CN217355416U - Tractor gearbox with four clutches - Google Patents

Abstract

The utility model discloses a tractor gearbox with four clutches, which comprises a wet-type multi-plate clutch reversing device, a main speed change device, an auxiliary speed change device, a transfer case device and a power output device, wherein a first shaft, a second shaft and a retrograde idler shaft are arranged in the wet-type multi-plate clutch reversing device; a three shaft, a four shaft and a power output front section shaft are arranged in the main speed changing device; five shafts and six shafts are arranged in the auxiliary transmission device, and the six shafts of the auxiliary transmission device are connected with a rear axle of the tractor; a transfer case idler shaft and a transfer case output shaft are arranged in the transfer case device; and a power output rear section shaft, a power output driving shaft and a power output shaft are arranged in the power output device. The tractor gearbox with the four clutches is strong in comprehensive function, simple and compact in structure, reasonable in structure, convenient to use and high in transmission efficiency, four-wheel drive and power output are controlled by wet-type multi-plate clutches in an electrohydraulic mode, operation is light, and unmanned driving can be achieved conveniently.

Description

Tractor gearbox with four clutches

Technical Field

The utility model relates to the technical field of agricultural machinery, specifically be a tractor gearbox with four clutches.

Background

The gearbox of traditional tractor generally adopts mechanical gear shifting modes such as sliding gear, meshing sleeve, and the tractor need separate the main clutch earlier when shifting gears, cuts off engine power, then shifts to the fender position that needs again, and the shift speed is slow, influences the operating efficiency. With the rapid development of the tractor industry, the upgrading and updating of the tractor technical level also make great progress, wherein the adoption of the wet-type multi-plate clutch for gear shifting is the development direction of domestic tractors.

The gear shifting and reversing of the gearbox are controlled by a hydraulic control system of the tractor and the wet-type multi-plate clutch, so that the gear shifting and reversing operation of the gearbox under the condition of uninterrupted power is realized. Compared with the traditional mechanical gear shifting, the wet-type multi-plate clutch gear shifting technology can realize uninterrupted power in the gear shifting process, simplify the operation process, reduce the operation difficulty and labor intensity, and improve the operation quality of the tractor, thereby realizing the improvement of the operation efficiency of the tractor. Therefore, it is necessary to develop a transmission for a tractor transmission provided with four clutches.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a compact structure, multiple functional, high, the low in manufacturing cost of transmission efficiency, have the gearbox transmission of wet-type multiplate clutch shift, switching-over, power take off's switching, the switching of front drive axle is provided, promptly: the tractor gearbox transmission device is provided with four clutches.

In order to achieve the above purpose, the utility model provides a following technical scheme: a tractor gearbox with four clutches comprises a wet-type multi-plate clutch reversing device, a main speed changing device, an auxiliary speed changing device, a transfer case device and a power output device, wherein a first shaft, a second shaft and a reverse idle wheel shaft are installed in the wet-type multi-plate clutch reversing device, one shaft of the wet-type multi-plate clutch reversing device is connected with a tractor engine, and the reverse idle wheel shaft is sleeved with a reverse idle wheel; a three-shaft, a four-shaft and a power output front-section shaft are arranged in the main speed changing device; five shafts and six shafts are installed in the auxiliary transmission device, and the six shafts of the auxiliary transmission device are connected with a rear axle of the tractor; the transfer case device is internally provided with a transfer case idler shaft and a transfer case output shaft, and the transfer case output shaft of the transfer case device is connected with a tractor front drive axle; the power output device is internally provided with a power output rear section shaft, a power output driving shaft and a power output shaft;

the reverse-running front-stage driving gear and the reverse-running rear-stage driven gear are sleeved on one shaft, and a common shell of the R-gear clutch and the F-gear clutch is fixedly connected to the other shaft;

a reverse preceding-stage driven gear and a reverse rear-stage driving gear are sequentially arranged on the two shafts in the direction from the tractor engine to the tractor rear axle, and the reverse preceding-stage driven gear and the reverse rear-stage driving gear are fixedly connected to the two shafts;

the three shafts are fixedly connected with the reverse rear-stage driven gear, a first-gear driving gear, a second-gear driving gear, a third-fourth-gear synchronizer and a fourth-gear driving gear are sequentially arranged on the three shafts, the first-gear driving gear, the second-gear driving gear and the third-fourth-gear synchronizer are fixedly connected on the three shafts, and the third-gear driving gear and the fourth-gear driving gear are sleeved on the three shafts;

the four-shaft is sequentially provided with a first-gear driven gear, a first-second-gear synchronizer, a second-gear driven gear, a third-gear driven gear and a fourth-gear driven gear from a tractor engine to a tractor rear axle, the first-gear driven gear and the second-gear driven gear are sleeved on the four-shaft, the first-second-gear synchronizer, the third-gear driven gear and the fourth-gear driven gear are fixedly connected on the four-shaft, and the output end of the four-shaft is fixedly connected with an auxiliary speed change input driving gear; the input end of the power output front-section shaft is fixedly connected with one shaft and penetrates through a central hole of the three shafts;

the output end of the five shafts is fixedly connected with the auxiliary variable speed input driven gear, a low-gear driving gear, a middle-gear meshing sleeve and a middle-gear driving gear are sequentially arranged on the five shafts, the low-gear driving gear and the middle-gear meshing sleeve are fixedly connected onto the five shafts, the middle-gear driving gear is sleeved on the five shafts, and the power output front-section shaft penetrates through a central hole of the five shafts;

a first high-low gear meshing sleeve, a low gear driven gear and a middle gear driven gear are sequentially arranged on the six shafts from the tractor engine to the rear axle of the tractor, and the output ends of the six shafts are connected with the rear axle of the tractor;

the transfer case idler shaft is sleeved with a transfer case idler, the transfer case output shaft is sleeved with a transfer case driven gear, the transfer case driven gear is fixedly connected with the transfer case clutch driving hub, and the transfer case clutch driven hub is fixedly connected with the transfer case output shaft;

the output end of the power output rear-section shaft is fixedly connected with the power output front-section shaft, penetrates through a central hole of the hollow power output driving shaft, and is fixedly connected with a driving hub of the power output clutch;

the input end of the power output driving shaft is fixedly connected with the driven hub of the power output clutch, and a power output high-gear driving gear and a power output low-gear driving gear are fixedly connected to the power output driving shaft in sequence from the rear axle of the tractor to the engine direction of the tractor;

the power output shaft is sequentially provided with a power output low-gear driven gear, a second high-low gear meshing sleeve and a power output high-gear driven gear from a tractor engine to a tractor rear axle, the second high-low gear meshing sleeve is fixedly connected with the power output shaft, and the power output low-gear driven gear and the power output high-gear driven gear are sleeved with the power output shaft.

Preferably, the axes of the first shaft, the third shaft, the fifth shaft and the power output driving shaft are on the same straight line and are sequentially arranged in the direction from the tractor engine to the rear axle of the tractor, the axes of the second shaft, the fourth shaft and the sixth shaft are on the same straight line and are sequentially arranged in the direction from the tractor engine to the rear axle of the tractor, corresponding gears on the first shaft and the second shaft are meshed, and the second shaft is positioned under the first shaft; the three shafts are meshed with corresponding gears on the four shafts, and the four shafts are positioned right below the three shafts; the five shafts are meshed with corresponding gears on the six shafts, and the six shafts are positioned right below the five shafts.

Preferably, the reverse front-stage driving gear on the one shaft is normally meshed with the reverse idler on the reverse idler shaft, and the reverse idler on the reverse idler shaft is normally meshed with the reverse front-stage driven gear on the two shafts; the axes of the first shaft, the second shaft, the third shaft, the fourth shaft, the fifth shaft, the sixth shaft, the power output driving shaft and the power output shaft are all distributed in the bilateral symmetry plane of the tractor gearbox.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the two wet-type multi-plate clutches are arranged in the reversing device, so that when the tractor runs in a reversing way, the tractor can reverse without cutting off the power of an engine, the reversing speed is high, and the operation efficiency is improved;

2. the wet multi-plate clutch is arranged in the transfer case device, so that the two-wheel drive of the tractor is changed into four-wheel drive more conveniently;

3. the wet-type multi-plate clutch is arranged in the power output device, so that power is output, the structure is reasonable, the use is convenient, and the transmission efficiency is high.

Drawings

Fig. 1 is a schematic view of the connection structure of each component of the present invention.

In the figure: 1. a first gear driving gear; 2. a first-gear driven gear; 3. a second gear driving gear; 4. a second driven gear; 5. a third gear drive gear; 6. a third-gear driven gear; 7. a fourth-gear driven gear; 8. a fourth-gear driven gear; 9. an auxiliary speed change input drive gear; 10. a sub-transmission input driven gear; 11. a low range drive gear; 12. a low-gear driven gear; 13. a middle gear driving gear; 14. a middle-gear driven gear; 15. a transfer case idler; 16. a transfer case driven gear; 17. a backward stage driven gear; 18. a reverse rear driving gear; 19. a retrograde forward drive gear; 20. a reverse idler gear; 21. a reverse preceding stage driven gear; 22. a power take-off low range drive gear; 23. a power output low-gear driven gear; 24. a power output high gear driving gear; 25. a power output high-gear driven gear; A. a tractor engine; B. a tractor front drive axle; C. a tractor rear axle; k1, wet multiplate clutch reversing device; k2, a main gear device; k3, subtransmission; k4, transfer case device; k5, power take-off; s1, a shaft; s2, two-axis; s3, three shafts; s4, four-axis; s5, five shafts; s6, six shafts; s7, a power output driving shaft; s8, a power output shaft; s9, transfer case idler shaft; s10, a transfer case output shaft; s11, reversing idler shaft; an L1, R-range clutch; l2, F clutch; l3, power take-off clutch; l4, transfer case clutch; n1, a middle gear engaging sleeve; n2, first high-low gear sleeve; n3, second high-low gear sleeve; t1, three-four gear synchronizer; t2, one-two synchronizer.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

Referring to fig. 1, the present invention provides a technical solution: a tractor gearbox with four clutches comprises a wet multi-plate clutch reversing device K1, a main speed change device K2, an auxiliary speed change device K3, a transfer case device K4 and a power output device K5, wherein a shaft S1, a shaft S2 and a reverse idle wheel shaft S11 are installed in the wet multi-plate clutch reversing device K1, the shaft S1 of the wet multi-plate clutch reversing device K1 is connected with a tractor engine A, and a reverse idle wheel 20 is sleeved on the reverse idle wheel shaft S11; a main speed changing device K2 is internally provided with a three-shaft S3, a four-shaft S4 and a power output front-stage shaft S12; a five shaft S5 and a six shaft S6 are arranged in the auxiliary transmission K3, and the six shaft S6 of the auxiliary transmission K3 is connected with a rear axle C of the tractor; a transfer case idler shaft S9 and a transfer case output shaft S10 are arranged in the transfer case device K4, and the transfer case output shaft S10 of the transfer case device K4 is connected with a front drive axle B of the tractor; the power output device K5 is internally provided with a power output rear-stage shaft S13, a power output driving shaft S7 and a power output shaft S8; a reverse-running forward-stage driving gear 19, an R-stage clutch L1, an F-stage clutch L2 and a reverse-running rear-stage driven gear 17 are sequentially arranged on a shaft S1, the reverse-running forward-stage driving gear 19 and the reverse-running rear-stage driven gear 17 are sleeved on the shaft, and a common shell of the R-stage clutch L1 and the F-stage clutch L2 is fixedly connected to a shaft S1; a reverse front driven gear 21 and a reverse rear driving gear 18 are sequentially arranged on the two shafts S2 from the tractor engine A to the tractor rear axle C, and the reverse front driven gear 21 and the reverse rear driving gear 18 are fixedly connected to the two shafts S2; the three shaft S3 is fixedly connected with the driven gear 17 at the backward stage, a first-gear driving gear 1, a second-gear driving gear 3, a third-gear driving gear 5, a three-four-gear synchronizer T1 and a fourth-gear driving gear 7 are sequentially arranged on the three shaft S3, the first-gear driving gear 1, the second-gear driving gear 3 and the three-four-gear synchronizer T1 are fixedly connected on the three shaft S3, and the third-gear driving gear 5 and the fourth-gear driving gear 7 are sleeved on the three shaft S3; a first-gear driven gear 2, a first-second-gear synchronizer T2, a second-gear driven gear 4, a third-gear driven gear 6 and a fourth-gear driven gear 8 are sequentially arranged on the four shaft S4 from a tractor engine A to a tractor rear axle C, the first-gear driven gear 2 and the second-gear driven gear 4 are sleeved on the four shaft S4, the first-second-gear synchronizer T2, the third-gear driven gear 6 and the fourth-gear driven gear 8 are fixedly connected on the four shaft S4, and an output end of the four shaft S4 is fixedly connected with an auxiliary speed change input driving gear 9; the input end of the power output front-stage shaft S12 is fixedly connected with a shaft S1 and penetrates through the central hole of the shaft S3; the output end of a five shaft S5 is fixedly connected with an auxiliary speed change input driven gear 10, a low-gear driving gear 11, a middle-gear meshing sleeve N1 and a middle-gear driving gear 13 are sequentially arranged on the five shaft S5, the low-gear driving gear 11 and the middle-gear meshing sleeve N1 are fixedly connected to the five shaft S5, the middle-gear driving gear 13 is sleeved on the five shaft S5, and a power output front-stage shaft S12 penetrates through a central hole of the five shaft S5; a first high-low gear meshing sleeve N2, a low gear driven gear 12 and a middle gear driven gear 14 are sequentially arranged on the six shaft S6 from a tractor engine A to a tractor rear axle C, and the output end of the six shaft S6 is connected with the tractor rear axle C; the transfer case idler gear 15 is sleeved on the transfer case idler shaft S9, the transfer case driven gear 16 is sleeved on the transfer case output shaft S10, the transfer case driven gear 16 is fixedly connected with the transfer case clutch L4 driving hub, and the transfer case clutch L4 driven hub is fixedly connected with the transfer case output shaft S10; the output end of the power output rear-stage shaft S13 is fixedly connected with the power output front-stage shaft S12, passes through the central hole of a hollow power output driving shaft S7, and is fixedly connected with a driving hub of a power output clutch L3; the input end of the power output driving shaft S7 is fixedly connected with the driven hub of the power output clutch L3, and the power output driving shaft S7 is fixedly connected with a power output high-gear driving gear 24 and a power output low-gear driving gear 22 in sequence from the rear axle C of the tractor to the engine A of the tractor; the power output shaft S8 is sequentially provided with a power output low-gear driven gear 23, a second high-low gear meshing sleeve N3 and a power output high-gear driven gear 25 from a tractor engine A to a tractor rear axle C, the second high-low gear meshing sleeve N3 is fixedly connected with the power output shaft S8, and the power output low-gear driven gear 23 and the power output high-gear driven gear 25 are sleeved with the power output shaft S8.

The axes of a shaft S1, a shaft S3, a shaft S5 and a power output driving shaft S7 are on the same straight line and are sequentially arranged from a tractor engine A to a tractor rear axle C, the axes of a shaft S2, a shaft S4 and a shaft S6 are on the same straight line and are sequentially arranged from the tractor engine A to the tractor rear axle C, corresponding gears on the shaft S1 and the shaft S2 are meshed, and a shaft S2 is positioned under the shaft S1; the three shaft S3 is meshed with the corresponding gear on the four shaft S4, and the four shaft S4 is positioned right below the three shaft S3; five shafts S5 mesh with corresponding gears on six shafts S6, and six shafts S6 are located right below five shafts S5. The reverse preceding-stage driving gear 19 on the first shaft S1 is normally meshed with the reverse idler gear 20 on the reverse idler shaft S11, and the reverse idler gear 20 on the reverse idler shaft S11 is normally meshed with the reverse preceding-stage driven gear 21 on the second shaft S2; the axes of the first shaft S1, the second shaft S2, the third shaft S3, the fourth shaft S4, the fifth shaft S5, the sixth shaft S6, the power output driving shaft S7 and the power output shaft S8 are all distributed in the left-right symmetrical plane of the tractor gearbox.

The power of a tractor engine A is transmitted into a wet multi-plate clutch reversing device K1, the power is divided into two paths, the power for the tractor to walk is transmitted into a wet multi-plate clutch reversing device K1 from the tractor engine A, and then is transmitted to a rear axle C through a main speed change device K2 and an auxiliary speed change device K3; meanwhile, the auxiliary transmission device K3 transmits power to the transfer case device K4 and then to the front drive axle B;

the power of the power output shaft is transmitted into a wet multi-plate clutch reversing device K1 by a tractor engine A, is input into a power output front-stage shaft S12 through a shaft S1, is transmitted to a power output rear-stage shaft S13 and is transmitted to a power output shaft S8 at the rear part of the tractor.

First gear: the reverse rear stage driven gear 17 is coupled to the F-range clutch L2 on the shaft S1, the first-second synchronizer T2 on the four shaft S4 is coupled to the first stage driven gear 2, and the first high-low range engaging sleeve N2 on the six shaft S6 is coupled to the low stage driven gear 12, so that the tractor engine a power is composed of a shaft S1 → the first stage drive gear 1 → the stage driven gear 2 → the range input drive gear 9 → the range input driven gear 10 → the low stage drive gear 11 → the low stage driven gear 12 → the six shaft S6 → the rear axle C;

and (2) second: the F-range clutch L2 on the first shaft S1 is coupled to the reverse rear driven gear 17, the first-second synchronizer T2 on the fourth shaft S4 is coupled to the second driven gear 4, the first high-low range engaging sleeve N2 on the sixth shaft S6 is coupled to the low driven gear 12, and the tractor engine a power is transmitted from the first shaft S1 → the second drive gear 3 → the second driven gear 4 → the subtransmission input drive gear 9 → the subtransmission input driven gear 10 → the low drive gear 11 → the low driven gear 12 → the sixth shaft S6 → the rear axle C;

and (3) third gear: the F-range clutch L2 on the first shaft S1 is coupled to the reverse rear driven gear 17, the three-four range synchronizer T1 on the third shaft S3 is coupled to the third driven gear 5, the first high-low range engaging sleeve N2 on the sixth shaft S6 is coupled to the low driven gear 12, and the tractor engine a power is composed of the first shaft S1 → the third drive gear 5 → the third driven gear 6 → the range input drive gear 9 → the range input driven gear 10 → the low drive gear 11 → the low driven gear 12 → the sixth shaft S6 → the rear axle C;

fourth gear: the F-range clutch L2 on the first shaft S1 is coupled to the reverse rear driven gear 17, the three-four range synchronizer T1 on the third shaft S3 is coupled to the four range driven gear 7, the first high-low range engaging sleeve N2 on the sixth shaft S6 is coupled to the low range driven gear 12, and the tractor engine a power is composed of the first shaft S1 → the four range driving gear 7 → the four range driven gear 8 → the range input driving gear 9 → the range input driven gear 10 → the low range driving gear 11 → the low range driven gear 12 → the sixth shaft S6 → the rear axle C;

the power transmission route of the fifth to eighth gears is substantially the same as that of the first to fourth gears, except that in the subtransmission device K3, power passes through the middle drive gear 13 → the middle driven gear 14; such as: fifthly, gear shifting: the F-speed clutch L2 on the shaft S1 is coupled to the reverse rear driven gear 17, the first-second speed synchronizer T2 on the shaft S3 is coupled to the first-speed driven gear 2, the middle-speed meshing sleeve N1 on the shaft S5 is coupled to the middle-speed drive gear 13, and the tractor engine a power is composed of a shaft S1 → a first-speed drive gear 1 → a first-speed driven gear 2 → the range-change input drive gear 9 → the range-change input driven gear 10 → a middle-speed drive gear 13 → a middle-speed driven gear 14 → a six shaft S6 → a rear axle C;

the sixth gear, the seventh gear and the eighth gear are not described again.

The power transmission route from the ninth gear to the twelfth gear is basically the same as that from the first gear to the fourth gear, except that in the subtransmission device K3, the first high-low gear sleeve N2 is coupled with the subtransmission input drive gear 9, and power passes through the subtransmission input drive gear 9 → the six shaft S6; such as: nine gears: the F-speed clutch L2 on the first shaft S1 is coupled to the reverse rear driven gear 17, the first-second speed synchronizer T2 on the third shaft S3 is coupled to the first-speed driven gear 2, the first high-low speed meshing sleeve N2 on the sixth shaft S6 is coupled to the subtransmission input drive gear 9, and the tractor engine a power is composed of a first shaft S1 → the first-speed drive gear 1 → the first-speed driven gear 2 → the subtransmission input drive gear 9 → the sixth shaft S6 → the rear axle C;

the tenth, eleventh and twelfth gears will not be described.

The arrangement mode has the advantages of strong comprehensive function, simple and compact structure, reasonable structure, convenient use and high transmission efficiency, four-wheel drive and power output are controlled by a wet multi-plate clutch electrohydraulic, the operation is light, unmanned driving can be conveniently realized, 12 forward gears and 12 reverse gears can be realized in the whole gearbox, the forward gear speed covers 2.37-33.16km/h, the reverse gear speed covers 2.15-29.99km/h, and the speed requirements of various domestic operations on the tractor are met.

Those not described in detail in this specification are within the skill of the art.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims (3)

1. A tractor gearbox with four clutches is characterized by comprising a wet type multi-plate clutch reversing device (K1), a main speed change device (K2), an auxiliary speed change device (K3), a transfer case device (K4) and a power output device (K5), wherein a shaft (S1), a shaft (S2) and a reverse idle wheel shaft (S11) are installed in the wet type multi-plate clutch reversing device (K1), the shaft (S1) of the wet type multi-plate clutch reversing device (K1) is connected with an engine (A), and the reverse idle wheel shaft (S11) is sleeved with a tractor reverse idle wheel (20); a three shaft (S3), a four shaft (S4) and a power output front-stage shaft (S12) are arranged in the main speed changing device (K2); a five shaft (S5) and a six shaft (S6) are arranged in the auxiliary transmission device (K3), and the six shaft (S6) of the auxiliary transmission device (K3) is connected with a rear axle (C) of the tractor; a transfer case idler shaft (S9) and a transfer case output shaft (S10) are arranged in the transfer case device (K4), and the transfer case output shaft (S10) of the transfer case device (K4) is connected with a front drive axle (B) of the tractor; the power output device (K5) is internally provided with a power output rear-stage shaft (S13), a power output driving shaft (S7) and a power output shaft (S8);

the reverse-motion front-stage driving gear (19), the R-stage clutch (L1), the F-stage clutch (L2) and the reverse-motion rear-stage driven gear (17) are sequentially arranged on the first shaft (S1), the reverse-motion front-stage driving gear (19) and the reverse-motion rear-stage driven gear (17) are sleeved on the first shaft, and a common shell of the R-stage clutch (L1) and the F-stage clutch (L2) is fixedly connected to the first shaft (S1);

the two shafts (S2) are sequentially provided with a reverse front driven gear (21) and a reverse rear driving gear (18) in the direction from the tractor engine (A) to the tractor rear axle (C), and the reverse front driven gear (21) and the reverse rear driving gear (18) are fixedly connected to the two shafts (S2);

the three-shaft (S3) is fixedly connected with the reverse rear-stage driven gear (17), a first-gear driving gear (1), a second-gear driving gear (3), a third-gear driving gear (5), a third-fourth-gear synchronizer (T1) and a fourth-gear driving gear (7) are sequentially arranged on the three-shaft (S3), the first-gear driving gear (1), the second-gear driving gear (3) and the third-fourth-gear synchronizer (T1) are fixedly connected onto the three-shaft (S3), and the third-gear driving gear (5) and the fourth-gear driving gear (7) are sleeved on the three-shaft (S3);

a first-gear driven gear (2), a first-second-gear synchronizer (T2), a second-gear driven gear (4), a third-gear driven gear (6) and a fourth-gear driven gear (8) are sequentially arranged on the four shaft (S4) from a tractor engine (A) to a tractor rear axle (C), the first-gear driven gear (2) and the second-gear driven gear (4) are sleeved on the four shaft (S4), the first-second-gear synchronizer (T2), the third-gear driven gear (6) and the fourth-gear driven gear (8) are fixedly connected to the four shaft (S4), and an output end of the four shaft (S4) is fixedly connected with an auxiliary speed change input driving gear (9); the input end of the power output front-stage shaft (S12) is fixedly connected with one shaft (S1) and penetrates through the central holes of the three shafts (S3);

the output end of the five shaft (S5) is fixedly connected with the auxiliary transmission input driven gear (10), a low-gear driving gear (11), a middle-gear meshing sleeve (N1) and a middle-gear driving gear (13) are sequentially arranged on the five shaft (S5), the low-gear driving gear (11) and the middle-gear meshing sleeve (N1) are fixedly connected onto the five shaft (S5), the middle-gear driving gear (13) is sleeved on the five shaft (S5), and the power output front-section shaft (S12) penetrates through a central hole of the five shaft (S5);

a first high-low gear meshing sleeve (N2), a low gear driven gear (12) and a middle gear driven gear (14) are sequentially arranged on the six shafts (S6) from a tractor engine (A) to a tractor rear axle (C), and the output ends of the six shafts (S6) are connected with the tractor rear axle (C);

a transfer case idler gear (15) is sleeved on the transfer case idler shaft (S9), a transfer case driven gear (16) is sleeved on the transfer case output shaft (S10), the transfer case driven gear (16) is fixedly connected with a transfer case clutch (L4) driving hub, and the transfer case clutch (L4) driven hub is fixedly connected with the transfer case output shaft (S10);

the output end of the power output rear-stage shaft (S13) is fixedly connected with the power output front-stage shaft (S12), passes through a central hole of a hollow power output driving shaft (S7), and is fixedly connected with a driving hub of a power output clutch (L3);

the input end of the power output driving shaft (S7) is fixedly connected with the driven hub of the power output clutch (L3), and the power output driving shaft (S7) is fixedly connected with a power output high-gear driving gear (24) and a power output low-gear driving gear (22) in sequence from a tractor rear axle (C) to a tractor engine (A);

the power output shaft (S8) is sequentially provided with a power output low-gear driven gear (23), a second high-low gear meshing sleeve (N3) and a power output high-gear driven gear (25) from a tractor engine (A) to a tractor rear axle (C), the second high-low gear meshing sleeve (N3) is fixedly connected with the power output shaft (S8), and the power output low-gear driven gear (23) and the power output high-gear driven gear (25) are sleeved with the power output shaft (S8).

2. The tractor transmission with four clutches of claim 1, characterized in that the axes of the first shaft (S1), the third shaft (S3), the fifth shaft (S5) and the power output main shaft (S7) are on the same straight line and are arranged in sequence from the tractor engine (a) to the tractor rear axle (C), the axes of the second shaft (S2), the fourth shaft (S4) and the sixth shaft (S6) are on the same straight line and are arranged in sequence from the tractor engine (a) to the tractor rear axle (C), the corresponding gears on the first shaft (S1) and the second shaft (S2) are meshed, and the second shaft (S2) is located under the first shaft (S1); the three shaft (S3) is meshed with the corresponding gear on the four shaft (S4), and the four shaft (S4) is positioned right below the three shaft (S3); the five shafts (S5) and the six shafts (S6) are meshed with corresponding gears, and the six shafts (S6) are positioned right below the five shafts (S5).

3. The four-clutch transmission of claim 1, wherein the reverse drive pinion (19) on one shaft (S1) is in constant mesh with the reverse idler (20) on the reverse idler shaft (S11), and the reverse idler (20) on the reverse idler shaft (S11) is in constant mesh with the reverse driven pinion (21) on the secondary shaft (S2); the axes of a first shaft (S1), a second shaft (S2), a third shaft (S3), a fourth shaft (S4), a fifth shaft (S5), a sixth shaft (S6), a power output driving shaft (S7) and a power output shaft (S8) are all distributed in the bilateral symmetry plane of the tractor gearbox.

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