Frame type bowing steering tractor chassis

Abstract

The utility model discloses a frame type bowing steering tractor chassis which comprises a bowing swing frame, a power system, a front axle and a rear axle are arranged on the bowing swing frame, the power system simultaneously drives the front axle and the rear axle through a transmission mechanism, and the bowing swing frame comprises a front frame, a middle frame and a rear frame. The transmission mechanism comprises a four-wheel-drive transfer case, a cross-shaped transmission shaft, a second transmission shaft and a first transmission shaft, the front output end of the four-wheel-drive transfer case drives the front axle through the first transmission shaft, and the rear output end of the four-wheel-drive transfer case drives the rear axle through the cross-shaped transmission shaft and the second transmission shaft. The distances between flange end surfaces at two ends of the cross-shaped transmission shaft and the steering pin shaft are equal; the minimum turning radius can be effectively reduced; when the tractor steers in a bowing mode, power of the power system can be transmitted to the rear axle, so that four-wheel-drive running is achieved, the tractor can adapt to complex terrains of hills and mountains, and the trafficability of the tractor on non-flat operation road surfaces is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of agricultural machinery technology, and in particular, to a frame-type folding steering tractor chassis. Background Technology

[0002] At present, agricultural industrialization, farmer professionalization, and rural community development have become new trends. As the number of people engaged in agricultural production continues to decrease, agricultural mechanization is imminent for new agricultural business entities such as family farms, large-scale professional farmers, rural cooperatives, and leading industrial enterprises.

[0003] Tractors are self-propelled power machines used to traction and drive work machinery to complete various mobile operations. With the development of rural forestry, planting, and animal husbandry, tractors need to be suitable for complex road conditions such as swamps, farmland, mountains, and forest areas.

[0004] Traditional tractor steering methods include front-wheel steering and pin-type articulated steering. Front-wheel steering uses a steering mechanism to control the front wheels to turn, thus steering the tractor. This steering method has a relatively large minimum turning radius, requiring two to three maneuvers to complete a turn on narrow roads. Pin-type articulated steering effectively reduces the turning radius, but the presence of the articulated steering mechanism makes it difficult to transfer power from one axle to another. Tractors generally use a single diesel engine, so traditional articulated tractors are often front-wheel drive or rear-wheel drive. Hilly and mountainous terrain is complex, often with steep slopes and uneven terrain. These two-wheel drive tractors have difficulty navigating such complex terrain, resulting in low passability. Utility Model Content

[0005] This invention provides a frame-type folding steering tractor chassis to solve the technical problem that existing two-wheel drive tractors have difficulty traveling and have low passability when facing complex terrain such as hills and mountains.

[0006] According to one aspect of the present invention, a frame-type articulated steering tractor chassis is provided, including an articulated swing frame. A power system, a front axle, and a rear axle are mounted on the articulated swing frame. The power system simultaneously drives the front axle and the rear axle via a transmission mechanism. The articulated swing frame includes a front frame, a middle frame, and a rear frame. The front frame and the middle frame are hinged together by a steering pin. The transmission mechanism includes a four-wheel drive transfer case, a cross drive shaft, a second drive shaft, and a first drive shaft. The front output end of the four-wheel drive transfer case drives the front axle via the first drive shaft, and the rear output end of the four-wheel drive transfer case drives the rear axle via the cross drive shaft and the second drive shaft. The flange end faces at both ends of the cross drive shaft are equidistant from the steering pin.

[0007] Furthermore, the power system includes a mounting bracket, an engine, a clutch, a gearbox, and a coupling. The engine, clutch, gearbox, and four-wheel drive transfer case are mounted on the front frame via the mounting bracket. The power output end of the engine is connected to the input end of the clutch, the output end of the clutch is connected to the input end of the gearbox, and the output end of the gearbox is connected to the input end of the four-wheel drive transfer case via the coupling.

[0008] Furthermore, the mounting bracket is connected to the front frame via a vibration damping device. The vibration damping device includes a first vibration damping block, a first protective cover disposed on the first vibration damping block, a second vibration damping block symmetrically disposed with respect to the first vibration damping block, a second protective cover disposed on the second vibration damping block, a bolt, and a nut adapted to the bolt. The bolt passes through the mounting bracket, the first protective cover, the first vibration damping block, the second vibration damping block, and the second protective cover in sequence. The nut cooperates with the bolt to clamp the first vibration damping block and the second vibration damping block onto the front frame.

[0009] Furthermore, the folding swing frame includes a swing pin and a steering cylinder. The intermediate frame and the rear frame are hinged through the swing pin. The swing pin is arranged perpendicularly to the steering pin. One end of the steering cylinder is hinged to the front frame, and the other end of the steering cylinder is hinged to the intermediate frame.

[0010] Furthermore, the two steering pins are spaced apart, and the swing pins are coaxially provided with through holes. The second drive shaft passes through the through holes and its two ends are respectively connected to the cross drive shaft and the rear axle.

[0011] Furthermore, the front frame is provided with a front mounting seat for hinged to the first end of the steering cylinder, the intermediate frame is provided with a rear mounting seat for hinged to the second end of the steering cylinder, and the steering cylinder is provided with a cylinder limiting block for restricting its retraction.

[0012] Furthermore, a steering limit plate is provided on the front frame, and a steering limit block is provided on the intermediate frame. The steering limit plate and the steering limit block cooperate to limit the maximum turning angle of the front frame and the intermediate frame.

[0013] Furthermore, a swing limiting block is provided on the intermediate frame, and a swing limiting plate is provided on the rear frame. The swing limiting block and the swing limiting plate cooperate to limit the maximum swing angle of the intermediate frame and the rear frame.

[0014] Furthermore, the front frame and / or the intermediate frame are provided with a first bearing for connecting the steering pin, and the intermediate frame and / or the rear frame are provided with a second bearing for connecting the swing pin.

[0015] Furthermore, the front axle is equipped with a front wheel or a front triangular track, and the rear axle is equipped with a rear wheel or a rear triangular track.

[0016] This utility model has the following beneficial effects:

[0017] This utility model relates to a frame-type swayback steering tractor chassis, primarily used in high-horsepower tractors. The front axle is mounted on the front frame, and the rear axle on the rear frame. The first driveshaft is mounted on the front frame, with its two ends connected to the front axle and the front output end of the four-wheel drive transfer case, respectively. The cross driveshaft and the second driveshaft are mounted on the intermediate frame. The rear output end of the four-wheel drive transfer case, the cross driveshaft, the second driveshaft, and the rear axle are connected in sequence. The front frame and the intermediate frame of the swayback chassis are hinged by a steering pin, allowing the front frame to sway relative to the intermediate frame around axle A, effectively reducing the minimum turning radius. The distance from the flange end face at both ends of the cross driveshaft to axle A is L, enabling the four-wheel drive transfer case to transmit power from the power system to the rear axle when the tractor is swaying, thus achieving four-wheel drive. This allows the tractor to adapt to complex terrain in hilly and mountainous areas, significantly improving its passability on uneven working surfaces.

[0018] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0020] Figure 1 This is a schematic diagram of the frame-type folding steering tractor chassis of a preferred embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the power system of a preferred embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the transmission mechanism of a preferred embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the transmission mechanism of the preferred embodiment of the present invention during steering;

[0024] Figure 5 This is a schematic diagram of the frame-type folding steering tractor chassis of a preferred embodiment of the present invention during steering;

[0025] Figure 6This is a schematic diagram of the rear frame swing structure of a preferred embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of the structure of the hydraulic cylinder limiting block according to a preferred embodiment of the present invention;

[0027] Figure 8 This is a schematic diagram of the vibration damping device according to a preferred embodiment of the present invention;

[0028] Figure 9 This is one of the structural schematic diagrams of the first bearing in a preferred embodiment of this utility model;

[0029] Figure 10 This is one of the structural schematic diagrams of the second bearing in a preferred embodiment of this utility model;

[0030] Figure 11 These are schematic diagrams of the first and second preferred embodiments of the present invention.

[0031] Figure 12 This is the second schematic diagram of the structure of the second bearing in a preferred embodiment of this utility model;

[0032] Figure 13 This is a schematic diagram of the front triangular track of a preferred embodiment of the present invention.

[0033] Legend:

[0034] 1. Mounting bracket; 2. Engine; 3. Clutch; 4. Gearbox; 5. Coupling; 6. Four-wheel drive transfer case; 7. Cross drive shaft; 8. Second drive shaft; 9. Rear axle; 10. Rear wheel; 11. First drive shaft; 12. Front axle; 13. Front wheel; 14. Vibration damping device; 1402. First damping block; 1403. First protective cover; 1404. Second damping block; 1405. Second protective cover; 1401. Bolt; 1406. Nut; 15. Alternating sway bar 1501. Front frame; 1502. Intermediate frame; 1503. Rear frame; 1504. Steering pin; 1505. Swing pin; 1506. Steering cylinder; 1507. Steering limit plate; 1508. Steering limit block; 1509. Swing limit block; 1510. Swing limit plate; 1511. Cylinder limit block; 1512. Through hole; 16. Front triangular track; 17. Rear triangular track; 18. First bearing; 19. Second bearing. Detailed Implementation

[0035] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0036] Please refer to the following: Figures 1 to 13The frame-type folding steering tractor chassis of this embodiment includes a folding swing frame 15. The folding swing frame 15 is equipped with a power system, a front axle 12, and a rear axle 9. The power system drives the front axle 12 and the rear axle 9 simultaneously through a transmission mechanism. The folding swing frame 15 includes a front frame 1501, a middle frame 1502, and a rear frame 1503. The front frame 1501 and the middle frame 1502 are hinged through a steering pin 1504. The transmission mechanism includes a four-wheel drive transfer case 6, a cross drive shaft 7, a second drive shaft 8, and a first drive shaft 11. The front output end of the four-wheel drive transfer case 6 drives the front axle 12 through the first drive shaft 11, and the rear output end of the four-wheel drive transfer case 6 drives the rear axle 9 through the cross drive shaft 7 and the second drive shaft 8. The flange end faces at both ends of the cross drive shaft 7 are equidistant from the steering pin 1504, and the axis of the steering pin 1504 is shaft A.

[0037] This embodiment features a frame-type swayback steering tractor chassis, primarily used in high-horsepower tractors. The front axle 12 is mounted on the front frame 1501, and the rear axle 9 is mounted on the rear frame 1503. A first driveshaft 11 is mounted on the front frame 1501, with its two ends connected to the front axle 12 and the front output end of the four-wheel drive transfer case 6, respectively. A cross driveshaft 7 and a second driveshaft 8 are mounted on the intermediate frame 1502, and the rear output end of the four-wheel drive transfer case 6, the cross driveshaft 7, the second driveshaft 8, and the rear axle 9 are sequentially connected. The swayback steering frame 15 has a front... The front frame 1501 and the intermediate frame 1502 are hinged by the steering pin 1504, which allows the front frame 1501 to tilt relative to the intermediate frame 1502 with the axle A as the axis, effectively reducing the minimum turning radius. The distance from the flange end face at both ends of the cross drive shaft 7 to the axle A is L, which allows the four-wheel drive transfer case 6 to transmit the power of the power system to the rear axle 9 when the tractor bends and turns, thereby realizing four-wheel drive and enabling the tractor to adapt to the complex terrain of hilly and mountainous areas, greatly improving the tractor's passability on uneven working roads.

[0038] like Figure 1 and Figure 2 As shown, in this embodiment, the power system includes a mounting bracket 1, an engine 2, a clutch 3, a gearbox 4, and a coupling 5. The engine 2, clutch 3, gearbox 4, and four-wheel drive transfer case 6 are mounted on the front frame 1501 via the mounting bracket 1. The power output end of the engine 2 is connected to the input end of the clutch 3, the output end of the clutch 3 is connected to the input end of the gearbox 4, and the output end of the gearbox 4 is connected to the input end of the four-wheel drive transfer case 6 via the coupling 5. The power system adopts a traditional dual-clutch and gearbox transmission route, which is economical and easy to implement. The engine 2, clutch 3, gearbox 4, coupling 5, and four-wheel drive transfer case 6 are externally mounted via the mounting bracket 1 and then uniformly hoisted onto the folding swing frame 15, which facilitates installation and debugging.

[0039] like Figure 2 and Figure 8 As shown, in this embodiment, the mounting bracket 1 is connected to the front frame 1501 via a vibration damping device 14. The vibration damping device 14 includes a first damping block 1402, a first protective cover 1403 arranged on the first damping block 1402, a second damping block 1404 symmetrically arranged with the first damping block 1402, a second protective cover 1405 arranged on the second damping block 1404, a bolt 1401, and a nut 1406 adapted to the bolt 1401. The bolt 1401 passes sequentially through the mounting bracket 1, the first protective cover 1403, the first damping block 1402, the second damping block 1404, and the second protective cover 1405. The nut 1406 cooperates with the bolt 1401 to make the first damping block 1402 and the second damping block 1404... 4. Clamp the front frame 1501; the power system is installed on the mounting bracket 1, which presses against the first protective cover 1403. The vibration damping device 14 is installed on the front frame 1501 through the cooperation of the first damping block 1402 and the second damping block 1404. This can effectively ensure that the front axle of the tractor still bears no less than 20% of the total vehicle weight under extreme working conditions, effectively preventing wheel-over. The power system and the front frame 1501 are independently arranged, which is convenient for disassembly and maintenance. When the power system is working, the deformation and reset of the first damping block 1402 and the second damping block 1404 can effectively isolate the vibration from the power system. On the one hand, it can reduce the wear of mechanical parts, and on the other hand, it can avoid affecting the operator.

[0040] like Figure 3 , Figure 5 and Figure 6 As shown, in this embodiment, the folding swing frame 15 includes a swing pin 1505 and a steering cylinder 1506. The intermediate frame 1502 and the rear frame 1503 are hinged together by the swing pin 1505. The swing pin 1505 is perpendicular to the steering pin 1504, and the axis of the swing pin 1505 is shaft B, that is, shaft A and shaft B are perpendicular. One end of the steering cylinder 1506 is hinged to the front frame 1501, and the other end of the steering cylinder 1506 is hinged to the intermediate frame 1502. When the steering cylinder 1506 rotates... When the hydraulic cylinder 1506 is activated, it causes the front frame 1501 to sway relative to the intermediate frame 1502 around axis A, thereby enabling the tractor to make small-radius turns. The intermediate frame 1502 is hinged to the rear frame 1503 via a swing pin 1505, allowing the rear frame 1503 to swing left and right around axis B in a vertical plane. This reduces the occurrence of individual wheels leaving the ground when the tractor travels on uneven terrain, reducing bumps during travel, thereby reducing wear on parts and extending service life. Optionally, such as... Figure 5As shown, two steering cylinders 1506 are symmetrically arranged on both sides of the intermediate frame 1502. When turning, the two steering cylinders 1506 work simultaneously. One steering cylinder 1506 extends to push the front frame 1501 to turn, and the other steering cylinder 1506 retracts to pull the front frame 1501 to turn. Compared with using a single high-thrust cylinder, using two low-thrust steering cylinders 1506 can reduce costs.

[0041] like Figure 3 and Figure 10 As shown, in this embodiment, two steering pins 1504 are spaced apart and are arranged through shafts with the axis being shaft A. A through hole 1512 is coaxially provided on the swing pin 1505. The second drive shaft 8 passes through the through hole 1512 and its two ends are respectively connected to the cross drive shaft 7 and the rear axle 9. The two steering pins 1504 are respectively hinged to the upper and lower ends of the front frame 1501 and the middle frame 1502. Compared with using a long through shaft, two short pins can reduce the weight of the steering pin 1504 and also provide clearance for the second drive shaft 8. The second drive shaft 8 can pass through the gap between the two steering pins 1504 and the through hole 1512 on the swing pin 1505 to connect to the cross drive shaft 7. The cross drive shaft 7 is connected to the rear output end of the four-wheel drive transfer case 6. The second drive shaft 8 is arranged in the folding swing frame 15, which can protect the second drive shaft 8 and prevent the second drive shaft 8 from being damaged by collisions in the complex terrain of hilly areas.

[0042] like Figure 7 As shown, in this embodiment, the front frame 1501 is provided with a front mounting seat for hinged steering cylinder 1506 at the first end, and the middle frame 1502 is provided with a rear mounting seat for hinged steering cylinder 1506 at the second end. The steering cylinder 1506 is provided with a cylinder limiting block 1511 for limiting its retraction. When turning is required, the cylinder limiting block 1511 is removed from the piston rod, allowing the steering cylinder 1506 to extend and retract freely, enabling the tractor to smoothly complete the turning / U-turn action. After the tractor turns / U-turns, when the cylinder limiting block 1511 is installed on the piston rod of the steering cylinder 1506, the retraction of the steering cylinder 1506 can be limited, allowing the tractor to maintain straight-line travel.

[0043] like Figure 5As shown, in this embodiment, a steering limiting plate 1507 is provided on the front frame 1501, and a steering limiting block 1508 is provided on the intermediate frame 1502. The steering limiting plate 1507 and the steering limiting block 1508 cooperate to limit the maximum turning angle α of the front frame 1501 and the intermediate frame 1502. A steering limiting groove is provided on the steering limiting plate 1507, and the steering limiting block 1508 is arranged in the steering limiting groove. When the tractor is traveling horizontally, the steering limiting block 1508 is located in the center of the steering limiting groove. When the tractor turns, the front frame 1501 can swing left and right in the horizontal plane around the steering axis. The current frame 1501 swings to the left in the horizontal plane until the left side wall of the steering limit groove abuts against the steering limit block 1508. At this time, the swing angle between the front frame 1501 and the intermediate frame 1502 is the maximum swing angle α. The current frame 1501 then swings to the right in the horizontal plane until the right side wall of the steering limit groove abuts against the steering limit block 1508. At this time, the swing angle between the front frame 1501 and the intermediate frame 1502 is also the maximum swing angle α. The maximum swing angle α is preset according to the tractor's dimensions, which can minimize the tractor's turning radius while avoiding interference between components on the frame. Optionally, the maximum turning angle α is 30-45°. If the maximum turning angle α is greater than 45°, on the one hand, it may cause interference between components on the frame; on the other hand, the internal wear of the tractor will increase significantly, leading to a shortened lifespan of the transmission structure. If the maximum swing angle α is less than 30°, the tractor's turning radius is too large, resulting in poor passability in narrow areas. Optionally, the maximum turning angle α is 40°.

[0044] like Figure 6As shown, in this embodiment, a swing limiting block 1509 is provided on the intermediate frame 1502, and a swing limiting plate 1510 is provided on the rear frame 1503. The swing limiting block 1509 and the swing limiting plate 1510 cooperate to limit the maximum swing angle β of the intermediate frame 1502 and the rear frame 1503. An arc-shaped limiting groove is provided on the swing limiting plate 1510, and the swing limiting block 1509 is arranged in the arc-shaped limiting groove. When the tractor is traveling horizontally, the swing limiting block 1509 is located in the center of the arc-shaped limiting groove. When the tractor enters uneven terrain, the rear frame 1503 can swing left and right in the vertical plane around the swing pin 1505. When the rear frame 1503 swings to the left in the vertical plane until the left side wall of the arc-shaped limiting groove abuts the swing limiting block 1509, the intermediate frame 1502 and the rear frame 1503 are at the swing limit. The swing angle between the intermediate frame 1502 and the rear frame 1503 is the maximum swing angle β. When the rear frame 1503 swings to the right in the vertical plane until the right side wall of the arc-shaped limiting groove abuts against the swing limiting block 1509, the swing angle between the intermediate frame 1502 and the rear frame 1503 is also the maximum swing angle β. The maximum swing angle β is preset according to the center of gravity height of the rear frame, which can ensure the tractor's passability on uneven terrain while preventing the tractor from overturning. Optionally, the maximum swing angle β is 10–20°. If the maximum swing angle β is greater than 20°, the swing amplitude of the rear frame 1503 is too large, which may cause the tractor to overturn; if the maximum swing angle β is less than 10°, the swing amplitude of the rear frame 1503 is too small, and the tractor's passability on uneven terrain is poor. Optionally, the maximum swing angle β is 11°.

[0045] In this embodiment, a first bearing 18 for connecting the steering pin 1504 is provided on the front frame 1501 and / or the intermediate frame 1502. The first bearing 18 can reduce frictional resistance during steering and extend the service life of the frame. A second bearing 19 for connecting the swing pin 1505 is provided on the intermediate frame 1502 and / or the rear frame 1503. The second bearing 19 can reduce frictional resistance during swinging and extend the service life of the frame. Optionally, as... Figure 9 As shown, the first bearing 18 is a rolling bearing, which is mounted on the front frame 1501. The steering pin 1504 is mounted on the intermediate frame 1502 and hinged to the front frame 1501 via the rolling bearing. The rolling bearing has low frictional resistance, which can reduce the frictional resistance of the front frame 1501 relative to the intermediate frame 1502 during steering. Optionally, as... Figure 11As shown, the first bearing 18 is a sliding bearing. Two sliding bearings are respectively mounted on the front frame 1501 and the intermediate frame 1502. The steering pin 1504 is hinged to the front frame 1501 and the intermediate frame 1502 through the sliding bearings. The sliding bearing has a large bearing area and is buffered by a lubricating oil film, making it more impact-resistant and suitable for rugged roads in hilly and mountainous areas. Optionally, the first bearing 18 is a spherical plain bearing. The outer ring of the spherical plain bearing is connected to the front frame 1501, and the inner ring of the spherical plain bearing is connected to the steering pin 1504. The spherical plain bearing not only hinges the front frame 1501 and the intermediate frame 1502, but also allows the steering pin 1504 to have a certain amount of sway relative to the front frame 1501, allowing the connection between the front frame 1501 and the intermediate frame 1502 to arch upwards, improving the tractor's passability on rugged roads in hilly and mountainous areas. Optionally, as... Figure 10 As shown, the second bearing 19 is a rolling bearing, which is mounted on the intermediate frame 1502. The swing pin 1505 is mounted on the rear frame 1503 and hinged to the intermediate frame 1502 via the rolling bearing. The rolling bearing has low frictional resistance, which can reduce the frictional resistance of the rear frame 1503 swinging relative to the intermediate frame 1502. Optionally, as... Figure 12 As shown, the second bearing 19 is a sliding bearing, which is mounted on the intermediate frame 1502. The swing pin 1505 is mounted on the rear frame 1503 and is hinged to the intermediate frame 1502 via the sliding bearing. The sliding bearing has a large bearing area and is buffered by a lubricating oil film, making it more resistant to impact and suitable for rugged roads in hilly and mountainous areas. Optionally, the second bearing 19 is a spherical plain bearing. The outer ring of the spherical plain bearing is connected to the intermediate frame 1502, and the inner ring of the spherical plain bearing is connected to the swing pin 1505. The spherical plain bearing not only hinges the intermediate frame 1502 and the rear frame 1503, but also allows the connection between the intermediate frame 1502 and the rear frame 1503 to arch upwards, improving the tractor's passability on rugged roads in hilly and mountainous areas.

[0046] like Figure 3 As shown, in this embodiment, the front frame 1501 is equipped with the front axle 12 via the front axle mounting bracket, and front wheels 13 are mounted on the left and right sides of the front axle 12. The rear frame 1503 is equipped with the rear axle 9 via the rear axle mounting bracket, and rear wheels 10 are mounted on the left and right sides of the rear axle 9 respectively. The front wheels 13 and the rear wheels 10 are rubber pneumatic tires, suitable for highways and mountain roads.

[0047] like Figure 13 As shown, in this embodiment, the front frame 1501 is equipped with the front triangular track 16 via the front track wheel mounting seat, and the front triangular track 16 is driven by the front axle 12. The rear frame 1503 is equipped with the rear triangular track 17 via the rear track wheel mounting seat, and the rear triangular track 17 is driven by the rear axle 9. It can adapt to road conditions such as snow, mud, and sand.

[0048] This utility model relates to a frame-type folding steering tractor chassis, primarily used in high-horsepower tractors. The folding structure effectively reduces the minimum turning radius. It employs a traditional dual-clutch and gearbox transmission route, offering high economy and ease of implementation. The engine 2, clutch 3, gearbox 4, coupling 5, and four-wheel drive transfer case 6 are externally mounted via a mounting bracket 1 and then uniformly suspended on the folding swing frame 15, facilitating installation and adjustment. A vibration damping device 14 is installed at the interface between the mounting bracket 1 and the folding swing frame 15, effectively isolating vibration signals from the power transmission system. The four-wheel drive system provides excellent off-road capability. The front frame 1501 and rear frame 1503 can swing independently, ensuring all four tires remain firmly planted on uneven surfaces. It features both tire and track driving modes, offering strong road adaptability.

[0049] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A frame-type folding steering tractor chassis, characterized in that, The vehicle includes a sway-arm frame (15), on which a power system, a front axle (12), and a rear axle (9) are mounted. The power system drives the front axle (12) and the rear axle (9) simultaneously via a transmission mechanism. The sway-arm frame (15) includes a front frame (1501), a middle frame (1502), and a rear frame (1503). The front frame (1501) and the middle frame (1502) are hinged together by a steering pin (1504). The transmission mechanism includes a four-wheel drive transfer case (6), a cross drive shaft (7), a second drive shaft (8), and a first drive shaft (11). The front output end of the four-wheel drive transfer case (6) drives the front axle (12) through the first drive shaft (11), and the rear output end of the four-wheel drive transfer case (6) drives the rear axle (9) through the cross drive shaft (7) and the second drive shaft (8). The flange end faces at both ends of the cross drive shaft (7) are equidistant from the steering pin shaft (1504).

2. The frame-type articulated steering tractor chassis according to claim 1, characterized in that, The power system includes a mounting bracket (1), an engine (2), a clutch (3), a gearbox (4), and a coupling (5). The engine (2), clutch (3), gearbox (4), and four-wheel drive transfer case (6) are mounted on the front frame (1501) via the mounting bracket (1). The power output end of the engine (2) is connected to the input end of the clutch (3), the output end of the clutch (3) is connected to the input end of the gearbox (4), and the output end of the gearbox (4) is connected to the input end of the four-wheel drive transfer case (6) via the coupling (5).

3. The frame-type articulated steering tractor chassis according to claim 2, characterized in that, The mounting bracket (1) is connected to the front frame (1501) via a vibration damping device (14). The vibration damping device (14) includes a first damping block (1402), a first protective cover (1403) disposed on the first damping block (1402), a second damping block (1404) symmetrically disposed with respect to the first damping block (1402), a second protective cover (1405) disposed on the second damping block (1404), bolts (1401), and a connection to the bolts. A nut (1406) is fitted to the bolt (1401). The bolt (1401) passes through the mounting bracket (1), the first guard (1403), the first damping block (1402), the second damping block (1404), and the second guard (1405) in sequence. The nut (1406) cooperates with the bolt (1401) so that the first damping block (1402) and the second damping block (1404) clamp the front frame (1501).

4. The frame-type articulated steering tractor chassis according to any one of claims 1 to 3, characterized in that, The folding swing frame (15) includes a swing pin (1505) and a steering cylinder (1506). The intermediate frame (1502) and the rear frame (1503) are hinged together by the swing pin (1505). The swing pin (1505) and the steering pin (1504) are arranged perpendicularly. One end of the steering cylinder (1506) is hinged to the front frame (1501), and the other end of the steering cylinder (1506) is hinged to the intermediate frame (1502).

5. The frame-type articulated steering tractor chassis according to claim 4, characterized in that, Two steering pins (1504) are arranged at intervals. A through hole is provided coaxially on the swing pin (1505). The second drive shaft (8) passes through the through hole and its two ends are respectively connected to the cross drive shaft (7) and the rear axle (9).

6. The frame-type articulated steering tractor chassis according to claim 4, characterized in that, The front frame (1501) is provided with a front cylinder mounting seat for hinged to the first end of the steering cylinder (1506), the intermediate frame (1502) is provided with a rear cylinder mounting seat for hinged to the second end of the steering cylinder (1506), and the steering cylinder (1506) is provided with a cylinder limiting block (1511) for limiting its retraction.

7. The frame-type articulated steering tractor chassis according to any one of claims 1 to 3, characterized in that, A steering limit plate (1507) is provided on the front frame (1501), and a steering limit block (1508) is provided on the intermediate frame (1502). The steering limit plate (1507) and the steering limit block (1508) cooperate to limit the maximum turning angle of the front frame (1501) and the intermediate frame (1502).

8. The frame-type articulated steering tractor chassis according to any one of claims 1 to 3, characterized in that, A swing limiting block (1509) is provided on the intermediate frame (1502), and a swing limiting plate (1510) is provided on the rear frame (1503). The swing limiting block (1509) and the swing limiting plate (1510) cooperate to limit the maximum swing angle of the intermediate frame (1502) and the rear frame (1503).

9. The frame-type articulated steering tractor chassis according to claim 4, characterized in that, The front frame (1501) and / or the intermediate frame (1502) are provided with a first bearing (18) for connecting the steering pin (1504), and the intermediate frame (1502) and / or the rear frame (1503) are provided with a second bearing (19) for connecting the swing pin (1505).

10. The frame-type articulated steering tractor chassis according to any one of claims 1 to 3, characterized in that, The front axle (12) is equipped with a front wheel (13) or a front triangular track (16), and the rear axle (9) is equipped with a rear wheel (10) or a rear triangular track (17).

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