Gearbox integrated top cover and speed change system

Abstract

The gearbox integrated top cover comprises a shell and a plurality of gear assemblies in one-to-one correspondence with different gears, each gear assembly comprises a shifting fork shaft and a gear shifting fork, the multiple shifting fork shafts are parallel at equal intervals and rotatably connected to the shell, and the gear shifting forks are connected with the shifting fork shafts in a one-to-one correspondence mode; the gear shifting mechanism comprises a gear shifting shaft, a gear shifting shifting block and a gear shifting V-shaped block, the gear shifting shaft is rotatably arranged in the shell in a penetrating mode, and the gear shifting shifting block and the gear shifting V-shaped block are arranged on the gear shifting shaft in a sleeving mode, can horizontally move relative to the gear shifting shaft and rotate along with the gear shifting shaft; the gear selecting mechanism comprises a gear selecting shaft, the gear selecting shaft is rotatably arranged on the shell, and one end of the gear selecting shaft is connected with the gear shifting block in a clamped mode; the gear selecting shaft is used for driving the gear shifting block to move horizontally along the gear shifting shaft and correspond to any gear shifting fork, the gear shifting shaft rotates so that the gear shifting block can be connected with the corresponding gear shifting fork in a clamped mode, during gear shifting, the stroke between the strokes of the adjacent gears is fixed, and the consistency of driving feelings is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of gearboxes, and in particular to a gearbox integrated top cover and a speed change system. Background Art

[0002] The manual transmission top cover currently generally adopts a split structure, that is, the shift fork and auxiliary box control valve are installed on other shells outside the top cover shell.

[0003] For example, patent application CN115451117A provides an integrated eight-speed gearbox, including an upper cover, the inner cavity of the upper cover is provided with a speed change mechanism; a hollow raised portion is provided on the upper cover, and the cavity of the raised portion is connected to the inner cavity of the upper cover; an operating device is provided on the raised portion; the operating device includes a shift operating shaft assembly, which is inserted into the cavity of the raised portion, and the portion of the shift operating shaft assembly inserted into the cavity is sequentially installed with a reverse gear balance spring, a reverse gear damping sleeve, a shift dial head, a valve control block and a forward gear balance spring.

[0004] However, the problem is that the gear shifting stroke is related to the gear selection stroke, which directly affects the gear shifting stroke of one of the left and right gears to be significantly larger than that of the other two gears; and the gear shifting stroke increases further with the increase of the gear selection, resulting in poor driving control consistency. Summary of the invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies and propose a gearbox integrated top cover and a gear shifting system to solve the technical problems in the prior art that the gear shifting stroke changes with the gear selection and the driving operation consistency is poor.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: The present invention provides a gearbox integrated top cover, comprising: case, A plurality of the gear assemblies corresponding to different gears, the gear assemblies comprising a fork shaft and a gear fork, the plurality of the fork shafts being equidistantly parallel and rotatably connected to the housing, the gear forks being connected to the fork shafts in a one-to-one correspondence; A shift mechanism, comprising a shift shaft, a shift knob, and a shift V-block, wherein the shift shaft is rotatably disposed in the housing, the shift knob and the shift V-block are sleeved on the shift shaft and can translate relative to the shift shaft and rotate with the shift shaft; and The gear selection mechanism includes a gear selection shaft, which is rotatably arranged on the shell and one end of which is engaged with the gear shift head; the gear selection shaft is used to drive the gear shift head to translate along the gear shift shaft and correspond to any of the gear shift forks, and the gear shift shaft rotates to engage the gear shift head with the corresponding gear shift fork.

[0007] In some embodiments, an in-gear limiting assembly is provided on the inner wall of the shell for abutting and limiting the shift shaft in the in-gear state.

[0008] In some embodiments, the gear limit assembly includes a limit bolt, a limit spring, and a limit contact. The limit bolt is fixed to the inner wall of the shell, one end of the limit spring is fixed to the limit bolt, and the other end is fixed to the limit contact. The limit contact abuts against the shift shaft, and a plurality of grooves are provided on the shift shaft. When the shift shaft is in the gear state, the limit contact is embedded in the groove.

[0009] In some embodiments, a self-locking component is provided on the inner wall of the shell, and the self-locking component includes a self-locking steel ball and a self-locking spring. Grooves are respectively provided on the fork shaft corresponding to the front gear, neutral gear, and rear gear position points. One end of the self-locking spring is fixed to the inner wall of the shell, and the other end is fixed to the self-locking steel ball.

[0010] In some embodiments, a pipe is provided on the inner wall of the shell and is sequentially connected to the position where the fork shaft is inserted. An interlocking component is provided in the pipe. The interlocking component includes an interlocking ball and an interlocking pin. The interlocking ball is arranged in the pipe, and the interlocking pin is fixed on the fork shaft and abuts against the interlocking ball.

[0011] In some embodiments, a thrust block and a gear selection balance spring are provided on one side of the gear shift head. The thrust block and the gear selection balance spring are sleeved on the gear shift shaft. One end of the gear selection balance spring abuts against the inner wall of the shell, and the other end is fixed to the thrust block. Under the action of the gear selection balance spring, the thrust block abuts against the gear shift head to limit the moving stroke of the gear shift head.

[0012] In some embodiments, an oil seal and a limit ring are provided on the shift select shaft, and the oil seal and the limit ring are sleeved on the shift select shaft and abut against the inner wall of the housing.

[0013] In some embodiments, a shift rocker arm is provided on one end of the shift shaft located outside the housing, and the shift rocker arm is fixed to the shift shaft via a spline.

[0014] In some embodiments, the gearbox integrated top cover also includes a control valve, which is fixed on the shell. The shell also includes a valve core locking assembly, which includes a locking contact and a locking spring. The locking contact is movably inserted into the shell, and the locking spring is sleeved on the locking contact and abuts against the inner wall of the shell. One end of the locking contact abuts against the shift V-block, and the other end corresponds to the valve core door of the control valve. When the shift V-block rotates, the locking contact is lifted to lock the reversing valve core of the control valve.

[0015] The present invention also provides a speed shifting system, comprising the above-mentioned gearbox integrated top cover, a whole vehicle air source, an auxiliary box shift cylinder, and a controller, wherein the controller is connected to the whole vehicle air source and the control valve, the control valve is connected to the whole vehicle air source and the auxiliary box shift cylinder, the controller controls the air supply of the whole vehicle air source, and the control valve controls the extension and retraction of the cylinder piston in the auxiliary box shift cylinder according to the controller.

[0016] Compared with the prior art, the gearbox integrated top cover provided by the present invention comprises: a housing, a plurality of gear assemblies corresponding to different gears, the gear assemblies comprising a fork shaft and a gear fork, the plurality of fork shafts being equidistantly parallel and rotatably connected to the housing, the gear forks being connected to the fork shafts in a one-to-one correspondence; a shift mechanism comprising a shift shaft, a shift head, and a shift V-block, the shift shaft being rotatably arranged through the housing, the shift head and the shift V-block being sleeved on the shift shaft and being able to translate relative to the shift shaft and rotate with the shift shaft; and a gear selection mechanism comprising a gear selection shaft, the gear selection shaft being rotatably arranged The gear selector shaft is used to drive the gear shift head to translate along the gear shift shaft and correspond to any of the gear shift forks, and the gear shift shaft rotates to make the gear shift head engage with the corresponding gear shift fork. When shifting gears, the gear selector shaft is first rotated to make the gear shift head translate along the gear shift shaft to correspond to the gear shift fork of the gear to be selected, and the gear shift shaft rotates to make the gear shift head engage with the corresponding gear shift fork to achieve gear shifting. Since the spacing between the shift fork shafts is equal, the travel between adjacent gears is fixed when shifting gears, thereby ensuring the consistency of driving experience.

[0017] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the preferred embodiments of the present invention are described in detail as follows with reference to the accompanying drawings. The specific implementation of the present invention is given in detail by the following embodiments and their accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the gearbox integrated top cover provided by the present invention; Figure 2 yes Figure 1 Schematic diagram of the structure after removing the shell: Figure 3 It is a cross-sectional schematic diagram of the shift shaft of the gearbox integrated top cover provided by the present invention; Figure 4 It is a cross-sectional schematic diagram of the fork shaft of the gearbox integrated top cover provided by the present invention; Figure 5It is a cross-sectional schematic diagram of the self-locking assembly of the gearbox integrated top cover provided by the present invention; Figure 6 It is a cross-sectional schematic diagram of the stop and limit assembly of the gearbox integrated top cover provided by the present invention; Figure 7 It is a module schematic diagram of the gearbox system provided by the present invention.

[0019] Description of reference numerals: 1-housing, 11-in-gear limit assembly, 11a-limit bolt, 11b-limit spring, 11c-limit contact, 12-self-locking assembly, 121-self-locking steel ball, 122-self-locking spring, 13-interlocking assembly, 131-interlocking ball, 132-interlocking pin, 14-valve core locking assembly, 141-locking contact, 2-gear assembly, 21-shift fork shaft, 22-gear shift fork, 3-shift mechanism, 31-shift shaft, 31a-shift rocker arm, 32-shift dial head, 33-shift V-block, 34-thrust block, 35-gear selection balance spring, 4-gear selection mechanism, 41-gear selection shaft, 42-oil seal, 43-limit ring, 5-control valve, 100-transmission integrated top cover, 200-vehicle air source, 300-auxiliary box shift cylinder, 400-controller. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0021] Based on this, see Figure 1-3 The present invention provides a gearbox integrated top cover, comprising: a housing 1, a plurality of gear assemblies 2 corresponding to different gears, the gear assembly 2 comprising a fork shaft 21 and a gear fork 22, a plurality of the fork shafts 21 being equidistantly parallel and rotatably connected to the housing 1, the gear forks 22 being connected to the fork shafts 21 in a one-to-one correspondence; a shift mechanism 3 comprising a shift shaft 31, a shift head 32, and a shift V-block 33, the shift shaft 31 being rotatably arranged through the housing 1, the shift head 32, The shift V-block 33 is sleeved on the shift shaft 31, and can translate relative to the shift shaft 31 and rotate with the shift shaft 31; and the shift mechanism 4 includes a shift shaft 41, and the shift shaft 41 is rotatably arranged on the housing 1 and one end is engaged with the shift head 32; the shift shaft 41 is used to drive the shift head 32 to translate along the shift shaft 31 and correspond to any of the gear forks 22, and the shift shaft 31 rotates to make the shift head 32 engage with the corresponding gear fork 22.

[0022] The present invention comprises: a housing 1, a plurality of gear assemblies 2 corresponding to different gears, the gear assembly 2 comprising a fork shaft 21 and a gear fork 22, a plurality of the fork shafts 21 being parallel and rotatably connected to the housing 1 at equal intervals, and the gear forks 22 being connected to the fork shafts 21 in a one-to-one correspondence; a shift mechanism 3 comprising a shift shaft 31, a shift head 32, and a shift V-block 33, the shift shaft 31 being rotatably arranged in the housing 1, the shift head 32, and the shift V-block 33 being sleeved on the shift shaft 31, being able to translate relative to the shift shaft 31 and rotate with the shift shaft 31; and a gear selection mechanism 4 comprising a shift shaft 41, the shift shaft 41 being rotatably arranged in the housing 1. The shift selector shaft 41 is arranged on the body 1 and one end is engaged with the shift head 32; the shift selector shaft 41 is used to drive the shift head 32 to translate along the shift shaft 31 and correspond to any of the gear forks 22, and the shift shaft 31 is rotated to make the shift head 32 engage with the corresponding gear fork 22. When shifting gears, the shift selector shaft 41 is first rotated to make the shift head 32 translate along the shift shaft 31 to correspond to the gear fork 22 of the gear to be selected, and the shift shaft 31 is rotated to make the shift head 32 engage with the corresponding gear fork 22 to achieve shifting. Since the spacing between the fork shafts 21 is equal, when shifting gears, the stroke between the strokes of adjacent gears is fixed, thereby ensuring the consistency of driving experience.

[0023] Specifically, an in-gear limiting assembly 11 is provided on the inner wall of the housing 1, which is used to abut and limit the shift shaft 31 in the in-gear state, so as to realize the function of shift locking.

[0024] Furthermore, the in-gear limit assembly 11 includes a limit bolt 11a, a limit spring 11b, and a limit contact 11c. The limit bolt 11a is fixed to the inner wall of the housing 1. One end of the limit spring 11b is fixed to the limit bolt 11a, and the other end is fixed to the limit contact 11c. The limit contact 11c abuts against the shift shaft 31. The shift shaft 31 is provided with a plurality of grooves. When the shift shaft 31 is in the gear state, the limit contact 11c is embedded in the groove. In actual use, the limit contact 11c is embedded in the groove to limit the shift shaft 31, so that it is maintained in the gear state to avoid being disengaged from the gear position due to vibration and other reasons. The elasticity of the limit spring 11b is adjustable.

[0025] Specifically, a groove matching the shift knob 32 is formed on the top of the shift fork 22 .

[0026] Furthermore, a self-locking component 12 is provided on the inner wall of the shell 1, and the self-locking component 12 includes a self-locking steel ball 121 and a self-locking spring 122. The fork shaft 21 is provided with grooves corresponding to the front gear, neutral gear and rear gear position points, respectively. One end of the self-locking spring 122 is fixed to the inner wall of the shell 1, and the other end is fixed to the self-locking steel ball 121. The self-locking steel ball 121 just locks the fork shaft 21 in the corresponding groove under the preload force of the self-locking spring 122, which is the so-called self-locking function.

[0027] Furthermore, a pipe is provided on the inner wall of the housing 1, which is connected to the position where the fork shaft 21 is inserted in sequence. An interlocking assembly 13 is provided in the pipe. The interlocking assembly 13 includes an interlocking ball 131 and an interlocking pin 132. The interlocking ball 131 is provided in the pipe, and the interlocking pin 132 is fixed on the fork shaft 21 and abuts against the interlocking ball 131. When any of the fork shafts 21 rotates (i.e., it is in a corresponding gear state), the corresponding interlocking ball 131 will be pushed to move. At this time, the corresponding interlocking balls 131 near the other fork shafts 21 just fall into the grooves of the fork shaft 21 to lock it in a neutral state, which is the so-called interlocking function.

[0028] Specifically, a shift rocker arm 31 a is provided on one end of the shift shaft 31 located outside the housing 1 , and the shift rocker arm 31 a is fixed to the shift shaft 31 via a spline.

[0029] Specifically, a thrust block 34 and a gear selection balance spring 35 are provided on one side of the shift head 32. The thrust block 34 and the gear selection balance spring 35 are sleeved on the shift shaft 31. One end of the gear selection balance spring 35 abuts against the inner wall of the shell, and the other end is fixed to the thrust block 34. Under the action of the gear selection balance spring 35, the thrust block 34 abuts against the shift head 32 to limit the moving stroke of the shift head 32.

[0030] Specifically, an oil seal 42 and a limit ring 43 are provided on the shift select shaft 41 . The oil seal 42 and the limit ring 43 are sleeved on the shift select shaft 41 and abut against the inner wall of the housing 1 .

[0031] Specifically, the gearbox integrated top cover also includes a control valve 5, which is fixed on the housing 1. The housing 1 also includes a valve core locking assembly 14, which includes a locking contact 141 and a locking spring. The locking contact 141 is movably arranged in the housing 1, and the locking spring is sleeved on the locking contact 141 and abuts against the inner wall of the housing 1. One end of the locking contact 141 abuts against the shift V-block 33, and the other end corresponds to the valve core door of the control valve 5. When shifting, after the shift V-block 33 rotates a certain angle, the locking contact 141 is lifted up to lock the reversing valve core of the control valve 5 to maintain the current state.

[0032] The present invention also discloses a transmission system, including the gearbox integrated top cover 100, the whole vehicle air source 200, the auxiliary box shift cylinder 300, and the controller 400. The controller 400 is connected to the whole vehicle air source 200 and the control valve 5. The control valve 5 is connected to the whole vehicle air source 200 and the auxiliary box shift cylinder 300. The controller 400 controls the air supply of the whole vehicle air source 200. The control valve 5 controls the extension and retraction of the cylinder piston in the auxiliary box shift cylinder 300 according to the controller 400.

[0033] When the controller 400 preselects the valve to switch from high gear to low gear in the neutral state, the controller 400 controls the gas to be connected to the control port of the control valve 5. At this time, the locking contact 141 retracts into the housing 1, the valve core of the control valve 5 is unlocked, and the valve core completes the reversal. The vehicle air source enters the low-gear cylinder L of the auxiliary box shift cylinder 300 through ports 1 and 4 of the control valve 5, pushing the cylinder piston to move left and engage in resistance. The gas in the high-gear cylinder H of the auxiliary box shift cylinder 300 is discharged to the outside through ports 2 and 3. After the main box completes the shift, the locking contact 141 extends into the control valve 5 to lock the valve core and prevent it from reversing. When the box is in gear, the controller 400 pre-selected valve switch is switched from the resistance state to the high-low state (the auxiliary box has no action at this time), the main box returns to the neutral position, the locking contact 141 retracts into the housing 1, the valve core of the control valve 5 is locked and the switching is completed, and the air source of the whole vehicle enters the high-gear cylinder H of the auxiliary box shift cylinder 300 through the 1st and 2nd ports of the control valve 5, pushing the cylinder piston to move right to engage the high gear, and the gas in the low-gear cylinder L of the auxiliary box shift cylinder 300 is discharged to the outside through the 4th and 3rd ports; after the main box completes the gear shift, the locking contact 141 extends into the control valve 5 to lock the valve core and cannot switch, thereby solving the virtual gear problem of the auxiliary box.

[0034] When in use, the gear selection process of the gear selection mechanism X is as follows: Figure 3As shown, when the shift selector shaft 41 is in a free state, the shift selector balance springs 35 at both ends make the shift head 32 be in the groove of the 1 / 2 gear fork 22, which is now the middle 1 / 2 gear position; when the shift selector shaft 41 is rotated clockwise from the free state at a certain angle, the shift selector shaft 41 drives the shift head 32 to move to the 3 / 4 gear fork 22, which is now the 3 / 4 gear position; when the shift selector shaft 41 is rotated counterclockwise from the free state at a certain angle, the shift selector shaft 41 drives the shift head 32 to move to the R gear fork 22, which is now the left R gear position.

[0035] The shifting process of the shifting mechanism H is as follows: Figure 3 As shown in the previous gear selection process, when the selected gear is in the middle 1 / 2 gear position, the shift shaft 31 is rotated clockwise or counterclockwise, and the shift head 32 drives the shift fork 22 to move forward or backward, further driving the sliding gear sleeve to complete the 1st and 2nd gear shifting actions; similarly, when the selected gear is in the R gear position, the shift shaft 31 is rotated clockwise or counterclockwise, and the shift head 32 drives the shift fork 22 to move forward or backward, further driving the sliding gear sleeve to complete the R gear shifting action; when the selected gear is in the right 3 / 4 gear position, the shift shaft 31 is rotated clockwise or counterclockwise, and the shift head 32 drives the shift fork 22 to move forward or backward, further driving the sliding gear sleeve to complete the 3rd or 4th gear shifting action.

[0036] Beneficial effects of the present invention: The gearbox integrated top cover provided by the present invention comprises: a housing, a plurality of gear assemblies corresponding to different gears, the gear assembly comprising a fork shaft and a gear fork, the plurality of fork shafts being equidistantly parallel and rotatably connected to the housing, the gear forks being connected to the fork shafts in a one-to-one correspondence; a shift mechanism comprising a shift shaft, a shift head, and a shift V-block, the shift shaft being rotatably arranged through the housing, the shift head and the shift V-block being sleeved on the shift shaft and being able to translate relative to the shift shaft and rotate with the shift shaft; and a gear selection mechanism comprising a gear selection shaft, the gear selection shaft being rotatable The gear selector shaft is used to drive the gear shift head to translate along the gear shift shaft and correspond to any of the gear shift forks, and the gear shift shaft rotates to make the gear shift head engage with the corresponding gear shift fork. When shifting gears, the gear selector shaft is first rotated to make the gear shift head translate along the gear shift shaft to correspond to the gear shift fork of the gear to be selected, and the gear shift shaft rotates to make the gear shift head engage with the corresponding gear shift fork to achieve gear shifting. Since the distances between the shift fork shafts are equal, the travel between adjacent gears is fixed when shifting gears, thereby ensuring the consistency of driving experience.

[0037] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A gearbox integrated top cover, characterized in that: It includes: case, A plurality of gear assemblies corresponding to different gears, the gear assemblies comprising a fork shaft and a gear fork, the plurality of fork shafts being equidistantly parallel and rotatably connected to the housing, the gear forks being connected to the fork shafts in a one-to-one correspondence; A shift mechanism, comprising a shift shaft, a shift knob, and a shift V-block, wherein the shift shaft is rotatably disposed in the housing, the shift knob and the shift V-block are sleeved on the shift shaft and can translate relative to the shift shaft and rotate with the shift shaft; and The gear selection mechanism includes a gear selection shaft, which is rotatably arranged on the shell and one end of which is engaged with the gear shift head; the gear selection shaft is used to drive the gear shift head to translate along the gear shift shaft and correspond to any of the gear shift forks, and the gear shift shaft rotates to engage the gear shift head with the corresponding gear shift fork.

2. The gearbox integrated top cover according to claim 1, characterized in that: An in-gear limiting assembly is provided on the inner wall of the shell, which is used to abut and limit the shift shaft in the in-gear state.

3. The gearbox integrated top cover according to claim 2, characterized in that: The gear limit assembly includes a limit bolt, a limit spring, and a limit contact. The limit bolt is fixed to the inner wall of the shell, one end of the limit spring is fixed to the limit bolt, and the other end is fixed to the limit contact. The limit contact abuts against the shift shaft, and a plurality of grooves are provided on the shift shaft. When the shift shaft is in the gear state, the limit contact is embedded in the groove.

4. The gearbox integrated top cover according to claim 3, characterized in that: A self-locking component is provided on the inner wall of the shell, and the self-locking component includes a self-locking steel ball and a self-locking spring. Grooves are respectively provided on the fork shaft corresponding to the front gear, neutral gear and rear gear position points. One end of the self-locking spring is fixed to the inner wall of the shell, and the other end is fixed to the self-locking steel ball.

5. The gearbox integrated top cover according to claim 4, characterized in that: A pipe is provided on the inner wall of the shell and is connected to the position where the fork shaft is inserted in sequence. An interlocking component is provided in the pipe. The interlocking component includes an interlocking ball and an interlocking pin. The interlocking ball is arranged in the pipe, and the interlocking pin is fixed on the fork shaft and abuts against the interlocking ball.

6. The gearbox integrated top cover according to claim 5, characterized in that: A thrust block and a gear selection balance spring are provided on one side of the gear shift head. The thrust block and the gear selection balance spring are sleeved on the gear shift shaft. One end of the gear selection balance spring abuts against the inner wall of the shell, and the other end is fixed to the thrust block. Under the action of the gear selection balance spring, the thrust block abuts against the gear shift head to limit the movement stroke of the gear shift head.

7. The gearbox integrated top cover according to claim 6, characterized in that: The shift select shaft is provided with an oil seal and a limit ring, and the oil seal and the limit ring are sleeved on the shift select shaft and abut against the inner wall of the housing.

8. The gearbox integrated top cover according to claim 1, characterized in that: A shift rocker arm is provided on one end of the shift shaft located outside the housing, and the shift rocker arm is fixed on the shift shaft through a spline.

9. The gearbox integrated top cover according to claim 7, characterized in that: The gearbox integrated top cover also includes a control valve, which is fixed on the shell. The shell also includes a valve core locking assembly, which includes a locking contact and a locking spring. The locking contact is movably inserted into the shell. The locking spring is sleeved on the locking contact and abuts against the inner wall of the shell. One end of the locking contact abuts against the shift V-block, and the other end corresponds to the valve core door of the control valve. When the shift V-block rotates, the locking contact is lifted to lock the reversing valve core of the control valve.

10. A speed change system, characterized in that: It includes the gearbox integrated top cover as described in claim 9, a whole vehicle air source, an auxiliary box shift cylinder, and a controller, the controller is connected to the whole vehicle air source and the control valve, the control valve is connected to the whole vehicle air source and the auxiliary box shift cylinder, the controller controls the air supply of the whole vehicle air source, and the control valve controls the extension and retraction of the cylinder piston in the auxiliary box shift cylinder according to the controller.

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