A transmission and tractor

Abstract

The utility model provides a transmission and tractor, include: with engine connection's main shaft, power output shaft, first intermediate shaft, second intermediate shaft, third intermediate shaft, reversing clutch, reverse drive shaft and reverse driven shaft. First intermediate shaft, second intermediate shaft, third intermediate shaft are empty and are covered in main shaft, reversing clutch includes the first clutch component for connecting or disconnecting power transmission between main shaft and first intermediate shaft, the second clutch component for disconnecting or connecting power transmission between main shaft and second intermediate shaft. When second clutch component disconnects, first clutch component connects, main shaft power transmission to first intermediate shaft, and first intermediate shaft is driven second intermediate shaft reverse rotation through reverse driven gear, reverse driving gear, reverse drive shaft, reverse driven shaft, and after the speed change of second intermediate gear group, third intermediate gear group, power output shaft will shift the power output after the speed change.

Description

Technical Field

[0001] This utility model relates to the field of gearbox technology, and in particular to a transmission device and a tractor. Background Technology

[0002] Currently, traditional tractors on the market require stopping, depressing the clutch, and engaging a gear when shifting gears or changing direction. This process not only causes the gearbox gears to idle, but also involves releasing the clutch after shifting gears, with the vehicle running at the speed after the gear change, making the operation cumbersome. Furthermore, when tractor-like agricultural machinery encounters significant resistance while climbing hills or tilling, or needs to shift gears when turning, power must be cut off, severely impacting work efficiency and quality. Therefore, it is necessary to provide a transmission device with power shifting and power reversing functions to overcome the aforementioned shortcomings. Utility Model Content

[0003] The purpose of this invention is to provide a transmission device for tractors with power shifting and power reversing functions, which can simultaneously meet the requirements of a large number of shifts, simple transmission circuit, high transmission efficiency, and low failure rate.

[0004] This utility model provides a transmission device for a tractor with power shifting and power reversing functions, comprising: a main shaft connected to an engine for outputting engine power; a first intermediate shaft loosely fitted on the main shaft; a second intermediate shaft loosely fitted on the main shaft; a third intermediate shaft loosely fitted on the main shaft, wherein the first, second, and third intermediate shafts move independently; a reverse drive gear disposed on the first intermediate shaft; a second intermediate gear set disposed on the second intermediate shaft; a third intermediate gear set disposed on the third intermediate shaft; a reversing clutch comprising a first clutch assembly disposed between the main shaft and the first intermediate shaft for connecting or disconnecting power transmission, and a second clutch assembly disposed between the main shaft and the second intermediate shaft for disconnecting or connecting power transmission; and a reverse drive shaft. The reverse drive shaft is equipped with a reverse driven gear, which is connected to the reverse drive gear for power transmission; a reverse driven shaft is located between the reverse drive shaft and a second intermediate shaft; a reverse driven gear set is located on the reverse driven shaft and connected to the second intermediate shaft for power transmission; a first gear set; a first drive shaft is connected to the second intermediate shaft via the first gear set for power transmission; a first driven shaft is coaxially arranged with the first drive shaft; a first clutch is located between the first drive shaft and the first driven shaft to connect or disconnect power transmission; a first driven gear set is located on the first driven shaft and connected to the third intermediate gear set for power transmission; and a power output shaft is driven by the third intermediate gear set to output the power after gear shifting.

[0005] Preferably, the transmission device further includes: a second gear set; a second drive shaft, the second drive shaft being connected to the second intermediate shaft via the second gear set for power transmission; a second driven shaft, the second driven shaft being coaxially arranged with the second drive shaft; a second clutch, the second clutch being disposed between the second drive shaft and the second driven shaft for connecting or disconnecting power transmission; and a second driven gear set, the second driven gear set being disposed on the second driven shaft and connected to the third intermediate gear set for power transmission.

[0006] Preferably, the transmission device further includes: a third gear set; a third drive shaft, the third drive shaft being connected to the second intermediate shaft via the third gear set for power transmission; a third driven shaft, the third driven shaft being coaxially arranged with the third drive shaft; a third clutch, the third clutch being disposed between the third drive shaft and the third driven shaft for connecting or disconnecting power transmission; and a third driven gear set, the third driven gear set being disposed on the third driven shaft and connected to the third intermediate gear set for power transmission.

[0007] Preferably, the first driven gear set, the second driven gear set, and the third driven gear set are gear sets with the same structure.

[0008] Preferably, the first drive shaft, the first driven shaft, the second drive shaft, the second driven shaft, the third drive shaft, the third driven shaft, the reverse drive shaft, and the reverse driven shaft are all arranged in parallel.

[0009] Preferably, the transmission device further includes: a creeper gear set; a creeper shaft, wherein the creeper shaft is connected to the power output shaft through the creeper gear set for power transmission, and the creeper shaft is arranged parallel to the power output shaft.

[0010] Preferably, the transmission device further includes: a four-wheel drive gear set; a four-wheel drive shaft, which is connected to the power output shaft through the four-wheel drive gear set to transmit power, thereby realizing four-wheel drive force output; a four-wheel drive driven shaft, which is coaxially arranged with the four-wheel drive shaft; and a four-wheel drive clutch, which is placed between the four-wheel drive shaft and the four-wheel drive driven shaft to connect or disconnect the four-wheel drive force transmission.

[0011] Preferably, the transmission device further includes a TCU and a hydraulic system, wherein the transmission device controls the hydraulic system to operate via the TCU to achieve the coordination between the synchronizer and the clutch, thereby realizing the gear shifting operation.

[0012] Preferably, the transmission device further includes: a PTO gear set; a PTO drive shaft, the PTO drive shaft being connected to the main shaft via the PTO gear set for power transmission; a PTO output shaft, the PTO output shaft being coaxially arranged with the PTO drive shaft; and a PTO clutch, the PTO clutch being positioned between the PTO drive shaft and the PTO output shaft for connecting or disconnecting power transmission.

[0013] This utility model also provides a tractor, which includes a transmission device with power shift and power reversing functions as described above.

[0014] The transmission device and tractor with power shifting and power reversing functions provided by this utility model can achieve at least one of the following beneficial effects: The transmission device and tractor with power shifting and power reversing functions provided by this utility model can not only realize the shifting operation under uninterrupted power, but also, through the offset design of the power output shaft and the power input shaft, can meet the requirements of a large number of shifts, simple transmission circuit, high transmission efficiency, and low failure rate. Attached Figure Description

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Figure 1 The transmission principle of the transmission device of this utility model is simplified. Figure 1 ; Figure 2 The transmission principle of the transmission device of this utility model is simplified. Figure 2 ; Figure 3 This is a left view of the transmission device of this utility model; Figure 4 for Figure 3 Sectional view of section AA; Figure 5 for Figure 3 Sectional view of section BB; Explanation of icon numbers: M, Engine; m, Main shaft; m1, First intermediate shaft; m2, Second intermediate shaft; m3, Third intermediate shaft; A1, First drive shaft; A2, Second drive shaft; A3, Third drive shaft; A4, Reverse drive shaft; a1, First driven shaft; a2, Second driven shaft; a3, Third driven shaft; a4, Reverse driven shaft; O, Power output shaft; W, Four-wheel drive shaft; w, Four-wheel drive driven shaft; P, Creeper shaft; A5, PTO drive shaft; a5, PTO output shaft; K1, First intermediate gear set; K2, Second intermediate gear set; K3, Third intermediate gear set; N1, First driven gear set; N2, Second driven gear set; N3, Third driven gear set; T, Power output gear set; H, Four-wheel drive gear set; U, Creeper gear set. Detailed Implementation

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] To keep the drawings concise, only the parts relevant to this invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of the components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0018] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0019] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0022] See Figures 1 to 5 The embodiment provides a transmission device for a tractor, including: a main shaft m, a first intermediate shaft m1, a second intermediate shaft m2, a third intermediate shaft m3, a first drive shaft A1, a second drive shaft A2, a third drive shaft A3, a reverse drive shaft A4, a first driven shaft a1, a second driven shaft a2, a third driven shaft a3, a reverse driven shaft a4, a power output shaft O, a four-wheel drive shaft W, a four-wheel driven shaft, and a crawler gear shaft P.

[0023] The main shaft m is connected to the engine M to output power from the engine M. The first intermediate shaft m1, the second intermediate shaft m2, and the third intermediate shaft m3 are all loosely fitted onto the main shaft m, and the first intermediate shaft m1, the second intermediate shaft m2, and the third intermediate shaft m3 move independently. The first intermediate shaft m1 is provided with a first intermediate gear set K1, which includes a reverse drive gear mounted on the first intermediate shaft. The reverse main gear is mounted on the first intermediate shaft m1. The second intermediate shaft m2 is provided with a second intermediate gear set K2, and the third intermediate shaft m3 is provided with a third intermediate gear set K3.

[0024] The transmission device further includes a reversing clutch F0, which includes a first clutch assembly placed between the main shaft m and the first intermediate shaft m1 for connecting or disconnecting power transmission, and a second clutch assembly placed between the main shaft m and the second intermediate shaft m2 for disconnecting or connecting power transmission.

[0025] The transmission device further includes: a first gear set; a first drive shaft A1, which is connected to the second intermediate shaft m2 via the first gear set for power transmission; a first driven shaft a1, which is coaxially arranged with the first drive shaft A1; a first clutch F1, which is placed between the first drive shaft A1 and the first driven shaft a1 to connect or disconnect the power transmission; a first driven gear set N1, which is disposed on the first driven shaft a1 and connected to the third intermediate gear set K3 for power transmission; and a power output shaft O, which is connected to the third intermediate gear set K3 for power transmission, to output the power after gear shifting.

[0026] When the first clutch assembly is disengaged and the second clutch assembly is engaged, the main shaft m transmits power to the second intermediate shaft m2. After the second intermediate shaft m2 passes through the first gear set, the first drive shaft A1, the first clutch F1, the first driven shaft a1, the first driven gear set N1, and the third intermediate gear set K3, the power output shaft O outputs the power after the gear shift.

[0027] The transmission device further includes: a second gear set; a second drive shaft A2, which is connected to the second intermediate shaft m2 via the second gear set for power transmission; a second driven shaft a2, which is coaxially arranged with the second drive shaft A2; a second clutch F2, which is placed between the second drive shaft A2 and the second driven shaft a2 for connecting or disconnecting power transmission; and a second driven gear set N2, which is disposed on the second driven shaft a2 and connected to the third intermediate gear set K3 for power transmission.

[0028] When the first clutch assembly is disengaged and the second clutch assembly is engaged, the main shaft m transmits power to the second intermediate shaft m2. After the second intermediate shaft m2 passes through the second gear set, the second drive shaft A2, the second clutch F2, the second driven shaft a2, the second driven gear set N2, and the third intermediate gear set K3, the power output shaft O outputs the power after the gear shift.

[0029] The transmission device further includes: a third gear set; a third drive shaft A3, which is connected to the second intermediate shaft m2 via the third gear set for power transmission; a third driven shaft a3, which is coaxially arranged with the third drive shaft A3; a third clutch F3, which is located between the third drive shaft A3 and the third driven shaft a3 for connecting or disconnecting power transmission; and a third driven gear set N3, which is located on the third driven shaft a3 and connected to the third intermediate gear set K3 for power transmission.

[0030] When the first clutch assembly is disengaged and the second clutch assembly is engaged, the main shaft m transmits power to the second intermediate shaft m2. After the second intermediate shaft m2 passes through the third gear set, the third drive shaft A3, the third clutch F3, the third driven shaft a3, the third driven gear set N3, and the third intermediate gear set K3, the power output shaft O outputs the power after the gear shift.

[0031] The transmission device also includes a reverse gear driven gear, which is mounted on the reverse drive shaft A4 and is connected to the reverse drive gear for power transmission; the reverse driven shaft a4 is located between the reverse drive shaft A4 and the second intermediate shaft m2; the reverse driven gear set is mounted on the reverse driven shaft a4 and is connected to the second intermediate shaft m2 for power transmission.

[0032] When the second clutch assembly is disengaged and the first clutch assembly is engaged, the main shaft m transmits power to the first intermediate shaft m1. The first intermediate shaft m1 drives the second intermediate shaft m2 to rotate in the opposite direction through the reverse driven gear, the reverse driving gear, the reverse drive shaft A4, and the reverse driven shaft a4. After the gears are changed by the second intermediate gear set K2, the third intermediate gear set K3, and other gear change components, the power output shaft O outputs the power after the gear change.

[0033] See appendix Figure 1 The first drive shaft A1, the first driven shaft a1, the second drive shaft A2, the second driven shaft a2, the third drive shaft A3, the third driven shaft a3, the reverse drive shaft A4, and the reverse driven shaft a4 are all arranged in parallel. The center lines connecting the axes of the first drive shaft A1, the second drive shaft A2, the third drive shaft A3, and the reverse drive shaft A4 form a trapezoid.

[0034] The transmission device further includes: a creeper gear set U; a creeper shaft P, wherein the creeper shaft P is connected to the power output shaft O through the creeper gear set U for power transmission, and the creeper shaft P is arranged parallel to the power output shaft O.

[0035] The transmission device further includes: a four-wheel drive gear set H; a four-wheel drive shaft W, which achieves four-wheel drive output through the four-wheel drive gear set H; a four-wheel drive driven shaft w, which is coaxially arranged with the four-wheel drive shaft W; and a four-wheel drive clutch F4, which is placed between the four-wheel drive shaft W and the four-wheel drive driven shaft w to connect or disconnect the four-wheel drive force transmission.

[0036] The transmission device further includes: a PTO gear set; a PTO drive shaft A5, which is connected to the main shaft m through the PTO gear set for power transmission; a PTO output shaft a5, which is coaxially arranged with the PTO drive shaft A5; and a PTO clutch F5, which is placed between the PTO drive shaft A5 and the PTO output shaft a5 to connect or disconnect the power transmission.

[0037] For those skilled in the art, the PTO gear set, PTO drive shaft A5, PTO output shaft a5, and PTO clutch F5 can be integrated into the transmission device or set independently in the PTO transmission box.

[0038] This does not preclude the possibility that the transmission device may include, for example, a pair of gears in a first gear set, which are connected by a flexible transmission member (e.g., a chain) and configured to produce the same transmission ratio as in the first gear set.

[0039] The transmission device also includes a TCU and a hydraulic system. The transmission device 100 controls the hydraulic system through the TCU to achieve the coordination between the synchronizer and the clutch, thereby realizing the gear shifting operation.

[0040] Synchronizers and clutches are devices known to those skilled in the art, and therefore will not be described further, nor are they described or shown in the specification. Figure 4 and Figure 5 The diagram does not show a specific illustration of the clutch. In practical applications, a clutch is installed between the drive shaft and the driven shaft.

[0041] Because TCUs and hydraulic systems are types known to those skilled in the art, they are neither described nor shown.

[0042] The shifting transmission route of the transmission device 100 in this embodiment is described in detail below. The first gear set includes a first gear 1 and a fourth gear 4 placed on the second intermediate shaft m2, a seventh gear 7 and a eighth gear 8 placed on the first drive shaft A1, and a first synchronizer S1 placed between the seventh gear 7 and the eighth gear 8; the first gear 1 and the seventh gear 7 are constantly meshed, and the fourth gear 4 and the eighth gear 8 are constantly meshed.

[0043] When the first synchronizer S1 is connected to the seventh gear 7, the first drive shaft A1 outputs a rotational speed to the first driven shaft a1 with the transmission ratio between the first gear 1 and the seventh gear 7; when the first synchronizer S1 is connected to the eighth gear 8, the first drive shaft A1 outputs a rotational speed to the first driven shaft a1 with the transmission ratio between the fourth gear 4 and the eighth gear 8.

[0044] The second gear set includes a second gear 2 and a fifth gear 5 placed on the second intermediate shaft m2, a ninth gear 9 and a tenth gear 10 placed on the second drive shaft A2, and a second synchronizer S2 placed between the ninth gear 9 and the tenth gear 10; the second gear 2 and the ninth gear 9 are constantly meshed, and the fifth gear 5 and the tenth gear 10 are constantly meshed.

[0045] When the second synchronizer S2 is connected to the ninth gear 9, the second drive shaft A2 outputs a rotational speed to the second driven shaft a2 with the transmission ratio between the second gear 2 and the ninth gear 9; when the second synchronizer S2 is connected to the tenth gear 10, the second drive shaft A2 outputs a rotational speed to the second driven shaft a2 with the transmission ratio between the fifth gear 5 and the tenth gear 10.

[0046] The third gear set includes gear 3 and gear 6 on the second intermediate shaft m2, gear 11 and gear 12 on the third drive shaft A3, and a third synchronizer S3 between gear 11 and gear 12; gear 3 and gear 11 are constantly meshed, and gear 6 and gear 12 are constantly meshed.

[0047] When the third synchronizer S3 is engaged with the eleventh gear 11, the third drive shaft A3 outputs a rotational speed to the third driven shaft a3 with the transmission ratio between the third gear 3 and the eleventh gear 11; when the third synchronizer S3 is engaged with the twelfth gear 12, the third drive shaft A3 outputs a rotational speed to the third driven shaft a3 with the transmission ratio between the sixth gear 6 and the twelfth gear 12.

[0048] The reverse gear drive gear is gear 14 located on the first intermediate shaft m1, the reverse gear driven gear is gear 15 located on the reverse gear drive shaft A4 and meshing with gear 14, gear 16 is also provided on the reverse gear drive shaft A4, and gear 13 is also provided on the reverse gear driven shaft between gear 6 and gear 16.

[0049] When the second clutch assembly is disengaged and the first clutch assembly is engaged, the power of the main shaft m is transmitted to the first intermediate shaft m1. The first intermediate shaft m1 outputs speed to the reverse drive shaft A4 through the transmission ratio between gear 14 and gear 15. The reverse drive shaft A4 outputs speed to the second intermediate shaft m2 through the transmission ratio between gear 16, gear 13 and gear 6. The second intermediate shaft m2 rotates in the opposite direction and changes speed through the second intermediate gear set K2, the third intermediate gear set K3 and other gear change components. Then, the power output shaft O outputs the power after the gear change.

[0050] The power output gear set T includes gear 30 and gear 32 loosely fitted on the power output shaft O, and eleventh synchronizer S11 and twelfth synchronizer S12 respectively placed on both sides of gear 30 and gear 32.

[0051] When the eleventh synchronizer S11 is connected to the thirtieth gear 30, the twelfth synchronizer S12 is separated from the thirty-second gear 32, and the power output shaft O outputs its rotational speed through the thirtieth gear 30; when the twelfth synchronizer S12 is connected to the thirty-second gear 32, the eleventh synchronizer S11 is separated from the thirtieth gear 30, and the power output shaft O outputs its rotational speed through the thirty-second gear 32.

[0052] The third intermediate gear set K3 includes gear 17 and gear 19 fixedly connected to the third intermediate shaft m3, gear 18 positioned between gear 17 and gear 19 and loosely fitted on the third intermediate shaft m3, and a fifth synchronizer S5 positioned between gear 18 and gear 19. Gear 18 is constantly meshed with gear 30, and gear 19 is constantly meshed with gear 32.

[0053] When the fifth synchronizer S5 is engaged with the eighteenth gear 18, the eleventh synchronizer S11 is engaged with the thirtieth gear 30, and the power output shaft O outputs speed through the transmission ratio between the eighteenth gear 18 and the thirtieth gear 30; when the fifth synchronizer S5 is disengaged from the eighteenth gear 18, the twelfth synchronizer S12 is engaged with the thirty-second gear 32, and the power output shaft O outputs speed through the transmission ratio between the nineteenth gear 19 and the thirty-second gear 32.

[0054] The first driven gear set N1 includes a gear 20 and a gear 21 loosely fitted on the first driven shaft a1, and a sixth synchronizer S6 placed between the gear 20 and the gear 21. The gear 20 is constantly meshed with the gear 17, and the gear 21 is constantly meshed with the gear 18.

[0055] When the sixth synchronizer S6 is connected to the 20th gear 20, the third intermediate shaft m3 outputs the rotational speed through the transmission ratio between the 17th gear 17 and the 20th gear 20; when the sixth synchronizer S6 is connected to the 21st gear 21, the third intermediate shaft m3 outputs the rotational speed through the transmission ratio between the 18th gear 18 and the 21st gear 21.

[0056] The second driven gear set N2 includes gear 22 and gear 23 loosely fitted on the second driven shaft a2, and a seventh synchronizer S7 placed between gear 22 and gear 23. Gear 22 is constantly meshed with gear 17, and gear 23 is constantly meshed with gear 18.

[0057] When the seventh synchronizer S7 is connected to the twenty-second gear 22, the third intermediate shaft m3 outputs the rotational speed through the transmission ratio between the seventeenth gear 17 and the twenty-second gear 22; when the seventh synchronizer S7 is connected to the twenty-third gear 23, the third intermediate shaft m3 outputs the rotational speed through the transmission ratio between the eighteenth gear 18 and the twenty-third gear 23.

[0058] The third driven gear set N3 includes gear 24 and gear 25 loosely fitted on the third driven shaft a3, and an eighth synchronizer S8 placed between gear 24 and gear 25. Gear 24 is constantly meshed with gear 17, and gear 25 is constantly meshed with gear 18.

[0059] When the eighth synchronizer S8 is connected to the twenty-fourth gear 24, the third intermediate shaft m3 outputs the rotational speed through the transmission ratio between the seventeenth gear 17 and the twenty-fourth gear 24; when the eighth synchronizer S8 is connected to the twenty-fifth gear 25, the third intermediate shaft m3 outputs the rotational speed through the transmission ratio between the eighteenth gear 18 and the twenty-fifth gear 25.

[0060] The creeper gear set U includes a gear 31 (positioned on the power output shaft O and fixedly connected to the gear 32), a gear 28 (loosely fitted on the power output shaft O), a 10th synchronizer S10 (positioned on the power output shaft O), a gear 33 (positioned on and fixedly connected to the creeper shaft P), and a gear 35 (positioned on and fixedly connected to the creeper shaft P). Gear 31 and gear 35 are constantly meshed, and gear 28 and gear 33 are constantly meshed.

[0061] When the creeper gear set U is working, the twelfth synchronizer S12 is separated from the thirty-second gear 32. When the tenth synchronizer S10 is connected to the twenty-eighth gear 28, the creeper shaft P outputs speed through the transmission ratio between the thirty-first gear 31 and the thirty-fifth gear 35. Then, the power output shaft O outputs speed through the transmission ratio between the thirty-third gear 33 and the twenty-eighth gear 28.

[0062] The four-wheel drive gear set H includes a No. 29 gear 29 which is placed on and fixedly connected to the power output shaft O, a No. 36 gear 36 which is fixedly connected to the four-wheel drive shaft W, and a No. 34 gear 34 which is placed between the No. 29 gear 29 and the No. 36 gear 36 and loosely fitted on the crawling gear shaft P.

[0063] The twenty-ninth gear 29 is constantly meshed with the thirty-fourth gear 34, and the thirty-fourth gear 34 is constantly meshed with the thirty-sixth gear 36. The four-wheel drive shaft W outputs its speed through the transmission ratio between the twenty-ninth gear 29, the thirty-fourth gear 34, and the thirty-sixth gear 36.

[0064] When the four-wheel drive clutch F4 is engaged, the four-wheel drive shaft W transmits the rotational speed to the four-wheel drive driven shaft w, and the four-wheel drive driven shaft w then outputs four-wheel drive.

[0065] The PTO gear set includes a No. 26 gear 26 mounted on the main shaft m and a No. 27 gear 27 mounted on the PTO drive shaft. The main shaft m outputs a rotational speed to the PTO drive shaft A5 through the transmission ratio between the No. 26 gear 26 and the No. 27 gear 27. When the PTO clutch F5 is engaged, the PTO drive shaft transmits the rotational speed to the PTO output shaft a5, and the PTO output shaft a5 then outputs power.

[0066] In this embodiment, the term "empty sleeve" refers to a gear fitted onto a shaft to achieve relative rotation on the shaft. The empty sleeve can be a bearing, bushing, or other component added between the gear and the shaft, or the gear can be directly mounted on the shaft. Bearings and bushings are devices known to those skilled in the art, and therefore will not be described further, nor are they described or shown in the specification.

[0067] It will be apparent to those skilled in the art that various modifications and variations can be made to the exemplary embodiments of the present invention without departing from the spirit and scope of the present invention. Therefore, it is intended that the present invention cover modifications and variations falling within the scope of the appended claims and their equivalents.

Claims

1. A transmission device, characterized in that, include: The main shaft is connected to the engine to output engine power; A first intermediate shaft is loosely fitted onto the main shaft; The second intermediate shaft is loosely fitted onto the main shaft; The third intermediate shaft is loosely fitted on the main shaft, and the first, second and third intermediate shafts move independently of each other; The first intermediate gear set includes a reverse drive gear disposed on the first intermediate shaft; The second intermediate gear set is disposed on the second intermediate shaft; The third intermediate gear set is disposed on the third intermediate shaft; A reversing clutch, the reversing clutch including a first clutch assembly disposed between the main shaft and the first intermediate shaft for connecting or disconnecting power transmission, and a second clutch assembly disposed between the main shaft and the second intermediate shaft for disconnecting or connecting power transmission; A reverse drive shaft is provided with a reverse driven gear, which is connected to the reverse drive gear for power transmission. A reverse gear driven shaft, wherein the reverse gear driven shaft is located between the reverse gear drive shaft and the second intermediate shaft; A reverse driven gear set, wherein the reverse driven gear set is disposed on the reverse driven shaft and connected to the second intermediate shaft for power transmission; First gear set; A first drive shaft, which is connected to a second intermediate shaft via a first gear set for power transmission; A first driven shaft is coaxially arranged with the first drive shaft; A first clutch is located between the first drive shaft and the first driven shaft to connect or disconnect power transmission; The first driven gear set is disposed on the first driven shaft and connected to the third intermediate gear set for power transmission; A power output shaft is connected to the third intermediate gear set for transmission, and outputs the power after gear shifting; Second gear set; The second drive shaft is connected to the second intermediate shaft via the second gear set for power transmission. The second driven shaft is coaxially arranged with the second drive shaft; The second clutch is located between the second drive shaft and the second driven shaft to connect or disconnect the power transmission; The second driven gear set is located on the second driven shaft and is connected to the third intermediate gear set for power transmission.

2. The transmission device as described in claim 1, characterized in that, The transmission device also includes: Third gear set; The third drive shaft is connected to the second intermediate shaft via the third gear set for power transmission; The third driven shaft is coaxially arranged with the third drive shaft; The third clutch is located between the third drive shaft and the third driven shaft to connect or disconnect the power transmission; The third driven gear set is mounted on the third driven shaft and connected to the third intermediate gear set for power transmission.

3. The transmission device as described in claim 2, characterized in that, The first driven gear set, the second driven gear set, and the third driven gear set are gear sets with the same structure.

4. The transmission device as described in claim 2, characterized in that, The first drive shaft, the first driven shaft, the second drive shaft, the second driven shaft, the third drive shaft, the third driven shaft, the reverse drive shaft, and the reverse driven shaft are all arranged in parallel.

5. The transmission device as described in claim 1, characterized in that, The transmission device also includes: Creep gear set; A crawling gear shaft is provided, which is connected to the power output shaft via the crawling gear set for power transmission. The crawling gear shaft is arranged parallel to the power output shaft.

6. The transmission device as described in claim 1, characterized in that, The transmission device also includes: Four-wheel drive gear set; The four-wheel drive shaft is connected to the power output shaft through the four-wheel drive gear set to transmit power, thereby realizing four-wheel drive force output; The four-wheel drive driven shaft is coaxially arranged with the four-wheel drive shaft; A four-wheel drive clutch is positioned between the four-wheel drive shaft and the four-wheel drive driven shaft to connect or disconnect the transmission of four-wheel drive force.

7. The transmission device as described in claim 1, characterized in that, The transmission device also includes: The transmission device uses a TCU to control the hydraulic system to achieve the coordination between the synchronizer and the clutch, thereby enabling gear shifting.

8. The transmission device as described in claim 1, characterized in that, The reverse gear drive gear is gear number fourteen located on the first intermediate shaft, the reverse gear driven gear is gear number fifteen located on the reverse gear drive shaft and meshing with gear number fourteen, gear number sixteen is also provided on the reverse gear drive shaft, and gear number thirteen is also provided on the reverse gear driven shaft, located between one of the second intermediate gear sets and gear number sixteen.

9. The transmission device as described in claim 1, characterized in that, The transmission device also includes: PTO gear set; PTO drive shaft, wherein the PTO drive shaft is connected to the main shaft via the PTO gear set for power transmission; PTO output shaft, wherein the PTO output shaft is coaxially arranged with the PTO drive shaft; A PTO clutch is positioned between the PTO drive shaft and the PTO output shaft to connect or disconnect power transmission.

10. A tractor, characterized in that, Includes the transmission device as described in any one of claims 1 to 9.

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