the fifth axis is arranged parallel to the sixth axis.

In an alternative embodiment, the second, third and fourth axes are spatially "pinky" shaped.

In an optional embodiment, the power output device further comprises an output shaft, an eighth shaft and a first driven gear arranged on the eighth shaft, wherein the output shaft is connected with the eighth shaft and is positioned on the same axis;

the second gear set further comprises a first driving gear arranged on the second shaft, and the first driving gear is meshed with the first driven gear.

In an optional implementation manner, the third shaft and the fifth shaft are respectively hollow shafts, the output shaft sequentially penetrates through the third shaft and the fifth shaft, and the third shaft, the fifth shaft and the output shaft are coaxially arranged.

In an optional implementation manner, the device further comprises a pumping device, the pumping device comprises a ninth shaft and a tenth shaft which are arranged in parallel, a first pumping gear is arranged on the ninth shaft, a second pumping gear is arranged on the tenth shaft, and the first pumping gear is respectively meshed with the second pumping gear and the first driven gear.

In a second aspect, the invention provides a tractor comprising a body and a powershift gearbox according to any one of the preceding embodiments, the powershift gearbox being provided on the body.

The beneficial effects of the embodiment of the invention include, for example:

the power shifting gearbox comprises a power shifting device, an interval shifting device and a power reversing device, wherein in the power shifting device, a plurality of first gears on a first shaft are meshed with a plurality of second gears on a second shaft to form a plurality of shifting gear sets, and each shifting clutch is selectively connected with one shifting gear set; when the first shifting clutch is connected with the first shifting gear set, the second shifting clutch can be connected with the second shifting gear set to enable the first power gear to be switched to the second power gear, so that power is not interrupted in the shifting process.

In the power reversing device, the third shaft is provided with the first reversing clutch and the second reversing clutch, and when the first reversing clutch is combined with one of the third gears, the third shaft can be switched to the second reversing clutch to be combined with any one of the other third gears, namely, the third shaft is switched from the first direction gear to the second direction gear, so that the power is not interrupted in the reversing process. The power gear shifting gearbox can realize the functions of power gear shifting and power reversing, can realize multi-gear shifting, is high in gear shifting efficiency, and is favorable for improving the operation efficiency and the gear shifting comfort.

The tractor provided by the embodiment of the invention comprises the power gear shifting gearbox, and the power gear shifting gearbox has the functions of high gear shifting efficiency and power gear shifting and power reversing, so that the working efficiency and the gear shifting comfort of the tractor are improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic structural diagram of a powershift transmission according to an embodiment of the present invention;

fig. 2 is a schematic spatial layout diagram of each shaft of the powershift transmission provided by the embodiment of the invention.

Icon: 1-a power shift device; 2-range shift devices; 3-a power reversing device; 4-a pumping device; 5-a power take-off; s1 — first axis; s2 — second shaft; s3-third axis; s4-fourth axis; s5-fifth shaft; s6-sixth axis; s7-seventh axis; s8-eighth axis; s9-ninth axis; s10-tenth axis; 101-an engine; 103-an output shaft; 105-a rear axle; 107-front axle; c2 — first clutch; c4 — second clutch; c1-third clutch; c3-fourth clutch; CR-a first reversing clutch; CF-second reversing clutch; u1 — first synchronizer; u2 — second synchronizer; z1-first gear drive gear; z3-two gear drive gear; z5-three gear drive gear; z7-four gear drive gear; z2-first gear driven gear; z4-two gear driven gear; z6-three driven gears; z8-four driven gear; z9-first drive gear; z10 — first driven gear; z11-first pump power gear; z12-second pump power gear; z13-forward gear drive gear; z14-forward gear driven gear; z15-reverse first order idler; z16-reverse secondary idler; z17-reverse driven gear; Z18-L gear driving gear; Z20-M1 gear driving gear; Z22-M2 gear driving gear; Z24-H gear driving gear; Z19-L gear driven gear; the Z21-M1 gear driven gear; the Z23-M2 gear driven gear; the Z25-H gear driven gear; z26-forward drive gear; z27-front driven gear.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the 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.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.

Referring to fig. 1 and 2, the present embodiment provides a powershift transmission including a powershift apparatus 1, a range shift apparatus 2, a power reverse apparatus 3, a power take-off apparatus 5(PTO, abbreviation) and a pumping force apparatus 4. The power gear shifting device 1 and the power reversing device 3 are in transmission connection through a gear pair, and the interval gear shifting device 2 and the power reversing device 3 are in transmission connection and are arranged coaxially. Optionally, the powershift device 1 includes a first shaft S1, a second shaft S2, a first shift clutch and a second shift clutch, the first shaft S1 is configured to be connected to the engine 101, a plurality of first gears are disposed on the first shaft S1, a plurality of second gears are disposed on the second shaft S2, each first gear is meshed with one second gear to form a shift gear set, optionally, the plurality of first gears are meshed with the plurality of second gears in a one-to-one correspondence to form a plurality of shift gear sets, the plurality of shift gear sets include a first shift gear set and a second shift gear set, and either one of the first shift clutch and the second shift clutch is connected to the first shift gear set or the second shift gear set; in a first power gear state in which the first shifting clutch is connected to the first shifting gear set, the second shifting clutch can be connected to the second shifting gear set to shift the first power gear to the second power gear, that is, the power shifting apparatus 1 can realize power reversal without power interruption. The power reversing device 3 comprises a third shaft S3 and a fourth shaft S4, a first reversing clutch CR, a second reversing clutch CF and a plurality of third gears are arranged on the third shaft S3, the first reversing clutch CR or the second reversing clutch CF is connected with at least one of the plurality of third gears, a plurality of fourth gears are arranged on the fourth shaft S4, a part of the fourth gears are meshed with the second gears, the other part of the fourth gears are meshed with the third gears, and the third gears are meshed with the second gears. Because the plurality of first gears on the first shaft S1 and the plurality of second gears on the second shaft S2 are engaged to form a plurality of shift gear sets, that is, the plurality of shift gear sets at least include a first shift gear set and a second shift gear set, the first shift clutch is disposed corresponding to the first shift gear set, and the second shift clutch is disposed corresponding to the second shift gear set, in a first power gear state where the first shift clutch is connected to the first shift gear set, the second shift clutch can be connected to the second shift gear set to switch the first power gear to the second power gear, so as to achieve the purpose of shifting gears and ensure that power is not interrupted during shifting.

In the power reversing device 3, the third shaft S3 is provided with a first reversing clutch CR and a second reversing clutch CF, the first reversing clutch CR or the second reversing clutch CF is connected to one of the third gears, and when the first reversing clutch CR is combined with one of the third gears to place the power reversing device 3 in the first direction gear, the second reversing clutch CF can be connected to any one of the other third gears to switch the power reversing device 3 from the first direction gear to the second direction gear to reverse, so that the power is not interrupted during the reversing process. This power gearbox of shifting can realize under the condition of not cutting off power that power shifts and the function of power switching-over, can realize that the position switches over that keeps off more, simple structure, multiple functional, the efficient of shifting are favorable to improving the operating efficiency and shift the travelling comfort.

Optionally, the range shift device 2 includes a fifth shaft S5 and a sixth shaft S6, the fifth shaft S5 is provided with a fifth gear, the sixth shaft S6 is provided with a sixth gear engaged with the fifth gear, the fifth shaft S5 is in transmission connection with the third shaft S3 and is located on the same axis, and the sixth shaft S6 is configured to be connected with the rear axle 105.

Optionally, with reference to fig. 2, the axes of the first shaft S1, the second shaft S2, the third shaft S3, and the fourth shaft S4 are distributed in a quadrilateral space, and the device is reasonable in spatial layout, compact in structure, and small in occupied space. It is easy to understand that the spatial quadrilateral distribution means that the axes of the four shafts are not in the same plane, and the axes of any two shafts of the four shafts are not collinear. In the present embodiment, the first shaft S1, the second shaft S2, the third shaft S3, and the fourth shaft S4 are disposed parallel to each other, and the fifth shaft S5 is disposed parallel to the sixth shaft S6. Preferably, the second axis S2, the third axis S3 and the fourth axis S4 are spatially distributed in a "pin" shape. The distribution makes the structure compacter, the transmission efficiency is high, and is simple and convenient, effectively saves space, has reduced the volume of gearbox.

In this embodiment, the power shift device 1 is provided with a plurality of shift clutches, and the first shift clutch and the second shift clutch are any two of the plurality of shift clutches; the first shifting clutch is arranged on the first shaft S1 or the second shaft S2, and the second shifting clutch is arranged on the first shaft S1 or the second shaft S2. Optionally, the plurality of first gears includes a plurality of shift driving gears, the plurality of shift clutches includes a first clutch C2, a second clutch C4, a third clutch C1 and a fourth clutch C3, the first clutch C2 and the second clutch C4 are disposed on the first shaft S1, the third clutch C1 and the fourth clutch C3 are disposed on the second shaft S2, and the first clutch C2 or the second clutch C4 is connected with the shift driving gears; the plurality of second gears comprise a plurality of shifting driven gears and a forward driving gear Z13, and the third clutch C1 or the fourth clutch C3 is connected with the shifting driven gears; each gear shifting driving gear is meshed with one gear shifting driven gear to form one gear shifting gear set. The gear shifting driving gear comprises a first-gear driving gear Z1, a second-gear driving gear Z3, a third-gear driving gear Z5 and a fourth-gear driving gear Z7, wherein the first-gear driving gear Z1, the second-gear driving gear Z3, a first clutch C2, a third-gear driving gear Z5, a second clutch C4 and a fourth-gear driving gear Z7 are sequentially arranged on a first shaft S1, and the first-gear driving gear Z1 is close to the engine 101. The second gear drive gear Z3 is selectively connected to the first clutch C2, and the fourth gear drive gear Z7 is selectively connected to the second clutch C4. Alternatively, the second-gear drive gear Z3 is splined to a friction plate of the first clutch C2, and the fourth-gear drive gear Z7 is splined to a friction plate of the second clutch C4. The third speed drive gear Z5 is integrally provided with the first shaft S1, and the ring gear of the first clutch C2 and the ring gear of the second clutch C4 are integrally provided with the first shaft S1, respectively. The first gear driving gear Z1 is fixedly connected to the first shaft S1, for example, by a spline connection; the second gear driving gear Z3 and the fourth gear driving gear Z7 are respectively rotatably sleeved on the first shaft S1.

The shifting driven gears comprise a first-gear driven gear Z2, a second-gear driven gear Z4, a third-gear driven gear Z6 and a fourth-gear driven gear Z8, and the first-gear driven gear Z2, a third clutch C1, a second-gear driven gear Z4, a fourth clutch C3, a third-gear driven gear Z6, a fourth-gear driven gear Z8 and a forward gear driving gear Z13 are sequentially arranged on the second shaft S2. The first-gear driven gear Z2 is engaged with the first-gear driving gear Z1, the second-gear driven gear Z4 is engaged with the second-gear driving gear Z3, the third-gear driven gear Z6 is engaged with the third-gear driving gear Z5, and the fourth-gear driven gear Z8 is engaged with the fourth-gear driving gear Z7. Alternatively, the first-speed driven gear Z2 is selectively splined to a friction plate of the third clutch C1, and the third-speed driven gear Z6 is selectively splined to a friction plate of the fourth clutch C3. In the present embodiment, the second driven gear Z4 is provided integrally with the second shaft S2, and the ring gear of the third clutch C1 and the ring gear of the fourth clutch C3 are provided integrally with the second shaft S2, respectively. The fourth-gear driven gear Z8 and the forward driving gear Z13 are fixedly connected with the second shaft S2, for example, through spline connection; the first-gear driven gear Z2 and the third-gear driven gear Z6 are respectively rotatably sleeved on the second shaft S2.

It will be appreciated that the inclusion of 4 shifting clutches in powershift apparatus 1 allows 4 gears, namely first, second, third and fourth, to be achieved, each controlled by 1 clutch, and only one of the clutches to be engaged simultaneously. During the shifting process, in a state that one of the shifting clutches is combined with the corresponding shifting gear set, the shifting can be realized by combining the other shifting clutches with the corresponding shifting gear set, for example, in a second-gear state that the first clutch C2 is combined with the second-gear driving gear Z3, the fourth clutch C3 can be connected with the third-gear driven gear Z6 to shift the power gear from the second gear to the third gear. Therefore, power shifting can be achieved under the state that power is not cut off, the shifting efficiency is high, and the operation efficiency and the shifting comfort are improved.

The plurality of third gears comprise a reverse gear driven gear Z17 and a forward gear driven gear Z14, the reverse gear driven gear Z17, the first reversing clutch CR, the second reversing clutch CF and the forward gear driven gear Z14 are sequentially arranged on a third shaft S3 from front to back, the tail end of the third shaft S3 is in transmission connection with a fifth shaft S5, and optionally, the third shaft S3 is in spline connection with the fifth shaft S5. In this embodiment, the forward driven gear Z14 and the reverse driven gear Z17 are respectively rotatably sleeved on the third shaft S3, the forward driven gear Z14 is engaged with the forward driving gear Z13, the reverse driven gear Z17 is selectively connected to a friction plate of the first reversing clutch CR, and the forward driven gear Z14 is selectively connected to a friction plate of the second reversing clutch CF. The ring gear of the first changeover clutch CR and the ring gear of the second changeover clutch CF are disposed back to back and are respectively integrally provided with the third shaft S3.

The fourth plurality of gears comprises a reverse first-stage idler Z15 and a reverse second-stage idler Z16, optionally the reverse first-stage idler Z15 and the reverse second-stage idler Z16 are each rigidly connected, i.e. fixedly connected, to the fourth shaft S4. The reverse first-stage idler Z15 meshes with the second-stage driven gear Z4, and the reverse second-stage idler Z16 meshes with the reverse driven gear Z17. It will be understood that the power reverser 3 can realize two gears, i.e. a forward gear and a reverse gear, each controlled by 1 clutch and only one of which can be engaged simultaneously. The forward gear is controlled by the second reversing clutch CF and the reverse gear is controlled by the first reversing clutch CR. In the reversing process, when the first reversing clutch CR is combined with the reverse driven gear Z17 in the third gear to be in the reverse state, the reverse gear can be switched to the forward gear from the reverse gear through the combination of the second reversing clutch CF and the forward driven gear Z14, so that the reversing is realized, the power reversing can be realized in the state of not cutting off the power, the reversing efficiency is high, and the operation efficiency and the reversing comfort are favorably improved.

The range-shifting device 2 further comprises a seventh shaft S7 arranged in parallel with the sixth shaft S6, the seventh shaft S7 being adapted to be connected to the front axle 107, the fifth gear comprising a plurality of range-shifting driving gears, the sixth gear comprising a forward drive driving gear Z26, a first synchronizer U1, a second synchronizer U2 and a plurality of range-shifting driven gears, each range-shifting driving gear being in mesh with one range-shifting driven gear. Optionally, the range shift driving gear includes an L-gear driving gear Z18, an M1-gear driving gear Z20, an M2-gear driving gear Z22 and an H-gear driving gear Z24 which are sequentially disposed on the fifth shaft S5 from front to rear, wherein the L-gear driving gear Z18 is adjacent to the third shaft S3. The range shifting driven gear comprises an L-gear driven gear Z19, an M1-gear driven gear Z21, an M2-gear driven gear Z23 and an H-gear driven gear Z25, a sixth shaft S6 is provided with a front-drive driving gear Z26, the L-gear driven gear Z19, a first synchronizer U1, the M1-gear driven gear Z21, the M2-gear driven gear Z23, a second synchronizer U2 and the H-gear driven gear Z25 in sequence from front to back, the H-gear driven gear Z25 is arranged close to the rear axle 105, and the tail end of the sixth shaft S6 is connected with the rear axle 105; the L-gear driven gear Z19 is meshed with an L-gear driving gear Z18, the M1-gear driven gear Z21 is meshed with an M1-gear driving gear Z20, the M2-gear driven gear Z23 is meshed with an M2-gear driving gear Z22, and the H-gear driven gear Z25 is meshed with an H-gear driving gear Z24.

In this embodiment, the seventh shaft S7 is provided with a forward drive driven gear Z27, the forward drive driven gear Z27 is engaged with the forward drive driving gear Z26, and optionally, the forward drive driven gear Z27 and the seventh shaft S7 are integrally provided. The L-gear driving gear Z18 and the fifth shaft S5 are integrally arranged, the M1-gear driving gear Z20, the M2-gear driving gear Z22 and the H-gear driving gear Z24 are fixedly connected with the fifth shaft S5 respectively, and the front drive driving gear Z26, the first synchronizer U1 and the second synchronizer U2 are fixedly connected with the sixth shaft S6 respectively, namely rigidly connected. The L-gear driven gear Z19, the M1-gear driven gear Z21, the M2-gear driven gear Z23 and the H-gear driven gear Z25 are respectively rotatably sleeved on the sixth shaft S6.

It will be appreciated that the range shift device 2 can achieve four gears, with the first synchronizer U1 controlling the L gear and the M1 gear, and the second synchronizer U2 controlling the M2 gear and the H gear, with only one of the gears being engaged simultaneously.

Alternatively, the power output device 5 includes an output shaft 103, an eighth shaft S8, and a first driven gear Z10 provided on the eighth shaft S8, the output shaft 103 being connected to the eighth shaft S8 and being located on the same axis. Optionally, the eighth shaft S8 is integrally disposed with the first driven gear Z10, the first driven gear Z10 is rigidly connected to the output shaft 103 by a spline, the second gear set further includes a first driving gear Z9 disposed on the second shaft S2, optionally, the first driving gear Z9 is disposed on a side of the first driven gear Z2 away from the third clutch C1, and the first driving gear Z9 is engaged with the first driven gear Z10. In this embodiment, the first-gear driven gear Z2 and the first driving gear Z9 form a dual gear, and the dual gear is rotatably sleeved on the second shaft S2.

In this embodiment, the third shaft S3 and the fifth shaft S5 are hollow shafts, respectively, the output shaft 103 sequentially passes through the third shaft S3 and the fifth shaft S5, and the third shaft S3, the fifth shaft S5 and the output shaft 103 are coaxially arranged.

The pumping device 4 comprises a ninth shaft S9 and a tenth shaft S10 which are arranged in parallel, a first pumping gear Z11 is arranged on the ninth shaft S9, a second pumping gear Z12 is arranged on the tenth shaft S10, and the first pumping gear Z11 is meshed with the second pumping gear Z12 and the first driven gear Z10 respectively. Alternatively, the first pumping gear Z11 may be rotatably provided on the ninth shaft S9, and the second pumping gear Z12 may be integrally provided with the tenth shaft S10. It is understood that the ninth shaft S9 is disposed parallel to the second shaft S2.

It should be noted that, in the present embodiment, the first clutch C2, the second clutch C4, the third clutch C1, the fourth clutch C3, the first reversing clutch CR, and the second reversing clutch CF may adopt normally-disengaged electro-hydraulically-controlled wet multi-plate clutches, and each clutch may realize the engagement of the clutch according to a control command. For example, the first clutch C2 can be rigidly connected to the second driving gear Z3 according to the control command, while the first shaft S1, the second driving gear Z3 and the first clutch C2 do not rotate relatively.

The second clutch C4 is rigidly connected to the fourth gear drive gear Z7 according to the control command, and the first shaft S1, the fourth gear drive gear Z7 and the second clutch C4 do not rotate relative to each other.

The third clutch C1 can be rigidly connected to the driven gear Z2 according to the control command, and the second shaft S2, the driven gear Z2 and the third clutch C1 do not rotate relatively.

The fourth clutch C3 can be rigidly connected to the third driven gear Z6 according to the control command, while the second shaft S2, the third driven gear Z6 and the fourth clutch C3 do not rotate relatively.

The first reversing clutch CR is rigidly connected to the reverse driven gear Z17 in response to a control command, and the third shaft S3, the reverse driven gear Z17, and the first reversing clutch CR do not rotate relative to each other.

The second reversing clutch CF is rigidly connected to the forward driven gear Z14 according to a control command, and the third shaft S3, the forward driven gear Z14 and the second reversing clutch CF do not rotate relatively.

The power transmission mode of the power gear shifting gearbox provided by the embodiment of the invention is as follows:

in the power shift device 1, when shifting to 1 st gear: only the third clutch C1 on the second shaft S2 is engaged with the first-speed driven gear Z2, and power is output from the engine 101, sequentially passes through the first shaft S1, the first-speed driving gear Z1, the first-speed driven gear Z2, the third clutch C1, and the second shaft S2, and is transmitted to the second shaft S2.

If shift to 2 shifts: only the first clutch C2 of the first shaft S1 is engaged with the second gear drive gear Z3, and the power of the engine 101 is transmitted to the second shaft S2 along the first shaft S1, the first clutch C2, the second gear drive gear Z3, and the second gear driven gear Z4.

If shift to 3 shifts: only the fourth clutch C3 on the second shaft S2 is engaged with the third driven gear Z6, and power is output from the engine 101, sequentially passes through the first shaft S1, the third driving gear Z5, the third driven gear Z6, and the fourth clutch C3, and is transmitted to the second shaft S2.

If the gear is switched to the 4-gear: only the second clutch C4 of the first shaft S1 is engaged with the fourth-gear drive gear Z7, and power is output from the engine 101, sequentially passes through the first shaft S1, the second clutch C4, the fourth-gear drive gear Z7, and the fourth-gear driven gear Z8, and is transmitted to the second shaft S2.

The power steering device 3 includes switching between a forward gear F and a reverse gear R.

If shift to gear F: only the second changeover clutch CF on the third shaft S3 is engaged with the forward driven gear Z14, and power is output from the second shaft S2, passes through the forward driving gear Z13, the forward driven gear Z14, and the second changeover clutch CF in this order, and is transmitted to the third shaft S3.

If the gear is switched to the R gear: only the first reversing clutch CR on the third shaft S3 is engaged with the reverse driven gear Z17, and power is transmitted from the second shaft S2 to the third shaft S3 through the first driven gear Z2, the reverse first-stage idler gear Z15, the sixth shaft S6, the reverse second-stage idler gear Z16, the reverse driven gear Z17, and the first reversing clutch CR in this order.

The power on the third shaft S3 is transmitted to the fifth shaft S5 through a spline.

In the range shift device 2, the first synchronizer U1 and the second synchronizer U2 can form four power gears, namely, an L gear, an M1 gear, an M2 gear and an H gear, wherein the first synchronizer U1 controls the L gear and the M1 gear, and the second synchronizer U2 controls the M2 gear and the H gear.

When the gear is switched to the L gear, the first synchronizer U1 slides leftwards and is meshed with a spline of the L gear driven gear Z19, and power is transmitted to the sixth shaft S6 along the fifth shaft S5 sequentially through the L gear driving gear Z18, the L gear driven gear Z19 and the first synchronizer U1.

Shift to gear M1: the first synchronizer U1 slides rightwards and is meshed with the spline of the M1 gear driven gear Z21, and power is transmitted to the sixth shaft S6 along the fifth shaft S5 through the M1 gear driving gear Z20, the M1 gear driven gear Z21 and the first synchronizer U1 in sequence.

Shift to gear M2: the second synchronizer U2 slides leftwards and is meshed with the spline of the M2 gear driven gear Z23, and power passes through the M2 gear driving gear Z22, the M2 gear driven gear Z23 and the second synchronizer U2 in sequence along the fifth shaft S5 and is transmitted to the sixth shaft S6.

And C, switching to the H gear: the second synchronizer U2 slides to the right and is engaged with the spline of the H-speed driven gear Z25, and power is transmitted to the sixth shaft S6 along the fifth shaft S5, the H-speed driving gear Z24, the H-speed driven gear Z25 and the second synchronizer U2.

The power is transmitted to the sixth shaft S6, and finally reaches the rear axle 105.

As can be seen from the above, the powershift device 1 includes four gears, and the range shift device 2 includes four gears, so that 16 gears can be combined to form a forward gear, and theoretically, 16 gears can be combined to form a reverse gear. However, the reverse gear speed cannot be too high in consideration of safety factors, so that an electric control program can be adopted to shield partial gears. The shafting of the power gear shifting gearbox is distributed in a space quadrilateral mode, so that the power gear shifting gearbox is compact in structure, reasonable in layout and small in overall size, and the space occupied by the gearbox is reduced; and can realize that the position switches that keep off more, through the ingenious arrangement of a plurality of clutches and the switching-over clutch of shifting, compact structure can switch the fender position under the state that does not cut off power, realizes that power shifts and power switching-over, and fender position switches over efficiently, and the operation experience is more comfortable. The interval power shifting is realized through the first synchronizer U1 and the second synchronizer U2, the manufacturing cost is low, the shifting efficiency is high, and the power shifting gearbox is particularly suitable for high-power tractors or other high-power transmission systems, such as tractors and transmission systems with the pressure exceeding 300 HP.

The tractor provided by the embodiment of the invention comprises a tractor body and the power gear shifting gearbox as in any one of the previous embodiments, wherein the power gear shifting gearbox is arranged on the tractor body. Because this power gearbox of shifting can realize that many grades shift and switch, and it is efficient to shift grade, simple structure, it is multiple functional to compact structure, spatial layout is reasonable, reduces the shared volume of power gearbox of shifting, is favorable to laying of power gearbox peripheral part.

In summary, the power shifting gearbox and the tractor provided by the embodiment of the invention have the following beneficial effects:

the power shifting gearbox provided by the embodiment of the invention comprises a power shifting device 1, an interval shifting device 2 and a power reversing device 3, wherein the power shifting device 1 and the power reversing device 3 are in transmission connection through a gear pair, and the interval shifting device 2 and the power reversing device 3 are coaxially arranged and transmit power through splines. In the power shifting gearbox, the axes of a first shaft S1, a second shaft S2, a third shaft S3 and a fourth shaft S4 of a main shaft system are distributed in a space quadrilateral mode, and a fifth shaft S5 and a third shaft S3 are in transmission connection and are located on the same axis. This power gearbox of shifting's shafting adopts the space quadrangle to distribute, compact structure, and is rationally distributed, has reduced the volume of gearbox, effectively saves space, can realize that many gears switch simultaneously, and is multiple functional, switches to keep off the position and need not to cut off power, can realize power shift and power switching-over function, shifts efficiently, low in manufacturing cost, it is efficient to shift, and operation experience is more comfortable, is favorable to improving the travelling comfort of shifting.

The tractor provided by the embodiment of the invention comprises the power gear shifting gearbox, and the power gear shifting gearbox has the advantages of compact structure, reasonable spatial layout and small occupied space, is favorable for arrangement of peripheral pipeline parts of the gearbox on the tractor, can realize the functions of power gear shifting and power reversing, has high gear shifting efficiency, and is favorable for improving the operating efficiency and gear shifting comfort of the tractor.

The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A power shifting gearbox is characterized by comprising a power shifting device, a range shifting device and a power reversing device;

the power reversing device comprises a third shaft and a fourth shaft, wherein the third shaft is provided with a first reversing clutch, a second reversing clutch and a plurality of third gears, the fourth shaft is provided with a plurality of fourth gears, one part of the fourth gears are meshed with the second gears, the other part of the fourth gears are meshed with the third gears, and the third gears are meshed with the second gears; the first reversing clutch or the second reversing clutch is connected with one of the plurality of third gears; when the first reversing clutch is connected with one of the third gears so that the power reversing device is in a first direction gear, the second reversing clutch can be connected with any one of the rest third gears so that the power reversing device is switched from the first direction gear to a second direction gear;

2. The powershift transmission of claim 1, wherein a plurality of shifting clutches are provided in the powershift apparatus, and the first shifting clutch and the second shifting clutch are any two of the plurality of shifting clutches; the first gear shifting clutch is arranged on the first shaft or the second shaft, and the second gear shifting clutch is arranged on the first shaft or the second shaft.

3. The powershift transmission of claim 2, wherein said first plurality of gears comprises a plurality of shift drive gears, and said plurality of shift clutches comprises a first clutch, a second clutch, a third clutch, and a fourth clutch, said first clutch and said second clutch being disposed on said first shaft, said third clutch and said fourth clutch being disposed on said second shaft; the first clutch or the second clutch is connected with the gear shifting driving gear; the plurality of second gears comprise a plurality of shifting driven gears and forward gear driving gears, and the third clutch or the fourth clutch is connected with the shifting driven gears; each gear shifting driving gear is meshed with one gear shifting driven gear to form one gear shifting gear set.

4. The powershift transmission of claim 3, wherein the shift drive gear comprises a first gear drive gear, a second gear drive gear, a third gear drive gear, and a fourth gear drive gear, the first gear drive gear, the second gear drive gear, the first clutch, the third gear drive gear, the second clutch, and the fourth gear drive gear being disposed sequentially on the first shaft, wherein the first gear drive gear is proximate to the engine;

5. The powershift gearbox of claim 4, wherein the shift driven gears include a first-gear driven gear, a second-gear driven gear, a third-gear driven gear and a fourth-gear driven gear, and the first-gear driven gear, the third clutch, the second-gear driven gear, the fourth clutch, the third-gear driven gear, the fourth-gear driven gear and the forward driving gear are sequentially arranged on the second shaft;

6. The powershift gearbox of claim 5, wherein the plurality of third gears comprises a reverse driven gear and a forward driven gear, the reverse driven gear, the first reversing clutch, the second reversing clutch, and the forward driven gear being disposed on the third shaft in that order, the reverse driven gear being selectively connected to the first reversing clutch, the forward driven gear being selectively connected to the second reversing clutch;

7. The powershift gearbox of claim 6, wherein the ring gear of the first reversing clutch and the ring gear of the second reversing clutch are each integrally disposed with the third shaft; the forward gear driven gear and the reverse gear driven gear are respectively and rotatably sleeved on the third shaft.

8. A powershift gearbox according to any one of claims 1 to 7, wherein the range shift device comprises a fifth shaft on which is provided a fifth gear and a sixth shaft on which is provided a sixth gear in mesh with the fifth gear, the fifth shaft being in driving connection with the third shaft and being on the same axis, the sixth shaft being for connection with the rear axle.

9. The powershift transmission of claim 8, wherein the fifth gear comprises a plurality of range drive gears and the sixth gear comprises a forward drive gear, a first synchronizer, a second synchronizer, and a plurality of range driven gears, each of the range drive gears being in meshing engagement with one of the range driven gears.

10. The powershift transmission of claim 9, wherein the range shift further includes a seventh shaft disposed parallel to the sixth shaft, the seventh shaft configured to couple to a front axle, the seventh shaft having a forward-drive driven gear engaged with the forward-drive gear.

11. The powershift transmission of claim 9, wherein the range shift drive gear comprises an L-range drive gear, an M1-range drive gear, an M2-range drive gear, and an H-range drive gear arranged in sequence, the L-range drive gear being adjacent to the third shaft;

12. The powershift transmission of claim 11, wherein the L-range drive gear is integral with the fifth shaft, and wherein the M1-range drive gear, the M2-range drive gear and the H-range drive gear are each fixedly connected to the fifth shaft.

13. The powershift transmission of claim 11, wherein the forward drive gear, the first synchronizer, and the second synchronizer are each fixedly coupled to the sixth shaft; the L-gear driven gear, the M1-gear driven gear, the M2-gear driven gear and the H-gear driven gear are respectively sleeved on the sixth shaft in a rotatable manner.

14. The powershift gearbox of claim 1, wherein axes of the first, second, third and fourth shafts are spatially quadrilateral.

15. The powershift gearbox of claim 1, wherein said first shaft, said second shaft, said third shaft, and said fourth shaft are disposed parallel to one another.

16. The powershift gearbox of claim 1, wherein the second shaft, the third shaft, and the fourth shaft are spatially "chevrons".

17. A powershift gearbox according to any one of claims 9 to 13, further comprising a power take off comprising an output shaft, an eighth shaft and a first driven gear provided on the eighth shaft, the output shaft being connected to the eighth shaft and being on the same axis;

the second gear also comprises a first driving gear arranged on the second shaft, and the first driving gear is meshed with the first driven gear.

18. The powershift transmission of claim 17, wherein said third shaft and said fifth shaft are hollow shafts, respectively, and said output shaft passes through said third shaft and said fifth shaft in sequence, said third shaft, said fifth shaft and said output shaft being coaxially disposed.

19. The powershift gearbox of claim 17, further comprising a pumping device, wherein the pumping device comprises a ninth shaft and a tenth shaft arranged in parallel, the ninth shaft is provided with a first pumping gear, the tenth shaft is provided with a second pumping gear, and the first pumping gear is respectively engaged with the second pumping gear and the first driven gear.

20. A tractor comprising a body and a powershift gearbox according to any one of claims 1 to 19 provided on the body.