Bowing steering tractor chassis
By improving the tractor chassis structure, optimizing the turning radius using steering cylinders and swing pins, and combining it with vibration damping devices, the problems of large turning radius and vibration of tractors on complex terrain were solved, improving passability and service life.
Patent Information
- Application Number
- CN202520460848.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-17
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-03-17
AI Technical Summary
Existing articulated steering tractors have a large turning radius when driving on complex terrains such as hills and mountains, which leads to resonance and humming in the cab, increased wear on mechanical parts, and shortened service life.
It adopts a flex steering tractor chassis structure, including a flex steering frame, power system, front axle and rear axle. The relative swing of the front frame and rear frame is achieved by steering cylinder and swing pin. Combined with vibration damping device, vibration is isolated, turning radius is optimized and bumps are reduced.
It effectively reduces the minimum turning radius of the tractor, improves its passability in complex terrain, reduces wear on mechanical parts, improves the driver's working environment, and reduces noise and vibration.
Smart Images
Figure CN223891056U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of agricultural machinery technology, and in particular, to a chassis for a folding steering tractor. 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.
[0005] In addition, hilly and mountainous terrain is complex, usually with large slopes and uneven terrain. When traditional tractors travel on such roads, the vibration of the power system and the bumps of the chassis can easily cause resonance and humming in the cab, making the driver's working environment harsh and even affecting the driver's operation. On the other hand, it can also cause accelerated wear and tear on mechanical parts and shorten their service life. Utility Model Content
[0006] This utility model provides a chassis for a slack-steering tractor to solve the technical problems of existing slack-steering tractors having a large minimum turning radius. When driving on complex terrain such as hilly areas, the vibration of the power system combined with the bumps of the chassis can easily cause resonance and humming in the cab, leading to accelerated wear of mechanical parts and shortened service life.
[0007] According to one aspect of the present invention, a hinged steering tractor chassis is provided, including a hinged steering frame. A power system, a front axle, and a rear axle are mounted on the hinged steering frame. The power system simultaneously drives the front axle and the rear axle via a transmission mechanism. The hinged steering frame includes a front frame, a rear frame, a steering pin for hinged connection between the front frame and the rear frame, a swing arm, a sway pin, and a steering cylinder for adjusting the angle between the front frame and the rear frame. The sway pin is perpendicular to the steering pin. The power system is connected to the hinged steering frame via a vibration damping device. The front axle is mounted on the swing arm, and the front frame and the swing arm are hinged via the sway pin; alternatively, the rear axle is mounted on the swing arm, and the rear frame and the swing arm are hinged via the sway pin.
[0008] 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; a swing limiting plate is arranged on the front frame, and the swing limiting plate is used to abut against the swing beam to limit the maximum swing angle of the swing beam relative to the front frame.
[0009] Furthermore, the swing frame includes 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 seat for connecting the rear axle arranged on the swing beam. A swing limiting plate is arranged on the rear frame, and the swing limiting plate is used to abut against the swing beam to limit the maximum swing angle of the swing beam relative to the rear frame.
[0010] Furthermore, 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 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, and the power system presses against the first protective cover.
[0011] Furthermore, the power system includes an engine, a gear shifter, a first driveshaft, and a four-wheel drive transfer case. The power output end of the engine is connected to the input end of the gear shifter, and the output end of the gear shifter is connected to the input end of the four-wheel drive transfer case via the first driveshaft. The four-wheel drive transfer case drives the front axle and the rear axle simultaneously through the transmission mechanism. The engine and / or the four-wheel drive transfer case are connected to the front frame through the shock absorption device.
[0012] Furthermore, the transmission mechanism includes a second drive shaft, a drive shaft transition seat, a third drive shaft, and a fourth drive shaft. The front output end of the four-wheel drive transfer case is connected to the input end of the front axle via the fourth drive shaft. The rear output end of the four-wheel drive transfer case is connected to the input end of the rear axle via the second drive shaft, the drive shaft transition seat, and the third drive shaft. The drive shaft transition seat is mounted on the rear frame. The flange end faces at both ends of the second drive shaft are equidistant from the steering pin shaft.
[0013] Furthermore, the front frame and / or the rear frame are provided with a first bearing for connecting the steering pin.
[0014] Furthermore, the two steering pins are coaxial and spaced apart. The front frame is provided with an upper hinge plate and a lower hinge plate, and the rear 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. One steering pin is provided on the upper hinge seat and connected to the first bearing on the upper hinge plate, and the other steering pin is provided on the lower hinge seat and connected to the first bearing on the lower hinge plate.
[0015] 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.
[0016] 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.
[0017] This utility model has the following beneficial effects:
[0018] This utility model relates to a hinged steering tractor chassis, primarily used in high-horsepower tractors. One end of the steering cylinder is hinged to the front cylinder mounting seat on the front frame, and the other end is hinged to the rear cylinder mounting seat on the rear frame. The front and rear frames are hinged together by a steering pin, allowing the front frame to swing left and right in the horizontal plane around the steering pin under the drive of the steering cylinder.
[0019] Effectively reducing the minimum turning radius; the swing frame is located at the bottom of the front frame, and the front axle is mounted on the swing frame. The swing frame is hinged to the front frame through a swing pin, allowing the front axle to swing left and right in the vertical plane around the swing pin. This not only effectively shortens the overall length of the vehicle and further reduces the minimum turning radius, but also reduces the occurrence of a single wheel leaving the ground when the tractor is traveling on uneven terrain. This allows the tractor to adapt to complex terrains such as hills and mountains, and significantly improves the tractor's passability on uneven working roads. The power system is connected to the frame through a vibration damping device, which can effectively isolate the vibration of the chassis and power transmission system of the tractor with a bendable steering mechanism, reduce bumps during driving, and avoid cab resonance. On the one hand, this reduces the wear of mechanical parts and extends their service life; on the other hand, it reduces noise and avoids vibration affecting the driver, providing the driver with a good working environment.
[0020] 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
[0021] 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:
[0022] Figure 1 This is a schematic diagram of the structure of a folding steering tractor chassis according to a preferred embodiment of the present invention;
[0023] Figure 2 This is a schematic diagram of the power system of a preferred embodiment of the present invention;
[0024] Figure 3 This is a schematic diagram of the front frame structure of a preferred embodiment of the present invention;
[0025] Figure 4 This is a schematic diagram of the structure of the swing frame according to a preferred embodiment of the present invention;
[0026] Figure 5 This is a structural schematic diagram of the maximum swing angle of a preferred embodiment of the present invention;
[0027] Figure 6 This is a schematic diagram of the rear frame structure of a preferred embodiment of the present invention;
[0028] Figure 7 This is one of the structural schematic diagrams of the upper hinge plate in a preferred embodiment of the present utility model;
[0029] Figure 8 This is one of the structural schematic diagrams of the lower hinge plate of a preferred embodiment of this utility model;
[0030] Figure 9 This is a second schematic diagram of the upper hinge plate in a preferred embodiment of the present invention;
[0031] Figure 10 This is the second schematic diagram of the structure of the lower hinge plate in a preferred embodiment of this utility model;
[0032] Figure 11 This is a structural schematic diagram of the maximum turning angle of a preferred embodiment of the present invention;
[0033] Figure 12 This is a schematic diagram of the transmission mechanism of a preferred embodiment of the present invention;
[0034] Figure 13 This is a schematic diagram of the structure of the steering limit block according to a preferred embodiment of the present invention;
[0035] Figure 14 This is a schematic diagram of the steering lock rod according to a preferred embodiment of the present invention;
[0036] Figure 15 This is a schematic diagram of the vibration damping device according to a preferred embodiment of the present invention.
[0037] Legend:
[0038] 1. Engine; 2. Gear Shifter; 3. First Driveshaft; 4. Four-Wheel Drive Transfer Case; 5. Second Driveshaft; 6. Driveshaft Transition Seat; 7. Third Driveshaft; 8. Rear Axle; 9. Rear Wheel; 10. Fourth Driveshaft; 11. Front Axle; 12. Front Wheel; 13. Elbow Steering Frame; 1301. Front Frame; 1302. Rear Frame; 1303. Steering Pin; 1304. Swing Pin; 1305.
[0039] 1306. Axle mounting bracket; 1307. First hinge seat; 1308. Steering cylinder; 1309. Swing limit plate; 1310. Swing crossbeam; 1311. Steering lock rod; 1312. Upper hinge plate; 1313. Lower hinge plate; 1314. Upper hinge seat; 1315. Lower hinge seat; 1316. First bearing; 1317. Steering limit block; 1318. Steering limit plate; 1319. 1320. Cab mounting bracket; 1321. Engine mounting bracket; 1322. Four-wheel drive transfer case mounting bracket; 1323. Front cylinder mounting bracket; 1324. Rear cylinder mounting bracket; 1325. Connecting bracket; 1326. Second hinge bracket; 14. Vibration damping device; 1401. Bolt; 1402. First vibration damping block; 1403. First protective cover; 1404. Second vibration damping block; 1405. Second protective cover; 1406. Nut. Detailed Implementation
[0040] 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.
[0041] Please refer to the following: Figures 1 to 15 The folding steering tractor chassis of this embodiment includes a folding steering frame 13. The folding steering frame 13 is equipped with a power system, a front axle 11, and a rear axle 8. The power system drives the front axle 11 and the rear axle 8 simultaneously through a transmission mechanism. The folding steering frame 13 includes a front frame 1301, a rear frame 1302, a steering pin 1303 for hinged between the front frame 1301 and the rear frame 1302, a swing frame 1305, a swing pin 1304, and a steering cylinder 1308 for adjusting the angle between the front frame 1301 and the rear frame 1302. The swing pin 1304 is arranged perpendicularly to the steering pin 1303. The power system is connected to the folding steering frame 13 through a vibration damping device 14. The front axle 11 is mounted on the swing frame 1305, and the front frame 1301 and the swing frame 1305 are hinged through the swing pin 1304.
[0042] The folding steering tractor chassis of this embodiment is mainly used in high-horsepower tractors. The front axle 11 has a front wheel 12, and the rear axle 8 has a rear wheel 9. One end of the steering cylinder 1308 is hinged to the front cylinder mounting seat 1322 on the front frame 1301, and the other end is hinged to the rear cylinder mounting seat 1323 on the rear frame 1302. The front frame 1301 and the rear frame 1302 are hinged together by a steering pin 1303, allowing the front frame 1301 to swing left and right in the horizontal plane around the steering pin 1303 under the drive of the steering cylinder 1308, effectively reducing the minimum turning radius. The swing frame 1305 is located at the bottom of the front frame 1301, and the front axle is mounted on the swing frame 1305. The swing frame 1305 is connected to the front frame 1301 by a swing pin 1304. The 301 articulation allows the front axle 11 to swing left and right in the vertical plane around the swing pin 1304. This not only effectively shortens the overall length of the vehicle and further reduces the minimum turning radius, but also reduces the occurrence of a single wheel leaving the ground when the tractor is traveling on uneven terrain. This allows the tractor to adapt to complex terrains such as hills and mountains, significantly improving its passability on uneven working surfaces. The power system is connected to the articulated steering frame 13 through the vibration damping device 14, which effectively isolates the vibration between the articulated steering tractor chassis and the power system, reducing bumps during driving and preventing resonance in the cab 4. On the one hand, this reduces wear on mechanical parts and extends their service life; on the other hand, it reduces noise and prevents vibration from affecting the driver, providing a good working environment for the driver. Optionally, such as Figure 11As shown, two steering cylinders 1308 are symmetrically arranged on both sides of the folding steering frame 13. When turning, the two steering cylinders 1308 work simultaneously. One steering cylinder 1308 extends to push the front frame 1301 to turn, and the other steering cylinder 1308 retracts to pull the front frame 1301 to turn. Compared with using a single high-thrust cylinder, using two low-thrust steering cylinders 1308 can reduce costs. Optionally, the rear axle 8 is mounted on the swing frame 1305. The rear frame 1302 and the swing frame 1305 are hinged together by a swing pin 1304, which can also reduce the occurrence of a single wheel leaving the ground when the tractor is traveling on uneven terrain. If the swing frame 1305 is installed on both the front frame 1301 and the rear frame 1302, the swing amplitude of the front frame 1301 and the rear frame 1302 will be too large, which will easily cause the tractor to overturn. Therefore, only one of the front frame 1301 and the rear frame 1302 is selected to install the swing frame 1305. Optionally, a cab mounting seat 1319 is provided on the front frame 1301. The cab is mounted on the front frame 1301 through the cab mounting seat 1319. When the steering cylinder 1308 drives the front frame 1301 to turn, it can ensure that the driver's field of vision is always parallel to the direction of travel.
[0043] like Figure 1 , Figure 3 and Figure 4 As shown, in this embodiment, the swing frame 1305 includes a first hinge seat 1307 for connecting the front frame 1301, a swing beam 1310 hinged to the first hinge seat 1307 via a swing pin 1304, and an axle mounting seat 1306 for connecting the front axle 11 disposed on the swing beam 1310; a swing limiting plate 1309 is disposed on the front frame 1301, which abuts against the swing beam 1310 to limit the maximum swing angle β of the swing beam 1310 relative to the front frame 1301; the two swing limiting plates 1309 are respectively disposed on both sides of the swing beam 1310. When the tractor is traveling horizontally, the swing beam 1310 is in a horizontal state; when the tractor enters uneven terrain, the swing beam 1310 can swing left and right in the vertical plane via the swing pin 1304, such as... Figure 5As shown, when the swing beam 1310 swings to the right in the vertical plane until its left side abuts against the left swing limit plate 1309, the swing angle of the front axle 11 driven by the swing beam 1310 is the maximum swing angle β. When the swing beam 1310 swings to the left in the vertical plane until its right side abuts against the right swing limit plate 1309, the swing angle of the front axle 11 driven by the swing beam 1310 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 1301, 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 1305 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 1305 is too small, and the tractor's passability on uneven terrain is poor. Optionally, the maximum swing angle β is 11°.
[0044] In this embodiment, the swing frame 1305 includes a first hinge seat 1307 for connecting the rear frame 1302, a swing beam 1310 hinged to the first hinge seat 1307 via a swing pin 1304, and an axle mounting seat 1306 for connecting the rear axle 8, arranged on the swing beam 1310. A swing limiting plate 1309 is arranged on the rear frame 1302, which abuts against the swing beam 1310 to limit the maximum swing angle β of the swing beam 1310 relative to the rear frame 1302. Two swing limiting plates 1309 are respectively arranged on both sides of the swing beam 1310. When the tractor travels horizontally, the swing beam 1310 is in a horizontal state. When the tractor enters uneven terrain, the swing beam 1310 can swing left and right in the vertical plane via the swing pin 1304. Figure 5 As shown, when the swing beam 1310 swings to the right in the vertical plane until its left side abuts against the left swing limit plate 1309, the swing angle of the rear axle 8 driven by the swing beam 1310 is the maximum swing angle β. When the swing beam 1310 swings to the left in the vertical plane until its right side abuts against the right swing limit plate 1309, the swing angle of the rear axle 8 driven by the swing beam 1310 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 1302, 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 1305 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 1305 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, 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, a bolt 1401, and a nut 1406 adapted to the bolt 1401. The bolt 1401 passes sequentially through the first protective cover 1403, the first damping block 1402, and the second damping block 1404. The second protective cover 1405, the nut 1406 and the bolt 1401 cooperate to clamp the first damping block 1402 and the second damping block 1404 to the front frame 1301, and the power system presses on the first protective cover 1403. 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.
[0046] In this embodiment, the power system includes an engine 1, a gear shifter 2, a first driveshaft 3, and a four-wheel drive transfer case 4. The power output end of the engine 1 is connected to the input end of the gear shifter 2, and the output end of the gear shifter 2 is connected to the input end of the four-wheel drive transfer case 4 via the first driveshaft 3. The four-wheel drive transfer case 4 drives both the front axle 11 and the rear axle 8 simultaneously via a transmission mechanism. The engine 1 and / or the four-wheel drive transfer case 4 are connected to the front frame 1301 via a vibration damping device 14. The first driveshaft 3 is a universal joint. The front frame 1301 is equipped with an engine mounting base 1320 and a four-wheel drive transfer case mounting base 1321. The engine 1 is mounted on the engine mounting base 1320 via the vibration damping device 14, and the four-wheel drive transfer case 4 is mounted on the four-wheel drive transfer case mounting base 1321 via the vibration damping device 14.
[0047] It can reduce load fluctuations between engine 1 and transmission 4, improving shift smoothness; the power system is mounted on the front frame 1301, which can effectively ensure that the tractor's front axle bears no less than 20% of the vehicle's weight even under extreme working conditions, effectively preventing wheelies. Optionally, the gear shifter 2 is a clutch or torque converter, which can be adapted to different shift modes.
[0048] In this embodiment, the transmission mechanism includes a second driveshaft 5, a driveshaft transition seat 6, a third driveshaft 7, and a fourth driveshaft 10. The front output end of the four-wheel drive transfer case 4 is connected to the input end of the front axle 11 through the fourth driveshaft 10. The rear output end of the four-wheel drive transfer case 4 is connected to the input end of the rear axle 8 through the second driveshaft 5, the driveshaft transition seat 6, and the third driveshaft 7. The driveshaft transition seat 6 is mounted on the rear frame 1302. The flange end faces at both ends of the second driveshaft 5 are equidistant from the steering pin shaft 1303. The second driveshaft 5, the third driveshaft 7, and the fourth driveshaft 10 are all universal joints. The distance from the flange end faces at both ends of the second driveshaft 5 to the steering pin shaft 1303 is L. This allows the tractor to transmit power from the power system to the rear axle 8 when it bends over to turn, thereby achieving four-wheel drive. This enables the tractor to adapt to the complex terrain of hilly and mountainous areas and greatly improves the tractor's passability on uneven working surfaces.
[0049] In this embodiment, a first bearing 1316 for connecting the steering pin 1303 is provided on the front frame 1301 and / or the rear frame 1302. The first bearing 1316 can reduce frictional resistance during steering and extend the service life of the frame. Optionally, the first bearing 1316 is a rolling bearing. Rolling bearings have low frictional resistance, which can reduce the frictional resistance of the front frame 1301 relative to the rear frame 1302 during steering. Optionally, the first bearing 1316 is a sliding bearing. Sliding bearings have a large bearing area and are buffered by a lubricating oil film, resulting in stronger impact resistance and suitability for rugged roads in hilly and mountainous areas. Optionally, the first bearing 1316 is a spherical bearing. Spherical bearings allow the steering shaft to have a certain amount of sway space relative to the front frame 1301, allowing the connection between the front frame 1301 and the rear frame 1302 to arch upwards, which can improve the tractor's passability on rugged roads in hilly and mountainous areas.
[0050] In this embodiment, two steering pins 1303 are coaxial and spaced apart. An upper hinge plate 1312 and a lower hinge plate 1313 are mounted on the front frame 1301, and an upper hinge seat 1314 and a lower hinge seat 1315 are mounted on the rear frame 1302. First bearings 1316 are respectively mounted on the upper hinge plate 1312 and the lower hinge plate 1313. One steering pin 1303 is mounted on the upper hinge seat 1314 and connected to the first bearing 1316 on the upper hinge plate 1312. Another steering pin 1303 is mounted on the lower hinge seat 1315 and connected to the first bearing 1316 on the lower hinge plate 1313. Compared with a single long shaft, two short steering pins 1303 reduce weight and provide clearance for the second drive shaft 5, allowing the second drive shaft 5 to transmit power to the rear axle 8 through the gap between the two steering pins 1303, thereby achieving four-wheel drive and improving the tractor's passability on rugged hilly roads. Optionally, such as Figure 6 and Figure 7As shown, the first bearing 1316 is a rolling bearing, which is mounted on the upper hinge plate 1312. The steering pin 1303 at the upper end of the rear frame 1302 is mounted on the upper hinge seat 1314 and hinged to the upper hinge plate 1312 via the rolling bearing. The rolling bearing has low frictional resistance, which can reduce the frictional resistance of the front frame 1301 relative to the rear frame 1302 during steering. Optionally, as... Figure 6 and Figure 8 As shown, the first bearing 1316 is a rolling bearing, which is mounted on the lower hinge plate 1313. The steering pin 1303 at the lower end of the rear frame 1302 is mounted on the lower hinge seat 1315 and hinged to the lower hinge plate 1313 via the rolling bearing. The rolling bearing has low frictional resistance, which can reduce the frictional resistance of the front frame 1301 relative to the rear frame 1302 during steering. Optionally, as... Figure 9 As shown, the first bearing 1316 is a sliding bearing. Two sliding bearings are respectively mounted on the upper hinge seat 1314 and the upper hinge plate 1312. The steering pin 1303 at the upper end of the rear frame 1302 is hinged to the upper hinge seat 1314 and the upper hinge plate 1312 via the sliding bearings. 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 1316 is a sliding bearing. The three sliding bearings are respectively arranged on the lower hinge plate 1313 and the lower hinge seat 1315. The steering pin 1303 at the lower end of the rear frame 1302 is hinged to the lower hinge plate 1313 and the lower hinge seat 1315 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 1316 is a spherical plain bearing. The outer ring of one spherical plain bearing is connected to the upper hinge plate 1312, and the inner ring of the spherical plain bearing is connected to the steering pin 1303 at the upper end of the rear frame 1302. The outer ring of another spherical plain bearing is connected to the lower hinge plate 1313, and the inner ring of the spherical plain bearing is connected to the steering pin 1303 at the lower end of the rear frame 1302. The spherical plain bearing can not only hinge the front frame 1301 and the rear frame 1302, but also allow the steering shaft to have a certain amount of sway space relative to the front frame 1301, so that the connection between the front frame 1301 and the rear frame 1302 can be arched upward, which can improve the tractor's passability on rugged roads in hilly and mountainous areas.
[0051] like Figure 6 , Figure 11 and Figure 13As shown, in this embodiment, a steering limit block 1317 is provided on the rear frame 1302, and a steering limit plate 1318 is provided on the front frame 1301. The steering limit plate 1318 and the steering limit block 1317 cooperate to limit the maximum turning angle α of the front frame 1301 and the rear frame 1302. It can be understood that a steering limit block 1317 can also be provided on the front frame 1301, and a steering limit plate 1318 can be provided on the rear frame 1302, which can also limit the maximum turning angle α of the front frame 1301 and the rear frame 1302, and prevent the tractor from over-steering. Two steering limit blocks 1317 are symmetrically arranged on both sides of the rear frame 1302. When the tractor is traveling horizontally, the two steering limit blocks 1317 are symmetrical about the axis of the steering limit plate 1318. When the tractor turns, the front frame 1301 can swing left and right in the horizontal plane. When the front frame 1301 swings to the left in the horizontal plane, it continues until the left side wall of the steering limit plate 1318 abuts against the left steering limit block 1317. At this time, the swing angle between the front frame 1301 and the rear frame 1302 is the maximum swing angle α. When the front frame 1301 swings to the right in the horizontal plane, it continues until the right side wall of the steering limit plate 1318 abuts against the right steering limit block 1317. At this time, the swing angle between the front frame 1301 and the rear frame 1302 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 1318 is mounted on the lower hinge plate 1313 or the upper hinge plate 1312. The position of the steering limit block 1317 is adjusted accordingly to align with the steering limit plate 1318, which can accommodate different tractor models.
[0052] like Figure 11 and Figure 14As shown, in this embodiment, the folding steering tractor chassis also includes a steering locking rod 1311 for rigidly connecting the front frame 1301 and the rear frame 1302 to restrict the retraction of the steering cylinder 1308. One end of the steering locking rod 1311 is detachably connected to the front frame 1301, and the other end is detachably connected to the rear frame 1302. When turning is required, the steering locking rod 1311 is removed, allowing the steering cylinder 1308 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 1311 to the front frame 1301 and the rear frame 1302 restricts the retraction of the steering cylinder 1308, allowing the tractor to maintain straight-line travel. Optionally, as... Figure 11 As shown, a connecting seat 1324 is provided on the front frame 1301. The connecting seat 1324 is connected to the steering lock rod 1311 by a pin. A second hinge seat 1325 is provided on the rear frame 1302. The steering lock rod 1311 is hinged to the second hinge seat 1325 by bolts. In use, the rigid connection between the front frame 1301 and the rear frame 1302 can be achieved by inserting and removing the pin. The structure is simple, the operation is convenient, and there is no need to store the steering lock rod 1311 separately.
[0053] 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 chassis, characterized in that, The vehicle includes a slack-beam steering frame (13), on which a power system, a front axle (11), and a rear axle (8) are mounted. The power system drives the front axle (11) and the rear axle (8) simultaneously through a transmission mechanism. The slack-beam steering frame (13) includes a front frame (1301), a rear frame (1302), a steering pin (1303) for hinged between the front frame (1301) and the rear frame (1302), a swing arm (1305), a swing pin (1304), and a steering cylinder (1308) for adjusting the angle between the front frame (1301) and the rear frame (1302). The swing pin (1304) is arranged perpendicular to the steering pin (1303). The power system is connected to the slack-beam steering frame (13) through a vibration damping device (14). The front axle (11) is mounted on the swing frame (1305), and the front frame (1301) is hinged to the swing frame (1305) via the swing pin (1304), or the rear axle (8) is mounted on the swing frame (1305), and the rear frame (1302) is hinged to the swing frame (1305) via the swing pin (1304).
2. The hinged steering tractor chassis according to claim 1, characterized in that, The swing frame (1305) includes a first hinge seat (1307) for connecting the front frame (1301), a swing beam (1310) hinged to the first hinge seat (1307) via the swing pin (1304), and an axle mounting seat (1306) for connecting the front axle (11) arranged on the swing beam (1310); a swing limiting plate (1309) is arranged on the front frame (1301), and the swing limiting plate (1309) is used to abut against the swing beam (1310) to limit the maximum swing angle of the swing beam (1310) relative to the front frame (1301).
3. The hinged steering tractor chassis according to claim 1, characterized in that, The swing frame (1305) includes a first hinge seat (1307) for connecting the rear frame (1302), a swing beam (1310) hinged to the first hinge seat (1307) via the swing pin (1304), and an axle mounting seat (1306) for connecting the rear axle (8) arranged on the swing beam (1310). A swing limiting plate (1309) is arranged on the rear frame (1302), and the swing limiting plate (1309) is used to abut against the swing beam (1310) to limit the maximum swing angle of the swing beam (1310) relative to the rear frame (1302).
4. The folding steering tractor chassis according to any one of claims 1 to 3, characterized in that, 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 through the first protective cover (1403), the first damping block (1402), the second damping block (1404), and the second protective cover (1405) in sequence. The nut (1406) cooperates with the bolt (1401) to clamp the front frame (1301) between the first damping block (1402) and the second damping block (1404). The power system presses on the first protective cover (1403).
5. The hinged steering tractor chassis according to claim 4, characterized in that, The power system includes an engine (1), a gear shifter (2), a first drive shaft (3), and a four-wheel drive transfer case (4). The power output end of the engine (1) is connected to the input end of the gear shifter (2). The output end of the gear shifter (2) is connected to the input end of the four-wheel drive transfer case (4) through the first drive shaft (3). The four-wheel drive transfer case (4) drives the front axle (11) and the rear axle (8) simultaneously through the transmission mechanism. The engine (1) and / or the four-wheel drive transfer case (4) are connected to the front frame (1301) through the shock absorption device (14).
6. The hinged steering tractor chassis according to claim 5, characterized in that, The transmission mechanism includes a second drive shaft (5), a drive shaft transition seat (6), a third drive shaft (7), and a fourth drive shaft (10). The front output end of the four-wheel drive transfer case (4) is connected to the input end of the front axle (11) through the fourth drive shaft (10). The rear output end of the four-wheel drive transfer case (4) is connected to the input end of the rear axle (8) through the second drive shaft (5), the drive shaft transition seat (6), and the third drive shaft (7). The drive shaft transition seat (6) is mounted on the rear frame (1302). The flange end faces at both ends of the second drive shaft (5) are equidistant from the steering pin shaft (1303).
7. The hinged steering tractor chassis according to claim 1, characterized in that, The front frame (1301) and / or the rear frame (1302) are provided with a first bearing (1316) for connecting the steering pin (1303).
8. The folding steering tractor chassis according to claim 7, characterized in that, The two steering pins (1303) are coaxial and spaced apart. The front frame (1301) is provided with an upper hinge plate (1312) and a lower hinge plate (1313). The rear frame (1302) is provided with an upper hinge seat (1314) and a lower hinge seat (1315). The upper hinge plate (1312) and the lower hinge plate (1313) are respectively provided with a first bearing (1316). One steering pin (1303) is provided on the upper hinge seat (1314) and connected to the first bearing (1316) on the upper hinge plate (1312). The other steering pin (1303) is provided on the lower hinge seat (1315) and connected to the first bearing (1316) on the lower hinge plate (1313).
9. The hinged steering tractor chassis according to claim 8, characterized in that, The rear frame (1302) is provided with a steering limit block (1317), and the front frame (1301) is provided with a steering limit plate (1318). The steering limit plate (1318) and the steering limit block (1317) cooperate to limit the maximum turning angle of the front frame (1301) and the rear frame (1302).
10. The hinged steering tractor chassis according to claim 1, characterized in that, It also includes a steering locking rod (1311) for rigidly connecting the front frame (1301) and the rear frame (1302) to limit the retraction of the steering cylinder (1308), one end of the steering locking rod (1311) being detachably connected to the front frame (1301) and the other end of the steering locking rod (1311) being detachably connected to the rear frame (1302).