Wheeled agricultural vehicle same-track steering system

Abstract

This invention relates to the field of agricultural mechanization technology, specifically to a same-track steering system for wheeled agricultural vehicles. The system includes a frame with connecting columns rotatably connected to both ends. A crossbeam is fixed to the bottom surface of each connecting column, and a positioning tube is fixed to both ends of the bottom surface of each crossbeam. A support column is rotatably connected to one end of each positioning tube, and a drive wheel is rotatably connected to the bottom end of each support column. An adjusting shaft is rotatably connected inside each positioning tube, and one end of the adjusting shaft is slidably engaged with a connecting shaft fixedly connected to a corresponding support column. In this invention, both solenoid valves are de-energized, and the steering locking mechanism locks the connecting columns after completion, achieving steering only for the front wheels. Through same-track steering, same-phase steering, and front-wheel steering of the agricultural vehicle frame, this system is suitable for applications in confined terrain and narrow-area soybean-corn intercropping planting patterns, thus improving the applicability of the agricultural vehicle chassis.

Description

Technical Field

[0001] This invention relates to the field of agricultural mechanization technology, specifically to a same-track steering system for wheeled agricultural vehicles. Background Technology

[0002] Same-track steering refers to the alignment of the midpoints of the rear and front axles when a farm vehicle turns (or, when turning in opposite phases, the front and rear wheels travel on the same track). Traditional two-wheel steering farm vehicle chassis suffer from problems such as large turning radius, poor maneuverability, and potential damage to crops when the front and rear wheels are not aligned when operating in narrow terrain or in intercropping patterns of soybeans and corn. This makes it difficult to meet the requirements of same-track steering and narrow-area operation, thus limiting the applicability of the farm vehicle chassis. Furthermore, when a drive wheel of the farm vehicle gets stuck in the mud, it is not easy to move it out of the depression by adjusting its position. The height of crops varies at different growth stages, and most farm vehicle chassis cannot easily adjust their height to move over crops at different heights. When the crop height is low and the farm vehicle chassis is high off the ground, pesticides on the farm vehicle may not be able to reach the crops (taking pesticide spraying as an example). Conversely, when the crop height is high and the farm vehicle chassis is low off the ground, the chassis may come into contact with the crops, damaging them. Summary of the Invention

[0003] To overcome the aforementioned technical problems, the present invention aims to provide a same-track steering system for wheeled agricultural vehicles. This system controls the engagement (disengagement) and disengagement (engagement) of drive shaft one, driven shaft one, drive shaft two, and driven shaft two via energization (de-energization) of electromagnetic clutch one and de-energization (energization) of electromagnetic clutch two, enabling switching between same-track steering and same-phase steering. With both solenoid valves de-energized, the steering locking component can be completed and the connecting column locked, achieving steering only for the front wheels. This system, utilizing same-track steering, same-phase steering, and front-wheel steering on the agricultural vehicle frame, is suitable for applications in confined terrain and narrow-area soybean-corn intercropping planting patterns, thus expanding the applicability of the agricultural vehicle chassis.

[0004] The objective of this invention can be achieved through the following technical solutions:

[0005] A wheeled agricultural vehicle's same-track steering system includes a frame. Connecting columns are rotatably connected to both ends of the frame. A crossbeam is fixed to the bottom surface of each connecting column. Positioning tubes are fixed to both ends of the bottom surface of each crossbeam. A support column is rotatably connected to one end of each positioning tube. A drive wheel is rotatably connected to the bottom end of each support column. An adjusting shaft is rotatably connected inside each positioning tube. One end of the adjusting shaft is slidably engaged with a connecting shaft fixedly connected to a corresponding support column. A transmission shaft for driving the adjusting shaft is rotatably connected between the two positioning tubes. A transmission component is provided at the top of one connecting column, and a positioning shaft is fixed to the top of the other connecting column. The transmission component includes a linkage shaft fixedly connected to the corresponding connecting column. A driven gear is fixed at the top of shaft one, an electromagnetic clutch is installed in the middle of the linkage shaft one, a driven gear is fixed at the bottom of the linkage shaft one, a transmission component two is provided on the outside of the transmission component one, the transmission component two includes a linkage shaft two that is rotatably connected to the frame, a driving gear one that meshes with the driven gear is fixed at the top of the linkage shaft two, an electromagnetic clutch two is installed in the middle of the linkage shaft two, a driving gear two is fixed at the bottom of the linkage shaft two, a driven gear three is fixed at the top of the positioning shaft, a driving gear three that meshes with the outside of the driven gear three, a linkage mechanism is connected between the driving gear three and the driving gear one, and a steering switching component for driving the positioning shaft to rotate is provided at one end of the top of the frame.

[0006] Furthermore, the positioning tube has an internal cylindrical cavity and a hexagonal cavity that are interconnected. A hexagonal block is fixed at the end of the adjusting shaft away from the connecting shaft. A hexagonal slot is provided at the end of the adjusting shaft near the hexagonal block. Both ends of the transmission shaft are fixed with hexagonal shafts that are movably inserted into the corresponding hexagonal slots.

[0007] Furthermore, one end of the adjusting shaft is provided with a circular hole that is slidably connected to the connecting shaft, a locking block is fixed inside the circular hole, a locking groove is provided on the outside of the connecting shaft that is slidably connected to the locking block, and a rectangular through hole is provided on the outside of the positioning tube.

[0008] Furthermore, a second worm gear is fixedly sleeved on the outer side of the drive shaft, a housing is fixed at the bottom of the crossbeam, a motor is fixed inside the housing, a second worm gear that meshes with the second worm gear is fixed at the output end of the motor, an annular track is fixed on the bottom surface at both ends of the frame, and bearings that are rolledly connected to the annular track are fixed at both ends of the top surface of the crossbeam.

[0009] Furthermore, the linkage mechanism includes a shaft one, one end of which is rotatably connected to a nut, and the inner side of the nut is screwed onto a shaft two that is slidably inserted into the shaft one. Both shaft one and shaft two are rotatably connected to connecting rods at opposite ends. One of the connecting rods is fixedly connected to a driving gear three, and the other connecting rod is fixedly connected to a driving gear one.

[0010] Furthermore, a worm gear is fixed to the bottom of the positioning shaft, a connecting seat is fixed to one end of the frame, and a worm is rotatably connected inside the connecting seat to mesh with the worm gear. The worm is connected to the steering switching component.

[0011] Furthermore, the steering switching component includes a steering shaft one and a steering shaft two, which are rotatably connected by a universal joint. A bevel gear one is fixed to the end of the steering shaft one that is away from the universal joint, and a bevel gear two that meshes with and drives the bevel gear one is fixed to one end of the worm gear one. A steering wheel is fixed to the top of the steering shaft two.

[0012] Furthermore, a steering locking component is fixed to the bottom surface of one end of the vehicle frame. The steering locking component includes a connecting block that is fixedly connected to the vehicle frame. A cylinder is fixed to the outside of the connecting block. A locking block that is movably inserted into the corresponding connecting post is fixed to the output end of the cylinder.

[0013] Furthermore, the first linkage shaft includes a first driving shaft and a first driven shaft, and the first electromagnetic clutch is located between the first driving shaft and the first driven shaft; the second linkage shaft includes a second driving shaft and a second driven shaft, and the second electromagnetic clutch is located between the second driving shaft and the second driven shaft.

[0014] Furthermore, the middle of the driving gear three is rotatably connected to a support shaft one that is fixedly connected to the frame, one end of the frame is fixed to a support shaft two, the top end of the support shaft two is rotatably connected to an idler wheel, the driven gear two and the driving gear two are both meshed with the idler wheel for transmission, the bottom end of the support column is fixed to a hydraulic motor, and the output end of the hydraulic motor is fixedly connected to the corresponding drive wheel.

[0015] The beneficial effects of this invention are:

[0016] 1. By turning the steering wheel clockwise, steering shaft one and steering shaft two rotate, causing worm gear one to rotate. Worm gear one rotates, causing driven gear three to rotate clockwise. This causes the crossbeam at the bottom of the positioning shaft to rotate clockwise, along with the drive wheels on the two support columns. Simultaneously, driven gear three rotates counterclockwise, causing drive gear three to rotate instantaneously under the pushing action of shaft one and shaft two. At this moment, electromagnetic clutch two is de-energized, disengaging drive shaft two and driven shaft two on linkage shaft two. Electromagnetic clutch one is energized, engaging drive shaft one and driven shaft one on linkage shaft one. This causes drive gear one to rotate counterclockwise, along with driven gear one. Drive gear one, through linkage shaft one, rotates counterclockwise, along with the connecting column below it. This causes the crossbeam below linkage shaft one to rotate counterclockwise, along with the drive wheel, thus achieving same-track steering for the agricultural vehicle (refer to the instruction manual). Figure 13 Similarly, when the steering wheel is turned clockwise to make the two front wheels turn clockwise, the electromagnetic clutch 2 is energized to engage the drive shaft 2 and the driven shaft 2, and the electromagnetic clutch 1 is de-energized to disengage the drive shaft 1 and the driven shaft 1. This causes the drive gear 1 to rotate clockwise synchronously through the linkage shaft 2, and the driven gear 2 rotates clockwise under the meshing transmission of the idler gear. This causes the crossbeam below the linkage shaft 1 to rotate the drive wheel clockwise, realizing the same-phase steering of the agricultural vehicle. The locking block is inserted into the corresponding position of the connecting column through the output end of the cylinder to lock and fix the connecting column. At the same time, the electromagnetic clutch 1 and the electromagnetic clutch 2 are de-energized, so that when the front wheels rotate in different directions, the direction and position of the rear wheels remain unchanged, realizing the independent steering movement of the front wheels. Through the same-track steering, same-phase steering, and independent steering of the front wheels of the agricultural vehicle chassis, it is suitable for applications in conditions such as narrow terrain and narrow-width soybean-corn intercropping planting mode, which improves the applicability of the agricultural vehicle chassis.

[0017] 2. The motor inside the chassis drives the second worm gear to rotate, which in turn drives the second worm wheel to rotate the drive shaft. The drive shaft, through a hexagonal shaft, drives the adjusting shaft to rotate, which in turn drives the connecting shaft to rotate. This causes the connecting shaft to rotate the support column and the drive wheel around the connecting shaft as its axis. The support columns and drive wheels at both ends of the frame can rotate in opposite directions. When the two front support columns and the two rear support columns of the frame move in opposite directions (refer to the instruction manual),... Figure 11 This reduces the overall height of the vehicle frame, making it easier to adjust the frame to the appropriate height according to the different heights of the crops, thus meeting the needs of crop irrigation or large-scale pesticide application.

[0018] 3. By moving the hexagonal block at the rectangular through-hole position on the positioning tube, the adjusting shaft is moved in the direction of the connecting shaft. This moves the hexagonal block from the cylindrical cavity position to the hexagonal cavity position, separating the hexagonal shaft from the adjusting shaft. At this point, the adjusted shaft, after being moved, is engaged inside the positioning tube and will not be rotated by the hexagonal shaft. Then, the motor drives the worm gear two to rotate, causing the worm gear two to rotate the hexagonal shaft. At this time, only the adjusting shaft at one end of the positioning tube rotates with the connecting shaft, achieving the goal of only one support column rotating under the same crossbeam (refer to the instruction manual). Figure 12 If a drive wheel under the frame gets stuck in the mud, the support column and drive wheel can be moved out by rotating them individually towards the ground. This makes it easier for the support column and drive wheel stuck in the mud to get out of the mud. In addition, multiple support columns can rotate individually with the corresponding drive wheel around the connecting shaft, making it easier to move drive wheels stuck in different positions out of the mud. Attached Figure Description

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] Figure 1-3 These are schematic diagrams of the overall structure of the present invention from different perspectives;

[0021] Figure 4 This is a schematic diagram of the vehicle frame and steering switching component structure in this invention;

[0022] Figure 5 This is a schematic diagram of the structure of transmission component one and transmission component two in this invention;

[0023] Figure 6 This is a schematic diagram of the connecting column, the second support shaft, and the second driving gear in this invention;

[0024] Figure 7 This is a schematic diagram of the linkage mechanism structure in this invention;

[0025] Figure 8 This is a schematic diagram of the overall structure of the bottom of the crossbeam in this invention;

[0026] Figure 9 This is a three-dimensional structural diagram of the positioning tube, adjusting shaft, and connecting shaft in this invention.

[0027] Figure 10 This is a schematic diagram of the overall external structure of the drive shaft in this invention;

[0028] Figure 11 This is a schematic diagram of the frame in the lowered height state of the present invention;

[0029] Figure 12 This is a schematic diagram of a drive wheel in a raised state in this invention;

[0030] Figure 13This is a schematic diagram of the driving wheel's trajectory movement state structure in this invention.

[0031] In the diagram: 100, frame; 110, connecting column; 111, positioning shaft; 1111, driven gear three; 1112, worm gear one; 120, steering lock; 121, connecting block; 122, cylinder; 130, driving gear three; 131, support shaft one; 140, support shaft two; 141, idler gear; 150, connecting seat; 151, worm gear one; 160, circular track; 200, crossbeam; 210, chassis; 211, worm gear two; 220, bearing; 300, positioning tube; 310, support column; 320, cylindrical cavity; 330, hexagonal cavity; 340, rectangular through hole; 400, adjusting shaft. ; 410, Connecting shaft; 411, Slot; 420, Hexagonal block; 500, Drive shaft; 510, Worm gear II; 520, Hexagonal shaft; 600, Transmission component I; 610, Linkage shaft I; 620, Driven gear I; 630, Electromagnetic clutch I; 640, Driven gear II; 700, Transmission component II; 710, Linkage shaft II; 720, Driving gear I; 730, Electromagnetic clutch II; 740, Driving gear II; 800, Linkage mechanism; 810, Shaft I; 820, Shaft II; 830, Connecting rod; 900, Steering switching component; 910, Steering shaft I; 920, Steering shaft II. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0033] Please see Figure 1-13As shown, the wheeled agricultural vehicle's same-track steering system includes a frame 100. Connecting columns 110 are rotatably connected to both ends of the frame 100. A crossbeam 200 is fixed to the bottom surface of each connecting column 110. Positioning tubes 300 are fixed to both ends of the bottom surface of each crossbeam 200. A support column 310 is rotatably connected to one end of each positioning tube 300. A drive wheel is rotatably connected to the bottom end of each support column 310. An adjusting shaft 400 is rotatably connected inside each positioning tube 300. One end of the adjusting shaft 400 is slidably engaged with a connecting shaft 410 fixedly connected to a corresponding support column 310. A transmission shaft 500 for driving the adjusting shaft 400 is rotatably connected between the two positioning tubes 300. A transmission component 600 is provided at the top of one connecting column 110, and a positioning shaft 111 is fixed to the top of the other connecting column 110. The transmission component 600 includes a linkage shaft 610 fixedly connected to the corresponding connecting column 110. A driven gear 620 is fixed at the top of the frame 100. An electromagnetic clutch 630 is installed in the middle of the linkage shaft 610. A driven gear 640 is fixed at the bottom of the linkage shaft 610. A transmission component 700 is provided on the outside of the transmission component 600. The transmission component 700 includes a linkage shaft 710 that is rotatably connected to the frame 100. A drive gear 720 that meshes with the driven gear 620 is fixed at the top of the linkage shaft 710. An electromagnetic clutch 730 is installed in the middle of the linkage shaft 710. A drive gear 740 is fixed at the bottom of the linkage shaft 710. A driven gear 1111 is fixed at the top of the positioning shaft 111. A drive gear 130 meshes with the outside of the driven gear 1111. A linkage mechanism 800 is connected between the drive gear 130 and the drive gear 720. A steering switching component 900 for driving the positioning shaft 111 to rotate is provided at one end of the top of the frame 100.

[0034] The positioning tube 300 has interconnected cylindrical cavities 320 and hexagonal cavities 330. A hexagonal block 420 is fixed to the end of the adjusting shaft 400 opposite to the connecting shaft 410. A hexagonal slot is provided at the end of the adjusting shaft 400 near the hexagonal block 420. Both ends of the drive shaft 500 are fixed with hexagonal shafts 520 that are movably inserted into the corresponding hexagonal slots. When the hexagonal block 420 on the adjusting shaft 400 moves into the cylindrical cavity 320, the drive shaft 500 rotates with it. When the hexagonal block 420 moves into the hexagonal cavity 330, the adjusting shaft 400 is fixed in place. The positioning tube 300 is not rotated by the drive shaft 500. The hexagonal slot facilitates the insertion of the hexagonal shaft 520 to rotate the adjusting shaft 400. One end of the adjusting shaft 400 has a round hole that slides with the connecting shaft 410. A locking block is fixed inside the round hole. The outer side of the connecting shaft 410 has a locking groove 411 that slides with the locking block. The outer side of the positioning tube 300 has a rectangular through hole 340, which allows the adjusting shaft 400 to slide on the outer side of the connecting shaft 410 and also rotates the connecting shaft 410 to rotate the support column 310. The rectangular through hole 340 facilitates the movement of the hexagonal block 420.

[0035] A worm gear 510 is fixedly sleeved on the outer side of the drive shaft 500. A housing 210 is fixed to the bottom of the crossbeam 200. A motor is fixed inside the housing 210. A worm gear 211 that meshes with the worm gear 510 is fixed to the output end of the motor. Annular tracks 160 are fixed to the bottom surfaces of both ends of the frame 100. Bearings 220 that are rolledly connected to the annular tracks 160 are fixed to both ends of the top surface of the crossbeam 200. This causes the motor to rotate the drive shaft 500, which in turn causes the adjusting shaft 400 to rotate the support column 310. The annular tracks 160 allow the bearings 220 to move stably, facilitating the stable rotation of the crossbeam 200. The linkage mechanism 800 includes a shaft 810. A nut is rotatably connected to one end of the shaft 810. A shaft 82, which is slidably inserted into the inner side of the nut, is screwed into the shaft 810. 20. Both shaft 1 810 and shaft 2 820 have a connecting rod 830 rotatably connected to their opposite ends. One connecting rod 830 is fixedly connected to the drive gear 3 130, and the other connecting rod 830 is fixedly connected to the drive gear 1 720. By rotating the nut, shaft 2 820 can be inserted into shaft 1 810 to different depths, achieving an adjustable installation spacing. The bottom of the positioning shaft 111 is fixed with a worm gear 1112, and one end of the frame 100 is fixed with a connecting seat 150. The connecting seat 150 is rotatably connected to a worm gear 151 that meshes with the worm gear 1112. The worm gear 151 is connected to the steering switching component 900, so that turning the steering wheel can cause the crossbeam 200 in front of the frame 100 to rotate with the support column 310 and the drive wheel.

[0036] The steering switching component 900 includes a steering shaft 1 910 and a steering shaft 2 920, which are rotatably connected by a universal joint. A bevel gear 1 is fixed to the end of the steering shaft 1 910 away from the universal joint, and a bevel gear 2 that meshes with the bevel gear 1 is fixed to one end of the worm gear 151. A steering wheel is fixed to the top of the steering shaft 2 920, so that the steering wheel and the steering shaft 2 920 are no longer driven on the same straight line. Rotating the steering wheel causes the crossbeam 200 at the front end of the frame 100 to rotate. The steering locking component 120 includes a connecting block 121 fixedly connected to the frame 100. A cylinder 122 is fixed to the outside of the connecting block 121. A locking block that is movably inserted into the corresponding connecting post 110 is fixed to the output end of the cylinder 122. The cylinder 122, carrying the locking block, is inserted into the corresponding connecting post 110 to lock the connecting post 110, thus achieving the requirement of independent steering of the front drive wheels.

[0037] Linkage shaft 1 610 includes drive shaft 1 and driven shaft 1, and electromagnetic clutch 1 630 is located between drive shaft 1 and driven shaft 1. Linkage shaft 2 710 includes drive shaft 2 and driven shaft 2, and electromagnetic clutch 2 730 is located between drive shaft 2 and driven shaft 2. This allows the electromagnetic clutch 630 to control whether the drive shaft 1 and driven shaft 1 are engaged in transmission, and the electromagnetic clutch 730 to control whether the drive shaft 2 and driven shaft 2 are engaged in transmission. The middle of the drive gear 3 130 is rotatably connected to the support shaft 131, which is fixedly connected to the frame 100. One end of the frame 100 is fixed to the support shaft 2 140, and the top of the support shaft 2 140 is rotatably connected to the idler gear 141. Both the driven gear 2 640 and the drive gear 2 740 are engaged with the idler gear 141 for transmission. The bottom end of the support column 310 is fixed to the hydraulic motor 311, and the output end of the hydraulic motor 311 is fixedly connected to the corresponding drive wheel. The hydraulic motor 311 facilitates the rotation of the corresponding drive wheel, and the idler gear 141 facilitates the connection and transmission between the driven gear 2 640 and the drive gear 2 740.

[0038] Working principle: In use, when it is necessary for the frame 100 to achieve the same trajectory for steering, taking clockwise rotation of the steering wheel as an example, clockwise rotation of the steering wheel causes steering shaft 1 910 and steering shaft 2 920 to rotate bevel gear 1. Bevel gear 1, through bevel gear 2, drives worm gear 151 to rotate. Worm gear 151 drives worm wheel 1112 to rotate, which in turn causes the connecting column 110 below the positioning shaft 111 to rotate the crossbeam 200 clockwise. The front crossbeam 200 of the frame 100, along with the two support columns 310 and the drive wheel, rotates clockwise synchronously. At the same time, driven gear 3 1111 drives driving gear 3 130 to rotate counterclockwise. Driving gear 3 130, through the connecting rod... 830 moves axle 2 820 towards the rear of frame 100, causing axle 1 810 to push drive gear 1 720, causing drive gear 1 720 to rotate clockwise. At this time, control electromagnetic clutch 2 730 is de-energized, disengaging drive shaft 2 and driven shaft 2 on linkage shaft 2 710. That is, drive gear 1 720 rotates but drive gear 2 740 does not rotate synchronously. Control electromagnetic clutch 1 630 is energized, engaging drive shaft 1 and driven shaft 1 on linkage shaft 1 610. This causes driven gear 1 620 to rotate linkage shaft 1 610 counterclockwise. The two support columns 310 on the rear crossbeam 200 of frame 100 drive the drive wheels to turn counterclockwise. Refer to the instruction manual. Figure 13 To achieve same-track steering of the vehicle frame 100, when it is necessary for the vehicle frame 100 to achieve same-phase steering, the electromagnetic clutch 630 is de-energized to separate the drive shaft and driven shaft on the linkage shaft 610, and the electromagnetic clutch 730 is energized to engage the drive shaft and driven shaft on the linkage shaft 710. At this time, the linkage mechanism 800 continues to drive the drive gear 720 to rotate clockwise. The driven gear 620 rotates on the linkage shaft 610 without driving the connecting column 110 to rotate. The drive gear 720 drives the drive gear 740 to rotate through the linkage shaft 710. Under the meshing transmission of the idler wheel 141, the driven gear 640 drives the connecting column 110 below it to rotate clockwise, thereby causing the crossbeam 200 below the linkage shaft 610 to drive the drive wheel to turn clockwise, thus achieving same-phase steering of the agricultural vehicle.

[0039] When it is necessary to steer the drive wheel at the front of the frame 100 independently, the output end of cylinder 122 inserts the locking block into the corresponding connecting post 110 to lock and fix the connecting post 110. At the same time, electromagnetic clutches 630 and 730 are de-energized, so that when the front wheels rotate in different directions, the direction and position of the rear wheels remain unchanged, realizing independent steering movement of the front wheels (the front wheels and rear wheels represent the front drive wheels and rear drive wheels, respectively). When it is necessary to adjust the height of the frame 100, taking the lowering of the frame 100 as an example, inside the housing 210... The motor drives the worm gear 211 to rotate, which in turn drives the drive shaft 500 to rotate via the worm wheel 510. The drive shaft 500 drives the adjusting shaft 400 to rotate via the hexagonal shaft 520. The adjusting shaft 400 drives the connecting shaft 410 to rotate, which in turn causes the connecting shaft 410 to rotate around the axis of the support column 310 and the drive wheel. The support columns 310 and the drive wheels at both ends of the frame 100 can rotate in opposite directions. When the two front support columns 310 and the two rear support columns 310 of the frame 100 move in opposite directions (refer to the instruction manual), Figure 11 This allows for a reduction in the overall height of the chassis by 100.

[0040] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0041] The above description is merely an example and illustration of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A wheeled agricultural vehicle's same-track steering system, comprising a frame (100), characterized in that, Both ends of the frame (100) are rotatably connected to connecting columns (110). A crossbeam (200) is fixed to the bottom surface of each connecting column (110). Positioning tubes (300) are fixed to both ends of the bottom surface of each crossbeam (200). A support column (310) is rotatably connected to one end of each positioning tube (300). A drive wheel is rotatably connected to the bottom end of each support column (310). An adjusting shaft (400) is rotatably connected inside each positioning tube (300). One end of the adjusting shaft (400) is slidably engaged with a connecting shaft (410) fixedly connected to a corresponding support column (310). A drive shaft (410) is rotatably connected between the two positioning tubes (300). 400) A rotating drive shaft (500), wherein a drive component (600) is provided on the top of one of the connecting columns (110), and a positioning shaft (111) is fixed on the top of the other connecting column (110). The positioning tube (300) has a columnar cavity (320) and a hexagonal cavity (330) that are interconnected inside. A hexagonal block (420) is fixed at one end of the adjusting shaft (400) away from the connecting shaft (410). A hexagonal slot is provided at one end of the adjusting shaft (400) near the hexagonal block (420). Both ends of the drive shaft (500) are fixed with hexagonal shafts (520) that are movably inserted into the hexagonal slots at the corresponding positions. The first transmission component (600) includes a first linkage shaft (610) fixedly connected to a corresponding connecting post (110). A driven gear (620) is fixed to the top of the first linkage shaft (610). An electromagnetic clutch (630) is installed in the middle of the first linkage shaft (610). A driven gear (640) is fixed to the bottom of the first linkage shaft (610). A second transmission component (700) is provided on the outer side of the first transmission component (600). The second transmission component (700) includes a second linkage shaft (710) rotatably connected to the frame (100). The top of the second linkage shaft (710) is fixed with a driven gear (620). The drive gear 1 (720) is engaged in the meshing transmission. An electromagnetic clutch 2 (730) is installed in the middle of the linkage shaft 2 (710). The drive gear 2 (740) is fixed at the bottom end of the linkage shaft 2 (710). The driven gear 3 (1111) is fixed at the top end of the positioning shaft (111). The drive gear 3 (130) is engaged in the transmission on the outer side of the driven gear 3 (1111). A linkage mechanism (800) is connected between the drive gear 3 (130) and the drive gear 1 (720). A steering switching component (900) for driving the positioning shaft (111) to rotate is provided at one end of the top of the frame (100).

2. The same-track steering system for wheeled agricultural vehicles according to claim 1, characterized in that, One end of the adjusting shaft (400) is provided with a circular hole that is slidably connected to the connecting shaft (410). A locking block is fixed inside the circular hole. A locking groove (411) that is slidably connected to the locking block is provided on the outside of the connecting shaft (410). A rectangular through hole (340) is provided on the outside of the positioning tube (300).

3. The same-track steering system for wheeled agricultural vehicles according to claim 1, characterized in that, A second worm gear (510) is fixedly sleeved on the outer side of the drive shaft (500). A housing (210) is fixed at the bottom of the crossbeam (200). A motor is fixed inside the housing (210). A second worm (211) that meshes with the second worm gear (510) is fixed at the output end of the motor. A ring track (160) is fixed on the bottom surface of both ends of the frame (100). Bearings (220) that are rollingly connected to the ring track (160) are fixed at both ends of the top surface of the crossbeam (200).

4. The same-track steering system for wheeled agricultural vehicles according to claim 1, characterized in that, The linkage mechanism (800) includes a shaft one (810), one end of which is rotatably connected to a nut, and the inner side of the nut is screwed onto a shaft two (820) which is slidably inserted into the shaft one (810). Both shaft one (810) and shaft two (820) are rotatably connected to a connecting rod (830) at opposite ends. One of the connecting rods (830) is fixedly connected to a driving gear three (130), and the other connecting rod (830) is fixedly connected to a driving gear one (720).

5. The same-track steering system for wheeled agricultural vehicles according to claim 1, characterized in that, The bottom of the positioning shaft (111) is fixed with a worm gear (1112), and one end of the frame (100) is fixed with a connecting seat (150). The connecting seat (150) is rotatably connected to a worm gear (151) that meshes with the worm gear (1112). The worm gear (151) is connected to the steering switching component (900).

6. The same-track steering system for wheeled agricultural vehicles according to claim 5, characterized in that, The steering switching component (900) includes a steering shaft one (910) and a steering shaft two (920), which are rotatably connected by a universal joint. A bevel gear one is fixed to the end of the steering shaft one (910) away from the universal joint, and a bevel gear two that meshes with the bevel gear one is fixed to one end of the worm gear one (151). A steering wheel is fixed to the top of the steering shaft two (920).

7. The same-track steering system for wheeled agricultural vehicles according to claim 1, characterized in that, A steering lock (120) is fixed to the bottom surface of one end of the frame (100). The steering lock (120) includes a connecting block (121) fixedly connected to the frame (100). A cylinder (122) is fixed to the outside of the connecting block (121). A locking block is fixed to the output end of the cylinder (122) and is movably inserted into the corresponding connecting post (110).

8. The same-track steering system for wheeled agricultural vehicles according to claim 1, characterized in that, The first linkage shaft (610) includes a first driving shaft and a first driven shaft. The first electromagnetic clutch (630) is located between the first driving shaft and the first driven shaft. The second linkage shaft (710) includes a second driving shaft and a second driven shaft. The second electromagnetic clutch (730) is located between the second driving shaft and the second driven shaft.

9. The same-track steering system for wheeled agricultural vehicles according to claim 1, characterized in that, The middle part of the driving gear three (130) is rotatably connected to the support shaft one (131) which is fixedly connected to the frame (100). One end of the frame (100) is fixed to the support shaft two (140). The top end of the support shaft two (140) is rotatably connected to the idler wheel (141). The driven gear two (640) and the driving gear two (740) are both meshed with the idler wheel (141) for transmission. The bottom end of the support column (310) is fixed to the hydraulic motor (311). The output end of the hydraulic motor (311) is fixedly connected to the corresponding drive wheel.

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