Rear double-wheel connecting sleeve and tractor

Abstract

The utility model relates to agricultural machinery field, more particularly, relate to a rear double wheel connecting sleeve and tractor, include: first flange plate, the appearance of first flange plate is plum blossom and forms plum blossom flange plate, and is equipped with a plurality of blind hole type screw hole for fixed outer wheel, second flange plate is used for with tractor rear axle flange plate fixed connection, sleeve, its both ends are with first flange plate and second flange plate welding connection, at least one reinforcing rib, the reinforcing rib is with first flange plate, sleeve and / or second flange plate welding, wherein, the side of sleeve near second flange plate is equipped with long circular groove, is used for allowing torque tool to pass through and to inner wheel fastening nut carry out and add twist operation. It can solve the problem of inconveniently beating torque when installing connecting sleeve in prior art, solve the problem of high cost of casting connecting sleeve mold.

Description

Technical Field

[0001] This utility model relates to the field of agricultural machinery, and more specifically, to a rear double wheel connecting sleeve and a tractor. Background Technology

[0002] (1) Current status of the industry and root causes of problems As an important piece of agricultural machinery, the design of the tractor's transmission system and running gear directly affects its operating efficiency and service life. In heavy-duty tractor design, a flange-type structure connecting two tires on the rear axle has become a common configuration. This design requires a connecting sleeve to securely mount the outer wheels. As a key connecting component, the connecting sleeve's structural design must simultaneously meet three basic requirements: first, accurately ensuring the standard wheelbase between the two wheels to guarantee vehicle stability; second, possessing sufficient structural strength to withstand alternating loads under complex working conditions; and third, facilitating quick disassembly and maintenance in field operations. In high-horsepower or heavy-duty tractors, a rear dual-wheel (dual-tire) layout is often used to improve traction and stability. Under this structure: The inner wheel is directly mounted on the drive axle (rear axle) flange; The outer wheel needs to be fixed to the outside by an intermediate connecting device, which is called a "connecting sleeve".

[0003] The core function of the connecting sleeve: Achieve axial positioning between the outer and inner wheels (control wheel track); It can withstand complex loads (bending moment, torque, impact force, etc.) during vehicle operation. It provides a reliable bolt fastening interface to ensure that both the inner and outer wheels can be securely locked.

[0004] (2) The main forms and defects of existing technologies In traditional flanged dual-fuse configurations, the connecting sleeve is typically manufactured using either disc welding or integral casting processes. While these two manufacturing methods ensure component strength, they have significant limitations in practical applications: 1. Disc welding type: Due to structural limitations, it is inconvenient to apply torque when installing the connecting sleeve during installation; 2. Integral casting: The casting process requires the development of special molds, resulting in high production costs.

[0005] These problems are particularly prominent under the high-load and high-frequency use of agricultural machinery, directly affecting the reliability and ease of maintenance of tractors. Utility Model Content

[0006] The purpose of this utility model is to provide a rear double wheel connecting sleeve, which can solve at least one technical problem existing in the prior art to a certain extent.

[0007] The technical solution of this utility model is implemented as follows: A rear dual-wheel connecting sleeve, comprising: The first flange is shaped like a plum blossom to form a plum blossom flange, and has multiple blind threaded holes for fixing the outer wheel. The second flange is used for fixed connection with the tractor rear axle flange. The sleeve is welded to the first flange and the second flange at both ends, respectively; At least one reinforcing rib is welded to the first flange, the sleeve, and / or the second flange; The sleeve has an elongated groove on the side near the second flange to allow a torque tool to pass through and apply torque to the inner wheel fastening nut.

[0008] Furthermore, the first flange is made of Q355B steel plate with a thickness of 50-60mm.

[0009] Furthermore, the sleeve is made of hot-rolled seamless steel pipe with an outer diameter of 273 mm and a wall thickness of 12 mm.

[0010] Furthermore, the second flange is provided with eight mounting through holes with a diameter of 23 mm and at least two through holes with a diameter of 40-50 mm, wherein the through holes are used to allow the connecting bolts to pass smoothly through and to assemble the connecting sleeve when the inner wheel is installed.

[0011] Furthermore, the reinforcing rib includes: The first reinforcing rib connects the first flange, the sleeve, and the second flange simultaneously. And / or a second reinforcing rib, connecting the first flange to the sleeve.

[0012] Furthermore, the reinforcing rib is made of Q355B steel plate with a thickness of 14-18mm.

[0013] Furthermore, ten blind threaded holes are evenly opened on the first flange, and an arc-shaped groove is opened on the outer wall of the first flange between two adjacent blind threaded holes to form a plum blossom-shaped flange.

[0014] Furthermore, the reinforcing rib is provided with lifting holes for workshop handling and assembly positioning.

[0015] A tractor includes the aforementioned rear dual-wheel connecting sleeve, the connecting sleeve being disposed on the rear axle of the tractor for connecting the outer wheel and forming a dual-tire structure with the inner wheel.

[0016] Furthermore, the inner wheel is pre-installed on the rear axle flange, and then bolts are tightened through the elongated groove and large-diameter through hole on the connecting sleeve, realizing modular step-by-step assembly.

[0017] Compared with the prior art, the beneficial effects of this utility model are: 1. The first flange is designed as a quincunx flange – solving the problem of twisting. Its shape is plum blossom-like (polygonal outline), not a traditional circle. Its function is: Provides multiple flat surfaces for the torque bar or special wrench to engage, preventing slippage; Significantly improves on-site repair and assembly efficiency, especially in space-constrained environments; It can be used with a standard torque tool for precise pre-tightening.

[0018] 2. Blind hole threaded hole design on the first flange – breaking through the bottleneck of structural reinforcement The threaded hole on the first flange is a blind hole (not a through hole), which does not penetrate the entire flange thickness. Its advantages are: Retain the complete metal surface on the back of the flange; The reinforcing ribs are allowed to be extended from the back of the first flange and welded to the sleeve to form a continuous force transmission path; To avoid stress concentration and weld interruption caused by through-hole cutting.

[0019] 3. The elongated groove design on the sleeve facilitates the inner wheel torque application. An elongated oval groove (elongated hole) is made on the side of the sleeve near the second flange. The purpose of this is: After the inner wheel is installed on the rear axle, a torque socket tool can be inserted through this slot to tighten or loosen the inner wheel fastening nut; Avoid the reverse operation of "installing the sleeve first and then the inner wheel" due to obstruction by the connecting sleeve; Improve assembly processes and enhance operational convenience.

[0020] This design supports a reasonable assembly sequence of "installing the inner wheel first, then installing the connecting sleeve, and finally installing the outer wheel". Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1This is an isometric view of the rear double wheel connecting sleeve of this utility model; Figure 2 This is a front view of the rear double wheel connecting sleeve of this utility model; Figure 3 This is a side view of the rear double wheel connecting sleeve of this utility model; Figure 4 This is a schematic diagram of the structure of this utility model installed on the rear axle of a tractor.

[0023] In the picture: 1-First flange; 2-Sleeve; 3-First reinforcing rib; 4-Second reinforcing rib; 5-Second flange; 100 - Blind threaded hole; 1001 - First threaded hole; 1002 - Second threaded hole; 1003 - Third threaded hole; 1004 - Fourth threaded hole; 101 - Large boss; 102 - Small boss; 103 - Arc-shaped groove; 301 - Lifting hole; 302 - Inverted trapezoidal groove; 501 - Installation through hole. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0026] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0027] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0028] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0029] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0031] like Figures 1 to 4 As shown, this application provides a novel rear dual-wheel connecting sleeve and a tractor using the connecting sleeve, particularly suitable for dual-tire wheel hub mounting systems of medium and large agricultural tractors equipped with flange-type rear axles. The connecting sleeve, as a transitional connection component between the inner and outer wheels, undertakes multiple functions including torque transmission, axial positioning, and structural support.

[0032] A rear dual-wheel connecting sleeve, comprising: The first flange 1 is shaped like a plum blossom to form a plum blossom flange, and is provided with multiple blind threaded holes 100 for fixing the outer wheel. The second flange 5 is used for fixed connection with the tractor rear axle flange; The sleeve 2 is welded to the first flange 1 and the second flange 5 at both ends, respectively. At least one reinforcing rib is welded to the first flange 1, the sleeve 2 and / or the second flange 5; Among them, the sleeve 2 has an elongated groove on the side near the second flange 5, which allows a torque tool to pass through and tighten the inner wheel nut.

[0033] This structural design solves a series of problems such as "difficulty in twisting, inability to strengthen, and inconvenience in assembly," and represents a significant improvement.

[0034] The first flange 1 is made of Q355B steel plate with a thickness of 50-60mm.

[0035] The casing 2 is made of hot-rolled seamless steel pipe with an outer diameter of 273mm and a wall thickness of 12mm.

[0036] The second flange 5 is provided with eight mounting through holes 501 with a diameter of 23mm, and at least two through holes with a diameter of 40-50mm. The through holes are used to allow the connecting bolts to pass smoothly through and to assemble the connecting sleeve when the inner wheel has been installed. That is, it is used to fix the inner wheel and facilitate the assembly of the connecting sleeve.

[0037] The reinforcing ribs include: The first reinforcing rib 3 connects the first flange 1, the sleeve 2, and the second flange 5 simultaneously. And / or the second reinforcing rib 4, connecting the first flange 1 and the sleeve 2.

[0038] The first reinforcing rib 3 is made of Q355B steel plate with a thickness of 14-18mm, and the first reinforcing rib 3 is provided with lifting holes 301 for workshop handling and assembly positioning.

[0039] Specifically, ten blind threaded holes 100 are evenly opened on the first flange 1, and an arc-shaped groove 103 is opened on the outer side wall of the first flange 1 between two adjacent blind threaded holes 100 to form a plum blossom-shaped flange.

[0040] Example 1 In this embodiment, the rear double wheel connecting sleeve adopts an integrated structural design of separate manufacturing and overall welding, consisting of five main components: first flange 1, sleeve 2, first reinforcing rib 3, second reinforcing rib 4, and second flange 5. After each component is machined and formed, it is assembled, positioned, and then fully welded to form an integrated connecting device with high strength and high reliability.

[0041] I. Structural Design of the First Flange The first flange 1 is a key interface component for connecting the outer wheel. Its main body is cut from a 55mm thick Q355B low-alloy high-strength structural steel plate. The flange has a quincunx shape, with multiple evenly distributed arc-shaped grooves 103 and bosses on the edge, forming a polygonal toothed profile. This facilitates stable engagement with torsion bars or special sleeve tools, and allows for smooth bolt tightening even in narrow spaces, effectively solving the technical problem of difficulty in applying torque with traditional circular flanges.

[0042] Multiple sets of threaded holes are formed on the end face of the first flange 1, preferably eight M20 fine-pitch blind holes with a depth of approximately 40 mm, which do not penetrate the entire flange plate. These blind holes are used to fix the outer wheel rim to the connecting sleeve using high-strength bolts. Because of the blind hole design instead of through holes, the continuous metal structure on the back of the flange is preserved, thus providing the necessary connection area for subsequent welding of reinforcing ribs and avoiding structural weakening and welding interruption problems caused by through holes.

[0043] Specifically, the direction of the central axis of the connecting sleeve as a whole and the direction of the central axis of the two flanges are both the first direction (x-axis), such as... Figure 2 and Figure 3 As shown, a spatial rectangular coordinate system oxyz is established. Among the ten blind threaded holes 100, including the first threaded hole 1001, the second threaded hole 1002, the third threaded hole 1003, and the fourth threaded hole 1004, the first threaded hole 1001 and the second threaded hole 1002 are adjacent and symmetrical about the z-axis, and the third threaded hole 1003 and the fourth threaded hole 1004 are adjacent and symmetrically arranged. The first threaded hole 1001 and the third threaded hole 1003, as well as the second threaded hole 1002 and the fourth threaded hole 1004, are all symmetrical about the y-axis. Except for the first threaded hole 1001 and the second threaded hole 1002, which do not have an arc-shaped groove 103, and the third threaded hole 1003 and the fourth threaded hole 1004, all other adjacent blind threaded holes 100 have an arc-shaped groove 103 between them. The boss is divided into a large boss 101 and a small boss 102. The first threaded hole 1001 and the second threaded hole 1002 are both located on the large boss 101, and the third threaded hole 1003 and the fourth threaded hole 1004 are both located on the other large boss 101. The other blind threaded holes 100 are each located on a small boss 102. In the x-axis direction, the arc-shaped grooves 103 on the first flange 1 correspond one-to-one with the mounting through holes 501 on the second flange 5.

[0044] II. Structure of Sleeve 2 and its Functional Grooving The sleeve 2 is the main load-bearing component of the connecting sleeve. It is made of hot-rolled seamless steel pipe with a specification of Φ273mm×12mm, and the material is 20# steel, Q345B or Q345B, which has excellent compressive strength, bending strength and fatigue resistance. The two ends of the sleeve 2 are respectively fitted onto the outer circumferential surface of the first flange 1 and the second flange 5, and are firmly connected by annular fillet welds.

[0045] Specifically, an elongated groove is provided axially on the wall of the sleeve 2 near the second flange 5. The groove is preferably 100mm long and 25mm wide, and is a rectangular through-slot with semicircles at both ends. The purpose of this elongated groove is to allow the operator to make a closer contact between the extended torque sleeve or the inner wall of the Allen wrench and the nut when the connecting sleeve is installed on the tractor rear axle, greatly improving the safety and convenience of on-site assembly and maintenance.

[0046] III. Installation and Adaptation Design of Second Flange 5 The second flange 5 is used to fix the entire connecting sleeve to the output flange of the tractor rear axle. Its main body is machined from 30mm thick Q355B steel plate. This flange has two types of mounting holes: Eight mounting through holes 501 with a diameter of Φ23mm are evenly distributed around the circumference and are used to fasten it to the rear axle flange with high-strength bolts; Two Φ45mm diameter through holes are symmetrically arranged on the circumference. The inner wheel is pre-assembled by inserting two bolts into the through holes and fixing it to the rear axle flange. Then, the two Φ45mm through holes on the connecting sleeve are aligned with the two pre-installed bolts, and eight bolts are inserted into the mounting through holes 501 to fix it to the rear axle flange, thus securing the connecting sleeve. This ensures the smooth execution of the standardized assembly process of "installing the inner wheel first—installing the connecting sleeve next—installing the outer wheel last," while also guaranteeing safety during assembly and disassembly. Note that in this assembly method, the two larger diameter bolts are pre-tightened first, then the eight smaller diameter bolts are installed and tightened, and finally all bolts are tightened together. This assembly method is called the "step-by-step tightening method" or "pre-tightening-final tightening method." This assembly method ensures that the pre-tightening force of all bolts in the connecting pair is uniform and consistent, thereby guaranteeing the sealing of the mating surfaces and the reliability of the connection.

[0047] The second flange 5 and the sleeve 2 are also connected by full-circumference fillet welds to ensure connection strength and concentricity.

[0048] IV. Reinforcing Rib Structure Layout To compensate for the potential lack of rigidity of welded structures compared to integral castings, this application incorporates two sets of reinforcing ribs to enhance the overall structure's resistance to torsion, bending, and fatigue life.

[0049] The first reinforcing rib 3 is made of 16mm thick Q355B steel plate and has a rectangular, triangular, or trapezoidal plate structure. Preferably, the first reinforcing rib 3 is a rectangular plate with an inverted trapezoidal groove 302 on the side away from the sleeve in the middle. The sidewalls of the inverted trapezoidal groove 302 are all designed with a smooth curved surface structure. One end of the first reinforcing rib 3 is welded to the back of the first flange 1, the middle part is attached to the outer wall of the sleeve 2, and the other end extends to the vicinity of the end face of the second flange 5 and is welded thereon, forming a continuous support structure bridging the three main components. This reinforcing rib significantly improves the overall rigidity of the connecting sleeve, especially when subjected to eccentric loads or impact loads.

[0050] In addition, two through holes with a diameter of Φ16mm are symmetrically opened on both sides of the first reinforcing rib 3, which can be used to attach hooks during workshop hoisting and transportation, and also serve as process auxiliary functions.

[0051] The second reinforcing rib 4 is also made of 16mm thick Q355B steel plate and is arranged at the root area of ​​the connection between the first flange 1 and the sleeve 2. It is welded radially and is mainly used to disperse the stress concentration phenomenon in this part and prevent the weld from cracking due to repeated vibration.

[0052] Multiple first reinforcing ribs 3 and multiple second reinforcing ribs 4 are circumferentially distributed on the outer wall of the sleeve, and the first reinforcing ribs 3 and the second reinforcing ribs 4 are intersected, further improving the strength of the connection structure.

[0053] All welds are made using manual arc welding or CO2 gas shielded welding, with a weld leg height of not less than 10mm. Visual inspection and local non-destructive testing are also performed to ensure that the welding quality meets the safety requirements for heavy-load operation of agricultural machinery.

[0054] V. Assembly and Working Process of the Complete Machine In practical applications, the assembly process of the connecting sleeve described in this application for a tractor rear axle dual-tire configuration system is as follows (briefly explained): 1. Install the inner wheel onto the rear axle output shaft and initially tighten the hub nut. Insert the two bolts into the through holes and fix them onto the flange (do not tighten). Perform pre-assembly or preliminary assembly. 2. Align the second flange 5 with the rear axle flange and secure it with eight M22 bolts; 3. Adjust the position of the connecting sleeve so that the elongated groove is aligned with the nut to be operated; 4. Using an extended torque sleeve, pass through the inside of sleeve 2 and, with the help of the space window of the elongated groove, tighten the inner wheel nut to the final set torque. 5. Install the outer wheel and secure it with M22 bolts through the blind threaded holes on the first flange 1; 6. Finally, complete the connection of the entire dual-wheel system.

[0055] Throughout operation, the connecting sleeve not only transmits the power torque from the engine but also withstands the vehicle's weight, dynamic impacts from bumps in the field, and lateral forces during cornering. Thanks to the excellent load-bearing characteristics of the plum blossom-shaped flange and the structural design that combines blind hole threads with reinforcing ribs, this application significantly reduces manufacturing costs and maintenance difficulty while ensuring safety.

[0056] VI. Description of Alternative Implementation Methods (Expandability) Although the above embodiments are the optimal solutions of this application, those skilled in the art can make various equivalent modifications without departing from the spirit of this application. For example: The plum blossom shape of the first flange 1 can be replaced with a dodecagonal, star-shaped or polygonal structure, as long as the tool can be effectively engaged. Blind threaded holes can be replaced with stepped holes or countersunk threaded holes to achieve the same space avoidance effect; The number and shape of the reinforcing ribs can be adjusted according to the specific stress conditions, such as adding a second first reinforcing rib 3 or using a ring-shaped reinforcing rib; The elongated groove on the sleeve 2 can be located at other axial positions, or multiple grooves can be provided to adapt to the layout requirements of different vehicle models; The overall structure can also be used in other scenarios that require two-wheel connection, such as construction machinery and transport vehicles.

[0057] Example 2 A tractor includes a rear dual-wheel connecting sleeve, which is disposed on the rear axle of the tractor and used to connect the outer wheel and form a dual-tire structure with the inner wheel. The inner wheel is pre-installed on the rear axle flange, and then bolts are tightened through the elongated groove and large-diameter through hole on the connecting sleeve, realizing modular step-by-step assembly.

[0058] The beneficial effects of the technical solution of this utility model are: (1) Plum blossom-shaped first flange 1 - Solving the problem of twisting Its shape is plum blossom-like (polygonal outline), not a traditional circle.

[0059] effect: Provides multiple flat surfaces for the torque bar or special wrench to engage, preventing slippage; Significantly improves on-site repair and assembly efficiency, especially in space-constrained environments; It can be used with a standard torque tool for precise pre-tightening.

[0060] (2) Blind hole type threaded hole 100 design - breaking through the bottleneck of structural reinforcement The threaded hole on the first flange 1 is a blind hole (not a through hole) and does not penetrate the entire flange thickness.

[0061] Advantages: Retain the complete metal surface on the back of the flange; The second reinforcing rib 4 can be extended from the back of the first flange 1 and welded to the sleeve 2 to form a continuous force transmission path; To avoid stress concentration and weld interruption caused by through-hole cutting.

[0062] (3) The elongated groove design on sleeve 2 facilitates the inner wheel torque operation. An elongated groove (elongated hole) is made on the side of sleeve 2 near the second flange 5.

[0063] Purpose: When the connecting sleeve is installed on the rear axle of a tractor, it allows the operator to make a closer contact between the inner wall of the extended torque sleeve or the inner wall of the Allen wrench and the nut, greatly improving the safety and convenience of on-site assembly and maintenance.

[0064] (4) Double-layer stiffening system – comprehensively improves structural stiffness First stiffener 3: connects the first flange 1, sleeve 2, and second flange 5, and undertakes the main tasks of resisting bending and torsion; Second reinforcing rib 4: Specifically used to connect the first flange 1 and the sleeve 2, reinforcing the high-stress area (near the outer wheel loading point). Both are cut from 16mm thick Q355B steel plates, possessing excellent tensile and compressive strength. The biomimetic skeletal reinforcement, similar to a bridge truss structure, uses triangular supports at key nodes to maximize load distribution.

[0065] (5) Special hole design for the second flange 5 – compatible with installation sequence It has 8 through holes with a diameter of φ23 for connecting the rear axle flange; Two additional φ45 through holes are provided to allow for the insertion of the fixing bolts of the connecting sleeve even after the inner wheel is installed. This enables a flexible assembly strategy of "installing the inner wheel first and then the sleeve," greatly improving the overall assembly efficiency.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A rear double wheel connecting sleeve, characterized in that, include: The first flange (1) is shaped like a plum blossom to form a plum blossom flange and is provided with multiple blind threaded holes (100) for fixing the outer wheel. The second flange (5) is used for fixed connection with the rear axle flange of the tractor; The sleeve (2) is welded to the first flange (1) and the second flange (5) at both ends respectively; At least one reinforcing rib is welded to the first flange (1), the sleeve (2) and / or the second flange (5); The sleeve (2) has an elongated groove on the side near the second flange (5) to allow a torque tool to pass through and to tighten the inner wheel nut.

2. The rear dual-wheel connecting sleeve according to claim 1, characterized in that, The first flange (1) is made of Q355B steel plate with a thickness of 50-60mm.

3. The rear dual-wheel connecting sleeve according to claim 1, characterized in that, The casing (2) is a hot-rolled seamless steel pipe with an outer diameter of 273 mm and a wall thickness of 12 mm.

4. The rear dual-wheel connecting sleeve according to claim 1, characterized in that, The second flange (5) is provided with eight mounting through holes (501) with a diameter of 23 mm, and at least two through holes with a diameter of 40-50 mm, wherein the through holes are used to allow the connecting bolts to be smoothly inserted and to assemble the connecting sleeve when the inner wheel is installed.

5. The rear dual-wheel connecting sleeve according to claim 1, characterized in that, The reinforcing ribs include: The first reinforcing rib (3) connects the first flange (1), the sleeve (2), and the second flange (5). And / or the second reinforcing rib (4), connecting the first flange (1) and the sleeve (2).

6. The rear dual-wheel connecting sleeve according to claim 1, characterized in that, The reinforcing ribs are made of Q355B steel plates with a thickness of 14-18mm.

7. The rear dual-wheel connecting sleeve according to claim 1, characterized in that, The first flange (1) has ten blind threaded holes (100) evenly opened on it, and an arc groove (103) is opened on the outer wall of the first flange (1) between two adjacent blind threaded holes (100) to form a plum blossom-shaped flange.

8. The rear dual-wheel connecting sleeve according to claim 1, characterized in that, The reinforcing rib is provided with a lifting hole (301) for workshop handling and assembly positioning.

9. A tractor, characterized in that, The rear dual-wheel connecting sleeve, as described in any one of claims 1 to 8, is disposed on the rear axle of a tractor and is used to connect the outer wheel and form a dual-tire structure with the inner wheel.

10. The tractor according to claim 9, characterized in that, The inner wheel is pre-installed on the rear axle flange, and then bolts are tightened through the elongated groove and large-diameter through hole on the connecting sleeve, realizing modular step-by-step assembly.

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