A two-stage transmission gearbox for agricultural machinery

Abstract

The present invention discloses a two-stage transmission gearbox for agricultural machinery, comprising a primary gearbox, a transmission sprocket assembly, and a secondary gearbox. The primary and secondary gearboxes are mounted on the main body of the agricultural machinery, the housings of the primary and secondary gearboxes being connected to the transmission sprocket assembly via a connecting device. A power unit is mounted on the housing of the primary gearbox. The primary gearbox comprises a front housing and a rear housing, each housing containing a front transmission mechanism and a rear transmission mechanism, respectively. The front transmission mechanism is connected to the power unit, and the rear transmission mechanism is connected to the traveling device. A transmission mechanism is disposed within the housing of the secondary gearbox. The transmission mechanism of the secondary gearbox comprises an input assembly and an output assembly, and a tillage module is mounted on the output assembly via a drive mechanism. Advantages of the present invention include ease of installation and use, flexible adjustment, comprehensive functionality, compact structure, low cost, and good reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural machinery, and in particular to a two-stage transmission gearbox for agricultural machinery. Background Art

[0002] Agricultural machinery is widely used in tea plantations, orchards, and is closely linked to economic profitability. Different types of equipment are required depending on the terrain, season, and farming requirements. Existing farming machinery, with its relatively simple functions, places low demands on its power system. To meet the requirements for comprehensive functionality and integrated operations in farming machinery, it is necessary to develop a more flexible, safe, and reliable two-stage transmission gearbox for agricultural machinery. Summary of the Invention

[0003] In order to solve the deficiencies of the prior art, the present invention provides a two-stage transmission gearbox for agricultural machinery that is easy to use and has a wide range of applications.

[0004] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0005] A two-stage transmission gearbox for agricultural machinery comprises a primary gearbox, a transmission sprocket assembly and a secondary gearbox, wherein the primary gearbox and the secondary gearbox are mounted on the main body of the agricultural machinery, the housing of the primary gearbox and the housing of the secondary gearbox are connected to the transmission sprocket assembly through a connecting device, and a power device is mounted on the housing of the primary gearbox; the primary gearbox comprises a front housing and a rear housing, a front transmission mechanism and a rear transmission mechanism are respectively arranged in the front housing and the rear housing, the front transmission mechanism is connected to the power device, powered by the power device, and connected to the transmission mechanism of the secondary gearbox through the transmission sprocket assembly to provide power for the secondary gearbox, and the rear transmission mechanism is connected to the traveling device through a driving mechanism to provide power for the traveling device; a transmission mechanism is arranged in the housing of the secondary gearbox, the transmission mechanism of the secondary gearbox comprises an input assembly and an output assembly, the output assembly is mounted with a tillage module through the driving mechanism, the input assembly of the secondary gearbox drives the output assembly of the secondary gearbox under the power output of the primary gearbox, and provides power for the tillage module installed on the output assembly.

[0006] Preferably, the tillage module is at least one of a rotary tillage module, a furrowing module, a soil turning module, a harvesting module, a crushing module, a watering module and a weeding module.

[0007] Preferably, the connecting device is a telescopic connecting rod, which is connected to the connecting device power mechanism. The connecting device power mechanism is hingedly set on the box body of the first-stage gearbox. The connecting device power mechanism adopts a high-power cylinder or oil cylinder, and the rotatable adjustment of the second-stage gearbox is realized through the telescopic connecting rod.

[0008] Preferably, the transmission sprocket assembly includes a first transmission sprocket, a transmission chain and a second transmission sprocket. The first transmission sprocket is installed on the power output shaft of the first gearbox, and the second transmission sprocket is installed on the power input shaft of the second gearbox. The first transmission sprocket drives the second transmission sprocket to rotate through the transmission chain, thereby driving the power input shaft of the second gearbox to rotate.

[0009] Preferably, the front transmission mechanism of the first-stage gearbox includes at least one power input assembly and several front transmission assemblies, the power input assembly includes an integrally installed power input shaft and a power input gear, the front transmission assembly includes an integrally installed front drive shaft and a front drive gear, the power input assembly and each front transmission assembly realize transmission through gear matching, at least one front transmission assembly is also an output assembly, the front drive shaft of the front drive assembly extends out of the box body to constitute the power output shaft of the first-stage gearbox, the rear transmission mechanism of the first-stage gearbox is a variable-speed transmission mechanism, the rear transmission mechanism includes a first rear transmission assembly, a second rear transmission assembly, and a third rear transmission assembly, wherein the first rear transmission assembly is a speed adjustment assembly, and a speed adjustment device is installed on the box body above the first rear transmission assembly, and the rear drive shaft of the third rear transmission assembly extends outward and is connected to the walking device of the agricultural machinery through a driving mechanism.

[0010] Preferably, the primary gearbox includes two or more output assemblies, and except for one output assembly which is used for transmission of the secondary gearbox, the other output assemblies are output assemblies which are used to provide power for the tillage module.

[0011] Preferably, the first rear transmission assembly includes a first rear transmission shaft, a first rear transmission gear is arranged in the middle of the first rear transmission shaft, the first rear transmission gear is key-connected to the first rear transmission shaft, a speed change gear assembly is arranged on each side of the first rear transmission gear, a speed change adjustment device is arranged on the rear box body above the speed change gear assembly, both ends of the first rear transmission shaft are mounted on the rear box body through the first rear mounting bearing, the speed change gear assembly includes an integrally mounted inner speed change gear, an intermediate connecting portion and an outer speed change gear, the speed change adjustment device drives the shift fork to move horizontally left and right through the speed change adjustment rod, and the bottom of the shift fork is embedded in the recessed portion of the intermediate connecting portion The inner speed gear and the outer speed gear are both rotatably mounted on the first rear transmission shaft through bearings. At the same time, the inner speed gear and the inner bearing, the outer speed gear and the inner bearing are all restricted from left and right movement by a sleeve or a step provided on the first rear transmission shaft. The intermediate connecting portion is key-connected with the first rear transmission shaft and can be inserted into the outer speed gear or the inner speed gear along the sliding of the first rear transmission shaft. When the intermediate connecting portion is inserted into the outer speed gear, the outer speed gear is driven to rotate under the drive of the first rear transmission shaft. When the intermediate connecting portion is inserted into the inner speed gear, the inner speed gear is driven to rotate under the drive of the first rear transmission shaft.

[0012] The second rear transmission assembly includes a second rear transmission shaft, which is divided into two left and right sections and is connected in the middle of the left and right sections by a second rear connecting member. Both ends of the second rear transmission shaft are mounted on the rear box body through second rear mounting bearings. A second rear transmission gear assembly is provided on each side of the second rear connecting member. The second rear transmission gear assembly includes a second rear transmission internal gear and a second rear transmission external gear. The second rear transmission internal gear and the second rear transmission external gear are both key-connected to the second rear transmission shaft. The second rear transmission internal gear is provided near the second rear connecting member, and the second rear transmission external gear is provided near the second rear mounting bearing. When the second rear transmission shaft rotates, the second rear transmission internal gear and the second rear transmission external gear are driven to move synchronously.

[0013] The third rear transmission assembly includes a third rear transmission shaft, which is divided into two left and right sections and is connected in the middle of the left and right sections by a third rear connecting piece. Both ends of the third rear transmission shaft are mounted on the rear box body through third rear mounting bearings. A third rear transmission gear assembly is provided on each side of the third rear connecting piece. The third rear transmission gear assembly includes an integrally mounted third rear transmission internal gear and a third rear transmission external gear. The third rear transmission internal gear and the third rear transmission external gear are both key-connected to the third rear transmission shaft. The third rear transmission internal gear and the second rear transmission external gear are both arranged near the third rear mounting bearing. When the third rear transmission shaft rotates, the third rear transmission internal gear and the third rear transmission external gear are driven to move synchronously. A fixed seat is provided in the rear box body, and the second rear connecting piece and the third rear connecting piece are both mounted on the fixed seat.

[0014] Preferably, the second rear connecting member includes an intermediate connecting member and a sleeve bearing assembly located at both ends, and one end of the left section and the right section of the second rear drive shaft are movably mounted on the sleeve bearing assembly of the second rear connecting member, and the other end of the left section and the right section of the second rear drive shaft are mounted on the rear box body through the sleeve bearing assembly, the third rear connecting member has the same structure as the second rear connecting member, and the installation structure of the third rear drive shaft is the same as the installation structure of the second rear drive shaft.

[0015] Preferably, the speed adjustment device includes a gearbox and an intermediate limit block installed on the top plate of the rear box body. There are two gearboxes and they are symmetrically installed on both sides of the intermediate limit block. A speed adjustment rod is movably installed in the two gearboxes. A shift fork is fixed to the middle of the speed adjustment rod by a bolt assembly. The bottom of the shift fork is embedded in the intermediate connecting part of the speed gear assembly. A positioning groove is provided on the speed adjustment rod. A positioning assembly for use with the positioning groove is installed on the gearbox above the positioning groove. The positioning assembly includes an integrally installed positioning bolt, a spring and a steel ball. A connecting rod transmission mechanism is installed at the outer end of the speed adjustment rod. When the speed adjustment rod is driven to move left and right on the gearbox by the connecting rod transmission mechanism, the speed adjustment rod drives the fixed shift fork to push the speed gear assembly on the first rear transmission shaft to move synchronously, and the speed adjustment rod is fixed in position at the positioning groove by the positioning assembly.

[0016] Preferably, the transmission mechanism of the secondary gearbox includes at least one input component and at least one output component, the input component includes an integrally mounted power input shaft and power input gear, the output component includes an integrally mounted power output shaft and power output gear, or the input component includes an integrally mounted input shaft and sprocket, the output component includes an integrally mounted output shaft and sprocket, and the two sprockets of the input component and the output component are connected by a chain; both ends of the power output shaft of the output component extend outward and are provided with an output shaft mounting portion, and a tillage module is mounted on the output shaft mounting portion through a driving mechanism.

[0017] Preferably, the input component of the secondary gearbox includes an integrally mounted power input shaft and a power input gear, the output component includes an integrally mounted power output shaft and a power output gear, and a plurality of transmission components are arranged between the input component and the output component, the transmission component includes an integrally mounted transmission shaft and a transmission gear, each transmission shaft is rotatably mounted on the housing of the secondary gearbox through bearings, and the input component, each transmission component and the output component realize transmission through gear matching.

[0018] Preferably, a secondary input assembly, a first transmission assembly, a secondary output assembly, a second transmission assembly and a third transmission assembly are arranged in the housing of the secondary gearbox. The secondary input shaft of the secondary input assembly, the first transmission shaft of the first transmission assembly, the secondary output shaft of the secondary output assembly, the second transmission shaft of the second transmission assembly and the third transmission shaft of the third transmission assembly are all rotatably mounted on the housing of the secondary gearbox through bearings. The secondary input gear on the secondary input shaft, the first transmission gear on the first transmission shaft and the secondary output gear on the secondary output shaft are meshed in sequence. Both ends of the secondary output shaft extend outward and are provided with secondary output shaft mounting brackets. The secondary input shaft realizes the rotation of the first transmission shaft and the secondary output shaft in sequence through gear transmission under power input, thereby driving the rotation of the secondary output shaft mounting portion; the secondary input gear on the secondary input shaft, the second transmission gear on the second transmission shaft, and the third transmission gear on the third transmission shaft are engaged in sequence, and both ends of the third transmission shaft extend outward and are provided with a third transmission shaft mounting portion. The outer end of the third transmission shaft is mounted on the agricultural machinery body through a third transmission shaft outer bearing. The secondary input shaft realizes the rotation of the second transmission shaft and the third transmission shaft through gear transmission under power input, thereby driving the rotation of the third transmission shaft mounting portion.

[0019] Preferably, a secondary input component a and a secondary output component a are provided in the housing of the secondary gearbox, the secondary input component a includes a secondary input shaft a, which is rotatably mounted on the housing of the secondary gearbox through bearings, both ends of the secondary input shaft a extend outward and are provided with a secondary input shaft a mounting portion, the outer end of the secondary input shaft a is mounted on the agricultural machinery body through an external bearing of the secondary input shaft a, the secondary output component a includes a secondary output shaft a, which is rotatably mounted on the housing of the secondary gearbox through bearings, both ends of the secondary output shaft a extend outward and are provided with a secondary output shaft a mounting portion, a sprocket transmission component is installed between the secondary input component a and the secondary output component a, the sprocket transmission component includes a first sprocket, a chain and a second sprocket, the first sprocket is mounted on the secondary input shaft a, the second sprocket is mounted on the secondary output shaft a, the first sprocket drives the second sprocket to rotate through the chain, thereby driving the secondary output shaft a to rotate.

[0020] The beneficial effects of the present invention are:

[0021] 1. The primary and secondary gearboxes are set separately. The front transmission mechanism of the primary gearbox outputs power to the secondary gearbox through the transmission sprocket assembly. The rear transmission mechanism provides power for the traveling device, and the secondary gearbox provides power for the functional modules of the tillage machinery. The two-stage setting of the gearbox makes the equipment compact and runs smoothly.

[0022] 2. According to the operation needs, the front transmission mechanism of the first-stage gearbox can also provide power through the setting of the output shaft, so as to configure more than two tillage modules and realize the integration of multiple tillage modules;

[0023] 3. By changing the installation position of the secondary gearbox on the agricultural machinery body, the transmission sprocket assembly can be replaced as needed, and the position of the secondary gearbox can be adjusted through the connecting device, with a compact structure and easy adjustment;

[0024] 4. By setting the transmission sprocket assembly on other output shafts of the first-stage gearbox and different input shafts of the second-stage gearbox, or changing the number of transmission components and transmission ratios in the first and second-stage gearboxes, the adjustment is flexible and the applicability is wide;

[0025] 5. The two-stage transmission gearbox for agricultural machinery of the present invention is not only easy to install and use, flexible to adjust, and comprehensive in function, but also has a compact structure, low cost, and good reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is an overall structural diagram of a two-stage transmission gearbox for agricultural machinery according to the present invention;

[0027] Figure 2 A perspective view of a first-stage gearbox according to the present invention;

[0028] Figure 3 This is a front view of the first-stage gearbox of the present invention;

[0029] Figure 4 It is a top cross-sectional view of the first-stage gearbox of the present invention;

[0030] Figure 5 This is a structural diagram of the first rear transmission assembly of the present invention driving the second rear transmission assembly through gears;

[0031] Figure 6 This is a structural diagram of the second rear transmission assembly of the present invention driving the third rear transmission assembly through gears;

[0032] Figure 7 This is a structural diagram of the first rear transmission assembly of the present invention directly driving the third rear transmission assembly through gears;

[0033] Figure 8 This is a schematic structural diagram of the speed adjustment device above the first rear transmission assembly of the present invention;

[0034] Figure 9 This is a front view of an embodiment of a two-stage gearbox of the present invention;

[0035] Figure 10 A top cross-sectional view of an embodiment of a two-stage gearbox of the present invention;

[0036] Figure 11 A top cross-sectional view of another embodiment of a two-stage gearbox according to the present invention;

[0037] In the figure: 1-first stage gearbox, 10-front box body, 11-rear box body, 110-fixed seat, 12-front transmission mechanism, 121-power input assembly, 122-first front transmission assembly, 123-second front transmission assembly, 124-first output assembly, 125-third front transmission assembly, 126-fourth front transmission assembly, 127-fifth front transmission assembly;

[0038] 13-first rear drive shaft, 130-first rear mounting bearing, 131-first rear drive gear, 14-second rear drive shaft, 140-second rear mounting bearing, 141-second rear connecting member, 15-third rear drive shaft, 150-third rear mounting bearing, 151-third rear connecting member, 16-speed gear assembly, 161-inner speed gear, 162-intermediate connecting portion, 163-outer speed gear, 17-second rear drive gear assembly, 171-second rear drive internal gear, 172-second rear drive external gear, 18-third rear drive gear assembly, 181-third rear drive internal gear, 182-third rear drive external gear;

[0039] 2-secondary gearbox, 20-connecting device, 21-transmission sprocket assembly, 22-secondary input assembly, 23-first transmission assembly, 24-secondary output assembly, 241-secondary output shaft mounting portion, 25-secondary transmission assembly, 26-third transmission assembly, 27-third transmission shaft mounting portion, 28-third transmission shaft outer bearing;

[0040] 210 - Secondary input assembly a, 211 - First sprocket, 212 - Chain, 213 - Secondary sprocket, 214 - Secondary input shaft a mounting portion, 215 - Secondary input shaft a outer bearing, 216 - Secondary output assembly a, 217 - Secondary output shaft a mounting portion;

[0041] 3-speed adjustment device, 30-rear box top plate, 31-gearbox, 32-speed adjustment rod, 33-shift fork, 34-positioning groove, 35-positioning assembly, 36-middle limit block. DETAILED DESCRIPTION

[0042] The present invention will be further described below with reference to the accompanying drawings and examples.

[0043] Example 1

[0044] like Figure 1-9 As shown, the present invention provides a two-stage transmission gearbox for agricultural machinery, including a first-stage gearbox 1, a transmission sprocket assembly 21 and a second-stage gearbox 2. The first-stage gearbox 1 is fixedly mounted on the agricultural machinery body, and the housing of the second-stage gearbox 2 is hingedly arranged on the agricultural machinery body. The housing of the first-stage gearbox 1 and the housing of the second-stage gearbox 2 are connected by a connecting device 20. A power device is installed on the housing of the first-stage gearbox 1, and the power device is connected to the power input shaft of the first-stage gearbox 1 through a power transmission mechanism. The power output shaft of the first-stage gearbox 1 and the power input shaft of the second-stage gearbox 2 are connected through the transmission sprocket assembly 21.

[0045] Specifically, the tillage module is at least one of a rotary tillage module, a furrowing module, a soil turning module, a harvesting module, a crushing module, a watering module and a weeding module.

[0046] Specifically, the connecting device 20 is a telescopic connecting rod, which is connected to the power mechanism of the connecting device 20. The power mechanism of the connecting device 20 is hingedly set on the box body of the first-stage gearbox 1. The power mechanism of the connecting device 20 adopts a high-power cylinder or oil cylinder, and the rotatable adjustment of the second-stage gearbox 2 is realized through the telescopic connecting rod.

[0047] Specifically, the transmission sprocket assembly 21 includes a first transmission sprocket, a transmission chain and a second transmission sprocket. The first transmission sprocket is installed on the power output shaft of the first gearbox 1, and the second transmission sprocket is installed on the power input shaft of the second gearbox 2. The first transmission sprocket drives the second transmission sprocket to rotate through the transmission chain, thereby driving the power input shaft of the second gearbox 2 to rotate.

[0048] Specifically, the first-stage gearbox 1 includes an integral front box body 10 and a rear box body 11, and a front transmission mechanism 12 and a rear transmission mechanism are respectively arranged in the front box body 10 and the rear box body 11. The front transmission mechanism 12 includes at least one power input assembly 121 and several front transmission assemblies. The power input assembly 121 includes an integrally installed power input shaft and a power input gear. The front transmission assembly includes an integrally installed front drive shaft and a front drive gear. The power input assembly 121 and each front transmission assembly realize transmission through gear matching. At least one front transmission assembly is also an output assembly. The front drive shaft of the front drive assembly extends out of the box body to form the power output shaft of the first-stage gearbox 1. The rear transmission mechanism is a variable-speed transmission mechanism. The rear transmission mechanism includes a first rear transmission assembly, a second rear transmission assembly, and a third rear transmission assembly, wherein the first rear transmission assembly is a speed adjustment assembly. A speed adjustment device 3 is installed on the box body above the first rear transmission assembly. The rear drive shaft of the third rear transmission assembly extends outward and provides power to the walking device of the agricultural machinery through the drive mechanism. In this embodiment, five front transmission assemblies and a first output assembly 124 are included. The five front transmission assemblies are a first front transmission assembly 122, a second front transmission assembly 123, a third front transmission assembly 125, a fourth front transmission assembly 126, and a fifth front transmission assembly 127. The first output assembly 124 has the same basic structure as the front transmission assembly, that is, the first output assembly 124 is also a front transmission assembly.

[0049] Furthermore, the primary gearbox 1 includes more than two output assemblies. Except for one output assembly used for transmission of the secondary gearbox 2 , the other output assemblies are all output assemblies used to provide power for the tillage module.

[0050] Specifically, the first rear transmission assembly includes a first rear transmission shaft 13, a first rear transmission gear 131 is arranged in the middle of the first rear transmission shaft 13, the first rear transmission gear 131 is key-connected to the first rear transmission shaft 13, a speed change gear assembly 16 is arranged on each side of the first rear transmission gear 131, a speed change adjustment device 3 is provided on the rear housing 11 above the speed change gear assembly 16, and both ends of the first rear transmission shaft 13 are mounted on the rear housing 11 through a first rear mounting bearing 130. The speed change gear assembly 16 includes an integrally mounted inner speed change gear 161, an intermediate connecting portion 162 and an outer speed change gear 163. The speed change adjustment device 3 drives the shift fork 33 to move horizontally left and right through the speed change adjustment rod 32, and the bottom of the shift fork 33 is embedded in the recessed groove of the intermediate connecting portion 162. In the groove, the inner speed gear 161 and the outer speed gear 163 are both rotatably mounted on the first rear transmission shaft 13 through bearings. At the same time, the inner speed gear 161 and the internal bearing, the outer speed gear 163 and the internal bearing are restricted from left and right movement by the sleeve or step set on the first rear transmission shaft 13. The intermediate connecting part 162 is key-connected to the first rear transmission shaft 13 and can be embedded in the outer speed gear 163 or embedded in the inner speed gear 161 along the sliding of the first rear transmission shaft 13. When the intermediate connecting part 162 is embedded in the outer speed gear 163, the outer speed gear 163 is driven to rotate under the drive of the first rear transmission shaft 13. When the intermediate connecting part 162 is embedded in the inner speed gear 161, the inner speed gear 161 is driven to rotate under the drive of the first rear transmission shaft 13.

[0051] The second rear transmission assembly includes a second rear transmission shaft 14, which is divided into two left and right sections and is connected in the middle of the left and right sections by a second rear connecting member 141. Both ends of the second rear transmission shaft 14 are mounted on the rear box body 11 through second rear mounting bearings 140. A second rear transmission gear assembly 17 is provided on each side of the second rear connecting member 141. The second rear transmission gear assembly 17 includes a second rear transmission internal gear 171 and a second rear transmission external gear 172. The second rear transmission internal gear 171 and the second rear transmission external gear 172 are both key-connected to the second rear transmission shaft 14. The second rear transmission internal gear 171 is provided near the second rear connecting member 141, and the second rear transmission external gear 172 is provided near the second rear mounting bearing 140. When the second rear transmission shaft 14 rotates, the second rear transmission internal gear 171 and the second rear transmission external gear 172 are driven to move synchronously.

[0052] The third rear transmission assembly includes a third rear transmission shaft 15, which is divided into two left and right sections and is connected in the middle of the left and right sections by a third rear connecting member 151. Both ends of the third rear transmission shaft 15 are mounted on the rear box body 11 through third rear mounting bearings 150. A third rear transmission gear assembly 18 is provided on each side of the third rear connecting member 151. The third rear transmission gear assembly 18 includes an integrally mounted third rear transmission internal gear 181 and a third rear transmission external gear 182. The third rear transmission internal gear 181 and the third rear transmission external gear 182 are both key-connected to the third rear transmission shaft 15. The third rear transmission internal gear 181 and the second rear transmission external gear 172 are both arranged near the third rear mounting bearing 150. When the third rear transmission shaft 15 rotates, the third rear transmission internal gear 181 and the third rear transmission external gear 182 are driven to move synchronously. A fixing seat 110 is provided in the rear box body 11, and the second rear connecting member 141 and the third rear connecting member 151 are both mounted on the fixing seat 110.

[0053] Furthermore, the second rear connecting member 141 includes an intermediate connecting member and a sleeve bearing assembly located at both ends. The left section and the right section of the second rear drive shaft 14 have one end movably mounted on the sleeve bearing assembly of the second rear connecting member 141, and the other end of the left section and the right section of the second rear drive shaft 14 are mounted on the rear box body 11 through the sleeve bearing assembly. The third rear connecting member 151 has the same structure as the second rear connecting member 141, and the installation structure of the third rear drive shaft 15 is the same as the installation structure of the second rear drive shaft 14.

[0054] Specifically, the speed adjustment device 3 includes a gearbox 31 mounted on the top plate 30 of the rear box body and an intermediate limit block 36. There are two gearboxes 31 and they are symmetrically installed on both sides of the intermediate limit block 36. A speed adjustment rod 32 is movably installed in the two gearboxes 31. A shift fork 33 is fixed to the middle of the speed adjustment rod 32 by a bolt assembly. The bottom of the shift fork 33 is embedded in the middle connecting portion 162 of the speed gear assembly 16. A positioning groove 34 is provided on the speed adjustment rod 32. The gearbox 31 above the positioning groove 34 is A positioning assembly 35 is installed for use with the positioning groove 34. The positioning assembly 35 includes an integrally installed positioning bolt, a spring and a steel ball. A connecting rod transmission mechanism is installed at the outer end of the speed adjustment rod 32. When the speed adjustment rod 32 is driven to move left and right on the gearbox 31 by the connecting rod transmission mechanism, the speed adjustment rod 32 drives the fixed shift fork 33 to push the speed gear assembly 16 on the first rear drive shaft 13 to move synchronously, and the speed adjustment rod 32 is fixed in the positioning groove 34 by the positioning assembly 35.

[0055] Furthermore, the direction from the connecting rod transmission mechanism to the middle limit block 36 divides the positioning groove 34 into positioning groove 1, positioning groove 2, and positioning groove 3. This process includes three states:

[0056] (1) The intermediate connecting portion 162 is not in contact with the inner and outer speed gears 163: The first rear transmission shaft 13 is driven to rotate by the first rear transmission gear 131. When the intermediate connecting portion 162 of the speed gear assembly 16 is separated from the inner and outer speed gears 163, since the inner and outer speed gears 163 are only movably mounted on the first rear transmission shaft 13 through bearings, the rotation of the first rear transmission shaft 13 does not drive the inner and outer speed gears 163 to rotate. At this time, the second and third rear transmission shafts 15 and the traveling device are not driven by power, thereby achieving the effect of adjusting the speed change;

[0057] (2) The intermediate connecting portion 162 is embedded in the inner speed gear 161: the first rear transmission shaft 13 drives the inner speed gear 161 to rotate. At this time, the intermediate connecting portion 162 is separated from the outer speed gear 163, and the outer speed gear 163 is only movably mounted on the first rear transmission shaft 13 through the bearing, so that when the first rear transmission shaft 13 rotates, it does not drive the outer speed gear 163 to rotate. The inner speed gear 161 drives the second rear transmission internal gear 171 to rotate. The second rear transmission internal gear 171 drives the second rear transmission external gear 172 to rotate through the second rear transmission shaft 14. The second rear transmission external gear 172 drives the third rear transmission external gear 182 to rotate. The third rear transmission external gear 182 drives the third rear transmission shaft 15 to rotate and provides power to the walking device through the driving mechanism.

[0058] (3) The intermediate connecting portion 162 is embedded in the outer speed gear 163: the first rear transmission shaft 13 drives the outer speed gear 163 to rotate. At this time, the intermediate connecting portion 162 is separated from the inner speed gear 161, and the inner speed gear 161 is only movably mounted on the first rear transmission shaft 13 through the bearing, so that when the first rear transmission shaft 13 rotates, it does not drive the inner speed gear 161 to rotate. The outer speed gear 163 drives the third rear transmission internal gear 181 to rotate, and the third rear transmission internal gear 181 drives the third rear transmission shaft 15 to rotate and provides power to the walking device through the driving mechanism.

[0059] It can be understood that in the second state, when the first rear transmission shaft 13 rotates counterclockwise to drive the internal speed gear 161 to rotate counterclockwise, the second rear transmission internal gear 171 and the second rear transmission external gear 172 both rotate clockwise, and the third rear transmission external gear 182 rotates counterclockwise, so that the walking device moves forward. In the third state, when the first rear transmission shaft 13 rotates to drive the external speed gear 163 to rotate counterclockwise, the third rear transmission internal gear 181 directly driven by it rotates clockwise, so that the walking device moves backward. Therefore, the forward and backward movement conversion of the walking device can be quickly achieved through the speed adjustment device 3. Of course, it is also possible to adjust the first rear transmission shaft 13 to rotate clockwise in the first state, and then in the third state, when the first rear transmission shaft 13 rotates to drive the external speed gear 163 to rotate clockwise, the third rear transmission internal gear 181 directly driven by it rotates counterclockwise, so that the walking device still moves forward.

[0060] Specifically, a transmission mechanism is provided in the housing of the secondary gearbox 2, and the transmission mechanism includes at least one input component, several transmission components and at least one output component, wherein the input component includes an integrally installed power input shaft and a power input gear, the output component includes an integrally installed power output shaft and a power output gear, the transmission component includes an integrally installed transmission shaft and a transmission gear, and each transmission shaft is rotatably mounted on the housing of the secondary gearbox 2 through bearings, and the input component, each transmission component and the output component are transmitted through gear matching. The two ends of the power output shaft of the output component extend outward and are provided with an output shaft mounting portion, and a tillage module is installed on the output shaft mounting portion through a driving mechanism. The input component of the secondary gearbox 2 drives the output component of the secondary gearbox 2 under the power output of the primary gearbox 1, thereby providing power for the tillage module installed on the output shaft.

[0061] Furthermore, a secondary input assembly 22, a first transmission assembly 23, a secondary output assembly 24, a second transmission assembly 25 and a third transmission assembly 26 are provided in the housing of the secondary gearbox 2. The secondary input shaft of the secondary input assembly 22, the first transmission shaft of the first transmission assembly 23, the secondary output shaft of the secondary output assembly 24, the second transmission shaft of the second transmission assembly 25 and the third transmission shaft of the third transmission assembly 26 are all rotatably mounted on the housing of the secondary gearbox 2 through bearings. The secondary input gear on the secondary input shaft, the first transmission gear on the first transmission shaft and the secondary output gear of the secondary output shaft are meshed in sequence. Both ends of the secondary output shaft extend outward and are provided with a secondary output shaft mounting portion 241. Under power input, the secondary input shaft realizes the rotation of the first transmission shaft and the secondary output shaft in sequence through gear transmission, thereby driving the rotation of the secondary output shaft mounting portion 241.

[0062] At the same time, the secondary input gear on the secondary input shaft, the second transmission gear on the second transmission shaft, and the third transmission gear on the third transmission shaft are meshed in sequence. Both ends of the third transmission shaft extend outward and are provided with a third transmission shaft mounting portion 27. The outer end of the third transmission shaft is mounted on the agricultural machinery body through a third transmission shaft outer bearing 28. Under power input, the secondary input shaft realizes the rotation of the second transmission shaft and the third transmission shaft through gear transmission, thereby driving the rotation of the third transmission shaft mounting portion 27.

[0063] Example 2

[0064] like Figure 10 As shown, the present invention provides a two-stage transmission gearbox for agricultural machinery, which has the same main structure as that of Example 1, but has a different transmission structure of the two-stage gearbox 2, specifically: a two-stage input assembly a210 and a two-stage output assembly a216 are provided in the housing of the two-stage gearbox 2, the two-stage input assembly a210 includes a two-stage input shaft a, which is rotatably mounted on the housing of the two-stage gearbox 2 through a bearing, the two ends of the two-stage input shaft a extend outward and are provided with a two-stage input shaft a mounting portion 214, the outer end of the two-stage input shaft a is mounted on the agricultural machinery body through a two-stage input shaft a outer bearing 215, and the two-stage output assembly a216 is provided. 6 includes a secondary output shaft a, which is rotatably mounted on the housing of the secondary gearbox 2 through a bearing. Both ends of the secondary output shaft a extend outward and are provided with a secondary output shaft a mounting portion 217. A sprocket transmission assembly is installed between the secondary input component a210 and the secondary output component a216. The sprocket transmission assembly includes a first sprocket 211, a chain 212 and a second sprocket 213. The first sprocket 211 is mounted on the secondary input shaft a, and the second sprocket 213 is mounted on the secondary output shaft a. The first sprocket 211 drives the second sprocket 213 to rotate through the chain 212, thereby driving the secondary output shaft a to rotate.

[0065] It should be noted that the above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Equivalent modifications made based on the above embodiments fall within the scope of protection of the present invention.

Claims

1. A two-stage transmission gearbox for agricultural machinery, comprising a primary gearbox, a transmission sprocket assembly, and a secondary gearbox, characterized in that: The primary gearbox and the secondary gearbox are installed on the agricultural machinery body, the housing of the primary gearbox and the housing of the secondary gearbox are connected to the transmission sprocket assembly through a connecting device, the housing of the primary gearbox is installed with a power device, the primary gearbox includes a front housing and a rear housing, the front housing and the rear housing are respectively provided with a front transmission mechanism and a rear transmission mechanism, the front transmission mechanism is connected to the power device and is connected to the transmission mechanism of the secondary gearbox through the transmission sprocket assembly, the rear transmission mechanism is connected to the walking device through a driving mechanism, a transmission mechanism is provided in the housing of the secondary gearbox, the transmission mechanism of the secondary gearbox includes an input assembly and an output assembly, and the output assembly is provided with a tillage module through a driving mechanism; The tillage module is at least one of a rotary tillage module, a furrowing module, a soil turning module, a harvesting module, a crushing module, a watering module and a weeding module; the connecting device is a retractable connecting rod, which is connected to a connecting device power mechanism, and the connecting device power mechanism is hingedly arranged on the housing of the primary gearbox, and the connecting device power mechanism adopts a high-power cylinder or oil cylinder; the transmission sprocket assembly includes a first transmission sprocket, a transmission chain and a second transmission sprocket, the first transmission sprocket is installed on the power output shaft of the primary gearbox, and the second transmission sprocket is installed on the power input shaft of the secondary gearbox, and the first transmission sprocket drives the second transmission sprocket to rotate through the transmission chain, thereby driving the power input shaft of the secondary gearbox to rotate; The front transmission mechanism of the first-stage gearbox includes at least one power input assembly and several front transmission assemblies, the power input assembly includes an integrally installed power input shaft and a power input gear, the front transmission assembly includes an integrally installed front drive shaft and a front drive gear, the power input assembly and each front transmission assembly realize transmission through gear matching, at least one front transmission assembly is also an output assembly, the front drive shaft of the front transmission assembly extends out of the box body to constitute the power output shaft of the first-stage gearbox, the rear transmission mechanism of the first-stage gearbox is a variable-speed transmission mechanism, the rear transmission mechanism includes a first rear transmission assembly, a second rear transmission assembly, and a third rear transmission assembly, wherein the first rear transmission assembly is a speed adjustment assembly, and a speed adjustment device is installed on the box body above the first rear transmission assembly, and the rear drive shaft of the third rear transmission assembly extends outward and is connected to the traveling device of the agricultural machinery through a driving mechanism; the first-stage gearbox includes more than two output assemblies, except that one output assembly is an output assembly for secondary gearbox transmission, and the other output assemblies are output assemblies for providing power to the tillage module.

2. The two-stage transmission gearbox for agricultural machinery according to claim 1, characterized in that: The first rear transmission assembly includes a first rear transmission shaft, a first rear transmission gear is arranged in the middle of the first rear transmission shaft, the first rear transmission gear is key-connected to the first rear transmission shaft, a speed change gear assembly is arranged on each side of the first rear transmission gear, a speed change adjustment device is arranged on the rear housing above the speed change gear assembly, both ends of the first rear transmission shaft are mounted on the rear housing through first rear mounting bearings, the speed change gear assembly includes an integrally mounted inner speed change gear, an intermediate connecting portion and an outer speed change gear, the speed change adjustment device drives the shift fork to move horizontally left and right through the speed change adjustment rod, and the bottom of the shift fork is embedded in the groove of the intermediate connecting portion The inner speed gear and the outer speed gear are both rotatably mounted on the first rear transmission shaft through bearings. At the same time, the inner speed gear and the inner bearing, the outer speed gear and the inner bearing are all restricted from left and right movement by a sleeve or a step provided on the first rear transmission shaft. The intermediate connecting portion is key-connected with the first rear transmission shaft and can be inserted into the outer speed gear or the inner speed gear along the sliding of the first rear transmission shaft. When the intermediate connecting portion is inserted into the outer speed gear, the outer speed gear is driven to rotate under the drive of the first rear transmission shaft. When the intermediate connecting portion is inserted into the inner speed gear, the inner speed gear is driven to rotate under the drive of the first rear transmission shaft. The second rear transmission assembly includes a second rear transmission shaft, which is divided into two left and right sections and is connected in the middle of the left and right sections by a second rear connecting member. Both ends of the second rear transmission shaft are mounted on the rear box body through second rear mounting bearings. A second rear transmission gear assembly is provided on each side of the second rear connecting member. The second rear transmission gear assembly includes a second rear transmission internal gear and a second rear transmission external gear. The second rear transmission internal gear and the second rear transmission external gear are both key-connected to the second rear transmission shaft. The second rear transmission internal gear is provided near the second rear connecting member, and the second rear transmission external gear is provided near the second rear mounting bearing. When the second rear transmission shaft rotates, the second rear transmission internal gear and the second rear transmission external gear are driven to move synchronously. The third rear transmission assembly includes a third rear transmission shaft, which is divided into two left and right sections and is connected in the middle of the left and right sections by a third rear connecting piece. Both ends of the third rear transmission shaft are mounted on the rear box body through third rear mounting bearings. A third rear transmission gear assembly is provided on each side of the third rear connecting piece. The third rear transmission gear assembly includes an integrally mounted third rear transmission internal gear and a third rear transmission external gear. The third rear transmission internal gear and the third rear transmission external gear are both key-connected to the third rear transmission shaft. The third rear transmission internal gear and the second rear transmission external gear are both arranged near the third rear mounting bearing. When the third rear transmission shaft rotates, the third rear transmission internal gear and the third rear transmission external gear are driven to move synchronously. A fixed seat is provided in the rear box body, and the second rear connecting piece and the third rear connecting piece are both mounted on the fixed seat.

3. The two-stage transmission gearbox for agricultural machinery according to claim 2, characterized in that: The second rear connecting member includes an intermediate connecting member and a sleeve bearing assembly at both ends. One end of the left section and the right section of the second rear drive shaft is movably mounted on the sleeve bearing assembly of the second rear connecting member, and the other ends of the left section and the right section of the second rear drive shaft are mounted on the rear box body through the sleeve bearing assembly. The third rear connecting member has the same structure as the second rear connecting member, and the installation structure of the third rear drive shaft is the same as the installation structure of the second rear drive shaft.

4. The two-stage transmission gearbox for agricultural machinery according to claim 2, characterized in that: The speed adjustment device includes a gearbox and an intermediate limit block installed on the top plate of the rear box body. There are two gearboxes and they are symmetrically installed on both sides of the intermediate limit block. A speed adjustment rod is movably installed in the two gearboxes. A shift fork is fixed to the middle part of the speed adjustment rod by a bolt assembly. The bottom of the shift fork is embedded in the intermediate connecting part of the speed gear assembly. A positioning groove is provided on the speed adjustment rod. A positioning assembly used in conjunction with the positioning groove is installed on the gearbox above the positioning groove. The positioning assembly includes an integrally installed positioning bolt, a spring and a steel ball. A connecting rod transmission mechanism is installed at the outer end of the speed adjustment rod. When the speed adjustment rod is driven to move left and right on the gearbox by the connecting rod transmission mechanism, the speed adjustment rod drives the fixed shift fork to push the speed gear assembly on the first rear transmission shaft to move synchronously, and the speed adjustment rod is fixed in position at the positioning groove by the positioning assembly.

5. The two-stage transmission gearbox for agricultural machinery according to claim 1, characterized in that: The transmission mechanism of the two-stage gearbox includes at least one input component and at least one output component, the input component includes an integrally mounted power input shaft and a power input gear, the output component includes an integrally mounted power output shaft and a power output gear, or the input component includes an integrally mounted input shaft and a sprocket, the output component includes an integrally mounted output shaft and a sprocket, and the two sprockets of the input component and the output component are connected by a chain; both ends of the power output shaft of the output component extend outward and are provided with an output shaft mounting portion, and a tillage module is mounted on the output shaft mounting portion through a driving mechanism.

6. The two-stage transmission gearbox for agricultural machinery according to claim 5, characterized in that: The input component of the two-stage gearbox includes an integrally mounted power input shaft and a power input gear, and the output component includes an integrally mounted power output shaft and a power output gear. Several transmission components are arranged between the input component and the output component. The transmission component includes an integrally mounted transmission shaft and a transmission gear. Each transmission shaft is rotatably mounted on the housing of the two-stage gearbox through a bearing. The input component, each transmission component and the output component realize transmission through gear matching.

7. The two-stage transmission gearbox for agricultural machinery according to claim 5, characterized in that: A secondary input assembly, a first transmission assembly, a secondary output assembly, a second transmission assembly and a third transmission assembly are arranged in the housing of the secondary gearbox. The secondary input shaft of the secondary input assembly, the first transmission shaft of the first transmission assembly, the secondary output shaft of the secondary output assembly, the second transmission shaft of the second transmission assembly and the third transmission shaft of the third transmission assembly are all rotatably mounted on the housing of the secondary gearbox through bearings. The secondary input gear on the secondary input shaft, the first transmission gear on the first transmission shaft and the secondary output gear of the secondary output shaft are meshed in sequence. Both ends of the secondary output shaft extend outward and are provided with a secondary output shaft mounting portion. Under power input, the secondary input shaft realizes the rotation of the first transmission shaft and the secondary output shaft in sequence through gear transmission, thereby driving the rotation of the secondary output shaft mounting portion. The secondary input gear on the secondary input shaft, the second transmission gear on the second transmission shaft and the third transmission gear on the third transmission shaft are meshed in sequence. Both ends of the third transmission shaft extend outward and are provided with a third transmission shaft mounting portion. The outer end of the third transmission shaft is mounted on the agricultural machinery body through a third transmission shaft outer bearing. Under power input, the secondary input shaft realizes the rotation of the second transmission shaft and the third transmission shaft through gear transmission, thereby driving the rotation of the third transmission shaft mounting portion.

8. The two-stage transmission gearbox for agricultural machinery according to claim 5, characterized in that: A secondary input assembly a and a secondary output assembly a are arranged in the housing of the secondary gearbox, the secondary input assembly a including a secondary input shaft a, which is rotatably mounted on the housing of the secondary gearbox through bearings, the two ends of the secondary input shaft a extending outward and provided with a secondary input shaft a mounting portion, the outer end of the secondary input shaft a is mounted on the agricultural machinery body through an external bearing of the secondary input shaft a, the secondary output assembly a including a secondary output shaft a, which is rotatably mounted on the housing of the secondary gearbox through bearings, the two ends of the secondary output shaft a extending outward and provided with a secondary output shaft a mounting portion, a sprocket transmission assembly is installed between the secondary input assembly a and the secondary output assembly a, the sprocket transmission assembly including a first sprocket, a chain and a second sprocket, the first sprocket being mounted on the secondary input shaft a, the second sprocket being mounted on the secondary output shaft a, the first sprocket driving the second sprocket to rotate through the chain, thereby driving the secondary output shaft a to rotate.

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