A tractor wheel-track interchangeable power chassis

Abstract

This invention relates to a tractor wheel-track interchangeable power chassis, belonging to the field of agricultural machinery technology. The power chassis has a front-mounted power system and adopts a wheel-track folding steering transmission system with a small steering circle and flexible steering. It is equipped with an externally meshing end assembly arranged with a vertical height difference, resulting in high ground clearance to meet the conditions for wheel-track interchangeable installation. The track walking mechanism is a unidirectional tensioned triangular track assembly. The drive wheel uses a gear with a large pitch circle diameter to match the vehicle speed and is designed with a swing structure to adapt to complex terrain. The power chassis can realize the interchangeability of wheel-type walking mechanism and track-type walking mechanism, adapting to the complex operating conditions of hilly and mountainous areas, and is conducive to promoting the development of agricultural planting and harvesting mechanization.

Description

Technical Field

[0001] This invention relates to the field of agricultural machinery technology, specifically to a tractor wheel-track interchangeable power chassis. Background Technology

[0002] Domestic tobacco cultivation is mostly concentrated in hilly and mountainous areas. However, hilly and mountainous areas have high mountains and steep slopes, and arable land is scattered. Tobacco cultivation involves many links such as plowing, rotary tillage, embankment, pond digging, fertilization, mulching, transplanting, watering, plant protection, mulching removal, pole lifting, and transportation. The working conditions are complex and a wide variety of machinery is required.

[0003] Currently, the running gear of ordinary tractors on the market is either wheeled or tracked. Wheeled tractors have a fast operating speed and are suitable for flat terrain, but they are prone to slipping and have poor stability when operating in hilly and mountainous areas. Tracked tractors have high driving force and low ground pressure, which makes them highly passable, but they lack steering flexibility. The chassis of ordinary tractors with a single running gear cannot meet the needs of anti-slip operation on slopes and efficient operation on flat terrain, making it difficult to apply to different operating scenarios in tobacco planting. It cannot meet the needs of full mechanization of tobacco planting in hilly areas, resulting in "no machines available" and "no good machines available".

[0004] To address the challenges of achieving full mechanization in tobacco production in hilly and mountainous areas, where there is a lack of suitable and high-quality power chassis, creating a power chassis adapted to the complex conditions of hilly and mountainous terrain is an inevitable choice to accelerate the mechanization of tobacco transplanting and harvesting in these areas. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a tractor wheel-track interchangeable power chassis, enabling the interchangeability of the tractor's tracked walking mechanism and wheeled walking mechanism. This chassis can be applied to different operating scenarios in tobacco planting, meeting the needs of full-process mechanization in tobacco planting in hilly areas.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A tractor wheel-track interchangeable power chassis includes a power system, a transmission system, and a running gear. The transmission system is a wheel-track articulated steering transmission system. The power system is installed at the front of the wheel-track articulated steering transmission system. The running gear is installed on the end assemblies on the front and rear sides of the wheel-track articulated steering transmission system. The running gear is a tracked running gear or a wheeled running gear. The wheel-track interchangeability is achieved by configuring a wheeled running gear or a tracked running gear on the power chassis shown.

[0008] Furthermore, the wheel-track slalom steering transmission system includes a clutch assembly, a front box, a slalom steering assembly, a gearbox, a brake assembly, and an end assembly. The front box and the gearbox are connected by a pin hinge. An upper universal joint and a lower universal joint are respectively fitted on the upper and lower axle heads between the front box and the gearbox. The slalom steering assembly is connected between the front box and the gearbox. The brake assembly is installed between the gearbox and the left rear end assembly. The clutch assembly is connected between the power system and the front box. The end assembly is installed on the left and right sides of the front box and the gearbox and is connected to the drive shaft.

[0009] Furthermore, the end assembly is an externally engaged structure with a vertical height difference, including a left rear end assembly, a left front end assembly, a right front end assembly, and a right rear end assembly; the right front end assembly and the left rear end assembly have the same structure, and the left front end assembly and the right rear end assembly have the same structure; the left front end assembly and the right front end assembly are respectively installed on the left and right sides of the front box and their structures are symmetrical, and the left rear end assembly and the right rear end assembly are respectively installed on the left and right sides of the gearbox.

[0010] The left rear end assembly includes an end housing, an end front gear, an end rear gear, an end output shaft, and an end cover. The end housing is mounted on the outside of the brake assembly. The end front gear is mounted on the end housing and connected to the drive shaft. The end rear gear meshes with the end front gear and is located to the side and below the end front gear, with a height difference H between them. The end output shaft is fixed on the end rear gear and is used to mount and drive the walking mechanism. The end cover is mounted on the end housing to protect the internal components. A suspension mounting interface is provided below the end housing.

[0011] Furthermore, the tracked walking mechanism is a triangular track assembly, which includes a rubber track, a drive wheel, a fixed tension wheel, a telescopic tension wheel, a track frame, an anti-slip bar, and a support roller. The drive wheel is mounted on the end assembly of the wheel-track folding steering transmission system. The track frame is located below the drive wheel and is connected to the end assembly below via a swing structure. The fixed tension wheel and the telescopic tension wheel are mounted at the front and rear ends of the track frame, and the support roller and the anti-slip bar are mounted below the track frame. The drive wheel, the fixed tension wheel, and the telescopic tension wheel are arranged in a triangle, and the rubber track is located around the drive wheel, the telescopic tension wheel, the support roller, and the fixed tension wheel.

[0012] Furthermore, the swing structure includes an end connection support, a frame connection support, and a pin welded joint. The frame connection support is connected above the track frame, and the end connection support is connected below the end assembly of the wheel-track folding steering transmission system. The end connection support and the frame connection support are connected by a pin welded joint. The end connection support is provided with a mating boss A and a boss B on the bottom and top of the frame connection support, respectively, to limit the swing angle of the frame connection support around the end connection support through the pin welded joint.

[0013] Furthermore, the rubber track is a toothed track, and the drive wheel is a gear with a large pitch circle diameter.

[0014] Furthermore, the track frame is mainly welded from rectangular tube one, rectangular tube two, round tube and multiple steel plates. Rectangular tube three is welded to the support of the telescopic tension wheel and is fitted into the rectangular tube one of the track frame to achieve forward and backward movement. The telescopic tension wheel is tensioned in one direction by track tensioning bolts installed on the track frame.

[0015] Furthermore, a scraper is installed on the support of the telescopic tension wheel, and the mounting hole on the scraper is an oblong hole, which can adjust the installation position.

[0016] Furthermore, the front and rear output speeds of the wheel-track folding steering transmission system are the same, and the wheel-type walking mechanism consists of four identical wheel assemblies.

[0017] Beneficial effects

[0018] The tractor wheel-track interchangeable power chassis of the present invention can realize the interchangeability of the tractor track walking mechanism and the wheel walking mechanism. The power system is located at the front, and the power chassis adopts a hinged steering transmission system with a small steering circle. It is designed with a high ground clearance end assembly, which has a high ground clearance to meet the installation conditions of wheel-track interchange and adapt to complex terrain. It adopts a wide track structure with low ground pressure, which can adapt to complex terrain and agronomic requirements and meet the operation needs of tobacco planting in hilly and mountainous areas.

[0019] This invention designs a matching triangular track assembly for a tractor wheel-track interchangeable power chassis, which has high passability, speed matching, and high maneuverability. It uses gears with a large pitch circle diameter to match the vehicle speed and meet the speed requirements for wheel-track interchange. The design of the swing structure improves the passability of the entire triangular track assembly and can adapt to complex terrain. The tension wheel is tensioned in one direction forward or backward to meet the steering conditions for bending steering.

[0020] The tractor wheel-track interchangeable power chassis of this invention has made breakthroughs in key technologies such as high-gradient and high-passability walking mechanism technology, universal wheel-track and speed matching technology for hilly and mountainous power chassis, high-flexibility steering technology, and integrated creation of special power chassis for hilly and mountainous areas. It has solved the problem of rapid wheel-track interchange and power system compatibility, improved the adaptability of agricultural power equipment in hilly and mountainous areas, and is conducive to accelerating the mechanization of tobacco production, transplanting, and harvesting in hilly and mountainous areas. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the tracked walking mechanism configured on the tractor wheel-track interchangeable power chassis of the present invention.

[0022] Figure 2This is a schematic diagram of the wheeled walking mechanism configured on the tractor wheel-track interchangeable power chassis of the present invention.

[0023] Figure 3 This is a schematic diagram of the wheel-track folding steering transmission system of the tractor wheel-track interchangeable power chassis of the present invention.

[0024] Figure 4 This is a schematic diagram of the high ground clearance end assembly of the tractor wheel-track interchangeable power chassis of the present invention.

[0025] Figure 5 This is a schematic diagram of the tracked walking mechanism of the tractor wheel-track interchangeable power chassis of the present invention.

[0026] Figure 6 This is a schematic diagram of the track walking mechanism assembled in the high ground clearance end assembly of the tractor wheel-track interchangeable power chassis of the present invention.

[0027] Figure 7 This is a schematic diagram of the swing structure of the triangular track assembly of the present invention.

[0028] Figure 8 This is a schematic diagram of the track frame structure of the triangular track assembly of the present invention.

[0029] Reference numerals: 1 Power system; 2 Wheel assembly; 3 Tracked articulated steering transmission system; 4 Triangular track assembly; 3.1 Left rear end assembly; 3.2 Brake assembly; 3.3 Gearbox; 3.4 Articulated steering assembly; 3.5 Front box; 3.6 Clutch assembly; 3.7 Left front end assembly; 3.8 Lower universal joint; 3.9 Upper universal joint; 3.1.1 End cap; 3.1.2 End front gear; 3.1.3 End housing; 3.1.4 End rear gear; 3.1.5 End output shaft; 3.1.6 Suspension mounting interface; 4.1 Rubber track; 4.2 Drive wheel. 4.3 End connecting support, 4.4 Pin shaft welded assembly, 4.5 Frame connecting support, 4.6 Fixed tension wheel, 4.7 Track frame, 4.8 Anti-slip bar, 4.9 Track roller, 4.3.1 Boss A, 4.5.1 Boss B, 4.10 Telescopic tension wheel, 4.11 Scraper blade, 4.12 Track tension bolt; 4.7.1 Steel plate one, 4.7.2 Perforated steel plate two, 4.7.3 Rectangular tube one, 4.7.4 Perforated steel plate three, 4.7.5 Round tube, 4.7.6 Rectangular tube two, 4.7.7 Steel plate four, 4.10.1 Rectangular steel tube three, 4.10.2 Top plate. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0031] The present invention provides a tractor wheel-track interchangeable power chassis, comprising a power system 1, a wheel-track articulated steering transmission system 3, and a traveling mechanism; the power system 1 is bolted to the front of the wheel-track articulated steering transmission system 3, and the traveling mechanism is mounted on the front and rear sides of the wheel-track articulated steering transmission system 3. The traveling mechanism is a tracked traveling mechanism or a wheeled traveling mechanism. The wheel-track interchangeability is achieved by configuring different traveling mechanisms on the power chassis shown.

[0032] like Figure 1 As shown, when a tractor with an interchangeable wheel-track power chassis is configured with a tracked walking mechanism, it includes a power system 1, triangular track assemblies 4, and a wheel-track folding steering transmission system 3; the power system 1 is bolted to the front of the wheel-track folding steering transmission system 3, and the four triangular track assemblies 4 are bolted to the front and rear sides of the wheel-track folding steering transmission system 3; as shown... Figure 2 As shown, when the tractor wheel-track interchangeable power chassis is equipped with a wheeled running mechanism, it includes a power system 1, a wheel-track slack steering transmission system 3, and a wheel assembly 2. The wheel assembly 2 is installed in the same position as the triangular track assembly 4, both of which are bolted to the front and rear sides of the wheel-track slack steering transmission system 3. The difference between the wheeled power chassis and the tracked power chassis is that wheel-track interchangeability is achieved by configuring different running mechanisms.

[0033] like Figure 3 As shown, the wheel-track slalom steering transmission system 3 includes: a brake assembly 3.2, a gearbox 3.3, a slalom steering assembly 3.4, a front housing 3.5, a clutch assembly 3.6, an upper universal joint 3.9, a lower universal joint 3.8, and an end assembly; wherein, the front housing 3.5 and the gearbox 3.3 are connected by a pin hinge, the upper universal joint 3.7 and the lower universal joint 3.8 are fitted onto the upper and lower axle heads between the front housing 3.5 and the gearbox 3.3, the slalom steering assembly 3.4 connects the front housing 3.5 and the gearbox 3.3, and the clutch assembly 3.6 connects to the power unit. Between System 1 and the front box 3.5, there are four end assemblies: the right front end assembly (not marked in the figure), the left rear end assembly 3.1, the left front end assembly 3.7, and the right rear end assembly (not marked in the figure). The left front end assembly 3.7 is bolted to the left front of the front box 3.5, the right front end assembly is bolted to the right front of the front box 3.5, the right rear end assembly is bolted to the right rear of the transmission 3.3, the left rear end assembly 3.1 is bolted to the left rear of the transmission 3.3, and the brake assembly 3.2 is installed between the transmission 3.3 and the left rear end assembly 3.1.

[0034] The power system 1 of this invention is installed at the front end of the wheel-track folding steering transmission system 3. The hinge point of the folding steering is located before the gearbox 3.3. Power is transmitted to the gearbox 3.3 through the upper universal joint 3.9. After gear shifting, it is transmitted back to the front box 3.5 through the lower universal joint 3.8 to supply forward driving force. The power is then output to the running gear through the end assembly outside the front box 3.5 and the gearbox 3.3, realizing the power output of the entire chassis. The power chassis outputs the same speed at the front and rear, which can match four identical wheeled running gears or tracked running gears, ensuring interchangeability.

[0035] The end assembly of the present invention is designed as an externally engaged form with a height difference between the upper and lower parts. The right front end assembly and the left rear end assembly 3.1 have the same structure, the right rear end assembly and the left front end assembly 3.7 have the same structure, and the corresponding structures of the left front end assembly 3.7 and the left rear end assembly 3.1 are reversed in front and back positions, and the rest are the same.

[0036] like Figure 4 As shown, taking the left rear end assembly 3.1 as an example (the end cover 3.1.1 is partially sectioned in the figure to clearly show its internal structure), it includes: end housing 3.1.3, end front gear 3.1.2, end rear gear 3.1.4, end output shaft 3.1.5, and end cover 3.1.1. Since the brake assembly 3.2 is located at the left rear of the folding steering transmission system 3, the end housing 3.1.3 of the left rear end assembly 3.1 is bolted to the outside of the brake assembly 3.2 (for end assemblies in other locations, the end housing 3.1.3 is directly mounted to the outside of the front box 3.5 or the gearbox 3.3). The end front gear 3.1.2, end rear gear 3.1.4, end output shaft 3.1.5, and end cover 3.1.1 are sequentially mounted on the end housing 3.1. 3.1.2 is mounted on the end housing 3.1.3 and connected to the drive shaft (the end assembly located on the rear side, the end front gear 3.1.2 is connected to the drive shaft of the gearbox 3.3, the end assembly located on the front side, the end front gear 3.1.2 is connected to the drive shaft of the front box 3.5), the end rear gear 3.1.4 meshes with the end front gear 3.1.2 and is located below the end front gear 3.1.2, with a height difference H between them, the end output shaft 3.1.5 is fixed on the end rear gear 3.1.4, used to install and drive the corresponding walking mechanism, the end cover 3.1.1 is mounted on the end housing 3.1.3 to protect the internal components, and the end housing 3.1.3 is also provided with a suspension mounting interface 3.1.6 for connecting the track walking mechanism.

[0037] Because there is a height difference H between the front end gear 3.1.2 and the rear end gear 3.1.4, the ground clearance of the whole machine can be increased by H, thereby increasing the passability of the whole machine. The high ground clearance of the end assembly enables the power chassis to meet the requirements of wheel and track interchange.

[0038] like Figure 5-6 As shown, the triangular track assembly 4 includes: a rubber track 4.1, a drive wheel 4.2, an end connecting support 4.3, a pin welded assembly 4.4, a frame connecting support 4.5, a fixed tensioning wheel 4.6, a track frame 4.7, an anti-slip bar 4.8, a track roller 4.9, a telescopic tensioning wheel 4.10, a scraper 4.11, and a track tensioning bolt 4.12.

[0039] The drive wheels 4.2 are bolted to the front and rear sides of the wheel-track flex steering transmission system 3 and connected to the end output shaft 3.1.5 of the end assembly to achieve power output. The end connection support 4.3 is bolted to the lower part of the front and rear end assemblies of the wheel-track flex steering transmission system 3 and connected to the suspension mounting interface 3.1.6 at the lower part of the end housing 3.1.3. The end connection support 4.3 is connected to the frame connection support 4.5 by a pin-welded assembly 4.4. The frame connection support 4.5 is bolted to the track frame 4.7. The tension wheel 4.6, anti-slip bar 4.8, and support roller 4.9 are bolted to the frame 4. On the track frame 4.7, the telescopic tension wheel 4.10 can move back and forth on the track frame 4.7, and the front and rear distance can be adjusted by adjusting the track tension bolt 4.12. The fixed tension wheel 4.6 and the telescopic tension wheel 4.10 are respectively installed at the front and rear ends of the track frame 4.7. The anti-slip bar 4.8 and the support roller 4.9 are installed below the track frame 4.7. The anti-slip bar 4.8 is located between the two cores of the rubber track 4.1 to achieve the anti-slip effect. The drive wheel 4.2, the fixed tension wheel 4.6, and the telescopic tension wheel 4.10 are arranged in a triangle. The rubber track 4.1 is installed on the outer perimeter. The scraper 4.11 is fixed to the support of the telescopic tension wheel 4.10 by bolts.

[0040] like Figure 7 As shown, the end connecting support 4.3 and the frame connecting support 4.5 are connected by a pin welded joint 4.4, forming the swing structure of the triangular track assembly 4. The lower surface of the end connecting support 4.3 has two bosses A4.3.1 front and back, and the upper surface of the frame connecting support 4.5 has two bosses B4.5.1 front and back. Bosses A4.3.1 and B4.5.1 serve as limiters to restrict the swing amplitude of the triangular track assembly 4. In this embodiment, the frame connecting support 4.5 drives the track frame 4.7 and the components installed on it to rotate ±8° around the end connecting support 4.3 through the pin welded joint 4.4, thereby achieving the passability of the entire triangular track assembly 4.

[0041] The triangular track assembly 4 of the present invention has the following features and functions: the rubber track 4.1 adopts a toothed rubber track, the drive wheel 4.2 is a cast gear with a large pitch circle diameter. During installation, the drive wheel 4.2 is connected to the end output shaft 3.1.5 by bolts. The large diameter drive wheel 4.2 ensures that the linear speed of the track will not decrease too much, meeting the speed requirements for track interchange. The use of a wide track can reduce the ground pressure. The upper part of the end connecting support 4.3 is connected to the suspension mounting interface 3.1.6 below the end housing 3.1.3 by bolts.

[0042] When the tracked walking mechanism is installed on the powered chassis, the four triangular track assemblies 4 are respectively installed on the front and rear sides of the wheel-track folding steering transmission system 3, as follows: Figure 1 As shown, the triangular track assemblies 4 installed on the front and rear sides have the same overall structure, except that the track frame 4.7 is adjusted to reverse its front and rear positions. This ensures that the telescopic tension wheel 4.10 of the triangular track assembly 4 installed on the front side of the power chassis is located in front of the track frame 4.7, and the telescopic tension wheel 4.10 of the triangular track assembly 4 installed on the rear side of the power chassis is located behind the track frame 4.7.

[0043] The track frame 4.7 is mainly welded from rectangular tubes, round tubes, and steel plates; taking the triangular track assembly 4 installed at the front right or rear left of the frame as an example, the specific structure of the track frame 4.7 is as follows: Figure 5 and 8As shown, the main body of the track frame 4.7 consists of two rectangular tubes arranged side by side: 4.7.3 (rectangular tube 1) and 4.7.6 (rectangular tube 2). Two round tubes 4.7.5 and a steel plate 4.7.1 are welded laterally between the two rectangular tubes. The steel plate 4.7.1 is welded to one end of both rectangular tubes 4.7.3 and 4.7.6, and has screw holes for installing track adjusting bolts 4.12. A perforated steel plate is welded to the bottom of rectangular tube 4.7.3. 4.7.2, the other end of rectangular tube 4.7.3 is welded with a perforated steel plate 4.7.4. The rectangular tubes 4.7.3 and 4.7.6 of the left front / right rear track frame 4.7 are reversed in front and back positions, but the rest of the structure is the same; the fixed tension wheel 4.6 is bolted to the perforated steel plate 4.7.4, and the anti-detachment rod 4.8 and the two support rollers 4.9 are bolted to the perforated steel plate 4.7.2. The anti-detachment rod 4.8 is located at... The rubber track 4.1 has a two-core anti-slip effect between its cores; a rectangular steel tube 4.10.1 is welded to the support of the telescopic tensioning wheel 4.10. The rectangular steel tube 4.10.1 is assembled inside the rectangular tube 4.7.3, allowing it to extend and retract horizontally. A top plate 4.10.2 is welded to the rectangular steel tube 4.10.1. Track tensioning bolts 4.12 are installed in the screw holes on the steel plate 4.7.1, and are tightened by the track tensioning bolts 4.12. The top plate 4.10.2 limits the telescopic tensioning wheel 4.10 to achieve the tensioning function. The scraper 4.11 is installed on the rectangular steel pipe 4.10.1. The mounting hole of the scraper 4.11 is an oblong hole, allowing for adjustment of its installation position. A support roller scraper (not shown in the figure) is installed on the perforated steel plate 4.7.2, providing a certain scraping effect on the support roller. Steel plates 4.7.7 are welded to the two rectangular tubes of the track frame 4.7. Figure 4 , 7 As shown in Figure 8, the steel plate 4.7.7 welded to the frame 4.7 is connected by bolts. The lower part of the end connection support 4.3 is connected to the frame connection support 4.5 by a pin-welded assembly 4.4. The end connection support 4.3 is installed on the suspension mounting interface 3.1.6 below the end assembly by bolts, realizing the connection between the track frame 4.7 and the end assembly. At the same time, the track swing function is realized through the pin connection and the limiting boss.

[0044] The present invention relates to a tractor wheel-track interchangeable power chassis, wherein the power system 1 is front-mounted, the steering method is zigzag steering, the transmission system end is externally engaged, and the ground clearance is high. The end housing 3.1.3 has an end output shaft 3.1.5 and a suspension mounting interface 3.1.6 for mounting the triangular track assembly 4 or the wheel assembly 2. This chassis can realize the interchangeability of wheels and tracks, solving the problem of no good chassis in tobacco planting areas in the south. When tobacco operations are carried out in paddy fields, where high driving force and low ground pressure are required, tracks can be selected for operation. When operating in dry fields, wheels can be selected for operation, improving work efficiency. It has the advantages of wide ground clearance adaptability, high ground clearance, and good passability, and can adapt to complex terrain and agronomic requirements, meeting the operational needs of tobacco planting in hilly and mountainous areas.

[0045] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A tractor wheel-track interchangeable power chassis, comprising a power system (1), a transmission system, and a walking mechanism, characterized in that, The transmission system is a wheel-track slalom steering transmission system (3). The power system (1) is installed at the front of the wheel-track slalom steering transmission system (3). The running mechanism is installed on the end assemblies on the front and rear sides of the wheel-track slalom steering transmission system (3). The running mechanism is a tracked running mechanism or a wheeled running mechanism. The wheel and track can be interchanged by configuring a wheeled running mechanism or a tracked running mechanism on the power chassis. The wheel-track slalom steering transmission system (3) includes a clutch assembly (3.6), a front box (3.5), a slalom steering assembly (3.4), a gearbox (3.3), a brake assembly (3.2), and an end assembly. The front box (3.5) and the gearbox (3.3) are connected by a pin hinge. Upper universal joint (3.9) and lower universal joint (3.8) are respectively fitted on the upper and lower axle heads between the front box (3.5) and the gearbox (3.3). The folding steering assembly (3.4) is connected between the front box (3.5) and the gearbox (3.3). The brake assembly (3.2) is installed between the gearbox (3.3) and the left rear end assembly (3.1). The clutch assembly (3.6) is connected between the power system (1) and the front box (3.5). Power is transmitted to the gearbox (3.3) through the upper universal joint (3.9), and after gear shifting, it is transmitted back to the front box (3.5) through the lower universal joint (3.8) to supply front driving force. The power then passes through the front box (3.5) again. The power output from the end assembly outside the gearbox (3.3) to the walking mechanism is realized, thus realizing the power output of the entire chassis. The end assembly is an external meshing structure with a vertical height difference, including the left rear end assembly (3.1), the left front end assembly (3.7), the right front end assembly, and the right rear end assembly. The end assemblies are respectively installed on the left and right sides of the front box (3.5) and the gearbox (3.3) and connected to the drive shaft. The left rear end assembly (3.1) includes an end housing (3.1.3), an end front gear (3.1.2), an end rear gear (3.1.4), an end output shaft (3.1.5), and an end cover (3.1.1). The end housing (3.1.3) The end front gear (3.1.2) is installed on the outside of the brake assembly (3.2). The end front gear (3.1.2) is installed on the end housing (3.1.3) and connected to the drive shaft. The end rear gear (3.1.4) meshes with the end front gear (3.1.2) and is located below the end front gear (3.1.2). There is a height difference H between the two. The end output shaft (3.1.5) is fixed on the end rear gear (3.1.4) and is used to install and drive the walking mechanism. The end cover (3.1.1) is installed on the end housing (3.1.3) to protect the internal components. The end housing (3.1.3) has a suspension mounting interface (3.1.6) below it for connecting the track walking mechanism.

2. The tractor wheel-track interchangeable power chassis according to claim 1, characterized in that, The right front end assembly and the left rear end assembly (3.1) have the same structure, and the left front end assembly (3.7) and the right rear end assembly have the same structure. The left front end assembly and the right front end assembly are respectively installed on the left and right sides of the front box (3.5) and their structures are symmetrical. The left rear end assembly and the right rear end assembly are respectively installed on the left and right sides of the gearbox (3.3).

3. The tractor wheel-track interchangeable power chassis according to claim 1, characterized in that, The tracked walking mechanism is a triangular track assembly (4), which includes a rubber track (4.1), a drive wheel (4.2), a fixed tension wheel (4.6), a telescopic tension wheel (4.10), a track frame (4.7), an anti-slip bar (4.8), and a track roller (4.9). The drive wheel (4.2) is mounted on the end assembly of the wheel-track folding steering transmission system (3). The track frame (4.7) is located below the drive wheel (4.2) and is connected to the end assembly via a swing structure. Below the end assembly, the fixed tension wheel (4.6) and the telescopic tension wheel (4.10) are installed at the front and rear ends of the track frame (4.7), the support roller (4.9) and the anti-slip bar (4.8) are installed below the track frame (4.7), the drive wheel (4.2), the fixed tension wheel (4.6) and the telescopic tension wheel (4.10) are arranged in a triangle, and the rubber track (4.1) is set on the periphery of the drive wheel (4.2), the telescopic tension wheel (4.10), the support roller (4.9) and the fixed tension wheel (4.6).

4. The tractor wheel-track interchangeable power chassis according to claim 3, characterized in that, The swing structure includes an end connecting support (4.3), a frame connecting support (4.5), and a pin welded joint (4.4). The frame connecting support (4.5) is connected above the track frame (4.7), and the end connecting support (4.3) is connected below the end assembly of the wheel-track folding steering transmission system (3). The end connecting support (4.3) and the frame connecting support (4.5) are connected by the pin welded joint (4.4). The end connecting support (4.3) is provided with a boss A (4.3.1) and a boss B (4.5.1) that cooperate with each other below the end connecting support (4.3) and above the frame connecting support (4.5) to limit the swing angle of the frame connecting support (4.5) around the end connecting support (4.3) through the pin welded joint (4.4).

5. A tractor wheel-track interchangeable power chassis according to claim 3, characterized in that, The rubber track (4.1) is a toothed track, and the drive wheel (4.2) is a gear with a large pitch circle diameter.

6. A tractor wheel-track interchangeable power chassis according to claim 3, characterized in that, The track frame (4.7) is mainly composed of rectangular tube 1 (4.7.3), rectangular tube 2 (4.7.6), round tube (4.7.5) and multiple steel plates welded together. Rectangular tube 3 (4.10.1) is welded to the support of the telescopic tension wheel (4.10) and fitted into the rectangular tube 1 (4.7.3) of the track frame (4.7) to achieve forward and backward movement. The telescopic tension wheel (4.10) is tensioned in one direction by the track tension bolt (4.12) installed on the track frame (4.7).

7. A tractor wheel-track interchangeable power chassis according to claim 6, characterized in that, A scraper (4.11) is installed on the support of the telescopic tensioning wheel (4.10). The mounting hole on the scraper (4.11) is an oblong hole, which can adjust the installation position.

8. A tractor wheel-track interchangeable power chassis according to claim 1, characterized in that, The front and rear output speeds of the wheel-track folding steering transmission system (3) are the same, and the wheel-type walking mechanism is a wheel assembly (2) of four identical sizes.

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