Direct-connected transmission assembly

Abstract

The present invention relates to the technical field of gearboxes, in particular to a direct-connected gearbox assembly, which includes a power input end. A transmission mechanism is connected to the power input end. On one side below the transmission mechanism, there is a reverse shaft assembly. On one side of the reverse shaft assembly, there are respectively a reverse shaft fork assembly and a high / low speed fork shaft assembly. And below the reverse shaft assembly, there is a high / low speed gear fork assembly. On one side of the high / low speed gear fork assembly, there is a high / low speed gear assembly. Below the high / low speed gear assembly, there is a steering assembly. In terms of the overall appearance of the present invention compared with the prior application, it is more beautiful and the overall volume is smaller. Compared with the original box body, the processing is simpler. At the same time, there is only one driven bevel gear on one side of the driving bevel gear. Compared with the original design, the stability is better. In this device, the brake clutch is arranged below the gear position. Compared with the original design, the effectiveness of the brake can be ensured regardless of the position of the gear position.

Description

Technical Field

[0001] The present invention relates to the technical field of gearboxes, specifically to a direct-connected gearbox assembly. Background Art

[0002] A gearbox is a device for changing the speed ratio and direction of motion, which is used in automobiles, tractors, ships, machine tools and various machines to change the torque, speed and direction of motion transmitted from the driving shaft to the driven shaft according to different working conditions. A gearbox with gear transmission generally consists of a housing and several pairs of gears. Gearboxes are widely used in agriculture. With the development and maturity of China's machinery industry, more and more mechanical equipment for specific occasions has been developed and used. Currently, domestic gearboxes generally use belt pulleys for transmission. Belt transmission has low efficiency, high energy consumption and is not environmentally friendly. Moreover, it produces a lot of noise during use, which is likely to cause noise pollution, with low efficiency and backward performance. The applicant's previous invention application "202211125479.X" uses a direct-connected connection, which has higher efficiency than belt pulley transmission, avoiding the problems of easy wear and slippage of the belt during belt transmission. The overall performance is more stable, and it produces less noise during use, effectively avoiding noise pollution, with excellent overall performance. The gearbox is generally in a "7" shape and can adapt to the use in narrow spaces. However, there is one passive bevel gear on each side of the original housing transmission mechanism, and bearings are used inside, resulting in poor overall stability. In the braking part, the original housing and the clutch are placed on the same shaft. If the gear is in the neutral position, a brake failure will occur.

[0003] Therefore, a direct-connected gearbox assembly is needed to improve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a direct-connected gearbox assembly to solve the problems in the above background art, that is, there is one passive bevel gear on each side of the original housing transmission mechanism, bearings are used inside, resulting in poor overall stability. In the braking part, the original housing and the clutch are placed on the same shaft. If the gear is in the neutral position, a brake failure will occur.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A direct-connected gearbox assembly comprises a power input end, which is connected to a transmission mechanism, a reverse and forward shaft assembly is arranged on one side below the transmission mechanism, a reverse and forward shaft fork assembly and a fast and slow gear fork shaft assembly are arranged on one side of the reverse and forward shaft assembly, and a high and low speed gear fork assembly is arranged below the reverse and forward shaft assembly, a high and low speed gear assembly is arranged on one side of the high and low speed gear fork assembly, a steering assembly is arranged below the high and low speed gear assembly, a power transmission wheel assembly and a driving wheel shaft assembly are arranged in sequence below the steering assembly, the transmission mechanism comprises a fast and slow gear driving gear shaft, and a passive gear is fixedly connected to one end of the fast and slow gear driving gear shaft. Bevel gear, one side of the passive bevel gear is meshed with active bevel gear, the active bevel gear is connected to the power input end, one side of the passive bevel gear is provided with a fast and slow gear active gear set, the fast and slow gear active gear set is connected to the fast and slow gear fork shaft assembly, the clutch output end drives the active bevel gear to rotate, and then drives the passive bevel gear to rotate, and then drives the fast and slow gear active gear set to rotate, the fast and slow gear active gear set is meshed with the fast and slow gear passive gear set to realize transmission, the setting of the reverse shaft assembly controls the forward or backward movement, the setting of the single-sided passive bevel gear is more stable than the double-sided passive bevel gear setting, and with the spline setting, the overall stability is more stable.

[0007] As a preferred solution of the present invention, the power input end includes an input shaft gear, which is meshed with the clutch gear at one end of the clutch, a clutch release claw is provided on one side of the clutch, the clutch output shaft is fixedly connected to the middle part of the active bevel gear, the upper end of the clutch gear is meshed with an upper gear, and the middle shaft of the upper gear is connected to the output end of the hydraulic pump, the input shaft gear is connected to the power source, and then drives the clutch and the transmission mechanism to rotate.

[0008] As a preferred solution of the present invention, the inner hole of the passive bevel gear is provided with a spline.

[0009] As a preferred solution of the present invention, the reverse forward shaft assembly includes a fast and slow gear shaft, the outer side surfaces of the fast and slow gear shafts are provided with sliding grooves at equal intervals, and shift gears and fast and slow gear passive gear groups are slidably arranged on both sides of the fast and slow gear shafts, and the high and low speed gear fork assembly includes a high and low speed gear fork shaft, and a forward gear and a reverse gear are arranged on the outside of one end of the high and low speed gear fork shaft, and the shift gear is meshed with the forward gear, and the shift gear is driven to move by the reverse forward shaft fork assembly to change the position of the shift gear.

[0010] As a preferred embodiment of the present invention, the high-low speed gear assembly includes a high-low speed driving gear shaft and a high-low speed driven gear shaft. A transmission gear is arranged on the outer side of one end of the high-low speed driving gear shaft, and a high-low speed driving gear set is arranged on one side of the transmission gear. A high-low speed driven gear is connected to the outer side of one end of the high-low speed driven gear shaft. The high-low speed driven gear meshes with the transmission gear, and a brake clutch is arranged at the other end of the high-low speed driven gear shaft. A brake separating claw is arranged on one side of the brake clutch. A high-low speed shift fork is arranged on the outer side of the high-low speed shift fork shaft, and the shift fork shaft on one side of the high-low speed shift fork is docked with the high-low speed driving gear set. The high-low speed driving gear set is driven to rotate by the transmission gear, and then the high-low speed driven gear is driven to rotate. The transmission is braked by the cooperation of the brake clutch and the brake separating claw.

[0011] As a preferred embodiment of the present invention, the fast-slow shift fork shaft assembly includes a fast-slow shift fork shaft. An arc-shaped groove is formed on the surface of one side of the fast-slow shift fork shaft. A sliding block is arranged in the arc-shaped groove, and a shaft cylinder is connected to one end of the sliding block. A fork rod docked with the fast-slow driven gear set is fixedly connected to the outer side of one side of the shaft cylinder. The shaft cylinder is driven to move on the fast-slow shift fork shaft by a hydraulic component, and then the fork rod and the fast-slow driven gear are driven to move, so as to realize fast-slow shift adjustment.

[0012] As a preferred embodiment of the present invention, the steering assembly includes a steering shaft. Meshing gears meshing with the high-low speed driven gear are arranged on both sides of the middle of the steering shaft, and steering shaft gears are arranged on both sides of the meshing gears. Steering brake seats are arranged at both ends of the steering shaft. Shaft cylinders are arranged between the connections of the two steering brake seats and the steering shaft. A rotating crank is connected to the outer side of each shaft cylinder. One ends of the two rotating cranks are both connected with docking ends, and the docking ends are docked with a hydraulic steering component. A plurality of docking grooves are formed on both sides of the meshing gears. Docking blocks are arranged on the adjacent sides of the two steering shaft gears and the meshing gear. The docking blocks are docked with the docking grooves in a matching manner. The hydraulic steering component drives the rotating crank to rotate, and then the docking or separation of the docking blocks on the meshing gear and the docking grooves on both sides of the steering shaft gear is realized, so as to realize unilateral or bilateral disengagement, and thus realize steering.

[0013] As a preferred embodiment of the present invention, docking parts are connected to one ends of the fast-slow shift fork shaft assembly, the forward-reverse shaft shift fork assembly and the high-low speed gear assembly. The docking parts are all connected with hydraulic components. The docking part includes a docking column, and a plurality of grooves are formed on the outer surface of the docking column. A docking block is connected to the outside of the docking column in a clamped and matched manner, and the docking block is connected to the output end of the hydraulic component. The shaft cylinder is driven to move on the fast-slow shift fork shaft by the hydraulic component, and then the fork rod and the fast-slow driven gear are driven to move, so as to realize fast-slow shift adjustment.

[0014] As a preferred embodiment of the present invention, the power transmission wheel set includes a transmission gear shaft, and on both sides of the middle of the transmission gear shaft, there is a first power transmission gear meshing with the steering shaft gear. On the outer side of each of the two first power transmission gears on both sides, there is a second power transmission gear. The drive wheel shaft assembly includes an output shaft. On both sides of the middle of the output shaft, there is a drive shaft gear meshing with the second power transmission gear, and at both ends of the output shaft, there are drive wheels connected. The first power transmission gear drives the second power transmission gear to rotate by meshing with the steering shaft gear, thereby driving the output shaft and the drive wheels to rotate.

[0015] As a preferred embodiment of the present invention, the overall structures of the power input end, the transmission mechanism, the forward and reverse shaft assembly, the high and low speed shift fork shaft assembly, the forward and reverse shaft fork assembly, and the high and low speed shift fork assembly are vertically arranged with respect to the overall structures of the high and low speed shift assembly, the steering assembly, the power transmission wheel set, and the drive wheel shaft assembly. The power input end, the transmission mechanism, the forward and reverse shaft assembly, the high and low speed shift fork shaft assembly, the forward and reverse shaft fork assembly, the high and low speed shift fork assembly, the high and low speed shift assembly, the steering assembly, the power transmission wheel set, and the drive wheel shaft assembly are externally provided with an upper housing and a lower housing. On one side of the upper housing, there is a box body plate, and the lower housing is vertically arranged with respect to the upper housing. The overall appearance of the upper housing and the lower housing is more beautiful, and the overall volume is smaller, which is convenient for processing.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] The overall appearance of the present invention is more beautiful and the overall volume is smaller compared with the prior application. It is simpler to process than the original box body. At the same time, there is only one driven bevel gear on one side of the driving bevel gear, which has better stability compared with the original design. In this device, the brake clutch is arranged below the gear position. Compared with the original design, the effectiveness of the brake can be ensured regardless of the gear position. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 is a first perspective three-dimensional view of the internal structure of the present invention;

[0020] Figure 3 is the front view of the internal structure of the present invention;

[0021] Figure 4 is the side view of the internal structure of the present invention;

[0022] Figure 5 is a second perspective three-dimensional view of the internal structure of the present invention;

[0023] Figure 6 is a third perspective three-dimensional view of the internal structure of the present invention;

[0024] Figure 7 This is the fourth perspective three-dimensional view of the internal structure of the present invention;

[0025] Figure 8 This is the fifth perspective three-dimensional view of the internal structure of the present invention.

[0026] In the figure: upper housing 1, lower housing 2, box body plate 3, hydraulic pump 4, output shaft 5, drive wheel 6, brake clutch 7, brake separating claw 8, drive shaft gear 9, transmission gear shaft 10, power transmission gear two 11, power transmission gear one 12, meshing gear 13, high and low speed driven gear one 14, rotating crank 15, connecting shaft 16, fast and slow shift fork shaft 17, high and low speed shift fork 18, forward and reverse shift fork 19, shift gear 20, passive bevel gear 21, active bevel gear 22, fast and slow shift shaft 23, upper gear 24, clutch gear 25, input shaft gear 26, high and low speed driven gear two 27, transmission gear 28, forward gear 29, reverse gear 30, fast and slow shift active gear one 31, fast and slow shift active gear two 32, high and low speed shift fork shaft 33, forward and reverse shift fork shaft 34, fast and slow shift driven gear one 35, fast and slow shift driven gear one 36, fast and slow shift driven gear shaft 37, fast and slow shift active gear shaft 38, steering shaft gear 39, high and low speed gear shaft 40, clutch 41, clutch separating claw 42, docking end 43. Detailed implementation manners

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0028] For the convenience of understanding the present invention, the present invention will be described more comprehensively below with reference to the relevant content. Several embodiments of the present invention are given. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0029] It should be noted that when an element is referred to as being "fixedly provided on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0031] See also Figure 1-8 , the present invention provides a technical solution:

[0032] For example, please refer to Figure 1-8 , including a power input end, the power input end is connected with a transmission mechanism, a reverse and forward shaft assembly is arranged on one side below the transmission mechanism, a reverse and forward shaft fork assembly and a fast and slow gear fork shaft assembly are arranged on one side of the reverse and forward shaft assembly, and a high and low speed gear fork assembly is arranged below the reverse and forward shaft assembly, a high and low speed gear assembly is arranged on one side of the high and low speed gear fork assembly, a steering assembly is arranged below the high and low speed gear assembly, and a power transmission wheel assembly and a driving wheel shaft assembly are arranged in sequence below the steering assembly, characterized in that: the transmission mechanism includes a fast and slow gear driving gear shaft 38, one end of the outer side of the fast and slow gear driving gear shaft 38 is fixedly connected with a passive bevel gear 21, and one side of the passive bevel gear 21 is meshed with an active bevel gear 22, the active bevel gear 22 is connected to the power input end, and a fast and slow gear active gear set is arranged on one side of the passive bevel gear 21, and the fast and slow gear active gear set is connected to the fast and slow gear fork shaft assembly, and a spline is arranged in the inner hole of the passive bevel gear 21. The output end of the clutch 41 drives the active bevel gear 22 to rotate, thereby driving the passive bevel gear 21 to rotate, thereby driving the rotation of the fast and slow gear active gear set, and the fast and slow gear active gear set is meshed with the fast and slow gear passive gear set to realize transmission. The setting of the reverse shaft assembly controls the forward or backward movement. The setting of the single-sided passive bevel gear 21 is more stable than that of the double-sided passive bevel gear 21, and the overall stability is more stable with the setting of the spline.

[0033] Please refer to Figure 4 , 5 And 6, the power input end includes an input shaft gear 26, the input shaft gear 26 is meshed with the clutch gear 25 at one end of the clutch 41, a clutch release claw 42 is provided on one side of the clutch 41, the output shaft of the clutch 41 is fixedly connected to the middle part 22 of the active bevel gear, the upper end of the clutch gear 25 is meshed with the upper gear 24, and the middle shaft of the upper gear 24 is connected to the output end of the hydraulic pump 4, the input shaft gear 26 is connected to the power source, and then drives the clutch 41 and the transmission mechanism to rotate.

[0034] Please refer to Figure 3 , 4, the forward and reverse shaft assembly includes a high and low speed shaft 23. The outer side of the high and low speed shaft 23 is provided with sliding grooves at equal intervals. A shifting gear 20 and a high and low speed driven gear set are respectively slidably arranged on both sides of the high and low speed shaft 23. The high and low speed shift fork assembly includes a high and low speed shift fork shaft 33. A forward gear 29 and a reverse gear 30 are arranged outside one end of the high and low speed shift fork shaft 33. The shifting gear 20 meshes with the forward gear 29. The movement of the shifting gear 20 is driven by the forward and reverse shaft shift fork assembly to change the position of the shifting gear 20.

[0035] Please refer to Figure 3 , 5 , the high and low speed assembly includes a high and low speed drive gear shaft and a high and low speed driven gear shaft. A transmission gear 28 is arranged outside one end of the high and low speed drive gear shaft. A high and low speed drive gear set is arranged on one side of the transmission gear 28. A high and low speed driven gear is connected to the outside of one end of the high and low speed driven gear shaft. The high and low speed driven gear meshes with the transmission gear 28. A brake clutch 7 is arranged at the other end of the high and low speed driven gear shaft. A brake release claw 8 is arranged on one side of the brake clutch 7. A high and low speed shift fork 18 is arranged outside the high and low speed shift fork shaft 33. One side of the shift fork shaft of the high and low speed shift fork 18 is docked with the high and low speed drive gear set. The high and low speed drive gear set is driven to rotate by the transmission gear 28, and then the high and low speed driven gear is driven to rotate. The transmission is braked by the cooperation of the brake clutch 7 and the brake release claw 8.

[0036] Please refer to Figure 3 , the high and low speed shift fork shaft assembly includes a high and low speed shift fork shaft 17. An arc-shaped groove is formed on one side surface of the high and low speed shift fork shaft 17. A sliding block is arranged in the arc-shaped groove. One end of the sliding block is connected to a shaft cylinder. A fork rod docked with the high and low speed driven gear set is fixedly connected to the outside of one side of the shaft cylinder. The shaft cylinder is driven to move on the high and low speed shift fork shaft 17 by a hydraulic component, and then the fork rod and the high and low speed driven gear are driven to move to achieve high and low speed adjustment.

[0037] Please refer to Figure 5 , 6、7, and 8, the steering assembly includes a steering shaft. On both sides of the middle of the steering shaft, there are meshing gears 13 meshing with the high and low speed driven gears, and on both sides of the meshing gears 13, there are steering shaft gears 39. At both ends of the steering shaft, there are steering brake seats. Between the connections of the two steering brake seats and the steering shaft, there are shaft cylinders. On the outer side of each shaft cylinder, there is a rotating crank 15 connected. One end of the two rotating cranks 15 on both sides is connected with a docking end 43, and the docking end 43 is docked with a hydraulic steering assembly. On both sides of the meshing gears 13, there are several docking grooves opened. On the adjacent sides of the two steering shaft gears 39 and the meshing gears 13, there are docking blocks, and the docking blocks are fitted and docked with the docking grooves. By driving the rotating crank 15 to rotate through the hydraulic steering assembly, the docking or separation of the docking blocks on the meshing gears 13 and the docking grooves on both sides of the steering shaft gears 39 is driven, realizing unilateral or bilateral disengagement, and thus realizing steering.

[0038] Please refer to Figure 7 and 8, at one end of the fast and slow shift fork shaft assembly, the forward and reverse shaft fork assembly, and the high and low speed gear assembly, there are docking parts connected. The docking parts are all connected with a hydraulic assembly. The docking part includes a docking column, and there are several grooves opened on the outer surface of the docking column. The docking column is externally fitted and clamped with a docking block, and the docking block is connected with the output end of the hydraulic assembly. By driving through the hydraulic assembly, the shaft cylinder moves on the fast and slow shift fork shaft 17, and then drives the shift fork rod and the fast and slow speed driven gear to move, realizing fast and slow speed adjustment.

[0039] Please refer to Figure 7 and 8, the power transmission wheel set includes a transmission gear shaft 10. On both sides of the middle of the transmission gear shaft 10, there is a first power transmission gear 12 meshing with the steering shaft gear 39. On the outer side of one side of the two first power transmission gears 12, there is a second power transmission gear 11. The drive wheel shaft assembly includes an output shaft 5. On both sides of the middle of the output shaft 5, there is a drive shaft gear 9 meshing with the second power transmission gear 11. At both ends of the output shaft 5, there are drive wheels 6 connected. The first power transmission gear 12 drives the second power transmission gear 11 to rotate by meshing with the steering shaft gear 39, realizing the rotation of the output shaft 5 and the drive wheels 6.

[0040] Please refer to Figure 1, the overall structures of the power input end, transmission mechanism, forward and reverse shaft assembly, high and low speed shift fork shaft assembly, forward and reverse shaft fork assembly, and high and low speed shift fork assembly are vertically arranged with respect to the overall structures of the high and low speed shift assembly, steering assembly, power transmission wheel set, and drive wheel shaft assembly. An upper housing 1 and a lower housing 2 are provided outside the power input end, transmission mechanism, forward and reverse shaft assembly, high and low speed shift fork shaft assembly, forward and reverse shaft fork assembly, high and low speed shift fork assembly, high and low speed shift assembly, steering assembly, power transmission wheel set, and drive wheel shaft assembly. A box body plate 3 is provided on one side of the upper housing 1. The lower housing 2 is vertically arranged with respect to the upper housing 1. The overall appearance of the upper housing 1 and the lower housing 2 is more beautiful, and the overall volume is smaller, facilitating the processing operation.

[0041] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Direct-connected transmission assembly, including a power input end, a transmission mechanism is connected to the power input end, a reverse shaft assembly is arranged on one side below the transmission mechanism, a reverse shaft fork assembly and a high-low speed shift fork shaft assembly are respectively arranged on one side of the reverse shaft assembly, and a high-low speed shift fork assembly is arranged below the reverse shaft assembly, a high-low speed gear assembly is arranged on one side of the high-low speed shift fork assembly, a steering assembly is arranged below the high-low speed gear assembly, and a power transmission wheel set and a drive wheel shaft assembly are sequentially arranged below the steering assembly, and it is characterized in that: The transmission mechanism comprises a fast and slow gear driving gear shaft (38), one end of the fast and slow gear driving gear shaft (38) is fixedly connected with a passive bevel gear (21), one side of the passive bevel gear (21) is meshed with an active bevel gear (22), the active bevel gear (22) is connected to the power input end, one side of the passive bevel gear (21) is provided with a fast and slow gear driving gear set, and the fast and slow gear driving gear set is connected to the fast and slow gear shift fork shaft assembly; The reverse and forward shaft assembly comprises a fast and slow gear shaft (23), the outer side surface of the fast and slow gear shaft (23) is provided with sliding grooves at equal intervals, and the two sides of the fast and slow gear shaft (23) are respectively slidably provided with a shift gear (20) and a fast and slow gear passive gear set, the high and low speed gear shift fork assembly comprises a high and low speed gear shift fork shaft (33), one end of the high and low speed gear shift fork shaft (33) is externally provided with a forward gear (29) and a reverse gear (30), and the shift gear (20) is meshed with the forward gear (29).

2. The direct-connected transmission assembly according to claim 1, wherein: The power input end comprises an input shaft gear (26), the input shaft gear (26) meshes with a clutch gear (25) at one end of a clutch (41), a clutch release claw (42) is provided on one side of the clutch (41), the clutch (41) output shaft is fixedly connected to the middle part (22) of the active bevel gear, the upper end of the clutch gear (25) meshes with an upper gear (24), and the middle shaft of the upper gear (24) is connected to the output end of the hydraulic pump (4).

3. The direct-connected transmission assembly according to claim 1, wherein: The inner hole of the passive bevel gear (21) is provided with a spline.

4. The direct-connected transmission assembly according to claim 1, characterized in that: The high and low speed gear assembly comprises a high and low speed driving gear shaft and a high and low speed driven gear shaft, a transmission gear (28) is arranged on the outside of one end of the high and low speed driving gear shaft, a high and low speed driving gear set is arranged on one side of the transmission gear (28), a high and low speed driven gear is connected to the outside of one end of the high and low speed driven gear shaft, the high and low speed driven gear is meshed with the transmission gear (28), a brake clutch (7) is arranged on the other end of the high and low speed driven gear shaft, and a brake separation claw (8) is arranged on one side of the brake clutch (7), a high and low speed gear shift fork (18) is arranged on the outside of the high and low speed gear shift fork shaft (33), and the shift fork shaft on one side of the high and low speed gear shift fork (18) is connected to the high and low speed gear driving gear set.

5. The direct-connected transmission assembly according to claim 1, wherein: The fast and slow gear shift fork shaft assembly comprises a fast and slow gear shift fork shaft (17), a surface of one side of the fast and slow gear shift fork shaft (17) is provided with an arc groove, a sliding block is arranged in the arc groove, one end of the sliding block is connected to a shaft cylinder, and an outer side of the shaft cylinder is fixedly connected to a shift fork rod that is connected to the fast and slow gear passive gear set.

6. The direct-connected transmission assembly according to claim 1, wherein: The steering assembly includes a steering shaft. On both sides of the middle of the steering shaft, there are meshing gears (13) meshing with the high and low speed driven gears, and on both sides of the meshing gears (13), there are steering shaft gears (39). At both ends of the steering shaft, there are steering brake seats. Between the connections of the two steering brake seats and the steering shaft, there are shaft cylinders. On the outer side of each shaft cylinder, there is a rotating crank (15) connected. At one end of the two rotating cranks (15) on both sides, there is a docking end (43), and the docking end (43) is docked with a hydraulic steering assembly. On both sides of the meshing gear (13), there are a number of docking grooves opened. On the adjacent sides of the two steering shaft gears (39) and the meshing gear (13), there are docking blocks, and the docking blocks are cooperatively docked with the docking grooves.

7. The direct-connected transmission assembly according to claim 1, wherein: One end of each of the fast and slow shift fork shaft assembly, the forward and reverse shaft fork assembly, and the high and low speed shift assembly is connected with a docking part. The docking parts are all connected with a hydraulic assembly. The docking part includes a docking column, and a number of grooves are opened on the outer surface of the docking column. The outside of the docking column is cooperatively clamped and connected with a docking block, and the docking block is connected with the output end of the hydraulic assembly.

8. The direct-connected transmission assembly according to claim 1, wherein: The power transmission wheel set includes a transmission gear shaft (10). On both sides of the middle of the transmission gear shaft (10), there is a first power transmission gear (12) meshing with the steering shaft gear (39). On the outer side of one side of the two first power transmission gears (12), there is a second power transmission gear (11). The drive wheel shaft assembly includes an output shaft (5). On both sides of the middle of the output shaft (5), there is a drive shaft gear (9) meshing with the second power transmission gear (11), and at both ends of the output shaft (5), there are drive wheels (6) connected.

9. The direct-connected transmission assembly according to any one of claims 1-8, characterized in that: The overall structures of the power input end, the transmission mechanism, the forward and reverse shaft assembly, the fast and slow shift fork shaft assembly, the forward and reverse shaft fork assembly, and the high and low speed shift fork assembly are vertically arranged with the overall structures of the high and low speed shift assembly, the steering assembly, the power transmission wheel set, and the drive wheel shaft assembly. The power input end, the transmission mechanism, the forward and reverse shaft assembly, the fast and slow shift fork shaft assembly, the forward and reverse shaft fork assembly, the high and low speed shift fork assembly, the high and low speed shift assembly, the steering assembly, the power transmission wheel set, and the drive wheel shaft assembly are externally provided with an upper housing (1) and a lower housing (2). On one side of the upper housing (1), there is a box body plate (3), and the lower housing (2) is vertically arranged with the upper housing (1).

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