A power shift transmission

Abstract

The application provides a power shift transmission, comprising a power shift unit and a synchronizer transmission unit, power is output through an input shaft, a hollow shaft, a fourth shaft, a sixth shaft and an eighth shaft by cooperation of each gear unit and clutch unit, power interruption during gear shifting is avoided, the operation experience of a driver is optimized, and the transmission is simple in structure, compact in structure and small in space occupation. Further, a creep gear unit is arranged between the power shift unit and the synchronizer transmission unit, power shift, power shift and creep gear functions can be realized, the power shift unit can realize six forward gears and three reverse gears, the creep gear unit can realize two gears of direct gear and creep gear, the synchronizer transmission unit can realize five gears, and the power shift transmission can provide 60 forward gears and 30 reverse gears.

Description

Technical Field

[0001] The invention belongs to the technical field of transmissions and relates to a power shift transmission. Background Art

[0002] At present, agricultural machinery equipment on the market mainly adopts mechanical shifting, which realizes power disconnection through clutch shifting or synchronizer shifting, and then selects the gear. The clutch shifting and synchronizer shifting operations are complicated, the driving experience is poor, and there is power interruption, which not only affects the efficiency of field operations, but also makes the operation very difficult, and the operation requirements for the driver are very high. Summary of the Invention

[0003] The purpose of the present invention is to solve the problems in the prior art of complex transmission shifting operation and power interruption, and to provide a power shift transmission.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A power shift transmission comprises a power shift unit and a synchronizer transmission unit, wherein one end of the power shift unit is connected to a power input device and the other end is connected to the synchronizer transmission unit;

[0006] The power shift unit includes an input shaft, a hollow shaft, a third shaft, and a fourth shaft arranged in parallel with each other; the input shaft transmits power to the hollow shaft through the first clutch unit, or the input shaft transmits power to the hollow shaft through the first gear unit, the third shaft, and the second clutch unit; the hollow shaft transmits power to the fourth shaft through the second gear unit and the third clutch unit, or the hollow shaft transmits power to the fourth shaft through the third gear unit and the fourth clutch unit;

[0007] The synchronizer transmission unit includes a sixth shaft and an eighth shaft arranged in parallel with each other, and the sixth shaft is sleeved on the fourth shaft; the sixth shaft transmits power to the eighth shaft through a first- and second-speed shifting mechanism in combination with the fourth gear unit or the fifth gear unit, or the sixth shaft transmits power to the eighth shaft through a third- and fourth-speed shifting mechanism in combination with the sixth gear unit or the seventh gear unit, or the sixth shaft transmits power to the eighth shaft through a fifth-speed shifting mechanism in combination with the eighth gear unit.

[0008] A further improvement of the present invention is:

[0009] The first gear unit includes a first gear set, a second gear set and a third gear set. The first gear set includes an input shaft gear and a third shaft input gear that are meshed with each other. The second gear set includes a mid-range driving gear and a forward gear idler gear that are meshed with each other. The third gear set includes a low-range driving gear, a reverse gear idler gear and a reverse gear idler gear. The low-range driving gear is meshed with the reverse gear idler gear through the reverse gear idler gear. The second gear unit includes a fourth gear set and a fifth gear set. The fourth gear set includes a mid-range driving gear and a mid-range driven gear that are meshed with each other. The fifth gear set includes a low-gear driven gear and a low-gear driving gear that are meshed with each other; the third gear unit includes a high-gear driving gear and a high-gear driven gear that are meshed with each other; the fourth gear unit includes a first-gear driving gear and a first-gear driven gear that are meshed with each other; the fifth gear unit includes a second-gear driving gear and a second-gear driven gear that are meshed with each other; the sixth gear unit includes a third-gear driving gear and a third-gear driven gear that are meshed with each other; the seventh gear unit includes a fourth-gear driving gear and a fourth-gear driven gear that are meshed with each other; and the eighth gear unit includes a fifth-gear driving gear and a fifth-gear driven gear that are meshed with each other.

[0010] The first clutch unit is a first wet clutch, the outer hub of the first wet clutch is connected to the input shaft, and the inner hub is connected to the hollow shaft; the second clutch unit is a second wet clutch and a third wet clutch sharing a common outer hub, the outer hubs of the second wet clutch and the third wet clutch are connected to the third shaft; the third clutch unit is a fourth wet clutch and a fifth wet clutch sharing a common outer hub, the outer hubs of the fourth wet clutch and the fifth wet clutch are connected to the fourth shaft; the fourth wet clutch unit is a sixth wet clutch, the outer hub of the sixth wet clutch is connected to the fourth shaft.

[0011] The input shaft is connected to the ninth shaft through the first connecting sleeve, and the power input device drives the PTO through the input shaft, the first connecting sleeve and the ninth shaft.

[0012] One end of the eighth shaft is connected to the rear axle, and the eighth shaft transmits power to the rear axle.

[0013] The eighth shaft is connected to the front-wheel drive input shaft and the front-wheel drive output shaft in sequence through the ninth gear unit. The front-wheel drive input shaft is provided with a seventh wet clutch to transmit power from the eighth shaft to the front axle.

[0014] The ninth gear unit includes a front drive driving wheel and a front drive driven wheel that are meshed with each other. The front drive driving wheel is connected to the eighth shaft, and the front drive driven wheel is connected to the front drive input shaft.

[0015] A climbing gear unit is connected between the power shift unit and the synchronizer transmission unit, and the climbing gear unit includes a sixth shaft and a seventh shaft of the climbing gear unit arranged in parallel with each other, one end of the sixth shaft of the climbing gear unit is connected to the fourth shaft through a second connecting sleeve, and the other end is connected to the sixth shaft, and a climbing gear shift mechanism is provided on the sixth shaft of the climbing gear unit, and the fourth shaft transmits power to the sixth shaft of the climbing gear unit through the second connecting sleeve, the first driving wheel of the climbing gear, and the first passive wheel of the climbing gear, the seventh shaft, the second driving wheel of the climbing gear, and the second passive wheel of the climbing gear in combination with the climbing gear shift mechanism.

[0016] The other ends of the seventh shaft and the eighth shaft are rotatably connected.

[0017] The power input device is an engine.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] By providing a power shift transmission, including a power shift unit and a synchronizer transmission unit, through the cooperation of various gear units and clutch units, the power input device outputs power through the input shaft, hollow shaft, fourth shaft, sixth shaft and eighth shaft, thereby achieving uninterrupted power during the shifting process, optimizing the driver's operating experience, and the transmission structure is simple and compact and occupies little space.

[0020] Furthermore, a crawling gear unit is arranged between the power shift unit and the synchronizer transmission unit, which can realize power shifting, power reversing and crawling gear functions. The power shift unit can realize six forward gears and three reverse gears, the crawling gear unit can realize two gears of direct gear and crawling gear, the synchronizer transmission unit can realize five gears, and the power shift transmission can provide 60 forward gears and 30 reverse gears. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 It is a schematic diagram of the principle of the present invention.

[0023] Among them: 1- first gear, 2- second gear, 3- third gear, 4- fourth gear, 5- fifth gear, 10A- power shift unit; 20A- climbing gear unit; 30A- synchronizer transmission unit; S1- input shaft; S2- hollow shaft; S3- third shaft; S4- fourth shaft; S5- idler shaft; S61- climbing gear unit sixth shaft; S62- sixth shaft; S7- seventh shaft; S8- eighth shaft; S9- ninth shaft; 110- first wet clutch; 120- second wet clutch; 130- third wet clutch; 140- fourth wet clutch; 150- fifth wet clutch; 160- sixth wet clutch; 40- seventh wet clutch; 10- low gear driven gear; 11- input shaft gear; 12- third shaft input gear; 13- high gear driving gear; 14- middle gear driving gear; 15- low gear driving gear; 16- forward gear Idler gear; 17-reverse gear idler gear; 18-reverse gear idler gear; 19-high gear driven gear; 20-mid gear driven gear; 21-climbing gear first driving gear; 22-climbing gear first driven gear; 23-climbing gear second driving gear; 24-climbing gear second driven gear; 25-climbing gear shift mechanism; 26-second connecting sleeve; 30-fifth gear driven gear; 31-first gear driving gear; 32-second gear driving gear; 33-third gear driving gear; 34-fourth gear driving gear ;35-fifth gear driving wheel;36-first gear driven wheel;37-second gear driven wheel;38-third gear driven wheel;39-fourth gear driven wheel;41-front drive driving wheel;42-front drive driven wheel;43-front drive input shaft;44-front drive output shaft;111-first connecting sleeve;310-first and second gear shifting mechanism;320-third and fourth gear shifting mechanism;330-fifth gear shifting mechanism;A-power input device;B-rear axle;C-front axle. DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0027] In the description of the embodiments of the present invention, it should be noted that if the terms "upper," "lower," "horizontal," "inner," etc. appear, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the inventive product is typically placed when in use. These terms are merely for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first," "second," etc. are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0028] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0029] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. 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 internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0030] The present invention is described in further detail below with reference to the accompanying drawings:

[0031] See also Figure 1, is a schematic diagram of the principle of a power shift transmission of the present invention, including a power shift unit 10A and a synchronizer transmission unit 30A. One end of the power shift unit 10A is connected to the power input device A, and the other end is connected to the synchronizer transmission unit 30A. The power shift unit 10A includes an input shaft S1, a hollow shaft S2, a third shaft S3, a fourth shaft S4 and an idler shaft S5 arranged in parallel with each other. The hollow shaft S2 is sleeved on the input shaft S1. The input shaft S1 is connected to the outer hub of the first wet clutch 110. The hollow shaft S2 is connected to the inner hub of the first wet clutch 110. The third shaft S3 is connected to the outer hubs of the second wet clutch 120 and the third wet clutch 130. The fourth shaft S4 is connected to the outer hubs of the fourth wet clutch 140, the fifth wet clutch 150 and the sixth wet clutch 160. The input shaft gear 11 is rigidly connected to the third shaft input gear 12, and the input shaft gear 11 is meshed with the third shaft input gear 12. The high-speed driving gear 13, the middle-speed driving gear 14 and the low-speed driving gear 15 are rigidly connected to the hollow shaft S2. The forward idler gear 16 is connected to the inner hub of the second wet clutch 120, the reverse idler gear 17 is connected to the inner hub of the third wet clutch 130, the high-speed driven gear 19 is connected to the inner hub of the sixth wet clutch 160, and the low-speed driven gear 10 is connected to the inner hub of the fourth wet clutch 140. The high-speed driving gear 13 is meshed with the high-speed driven gear 19, the middle-speed driving gear 14 is meshed with the forward idler gear 16 and the middle-speed driven gear 20 respectively, the low-speed driving gear 15 is meshed with the low-speed driven gear 10, and the low-speed driving gear 15 is meshed with the reverse idler gear 17 through the reverse idler gear 18.

[0032] The power transmission from the input shaft S1 to the hollow shaft S2 is:

[0033] (1) The input shaft S1 transmits power to the hollow shaft S2 through the first wet clutch 110;

[0034] (2) The input shaft S1 transmits power to the third shaft S3 through the input shaft gear 11 and the third shaft input gear 12. The third shaft S3 transmits power to the hollow shaft S2 through the second wet clutch 120, the forward gear idler gear 16 and the intermediate gear driving gear 14.

[0035] At this time, there is a ratio relationship between the rotation speed of the hollow shaft S2 and the rotation speed of the input shaft S1. The required proportional relationship can be obtained by adjusting the number of teeth of the four gears: the input shaft gear 11, the third shaft input gear 12, the forward gear idler gear 16 and the intermediate gear driving gear 14.

[0036] (3) The input shaft S1 transmits power to the third shaft S3 through the input shaft gear 11 and the third shaft input gear 12. The third shaft S3 transmits power to the hollow shaft S2 through the third wet clutch 130, the reverse idler gear 17, the reverse idler gear 18 and the low gear driving gear 15.

[0037] At this time, the rotation direction of the hollow shaft S2 is opposite to that of the input shaft S1, and there is a ratio relationship between the rotation speeds. The required proportional relationship can be obtained by adjusting the number of teeth of the reverse gear idler gear 17 and the low gear driving gear 15.

[0038] The power transmission from the hollow shaft S2 to the fourth shaft S4 is:

[0039] (1) The hollow shaft S2 transmits power to the fourth shaft S4 through the high-speed driving wheel 13, the high-speed driven wheel 19, and the sixth wet clutch 160;

[0040] (2) The hollow shaft S2 transmits power to the fourth shaft S4 through the middle gear driving wheel 14, the middle gear driven wheel 20 and the fifth wet clutch 150;

[0041] (3) The hollow shaft S2 transmits power to the fourth shaft through the low-gear driving wheel 15 , the low-gear driven wheel 10 and the fourth wet clutch 140 .

[0042] The input shaft S1 is connected to the ninth shaft S9 through the first connecting sleeve 111 , and the power input device A drives the PTO through the input shaft S1 , the first connecting sleeve 111 and the ninth shaft S9 .

[0043] Table 1. Power shift unit gear logic

[0044]

[0045] Table 2. Power shift unit gear logic 2

[0046]

[0047] The synchronizer transmission unit 30A includes a sixth shaft S62 and an eighth shaft S8 arranged parallel to each other. The sixth shaft S62 is connected to a first-gear driving gear 31, a second-gear driving gear 32, a third- and fourth-gear shifting mechanism 320, and a fifth-gear shifting mechanism 330. The third-gear driving gear 33, the fourth-gear driving gear 34, and the fifth-gear driving gear 35 are loosely mounted on the sixth shaft S62. The eighth shaft S8 is connected to a fifth-gear driven gear 30, a third-gear driven gear 38, a fourth-gear driven gear 39, a front-drive driving gear 41, and a first- and second-gear shifting mechanism 310. The first-gear driven gear 36 and the second-gear driven gear 37 are loosely mounted on the eighth shaft S8. The first-gear driving gear 31 is meshed with the first-gear driven gear 36, the second-gear driving gear 32 is meshed with the second-gear driven gear 37, the third-gear driving gear 33 is meshed with the third-gear driven gear 38, the fourth-gear driving gear 34 is meshed with the fourth-gear driven gear 39, and the fifth-gear driving gear 35 is meshed with the fifth-gear driven gear 30.

[0048] The power transmission from the sixth shaft S62 to the eighth shaft S8 is:

[0049] (1) When the first gear is engaged, the first-second gear shift mechanism 310 moves to the right, and the power is transmitted from the sixth shaft S62 to the eighth shaft S8 through the first-gear driving wheel 31, the first-gear driven wheel 36, and the first-second gear shift mechanism 310;

[0050] (2) When the second gear is engaged, the first-second gear shift mechanism 310 moves to the left, and the power is transmitted from the sixth shaft S62 to the eighth shaft S8 through the second gear driving wheel 32, the second gear driven wheel 37 and the first-second gear shift mechanism 310;

[0051] (3) When the third gear is engaged, the second-third gear shift mechanism 320 moves to the right, and the power is transmitted from the sixth shaft S62 to the eighth shaft S8 through the third gear driving wheel 33, the third gear driven wheel 38 and the third-fourth gear shift mechanism 320;

[0052] (4) When the fourth gear is engaged, the second-third gear shift mechanism 320 moves to the left, and the power is transmitted from the sixth shaft S62 to the eighth shaft S8 through the fourth gear driving wheel 34, the fourth gear driven wheel 39 and the third-fourth gear shift mechanism 320;

[0053] (5) When the fifth gear is engaged, the fifth gear shift mechanism 330 moves to the right, and the power is transmitted from the sixth shaft S62 to the eighth shaft S8 through the fifth gear driving wheel 35, the fifth gear driven wheel 30 and the fifth gear shift mechanism 330.

[0054] The eighth shaft S8 is directly connected to the rear axle B, transmitting power to the rear axle B. The eighth shaft S8 is sequentially connected to the front drive input shaft 43 and the front drive output shaft 44 via the front drive wheels 41 and the front driven wheels 42. The front drive wheels 41 and the front driven wheels 42 are meshed, and the front drive input shaft 43 is provided with a seventh wet clutch 40. The eighth shaft transmits power to the front axle C via the front drive wheels 41, the front driven wheels 42, the front drive input shaft 43, the seventh wet clutch 40, and the front drive output shaft 44.

[0055] The sixth shaft S62, the first-gear driving wheel 31, and the second-gear driving wheel 32 can be separate parts or can be constructed as a duplex gear shaft. The front-drive driving wheel 41 is located between the third-gear driven wheel 38 and the fourth-gear driven wheel 39, minimizing axial space requirements. The fifth-gear driving wheel 35 and the fifth-gear driven wheel 30 are located midway between the sixth shaft S62 and the eighth shaft S8, respectively. Since the load is minimized in fifth gear, deformation of the sixth shaft S62 and the eighth shaft S8 can be minimized, enhancing the reliability of the synchronizer transmission unit 30A. The first- and second-gear shift mechanism 310, the third- and fourth-gear shift mechanism 320, and the fifth-gear shift mechanism 330 can be structures such as sliding sleeves or synchronizers, enabling manual shifting or program-controlled automatic shifting.

[0056] Referring to Table 1 and Table 2, the power shift unit 10A can realize 6 forward gears and 3 reverse gears, and the synchronizer transmission unit 30A can realize 5 gears. In this embodiment, a maximum of 30 forward gears and 15 reverse gears can be realized according to actual needs.

[0057] Another embodiment provided by the present invention is a power shift transmission including a power shift unit 10A, a climbing gear unit 20A and a synchronizer transmission unit 30A. The structures of the power shift unit 10A and the synchronizer transmission unit 30A are the same as those of the previous embodiment. The climbing gear unit 20A is arranged between the power shift unit 10A and the synchronizer transmission unit 30A, and includes a climbing gear unit sixth shaft S61 and a seventh shaft S7 arranged parallel to each other. One end of the climbing gear unit sixth shaft S61 is connected to the fourth shaft S4 through a second connecting sleeve 26, and the other end is connected to the sixth shaft S62. A climbing gear shift mechanism 25 is provided on the climbing gear unit sixth shaft S61, and the climbing gear shift mechanism 25 is connected to the climbing gear unit sixth shaft S61 through a spline. The climbing gear first driving wheel 21 is connected to the second connecting sleeve 26. The climbing gear first driven wheel 22 and the climbing gear second driving wheel 23 are connected to the seventh shaft. The climbing gear second driven wheel 24 is loosely sleeved on the climbing gear unit sixth shaft S61.

[0058] The power transmission from the fourth shaft S4 to the sixth shaft S61 of the climbing gear unit is:

[0059] (1) Direct gear: the climbing gear shift mechanism 25 is combined with the climbing gear first driving wheel 21, and the power is transmitted from the fourth shaft S4 through the second connecting sleeve 26, the climbing gear first driving wheel 21 and the climbing gear shift mechanism 25 to the climbing gear unit sixth shaft S61;

[0060] (2) Climbing gear, the climbing gear shifting mechanism 25 is combined with the second driven gear 24 of the climbing gear, and the power is transmitted from the fourth shaft S4 through the second connecting sleeve 26, the first driving gear 21 of the climbing gear, the first driven gear 22 of the climbing gear, the seventh shaft S7, the second driving gear 23 of the climbing gear, the second driven gear 24 of the climbing gear and the climbing gear shifting mechanism 25 to the sixth shaft S61 of the climbing gear unit.

[0061] Referring to Tables 1 and 2, the power shift unit 10A can achieve 6 forward gears and 3 reverse gears, the crawler unit 20A can achieve 2 gears, and the synchronizer transmission unit 30A can achieve 5 gears. That is, in this embodiment, 6*2*5 = 60 forward gears and 3*2*5 = 30 reverse gears can be achieved. If the gear arrangement includes overlapping speed ratios, known mechanical design methods can be used to lock the gears or electronic control methods can be used to limit gear selection to reduce the overlapping speed ratios. When the crawler unit 20A is in the crawler gear, the speed ratio range of the synchronizer transmission unit 30A in 5th gear overlaps with the speed ratio range when the crawler unit is in normal gear and the synchronizer transmission unit is in 1st gear. In this case, the crawler gear range can be locked when the synchronizer is in 5th gear, achieving a total of 54 forward gears.

[0062] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A power shift transmission, characterized in that: It comprises a power shift unit (10A) and a synchronizer transmission unit (30A), wherein one end of the power shift unit (10A) is connected to a power input device (A), and the other end is connected to the synchronizer transmission unit (30A); The power shift unit (10A) comprises an input shaft (S1), a hollow shaft (S2), a third shaft (S3) and a fourth shaft (S4) arranged in parallel with each other; the input shaft (S1) transmits power to the hollow shaft (S2) through a first clutch unit, or the input shaft (S1) transmits power to the hollow shaft (S2) through a first gear unit, a third shaft (S3) and a second clutch unit; the hollow shaft (S2) transmits power to the fourth shaft (S4) through a second gear unit and a third clutch unit, or the hollow shaft (S2) transmits power to the fourth shaft (S4) through a third gear unit and a fourth clutch unit; The synchronizer transmission unit (30A) comprises a sixth shaft (S62) and an eighth shaft (S8) arranged in parallel with each other, wherein the sixth shaft (S62) is sleeved on the fourth shaft (S4); the sixth shaft (S62) transmits power to the eighth shaft (S8) through a first-second gear shift mechanism (310) in combination with a fourth gear unit or a fifth gear unit, or the sixth shaft (S62) transmits power to the eighth shaft (S8) through a third-fourth gear shift mechanism (320) in combination with a sixth gear unit or a seventh gear unit, or the sixth shaft (S62) transmits power to the eighth shaft (S8) through a fifth-speed gear shift mechanism (330) in combination with an eighth gear unit.

2. A power shift transmission according to claim 1, characterized in that: The first gear unit includes a first gear set, a second gear set and a third gear set, wherein the first gear set includes an input shaft gear (11) and a third shaft input wheel (12) that are meshed with each other, the second gear set includes a mid-gear driving wheel (14) and a forward gear idler wheel (16) that are meshed with each other, the third gear set includes a low-gear driving wheel (15), a reverse gear idler wheel (17) and a reverse gear idler wheel (18), the low-gear driving wheel (15) is meshed with the reverse gear idler wheel (17) through the reverse gear idler wheel (18); the second gear unit includes a fourth gear set and a fifth gear set, wherein the fourth gear set includes a mid-gear driving wheel (14) and a mid-gear driven wheel (20) that are meshed with each other, the fifth gear set includes a low-gear driving wheel (15), a reverse gear idler wheel (17) and a reverse gear idler wheel (18), the low-gear driving wheel (15) is meshed with the reverse gear idler wheel (17) through the reverse gear idler wheel (18); The gear set comprises a low-gear driven wheel (10) and a low-gear driving wheel (15) meshed with each other; the third gear unit comprises a high-gear driving wheel (13) and a high-gear driven wheel (19) meshed with each other; the fourth gear unit comprises a first-gear driving wheel (31) and a first-gear driven wheel (36) meshed with each other; the fifth gear unit comprises a second-gear driving wheel (32) and a second-gear driven wheel (37) meshed with each other; the sixth gear unit comprises a third-gear driving wheel (33) and a third-gear driven wheel (38) meshed with each other; the seventh gear unit comprises a fourth-gear driving wheel (34) and a fourth-gear driven wheel (39) meshed with each other; and the eighth gear unit comprises a fifth-gear driving wheel (35) and a fifth-gear driven wheel (30) meshed with each other.

3. A power shift transmission according to claim 1, characterized in that: The first clutch unit is a first wet clutch (110), the outer hub of the first wet clutch (110) is connected to the input shaft (S1), and the inner hub is connected to the hollow shaft (S2); the second clutch unit is a second wet clutch (120) and a third wet clutch (130) sharing a common outer hub, the outer hubs of the second wet clutch (120) and the third wet clutch (130) are connected to the third shaft (S3); the third clutch unit is a fourth wet clutch (140) and a fifth wet clutch (150) sharing a common outer hub, the outer hubs of the fourth wet clutch (140) and the fifth wet clutch (150) are connected to the fourth shaft (S4); the fourth clutch unit is a sixth wet clutch (160), the outer hub of the sixth wet clutch (160) is connected to the fourth shaft (S4).

4. A power shift transmission according to claim 1, characterized in that: The input shaft (S1) is sleeved on the ninth shaft (S9) via a first connecting sleeve (111), and the power input device (A) drives the PTO via the input shaft (S1), the first connecting sleeve (111) and the ninth shaft (S9).

5. The power shift transmission according to claim 1, wherein: One end of the eighth shaft (S8) is connected to the rear axle (B), and the eighth shaft (S8) transmits power to the rear axle (B).

6. A power shift transmission according to claim 1, characterized in that: The eighth shaft (S8) is sequentially connected to a front drive input shaft (43) and a front drive output shaft (44) via a ninth gear unit. A seventh wet clutch (40) is provided on the front drive input shaft (43) to transmit power from the eighth shaft (S8) to the front axle (C).

7. A power shift transmission according to claim 6, characterized in that: The ninth gear unit comprises a front drive driving wheel (41) and a front drive driven wheel (42) that are meshed with each other, the front drive driving wheel (41) is connected to the eighth shaft (S8), and the front drive driven wheel (42) is connected to the front drive input shaft (43).

8. A power shift transmission according to any one of claims 1 to 7, characterized in that: A climbing gear unit (20A) is connected between the power shift unit (10A) and the synchronizer transmission unit (30A). The climbing gear unit (20A) includes a sixth shaft (S61) and a seventh shaft (S7) of the climbing gear unit that are arranged in parallel with each other. One end of the sixth shaft (S61) of the climbing gear unit is connected to the fourth shaft (S4) through a second connecting sleeve (26), and the other end is connected to the sixth shaft (S62). A climbing gear shift mechanism (25) is provided on the sixth shaft (S61) of the climbing gear unit. The fourth shaft (S4) transmits power to the sixth shaft (S61) of the climbing gear unit through the second connecting sleeve (26), the first driving wheel (21) of the climbing gear and the climbing gear shifting mechanism (25), or the fourth shaft (S4) transmits power to the sixth shaft (S61) of the climbing gear unit through the second connecting sleeve (26), the first driving wheel (21) of the climbing gear, the first passive wheel (22) of the climbing gear, the seventh shaft (S7), the second driving wheel (23) of the climbing gear, the second passive wheel (24) of the climbing gear and the climbing gear shifting mechanism (25).

9. A power shift transmission according to claim 8, characterized in that: The other ends of the seventh shaft (S7) and the eighth shaft (S8) are rotatably connected.

10. The power shift transmission according to claim 1, wherein: The power input device (A) is an engine.

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