Bowing steering tractor frame
By designing a folding steering tractor chassis, the front and rear chassis can swing flexibly, solving the problem of wheels detaching from the wheels of traditional tractors on uneven terrain, improving passability and component life, and adapting to complex terrain.
Patent Information
- Application Number
- CN202520144697.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-22
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-01-22
AI Technical Summary
Traditional tractors are prone to having a single wheel lose contact with the ground on uneven terrain, leading to difficulty in driving, low passability, and the generation of large torque during driving, which affects the wear and tear of parts.
A hinged steering tractor frame was designed. By hinged steering shafts between the front and middle frames and swing pins between the middle and rear frames, the front frame can swing in the horizontal plane and the rear frame can swing in the vertical plane, reducing the minimum turning radius. The design of spaced steering pins and power transmission shafts protects the power transmission shaft and enables four-wheel drive.
It effectively reduces the number of times a single wheel of the tractor leaves the ground on uneven terrain, improves passability, reduces wear on parts, extends service life, adapts to complex terrain, and protects the power transmission shaft.
Smart Images
Figure CN223835677U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of agricultural machinery technology, and in particular, to a folding steering tractor frame. 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 deflection of the front wheels, thus turning 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 generally, articulated tractors cannot achieve vertical swaying between the front and rear bodies. This can cause individual wheels to lift off the ground when the tractor travels on uneven terrain. On the one hand, this makes it difficult for the tractor to travel on uneven terrain, resulting in low passability. On the other hand, the bumps during travel generate significant torque, causing greater wear on parts and affecting their service life. Utility Model Content
[0005] This utility model provides a hinged steering tractor frame to solve the technical problem that existing tractors are prone to having a single wheel leave the ground on uneven terrain, causing the tractor to have difficulty traveling on uneven terrain, low passability, and large torque generated during the bumpy ride, resulting in greater wear on parts.
[0006] According to one aspect of the present invention, a hinged steering tractor chassis is provided, comprising a front chassis for mounting a front axle and a power system, a rear chassis for mounting a rear axle, an intermediate chassis for connecting the front chassis and the rear chassis, and a hinged steering mechanism. The hinged steering mechanism includes a steering shaft for hinged connection between the front chassis and the intermediate chassis, and a steering cylinder for adjusting the angle between the front chassis and the intermediate chassis. The steering shaft includes an upper steering pin and a lower steering pin arranged coaxially and at intervals. The intermediate chassis is connected to the rear chassis via a swing pin. The swing pin has a coaxial through hole for a power transmission shaft connecting the front axle and the rear axle to pass through.
[0007] Furthermore, the front frame and / or the intermediate frame are provided with a first bearing for connecting the steering shaft, and the intermediate frame and / or the rear frame are provided with a second bearing for connecting the swing pin.
[0008] Furthermore, the front frame is provided with an upper hinge plate and a lower hinge plate, the intermediate frame is provided with an upper hinge seat and a lower hinge seat, the upper hinge plate and the lower hinge plate are respectively provided with a first bearing, the upper steering pin is provided on the upper hinge seat and connected to the first bearing on the upper hinge plate, and the lower steering pin is provided on the lower hinge seat and connected to the first bearing on the lower hinge plate.
[0009] 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.
[0010] 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.
[0011] 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.
[0012] Furthermore, a powertrain mounting bracket is provided on the front frame, and a vibration damping device for connecting the powertrain is provided on the powertrain mounting bracket. The vibration damping device includes a first damping block, a first protective cover provided on the first damping block, a second damping block symmetrically provided with the first damping block, a second protective cover provided on the second damping block, a bolt, and a nut adapted to the bolt. The bolt passes through the powertrain bracket, the first protective cover, the first damping block, the second damping block, and the second protective cover in sequence. The nut cooperates with the bolt to clamp the first damping block and the second damping block to the powertrain mounting bracket.
[0013] Furthermore, the front frame is provided with a front axle mounting seat and / or a front track wheel mounting seat, and the rear frame is provided with a rear axle mounting seat and / or a rear track wheel mounting seat.
[0014] Furthermore, the front frame is equipped with a cab mounting seat, a first lifting lug, a cooling system mounting seat, and a front suspension system mounting seat.
[0015] Furthermore, the rear frame is equipped with a traction rod mounting seat, a rear suspension system mounting seat, and a PTO output shaft mounting seat.
[0016] This utility model has the following beneficial effects:
[0017] This utility model relates to a hinged steering tractor frame, primarily used in high-horsepower tractors. The front frame and intermediate frame are hinged together by a steering shaft, allowing the front frame to swing left and right in the horizontal plane around the steering shaft under the drive of the steering cylinder, effectively reducing the minimum turning radius. The intermediate frame is hinged to the rear frame via a swing pin, allowing the rear frame to swing left and right in the vertical plane around the swing pin, effectively reducing the occurrence of individual tractor wheels leaving the ground. Using the intermediate frame as a transitional structure clearly defines the functional zones of the frame structure, reducing structural complexity while improving installation and maintenance performance. The steering shaft employs spaced upper and lower steering pins. The steering pins are hinged to the upper and lower ends of the front and middle frames, respectively. Compared with a single long through shaft, two short pins can reduce the weight of the steering shaft and provide clearance for the power transmission shaft. The swing pin has a through hole on the same axis, through which the power transmission shaft can pass to the gap between the upper and lower steering pins and the through hole on the swing pin to connect the front and rear axles. On the one hand, the power transmission shaft is located inside the frame, which can protect the power transmission shaft and prevent it from being damaged by collisions in the complex terrain of hilly and mountainous areas. On the other hand, it can realize four-wheel drive, enabling the tractor to adapt to the complex terrain of hilly and mountainous areas and greatly improving the tractor's passability on uneven working roads.
[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 structure of a folding steering tractor frame according to a preferred embodiment of the present invention;
[0021] Figure 2 This is a schematic diagram of the structure of the steering shaft according to a preferred embodiment of the present invention;
[0022] Figure 3 This is a schematic diagram of the front frame structure of a preferred embodiment of the present invention;
[0023] Figure 4This is a schematic diagram of the intermediate frame of a preferred embodiment of the present invention;
[0024] Figure 5 This is a schematic diagram of the rear frame structure of a preferred embodiment of the present invention;
[0025] Figure 6 This is one of the structural schematic diagrams of the upper hinge plate in a preferred embodiment of the present utility model;
[0026] Figure 7 This is one of the structural schematic diagrams of the lower hinge plate of a preferred embodiment of this utility model;
[0027] Figure 8 This is one of the structural schematic diagrams of the second bearing in a preferred embodiment of this utility model;
[0028] Figure 9 This is a second schematic diagram of the upper hinge plate in a preferred embodiment of the present invention;
[0029] Figure 10 This is the second schematic diagram of the structure of the lower hinge plate in a preferred embodiment of this utility model;
[0030] Figure 11 This is the second schematic diagram of the structure of the second bearing in a preferred embodiment of this utility model;
[0031] Figure 12 This is a schematic diagram of the vibration damping device according to a preferred embodiment of the present invention;
[0032] Figure 13 This is a schematic diagram of the maximum turning angle of a preferred embodiment of the present invention;
[0033] Figure 14 This is a structural schematic diagram of the maximum swing angle of a preferred embodiment of the present invention;
[0034] Figure 15 This is a schematic diagram of the structure of the cylinder limiting block according to a preferred embodiment of the present invention.
[0035] Legend:
[0036] 100. Power system bracket; 1. Front frame; 11. Upper hinge plate; 12. Lower hinge plate; 13. First bearing; 101. Power system mounting bracket; 102. Front axle mounting bracket; 103. Front track wheel mounting bracket; 104. Front cylinder mounting bracket; 105. Steering limit plate; 106. Cab mounting bracket; 107. First lifting lug; 108. Cooling system mounting bracket; 109. Front suspension system mounting bracket; 2. Intermediate frame; 21. Upper hinge bracket; 22. Lower hinge bracket; 23. Second bearing; 201. Rear cylinder mounting bracket; 202. Swing limit block; 203. 1. Steering limit block; 204. Second lifting lug; 3. Rear frame; 301. Swing limit plate; 302. Rear axle mounting seat; 303. Rear track wheel mounting seat; 304. Tow bar mounting seat; 305. Rear suspension system mounting seat; 306. PTO output shaft mounting seat; 4. Steering cylinder; 5. Upper steering pin; 6. Lower steering pin; 7. Swing pin; 71. Through hole; 8. Cylinder limit block; 9. Vibration damping device; 902. First vibration damping block; 903. First protective cover; 904. Second vibration damping block; 905. Second protective cover; 901. Bolt; 906. Nut. Detailed Implementation
[0037] 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.
[0038] Please refer to the following: Figures 1 to 15 The folding steering tractor chassis of this embodiment includes a front frame 1 for mounting the front axle and power system, a rear frame 3 for mounting the rear axle, an intermediate frame 2 for connecting the front frame 1 and the rear frame 3, and a folding steering mechanism. The folding steering mechanism includes a steering shaft for hinged connection between the front frame 1 and the intermediate frame 2 and a steering cylinder 4 for adjusting the angle between the front frame 1 and the intermediate frame 2. The steering shaft includes an upper steering pin 5 and a lower steering pin 6 arranged coaxially and at intervals. The intermediate frame 2 is connected to the rear frame 3 through a swing pin 7. The swing pin 7 is coaxially provided with a through hole 71 for the power transmission shaft connecting the front axle and the rear axle to pass through.
[0039] The folding steering tractor frame of this embodiment is mainly used in high-horsepower tractors. The front frame 1 and the intermediate frame 2 are hinged together by a steering shaft, allowing the front frame 1 to swing left and right in the horizontal plane around the steering shaft under the drive of the steering cylinder 4, effectively reducing the minimum turning radius. The intermediate frame 2 is hinged to the rear frame 3 by a swing pin 7, allowing the rear frame 3 to swing left and right in the vertical plane around the swing pin 7. This reduces the occurrence of a single wheel leaving the ground when the tractor is traveling on uneven terrain, reduces bumps during travel, thereby reducing wear on parts and extending service life. Using the intermediate frame 2 as a transition structure separates the steering structure from the swing structure, resulting in clear structural functional zoning. This reduces structural complexity while improving efficiency. This improves its installation and maintenance performance; the upper steering pin 5 and the lower steering pin 6 are respectively hinged to the upper and lower ends of the front frame 1 and the middle frame 2. Compared with using a long through shaft, the two short pins can reduce the weight of the steering shaft and provide clearance for the power transmission shaft. The power transmission shaft can pass through the gap between the upper steering pin 5 and the lower steering pin 6 and the through hole 71 on the swing pin 7 to connect the front axle and the rear axle. On the one hand, the power transmission shaft is installed in the frame, which can protect the power transmission shaft and avoid damage to the power transmission shaft caused by collisions in the complex terrain of hilly and mountainous areas. On the other hand, it can realize four-wheel drive, enabling the tractor to adapt to the complex terrain of hilly and mountainous areas and greatly improving the tractor's passability on uneven working roads.
[0040] In this embodiment, a first bearing 13 for connecting the steering shaft is provided on the front frame 1 and / or the intermediate frame 2. The first bearing 13 can reduce the frictional resistance during steering and extend the service life of the frame. A second bearing 23 for connecting the swing pin 7 is provided on the intermediate frame 2 and / or the rear frame 3. The second bearing 23 can reduce the frictional resistance during swinging and extend the service life of the frame. Optionally, the first bearing 13 is a rolling bearing. Rolling bearings have low frictional resistance and can reduce the frictional resistance of the front frame 1 relative to the intermediate frame 2 during steering. Optionally, the first bearing 13 is a sliding bearing. Sliding bearings have a large bearing area and are buffered by a lubricating oil film, making them more impact-resistant and suitable for rugged roads in hilly and mountainous areas. Optionally, the first bearing 13 is a spherical bearing. Spherical bearings allow the steering shaft to have a certain amount of sway space relative to the front frame 1, allowing the connection between the front frame 1 and the intermediate frame 2 to arch upwards, which can improve the tractor's passability on rugged roads in hilly and mountainous areas. Optionally, the second bearing 23 is a rolling bearing. Rolling bearings have low frictional resistance, which can reduce the frictional resistance caused by the swinging of the rear frame 3 relative to the intermediate frame 2. Optionally, the second bearing 23 is a sliding bearing. Sliding bearings have a large bearing area and are cushioned by a lubricating oil film, resulting in stronger impact resistance and making them suitable for rugged roads in hilly and mountainous areas. Optionally, the second bearing 23 is a spherical plain bearing, which allows the connection between the intermediate frame 2 and the rear frame 3 to arch upwards, improving the tractor's passability on rugged roads in hilly and mountainous areas.
[0041] In this embodiment, the front frame 1 is provided with an upper hinge plate 11 and a lower hinge plate 12, and the middle frame 2 is provided with an upper hinge seat 21 and a lower hinge seat 22. First bearings 13 are respectively provided on the upper hinge plate 11 and the lower hinge plate 12. An upper steering pin 5 is provided on the upper hinge seat 21 and connected to the first bearing 13 on the upper hinge plate 11, and a lower steering pin 6 is provided on the lower hinge seat 22 and connected to the first bearing 13 on the lower hinge plate 12. Optionally, as... Figure 6 As shown, a first bearing 13 is provided on the upper hinge plate 11, and the first bearing 13 is a rolling bearing. Optionally, as... Figure 7 As shown, a first bearing 13 is provided on the lower hinge plate 12, and the first bearing 13 is a rolling bearing. Optionally, as... Figure 9 As shown, a first bearing 13 is provided on the upper hinge plate 11 and the upper hinge seat 21. The first bearing 13 is a sliding bearing. Optionally, as shown... Figure 10 As shown, a first bearing 13 is provided on the lower hinge plate 12 and the lower hinge seat 22. The first bearing 13 is a sliding bearing. Optionally, as shown... Figure 8 As shown, a second bearing 23 is installed on the intermediate frame 2, and the second bearing 23 is a rolling bearing. Optionally, as... Figure 11 As shown, a second bearing 23 is installed on the intermediate frame 2. The second bearing 23 is a sliding bearing.
[0042] like Figure 4 , Figure 5 and Figure 13 As shown, in this embodiment, a steering limit plate 105 is provided on the front frame 1, and a steering limit block 203 is provided on the middle frame 2. The steering limit plate 105 and the steering limit block 203 cooperate to limit the maximum turning angle α between the front frame 1 and the middle frame 2; Figure 13As shown, a steering limit groove is provided on the steering limit plate 105, and a steering limit block 203 is arranged in the steering limit groove. When the tractor is traveling horizontally, the steering limit block 203 is located in the center of the steering limit groove. When the tractor turns, the front frame 1 can swing left and right in the horizontal plane around the steering axis. When the front frame 1 swings to the left in the horizontal plane until the left side wall of the steering limit groove abuts against the steering limit block 203, the swing angle between the front frame 1 and the middle frame 2 is the maximum swing angle α. When the front frame 1 swings to the right in the horizontal plane until the right side wall of the steering limit groove abuts against the steering limit block 203, the swing angle between the front frame 1 and the middle frame 2 is also the maximum swing angle α. The maximum swing angle α is preset according to the size of the tractor, which can reduce the turning radius of the tractor as much as possible while avoiding interference between the 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 β 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°.
[0043] like Figure 1 and Figure 15 As shown, in this embodiment, the front frame 1 is provided with a front cylinder mounting seat 104 for hinged connection of the first end of the steering cylinder 4, and the middle frame 2 is provided with a rear cylinder mounting seat 201 for hinged connection of the second end of the steering cylinder 4. The steering cylinder 4 is provided with a cylinder limiting block 8 for limiting its retraction. When turning is required, the cylinder limiting block 8 is removed from the piston rod, allowing the steering cylinder 4 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 8 is installed on the piston rod of the steering cylinder 4, the retraction of the steering cylinder 4 can be limited, allowing the tractor to maintain straight-line travel. Optionally, two steering cylinders 4 are symmetrically arranged on both sides of the middle frame 2. When turning, the two steering cylinders 4 work simultaneously. One steering cylinder 4 extends to push the front frame 1 to turn, and the other steering cylinder 4 retracts to pull the front frame 1 to turn. Compared with using a single high-thrust cylinder, using two low-thrust steering cylinders 4 can reduce costs.
[0044] like Figure 4 , Figure 5 and Figure 14 As shown, in this embodiment, a swing limiting block 202 is provided on the intermediate frame 2, and a swing limiting plate 301 is provided on the rear frame 3. The swing limiting block 202 and the swing limiting plate 301 cooperate to limit the maximum swing angle β between the intermediate frame 2 and the rear frame 3; Figure 14As shown, the swing limit plate 301 has an arc-shaped limit groove, and the swing limit block 202 is arranged in the arc-shaped limit groove. When the tractor is traveling horizontally, the swing limit block 202 is in the center of the arc-shaped limit groove. When the tractor enters uneven terrain, the rear frame 3 can swing left and right in the vertical plane around the swing pin 7. When the rear frame 3 swings to the right in the vertical plane until the right side wall of the arc-shaped limit groove abuts the swing limit block 202, the swing angle between the intermediate frame 2 and the rear frame 3 is the maximum swing angle β. When the rear frame 3 swings to the left in the vertical plane until the left side wall of the arc-shaped limit groove abuts the swing limit block 202, the swing angle between the intermediate frame 2 and the rear frame 3 is also the maximum swing angle β. The maximum swing angle β is preset according to the height of the center of gravity of the rear frame off the ground, 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 3 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 3 is too small, and the tractor has poor passability on uneven terrain. Optionally, the maximum swing angle β is 11°.
[0045] In this embodiment, a power system mounting bracket 101 is provided on the front frame 1. A vibration damping device 9 for connecting the power system is provided on the power system mounting bracket 101. The vibration damping device 9 includes a first damping block 902, a first protective cover 903 disposed on the first damping block 902, a second damping block 904 symmetrically disposed with the first damping block 902, a second protective cover 905 disposed on the second damping block 904, a bolt 901, and a nut 906 adapted to the bolt 901. The bolt 901 passes sequentially through the power system bracket 100, the first protective cover 903, the first damping block 902, the second damping block 904, and the second protective cover 905. The nut 906 cooperates with the bolt 901 to clamp the first damping block 902 and the second damping block 904 together to secure the power system mounting bracket. Mounting seat 101; The power system is mounted on the power system bracket 100, which presses against the first protective cover 903. The vibration damping device 9 is mounted on the power system mounting seat 101 through the cooperation of the first damping block 902 and the second damping block 904. The power system mounting seat 101 is located on the front frame 1, which 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-end tilting. Moreover, the power system is independently arranged from the front frame 1, which is convenient for disassembly and maintenance. When the power system is working, the deformation and reset of the first damping block 902 and the second damping block 904 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.
[0046] In this embodiment, the front frame 1 is provided with a front axle mounting seat 102 and a front track wheel mounting seat 103, and the rear frame 3 is provided with a rear axle mounting seat 302 and a rear track wheel mounting seat 303. The front axle is mounted on the front frame 1 via the front axle mounting seat 102, and front wheels are mounted on the left and right sides of the front axle. The rear axle is mounted on the rear frame 3 via the rear axle mounting seat 302, and rear wheels are mounted on the left and right sides of the rear axle. The front and rear wheels are rubber pneumatic tires, suitable for highways and mountain roads. The front triangular track wheel is mounted on the front frame 1 via the front track wheel mounting seat 103 and is driven by the front axle. The rear triangular track wheel is mounted on the rear frame 3 via the rear track wheel mounting seat 303 and is driven by the rear axle. This configuration is suitable for snow, mud, sand and other road conditions.
[0047] like Figure 3 As shown, in this embodiment, the front frame 1 is equipped with a cab mounting seat 106, a first lifting lug 107, a cooling system mounting seat 108, and a front suspension system mounting seat 109. The cab mounting seat 106 is mounted on the front frame 1, ensuring that the driver's field of vision is always parallel to the direction of travel when the steering cylinder 4 drives the front frame 1 to turn. The lifting equipment lifts the front frame 1 through the first lifting lug 107, facilitating transportation and assembly. The cooling system mounting seat 108 is used to connect the radiator, which dissipates heat from the power system. The front suspension system mounting seat 109 can be equipped with a front suspension system or front counterweight as needed, and is used to connect agricultural implements that require high stability and adhesion, such as plows and harrows.
[0048] like Figure 4 As shown in this embodiment, the intermediate frame 2 is provided with a second lifting lug 204. The lifting equipment lifts the intermediate frame 2 through the second lifting lug 204, which facilitates transportation and assembly.
[0049] like Figure 5 As shown, in this embodiment, the rear frame 3 is provided with a drawbar mounting seat 304, a rear suspension system mounting seat 305, and a PTO output shaft mounting seat 306. The drawbar mounting seat 304 is used to install the drawbar, which serves as a support point to provide traction for the implements or trailers connected to the rear frame 3. The rear suspension system mounting seat 305 is used to connect implements that require high flexibility and adaptability, such as seeders and harvesters. The PTO output shaft mounting seat 306 is used to install the power take-off shaft, which provides power to the rear-mounted implements, effectively meeting the rear output requirements of the tractor.
[0050] 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 hinged steering tractor frame, characterized in that, It includes a front frame (1) for mounting the front axle and powertrain, a rear frame (3) for mounting the rear axle, an intermediate frame (2) for connecting the front frame (1) and the rear frame (3), and a slack-beam steering mechanism. The folding steering mechanism includes a steering shaft for hinged connection between the front frame (1) and the intermediate frame (2) and a steering cylinder (4) for adjusting the angle between the front frame (1) and the intermediate frame (2). The steering shaft includes an upper steering pin (5) and a lower steering pin (6) arranged coaxially and at intervals. The intermediate frame (2) is connected to the rear frame (3) through a swing pin (7). The swing pin (7) is provided with a through hole (71) coaxially. The through hole (71) is used to pass through the power transmission shaft connecting the front axle and the rear axle.
2. The folding steering tractor frame according to claim 1, characterized in that, The front frame (1) and / or the intermediate frame (2) are provided with a first bearing (13) for connecting the steering shaft, and the intermediate frame (2) and / or the rear frame (3) are provided with a second bearing (23) for connecting the swing pin (7).
3. The folding steering tractor frame according to claim 2, characterized in that, The front frame (1) is provided with an upper hinge plate (11) and a lower hinge plate (12), the middle frame (2) is provided with an upper hinge seat (21) and a lower hinge seat (22), the upper hinge plate (11) and the lower hinge plate (12) are respectively provided with a first bearing (13), the upper steering pin (5) is provided on the upper hinge seat (21) and connected to the first bearing (13) on the upper hinge plate (11), and the lower steering pin (6) is provided on the lower hinge seat (22) and connected to the first bearing (13) on the lower hinge plate (12).
4. The folding steering tractor frame according to any one of claims 1 to 3, characterized in that, A steering limit plate (105) is provided on the front frame (1), and a steering limit block (203) is provided on the intermediate frame (2). The steering limit plate (105) and the steering limit block (203) cooperate to limit the maximum turning angle of the front frame (1) and the intermediate frame (2).
5. The folding steering tractor frame according to any one of claims 1 to 3, characterized in that, The front frame (1) is provided with a cylinder front mounting seat (104) for hinged to the first end of the steering cylinder (4), the middle frame (2) is provided with a cylinder rear mounting seat (201) for hinged to the second end of the steering cylinder (4), and the steering cylinder (4) is provided with a cylinder limit block (8) for limiting its retraction.
6. The folding steering tractor frame according to any one of claims 1 to 3, characterized in that, A swing limiting block (202) is provided on the intermediate frame (2), and a swing limiting plate (301) is provided on the rear frame (3). The swing limiting block (202) and the swing limiting plate (301) cooperate to limit the maximum swing angle of the intermediate frame (2) and the rear frame (3).
7. The folding steering tractor frame according to any one of claims 1 to 3, characterized in that, The front frame (1) is provided with a power system mounting bracket (101), and the power system mounting bracket (101) is provided with a vibration damping device (9) for connecting the power system. The vibration damping device (9) includes a first damping block (902), a first protective cover (903) provided on the first damping block (902), a second damping block (904) symmetrically provided with the first damping block (902), and a second protective cover (905) provided on the second damping block (904). The bolt (901) and the nut (906) adapted to the bolt (901) are provided. The bolt (901) passes through the power system bracket, the first protective cover (903), the first damping block (902), the second damping block (904) and the second protective cover (905) in sequence. The nut (906) cooperates with the bolt (901) so that the first damping block (902) and the second damping block (904) clamp the power system mounting base (101).
8. The folding steering tractor frame according to any one of claims 1 to 3, characterized in that, The front frame (1) is provided with a front axle mounting seat (102) and / or a front track wheel mounting seat (103), and the rear frame (3) is provided with a rear axle mounting seat (302) and / or a rear track wheel mounting seat (303).
9. The folding steering tractor frame according to any one of claims 1 to 3, characterized in that, The front frame (1) is provided with a cab mounting seat (106), a first lifting lug (107), a cooling system mounting seat (108), and a front suspension system mounting seat (109).
10. The folding steering tractor frame according to any one of claims 1 to 3, characterized in that, The rear frame (3) is provided with a traction rod mounting seat (304), a rear suspension system mounting seat (305), and a PTO output shaft mounting seat (306).