A field conveyor transmission mechanism with drive switching function

Abstract

The present invention relates to a field conveyor transmission mechanism with a drive switching function, which belongs to the technical field of transmission devices; the invention comprises a diesel engine transmission mechanism, a transmission shaft and a front wheel drive shaft installed on a supporting frame, the diesel engine transmission mechanism is detachably connected to the tractor frame through a connecting assembly, the transmission shaft is connected to the adapter shaft through a coupling, the adapter shaft is detachably connected to the rear wheel drive shaft, both ends of the front wheel drive shaft are detachably connected to the front wheel shaft, the outer end of the front wheel shaft is mounted with a hub disk through a bearing, the wheel hub disk is detachably mounted with a hub through bolts, the outer end of the wheel hub is fixedly mounted with a base, the front wheel shaft and the base are detachably connected through a clamping assembly, the driving state of the tractor driven by the diesel engine transmission mechanism can be switched by disassembling and assembling the clamping assembly, the diesel engine transmission mechanism can be used as the driving power of the rotary tiller, thus realizing multi-purpose of one machine, effectively improving the application range of the diesel engine transmission mechanism, and effectively reducing the procurement cost of agricultural machinery.

Description

Technical Field

[0001] The invention relates to a field conveyor transmission mechanism with a drive switching function, belonging to the technical field of transmission devices. Background Art

[0002] Diesel engines are commonly used as driving power mechanisms in construction machinery, agricultural machinery, and other fields. In particular, agricultural machinery such as rotary tillers and walking tractors are mostly powered by separate diesel engines. This results in poor interchangeability between different agricultural machinery, requiring farmers to purchase multiple machines for production, resulting in high procurement costs. Currently, there are also four-wheel-drive walking tractors equipped with dual-output shaft air-cooled diesel engines that simultaneously drive both the front and rear wheels. These four-wheel-drive walking tractors can be connected to trailers for field transport operations or, after removing the trailer and drive wheels, attached to rotary tiller blades for tillage operations. However, the connection structure between the walking tractor, trailer, and rotary tiller blades is complex, making assembly and disassembly difficult. Furthermore, while these four-wheel-drive walking tractors can travel at high speeds when transporting agricultural materials such as grain, seeds, and fertilizers in the field, they suffer from poor climbing ability, low climbing efficiency, and transmission losses when crawling at low speed on steep slopes.

[0003] In the prior art, there are also tractor transmission systems with convertible drive modes, such as a multi-purpose four-wheel drive gearbox for tractors disclosed in Chinese patent publication number CN216666422U, in which the driving shaft sleeve is fixed on the rear drive output shaft and rotates with the rear drive output shaft, and the driven shaft sleeve is movably installed on the front drive output shaft, slides backward and locks on the front drive output shaft and then engages with the driving shaft sleeve, and then drives the front drive output shaft to rotate, realizing synchronous rotation of the front and rear drives; the driven shaft sleeve slides backward and disengages from the driving shaft sleeve, and continues to slide backward and engages with the front drive output shaft. The output shaft disengages and then remains stationary, and the front drive output shaft still maintains passive synchronous rotation with the rear drive output shaft driven by the front drive running mechanism; and a multifunctional four-wheel drive transfer case disclosed in Chinese patent publication number CN208749930U, which, when switched to the rear drive gear, requires the front axle coupling sleeve to be coupled only to the front axle, and the rear axle coupling sleeve to be coupled to the rear axle and the four-wheel drive driven gear at the same time; when switched to the four-wheel drive gear, the front axle coupling sleeve needs to be coupled to the front axle and the four-wheel drive driven gear at the same time, and the rear axle coupling sleeve needs to be coupled to the rear axle and the four-wheel drive driven gear at the same time.

[0004] However, the above transmission system has problems such as a complex transmission mechanism structure, a large gearbox size, and a large transmission system mass. It is not suitable for use with a small rotary tillage blade group, and has a high overall manufacturing cost and a high equipment procurement cost. Summary of the Invention

[0005] In order to overcome the problems existing in the background technology, the present invention proposes a field conveyor transmission mechanism with a drive switching function, wherein the diesel engine transmission mechanism is detachably connected to the tractor frame by installing a connecting component, the transmission shaft is detachably connected to the rear wheel drive shaft by a cross-axis universal coupling, the wheel hub is installed on the front wheel shaft by a bearing, and a detachable clamping component is installed between the front wheel shaft and the wheel hub, and the front wheel shaft is detachably connected to the front wheel drive shaft, so that the diesel engine transmission mechanism can drive the tractor to switch between rear-wheel drive and four-wheel drive states by disassembling and assembling the clamping component, the disassembly and assembly is convenient, and the disassembly and assembly efficiency is high. The diesel engine transmission mechanism can be used as the driving power of the rotary tiller by disassembling and assembling the connecting component, the cross-axis universal coupling, and the front wheel shaft, and the existing diesel engine transmission mechanism can be directly used without the need to modify or replace the diesel engine transmission mechanism, so that one machine can be used for multiple purposes, effectively improving the application range of the diesel engine transmission mechanism and effectively reducing the procurement cost of agricultural machinery.

[0006] To solve the above problems, the present invention is implemented through the following technical solutions:

[0007] The tractor has a transmission mechanism which is detachably connected to the front wheel axle of the tractor frame and which is adapted to drive the tractor to rotate relative to the front wheel axle.

[0008] Preferably, the connecting assembly includes a connecting frame, a fixing rod, a sleeve, a pin, a locking nut a, and a locking nut b. The connecting frame is fixedly mounted on the diesel engine transmission mechanism, the fixing rod is horizontally fixedly mounted on the tractor frame 8, and a sleeve is vertically mounted at the front end of the fixing rod. The sleeve is rotatably mounted on the connecting frame through a pin. The pin consists of an intermediate optical axis section, an upper threaded section, and a lower threaded section. The intermediate optical axis section is arranged inside the sleeve. The threads on the upper threaded section and the lower threaded section of the pin have opposite rotation directions, and the upper threaded section and the lower threaded section are respectively mounted with a locking nut a and a locking nut b.

[0009] Preferably, the middle optical axis section of the pin passes through the upper and lower ends of the connecting frame, and a positioning plate is provided between the middle optical axis section of the pin and the upper threaded section, and a positioning groove matching the positioning plate is provided at the upper end of the connecting frame.

[0010] Preferably, the clamping assembly includes at least two cross-arranged clamping plates and a bearing pressure plate installed on the inner side of the clamping plate. The clamping plate is arranged in the clamping groove of the front wheel axle. The middle position of the clamping plate is detachably connected to the front wheel axle through a locking bolt. The outer end of the clamping plate is detachably connected to the base on the wheel hub through a locking bolt. The bearing pressure plate is an annular plate that matches the outer ring of the bearing. After the clamping plate is installed on the front wheel axle, the bearing pressure plate presses against the outer ring of the bearing.

[0011] Preferably, a columnar protrusion is provided at the outer end of the clamping plate, and the locking bolt is installed at the position of the columnar protrusion.

[0012] Preferably, a bearing end cover can also be installed at the installation position of the clamping assembly, the outer end of the front wheel axle passes through the bearing end cover, and the bearing end cover is detachably connected to the base on the wheel hub through a locking bolt.

[0013] Preferably, the adapter shaft and the rear wheel drive shaft are detachably connected via a cross-axis universal joint.

[0014] Preferably, the front wheel drive shaft is a regular polygonal prism, and the front wheel shaft includes a regular polygonal prism section and a cylindrical section. The inner end of the regular polygonal prism section is provided with a hollow section, and the cross-sectional shape of the hollow section matches the front wheel drive shaft. The front wheel shaft is plugged into the front wheel drive shaft through the hollow section, and the hollow section of the front wheel shaft is detachably connected to the front wheel drive shaft through pin a and pin b, and pin a and pin b are vertically cross-staggered. The cross-sectional shape of the front wheel drive shaft matches the knife shaft of the rotary tiller knife group.

[0015] Preferably, a support rod a and a support rod b are respectively installed at the front and rear ends of the support frame.

[0016] The beneficial effects of the present invention are:

[0017] The present invention enables the diesel engine transmission mechanism to be detachably connected to the tractor frame by installing a connecting assembly, enables the transmission shaft to be detachably connected to the rear wheel drive shaft by a cross-axis universal coupling, mounts the wheel hub on the front wheel shaft by a bearing, and installs a detachable clamping assembly between the front wheel shaft and the wheel hub, so that the front wheel shaft and the front wheel drive shaft are detachably connected, thereby enabling the diesel engine transmission mechanism to drive the tractor to switch between rear-wheel drive and four-wheel drive driving states by disassembling and assembling the clamping assembly, the disassembly and assembly is convenient, and the disassembly and assembly efficiency is high. The diesel engine transmission mechanism can be used as the driving power of the rotary tiller by disassembling and assembling the connecting assembly, the cross-axis universal coupling, and the front wheel shaft, and the existing diesel engine transmission mechanism can be directly used without the need to modify or replace the diesel engine transmission mechanism, thereby achieving multiple uses of one machine, effectively improving the application range of the diesel engine transmission mechanism, and effectively reducing the procurement cost of agricultural machinery. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] Figure 2 is a front cross-sectional view of the connection assembly of the present invention;

[0020] Figure 3 for Figure 1 A magnified view of part A;

[0021] Figure 4 A top half-section view of the front wheel drive shaft of the present invention;

[0022] Figure 5 It is a left side sectional view of the front wheel drive shaft of the present invention.

[0023] Explanation of the reference numerals: 1-support frame, 2-diesel engine transmission mechanism, 3-drive shaft, 4-front wheel drive shaft, 5-connecting assembly, 6-clamping assembly, 7-front wheel shaft, 8-tractor frame, 9-coupling, 10-adapter shaft, 11-rear wheel drive shaft, 12-bearing, 13-hub disc, 14-bolt, 15-hub, 16-base, 701-cage, 501-connecting frame, 502-fixing rod, 503-sleeve, 504-pin shaft, 505-locking nut a, 506-locking Nut b, 507-positioning plate, 5011-positioning groove, 5041-middle optical axis section, 5042-upper threaded section, 5043-lower threaded section, 601-clamping plate, 602-bearing pressure plate, 603-columnar protrusion, 604-locking bolt, 17-bearing end cover, 18-cross-axis universal joint, 700-clip groove, 701-regular polygonal prism section, 702-cylindrical section, 703-hollow section, 19-latch a, 20-latch b, 21-support rod a, 22-support rod b. DETAILED DESCRIPTION

[0024] In order to make the objectives, technical solutions, achieved objectives and effects of the present invention clear and easy to understand, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that technicians can understand them.

[0025] It should be noted that in the description of the present invention, unless otherwise specified or defined, the terms “installed”, “connected”, “connected”, “connected”, etc. should be understood in a broad sense, that is, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0026] In the present invention, Figure 1-5 As shown, a field conveyor transmission mechanism with a drive switching function includes a diesel engine transmission mechanism 2 installed on a support frame 1, and a transmission shaft 3 and a front wheel drive shaft 4 driven and connected to the diesel engine transmission mechanism 2. The transmission shaft 3 and the front wheel drive shaft 4 are arranged vertically and crosswise. In this embodiment, the diesel engine transmission mechanism 2 is composed of an air-cooled diesel engine and two reducers arranged vertically and crosswise. The above is the prior art. In this embodiment, the specific structure and principle of the air-cooled diesel engine and the two reducers are no longer described. The present invention transforms a walking tractor equipped with an air-cooled diesel engine. While the air-cooled diesel engine is used for the walking tractor, the rear drive and four-wheel drive of the walking tractor can be switched by disassembly and assembly, replacement of parts, etc., and the air-cooled diesel engine can be used in a rotary tiller.

[0027] In this embodiment, the diesel engine transmission mechanism 2 is detachably connected to the tractor frame 8 via a connecting assembly 5, so that the diesel engine transmission mechanism 2, the transmission shaft 3, and the front wheel drive shaft 4 can be separated from the tractor frame 8 by removing the connecting assembly 5, thereby allowing the diesel engine transmission mechanism 2 to be used as a driving power source for the rotary tiller. The transmission shaft 3 is connected to the adapter shaft 10 through a coupling 9, and the adapter shaft 10 is detachably connected to the rear wheel drive shaft 11. The rear wheel drive shaft 11 is connected to the rear axle of the tractor to drive the rear wheel to rotate, thereby driving the rear wheel of the tractor to rotate through the diesel engine transmission mechanism 2. At the same time, the diesel engine transmission mechanism 2 can be separated from the tractor frame 8 by removing the connection point between the adapter shaft 10 and the rear wheel drive shaft 11. Preferably, the adapter shaft 10 and the rear wheel drive shaft 11 are detachably connected through a cross-axis universal coupling 18, which is convenient for disassembly and assembly and has high disassembly and assembly efficiency. In this embodiment, when the diesel engine transmission mechanism 2 is connected to the trailer for performing transportation operations, the tractor should also include an armrest installed on the diesel engine transmission mechanism 2, as well as components such as a clutch, a brake, a rear wheel, a rear axle, and a carriage (not shown in the accompanying drawings). The above is prior art and the above components are no longer described in this embodiment.

[0028] The two ends of the front wheel drive shaft 4 are detachably connected to the front wheel shaft 7, and the outer end of the front wheel shaft 7 is installed with a hub disk 13 through a bearing 12, and the hub disk 13 is detachably installed with a wheel hub 15 through a bolt 14. The outer end of the wheel hub 15 is fixedly installed with a base 16, and the front wheel shaft 7 and the base 16 are detachably connected through a clamping assembly 6. The outer end of the front wheel shaft 7 is provided with a clamping groove 700 for facilitating the installation of the clamping assembly 6. After the clamping assembly 6 is installed between the front wheel shaft 7 and the base 16, the front wheel drive shaft 4 drives the wheel hub 15 to rotate synchronously through the front wheel shaft 7, so that the front wheel shaft 7 and the wheel hub 15 can be fixed by the clamping assembly 6. At this time, the diesel engine transmission mechanism 2 drives the front wheel drive shaft 4 to rotate, and the front wheel drive shaft 4 drives the front wheel shaft 7 to rotate, and the front wheel shaft 7 drives the wheel hub 15 to rotate synchronously through the clamping assembly 6, so that the tire installed on the wheel hub 15 follows the wheel The hub 15 rotates. At this time, the tractor is in a four-wheel drive state, that is, the diesel engine transmission mechanism 2 drives the transmission shaft 3 to rotate and drive the rear wheels of the tractor to rotate, and the diesel engine transmission mechanism 2 drives the front wheel drive shaft 4 to rotate and drive the front wheels of the tractor to rotate; the front wheel axle 7 and the base 16 on the wheel hub 15 are detachably connected through the clamping assembly 6, so that the wheel hub 15 can be separated from the front wheel axle 7 by removing the clamping assembly 6. At this time, the diesel engine transmission mechanism 2 drives the front wheel drive shaft 4 to rotate and drive the front wheel axle 7 to rotate. Under the action of the bearing 12, the hub disc 13 and the wheel hub 15 can rotate freely, thereby disengaging the front wheels of the tractor from the drive of the front wheel axle 7. At this time, the tractor is in a rear-wheel drive state, that is, the diesel engine transmission mechanism 2 drives the transmission shaft 3 to rotate and drive the rear wheels of the tractor to rotate, and the diesel engine transmission mechanism 2 drives the front wheel drive shaft 4 to rotate but does not drive the front wheels of the tractor to rotate. This embodiment switches the driving state of the tractor driven by the diesel engine transmission mechanism 2 by disassembling and assembling the clamping assembly 6. The existing diesel engine transmission mechanism can be directly used without the need to modify or replace the diesel engine transmission mechanism. The modification cost is low, and the tractor can be used in conjunction with different types of rotary tillage blade groups. The disassembly and assembly are convenient and the disassembly and assembly efficiency is high. When the tractor is traveling on a flat road, the clamping assembly 6 is installed between the front wheel axle 7 and the wheel hub 15 to put the tractor into a four-wheel drive state. The tractor travels smoothly and at a high speed. When the tractor crawls at a low speed on a road with a large slope, the clamping assembly 6 is removed to put the tractor into a rear-wheel drive state. The tractor has a strong climbing ability and high climbing efficiency.

[0029] In this embodiment, the connecting assembly 5 includes a connecting frame 501, a fixing rod 502, a sleeve 503, a pin 504, a locking nut a505, and a locking nut b506, wherein the connecting frame 501 is fixedly mounted on the diesel engine transmission mechanism 2, the fixing rod 502 is horizontally fixedly mounted on the tractor frame 8, and a sleeve 503 is vertically mounted on the front end of the fixing rod 502. The sleeve 503 is rotatably mounted on the connecting frame 501 through the pin 504. The sleeve 503 and the pin 504 are clearance-matched to facilitate steering the tractor through the handrail; the pin 504 is provided with a middle light The tractor 504 is composed of a shaft section 5041, an upper threaded section 5042, and a lower threaded section 5043. The intermediate optical shaft section 5041 is arranged inside the sleeve 503. The threads on the upper threaded section 5042 and the lower threaded section 5043 of the pin shaft 504 have opposite rotation directions, and the upper threaded section 5042 and the lower threaded section 5043 are respectively installed with a locking nut a505 and a locking nut b506, so that the pin shaft 504 can be axially limited by the locking nut a505 and the locking nut b506, which can effectively prevent the pin shaft 504 from loosening during the driving of the tractor, thereby effectively improving the driving stability of the tractor.

[0030] Preferably, the middle optical axis section 5041 of the pin shaft 504 passes through the upper and lower ends of the connecting frame 501, and a positioning plate 507 is provided between the middle optical axis section 5041 of the pin shaft 504 and the upper threaded section 5042, and a positioning groove 5011 matching the positioning plate 507 is provided at the upper end of the connecting frame 501, so that the axial position of the pin shaft 504 can be quickly positioned by the positioning plate 507, which can effectively improve the disassembly and assembly efficiency of the connecting component 5.

[0031] In this embodiment, the clamping assembly 6 includes at least two cross-arranged clamping plates 601 and a bearing pressure plate 602 installed on the inner side of the clamping plates 601. In this embodiment, two clamping plates 601 are preferably used, and the two clamping plates 601 are arranged in a "cross" shape. The clamping plates 601 are arranged in the clamping groove 700 of the front wheel axle 7. The middle position of the clamping plate 601 is detachably connected to the front wheel axle 7 by a locking bolt 604, and the outer end of the clamping plate 601 is detachably connected to the base 16 on the wheel hub 15 by a locking bolt 604, so that the clamping assembly 6 is detachably connected to the front wheel axle 7 and the wheel hub 15 through the locking bolt 604, so that the clamping assembly 6 can be detachably connected to the front wheel axle 7 and the wheel hub 15 through the locking bolt 604. 1 connects the front wheel shaft 7 and the wheel hub 15 as a whole. At this time, the diesel engine transmission mechanism 2 drives the front wheel drive shaft 4 to rotate, and the front wheel drive shaft 4 drives the front wheel shaft 7 to rotate. The front wheel shaft 7 drives the wheel hub 15 to rotate synchronously through the clamping plate 601. As a result, the tire installed on the wheel hub 15 rotates along with the wheel hub 15. At this time, the tractor is in a four-wheel drive state; the bearing pressure plate 602 is an annular plate that matches the outer ring of the bearing 12. After the clamping plate 601 is installed on the front wheel shaft 7, the bearing pressure plate 602 presses against the outer ring of the bearing 12, so that the bearing 12 can be axially positioned by the bearing pressure plate 602, ensuring the installation stability of the bearing 12 and thus ensuring the driving stability of the tractor.

[0032] Preferably, a columnar protrusion 603 is provided at the outer end of the clamping plate 601, and a locking bolt 604 is installed at the position of the columnar protrusion 603, so that the contact area between the clamping plate 601 and the base 16 can be increased through the columnar protrusion 603, thereby effectively improving the installation stability of the clamping plate 601 and the wheel hub 15.

[0033] In one embodiment, a bearing end cover 17 can also be installed at the installation position of the clamping assembly 6. The outer end of the front wheel axle 7 passes through the bearing end cover 17. The bearing end cover 17 is detachably connected to the base 16 on the wheel hub 15 by a locking bolt 604. Therefore, the wheel hub 15 can be disconnected from the front wheel axle 7 by replacing the clamping assembly 6 with the bearing end cover 17. At this time, the diesel engine transmission mechanism 2 drives the front wheel drive shaft 4 to rotate and drives the front wheel axle 7 to rotate. Under the action of the bearing 12, the hub disc 13 and the wheel hub 15 can rotate freely, so that the front wheels of the tractor are disconnected from the drive of the front wheel axle 7. At this time, the tractor is in the rear-wheel drive state. When the tractor needs to crawl at a low speed on a road with a larger slope, the clamping assembly 6 can be removed to put the tractor into the rear-wheel drive state, which can effectively improve the tractor's climbing ability and improve the climbing efficiency.

[0034] In one embodiment, the front wheel drive shaft 4 is a regular polygonal prism. In this embodiment, the front wheel drive shaft 4 preferably adopts a regular octagonal prism structure. The front wheel shaft 7 includes a regular polygonal prism section 701 and a cylindrical section 702. The inner end of the regular polygonal prism section 701 is provided with a hollow section 703, and the cross-sectional shape of the hollow section 703 matches the front wheel drive shaft 4. The front wheel shaft 7 is plugged into the front wheel drive shaft 4 through the hollow section 703, and the hollow section 703 of the front wheel shaft 7 is detachably connected to the front wheel drive shaft 4 through the latch a19 and the latch b20. The cross-sectional shape of the front wheel drive shaft 4 matches the knife shaft of the rotary tillage knife group, so that the front wheel drive shaft 4 can be detached by removing the latch a19 and the latch b20. Pin b20 removes the front wheel axle 7 and the front wheel of the tractor from the front wheel drive shaft 4. At the same time, the connecting assembly 5 and the cross-axis universal joint 18 are disassembled to separate the diesel engine transmission mechanism 2, the drive shaft 3, the front wheel drive shaft 4 and the tractor frame 8. The rotary blade group can be plugged into both ends of the front wheel drive shaft 4, and the diesel engine transmission mechanism 2 is used as the driving power of the rotary tiller. The front wheel drive shaft 4 is driven to rotate by the diesel engine transmission mechanism 2, and the front wheel drive shaft 4 drives the rotary blade group to rotate, thereby realizing the use of the diesel engine transmission mechanism 2 on the tractor for the rotary tiller to perform tillage operations, realizing multiple uses of one machine, effectively improving the application scope of the diesel engine transmission mechanism 2, and effectively reducing the procurement cost of agricultural machinery. Preferably, the latch a19 and the latch b20 are arranged vertically and crosswise, thereby effectively improving the connection stability between the front wheel drive shaft 4 and the front wheel shaft 7 and improving the transmission performance; preferably, the support frame 1 is respectively installed with a support rod a21 and a support rod b22 at the front and rear ends, so that when the diesel engine transmission mechanism 2 drives the rotary tiller group to form a rotary tiller, the diesel engine transmission mechanism 2 can be supported by adjusting the height or angle of the support rod a21 and the support rod b22 to ensure the stability of the rotary tiller.

[0035] The present invention enables the diesel engine transmission mechanism to be detachably connected to the tractor frame by installing a connecting assembly, enables the transmission shaft to be detachably connected to the rear wheel drive shaft by a cross-axis universal coupling, mounts the wheel hub on the front wheel shaft by a bearing, and installs a detachable clamping assembly between the front wheel shaft and the wheel hub, so that the front wheel shaft and the front wheel drive shaft are detachably connected, thereby enabling the diesel engine transmission mechanism to drive the tractor to switch between rear-wheel drive and four-wheel drive driving states by disassembling and assembling the clamping assembly, the disassembly and assembly is convenient, and the disassembly and assembly efficiency is high. The diesel engine transmission mechanism can be used as the driving power of the rotary tiller by disassembling and assembling the connecting assembly, the cross-axis universal coupling, and the front wheel shaft, and the existing diesel engine transmission mechanism can be directly used without the need to modify or replace the diesel engine transmission mechanism, thereby achieving multiple uses of one machine, effectively improving the application range of the diesel engine transmission mechanism, and effectively reducing the procurement cost of agricultural machinery.

[0036] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A field transporter transmission mechanism with a drive switching function, comprising a diesel engine transmission mechanism (2) mounted on a support frame (1), and a transmission shaft (3) and a front wheel drive shaft (4) drivingly connected to the diesel engine transmission mechanism (2), wherein the transmission shaft (3) and the front wheel drive shaft (4) are arranged perpendicularly and crosswise, and characterized in that: The diesel engine transmission mechanism (2) is detachably connected to the tractor frame (8) via a connecting assembly (5); the transmission shaft (3) is connected to the adapter shaft (10) via a coupling (9); the adapter shaft (10) is detachably connected to the rear wheel drive shaft (11); the rear wheel drive shaft (11) is connected to the rear axle of the tractor for driving the rear wheel to rotate; the front wheel drive shaft (4) is detachably connected to the front wheel shaft (7) at both ends; the outer end of the front wheel shaft (7) is mounted with a hub disc (13) via a bearing (12); A wheel hub (15) is detachably mounted on the hub plate (13) via bolts (14); a base (16) is fixedly mounted on the outer end of the wheel hub (15); the front wheel shaft (7) and the base (16) are detachably connected via a snap-fit assembly (6); a snap-fit groove (700) is provided on the outer end of the front wheel shaft (7) for facilitating the installation of the snap-fit assembly (6); after the snap-fit assembly (6) is installed between the front wheel shaft (7) and the base (16), the front wheel drive shaft (4) drives the wheel hub (15) to rotate synchronously via the front wheel shaft (7); The connecting assembly (5) comprises a connecting frame (501), a fixing rod (502), a sleeve (503), a pin (504), a locking nut a (505), and a locking nut b (506); the connecting frame (501) is fixedly mounted on the diesel engine transmission mechanism (2); the fixing rod (502) is horizontally fixedly mounted on the tractor frame (8); a sleeve (503) is vertically mounted on the front end of the fixing rod (502); the sleeve (503) is rotatably mounted on the connecting frame via the pin (504). On the frame (501), the pin shaft (504) consists of an intermediate optical axis section (5041), an upper threaded section (5042), and a lower threaded section (5043); the intermediate optical axis section (5041) is arranged inside the sleeve (503); the threads on the upper threaded section (5042) and the lower threaded section (5043) of the pin shaft (504) have opposite rotation directions, and the upper threaded section (5042) and the lower threaded section (5043) are respectively installed with a locking nut a (505) and a locking nut b (506); The clamping assembly (6) includes at least two cross-arranged clamping plates (601) and a bearing pressure plate (602) installed on the inner side of the clamping plate (601). The clamping plate (601) is arranged in the clamping groove (700) of the front wheel shaft (7). The middle position of the clamping plate (601) is detachably connected to the front wheel shaft (7) via a locking bolt (604). The outer end of the clamping plate (601) is detachably connected to the base (16) on the wheel hub (15) via a locking bolt (604). The bearing pressure plate (602) is an annular plate that matches the outer ring of the bearing (12). After the clamping plate (601) is installed on the front wheel shaft (7), the bearing pressure plate (602) presses against the outer ring of the bearing (12).

2. The field conveyor transmission mechanism with drive switching function according to claim 1, characterized in that: The middle optical axis section (5041) of the pin shaft (504) passes through the upper and lower ends of the connecting frame (501), and a positioning plate (507) is provided between the middle optical axis section (5041) of the pin shaft (504) and the upper threaded section (5042), and a positioning groove (5011) matching the positioning plate (507) is provided at the upper end of the connecting frame (501).

3. The field conveyor transmission mechanism with drive switching function according to claim 1, characterized in that: The outer end of the clamping plate (601) is provided with a columnar protrusion (603), and the locking bolt (604) is installed at the position of the columnar protrusion (603).

4. A field conveyor transmission mechanism with a drive switching function according to claim 1 or 3, characterized in that: A bearing end cover (17) is installed at the mounting position of the clamping assembly (6), the outer end of the front wheel axle (7) passes through the bearing end cover (17), and the bearing end cover (17) is detachably connected to the base (16) on the wheel hub (15) via a locking bolt (604).

5. The field conveyor transmission mechanism with drive switching function according to claim 4, characterized in that: The adapter shaft (10) and the rear wheel drive shaft (11) are detachably connected via a cross-shaft universal joint (18).

6. A field conveyor transmission mechanism with a drive switching function according to any one of claims 1 to 5, characterized in that: The front wheel drive shaft (4) is a regular polygonal prism, and the front wheel shaft (7) comprises a regular polygonal prism section (701) and a cylindrical section (702). The inner end of the regular polygonal prism section (701) is provided with a hollow section (703), and the cross-sectional shape of the hollow section (703) matches the front wheel drive shaft (4). The front wheel shaft (7) is plugged onto the front wheel drive shaft (4) through the hollow section (703), and the hollow section (703) of the front wheel shaft (7) and the front wheel drive shaft (4) are detachably connected through a latch a (19) and a latch b (20), and the latch a (19) and the latch b (20) are arranged in a vertically cross-staggered manner. The cross-sectional shape of the front wheel drive shaft (4) matches the knife shaft of the rotary tiller knife group.

7. The field conveyor transmission mechanism with drive switching function according to claim 6, characterized in that: A support rod a (21) and a support rod b (22) are respectively installed at the front and rear ends of the support frame (1).

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