A chassis system for a corn combine harvester for hilly and mountainous areas

Abstract

The present invention specifically relates to a chassis system for a corn combine harvester for hilly and mountainous areas, which solves the problem that existing corn harvesters cannot meet the requirements of corn harvesting operations in hilly and mountainous areas. A chassis system for a corn combine harvester for hilly and mountainous areas includes front drive wheels, rear drive wheels, and a frame; a transmission system and a balance system are installed on the frame; the transmission system includes a dual-output shaft engine, a gearbox, a fast and slow gear gearbox, and a single-input and dual-output bevel gear power reversing box installed in the middle of the frame; the balance system includes two swing support seats, two frame fixed supports, and two balance cylinders. The present invention achieves the purpose of being able to operate a corn combine harvester in hilly and mountainous areas; the present invention has low power consumption, a small turning radius, and strong climbing and obstacle-crossing capabilities; it has the function of adjusting the balance of the frame, which improves safety and operational stability during operation; further, it improves the operating efficiency of the corn combine harvester and its adaptability to complex terrain.

Description

Technical Field

[0001] The present invention relates to the field of agricultural machinery, in particular to a chassis system of a corn combine harvester for hilly and mountainous areas. Background Art

[0002] Corn, a staple crop in my country, has achieved consistently high and stable yields in recent years, making it the country's most produced crop. Hilly and mountainous areas account for nearly 70% of my country's total land area, and corn is widely cultivated in these areas. While wheat and rice production in my country are largely mechanized, the level of mechanization in corn production remains relatively low, particularly in the harvesting process. Harvesting is the most labor-intensive step in corn production, accounting for approximately 55% of the total labor. Mechanized harvesting can increase production efficiency by nearly 30 times compared to manual harvesting, reduce harvest losses by 3%-5%, and increase farmers' income. Corn in hilly and mountainous areas is often grown on sloping land, with small, irregular plots. The varieties planted, the planting period, and the harvesting period differ from those in plains areas, resulting in significant differences in the mechanical properties of corn stalks at harvest.

[0003] However, traditional corn harvesters are primarily suited for operations in plain areas, with limited performance on hilly terrain and poor regional adaptability. Currently, most existing single-row or two-row corn harvesters are used in hilly and mountainous areas. These harvesters are generally oversized (generally greater than 6 meters in length), have a high center of gravity, and feature poorly arranged functional modules, leading to difficult steering and prone to rollover. Furthermore, the design of key components fails to consider the impact of corn planting characteristics, plant properties, and harvesting methods on harvesting performance. As a result, these harvesters are unable to meet the requirements of corn harvesting operations in hilly and mountainous areas, resulting in high rates of ear and kernel loss and breakage, and low harvesting efficiency.

[0004] Therefore be necessary to invent a kind of hilly mountain corn combine harvester chassis system to adapt to complex terrain. Summary of the Invention

[0005] In order to solve the problem that the existing corn harvester cannot meet the harvesting operation requirements of corn in hilly and mountainous areas, the present invention provides a chassis system for a hilly and mountainous area corn combine harvester.

[0006] The present invention is achieved by adopting the following technical solutions:

[0007] A chassis system for a corn combine harvester for hilly and mountainous areas includes two front drive wheels, two rear drive wheels, and a frame; a transmission system and a balancing system are installed on the frame;

[0008] The transmission system includes a dual-output shaft engine, a gearbox, a fast and slow gear gearbox and a single-input and dual-output bevel gear power reversing box installed in the middle of the frame. A pulley is fixedly assembled on one of the output shafts of the dual-output shaft engine, and a pulley 1 is fixedly assembled on the input shaft of the gearbox, and the pulley and pulley 1 are connected through belt transmission; the speed change input shaft of the fast and slow gear gearbox is fixedly connected to the output shaft of the gearbox; the reversing input shaft of the bevel gear power reversing box is fixedly connected to the speed change output shaft of the fast and slow gear gearbox; the front and rear ends of the reversing output shaft of the bevel gear power reversing box are each equipped with a cross universal joint coupling; the tail end of the cross universal joint coupling located on the front side is connected to the front drive axle, and the tail end of the cross universal joint coupling located on the rear side is connected to the rear drive axle; the two front drive wheels are respectively mounted on the two ends of the front drive axle, and the two rear drive wheels are respectively mounted on the two ends of the rear drive axle;

[0009] The balancing system includes two swing support seats respectively hinged to the middle part of the front drive axle and the middle part of the rear drive axle, each of the two swing support seats is fixed with a frame fixed support, and the frame is fixed to the two frame fixed supports; two balancing oil cylinders distributed along the front and back are provided on the frame, and the cylinder ends of the two balancing oil cylinders are respectively hinged to the upper part of the frame; the piston ends of the two balancing oil cylinders are respectively hinged to one of the half-axles of the front drive axle and one of the half-axles of the rear drive axle.

[0010] Furthermore, it also includes a steering system; the steering system includes a front-drive steering mechanism and a rear-drive steering mechanism, which are respectively located on the front side of the front drive axle and the rear side of the rear drive axle; the front-drive steering mechanism and the rear-drive steering mechanism both include a two-way oil cylinder hinged on the front drive axle or the rear drive axle and placed laterally; the tail end of the left piston rod and the tail end of the right piston rod of the two-way oil cylinder are each hinged to a steering rod, the tail end of the two steering rods are each hinged to a steering arm, the tail end of the two steering arms are each fixedly connected to a steering knuckle, and the two steering knuckles are respectively fixedly connected to the two front drive wheels or the two rear drive wheels.

[0011] Furthermore, the tail ends of the left piston rod and the right piston rod of the bidirectional oil cylinder are each hinged to the corresponding steering rod through a universal joint coupling; the tail ends of the two steering rods are each hinged to the corresponding steering arm through a fixed hinge support.

[0012] Furthermore, the fast and slow gear transmission is L-shaped; the fast and slow gear transmission includes a speed input shaft, a transmission shaft, a transmission shaft I and a transmission shaft II that are arranged to rotate in sequence from back to front, and a speed output shaft that can move forward and backward. The speed input shaft is fixedly equipped with a driving wheel, the transmission shaft is fixedly equipped with a transmission gear that meshes with the driving wheel, the transmission shaft I is fixedly equipped with a small transmission gear that meshes with the transmission gear and a large transmission gear located on the left side of the small transmission gear, the transmission shaft II is fixedly equipped with a transmission gear I that meshes with the large transmission gear and a transmission gear II located on the left side of the transmission gear I, and the diameter of the transmission gear II is larger than the diameter of the transmission gear I; the speed output shaft is fixedly equipped with a double gear with a left gear diameter smaller than a right gear diameter; the speed output shaft is connected to a shift fork rod arranged in the same direction as it.

[0013] Furthermore, the bevel gear power reversing box includes a reversing input shaft arranged in the transverse direction and a reversing output shaft arranged in the longitudinal direction, the reversing input shaft is fixedly equipped with a bevel gear, and the reversing output shaft is fixedly equipped with a bevel gear I meshing with the bevel gear.

[0014] Furthermore, a radiator is provided above the dual-shaft engine.

[0015] Furthermore, the two front drive wheels and the two rear drive wheels are both 6.0-16 cross-section bias agricultural tires.

[0016] The structural design of the present invention is reasonable and reliable, and the purpose of operating the corn combine harvester in hilly and mountainous areas is achieved; the overall size and mass of the present invention are small, and it can smoothly enter the hillside to operate; it has low power consumption, a small turning radius, and strong climbing and obstacle-crossing capabilities; further, it realizes lateral and longitudinal tilt adjustment, has the function of adjusting the balance of the frame, improves the safety and operational stability during the operation process, and reduces the labor intensity of the driver; further, it improves the operating efficiency of the corn combine harvester and its adaptability to complex terrain. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention.

[0018] Figure 2 It is a schematic diagram of the internal structure of the present invention.

[0019] Figure 3 It is a structural diagram of the transmission system in the present invention.

[0020] Figure 4 It is a structural diagram of the balancing system in the present invention.

[0021] Figure 5 It is a schematic diagram of the working state of the balancing system in the present invention.

[0022] Figure 6 It is a structural schematic diagram of the steering system in the present invention.

[0023] Figure 7 It is a structural diagram of the fast and slow gear transmission in the present invention.

[0024] Figure 8 It is a schematic diagram of the internal structure of the fast and slow gear transmission of the present invention.

[0025] Figure 9 It is a structural diagram of the bevel gear power reversing box in the present invention.

[0026] In the figure: 1-front drive wheel, 2-rear drive wheel, 3-frame, 4-dual-output shaft engine, 5-pulley, 6-gearbox, 7-pulley I, 8-belt, 9-fast and slow gearbox, 10-speed input shaft, 11-speed output shaft, 12-bevel gear power reversing box, 13-reversing input shaft, 14-reversing output shaft, 15-cross universal joint coupling, 16-front drive axle, 17-rear drive axle, 18-swing support seat, 19-frame fixed support, 20-balance Cylinder, 21-bidirectional cylinder, 22-steering rod, 23-steering arm, 24-steering knuckle, 25-universal joint coupling, 26-fixed hinge support, 27-drive shaft, 28-drive shaft I, 29-drive shaft II, 30-driving wheel, 31-drive gear, 32-small drive gear, 33-large drive gear, 34-drive gear I, 35-drive gear II, 36-double gear, 37-shift fork rod, 38-bevel gear, 39-bevel gear I, 40-radiator. DETAILED DESCRIPTION

[0027] A chassis system for a corn combine harvester for hilly and mountainous areas, as shown in the attached Figure 1 -Attached Figure 9 As shown, it includes two front drive wheels 1, two rear drive wheels 2, and a frame 3; a transmission system and a balance system are installed on the frame 3;

[0028] The transmission system includes a dual-output shaft engine 4, a gearbox 6, a fast and slow gearbox 9 and a single-input and dual-output bevel gear power reversing box 12 installed in the middle of the frame 3. A pulley 5 is fixedly mounted on one of the output shafts of the dual-output shaft engine 4, and a pulley I7 is fixedly mounted on the input shaft of the gearbox 6. The pulley 5 and the pulley I7 are connected by a belt 8; the speed input shaft 10 of the fast and slow gearbox 9 is fixedly connected to the output shaft of the gearbox 6; the reversing output of the bevel gear power reversing box 12 is fixedly mounted on the output shaft of the gearbox The input shaft 13 is fixedly connected to the speed output shaft 11 of the fast and slow gearbox 9; a cross universal joint coupling 15 is installed at the front and rear ends of the reversing output shaft 14 of the bevel gear power reversing box 12; the rear end of the cross universal joint coupling 15 on the front side is connected to the front drive axle 16, and the rear end of the cross universal joint coupling 15 on the rear side is connected to the rear drive axle 17; the two front drive wheels 1 are respectively mounted on the two ends of the front drive axle 16, and the two rear drive wheels 2 are respectively mounted on the two ends of the rear drive axle 17;

[0029] The balancing system includes two swing support seats 18 respectively hinged to the middle of the front drive axle 16 and the middle of the rear drive axle 17, each of which is fixed with a frame fixed support 19, and the frame 3 is fixed on the two frame fixed supports 19; two balancing cylinders 20 distributed along the front and back are provided on the frame 3, and the cylinder ends of the two balancing cylinders 20 are respectively hinged to the upper part of the frame 3; the piston ends of the two balancing cylinders 20 are respectively hinged to one of the half-axles of the front drive axle 16 and one of the half-axles of the rear drive axle 17.

[0030] As attached Figure 3 As shown, the transmission system of the present invention adopts a mechanical transmission method, wherein one output end of the dual-output shaft engine 4 provides driving force for equipment such as the harvesting device and the threshing device in the corn combine harvester, and the other output end is used for the walking drive and climbing drive of the corn combine harvester; the gearbox 6 adopts a belt drive method to transmit the driving force from the dual-output shaft engine 4 to the fast and slow gearbox 9, the fast and slow gearbox 9 transmits the driving force to the bevel gear power reversing box 12, and the dual outputs of the bevel gear power reversing box 12 transmit the driving force to the front drive axle 16 and the rear drive axle 17, thereby driving the front drive wheel 1 and the rear drive wheel 2 to move.

[0031] As attached Figure 4 , Attachment Figure 5As shown, the balancing system in the present invention adopts a three-point articulated cylinder leveling method; wherein the front drive axle 16 and the rear drive axle 17 both adopt three-point articulated cylinder leveling; taking the front drive axle 16 as an example, the three hinge points are respectively the swing support seat 18 hinged on the front drive axle 16, the hinge between the cylinder end of the balancing cylinder 20 and the upper part of the frame 3, and the hinge between the piston end of the balancing cylinder 20 and one of the half-axles of the front drive axle 16; when leveling, the frame 3 uses the connecting line of the two swing support seats 18 as the central axis of rotation, and then the extension and retraction of the balancing cylinder 20 are controlled to achieve the purpose of keeping the frame 3 in a horizontal state.

[0032] An attitude sensor is installed on the frame 3, and the data monitored in real time by the attitude sensor is used to control the extension and retraction of the piston of the balancing cylinder 20; taking the front drive axle 16 as an example, when the ground is level, the piston of the balancing cylinder 20 is in a semi-extended state; when the ground is higher on the left and lower on the right, the front drive axle 16 is in a state of higher on the left and lower on the right, and the attitude sensor is used to monitor in real time and then control the retraction of the piston of the balancing cylinder 20. When the piston of the balancing cylinder 20 retracts, it drives the cylinder barrel of the balancing cylinder 20 to rotate to the left, and then drives the frame 3 to rotate to the left, bringing the frame 3 back to a horizontal state; thereby completing the balance adjustment of the frame when the ground is higher on the left and lower on the right; no matter whether the present invention is traveling on a rough road, operating on a slope, or overcoming obstacles, the frame 3 can always remain in a horizontal state.

[0033] The present invention has a maximum speed of 10.98 km / h and a minimum speed of 0.91 km / h; a maximum transmission ratio of 370.37 and a minimum transmission ratio of 61.38; a gearbox 6 with three forward gears and one reverse gear; the transmission ratios of the three forward gears are 3.747, 9.403, and 22.644, respectively, and the transmission ratio of the reverse gear is 10.563; a leveling range of the balancing system of -25° to +25°, enabling adaptive leveling; uphill and downhill limit tilt angles of 55.38° and 44.03°, respectively; uphill and downhill longitudinal slip angles of 26.62° and 13.18°, respectively; a maximum lateral tilt angle of 40.01°, a lateral limit slip angle of 26°, and a critical obstacle clearance height of 264.5 mm, meeting the operating requirements of corn combine harvesters in hilly and mountainous areas. This overcomes the problem that existing corn harvesters cannot meet the requirements of corn harvesting operations in hilly and mountainous areas.

[0034] As attached Figure 6As shown, it also includes a steering system; the steering system includes a front-drive steering mechanism and a rear-drive steering mechanism, which are respectively located on the front side of the front drive axle 16 and the rear side of the rear drive axle 17; the front-drive steering mechanism and the rear-drive steering mechanism both include a two-way oil cylinder 21 hinged to the front drive axle 16 or the rear drive axle 17 and placed laterally; the left piston rod tail end and the right piston rod tail end of the two-way oil cylinder 21 are respectively hinged to a steering rod 22, and the tail end of the two steering rods 22 is respectively hinged to a steering arm 23, and the tail end of the two steering arms 23 is respectively fixedly connected to a steering knuckle 24, and the two steering knuckles 24 are respectively fixedly connected to the two front drive wheels 1 or the two rear drive wheels 2.

[0035] As attached Figure 6 As shown, the steering system of the present invention is a disconnected trapezoidal structure design, which can realize three types of steering: front wheel deflection, four-wheel deflection and lateral shift; taking the front-wheel steering mechanism as an example, through the oil inlet and outlet of the two-way oil cylinder 21, the left piston rod and the right piston rod of the two-way oil cylinder 21 are synchronized and horizontally moved in the same direction, and then respectively drive the two steering rods 22 to swing, and the two steering rods 22 then respectively drive the two steering arms 23 to move, and then respectively drive the two steering knuckles 24 and the two front drive wheels 1 to steer; the steering principles of the front-wheel steering mechanism and the rear-wheel steering mechanism are the same.

[0036] When only the front-wheel drive steering mechanism is in operation, the front wheel deflection can be achieved; when the front-wheel drive steering mechanism and the rear-wheel drive steering mechanism are in operation at the same time, four-wheel deflection can be achieved, and side shift can also be achieved.

[0037] When the front wheel is deflected, the minimum turning radius is 2003mm; when the four wheels are deflected, the minimum turning radius is 1494mm. The two steering modes improve the adaptability of the corn combine harvester to operate in small areas in hilly and mountainous areas.

[0038] As attached Figure 6 As shown, the left piston rod tail end and the right piston rod tail end of the two-way oil cylinder 21 are each hinged to the corresponding steering rod 22 through a universal joint coupling 25; the tail ends of the two steering rods 22 are each hinged to the corresponding steering arm 23 through a fixed hinge support 26.

[0039] As attached Figure 7 , Attachment Figure 8As shown, the fast and slow gear transmission 9 is L-shaped; the fast and slow gear transmission 9 includes a speed change input shaft 10, a transmission shaft 27, a transmission shaft I28, and a transmission shaft II29 that are arranged to rotate in sequence from back to front, and a speed change output shaft 11 that can move forward and backward. The speed change input shaft 10 is fixedly equipped with a driving wheel 30, the transmission shaft 27 is fixedly equipped with a transmission gear 31 that meshes with the driving wheel 30, the transmission shaft I28 is fixedly equipped with a small transmission gear 32 that meshes with the transmission gear 31 and a large transmission gear 33 located on the left side of the small transmission gear 32, the transmission shaft II29 is fixedly equipped with a transmission gear I34 that meshes with the large transmission gear 33 and a transmission gear II35 located on the left side of the transmission gear I34, and the diameter of the transmission gear II35 is larger than the diameter of the transmission gear I34; the speed change output shaft 11 is fixedly equipped with a double gear 36 whose left gear diameter is smaller than that of the right gear; the speed change output shaft 11 is connected to a shift fork rod 37 that is arranged in the same direction as it.

[0040] In the present invention, since the gearbox 6 has fewer gears and cannot meet the operation requirements in hilly and mountainous areas, a fast and slow gearbox 9 is added to the transmission system.

[0041] When the slow gear is working, the shift fork rod 37 is moved to make the transmission gear I34 mesh with the double gear 36 on the right side; when the driving force of the dual-output shaft engine 4 enters the speed change input shaft 10, the speed change input shaft 10 drives the driving wheel 30 to rotate, and the driving wheel 30 transmits the driving force to the transmission gear 31, the small transmission gear 32, the large transmission gear 33, the transmission gear I34, and the double gear 36 on the right side in sequence through the meshing transmission action, and finally the driving force is transmitted to the bevel gear power reversing box 12 by the speed change output shaft 11; at this time, the transmission ratio is 1:1.

[0042] When the fast gear is working, the shift fork rod 37 is moved to make the transmission gear II35 mesh with the double gear 36 on the left; when the driving force of the dual-output shaft engine 4 enters the speed change input shaft 10, the speed change input shaft 10 drives the driving wheel 30 to rotate, and the driving wheel 30 transmits the driving force to the transmission gear 31, the small transmission gear 32, the large transmission gear 33, the transmission gear I34, the transmission gear II35, and the double gear 36 on the left in sequence through the meshing transmission action, and finally the driving force is transmitted to the bevel gear power reversing box 12 by the speed change output shaft 11; at this time, the transmission ratio is 2:1.

[0043] As attached Figure 9 As shown, the bevel gear power reversing box 12 includes a reversing input shaft 13 arranged in the transverse direction and a reversing output shaft 14 arranged in the longitudinal direction. The reversing input shaft 13 is fixedly assembled with a bevel gear 38, and the reversing output shaft 14 is fixedly assembled with a bevel gear I39 meshing with the bevel gear 38.

[0044] In the present invention, since the front drive axle 16 and the rear drive axle 17 have the same structure and model, it is necessary to utilize the same-direction output characteristic of the bevel gear power reversing box 12 to achieve the purpose of consistent driving directions for the front drive axle 16 and the rear drive axle 17. The bevel gear power reversing box 12 has an axis intersection angle E = 90° and a transmission ratio of 1:1. The bevel gears 38 and 139 both have 33 teeth, a module of 4, a tooth width of 31mm, a pressure angle of 20°, a pitch circle diameter of 132mm, a tooth addendum diameter of 140mm, a tooth root diameter of 122mm, a taper pitch of 93mm, and a pitch circle tooth thickness of 6.28mm.

[0045] As attached Figure 1 As shown, a radiator 40 is provided above the dual-shaft engine 4 .

[0046] The models of the two front driving wheels 1 and the two rear driving wheels 2 are both 6.0-16 cross-section bias agricultural tires.

[0047] 6.0-16 cross-section bias agricultural tire with good anti-skid and grip performance and strong passability.

[0048] During the specific implementation process, the present invention also includes a braking system, which uses a belt I for braking, and completes braking through the friction torque generated between the brake drum on the gearbox 6 and the belt I.

[0049] The cylinder ends of the two balancing cylinders 20 and the upper part of the frame 3, the piston ends of the balancing cylinders 20 and one of the half-axles of the front drive axle 16, and the piston ends of the balancing cylinders 20 and one of the half-axles of the rear drive axle 17 are all hinged through fixed hinge supports I and cylindrical pins.

[0050] The vehicle has a usable mass of 2200 kg, an overall dimension of 2545 mm*1588 mm*1251 mm, a matching power of 58.8 kW (80 horsepower), a wheelbase of 1800 mm, a track of 1296 mm, and a minimum ground clearance of 312 mm.

[0051] When the present invention is assembled, the harvester is connected to the front drive axle 16 so that the harvesting surface of the harvester is always in contact with the ground; the corn harvester and the corn thresher are both installed on the frame 3 to ensure that the corn harvester and the corn thresher are always kept in a horizontal state.

[0052] In the description of the present invention, it should be understood that the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0053] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A chassis system for a corn combine harvester for hilly areas, comprising two front drive wheels (1), two rear drive wheels (2), and a frame (3); characterized in that: A transmission system and a balancing system are installed on the vehicle frame (3); the transmission system includes a dual-output shaft engine (4), a gearbox (6), a fast and slow gearbox (9) and a single-input and dual-output bevel gear power reversing box (12) installed in the middle of the vehicle frame (3); a pulley (5) is fixedly mounted on one of the output shafts of the dual-output shaft engine (4); a pulley I (7) is fixedly mounted on the input shaft of the gearbox (6); the pulley (5) and the pulley I (7) are connected to each other through a belt (8); the speed change input shaft (10) of the fast and slow gearbox (9) is fixedly connected to the output shaft of the gearbox (6); the bevel gear power reversing box (12) is fixedly mounted on the output shaft of the gearbox (6); The reversing input shaft (13) of the power reversing box (12) is fixedly connected to the speed output shaft (11) of the fast and slow gearbox (9); a cross universal joint coupling (15) is respectively installed at the front end and the rear end of the reversing output shaft (14) of the bevel gear power reversing box (12); the rear end of the cross universal joint coupling (15) located on the front side is connected to the front drive axle (16), and the rear end of the cross universal joint coupling (15) located on the rear side is connected to the rear drive axle (17); the two front drive wheels (1) are respectively installed at the two ends of the front drive axle (16), and the two rear drive wheels (2) are respectively installed at the two ends of the rear drive axle (17); The balancing system comprises two swing support seats (18) respectively hinged to the middle of the front drive axle (16) and the middle of the rear drive axle (17), a frame fixed support (19) is fixed to each of the two swing support seats (18), and the frame (3) is fixed to the two frame fixed supports (19); two balancing oil cylinders (20) distributed along the front and rear are provided on the frame (3), and the cylinder ends of the two balancing oil cylinders (20) are respectively hinged to the upper part of the frame (3); the piston ends of the two balancing oil cylinders (20) are respectively hinged to one of the half shafts of the front drive axle (16) and one of the half shafts of the rear drive axle (17); The vehicle further comprises a steering system; the steering system comprises a front-drive steering mechanism and a rear-drive steering mechanism, the front-drive steering mechanism and the rear-drive steering mechanism being located at the front side of the front drive axle (16) and the rear side of the rear drive axle (17), respectively; the front-drive steering mechanism and the rear-drive steering mechanism both comprise a bidirectional oil cylinder (21) hinged to the front drive axle (16) or the rear drive axle (17) and placed in the transverse direction; the left piston rod tail end and the right piston rod tail end of the bidirectional oil cylinder (21) are each hinged to a steering tie rod (22), the tail ends of the two steering tie rods (22) are each hinged to a steering arm (23), the tail ends of the two steering arms (23) are each fixedly connected to a steering knuckle (24), and the two steering knuckles (24) are respectively fixedly connected to the two front drive wheels (1) or the two rear drive wheels (2); The tail ends of the left and right piston rods of the bidirectional oil cylinder (21) are each hinged to the corresponding steering tie rod (22) via a universal joint coupling (25); the tail ends of the two steering tie rods (22) are each hinged to the corresponding steering arm (23) via a fixed hinge support (26).

2. The chassis system of a corn combine harvester for hilly and mountainous areas according to claim 1, characterized in that: The fast and slow gear transmission (9) is L-shaped; the fast and slow gear transmission (9) comprises a speed change input shaft (10), a transmission shaft (27), a transmission shaft I (28) which are arranged to rotate in sequence from the back to the front, a transmission shaft II (29) which are arranged to rotate in sequence from the top to the bottom, and a speed change output shaft (11) which can move forward and backward, a driving wheel (30) fixedly mounted on the speed change input shaft (10), a transmission gear (31) which meshes with the driving wheel (30) fixedly mounted on the transmission shaft (27), and a small transmission gear which meshes with the transmission gear (31) fixedly mounted on the transmission shaft I (28). (32) and a large transmission gear (33) located on the left side of the small transmission gear (32), a transmission gear I (34) meshing with the large transmission gear (33) and a transmission gear II (35) located on the left side of the transmission gear I (34) are fixedly assembled on the transmission shaft II (29), and the diameter of the transmission gear II (35) is larger than the diameter of the transmission gear I (34); a double gear (36) with a left gear diameter smaller than a right gear diameter is fixedly assembled on the speed change output shaft (11); and a shift fork rod (37) arranged in the same direction as the speed change output shaft (11) is connected to the speed change output shaft (11).

3. The chassis system of a corn combine harvester for hilly and mountainous areas according to claim 1, characterized in that: The bevel gear power reversing box (12) comprises a reversing input shaft (13) arranged in the transverse direction and a reversing output shaft (14) arranged in the longitudinal direction, a bevel gear (38) being fixedly mounted on the reversing input shaft (13), and a bevel gear I (39) meshing with the bevel gear (38) being fixedly mounted on the reversing output shaft (14).

4. The chassis system of a corn combine harvester for hilly and mountainous areas according to claim 1, characterized in that: A radiator (40) is provided above the dual-shaft engine (4).

5. The chassis system of a corn combine harvester for hilly and mountainous areas according to claim 1, characterized in that: The two front drive wheels (1) and the two rear drive wheels (2) are both 6.0-16 cross-section bias agricultural tires.

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