Frame type bowing steering tractor frame

Abstract

The utility model discloses a frame type bowing steering tractor frame, which comprises a front frame, a rear frame, a steering shaft and a steering oil cylinder, wherein the front frame is used for mounting a front axle and a power system; the rear frame is used for mounting a rear axle; the steering shaft is used for hinging the front frame and the rear frame; the front frame is hinged to a swing frame used for being connected with a front axle through a swing pin shaft, or the rear frame is hinged to a swing frame used for being connected with a rear axle through a swing pin shaft. The swing pin shaft and the steering shaft are vertically arranged; according to the frame type bowing steering tractor frame, the swing frame is located at the bottom of the front frame body or the rear frame body, the length of the whole tractor can be effectively shortened, the minimum turning radius is reduced, the situation that a single wheel leaves the ground when the tractor runs on uneven terrains can be reduced, the tractor is made to adapt to the complex terrains of hills and mountains, and the tractor is more convenient to use. And the trafficability of the tractor on a non-flat operation road surface 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 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. To improve the passability of pin-type articulated steering tractors on uneven terrain, relative swinging between the front and rear bodies in the vertical plane is required. Existing pin-type articulated steering tractors connect the front and rear bodies with a swing pin. The overall length of the tractor inevitably increases due to the integration of the swing pin, leading to an increase in the minimum turning radius. Therefore, there is still room for optimization of the minimum turning radius of pin-type articulated steering tractors. Utility Model Content

[0005] This utility model provides a frame-type folding steering tractor frame to solve the technical problem that the minimum turning radius of the existing pin-type folding steering still has room for optimization.

[0006] According to one aspect of the present invention, a frame-type articulated steering tractor chassis is provided, comprising a front frame for mounting the front axle and power system, a rear frame for mounting the rear axle, a steering shaft for hinged between the front frame and the rear frame, and a steering cylinder for adjusting the angle between the front frame and the rear frame; the front frame is hinged to a swing bracket for connecting the front axle via a swing pin, or the rear frame is hinged to a swing bracket for connecting the rear axle via a swing pin; the swing pin is arranged perpendicularly to the steering shaft.

[0007] Furthermore, the swing frame includes a first hinge seat for connecting the front frame, a swing beam hinged to the first hinge seat via the swing pin, and an axle mounting seat for connecting the front axle arranged on the swing beam.

[0008] Alternatively, the swing frame may include a first hinge seat for connecting the rear frame, a swing beam hinged to the first hinge seat via the swing pin, and an axle mounting bracket for connecting the rear axle disposed on the swing beam.

[0009] Furthermore, a swing limiting plate is provided on the front frame, which is used to abut against the swing beam to limit the maximum swing angle of the swing beam relative to the front frame.

[0010] Furthermore, a swing limiting plate is provided on the rear frame, which is used to abut against the swing beam to limit the maximum swing angle of the swing beam relative to the rear frame.

[0011] Furthermore, the front frame and / or the rear frame are provided with a first bearing for connecting the steering shaft.

[0012] Furthermore, the steering shaft includes an upper steering pin and a lower steering pin arranged coaxially and at intervals. An upper hinge plate and a lower hinge plate are arranged on the front frame, and an upper hinge seat and a lower hinge seat are arranged on the rear frame. A first bearing is arranged on the upper hinge plate and the lower hinge plate respectively. The upper steering pin is arranged on the upper hinge seat and connected to the first bearing on the upper hinge plate. The lower steering pin is arranged on the lower hinge seat and connected to the first bearing on the lower hinge plate.

[0013] Furthermore, a steering limit block is provided on the rear frame, and a steering limit plate is provided on the front frame. The steering limit plate and the steering limit block cooperate to limit the maximum turning angle of the front frame and the rear frame.

[0014] Furthermore, it also includes a steering locking rod for rigidly connecting the front frame and the rear frame to limit the retraction of the steering cylinder, one end of the steering locking rod being detachably connected to the front frame and the other end of the steering locking rod being detachably connected to the rear frame.

[0015] Furthermore, the front frame is equipped with a front suspension system mounting bracket, a cooling system mounting bracket, a first lifting lug, a power system mounting bracket, and a cab mounting bracket.

[0016] Furthermore, the rear frame is equipped with a rear suspension system mounting bracket and a PTO output shaft mounting bracket.

[0017] This utility model has the following beneficial effects:

[0018] This utility model relates to a frame-type articulated steering tractor chassis, primarily used in high-horsepower tractors. The front frame has a front mounting seat for hinged steering cylinders at the first end, and the rear frame has a rear mounting seat for hinged steering cylinders at the second end. The front and rear frames are hinged together via 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 cylinders, effectively reducing the minimum turning radius. A swing arm is located at the bottom of either the front or rear frame, with the front or rear axle mounted on it. The swing arm is hinged to the front or rear frame via a swing pin, allowing the front or rear axle to swing left and right in the vertical plane around the swing pin. This not only effectively shortens the overall vehicle length and further reduces the minimum turning radius, but also reduces the occurrence of individual wheels leaving the ground when the tractor travels on uneven terrain, enabling the tractor to adapt to complex hilly and mountainous terrain and significantly improving its passability on uneven working surfaces.

[0019] 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

[0020] 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:

[0021] Figure 1 This is a schematic diagram of the frame-type folding steering tractor frame of a preferred embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of the steering shaft according to a preferred embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the front frame structure of a preferred embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of the swing frame according to a preferred embodiment of the present invention;

[0025] Figure 5 This is a structural schematic diagram of the maximum swing angle of a preferred embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the rear frame structure of a preferred embodiment of the present invention;

[0027] Figure 7 This is one of the structural schematic diagrams of the upper hinge plate in a preferred embodiment of the present utility model;

[0028] Figure 8This is one of the structural schematic diagrams of the lower hinge plate of a preferred embodiment of this utility model;

[0029] Figure 9 This is a second schematic diagram of the upper hinge plate in a preferred embodiment of the present invention;

[0030] Figure 10 This is the second schematic diagram of the structure of the lower hinge plate in a preferred embodiment of this utility model;

[0031] Figure 11 This is a structural schematic diagram of the maximum turning angle of a preferred embodiment of the present invention;

[0032] Figure 12 This is a schematic diagram of the structure of the steering limit plate according to a preferred embodiment of the present invention;

[0033] Figure 13 This is a schematic diagram of the steering locking rod according to a preferred embodiment of the present invention.

[0034] Legend:

[0035] 1. Front frame; 11. Upper hinge plate; 12. Lower hinge plate; 13. First bearing; 101. Hydraulic cylinder front mounting seat; 102. Connecting seat; 103. Steering limit plate; 104. Front suspension system mounting seat; 105. Cooling system mounting seat; 106. First lifting lug; 107. Power system mounting seat; 108. Cab mounting seat; 109. Swing limit plate; 2. Rear frame; 21. Upper hinge plate; 22. Lower... 201. Rear mounting bracket for hydraulic cylinder; 202. Steering limit block; 203. Rear axle mounting bracket; 204. Rear suspension system mounting bracket; 205. PTO output shaft mounting bracket; 206. Second hinge bracket; 3. Steering cylinder; 4. Upper steering pin; 5. Lower steering pin; 6. Swing frame; 603. First hinge bracket; 601. Swing beam; 602. Axle mounting bracket; 7. Swing pin; 8. Steering lock rod. Detailed Implementation

[0036] 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.

[0037] Please refer to the following: Figures 1 to 13 The frame-type folding steering tractor frame of this embodiment includes a front frame 1 for mounting the front axle and power system, a rear frame 2 for mounting the rear axle, a steering shaft for hinged between the front frame 1 and the rear frame 2, and a steering cylinder 3 for adjusting the angle between the front frame 1 and the rear frame 2; the front frame 1 is hinged to a swing bracket 6 for connecting the front axle via a swing pin 7, or the rear frame 2 is hinged to a swing bracket 6 for connecting the rear axle via a swing pin 7; the swing pin 7 is arranged perpendicular to the steering shaft.

[0038] The frame-type articulated steering tractor chassis of this embodiment is mainly used in high-horsepower tractors. The front frame 1 is equipped with a front cylinder mounting seat 101 for hinged connection of the first end of the steering cylinder 3, and the rear frame 2 is equipped with a rear cylinder mounting seat 201 for hinged connection of the second end of the steering cylinder 3. The front frame 1 and the rear 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 3, effectively reducing the minimum turning radius. A swing frame 6 is located at the bottom of the front frame 1 or the rear frame 2, and the front axle or rear axle is mounted on the swing frame 6. The swing frame 6 is hinged to the front frame 1 or the rear frame 2 by a swing pin 7, allowing the front axle or rear axle to swing left and right in the vertical plane around the swing pin 7. This not only effectively shortens the overall vehicle length and further reduces the minimum turning radius, but also reduces the occurrence of a single wheel leaving the ground when the tractor travels on uneven terrain, enabling the tractor to adapt to complex terrain such as hills and mountains, and significantly improving the tractor's passability on uneven working surfaces. Optionally, as... Figure 11 As shown, two steering cylinders 3 are symmetrically arranged on both sides of the frame. When turning, the two steering cylinders 3 work at the same time. One steering cylinder 3 extends to push the front frame 1 to turn, and the other steering cylinder 3 retracts to pull the front frame 1 to turn. Compared with using a single high-thrust cylinder, using two low-thrust steering cylinders 3 can reduce costs.

[0039] like Figure 3 , Figure 4 and Figure 6 As shown, in this embodiment, the swing frame 6 includes a first hinge seat 603 for connecting the front frame 1, a swing beam 601 hinged to the first hinge seat 603 via a swing pin 7, and an axle mounting seat 602 for connecting the front axle arranged on the swing beam 601. A rear axle mounting seat 203 is fixedly installed on the rear frame 2. The first hinge seat 603 is installed on the front frame 1, and two swing beams 601 are arranged on the axle mounting seat 602. The swing pin 7 passes through the through hole of the swing beam 601 and is hinged to the first hinge seat 603, so that the axle mounting seat 602 can drive the front axle to swing around the swing pin 7 in the vertical plane. This can reduce the occurrence of a single wheel leaving the ground when the tractor is driving on uneven terrain, reduce bumps during driving, thereby reducing wear on parts and extending service life.

[0040] like Figure 4 and Figure 5As shown, in this embodiment, a swing limiting plate 109 is provided on the front frame 1. The swing limiting plate 109 is used to abut against the swing crossbeam 601 to limit the maximum swing angle β of the swing crossbeam 601 relative to the front frame 1. The two swing limiting plates 109 are respectively arranged on both sides of the swing crossbeam 601. When the tractor is traveling horizontally, the swing crossbeam 601 is in a horizontal state. When the tractor enters uneven terrain, the swing crossbeam 601 can swing the swing pin 7 left and right in the vertical plane, such as... Figure 5 As shown, when the swing beam 601 swings to the right in the vertical plane until its left side abuts against the left swing limit plate 109, the swing angle of the front axle driven by the swing beam 601 is the maximum swing angle β. When the swing beam 601 swings to the left in the vertical plane until its right side abuts against the right swing limit plate 109, the swing angle of the front axle driven by the swing beam 601 is also the maximum swing angle β. The maximum swing angle β is preset according to the center of gravity height of the front 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 swing frame 6 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 swing frame 6 is too small, resulting in poor passability of the tractor on uneven terrain. Optionally, the maximum swing angle β is 11°.

[0041] In this embodiment, the swing frame 6 includes a first hinge seat 603 for connecting the rear frame 2, a swing beam 601 hinged to the first hinge seat 603 via a swing pin 7, and an axle mounting seat 602 for connecting the rear axle arranged on the swing beam 601. A swing limiting plate 109 is arranged on the rear frame 2, which abuts against the swing beam 601 to limit the maximum swing angle of the swing beam 601 relative to the rear frame 2. A front axle mounting seat is fixedly installed on the front frame 1. The first hinge seat 603 is installed on the rear frame 2. Two swing beams 601 are arranged on the axle mounting seat 602. The swing pin 7 passes through the through hole of the swing beam 601 and is hinged to the first hinge seat 603, so that the axle mounting seat 602 can drive the rear axle to swing around the swing pin 7 in the vertical plane. This can reduce the occurrence of a single wheel leaving the ground when the tractor is driving on uneven terrain, reduce bumps during driving, thereby reducing wear on parts and extending service life.

[0042] In this embodiment, a first bearing 13 for connecting the steering shaft is provided on the front frame 1 and / or the rear frame 2. The first bearing 13 can reduce frictional resistance during steering and extend the service life of the frame. Optionally, the first bearing 13 is a rolling bearing. Rolling bearings have low frictional resistance, which can reduce the frictional resistance of the front frame 1 relative to the rear frame 2 during steering. Optionally, the first bearing 13 is a sliding bearing. Sliding bearings have a large bearing area, are buffered by a lubricating oil film, and have stronger impact resistance, making them 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 rear frame 2 to arch upwards, which can improve the tractor's passability on rugged roads in hilly and mountainous areas.

[0043] like Figure 2 , Figure 3 and Figure 6 As shown, in this embodiment, the steering shaft includes an upper steering pin 4 and a lower steering pin 5 arranged coaxially and at intervals. An upper hinge plate 11 and a lower hinge plate 12 are arranged on the front frame 1, and an upper hinge seat 21 and a lower hinge seat 22 are arranged on the rear frame 2. First bearings 13 are respectively arranged on the upper hinge plate 11 and the lower hinge plate 12. The upper steering pin 4 is arranged on the upper hinge seat 21 and connected to the first bearing 13 on the upper hinge plate 11. The lower steering pin 5 is arranged on the lower hinge seat 22 and connected to the first bearing 13 on the lower hinge plate 12. Compared with using a single long shaft, two short pins (upper steering pin 4 and lower steering pin 5) can reduce the weight of the steering shaft and provide clearance for the drive shaft, allowing the drive shaft to pass between the upper steering pin 4 and the lower steering pin 5, thereby achieving four-wheel drive and improving the tractor's passability on rugged roads in hilly and mountainous areas. Optionally, as... Figure 6 and Figure 7 As shown, the first bearing 13 is a rolling bearing, which is mounted on the upper hinge plate 11. The upper steering pin 4 is mounted on the upper hinge seat 21 and hinged to the upper hinge plate 11 via the rolling bearing. The rolling bearing has low frictional resistance, which can reduce the frictional resistance of the front frame 1 relative to the rear frame 2 during steering. Optionally, as... Figure 6 and Figure 8 As shown, the first bearing 13 is a rolling bearing, which is mounted on the lower hinge plate 12. The lower steering pin 5 is mounted on the lower hinge seat 22 and hinged to the lower hinge plate 12 via the rolling bearing. The rolling bearing has low frictional resistance, which can reduce the frictional resistance of the front frame 1 relative to the rear frame 2 during steering. Optionally, as... Figure 9 As shown, the first bearing 13 is a sliding bearing. Two sliding bearings are respectively mounted on the upper hinge seat 21 and the upper hinge plate 11. The upper steering pin 4 is hinged to the upper hinge seat 21 and the upper hinge plate 11 via the sliding bearings. The 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, such as... Figure 10 As shown, the first bearing 13 is a sliding bearing. Three sliding bearings are respectively arranged on the lower hinge plate 12 and the lower hinge seat 22. The lower steering pin 5 is hinged to the lower hinge plate 12 and the lower hinge seat 22 through the sliding bearings. 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 first bearing 13 is a spherical plain bearing. The outer ring of one spherical plain bearing is connected to the upper hinge plate 11, and the inner ring of the spherical plain bearing is connected to the upper steering pin 4; the outer ring of another spherical plain bearing is connected to the lower hinge plate 12, and the inner ring of the spherical plain bearing is connected to the lower steering pin 5. The spherical plain bearing can not only hinge the front frame 1 and the rear frame 2, but also allow the steering shaft to have a certain amount of sway space relative to the front frame 1, so that the connection between the front frame 1 and the rear frame 2 can be arched upward, which can improve the tractor's passability on rugged roads in hilly and mountainous areas.

[0044] like Figure 3 , Figure 6 , Figure 11 and Figure 12As shown, in this embodiment, a steering limit block 202 is provided on the rear frame 2, and a steering limit plate 103 is provided on the front frame 1. The steering limit plate 103 and the steering limit block 202 cooperate to limit the maximum turning angle α of the front frame 1 and the rear frame 2. It can be understood that a steering limit block 202 can also be provided on the front frame 1, and a steering limit plate 103 can be provided on the rear frame 2, which can also limit the maximum turning angle α of the front frame 1 and the rear frame 2, and prevent the tractor from over-steering. Two steering limit blocks 202 are symmetrically arranged on both sides of the rear frame 2. When the tractor is traveling horizontally, the two steering limit blocks 202 are symmetrical about the axis of the steering limit plate 103. When the tractor turns, the steering shaft of the front frame 1 can swing left and right in the horizontal plane. When the front frame 1 swings to the left in the horizontal plane, it continues until the left side wall of the steering limit plate 103 abuts against the left steering limit block 202. At this time, the swing angle between the front frame 1 and the rear frame 2 is the maximum swing angle α. When the front frame 1 swings to the right in the horizontal plane, it continues until the right side wall of the steering limit plate 103 abuts against the right steering limit block 202. At this time, the swing angle between the front frame 1 and the rear 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°. Optionally, the steering limit plate 103 is mounted on the lower hinge plate 12 or the upper hinge plate 11. The position of the steering limit block 202 is adjusted accordingly so that the steering limit block 202 corresponds to the steering limit plate 103, which can accommodate different models of tractors.

[0045] like Figure 11 and Figure 13 As shown, in this embodiment, the frame-type folding steering tractor frame also includes a steering locking rod 8 for rigidly connecting the front frame 1 and the rear frame 2 to restrict the retraction of the steering cylinder 3. One end of the steering locking rod 8 is detachably connected to the front frame 1, and the other end is detachably connected to the rear frame 2. When turning is required, the steering locking rod 8 is removed, allowing the steering cylinder 3 to extend and retract freely, enabling the tractor to smoothly complete the turning / U-turn action. After the tractor turns / U-turns, connecting both ends of the steering locking rod 8 to the front frame 1 and the rear frame 2 restricts the retraction of the steering cylinder 3, allowing the tractor to maintain straight-line travel. Optionally, as... Figure 11As shown, a connecting seat 102 is provided on the front frame 1, and the connecting seat 102 is connected to the steering lock rod 8 by a pin. A second hinge seat 206 is provided on the rear frame 2, and the steering lock rod 8 is hinged to the second hinge seat 206 by bolts. In use, the rigid connection between the front frame 1 and the rear frame 2 can be achieved by inserting and removing the pin. The structure is simple, the operation is convenient, and there is no need to specially store the steering lock rod 8.

[0046] like Figure 3 As shown, in this embodiment, the front frame 1 is equipped with a front suspension system mounting seat 104, a cooling system mounting seat 105, a first lifting lug 106, a power system mounting seat 107, and a cab mounting seat 108. The front suspension system mounting seat 104 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. The cooling system mounting seat 105 is used to connect a radiator, which dissipates heat from the power system. The lifting equipment lifts the front frame 1 through the first lifting lug 106, which facilitates transportation and assembly. The power system mounting seat 107 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, and can effectively prevent wheelies. The cab is mounted on the front frame 1 through the cab mounting seat 108. When the steering cylinder 3 drives the front frame 1 to turn, it can ensure that the driver's field of vision is always parallel to the direction of travel.

[0047] like Figure 6 As shown in this embodiment, the rear frame 2 is provided with a rear suspension system mounting seat 204 and a PTO output shaft mounting seat 205; the rear suspension system mounting seat 204 is used to connect agricultural implements that require high flexibility and adaptability, such as seeders and harvesters; the PTO output shaft mounting seat 205 is used to install a power output shaft, which provides power to the rear-mounted agricultural implements through the power output shaft, effectively meeting the rear output requirements of the tractor.

[0048] 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 knee-turning steering tractor vehicle frame, characterized in that, it comprises a front frame (1) for mounting a front axle and a power system, a rear frame (2) for mounting a rear axle, a steering shaft for hinging the front frame (1) and the rear frame (2), and a steering cylinder (3) for adjusting the angle between the front frame (1) and the rear frame (2); the front frame (1) is hinged with a swing frame (6) for connecting a front axle via a swing pin shaft (7), or the rear frame (2) is hinged with a swing frame (6) for connecting a rear axle via a swing pin shaft (7); the swing pin shaft (7) is arranged perpendicular to the steering shaft.

2. The frame type knee-turning steering tractor vehicle frame according to claim 1, characterized in that, the swing frame (6) comprises a first hinge seat (603) for connecting the front frame (1), a swing crossbeam (601) hinged with the first hinge seat (603) via the swing pin shaft (7), and an axle mounting seat (602) arranged on the swing crossbeam (601) for connecting a front axle; or, the swing frame (6) comprises a first hinge seat (603) for connecting the rear frame (2), a swing crossbeam (601) hinged with the first hinge seat (603) via the swing pin shaft (7), and an axle mounting seat (602) arranged on the swing crossbeam (601) for connecting a rear axle.

3. The frame type knee-turning steering tractor vehicle frame according to claim 2, characterized in that, a swing limiting plate (109) is arranged on the front frame (1), and the swing limiting plate (109) is used for abutting against the swing crossbeam (601) to limit the maximum swing angle of the swing crossbeam (601) relative to the front frame (1).

4. The frame type knee-turning steering tractor vehicle frame according to claim 2, characterized in that, a swing limiting plate (109) is arranged on the rear frame (2), and the swing limiting plate (109) is used for abutting against the swing crossbeam (601) to limit the maximum swing angle of the swing crossbeam (601) relative to the rear frame (2).

5. The frame type knee-turning steering tractor vehicle frame according to any one of claims 1 to 4, characterized in that, a first bearing (13) for connecting the steering shaft is arranged on the front frame (1) and / or the rear frame (2).

6. The frame type knee-turning steering tractor vehicle frame according to claim 5, characterized in that, The turning shaft comprises coaxial and spaced upper turning pin shaft (4) and lower turning pin shaft (5), the front frame (1) is provided with upper hinge plate (11) and lower hinge plate (12), the rear frame (2) is provided with upper hinge seat (21) and lower hinge seat (22), the upper hinge plate (11) and the lower hinge plate (12) are respectively provided with first bearing (13), the upper turning pin shaft (4) is arranged on the upper hinge seat (21) and connected with the first bearing (13) on the upper hinge plate (11), the lower turning pin shaft (5) is arranged on the lower hinge seat (22) and connected with the first bearing (13) on the lower hinge plate (12).

7. The frame type knee bending turning tractor vehicle frame according to claim 6, characterized in that, The rear frame (2) is provided with turning limiting block (202), the front frame (1) is provided with turning limiting plate (103), the turning limiting plate (103) and the turning limiting block (202) cooperate to limit the maximum turning angle of the front frame (1) and the rear frame (2).

8. The frame type knee bending turning tractor vehicle frame according to claim 1, characterized in that, It further comprises turning locking rod (8) for rigidly connecting the front frame (1) and the rear frame (2) to limit the contraction of the turning oil cylinder (3), one end of the turning locking rod (8) is detachably connected with the front frame (1), the other end of the turning locking rod (8) is detachably connected with the rear frame (2).

9. The frame type knee bending turning tractor vehicle frame according to claim 1, characterized in that, The front frame (1) is provided with front suspension system mounting seat (104), heat dissipation system mounting seat (105), first lifting lug (106), power system mounting seat (107) and cab mounting seat (108).

10. The frame type knee bending turning tractor vehicle frame according to claim 1, characterized in that, The rear frame (2) is provided with rear suspension system mounting seat (204) and PTO output shaft mounting seat (205).

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