Nine-gear power shift transmission

Abstract

The application discloses a nine-gear power shift transmission device, wherein a clutch driving gear and an engine are connected with a clutch input shaft; a first clutch unit and a third clutch unit are both sleeved on the clutch input shaft; the clutch driving gear is connected with input ends of the first clutch unit, the third clutch unit and a second clutch unit respectively; output ends of the first clutch unit, the third clutch unit and the second clutch unit are sequentially connected; the output end of the third clutch unit is sequentially connected with input ends of a forward clutch and a reverse clutch through a clutch output gear; the forward clutch and the reverse clutch are both arranged on a transmission main shaft; the clutch output gear is connected with an input end of a reverse gear unit; and an output end of the reverse gear unit is connected with an output end of the reverse clutch. The device has a wider power shift speed ratio interval, the whole vehicle can realize a wider power shift speed adjusting interval, the shift is smoother, and the problem of shift interruption in the prior art is solved.

Description

Technical Field

[0001] This invention belongs to the field of power transmission technology and relates to a nine-speed power shift transmission device. Background Technology

[0002] Agricultural equipment operates under complex conditions, and its transmission assemblies typically consist of a main and auxiliary gearbox connected in series, with multiple gears and large speed ratio differences. Tractor transmission systems mainly employ several types of shifting mechanisms: sleeve shifting, synchronizer shifting, and power shifting. Sleeve shifting involves the driver operating a shift lever, which moves the transmission fork to engage the sleeve with the gear. This process is cumbersome, requiring a series of actions such as depressing the clutch, shifting, depressing the clutch again, and engaging the gear. Driving performance remains unimproved, and power interruption occurs during shifting. Synchronizer shifting uses a synchronizer to synchronize the speeds of the gears before engaging them. With synchronizer shifting, disengaging the clutch allows for direct engagement, simplifying the shifting process to some extent, but power interruption still occurs during shifting.

[0003] Power shifting uses an electro-hydraulic control system to operate the clutch or brake, engaging and disengaging to achieve gear changes or reversals without interrupting power. Power shifting is divided into partial power shifting and full power shifting. Partial power shifting connects a manual shift transmission and a power shift transmission in series, enabling power shifting of some gears. Full power shifting enables power shifting of all gears. Regardless of whether it's partial or full power shifting, the core functional unit is the power shift transmission device. Currently, tractor power shift transmissions on the market are generally four-speed or six-speed. Four-speed or six-speed transmissions have lower adaptability to various operating conditions. Furthermore, when the transmission assembly has more gears, load interruptions often occur due to gear shifting, resulting in low shifting efficiency. Summary of the Invention

[0004] The purpose of this invention is to solve the problems of gear shift interruption, low shift efficiency due to operating conditions, and cumbersome shifting in the prior art. It provides a nine-speed power shift transmission device that enables vehicle starting, nine-speed power shifting, and power reversal. This device can be used as a core functional unit in tractor power shift transmission assemblies, allowing the transmission assembly to achieve power shifting under different operating conditions or at a wider range of speeds, while optimizing engine power utilization as much as possible.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] A nine-speed power shift transmission device includes a clutch drive gear, a clutch output gear, an engine, a first clutch unit, a second clutch unit, a third clutch unit, a forward clutch, a reverse clutch, a reverse gear unit, a clutch input shaft, and a transmission main shaft.

[0007] Both the clutch drive gear and the engine are connected to the clutch input shaft; the first clutch unit and the third clutch unit are loosely fitted on the clutch input shaft.

[0008] The clutch drive gear is connected to the input ends of the first clutch unit, the third clutch unit, and the second clutch unit respectively; the output ends of the first clutch unit, the third clutch unit, and the second clutch unit are connected in sequence; the external gear of the first clutch unit is connected in sequence to the external gears of the second clutch unit and the third clutch unit; the output end of the third clutch unit is connected in sequence to the input ends of the forward clutch and the reverse clutch through the clutch output gear, and both the forward clutch and the reverse clutch are mounted on the transmission main shaft.

[0009] The clutch output gear is connected to the input end of the reverse gear unit, and the output end of the reverse gear unit is connected to the input end of the reverse clutch.

[0010] A further improvement of the present invention is that:

[0011] The reverse gear unit includes a reverse gear intermediate shaft gear, a reverse gear intermediate shaft, and a reverse gear drive gear;

[0012] The reverse gear intermediate shaft gear meshes with the clutch output gear, the reverse gear intermediate shaft gear is fixedly connected to the input end of the reverse gear intermediate shaft, the output end of the reverse gear intermediate shaft is fixedly connected to the reverse drive gear, and the reverse drive gear is connected to the input end of the reverse clutch.

[0013] The forward clutch and the reverse clutch share a common outer hub, which is fixedly connected to the transmission main shaft. The clutch output gear is connected to the inner hub of the forward clutch, and the inner hub of the reverse clutch is connected to the reverse transmission gear. The reverse transmission gear is connected to the reverse drive gear through the reverse idler gear.

[0014] The reverse gear is loosely fitted on the transmission shaft.

[0015] The reverse idler gear is positioned between the reverse transmission gear and the reverse drive gear.

[0016] The first clutch unit includes a first clutch, a second clutch, and a first intermediate shaft;

[0017] The input end of the first clutch meshes with the clutch drive gear. The first clutch and the second clutch are connected by a common outer hub. The first clutch and the second clutch are sequentially mounted on the first intermediate shaft. The outer hubs of the first clutch and the second clutch are provided with the first clutch external gear. The first clutch external gear meshes with the outer sides of the second clutch unit and the third clutch unit in sequence.

[0018] The input end of the first clutch is fixedly connected to the first intermediate shaft, and the output end of the second clutch is provided with a C2 clutch gear, which is connected to the C2 clutch transmission gear.

[0019] The C2 clutch gear and the first clutch external gear are both loosely fitted on the outside of the first intermediate shaft, and the clutch transmission gear is loosely fitted on the clutch input shaft.

[0020] The input end of the first clutch is provided with a C1 clutch gear, which is fixedly connected to the first intermediate shaft and the inner hub of the first clutch respectively, and the C1 clutch gear meshes with the clutch drive gear.

[0021] The second clutch unit includes a fifth clutch, a sixth clutch, and a second intermediate shaft;

[0022] The fifth clutch and the sixth clutch are sequentially mounted on the second intermediate shaft of the clutch. The fifth clutch and the sixth clutch are connected by a common outer hub. A second clutch external gear is provided on the outside of the outer hub. The second clutch external gear meshes with the first clutch external gear and the external gear of the third clutch unit, respectively.

[0023] The input end of the fifth clutch is provided with a C5 clutch gear, which is fixedly connected to the second intermediate shaft of the clutch and connected to the input end of the third clutch unit; the output end of the sixth clutch is connected to a C6 clutch gear, which is loosely fitted on the second intermediate shaft of the clutch and connected to the output end of the third clutch unit.

[0024] The second clutch unit includes a third clutch, a fourth clutch, and a clutch output shaft;

[0025] The third and fourth clutches are sequentially mounted on the clutch output shaft and connected by a common outer hub. The common outer hub is provided with an external gear for the third clutch, which meshes with the external gear for the second clutch. The input end of the third clutch is provided with a C3 clutch gear, which is loosely fitted on the clutch output shaft and meshes with the clutch drive gear and the C5 clutch gear.

[0026] The output end of the fourth clutch is provided with a C4 clutch gear, which is fixedly connected to the clutch output shaft. The C4 clutch gear meshes with the C4 clutch drive gear, which is loosely fitted on the clutch input shaft. The C4 clutch drive gear is fixedly connected to the C2 clutch drive gear. The clutch output gear is fixedly connected to the clutch output shaft.

[0027] The C6 clutch gear meshes with the C4 clutch gear.

[0028] The C5 clutch gear is fixedly connected to the inner hub of the fifth clutch; the C6 clutch gear is connected to the inner hub of the sixth clutch.

[0029] The C3 clutch gear is fixedly connected to the inner hub of the third clutch;

[0030] The C4 clutch gear is fixedly connected to the inner hub of the fourth clutch.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] This invention discloses a nine-speed power shift transmission device. This device utilizes multiple clutch units in synergistic connection with a forward clutch and a reverse clutch. The power output of the first and third clutch units is achieved through the input ends of the third clutch unit and the forward and reverse clutches. Through different operating states and conditions, gear shifting and power reversal can be quickly completed. Compared to existing four-speed or six-speed transmissions, this device has a wider power shift ratio range, allowing the vehicle to achieve a wider power shift speed range. It also reduces the number of gears in the auxiliary transmission, simplifies the auxiliary transmission's structural design, makes the transmission assembly more compact, has closer speed ratio differentials, and provides smoother shifting. It also improves clutch lifespan, shifting comfort, and fuel economy. This device can adapt to a wider range of operating conditions and vehicle speeds.

[0033] Furthermore, in the three clutch units disclosed in this invention, each clutch unit includes two clutches and one drive shaft. Through the cooperation of six clutches and four drive shafts, different transmission routes composed of clutches can be selected according to different gear requirements and the cooperation of the four drive shafts. This allows for more clutch gear selection, enabling a wider power shift speed range, more flexible gear selection, and stronger adaptability to various working conditions. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a transmission route diagram of the present invention;

[0036] Wherein, 1-clutch drive gear; 2-C2 clutch transmission gear; 3-C4 clutch transmission gear; 4-C1 clutch gear; 5-first clutch external gear; 6-C2 clutch gear; 7-C5 clutch gear; 8-second clutch external gear; 9-C6 clutch gear; 10-C3 clutch gear; 11-third clutch external gear; 12-C4 clutch gear; 13-clutch output gear; 14-reverse gear intermediate shaft gear; 15-reverse gear drive gear; 16-reverse gear idler gear; 17-reverse gear transmission gear;

[0037] S1 - Clutch input shaft; S2 - Clutch first intermediate shaft; S3 - Clutch second intermediate shaft; S4 - Clutch output shaft; S5 - Reverse intermediate shaft; S6 - Drive main shaft; C1 - First clutch; C2 - Second clutch; C3 - Third clutch; C4 - Fourth clutch; C5 - Fifth clutch; C6 - Sixth clutch; CF - Forward clutch; CR - Reverse clutch; 18 - Engine. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0040] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0041] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0042] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply 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.

[0043] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0044] The present invention will now be described in further detail with reference to the accompanying drawings:

[0045] See Figure 1 This invention discloses a nine-speed power shift transmission device. The transmission device can realize nine-speed power shifting and power reversal, and can be used as a core functional unit in the power shift transmission assembly of a tractor. The transmission assembly can realize power shifting under different working conditions or within a wider range of travel speeds, and can optimize the utilization of engine power as much as possible.

[0046] Combination Figure 1 Further explanation of the specific technical solution of the present invention: the clutch drive gear 1 and the engine 18 are fixedly connected to the clutch input shaft S1, the C2 clutch transmission gear 2 and the C4 clutch transmission gear 3 are loosely fitted on the clutch input shaft S1, and the C2 clutch transmission gear 2 and the C4 clutch transmission gear 3 are fixedly connected.

[0047] Clutch gear 4 of C1 is fixedly connected to the first intermediate shaft S2 of the clutch and the inner hub of the first clutch C1. Clutch gear 6 of C2 is fixedly connected to the inner hub of the second clutch C2. The first clutch C1 and the second clutch C2 share an outer hub. The outer gear 5 of the first clutch (the shared outer gear of the first clutch C1 and the second clutch C2) is fixedly connected to the shared outer hub of the first clutch C1 and the second clutch C2. The shared outer hub of the first clutch C1 and the second clutch C2 and clutch gear 6 are loosely fitted on the first intermediate shaft S2 of the clutch.

[0048] Clutch gear 7 of C5 is fixedly connected to the second intermediate shaft S3 of the clutch and the inner hub of the fifth clutch C5. Clutch gear 9 of C6 is fixedly connected to the inner hub of the sixth clutch C6. The fifth clutch C5 and the sixth clutch C6 share an outer hub. The outer gear 8 of the second clutch (the shared outer gear of the fifth clutch C5 and the sixth clutch C6) is fixedly connected to the shared outer hub of the fifth clutch C5 and the sixth clutch C6. The shared outer hub of the fifth clutch C5 and the sixth clutch C6 and clutch gear 9 of C6 are loosely fitted on the second intermediate shaft S3 of the clutch.

[0049] Clutch gear 10 of C3 is fixedly connected to the inner hub of the third clutch C3. The third clutch C3 and the fourth clutch C4 share an outer hub. The outer gear 11 of the third clutch (the shared outer gear of the third clutch C3 and the fourth clutch C4) is fixedly connected to the shared outer hub of the third clutch C3 and the fourth clutch C4. Clutch gear 12 of C4 is fixedly connected to the inner hub of the clutch output shaft S4 and the fourth clutch C4. Clutch output gear 13 is fixedly connected to the inner hub of the clutch output shaft S4 and the forward clutch CF. The shared outer hub of the third clutch C3 and the fourth clutch C4 and clutch gear 10 of C3 are loosely fitted on the clutch output shaft S4.

[0050] The reverse gear intermediate shaft gear 14 and the reverse gear drive gear 15 are fixedly connected to the reverse gear intermediate shaft S5;

[0051] The forward clutch CF and the reverse clutch CR share a common outer hub, which is fixedly connected to the transmission main shaft S6. The reverse gear 17 is fixedly connected to the inner hub of the reverse clutch CR, and the reverse gear 17 is loosely fitted on the transmission main shaft S6.

[0052] The reverse idler gear 16 is positioned between the reverse drive gear 15 and the reverse transmission gear 17.

[0053] Engine 18 provides power to the entire power shift transmission. Clutch gear 4 (C1), clutch drive gear 1, clutch gear 10 (C3), and clutch gear 7 (C5) are constantly meshed. External clutch gear 5 (first), external clutch gear 8 (second), and external clutch gear 11 (third) are constantly meshed. Clutch gear 6 (C2) and clutch transmission gear 2 (C2) are constantly meshed. Clutch transmission gear 3 (C4), clutch gear 12 (C4), and clutch gear 9 (C6) are constantly meshed. Clutch output gear 13 and reverse intermediate shaft gear 14 are constantly meshed. Reverse drive gear 15, reverse idler gear 16, and reverse transmission gear 17 are constantly meshed.

[0054] This invention discloses nine gear transmission routes: the transmission device utilizes the coordinated operation of shift clutches C1 / C2 / C3 / C4 / C5 / C6 and main clutches CF / CR to realize vehicle starting, nine-gear power shifting and power reversal. See Table 1 for the shifting timing table of this invention.

[0055]

[0056] 1st gear

[0057] The first clutch C1 and the second clutch C2 are engaged, and the power of the engine 18 is transmitted from the clutch input shaft S1 → clutch drive gear 1 → C1 clutch gear 4 → C2 clutch gear 6 → C2 clutch transmission gear 2 → C4 clutch transmission gear 3 → C4 clutch gear 12 → clutch output shaft S4 → clutch output gear 13.

[0058] 2nd gear

[0059] The first clutch C1 and the fourth clutch C4 are engaged, and the power of the engine 18 is transmitted from the clutch input shaft S1 → clutch drive gear 1 → C1 clutch gear 4 → C1 / C2 clutch external gear 5 (first clutch external gear 5) → C5 / C6 clutch external gear 8 (second clutch external gear 8) → C3 / C4 clutch external gear 11 (third clutch external gear 11) → C4 clutch gear 12 → clutch output shaft S4 → clutch output gear 13;

[0060] 3rd gear

[0061] The first clutch C1 engages with the sixth clutch C6, and the power of the engine 18 is transmitted from the clutch input shaft S1 → clutch drive gear 1 → C1 clutch gear 4 → C1 / C2 clutch external gear 5 (first clutch external gear 5) → C5 / C6 clutch external gear 8 (second clutch external gear 8) → C6 clutch transmission gear 9 → C4 clutch gear 12 → clutch output shaft S4 → clutch output gear 13.

[0062] 4th gear

[0063] The third clutch C3 engages with the second clutch C2, and the power of the engine 18 is transmitted from the clutch input shaft S1 → clutch drive gear 1 → C3 clutch gear 10 → C3 / C4 clutch external gear 11 (third clutch external gear 11) → C5 / C6 clutch external gear 8 (second clutch external gear 8) → C1 / C2 clutch external gear 5 (first clutch external gear 5) → C2 clutch gear 6 → C2 clutch transmission gear 2 → C4 clutch transmission gear 3 → C4 clutch gear 12 → clutch output shaft S4 → clutch output gear 13.

[0064] 5th gear

[0065] The third clutch C3 and the fourth clutch C4 are engaged, and the power of the engine 18 is transmitted from the clutch input shaft S1 → clutch drive gear 1 → C3 clutch gear 10 → C4 clutch gear 12 → clutch output shaft S4 → clutch output gear 13.

[0066] 6th gear

[0067] The third clutch C3 and the sixth clutch C6 are engaged, and the power of the engine 18 is transmitted from the clutch input shaft S1 → clutch drive gear 1 → C3 clutch gear 10 → C3 / C4 clutch external gear 11 (third clutch external gear 11) → C5 / C6 clutch external gear 8 (second clutch external gear 8) → C6 clutch gear 9 → C4 clutch gear 12 → clutch output shaft S4 → clutch output gear 13.

[0068] 7th gear

[0069] The fifth clutch C5 engages with the second clutch C2, and the power of the engine 18 is transmitted from the clutch input shaft S1 → clutch drive gear 1 → C3 clutch gear 10 → C5 clutch gear 7 → C5 / C6 clutch external gear 8 (second clutch external gear 8) → C1 / C2 clutch external gear 5 (first clutch external gear 5) → C2 clutch gear 6 → C2 clutch transmission gear 2 → C4 clutch transmission gear 3 → C4 clutch gear 12 → clutch output shaft S4 → clutch output gear 13.

[0070] 8th gear

[0071] When the fifth clutch C5 engages with the fourth clutch C4, the power of the engine 18 is transmitted from the clutch input shaft S1 to the clutch drive gear 1, the C3 clutch gear 10, the C5 clutch gear 7, the C5 / C6 clutch external gear 8 (second clutch external gear 8), the C3 / C4 clutch external gear 11 (third clutch external gear 11), the C4 clutch gear 12, the clutch output shaft S4, and the clutch output gear 13.

[0072] 9th gear

[0073] When the fifth clutch C5 and the sixth clutch C6 are engaged, the power of the engine 18 is transmitted from the clutch input shaft S1 to the clutch drive gear 1, the C3 clutch gear 10, the C5 clutch gear 7, the C6 clutch gear 9, the C4 clutch gear 12, the clutch output shaft S4, and the clutch output gear 13.

[0074] Forward gear: The forward clutch CF is engaged, and power is transmitted from the clutch output gear 13 to the transmission main shaft S6;

[0075] Reverse gear: The reverse clutch CR is engaged, and the power is transmitted from the clutch output gear 13 → reverse intermediate shaft gear 14 → reverse intermediate shaft S5 → reverse drive gear 15 → reverse idler gear 16 → reverse transmission gear 17 → transmission main shaft S6.

[0076] This invention discloses a gear shifting operation process:

[0077] When starting the vehicle, first select the appropriate gear (1st to 9th gear) according to the actual working conditions, and then engage the main clutch CF or CR according to the direction of travel.

[0078] When the transmission shifts up (taking shifting from first to second gear as an example), the driving direction remains unchanged and the first clutch C1 is engaged. At the same time, the second clutch C2 is disengaged and the fourth clutch C4 is engaged. After the second clutch C2 is fully disengaged and the fourth clutch C4 is locked, the entire shifting process is completed, and the power is continuous and uninterrupted.

[0079] When the transmission downshifts (taking fourth gear downshifting to third gear as an example), the driving direction remains unchanged, while disengaging the third clutch C3 and the second clutch C2 and engaging the first clutch C1 and the sixth clutch C6. After the third clutch C3 and the second clutch C2 are completely disengaged and the first clutch C1 and the sixth clutch C6 are locked, the entire downshifting process is completed, and the power is continuous and uninterrupted.

[0080] When the vehicle reaches a certain speed, the power reversal is completed by switching the working states of the forward clutch CF and the reverse clutch CR.

[0081] Compared to four-speed / six-speed power shift, nine-speed power shift has a wider power shift ratio range, allowing the vehicle to achieve a wider power shift speed range. It also reduces the number of gears in the auxiliary transmission, simplifies the structural design of the auxiliary transmission, and makes the transmission assembly more compact. It has a closer speed ratio differential, which can improve the service life of the clutch, enhance shifting comfort, and improve fuel economy.

[0082] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A nine-speed power shift transmission device, characterized in that, It includes a clutch drive gear (1), a clutch output gear (13), an engine (18), a first clutch unit, a second clutch unit, a third clutch unit, a forward clutch (CF), a reverse clutch (CR), a reverse gear unit, a clutch input shaft (S1), and a drive main shaft (S6). The clutch drive gear (1) and the engine (18) are both connected to the clutch input shaft (S1); the first clutch unit and the third clutch unit are both loosely fitted on the clutch input shaft (S1); The clutch drive gear (1) is connected to the input ends of the first clutch unit, the third clutch unit, and the second clutch unit respectively; the output ends of the first clutch unit, the third clutch unit, and the second clutch unit are connected in sequence; the external gear of the first clutch unit is connected in sequence to the external gears of the second clutch unit and the third clutch unit; the output end of the third clutch unit is connected in sequence to the input ends of the forward clutch (CF) and the reverse clutch (CR) through the clutch output gear (13), and both the forward clutch (CF) and the reverse clutch (CR) are mounted on the transmission main shaft (S6); The clutch output gear (13) is connected to the input end of the reverse gear unit, and the output end of the reverse gear unit is connected to the input end of the reverse clutch (CR); The first clutch unit includes a first clutch (C1), a second clutch (C2), and a first intermediate shaft (S2). The input end of the first clutch (C1) meshes with the clutch drive gear (1). The first clutch (C1) and the second clutch (C2) are connected by a common outer hub. The first clutch (C1) and the second clutch (C2) are sequentially mounted on the first intermediate shaft (S2). The outer hubs of the first clutch (C1) and the second clutch (C2) are provided with a first clutch external gear (5). The first clutch external gear (5) meshes with the outer surfaces of the second clutch unit and the third clutch unit in sequence. The input end of the first clutch (C1) is fixedly connected to the first intermediate shaft (S2), and the output end of the second clutch (C2) is provided with a C2 clutch gear (6), which is connected to the C2 clutch transmission gear (2). The C2 clutch gear (6) and the first clutch external gear (5) are both loosely fitted on the outside of the first intermediate shaft (S2), and the C2 clutch transmission gear (2) is loosely fitted on the clutch input shaft (S1). The second clutch unit includes a fifth clutch (C5), a sixth clutch (C6), and a second intermediate shaft (S3); The fifth clutch (C5) and the sixth clutch (C6) are sequentially mounted on the second intermediate shaft (S3) of the clutch. The fifth clutch (C5) and the sixth clutch (C6) are connected by a common outer hub. A second clutch external gear (8) is provided on the outside of the outer hub. The second clutch external gear (8) meshes with the first clutch external gear (5) and the external gear of the third clutch unit, respectively. The input end of the fifth clutch (C5) is provided with a C5 clutch gear (7), which is fixedly connected to the second intermediate shaft of the clutch (S3) and connected to the input end of the third clutch unit; the output end of the sixth clutch (C6) is connected to a C6 clutch gear (9), which is loosely fitted on the second intermediate shaft of the clutch (S3) and connected to the output end of the third clutch unit; The third clutch unit includes a third clutch (C3), a fourth clutch (C4), and a clutch output shaft (S4). The third clutch (C3) and the fourth clutch (C4) are sequentially mounted on the clutch output shaft (S4). The third clutch (C3) and the fourth clutch (C4) are connected by a common outer hub. The common outer hub is provided with a third clutch external gear (11), which meshes with the second clutch external gear (8). The input end of the third clutch (C3) is provided with a C3 clutch gear (10), which is loosely fitted on the clutch output shaft (S4). The C3 clutch gear (10) meshes with the clutch drive gear (1) and the C5 clutch gear (7) respectively. The output end of the fourth clutch (C4) is provided with a C4 clutch gear (12), which is fixedly connected to the clutch output shaft (S4). The C4 clutch gear (12) meshes with the C4 clutch transmission gear (3). The C4 clutch transmission gear (3) is loosely fitted on the clutch input shaft (S1) and is fixedly connected to the C2 clutch transmission gear (2). The clutch output gear (13) is fixedly connected to the clutch output shaft (S4). The C6 clutch gear (9) meshes with the C4 clutch gear (12); The forward clutch (CF) and the reverse clutch (CR) share a common outer hub, which is fixedly connected to the transmission main shaft (S6). The clutch output gear (13) is connected to the inner hub of the forward clutch (CF), and the inner hub of the reverse clutch (CR) is connected to the reverse transmission gear (17). The reverse transmission gear (17) is connected to the reverse drive gear (15) through the reverse idler gear (16).

2. The nine-speed power shift transmission device according to claim 1, characterized in that, The reverse gear unit includes a reverse gear intermediate shaft gear (14), a reverse gear intermediate shaft (S5), and a reverse gear drive gear (15). The reverse gear intermediate shaft gear (14) meshes with the clutch output gear (13), the reverse gear intermediate shaft gear (14) is fixedly connected to the input end of the reverse gear intermediate shaft (S5), the output end of the reverse gear intermediate shaft (S5) is fixedly connected to the reverse drive gear (15), and the reverse drive gear (15) is connected to the input end of the reverse clutch (CR).

3. The nine-speed power shift transmission device according to claim 1, characterized in that, The reverse gear (17) is loosely fitted on the transmission main shaft (S6).

4. A nine-speed power shift transmission device according to claim 1, characterized in that, The reverse idler gear (16) is positioned between the reverse transmission gear (17) and the reverse drive gear (15).

5. A nine-speed power shift transmission device according to claim 1, characterized in that, The input end of the first clutch (C1) is provided with a C1 clutch gear (4), which is fixedly connected to the inner hub of the first intermediate shaft (S2) and the first clutch (C1) respectively, and the C1 clutch gear (4) meshes with the clutch drive gear (1).

6. A nine-speed power shift transmission device according to claim 1, characterized in that, The C5 clutch gear (7) is fixedly connected to the inner hub of the fifth clutch (C5); the C6 clutch gear (9) is connected to the inner hub of the sixth clutch (C6); The C3 clutch gear (10) is fixedly connected to the inner hub of the third clutch (C3); The C4 clutch gear (12) is fixedly connected to the inner hub of the fourth clutch (C4).

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