Power output unit assembly

Abstract

The utility model relates to a transmission system, in particular to a power output unit assembly, and aims to solve the problems that an existing power output unit is single in output function, single in purpose, poor in adaptability with agricultural implements or insufficient in universality. The clutch assembly comprises a clutch assembly and a power output unit connected with the clutch assembly, the clutch assembly is a double-clutch assembly and comprises a first power input shaft, a second power input shaft, a right-end clutch baffle and related components, and the first power input shaft is sleeved with the second power input shaft in an empty mode. The input end of the power output unit is a combination of a high-gear driving gear and an input shaft, and the output end is a power output unit output shaft. According to the clutch assembly, the combination mode of the double clutches, the first power input shaft and the second power input shaft is adopted, meanwhile, the shape of the clutch baffle at the right end is improved so that the double clutches can be matched conveniently, the integration degree is high, and the internal space of a transmission box body is saved.

Description

Technical Field

[0001] The utility model relates to a transmission system, in particular to a power output unit assembly. Background Art

[0002] The power output unit is the core output component of the transmission system. Especially in agricultural machinery, the power output unit is used to drive agricultural machinery and provide it with rotational speed and power, such as driving rotary tillage implements or harvesting implements, etc.

[0003] At present, with the rapid development of agricultural tractors and supporting agricultural implements, and the popularization of new intelligent large-horsepower tractors (usually equipped with a power shift unit or CVT (Continuously Variable Transmission)), there is an urgent need in the market for a multi-purpose power output unit that matches agricultural implements.

[0004] The input rotational speeds required by existing agricultural implements are mainly divided into two categories: 1) input at a constant rotational speed; 2) input at a rotational speed that is positively correlated with the vehicle speed. However, the existing power output units cannot meet both of the above requirements at the same time, making the combination of "large-horsepower intelligent tractor + traditional power output unit" only able to meet a small part of agricultural needs, greatly reducing the utilization rate and adaptability of agricultural vehicles, resulting in a waste of resources. The existing power output units have problems such as single output function, single use, and poor adaptability to agricultural implements.

[0005] Chinese Patent CN110925392B discloses a tractor multi-gear full-power take-off and its take-off method. The structure of the power output unit disclosed therein can only be adapted to a single clutch assembly and cannot be adapted to a dual clutch assembly, with insufficient versatility. Summary of the Utility Model

[0006] The purpose of the utility model is to solve the problems of the existing power output unit, such as single output function, single use, poor adaptability to agricultural implements, or insufficient versatility, and to provide a power output unit assembly.

[0007] To achieve the above purpose, the technical solution provided by the utility model is as follows:

[0008] A power output unit assembly includes a clutch assembly arranged in a transmission gearbox and a power output unit connected to the clutch assembly. The power output unit includes an input end and an output end. The input end is a combination of a high-gear driving gear and an input shaft, and the output end is the output shaft of the power output unit. The special feature is that:

[0009] The clutch assembly is a dual-clutch assembly, including a first power input shaft, a second power input shaft sleeved on one end of the first power input shaft in an idle state, a second power input shaft input gear sleeved on one end of the second power input shaft and fixedly connected thereto, and a clutch unit;

[0010] The clutch unit includes a clutch hub coaxially arranged outside the other ends of the first power input shaft and the second power input shaft, a right-end clutch baffle and a left-end clutch baffle respectively connected to both ends of the clutch hub, and two piston supports, a first clutch inner ring and a second clutch inner ring, two pairs of friction plates and two friction plate groups arranged inside the clutch hub, and two pistons respectively arranged inside the two piston supports;

[0011] A right-end output shaft is coaxially arranged at the outer end of the right-end clutch baffle; the first clutch inner ring and the second clutch inner ring are respectively arranged at the left end and the right end inside the clutch hub, and are respectively fixedly connected to the second power input shaft input gear and the first power input shaft;

[0012] Each pair of friction plates includes X pairs of friction plates, X≥4, and each friction plate group includes X - 1 friction plates. The X pairs of friction plates and the X - 1 friction plates are arranged at intervals; the friction plates of one friction plate group cooperate with the first clutch inner ring, and the friction plates of the other friction plate group cooperate with the second clutch inner ring; each pair of friction plates cooperates with the clutch hub;

[0013] One of the piston supports is fixedly connected to the first power input shaft, and the other piston support is fixedly connected to the second power input shaft; a piston cavity for filling hydraulic oil is arranged between the piston and the piston support;

[0014] The high-speed gear driving gear and input shaft combination includes a third shaft and a high-speed gear driving gear sleeved and fixedly connected on the third shaft. The input end of the third shaft is connected to the output end of the right-end output shaft.

[0015] Further, it also includes a first left-end support bearing of the first power input shaft with an outer ring connected to the transmission case body and an inner ring connected to the first power input shaft, a second left-end support bearing of the second power input shaft with an outer ring connected to the transmission case body and an inner ring connected to the second power input shaft, a first needle bearing with an outer ring connected to the second power input shaft and an inner ring connected to the first power input shaft, and a thrust bearing with a left end connected to the second power input shaft and a right end connected to the first power input shaft.

[0016] Further, it also includes a first right-end support bearing of the first power input shaft with an outer ring connected to the right-end clutch baffle and an inner ring connected to the first power input shaft.

[0017] Further, a first shaft snap ring is arranged on the second power input shaft to limit and fix the second power input shaft input gear and the piston support arranged on the second power input shaft; a second shaft snap ring is arranged on the first power input shaft to limit and fix the first power input shaft and the piston support connected thereto;

[0018] A disc spring baffle, a disc spring and a third shaft snap ring are arranged on each piston support and located between the piston support and the inner ring of the first clutch or the inner ring of the second clutch. The disc spring baffle is arranged at the end of the piston support away from the piston and is limited and fixed by a third shaft snap ring arranged on the piston support. One end of the disc spring contacts the disc spring baffle, and the other end contacts the piston;

[0019] The left end clutch baffle and the right end clutch baffle are axially limited and fixed to the clutch hub by a first hole snap ring; the side of the first needle bearing close to the thrust bearing is axially limited and fixed by a second hole snap ring arranged on the second power input shaft.

[0020] Further, each piston is hermetically connected to the corresponding piston support by two sealing rings; one piston support is connected to the first power input shaft by a spline, and the other piston support is connected to the second power input shaft by a spline; the second power input shaft is fixedly connected to the second power input shaft input gear by a spline; the friction plate is in spline fit with the inner ring of the first clutch or the inner ring of the second clutch; each counter plate is in spline fit with the clutch hub; the input end of the third shaft is connected to the output end of the right end output shaft by a spline.

[0021] Further, the power output unit further includes a power output unit housing, a front output shaft, a shift fork shaft arranged on the power output unit housing, a low-medium gear synchronizer shift fork and a high gear synchronizer shift fork connected to the shift fork shaft, an input shaft right end support bearing with an outer ring connected to the power output unit housing and an inner ring connected to the third shaft combined with the high gear driving gear and the input shaft, an output shaft left end support bearing with an outer ring connected to the transmission case and an inner ring connected to the front output shaft, and an output shaft right end support bearing with an outer ring connected to the output unit housing and an inner ring connected to the front output shaft;

[0022] It further includes a low-medium gear synchronizer sleeve, a medium gear driving gear, a low gear driving gear, a second needle bearing, a low-medium gear synchronizer base, a high gear driven gear, a high gear synchronizer sleeve, a third needle bearing, a high gear synchronizer base, a medium gear driven gear, and a low gear driven gear;

[0023] The low and medium speed synchronizer base is fixedly sleeved on the third shaft of the high speed driving gear and the input shaft assembly. The low speed driving gear is sleeved on the low and medium speed synchronizer base through a second needle roller bearing and meshes with the low speed driven gear. The medium speed driving gear is sleeved on the low and medium speed synchronizer base through a second needle roller bearing and meshes with the medium speed driven gear. The high speed driving gear of the high speed driving gear and the input shaft assembly meshes with the high speed driven gear.

[0024] The high speed synchronizer base is fixedly sleeved on the front output shaft. The high speed driven gear is sleeved on the high speed synchronizer base through a third needle roller bearing. The high speed synchronizer sliding sleeve is slidably sleeved on the high speed synchronizer base and connected to the high speed synchronizer fork. The low and medium speed synchronizer sliding sleeve is slidably sleeved on the low and medium speed synchronizer base and is located between the medium speed driving gear and the low speed driving gear. The low and medium speed synchronizer sliding sleeve is connected to the low and medium speed synchronizer fork.

[0025] The front output shaft is fixedly connected to the output shaft of the power output unit.

[0026] The left end support bearing of the output shaft and the right end support bearing of the output shaft are jointly used to support the front output shaft.

[0027] Further, the front output shaft and the output shaft of the power output unit are fixedly connected by bolts and an output shaft pressing plate.

[0028] A nut is arranged at one end of the front output shaft far from the output shaft of the power output unit to limit and fix the left end support bearing of the output shaft.

[0029] Further, X = 4.

[0030] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0031] 1. For the power output unit assembly provided by the present utility model, its clutch assembly adopts a dual clutch and the combination form of a first power input shaft and a second power input shaft. At the same time, the shape of the right end clutch baffle is improved to adapt to the structure of the dual clutch, and it is also used to support the power input shaft of the clutch assembly, with high integration and saving the internal space of the transmission box.

[0032] 2. For the power output unit assembly provided by the present utility model, the high speed driving gear and the input shaft assembly in the power output unit can cooperate with the right end clutch baffle in the clutch assembly, so as to improve the adaptability and utilization rate of the power output unit, and it has strong versatility and is suitable for many mainstream agricultural vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of an embodiment of a power output unit assembly of the present utility model;

[0034] Figure 2 The sectional view of the clutch assembly in an embodiment of a power output unit assembly of the present utility model;

[0035] Figure 3 The sectional view of the power output unit in an embodiment of a power output unit assembly of the present utility model;

[0036] Figure 4 The structural schematic diagram of an embodiment of a power output unit assembly of the present utility model;

[0037] Explanation of reference numerals:

[0038] 1 - First power input shaft, 2 - Left - end support bearing of the first power input shaft, 3 - Second power input shaft, 4 - Left - end support bearing of the second power input shaft, 5 - Input gear of the second power input shaft, 6 - First shaft retaining ring, 7 - Disc spring baffle, 8 - Disc spring, 9 - Piston, 10 - Sealing ring, 11 - Second shaft retaining ring, 12 - First hole retaining ring, 13 - Left - end clutch baffle, 14 - Counterpart plate, 15 - Clutch hub, 16 - First needle roller bearing, 17 - Second hole retaining ring, 18 - Thrust bearing, 19 - Piston support, 20 - Friction plate, 21 - Third shaft retaining ring, 22 - Right - end support bearing of the first power input shaft, 23 - Right - end clutch baffle, 24 - Low - and - medium - gear synchronizer fork, 25 - Low - and - medium - gear synchronizer sleeve, 26 - Medium - gear driving gear, 27 - High - gear driving gear and input shaft assembly, 28 - Power output unit housing, 29 - Low - gear driving gear, 30 - Second needle roller bearing, 31 - Low - and - medium - gear synchronizer base, 32 - Right - end support bearing of the input shaft, 33 - High - gear driven gear, 34 - High - gear synchronizer sleeve, 35 - Third needle roller bearing, 36 - High - gear synchronizer base, 37 - Nut, 38 - Front output shaft, 39 - Left - end support bearing of the output shaft, 40 - High - gear synchronizer fork, 41 - Fork shaft, 42 - Medium - gear driven gear, 43 - Low - gear driven gear, 44 - Power output unit output shaft, 45 - Output shaft pressing plate, 46 - Bolt, 47 - Right - end support bearing of the output shaft. Detailed implementation manners

[0039] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0040] A power output unit assembly, referring to Figure 1 , includes a clutch assembly A arranged in a transmission case and a power output unit B connected to the clutch assembly A. The power output unit B includes an input end and an output end. The input end is a high - gear driving gear and input shaft assembly 27, and the output end is a power output unit output shaft 44;

[0041] Referring to Figure 2 andFigure 4 , the clutch assembly A is a dual-clutch assembly, including a first power input shaft 1, a second power input shaft 3 sleeved on one end of the first power input shaft 1, a second power input shaft input gear 5 sleeved on one end of the second power input shaft 3 and fixedly connected thereto by splines, a first power input shaft left-end support bearing 2 with an outer ring connected to the transmission housing and an inner ring connected to the first power input shaft 1, a second power input shaft left-end support bearing 4 with an outer ring connected to the transmission housing and an inner ring connected to the second power input shaft 3, a first needle bearing 16 with an outer ring connected to the second power input shaft 3 and an inner ring connected to the first power input shaft 1, a thrust bearing 18 with a left end connected to the second power input shaft 3 and a right end connected to the first power input shaft 1, a first power input shaft right-end support bearing 22 with an outer ring connected to the right-end clutch baffle 23 and an inner ring connected to the first power input shaft 1, and a clutch unit;

[0042] The clutch unit includes a clutch hub 15 coaxially arranged outside the other ends of the first power input shaft 1 and the second power input shaft 3, a right-end clutch baffle 23 and a left-end clutch baffle 13 respectively connected to both ends of the clutch hub 15, and two piston supports 19, a first clutch inner ring and a second clutch inner ring, two pairs of counter plates and two friction plate groups arranged inside the clutch hub 15, and two pistons 9 respectively arranged inside the two piston supports 19;

[0043] A right-end output shaft is coaxially arranged at the outer end of the right-end clutch baffle 23; the first clutch inner ring and the second clutch inner ring are respectively arranged at the left end and the right end inside the clutch hub 15, and are respectively fixedly connected to the second power input shaft input gear 5 and the first power input shaft 1;

[0044] Each pair of counter plates includes four counter plates 14, each friction plate group includes three friction plates 20, and the four counter plates 14 and the three friction plates 20 are arranged at intervals; the friction plates 20 of one friction plate group are fitted with the first clutch inner ring by splines, and the friction plates 20 of the other friction plate group are fitted with the second clutch inner ring by splines; each counter plate 14 is fitted with the clutch hub 15 by splines;

[0045] One of the piston supports 19 is fixedly connected to the first power input shaft 1, and the other piston support 19 is fixedly connected to the second power input shaft 3; a piston chamber for filling hydraulic oil is arranged between the piston 9 and the piston support 19;

[0046] The high-speed gear driving gear and input shaft assembly 27 includes a third shaft and a high-speed gear driving gear sleeved and fixedly connected on the third shaft, and the input end of the third shaft is connected to the output end of the right-end output shaft by splines.

[0047] To fix and seal the relevant components within the clutch assembly A, a first shaft snap ring 6 disposed on the second power input shaft 3 is used to limit and fix the second power input shaft input gear 5 and the piston support 19 disposed on the second power input shaft 3; a second shaft snap ring 11 disposed on the first power input shaft 1 is used to limit and fix the first power input shaft 1 and the piston support 19 connected thereto;

[0048] On each piston support 19 and at the position between the piston support 19 and the inner ring of the first clutch or the inner ring of the second clutch, a disc spring baffle 7, a disc spring 8 and a third shaft snap ring 21 are provided. The disc spring baffle 7 is disposed at the end of the piston support 19 away from the piston 9 and is limited and fixed by the third shaft snap ring 21 disposed on the piston support 19. One end of the disc spring 8 contacts the disc spring baffle 7, and the other end contacts the piston 9; the piston support 19 guides the piston 9. When hydraulic oil enters the piston chamber, the piston 9 is pushed to displace, so that the corresponding friction plate 20 and the mating plate 14 are pressed together, and the corresponding clutch starts to transmit rotational speed and torque. When the hydraulic oil stops entering the piston chamber, the piston 9 returns under the action of the disc spring 8, and the friction plate 20 and the mating plate 14 in the clutch separate, and the corresponding clutch stops working.

[0049] Both the left-end clutch baffle 13 and the right-end clutch baffle 23 are axially limited and fixed to the clutch hub 15 by a first hole snap ring 12; one side of the first needle bearing 16 close to the thrust bearing 18 is axially limited and fixed by a second hole snap ring 17 disposed on the second power input shaft 3. Each piston 9 is hermetically connected to the corresponding piston support 19 by two sealing rings 10.

[0050] See Figure 3 and Figure 4 , it further includes a power output unit housing 28, a front output shaft 38, a shift fork shaft 41 disposed on the power output unit housing 28, a low-medium gear synchronizer shift fork 24 and a high gear synchronizer shift fork 40 connected to the shift fork shaft 41, an input shaft right-end support bearing 32 whose outer ring is connected to the power output unit housing 28 and whose inner ring is connected to the third shaft of the high gear driving gear and input shaft assembly 27, an output shaft left-end support bearing 39 whose outer ring is connected to the transmission case and whose inner ring is connected to the front output shaft 38, and an output shaft right-end support bearing 47 whose outer ring is connected to the output unit housing 28 and whose inner ring is connected to the front output shaft 38;

[0051] It further includes a low-medium gear synchronizer sleeve 25, a medium gear driving gear 26, a low gear driving gear 29, a second needle bearing 30, a low-medium gear synchronizer base 31, a high gear driven gear 33, a high gear synchronizer sleeve 34, a third needle bearing 35, a high gear synchronizer base 36, a medium gear driven gear 42, a low gear driven gear 43;

[0052] The low and medium gear synchronizer base 31 is fixedly sleeved on the third shaft of the high gear driving gear and input shaft assembly 27. The low gear driving gear 29 is sleeved on the low and medium gear synchronizer base 31 through the second needle bearing 30 and meshes with the low gear driven gear 43; the medium gear driving gear 26 is sleeved on the low and medium gear synchronizer base 31 through the second needle bearing 30 and meshes with the medium gear driven gear 42; the high gear driving gear of the high gear driving gear and input shaft assembly 27 meshes with the high gear driven gear 33;

[0053] The high gear synchronizer base 36 is fixedly sleeved on the front output shaft 38. The high gear driven gear 33 is sleeved on the high gear synchronizer base 36 through the third needle bearing 35; the high gear synchronizer sliding sleeve 34 is slidably sleeved on the high gear synchronizer base 36 and is connected to the high gear synchronizer fork 40; the low and medium gear synchronizer sliding sleeve 25 is slidably sleeved on the low and medium gear synchronizer base 31 and is located between the medium gear driving gear 26 and the low gear driving gear 29. The low and medium gear synchronizer sliding sleeve 25 is connected to the low and medium gear synchronizer fork 24;

[0054] The front output shaft 38 and the power output unit output shaft 44 are fixedly connected by bolts 46 and the output shaft pressing plate 45; a nut 37 is arranged at one end of the front output shaft 38 away from the power output unit output shaft 44 for limiting and fixing the output shaft left end support bearing 39.

[0055] It should be noted that the low and medium gear synchronizer fork 24, the low and medium gear synchronizer sliding sleeve 25, the low and medium gear synchronizer base 31 and the fork shaft 41 constitute the low and medium gear synchronizer; the high gear synchronizer fork 40, the high gear synchronizer base 36, the high gear synchronizer sliding sleeve 34 and the fork shaft 41 constitute the high gear synchronizer. A set of disc spring baffles 7, disc springs 8, pistons 9, counter plates 14, friction plates 20, piston supports 19 and clutch hubs 15 near the second power input shaft input gear 5 constitute the left end clutch, and a set of disc spring baffles 7, disc springs 8, pistons 9, counter plates 14, friction plates 20, piston supports 19 and clutch hubs 15 near the right end clutch baffle 23 constitute the right end clutch, where the clutch hub 15 is a common part of the two clutches. The inner ring of the second clutch is the inner ring of the right end clutch, the inner ring of the first clutch is the inner ring of the left end clutch, and the combination of the right end clutch and the left end clutch is a dual clutch.

[0056] The following describes the transmission route of this embodiment with reference to Table 1;

[0057] Table 1 Output speed conditions of the power output unit output shaft in each gear

[0058] Corresponding gear position Output speed of the output shaft of the power output unit A Output a low speed (constant speed) that is positively correlated with the engine speed B Output a medium speed (constant speed) that is positively correlated with the engine speed C Output a high speed (constant speed) that is positively correlated with the engine speed D Output a low speed that is positively correlated with the vehicle speed E Output a medium speed that is positively correlated with the vehicle speed F Output a high speed that is positively correlated with the vehicle speed

[0059] Gear A: The right clutch in the dual clutch is engaged. The sliding sleeve 25 of the low and medium gear synchronizer is engaged with the low gear at the right end, and the sliding sleeve 34 of the high gear synchronizer is in the neutral position in the middle. The power transmission route is: the first power input shaft 1 → dual clutch → clutch hub 15 → right clutch baffle 23 → high gear driving gear and input shaft assembly 27 → low and medium gear synchronizer → low gear driving gear 29 → low gear driven gear 43 → front output shaft 38 → power output unit output shaft 44.

[0060] Gear B: The right clutch in the dual clutch is engaged. The sliding sleeve 25 of the low and medium gear synchronizer is engaged with the medium gear at the left end, and the sliding sleeve 34 of the high gear synchronizer is in the neutral position in the middle. The power transmission route is: the first power input shaft 1 → dual clutch → clutch hub 15 → right clutch baffle 23 → high gear driving gear and input shaft assembly 27 → low and medium gear synchronizer → medium gear driving gear 26 → medium gear driven gear 42 → front output shaft 38 → power output unit output shaft 44.

[0061] Gear C: The right clutch in the dual clutch is engaged. The sliding sleeve 25 of the low and medium gear synchronizer is in the neutral position in the middle, and the sliding sleeve 34 of the high gear synchronizer is engaged with the high gear at the left end. The power transmission route is: the first power input shaft 1 → dual clutch → clutch hub 15 → right clutch baffle 23 → high gear driving gear and input shaft assembly 27 → high gear driven gear 33 → high gear synchronizer → front output shaft 38 → power output unit output shaft 44.

[0062] Gear D: The left clutch in the dual clutch is engaged. The sliding sleeve 25 of the low and medium gear synchronizer is engaged with the low gear at the right end, and the sliding sleeve 34 of the high gear synchronizer is in the neutral position in the middle. The power transmission route is: the second power input shaft 3 → dual clutch → clutch hub 15 → right clutch baffle 23 → high gear driving gear and input shaft assembly 27 → low and medium gear synchronizer → low gear driving gear 29 → low gear driven gear 43 → front output shaft 38 → power output unit output shaft 44.

[0063] Gear E: The left clutch in the dual clutch is engaged. The sliding sleeve 25 of the low and medium gear synchronizer is engaged with the medium gear at the left end, and the sliding sleeve 34 of the high gear synchronizer is in the neutral position in the middle. The power transmission route is: the second power input shaft 3 → dual clutch → clutch hub 15 → right clutch baffle 23 → high gear driving gear and input shaft assembly 27 → low and medium gear synchronizer → medium gear driving gear 26 → medium gear driven gear 42 → front output shaft 38 → power output unit output shaft 44.

[0064] F gear: The left clutch in the dual clutch is in the engaged state. The low-medium gear synchronizer sliding sleeve 25 is in the middle neutral position, and the sliding sleeve 34 of the high gear synchronizer is in the left engaged high gear position. The power transmission route is: the second power input shaft 3 → dual clutch → clutch hub 15 → right clutch baffle 23 → high gear driving gear and input shaft assembly 27 → high gear driven gear 33 → high gear synchronizer → front output shaft 38 → power output unit output shaft 44.

[0065] When using the power output unit B in the case of some tractors without the PTO mode, the gear positions A, B, and C output low, medium, and high speeds that are positively correlated with the engine speed. At this time, since the engine speed is variable, the output speed is not a constant value.

[0066] The clutch assembly of this embodiment adopts a dual clutch and the combination form of the first power input shaft 1 and the second power input shaft 3. At the same time, the shape of the right clutch baffle 23 is improved to facilitate the adaptation to the dual clutch, with high integration and saving the internal space of the transmission case. At the same time, the high gear driving gear and input shaft assembly 27 in its power output unit can cooperate with the right clutch baffle 23 in the clutch assembly, thereby improving the adaptability and utilization rate of the power output unit, and having strong versatility and being suitable for many mainstream agricultural vehicles. Additionally, through the dual clutch, multiple synchronizers, and multiple transmission gear positions, this embodiment can output a constant speed and a speed positively correlated with the vehicle speed, greatly broadening the usage scenarios.

Claims

1. A power output unit assembly, comprising a clutch assembly (A) disposed within a transmission case and a power output unit (B) connected to the clutch assembly (A). The power output unit (B) includes an input end and an output end. The input end is a high gear driving gear and input shaft combination (27), and the output end is a power output unit output shaft (44); characterized in that: The clutch assembly (A) is a dual clutch assembly, including a first power input shaft (1), a second power input shaft (3) sleeved on one end of the first power input shaft (1), a second power input shaft input gear (5) sleeved on and fixedly connected to one end of the second power input shaft (3), and a clutch unit; The clutch unit includes a clutch hub (15) coaxially disposed outside the other ends of the first power input shaft (1) and the second power input shaft (3), a right end clutch baffle (23) and a left end clutch baffle (13) respectively connected to both ends of the clutch hub (15), and two piston supports (19), a first clutch inner ring and a second clutch inner ring, two pairs of plates groups and two friction plate groups disposed within the clutch hub (15), and two pistons (9) respectively disposed within the two piston supports (19); A right end output shaft is coaxially disposed at the outer end of the right end clutch baffle (23); the first clutch inner ring and the second clutch inner ring are respectively disposed at the left end and the right end inside the clutch hub (15), and are respectively fixedly connected to the second power input shaft input gear (5) and the first power input shaft (1); Each pair of plates group includes X pairs of plates (14), where X≥4, and each friction plate group includes X - 1 friction plates (20). The X pairs of plates (14) and the X - 1 friction plates (20) are arranged at intervals; the friction plates (20) of one friction plate group cooperate with the first clutch inner ring, and the friction plates (20) of the other friction plate group cooperate with the second clutch inner ring; each pair of plates (14) cooperates with the clutch hub (15); One of the piston supports (19) is fixedly connected to the first power input shaft (1), and the other piston support (19) is fixedly connected to the second power input shaft (3); a piston cavity for filling hydraulic oil is provided between the piston (9) and the piston support (19); The high gear driving gear and input shaft combination (27) includes a third shaft and a high gear driving gear sleeved on and fixedly connected to the third shaft. The input end of the third shaft is connected to the output end of the right end output shaft.

2. The power output unit assembly according to claim 1, characterized in that: It further includes a first power input shaft left end support bearing (2) with an outer ring connected to the transmission case and an inner ring connected to the first power input shaft (1), a second power input shaft left end support bearing (4) with an outer ring connected to the transmission case and an inner ring connected to the second power input shaft (3), a first needle bearing (16) with an outer ring connected to the second power input shaft (3) and an inner ring connected to the first power input shaft (1), and a thrust bearing (18) with a left end connected to the second power input shaft (3) and a right end connected to the first power input shaft (1).

3. The power output unit assembly according to claim 2, wherein: It further includes a right-end support bearing (22) of the first power input shaft, whose outer ring is connected to the right-end clutch baffle (23) and inner ring is connected to the first power input shaft (1).

4. The power output unit assembly according to claim 3, wherein: The second power input shaft input gear (5) and the piston support (19) arranged on the second power input shaft (3) are limited and fixed by two first shaft circlips (6) arranged on the second power input shaft (3); between the first power input shaft (1) and the piston support (19) connected thereto is limited and fixed by a second shaft circlip (11) arranged on the first power input shaft (1); On each piston support (19) and at the position between the piston support (19) and the inner ring of the first clutch or the inner ring of the second clutch, there are arranged a disc spring baffle (7), a disc spring (8) and a third shaft circlip (21). The disc spring baffle (7) is arranged at the end of the piston support (19) far from the piston (9) and is limited and fixed by the third shaft circlip (21) arranged on the piston support (19). One end of the disc spring (8) contacts the disc spring baffle (7), and the other end contacts the piston (9); Between the left-end clutch baffle (13) and the right-end clutch baffle (23) and the clutch hub (15) are axially limited and fixed by first hole circlips (12); on the side of the first needle roller bearing (16) close to the thrust bearing (18) is axially limited and fixed by a second hole circlip (17) arranged on the second power input shaft (3).

5. The power output unit assembly according to claim 4, wherein: Between each piston (9) and the corresponding piston support (19) are hermetically connected by two sealing rings (10); one of the piston supports (19) is connected to the first power input shaft (1) by splines, and the other piston support (19) is connected to the second power input shaft (3) by splines; between the second power input shaft (3) and the second power input shaft input gear (5) is fixedly connected by splines; the friction plate (20) is in spline fit with the inner ring of the first clutch or the inner ring of the second clutch; each counter plate (14) is in spline fit with the clutch hub (15); the input end of the third shaft is connected to the output end of the right-end output shaft by splines.

6. The power output unit assembly according to claim 1, wherein: The power output unit (B) further includes a power output unit housing (28), a front output shaft (38), a shift fork shaft (41) provided on the power output unit housing (28), a low-medium gear synchronizer shift fork (24) and a high gear synchronizer shift fork (40) connected to the shift fork shaft (41), a right-end support bearing (32) of the input shaft with an outer ring connected to the power output unit housing (28) and an inner ring connected to the third shaft of the high gear driving gear and the input shaft assembly (27), a left-end support bearing (39) of the output shaft with an outer ring connected to the transmission case and an inner ring connected to the front output shaft (38), and a right-end support bearing (47) of the output shaft with an outer ring connected to the output unit housing (28) and an inner ring connected to the front output shaft (38); It further includes a low-medium gear synchronizer sleeve (25), a medium gear driving gear (26), a low gear driving gear (29), a second needle bearing (30), a low-medium gear synchronizer base (31), a high gear driven gear (33), a high gear synchronizer sleeve (34), a third needle bearing (35), a high gear synchronizer base (36), a medium gear driven gear (42), and a low gear driven gear (43); The low-medium gear synchronizer base (31) is fixedly sleeved on the third shaft of the high gear driving gear and the input shaft assembly (27). The low gear driving gear (29) is sleeved on the low-medium gear synchronizer base (31) through the second needle bearing (30) and meshes with the low gear driven gear (43). The medium gear driving gear (26) is sleeved on the low-medium gear synchronizer base (31) through the second needle bearing (30) and meshes with the medium gear driven gear (42); The high gear driving gear of the high gear driving gear and the input shaft assembly (27) meshes with the high gear driven gear (33); The high gear synchronizer base (36) is fixedly sleeved on the front output shaft (38). The high gear driven gear (33) is sleeved on the high gear synchronizer base (36) through the third needle bearing (35). The high gear synchronizer sleeve (34) is slidably sleeved on the high gear synchronizer base (36) and is connected to the high gear synchronizer shift fork (40). The low-medium gear synchronizer sleeve (25) is slidably sleeved on the low-medium gear synchronizer base (31) and is located between the medium gear driving gear (26) and the low gear driving gear (29). The low-medium gear synchronizer sleeve (25) is connected to the low-medium gear synchronizer shift fork (24); The front output shaft (38) is fixedly connected to the power output unit output shaft (44); The left-end support bearing (39) and the right-end support bearing (47) of the output shaft are jointly used to support the front output shaft (38).

7. The power output unit assembly according to claim 6, wherein: The front output shaft (38) and the power output unit output shaft (44) are fixedly connected by bolts (46) and an output shaft pressing plate (45); One end of the front output shaft (38) far from the power output unit output shaft (44) is provided with a nut (37) for limiting and fixing the left-end support bearing (39) of the output shaft.

8. The power output unit assembly according to claim 1, characterized in that: X = 4.

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