Front axle assembly of tractor

Abstract

The utility model discloses a tractor front axle assembly which comprises a main reduction gearbox body, a left wheel hub fixing seat and a right wheel hub fixing seat, the left wheel hub fixing seat and the right wheel hub fixing seat are arranged at the two ends of the main reduction gearbox body, and driving cavities are formed in the left wheel hub fixing seat and the right wheel hub fixing seat. A main shaft seat is assembled at the front end of the main reduction gearbox body, a bearing seat is assembled in the main shaft seat, and the bearing seat comprises a shaft barrel a and a shaft barrel b which are oppositely arranged; rotating cavities are evenly formed in the inner walls of the shaft barrel a and the shaft barrel b at equal intervals along the axes of the shaft barrel a and the shaft barrel b, and balls are installed in the rotating cavities. According to the front axle assembly of the tractor, driving cavities are formed in a left hub fixing base and a right hub fixing base, meanwhile, tail end large gears are installed at the ends of a left half shaft sleeve and a right half shaft sleeve which are connected to the two sides of a main reduction gearbox body, and the tail end large gears are assembled in the driving cavities.

Description

Technical Field

[0001] This utility model relates to the field of front axle assembly technology, specifically a tractor front axle assembly. Background Technology

[0002] As a key piece of equipment in agricultural production, the performance of the tractor's front axle assembly directly affects the machine's overall efficiency, reliability, and service life. Traditional tractor front axle designs have several problems that urgently need to be addressed. For example, some front axle hub mounting structures are not designed reasonably, and the layout of the internal drive chamber does not fully consider the efficiency and stability of power transmission. This leads to power transmission interruptions or jamming in complex farmland operating environments, affecting the tractor's normal driving and operation.

[0003] Meanwhile, some existing designs have defects in assembly processes and structural strength for key components in the front axle responsible for connection and support, such as the main shaft housing and bearing housing. The assembly process is cumbersome, and the overall stability after assembly is poor. Under long-term exposure to complex and variable loads, problems such as loosening and accelerated wear are prone to occur, which not only increases maintenance costs but also reduces the efficiency of tractor use. In addition, inadequate rust prevention treatment of the axle sleeves makes them highly susceptible to corrosion in humid and dusty agricultural operating environments, shortening the overall service life of the front axle.

[0004] From an industry development perspective, with the acceleration of agricultural modernization, the performance requirements for tractors are increasing, and the market size for high-horsepower tractors is constantly expanding. Against this backdrop, the development of a tractor front axle assembly with optimized structure, reliable performance, and good adaptability and durability is urgently needed. Utility Model Content

[0005] The purpose of this invention is to provide a tractor front axle assembly to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A tractor front axle assembly includes a main reduction gearbox and a left wheel hub mounting seat and a right wheel hub mounting seat disposed at both ends of the main reduction gearbox. The left wheel hub mounting seat and the right wheel hub mounting seat each have a drive chamber inside. A main shaft seat is mounted at the front end of the main reduction gearbox, and a bearing seat is mounted inside the main shaft seat. The bearing seat includes a shaft sleeve a and a shaft sleeve b disposed opposite to each other. Rotary cavities are evenly spaced along the axis of the inner walls of shaft sleeve a and shaft sleeve b, and ball bearings are installed inside the rotary cavities. A left half-shaft sleeve is disposed on one side of the main reduction gearbox, and a right half-shaft sleeve is disposed on the other side of the main reduction gearbox. A large end gear is mounted at the end of each of the left and right half-shaft sleeves and is assembled within the drive chamber.

[0008] Preferably, connecting plates are installed on both outer walls of the shaft cylinders a and b, and mounting holes are provided on the side walls of the connecting plates. Fasteners are installed in the mounting holes, and fixing plates are installed on the rear side walls of the shaft cylinders a and b.

[0009] Preferably, the fastener includes a fastening screw and an anti-loosening screw. A fastening nut is screwed onto the outside of the fastening screw. An anti-loosening groove is provided at the bottom end of the fastening screw, and the anti-loosening screw is screwed into the anti-loosening groove. An anti-loosening sleeve is sleeved on the outside of the anti-loosening screw. Three limiting posts are installed on the outer wall of the anti-loosening sleeve. The three limiting posts are distributed in a triangle. The inner wall of each limiting post is provided with a spiral groove that cooperates with the fastening screw.

[0010] Preferably, the outer wall of the fastening nut is provided with an annular groove, and the end of the limiting post is disposed in the annular groove.

[0011] Preferably, a retaining ring is fixedly installed on the upper outer end of the fastening screw, and an annular pressure plate, a spring, and an annular rubber sheet are fitted on the circumferential surface of the fastening screw.

[0012] Preferably, both the outer walls of the shaft cylinder a and the shaft cylinder b are provided with oil injection holes, the oil injection holes are connected to the rotating cavity, and a plug is inserted into the oil injection hole.

[0013] Preferably, both the left and right half-shaft sleeves are provided with an anti-rust layer, and the bottom end of the drive cavity is fitted with a rotatable hub assembly housing.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] The front axle assembly of this tractor has a reasonable structural design.

[0016] The tractor's front axle assembly features drive chambers within the left and right wheel hub mounts. Large end gears are mounted on the ends of the left and right half-shaft sleeves connected to the main reduction gearbox, and these end gears are housed within the drive chambers. This structural design enables efficient and stable power transmission from the main reduction gearbox to the wheel hub mounts via the half-shaft sleeves, ensuring continuous power transmission, effectively improving the tractor's power output performance in various operating scenarios, and reducing power loss and the probability of malfunctions during power transmission.

[0017] The bearing housing assembled inside the main spindle housing consists of two opposing shaft cylinders, a and b. The inner walls of shaft cylinders a and b have evenly spaced rotating cavities along the axis, each containing ball bearings. On one hand, shaft cylinders a and b are connected and fixed via connecting plates, mounting holes, and fasteners. This connection method not only facilitates assembly but also enhances the overall structural stability of the bearing housing. On the other hand, the rotating cavities and ball bearings significantly reduce friction during shaft rotation, resulting in smoother rotation of the bearing housing, reduced heat and wear caused by friction, and extended service life of the bearing housing and the entire front axle assembly. Attached Figure Description

[0018] Figure 1 This is a front-view three-dimensional structural schematic diagram of the present invention;

[0019] Figure 2 This is a schematic diagram of the bearing housing of this utility model;

[0020] Figure 3 This is a schematic diagram of part A of the present utility model;

[0021] Figure 4 This is a schematic diagram of the fastener of this utility model.

[0022] In the diagram: 1. Main gearbox housing; 2. Main shaft seat; 3. Bearing seat; 31. Shaft sleeve a; 32. Shaft sleeve b; 33. Fixing plate; 4. Right half shaft sleeve; 5. Left half shaft sleeve; 6. Anti-rust layer; 7. Left wheel hub fixing seat; 8. Right wheel hub fixing seat; 9. Drive cavity; 10. End gear; 11. Wheel hub assembly housing; 12. Connecting plate; 13. Mounting hole; 14. Fastener. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1-4 This utility model provides a technical solution:

[0025] A tractor front axle assembly includes a main reduction gearbox 1 and a left wheel hub mounting seat 7 and a right wheel hub mounting seat 8 disposed at both ends of the main reduction gearbox 1. Both the left wheel hub mounting seat 7 and the right wheel hub mounting seat 8 have drive chambers 9 inside. A main shaft seat 2 is assembled at the front end of the main reduction gearbox 1. A bearing seat 3 is assembled inside the main shaft seat 2. The bearing seat 3 includes a shaft sleeve a31 and a shaft sleeve b32 disposed opposite to each other. Rotating cavities 16 are evenly spaced along the axis of the inner walls of the shaft sleeve a31 and the shaft sleeve b32. Ball bearings 17 are installed inside the rotating cavities 16. A left half-shaft sleeve 5 is disposed on one side of the main reduction gearbox 1, and a right half-shaft sleeve 4 is disposed on the other side of the main reduction gearbox 1. A large end gear 10 is installed at the end of the left half-shaft sleeve 5 and the right half-shaft sleeve 4. The large end gear 10 is assembled in the drive chamber 9.

[0026] The main reduction gearbox 1 is made of high-strength ductile iron using precision casting technology. It houses the main reduction gear set, which reduces and increases the torque of the power transmitted from the engine before transmitting it to the half-shaft. The left and right wheel hub mounting seats 7 and 8 are connected to the main reduction gearbox 1 via flanges, with sealing gaskets at the connection points to prevent lubricant leakage. The drive chamber 9 is a cylindrical cavity structure with precision-machined inner walls, achieving a surface roughness of no more than 0.8 μm to ensure stable operation of the large end gear 10 within the cavity.

[0027] The main reduction gearbox 1 has a length of 350-450mm, a width of 200-250mm, and a height of 180-220mm; the outer diameter of the left wheel hub mounting seat 7 and the right wheel hub mounting seat 8 is 220-280mm, and the diameter of the drive cavity 9 is 180-220mm and the depth is 120-150mm.

[0028] The main spindle housing 2 is fixedly connected to the main gearbox body 1 by welding. It is made of 45# steel and has undergone heat treatment to achieve a hardness of 220-250 HBW. The bearing housing 3's shaft sleeves a31 and b32 are machined from seamless steel pipes and are positioned together by locating pins to ensure assembly accuracy. Sealing grooves are provided on the opposite surfaces of shaft sleeves a31 and b32, and O-ring seals are installed within these grooves to prevent dust and moisture from entering.

[0029] The outer diameter of the spindle seat 2 is 150-180mm, and the length is 100-120mm; the inner diameter of the shaft sleeves a31 and b32 is 80-100mm, the outer diameter is 120-140mm, and the length is 150-180mm; the diameter of the locating pin is 8-10mm, and the length is 30-40mm.

[0030] The rotating cavity 16 has a hemispherical groove structure with rounded corners at the opening to prevent damage to the ball bearing 17 during operation. The ball bearing 17 is made of high-carbon chromium bearing steel (GCr15), and after quenching and tempering, the hardness reaches 60-65HRC. The surface is precision ground, and the roundness error is no more than 0.001mm.

[0031] The diameter of the rotating cavity 16 is 0.1-0.2 mm larger than the diameter of the ball 17. The spacing between the rotating cavities 16 is 15-20 mm. The diameter of the ball 17 is 8-12 mm, and the number of balls is 12-16.

[0032] The left half-shaft sleeve 5 and the right half-shaft sleeve 4 are made of seamless steel pipes by cold drawing. Their interiors are used to install the half-shafts. The left half-shaft sleeve 5 and the right half-shaft sleeve 4 are welded to the main reduction gearbox body 1. The weld joints undergo non-destructive testing to ensure welding quality. The end gear 10 is a spur gear, connected to the half-shaft via a spline. The gear tooth surface undergoes carburizing and quenching treatment, with a carburized layer depth of 0.8-1.2 mm and a tooth surface hardness of 58-62 HRC.

[0033] The outer diameter of the left half-shaft sleeve 5 and the right half-shaft sleeve 4 is 60-80mm, the wall thickness is 8-10mm, and the length is 800-1000mm; the module of the end large gear 10 is 5-8mm, the number of teeth is 30-40, and the tooth tip circle diameter is 160-220mm.

[0034] In this embodiment, connecting plates 12 are installed on both outer walls of shaft cylinder a31 and shaft cylinder b32. The side walls of the connecting plates 12 are provided with mounting holes 13, and fasteners 14 are installed in the mounting holes 13. Fixing plates 33 are installed on the rear side walls of shaft cylinder a31 and shaft cylinder b32.

[0035] The connecting plate 12 is a stamped steel plate and is welded to the shaft cylinders a31 and b32. After welding, stress relief treatment is performed. The mounting hole 13 is a through hole with tapped inner walls to facilitate mating with the fastener 14. The fixing plate 33 is a rectangular steel plate and is bolted to the shaft cylinders a31 and b32 to fix the bearing seat 3 to other components.

[0036] The connecting plate 12 has a thickness of 8-10mm, a length of 100-120mm, and a width of 50-60mm; the mounting holes 13 have a diameter of 12-16mm and a quantity of 2-4; the fixing plate 33 has a thickness of 10-12mm, a length of 150-180mm, and a width of 80-100mm.

[0037] In this embodiment, the fastener 14 includes a fastening screw 18 and an anti-loosening screw 30. A fastening nut 19 is screwed onto the outside of the fastening screw 18. An anti-loosening groove 20 is provided at the bottom end of the fastening screw 18. The anti-loosening screw 30 is screwed into the anti-loosening groove 20. An anti-loosening sleeve 21 is sleeved on the outside of the anti-loosening screw 30. Three limiting posts 22 are installed on the outer wall of the anti-loosening sleeve 21. The three limiting posts 22 are distributed in a triangle. The inner wall of each limiting post 22 is provided with a spiral groove 23 that cooperates with the fastening screw 18.

[0038] Both the fastening screw 18 and the anti-loosening screw 30 are made of 40Cr steel, heat-treated to a hardness of 28-32 HRC, and have a thread precision of 6g. The fastening nut 19 is a hexagonal nut made of No. 35 steel, with a galvanized surface to prevent corrosion. The anti-loosening sleeve 21 is a cylindrical structure made of engineering plastic, possessing good wear resistance and toughness. The limiting post 22 and the anti-loosening sleeve 21 are integrally molded, and the spiral groove 23 matches the thread of the fastening screw 18 to ensure a tight fit between the two.

[0039] The diameter of the fastening screw 18 is 12-16mm and the length is 80-100mm; the diameter of the anti-detachment screw 30 is 8-10mm and the length is 30-40mm; the inner diameter of the anti-detachment cylinder 21 is 0.5-1mm larger than the diameter of the anti-detachment screw 30, the outer diameter is 20-25mm, and the length is 40-50mm; the diameter of the limiting post 22 is 8-10mm and the length is 20-30mm; the pitch of the spiral groove 23 is the same as the pitch of the fastening screw 18.

[0040] In this embodiment, the outer wall of the fastening nut 19 is provided with an annular groove 24, and the end of the limiting post 22 is disposed in the annular groove 24.

[0041] The annular groove 24 is a circular groove with high machining precision and a surface roughness of no more than 1.6μm. The end of the limiting post 22 is a spherical structure that cooperates with the annular groove 24. When the fastening nut 19 rotates, the end of the limiting post 22 can rotate freely within the annular groove 24, serving as a guide and limiting element.

[0042] The width of the annular groove 24 is 5-8mm and the depth is 3-5mm; the diameter of the spherical end of the limiting post 22 is 0.1-0.2mm smaller than the width of the annular groove 24.

[0043] In this embodiment, a retaining ring 25 is fixedly installed on the upper outer end of the fastening screw 18, and an annular pressure plate 27, a spring 29 and an annular rubber sheet 28 are fitted on the circumferential surface of the fastening screw 18.

[0044] The retaining ring 25 is welded to the fastening screw 18 to limit the position of the annular pressure plate 27. The annular pressure plate 27 is a stamped steel plate with a polished surface, providing good flatness. The spring 29 is a cylindrical helical compression spring made of spring steel and tempered, exhibiting good elasticity and fatigue strength. The annular rubber sheet 28 is made of nitrile rubber, providing good sealing and wear resistance, and preventing dust and moisture from entering the fastener.

[0045] The outer diameter of the retaining ring 25 is 10-15 mm larger than the diameter of the fastening screw 18, and its thickness is 3-5 mm; the outer diameter of the annular pressure plate 27 is 5-10 mm larger than the outer diameter of the retaining ring 25, and its thickness is 2-3 mm; the steel wire diameter of the spring 29 is 2-3 mm, the outer diameter is 20-25 mm, and the free length is 30-40 mm; the outer diameter of the annular rubber sheet 28 is the same as the outer diameter of the annular pressure plate 27, and its thickness is 3-5 mm.

[0046] In this embodiment, both the outer walls of the shaft cylinder a31 and the shaft cylinder b32 are provided with oil injection holes 15, which are connected to the rotating cavity 16, and a plug is inserted into the oil injection hole 15.

[0047] The oil filling hole 15 is a tapered hole, and its axis intersects with the axis of the rotating cavity 16, facilitating the smooth flow of lubricating oil into the rotating cavity 16. The plug is made of rubber and is interference-fitted with the oil filling hole 15, providing good sealing performance and preventing lubricating oil leakage.

[0048] The large end diameter of the oil filling hole 15 is 8-10mm, the small end diameter is 5-6mm, and the depth is 15-20mm; the diameter of the plug is 0.2-0.3mm larger than the large end diameter of the oil filling hole 15.

[0049] In this embodiment, both the left half-shaft sleeve 5 and the right half-shaft sleeve 4 are provided with an anti-rust layer 6, and the bottom end of the drive cavity 7 is provided with a rotatable hub assembly housing 11.

[0050] The anti-rust layer 6 is made using an electro-galvanizing process, with a coating thickness of 8-12μm. The surface is passivated, which effectively improves the corrosion resistance of the axle sleeve. The wheel hub assembly housing 11 is made of cast iron and houses the wheel hub bearing and braking device. It is connected to the bottom cylindrical structure of the drive chamber 9 via a bearing, allowing for free rotation.

[0051] The adhesion of the anti-rust layer 6 of the left half-shaft sleeve 5 and the right half-shaft sleeve 4 is not less than 5 N / cm2; the outer diameter of the hub assembly housing 11 is 300-350 mm, the length is 200-250 mm, and the fitting clearance between it and the bottom cylindrical structure of the drive cavity 9 is 0.1-0.2 mm.

[0052] To better understand this technical solution, the following points are briefly explained:

[0053] I. Overall Power Transmission Process

[0054] The power output from the engine is first transmitted to the main reduction gearbox 1. Inside the main reduction gearbox 1, the main reduction gear set reduces speed and increases torque through gear meshing, and then transmits the power to the half-shafts inside the left half-shaft sleeve 5 and the right half-shaft sleeve 4 after adjusting the power direction. The half-shafts rotate inside the sleeves, driving the end gear 10 at the end to rotate synchronously. The end gear 10 operates in the drive chambers 9 of the left wheel hub fixing seat 7 and the right wheel hub fixing seat 8, and then drives the wheels to rotate through the wheel hub assembly housing 11, thus realizing the movement of the tractor.

[0055] II. Working Principle of Key Components

[0056] 1. The synergistic effect of the main reduction gearbox and the wheel hub mounting base

[0057] The main reduction gearbox 1 is made of high-strength ductile iron, and the installation accuracy of the internal gear set is ensured by precision casting. The axial and radial forces generated when the gear set meshes are borne by the gearbox. The left hub mounting seat 7 and the right hub mounting seat 8 connected by flanges ensure that the lubricating oil does not leak through the sealing gaskets. The precision machining of the inner wall of the drive cavity 9 (roughness ≤0.8μm) provides a stable operating space for the end gear 10 and reduces the friction interference between the gear and the cavity wall.

[0058] 2. Rotational support principle of bearing housing

[0059] The main spindle seat 2 is welded to the front end of the main gearbox 1. Its internal bearing seat 3 consists of a shaft sleeve a31 and a shaft sleeve b32, which are positioned by locating pins and fixed by fasteners 14 on the connecting plate 12 to ensure coaxiality. The rotating cavity 16 on the inner wall of the shaft sleeve forms a rolling friction pair with the balls 17, which reduces friction by more than 70% compared to sliding friction. When the main spindle rotates, the balls 17 roll within the rotating cavity 16, and the lubricating oil injected through the oil injection hole 15 forms an oil film, further reducing wear and improving rotational efficiency.

[0060] 3. Fastener anti-loosening and tightening mechanisms

[0061] After the fastening screw 18 passes through the mounting hole 13 of the connecting plate 12, it is initially fixed by the fastening nut 19. The anti-loosening screw 30 is screwed into the anti-loosening groove 20 at the bottom of the fastening screw. Its external anti-loosening sleeve 21 engages with the spiral groove 23 of the fastening screw through three triangularly distributed limiting posts 22, forming a mechanical anti-loosening structure. When the tractor vibration causes the fastening nut 19 to loosen, the end of the limiting post 22 rotates in the annular groove 24 and generates a reverse torque. Combined with the preload of the spring 29 (the compression is controlled at 1 / 3-1 / 2 of the free length), it can effectively prevent the fastener from loosening and ensure the connection stability between the bearing seat and the main shaft seat.

[0062] 4. Protection and power transmission of the half-shaft sleeve

[0063] The left half-shaft sleeve 5 and the right half-shaft sleeve 4 are made of cold-drawn seamless steel pipes. The external electro-galvanized anti-rust layer 6 (thickness 8-12μm) can resist corrosion in the humid environment of farmland, and the salt spray resistance after passivation treatment reaches more than 48 hours. When the half-shaft rotates at high speed inside the sleeve, the sleeve is rigidly connected to the main reduction gearbox body by welding, bearing the radial force in the torque transmission process, ensuring the straight transmission of power from the main reduction gearbox to the wheel hub, and the straightness error is controlled within 0.5mm / m.

[0064] 5. Rotation drive of the wheel hub assembly

[0065] The cylindrical structure at the bottom of the drive chamber 9 is connected to the hub assembly housing 11 via bearings, with the clearance controlled at 0.1-0.2mm to ensure rotational flexibility while preventing radial wobble. The large end gear 10 meshes with the planetary gear set inside the hub, further reducing the power transmitted by the half-shaft to drive the hub to rotate. At the same time, the braking device inside the hub assembly housing 11 can brake the wheels through the contact between the friction pads and the brake drum, completing the deceleration or stopping action of the tractor.

[0066] III. Characteristics of System Collaborative Work

[0067] The components are structurally designed to form an organic whole: the main gearbox is responsible for power conversion, the bearing housing provides precise rotational support, fasteners ensure reliable connections, the axle sleeve enables long-distance power transmission, and the wheel hub mount completes the final power transfer to the wheels. In the complex road conditions of farmland operations, the rolling friction structure reduces energy loss, multiple anti-loosening designs enhance vibration resistance, and the anti-rust coating extends service life, all working together to achieve efficient and stable operation of the tractor's front axle.

[0068] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0069] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A tractor front axle assembly, comprising a main reduction gearbox (1) and a left wheel hub mounting seat (7) and a right wheel hub mounting seat (8) disposed at both ends of the main reduction gearbox (1), characterized in that, The left wheel hub mounting base (7) and the right wheel hub mounting base (8) are provided with drive cavities (9); The front end of the main gearbox (1) is equipped with a main shaft seat (2), and a bearing seat (3) is installed inside the main shaft seat (2). The bearing seat (3) includes a shaft cylinder a (31) and a shaft cylinder b (32) arranged opposite to each other. The inner walls of the shaft cylinders a (31) and b (32) are provided with rotating cavities (16) evenly spaced along their axis, and ball bearings (17) are installed inside the rotating cavities (16). A left half-shaft sleeve (5) is provided on one side of the main gearbox (1), and a right half-shaft sleeve (4) is provided on the other side of the main gearbox (1). A large end gear (10) is installed at the ends of the left half-shaft sleeve (5) and the right half-shaft sleeve (4), and the large end gear (10) is assembled in the drive cavity (9).

2. A tractor front axle assembly according to claim 1, characterized in that, Connecting plates (12) are installed on both outer walls of the shaft cylinder a (31) and shaft cylinder b (32). The side walls of the connecting plates (12) are provided with mounting holes (13). Fasteners (14) are installed in the mounting holes (13). Fixing plates (33) are installed on the rear side walls of the shaft cylinder a (31) and shaft cylinder b (32).

3. A tractor front axle assembly according to claim 2, characterized in that, The fastener (14) includes a fastening screw (18) and an anti-loosening screw (30). A fastening nut (19) is screwed onto the outside of the fastening screw (18). An anti-loosening groove (20) is provided at the bottom end of the fastening screw (18). The anti-loosening screw (30) is screwed into the anti-loosening groove (20). An anti-loosening sleeve (21) is sleeved on the outside of the anti-loosening screw (30). Three limiting posts (22) are installed on the outer wall of the anti-loosening sleeve (21). The three limiting posts (22) are arranged in a triangle. The inner wall of each limiting post (22) is provided with a spiral groove (23) that cooperates with the fastening screw (18).

4. A tractor front axle assembly according to claim 3, characterized in that, The outer wall of the fastening nut (19) is provided with an annular groove (24), and the end of the limiting post (22) is located in the annular groove (24).

5. A tractor front axle assembly according to claim 3, characterized in that, A retaining ring (25) is fixedly installed on the upper outer end of the fastening screw (18), and an annular pressure plate (27), a spring (29) and an annular rubber sheet (28) are fitted on the circumferential surface of the fastening screw (18).

6. A tractor front axle assembly according to claim 1, characterized in that, Both the outer walls of the shaft cylinder a (31) and the shaft cylinder b (32) are provided with oil injection holes (15), the oil injection holes (15) are connected to the rotating cavity (16), and a plug is inserted into the oil injection hole (15).

7. A tractor front axle assembly according to claim 1, characterized in that, The left half-shaft sleeve (5) and the right half-shaft sleeve (4) are both provided with an anti-rust layer (6), and the bottom end of the drive cavity (9) is fitted with a rotatable hub assembly shell (11).

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