Independent steering device of high-horsepower tractor

Abstract

The invention relates to the technical field of tractors, and discloses a high-horsepower tractor independent steering device which comprises an outer frame, a driving system and wheels, the outer frame comprises a T-shaped plate, a connecting plate, two vertical rods, two transverse rods, an upper horizontal rod and a lower horizontal rod, and one ends of the two transverse rods are arranged together with the left side and the right side of the front end of the T-shaped plate respectively; and the other ends of the two transverse rods are respectively arranged together with one ends of the corresponding vertical rods. By means of the outer frame, the driving system and the independent wheels, the device suitable for independent steering and turning of the medium and high horsepower tractors is designed, the turning radius of turning of the tractors is reduced, the technical problem that turning operation needs to be conducted continuously in the prior art is solved, and the field edge operation quality is improved; the device is installed on the front end face of the tractor, two front wheels of the original tractor are jacked up through the hydraulic cylinders, the independent wheels are driven by the hydraulic motor and the transmission shaft to conduct transverse steering, and in-situ turning of the tractor is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of tractors, and in particular relates to an independent steering device for a high-horsepower tractor. Background Art

[0002] Tractors are widely used in agricultural tillage and harvesting as farmland machines. Following the intensification of farmland, tractors now operate by traversing the field, requiring U-turns at the end of the field or at the edge of the field. Existing tractors require repeated, continuous steering of the steering wheel, using the tractor's steering axle, to perform U-turns. This operation results in a large turning radius for the tractor, negatively impacting work quality and tillage results at the edge of the field. Furthermore, the large turning radius reduces the tractor's efficiency in the field.

[0003] Therefore need to propose the high-horsepower tractor independent steering device urgently.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] In the prior art, tractors use a steering axle to achieve differential rotation of the inner and outer wheels. To address the problem that this U-turn method results in a large turning radius for the tractor and requires repeated steering wheel operation, which affects the tractor's operating efficiency, the basic concept of the technical solution adopted by the present invention is: An independent steering device for a high-horsepower tractor includes an outer frame, a drive system, and wheels. The outer frame includes a T-shaped plate, a connecting plate, two vertical rods, two transverse rods, an upper horizontal rod, and a lower horizontal rod. One end of the two transverse rods is respectively arranged with the left and right sides of the front end of the T-shaped plate, and the other end of the two transverse rods is respectively arranged with one end of the corresponding vertical rod. The upper horizontal rod and the lower horizontal rod are respectively arranged between the two vertical rods, and the connecting plate is arranged between the upper horizontal rod and the T-shaped plate. The drive system includes two hydraulic cylinders, a hydraulic motor, a reducer, a transmission shaft, a front plate, and a connecting plate. The rear end of the front plate is provided with front plate ears in the four directions of up, down, left, and right. An upper rotating rod is provided between the upper horizontal rod and the front plate, and a lower rotating rod is provided between the lower horizontal rod and the front plate. The two hydraulic cylinders are respectively provided between the T-shaped plate and the front plate. The connecting plate is placed between the wheels and the front plate. The transmission shaft includes a universal joint front shaft, a universal joint rear shaft, a three-pronged shaft front shaft, a three-pronged shaft rear shaft and a cross shaft. A U-shaped frame is installed on the upper end surface of the lower horizontal rod by bolts. The hydraulic motor is fixed to the U-shaped frame by bolts. The power output shaft of the hydraulic motor is connected to the input shaft of the reducer through a spline, and the outer shell of the reducer is fixed to the U-shaped frame by bolts.

[0006] As a preferred embodiment of the present invention, an annular through hole is provided on the back of the T-shaped plate; ear seats are provided on the left and right sides of the front end of the T-shaped plate, one end of the two transverse rods is connected to the T-shaped plate through the ear seat, one end of the two transverse rods is provided with a through hole, the inner walls of the two ear seats are provided with a key groove, the through hole of the transverse rod and the key groove of the ear seat are equipped with a spline shaft, and the spline shaft passes through the through hole of the ear seat and the transverse rod for installation and connection; the other end of the two transverse rods is also provided with a through hole, and the lower inner wall of the two vertical rods is provided with a threaded hole, and the other end of the two transverse rods and the corresponding vertical rods are fixedly connected by two bolts, which pass through the through hole of the outer wall of the lower end of the vertical rod and are threadedly connected to the threaded hole on the inner wall of the vertical rod; the upper horizontal rod is installed between the upper ends of the two vertical rods by bolts, and the lower horizontal rod is installed between the lower ends of the two vertical rods by bolts.

[0007] As a preferred embodiment of the present invention, inner ear seats are respectively provided on the left and right inner sides of the upper end of the T-shaped plate, an upper horizontal ear seat is provided in the middle of the lower end of the upper horizontal rod, and a lower horizontal ear seat is provided in the middle of the front end of the lower horizontal rod.

[0008] As a preferred embodiment of the present invention, through holes are provided at the front and rear ends of the upper rotating rod, and the front end of the upper rotating rod is connected to the front plate ear seat by a pin shaft, and the two form a rotating pair; the rear end of the upper rotating rod is connected to the upper horizontal ear seat by a pin shaft, and the two form a rotating pair; the front and rear ends of the lower rotating rod are provided with through holes, and the front end of the lower rotating rod is connected to the front plate ear seat by a pin shaft, and the two form a rotating pair; the rear end of the lower rotating rod is connected to the lower horizontal ear seat by a pin shaft, and the two form a rotating pair; the rear end of the hydraulic cylinder is installed on the inner ear seat, and the rear end of the hydraulic cylinder is connected to the inner ear seat by a pin shaft, and the two form a rotating pair; the front ends of the two hydraulic cylinders are respectively installed on the front plate ear seats on the left and right sides of the front plate, and the front ends of the two hydraulic cylinders are connected to the front plate ear seats on the left and right sides by pin shafts, and the two form a rotating pair.

[0009] As a preferred embodiment of the present invention, the reducer is a planetary gear reducer, and the output shaft of the reducer transmits torque to the front shaft of the universal joint through a spline; the front shaft of the universal joint and the rear shaft of the universal joint are connected by a cross shaft; three radial shafts are provided in the radial direction of the end of the front shaft of the tripod shaft, and rollers are installed on the shaft bodies of the radial shafts, the lower ends of the rollers are limited by shaft shoulders, and the upper ends of the rollers are limited by retaining rings. The rollers are special bearings, and the outer end faces of the rollers are arc-shaped, wide in the middle and narrow at both ends.

[0010] As a preferred embodiment of the present invention, the three-pronged shaft front axle is inserted into the three-pronged shaft rear axle, and three open grooves are provided on the hollow shaft body of the three-pronged shaft rear axle, and the upper and lower inner walls of the open grooves are arc-shaped, and the rotor fits in the open grooves; the end of the three-pronged shaft rear axle is connected to the rear end of the connecting plate through a keyway and a key and transmits torque; the front end of the three-pronged shaft front axle is provided with an internal spline, and the universal joint rear axle is provided with an external spline of the same specification, and the three-pronged shaft front axle and the universal joint rear axle are connected by splines.

[0011] As a preferred embodiment of the present invention, the rear end of the connecting disk is provided with a connecting shaft body, a threaded keyway and a step, a groove is opened in the middle of the front plate, the connecting shaft body passes through the groove in the middle of the front plate, the outer wall of the connecting shaft body is installed with a deep groove ball bearing and a thrust ball bearing, and the connecting shaft body is placed in the groove in the middle of the front plate after the deep groove ball bearing and the thrust ball bearing are installed; a step is provided on the connecting disk, the end face of the step contacts the front end face of the front plate, the rear end of the connecting disk is provided with a thread, and a locking nut is assembled on the thread at the rear end of the connecting disk, the left end face of the locking nut presses the thrust ball bearing and contacts with the rear end face of the groove in the middle of the front plate, and the step and the locking nut limit the axial position of the connecting shaft body.

[0012] As a preferred embodiment of the present invention, the threaded keyway is opened on the rear end of the connecting disk, the threaded keyway on the rear axle of the three-pronged shaft and the connecting shaft body are assembled together through a key, and the torque is transmitted between the rear axle of the three-pronged shaft and the connecting disk through the threaded keyway and key set on the connecting shaft body; a through hole is opened on the end face of the connecting disk, and the through hole at the rim of the wheel and the through hole on the connecting disk are connected by bolts and nuts.

[0013] As a preferred embodiment of the present invention, the T-shaped plate and the upper horizontal rod are connected by a connecting plate, the connecting plate is provided with a rectangular through hole, the connecting plate and the T-shaped plate are connected by bolts, and the connecting plate and the upper horizontal rod are connected by bolts; the T-shaped plate and the tractor are connected by bolts.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention utilizes an external frame, a drive system, and independent wheels to design a device suitable for independent steering and U-turning of medium- and high-horsepower tractors. This reduces the turning radius of the tractor's U-turn, solves the technical problem of the prior art requiring continuous U-turn operations, and improves the quality of field operations. The present invention is installed on the front face of the tractor, uses a hydraulic cylinder to lift the two front wheels of the original tractor, and uses a hydraulic motor and drive shaft to drive the independent wheels for lateral steering, thereby achieving a U-turn of the tractor on the spot.

[0015] 2. The present invention can be installed on the front end of a tractor and used as a counterweight. Moreover, the present invention can be installed on tractors of different horsepower segments as an independent steering and turning device, and has strong practicality.

[0016] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In the attached figure: Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 Schematic diagram of the transmission mode of the drive system of the present invention; Figure 3 This is a schematic diagram of the outer frame structure of the present invention; Figure 4 This is a schematic diagram of the structure of the connection plate installation method of the present invention; Figure 5 Schematic diagram of the drive system structure of the present invention; Figure 6 It is a schematic diagram of the structure of the three-pronged transmission shaft of the present invention.

[0018] Figure 7 It is a schematic diagram of the connection disk structure of the present invention.

[0019] In the figure: 1. Outer frame; 11. T-plate; 111. Ear seat; 112. Annular through hole; 113. Inner ear seat; 12. Connecting plate; 13. Vertical rod; 14. Transverse rod; 15. Upper horizontal rod; 151. Upper rotating rod; 152. Upper horizontal ear seat; 16. Lower horizontal rod; 161. Lower rotating rod; 162. Lower horizontal ear seat; 2. Drive system; 21. Hydraulic cylinder; 22. Hydraulic motor; 23. Reducer; 231. U-shaped frame; 24. Transmission 3. Wheel; 241. Universal joint front axle; 242. Universal joint rear axle; 243. Three-pronged shaft front axle; 2431. Radial shaft; 2432. Roller; 244. Three-pronged shaft rear axle; 2441. Open groove; 245. Cross shaft; 25. Front plate; 251. Front plate ear seat; 252. Thrust ball bearing; 253. Locking nut; 254. Deep groove ball bearing; 26. Connecting plate; 261. Connecting shaft body; 262. Threaded keyway; 263. Step; 3. Wheel. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention.

[0021] like Figure 1 、 Figure 2 、 Figure 3 and Figure 4As shown, the independent steering system for high-horsepower tractors includes an outer frame 1, a drive system 2, and wheels 3. The outer frame 1 comprises a T-shaped plate 11, a connecting plate 12, two vertical rods 13, two transverse rods 14, an upper horizontal rod 15, and a lower horizontal rod 16. One end of each transverse rod 14 is attached to the left and right sides of the front end of the T-shaped plate 11, while the other end of each transverse rod 14 is attached to one end of the corresponding vertical rod 13. The upper horizontal rod 15 and the lower horizontal rod 16 are respectively disposed between the two vertical rods 13, and the connecting plate 12 is disposed between the upper horizontal rod 15 and the T-shaped plate 11.

[0022] Specifically, the back of the T-shaped plate 11 is provided with an annular through-hole 112, and the left and right sides of the front end of the T-shaped plate 11 are provided with ear seats 111, and the left and right inner sides of the upper end are respectively provided with inner ear seats 113. Two transverse rods 14 and two vertical rods 13 are distributed on both sides of the T-shaped plate 11. The left and right sides of the front end of the T-shaped plate 11 are provided with ear seats 111. The transverse rods 14 and the T-shaped plate 11 are connected by the ear seats 111. One end of the two transverse rods 14 has a through-hole, and the inner walls of the two ear seats 111 are provided with a keyway. The through-holes of the transverse rods 14 and the keyways of the ear seats 111 are equipped with spline shafts, which pass through the through-holes of the ear seats 111 and the through-holes at the ends of the transverse rods 14 for installation and connection.

[0023] The other ends of the two horizontal rods 14 are also provided with through holes, and the lower inner walls of the two vertical rods 13 are provided with threaded holes. The other ends of the two horizontal rods 14 and the corresponding vertical rods 13 are fixedly connected by two bolts. The bolts pass through the through holes in the outer wall of the lower end of the vertical rod 13 and are threadedly connected to the threaded holes on the inner wall of the vertical rod 13.

[0024] The upper horizontal rod 15 is bolted between the upper ends of the two vertical rods 13, and the lower horizontal rod 16 is bolted between the lower ends of the two vertical rods 13. The T-shaped plate 11 is provided with inner ear seats 113 on the left and right inner sides of the upper end, an upper horizontal ear seat 152 is provided in the middle of the lower end of the upper horizontal rod 15, and a lower horizontal ear seat 162 is provided in the middle of the front end of the lower horizontal rod 16.

[0025] like Figure 1 、 Figure 2 and Figure 3 and Figure 4As shown, the independent steering system for a high-horsepower tractor comprises a drive system 2 comprising a hydraulic cylinder 21, a hydraulic motor 22, a reducer 23, a drive shaft 24, a front plate 25, and a connecting plate 26. The rear end of the front plate 25 is provided with front plate lugs 251 in the four directions, top, bottom, left, and right. The upper horizontal rod 15 and the front plate 25 are connected by an upper rotating rod 151. The upper rotating rod 151 has through-holes at its front and rear ends. The front end of the upper rotating rod 151 is connected to the front plate lugs 251 via a pin, forming a revolving pair. The rear end of the upper rotating rod 151 is connected to the upper horizontal lug 152 via a pin, forming a revolving pair. The lower horizontal rod 16 and the front plate 25 are connected by a lower rotating rod 161. The lower rotating rod 161 has through-holes at its front and rear ends. The front end of the lower rotating rod 161 is connected to the front plate lugs 251 via a pin, forming a revolving pair. The rear end of the lower rotating rod 161 is connected to the lower horizontal lug 162 via a pin, forming a revolving pair. The two hydraulic cylinders 21 are distributed on both sides of the drive system 2. The rear end of the hydraulic cylinder 21 is installed on the inner ear seat 113 and is connected to the inner ear seat 113 through a pin shaft. The two form a rotating pair; the front ends of the two hydraulic cylinders 21 are respectively installed on the front plate ear seats 251 on the left and right sides of the front plate 25 and are connected to the front plate ear seats 251 on the left and right sides through a pin shaft. The front ends of the two hydraulic cylinders 21 and the front plate ear seats 251 on the left and right sides respectively form a rotating pair.

[0026] like Figure 1 、 Figure 4 、 Figure 5 and Figure 6 As shown, the independent steering system for a high-horsepower tractor comprises a drive shaft 24 comprising a universal joint front axle 241, a universal joint rear axle 242, a three-pronged front axle 243, a three-pronged rear axle 244, and a cross shaft 245. A U-shaped bracket 231 is bolted to the upper end surface of the lower horizontal bar 16. The hydraulic motor 22 is bolted to the U-shaped bracket 231, and the lower end of the U-shaped bracket 231 is bolted to the upper end surface of the lower horizontal bar 16. The power output shaft of the hydraulic motor 22 is splined to the input shaft of the reducer 23, and the reducer housing is bolted to the U-shaped bracket 231.

[0027] The reducer 23 is a planetary gear reducer. The sun gear of the planetary gear reducer is spline-connected to the power output shaft of the hydraulic motor 22. The output shaft of the reducer 23 is the planetary carrier of the planetary gear reducer. The outer ring gear of the planetary gear reducer is fixedly connected to the outer shell of the reducer 23. The output shaft of the reducer 23 transmits torque to the universal joint front shaft 241 through splines. The universal joint front shaft 241 and the universal joint rear shaft 242 are connected by a cross shaft 245. Three radial shafts 2431 are provided in the radial direction at the end of the three-pronged shaft front shaft 243. The shaft bodies of the radial shafts 2431 are equipped with rollers 2432. The lower ends of the rollers 2432 are limited by shaft shoulders, and the upper ends of the rollers 2432 are limited by retaining rings. The rollers 2432 are specially made bearings, and the outer end faces of the rollers 2432 are arc-shaped with a wide middle and narrow ends. The three-pronged front axle 243 is inserted into the three-pronged rear axle 244. The hollow shaft of the three-pronged rear axle 244 is provided with three open slots 2441, with the upper and lower inner walls of the slots 2441 being curved. The rotor 2432 fits within the slots 2441. The end of the three-pronged rear axle 244 is connected to the rear end of the connecting plate 26 via a keyway and key, transmitting torque. The front end of the three-pronged front axle 243 is provided with an internal spline, and the universal joint rear axle 242 is provided with an external spline of the same specification. The three-pronged front axle 243 and the universal joint rear axle 242 are connected via a spline.

[0028] like Figure 1 、 Figure 4 and Figure 5 As shown, the independent steering device of a high-horsepower tractor, the connecting plate 26 is placed between the wheel 3 and the front plate 25, the rear end of the connecting plate 26 is provided with a connecting shaft body 261, a threaded keyway 262 and a step 263, the middle of the front plate 25 is provided with a groove, the connecting shaft body 261 passes through the groove in the middle of the front plate 25, the outer wall of the connecting shaft body 261 is installed with a deep groove ball bearing 254 and a thrust ball bearing 252, the connecting shaft body 261 is installed with the deep groove ball bearing 254 and the thrust ball bearing 252 and then placed in the groove in the middle of the front plate 25, a step 263 is provided on the connecting plate 26, the end face of the step 263 contacts the front end face of the front plate 25, the rear end of the connecting plate 26 is provided with a thread, the thread at the rear end of the connecting plate 26 is assembled with a locking nut 253, and the locking nut 253 fits on the thread at the rear end of the connecting plate 26. The left end face of the locking nut 253 presses the thrust ball bearing 252 and contacts the rear end face of the middle groove of the front plate 25, axially limiting the connecting shaft body 261 through the step 263 and the locking nut 253. The threaded keyway 262 is provided on the rear end of the connecting plate 26. The three-pronged shaft rear axle 244 and the threaded keyway 262 on the connecting shaft body 261 are assembled together via a key. Torque is transmitted between the three-pronged shaft rear axle 244 and the connecting plate 26 via the threaded keyway 262 and the key provided on the connecting shaft body 261.

[0029] like Figure 1 、 Figure 5 and Figure 7 As shown, the independent steering device for a high-horsepower tractor has a through-hole formed on the end surface of the connecting plate 26. The through-holes on the rim of the wheel 3 and the through-holes on the connecting plate 26 are connected by bolts and nuts. The T-plate 11 and the upper horizontal rod 15 are connected by a connecting plate 12, which has rectangular through-holes. The connecting plate 12 is bolted to the T-plate 11, the connecting plate 12 is bolted to the upper horizontal rod 15, and the T-plate 11 is bolted to the tractor.

[0030] When in use, the hydraulic motor 22 is fed with hydraulic oil, which converts pressure energy into mechanical energy. The torque output by the hydraulic motor 22 is decelerated and increased by the reducer 23, and then transmitted to the transmission shaft 24. The transmission shaft 24 then transmits the power to the connecting plate 26, which drives the wheels 3 to rotate. The forward and reverse rotation of the hydraulic motor 22 drives the forward and reverse rotation of the wheels 3.

[0031] During use, the present invention is mounted at a suitable height on the front face of a tractor via the T-plate 11. When the left and right hydraulic cylinders 21 extend outward, the front plate 25 drives the connecting plate 26 and the wheel 3 downward relative to the tractor's front face. When the left and right hydraulic cylinders 21 retract inward, the front plate 25 drives the connecting plate 26 and the wheel 3 upward relative to the tractor's front face. During the process of raising and lowering the wheel 3 relative to the tractor's front face, the left end of the universal joint rear axle 242 extends and retracts within the three-pronged front axle 243, and the universal joint rear axle 242 rotates relative to the cross axle 245, and the rotor 2432 rotates relative to the open slot 2441 to accommodate the change in the vertical angle of the front plate 25 relative to the T-plate 11. When wheel 3 descends relative to the tractor's front end until it touches the ground, it continues to descend, lifting the tractor's two front wheels. The hydraulic motor 22 then outputs torque, which is then decelerated and amplified to drive wheel 3. The tractor's rear axle no longer outputs power, and the tractor's rear wheels, acting in conjunction with wheel 3 under the action of the central differential, steer the tractor along its longitudinal axis, thus enabling a U-turn on the spot. Once the U-turn is complete, the two hydraulic cylinders 21 retract inward until wheel 3 leaves the ground, and the tractor's two front wheels resume contact with the ground.

[0032] It will be understood that the present invention is described by way of some embodiments, and it will be appreciated by those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be protected by the present invention.

Claims

1. An independent steering device for a high-horsepower tractor, comprising an outer frame (1), a drive system (2) and wheels (3), characterized in that: The outer frame (1) comprises a T-shaped plate (11), a connecting plate (12), two vertical rods (13), two transverse rods (14), an upper horizontal rod (15) and a lower horizontal rod (16), one end of the two transverse rods (14) being respectively arranged together with the left and right sides of the front end of the T-shaped plate (11), and the other ends of the two transverse rods (14) being respectively arranged together with one end of the corresponding vertical rod (13); the upper horizontal rod (15) and the lower horizontal rod (16) being respectively arranged between the two vertical rods (13), and the connecting plate (12) being arranged between the upper horizontal rod (15) and the T-shaped plate (11); The driving system (2) comprises two hydraulic cylinders (21), a hydraulic motor (22), a speed reducer (23), a transmission shaft (24), a front plate (25) and a connecting plate (26); the rear end of the front plate (25) is provided with front plate ear seats (251) in four directions, namely, up, down, left and right; an upper rotating rod (151) is provided between the upper horizontal rod (15) and the front plate (25); a lower rotating rod (161) is provided between the lower horizontal rod (16) and the front plate (25); the two hydraulic cylinders (21) are respectively provided between the T-shaped plate (11) and the front plate (25); the connecting plate (26) is placed between the wheel (3) and the front plate (25); The transmission shaft (24) includes a universal joint front shaft (241), a universal joint rear shaft (242), a three-pronged shaft front shaft (243), a three-pronged shaft rear shaft (244) and a cross shaft (245). A U-shaped frame (231) is mounted on the upper end surface of the lower horizontal rod (16) by bolts. The hydraulic motor (22) is fixed to the U-shaped frame (231) by bolts. The power output shaft of the hydraulic motor (22) is connected to the input shaft of the reducer (23) by splines. The housing of the reducer (23) is fixed to the U-shaped frame (231) by bolts.

2. The independent steering device for high-horsepower tractors according to claim 1, characterized in that: The back of the T-shaped plate (11) is provided with an annular through hole (112); the left and right sides of the front end of the T-shaped plate (11) are provided with ear seats (111); one end of the two transverse rods (14) is connected to the T-shaped plate (11) through the ear seats (111); one end of the two transverse rods (14) is provided with a through hole; the inner walls of the two ear seats (111) are provided with a key groove; a spline shaft is assembled in the through hole of the transverse rod (14) and the key groove of the ear seat (111); the spline shaft passes through the through hole of the ear seat (111) and the transverse rod (14) for installation and connection; The other ends of the two transverse rods (14) are also provided with through holes, and the lower inner side walls of the two vertical rods (13) are provided with threaded holes. The other ends of the two transverse rods (14) and the corresponding vertical rods (13) are fixedly connected by two bolts, and the bolts pass through the through holes in the outer wall of the lower end of the vertical rod (13) and are threadedly connected with the threaded holes in the inner wall of the vertical rod (13); the upper horizontal rod (15) is installed between the upper ends of the two vertical rods (13) by bolts, and the lower horizontal rod (16) is installed between the lower ends of the two vertical rods (13) by bolts.

3. The independent steering device for high-horsepower tractors according to claim 2, characterized in that: The inner sides of the left and right upper ends of the T-shaped plate (11) are respectively provided with inner ear seats (113), the middle portion of the lower end of the upper horizontal rod (15) is provided with an upper horizontal ear seat (152), and the middle portion of the front end of the lower horizontal rod (16) is provided with a lower horizontal ear seat (162).

4. The independent steering device for high-horsepower tractors according to claim 3, characterized in that: The front and rear ends of the upper rotating rod (151) are provided with through holes, the front end of the upper rotating rod (151) and the front plate ear seat (251) are connected by a pin shaft, and the two form a rotating pair; the rear end of the upper rotating rod (151) and the upper horizontal ear seat (152) are connected by a pin shaft, and the two form a rotating pair; the front and rear ends of the lower rotating rod (161) are provided with through holes, the front end of the lower rotating rod (161) and the front plate ear seat (251) are connected by a pin shaft, and the two form a rotating pair; The rear end is connected to the lower horizontal ear seat (162) via a pin shaft, and the two form a rotation pair; the rear end of the hydraulic cylinder (21) is installed on the inner ear seat (113), and the rear end of the hydraulic cylinder (21) is connected to the inner ear seat (113) via a pin shaft, and the two form a rotation pair; the front ends of the two hydraulic cylinders (21) are respectively installed on the front plate ear seats (251) on the left and right sides of the front plate (25), and the front ends of the two hydraulic cylinders (21) are connected to the front plate ear seats (251) on the left and right sides via a pin shaft, and the two form a rotation pair.

5. The independent steering device for high-horsepower tractors according to claim 1, characterized in that: The reducer (23) is a planetary gear reducer, and the sun gear of the planetary gear reducer is connected to the power output shaft of the hydraulic motor (22) via a spline; the output shaft of the reducer (23) and the universal joint front shaft (241) transmit torque via a spline; the universal joint front shaft (241) and the universal joint rear shaft (242) are connected via a cross shaft (245); three radial shafts (2431) are provided in the radial direction of the end of the three-pronged shaft front shaft (243), and rollers (2432) are assembled on the shaft bodies of the radial shafts (2431), the lower ends of the rollers (2432) are limited by shaft shoulders, and the upper ends of the rollers (2432) are limited by snap rings, and the outer end surfaces of the rollers (2432) are in the shape of an arc with a wide middle and narrow ends.

6. The independent steering device for high-horsepower tractors according to claim 5, characterized in that: The three-pronged shaft front shaft (243) is inserted into the three-pronged shaft rear shaft (244); the hollow shaft body of the three-pronged shaft rear shaft (244) is provided with three open slots (2441); the upper and lower inner walls of the open slots (2441) are arc-shaped; the rotor (2432) fits in the open slots (2441); the end of the three-pronged shaft rear shaft (244) is connected to the rear end of the connecting plate (26) through a keyway and a key to transmit torque; the front end of the three-pronged shaft front shaft (243) is provided with an internal spline, and the universal joint rear shaft (242) is provided with an external spline of the same specification; the three-pronged shaft front shaft (243) and the universal joint rear shaft (242) are connected through a spline.

7. The independent steering device for a high-horsepower tractor according to claim 1, characterized in that: The rear end of the connecting plate (26) is provided with a connecting shaft body (261), a threaded keyway (262) and a step (263). A groove is provided in the middle of the front plate (25). The connecting shaft body (261) passes through the groove in the middle of the front plate (25). A deep groove ball bearing (254) and a thrust ball bearing (252) are installed on the outer wall of the connecting shaft body (261). The connecting shaft body (261) is installed with the deep groove ball bearing (254) and the thrust ball bearing (252) and is then placed in the middle of the front plate (25). The connecting plate (26) is provided with a step (263), the end face of the step (263) contacts the front end face of the front plate (25), the rear end of the connecting plate (26) is provided with a thread, and a locking nut (253) is assembled on the thread of the rear end of the connecting plate (26), the left end face of the locking nut (253) presses the thrust ball bearing (252) and contacts the rear end face of the middle groove of the front plate (25), and the step (263) and the locking nut (253) axially limit the connecting shaft body (261).

8. The independent steering device for high-horsepower tractors according to claim 7, characterized in that: The threaded keyway (262) is provided on the rear end of the connecting disk (26); the three-pronged shaft rear axle (244) and the threaded keyway (262) on the connecting shaft body (261) are assembled together via a key; torque is transmitted between the three-pronged shaft rear axle (244) and the connecting disk (26) via the threaded keyway (262) and the key provided on the connecting shaft body (261); a through hole is provided on the end surface of the connecting disk (26); the through hole at the rim of the wheel (3) and the through hole on the connecting disk (26) are connected via bolts and nuts.

9. The independent steering device for a high-horsepower tractor according to claim 7, characterized in that: The T-shaped plate (11) and the upper horizontal rod (15) are connected via a connecting plate (12), a rectangular through hole is provided on the connecting plate (12), the connecting plate (12) and the T-shaped plate (11) are connected via bolts, and the connecting plate (12) and the upper horizontal rod (15) are connected via bolts.

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