Circumferential limiting mechanism for sliding bearing and gear support

Abstract

The utility model provides a circumferential limiting mechanism for a sliding bearing and a gear support. The circumferential limiting mechanism comprises the gear support, a planetary gear assembly, the sliding bearing, a winding drum and a limiting bush. A mounting opening is formed in the gear support, the sliding bearing is in transmission connection with the planetary gear assembly, the winch cylinder is arranged on the sliding bearing in a sleeving mode, the limiting bush is installed between the winch cylinder and the mounting opening in a pressed mode and is of an unclosed annular structure with a press-fitting fracture, and a connecting belt is arranged in the press-fitting fracture. The two ends of the connecting belt are connected to the sections of the two sides of the press-fitting fracture correspondingly, a limiting structure is arranged between the outer circumferential wall of the limiting bush and the inner circumferential wall of the mounting opening, and circumferential limiting fit is achieved through the limiting structure. The limiting bush has the advantages that the limiting bush is provided with the press-fitting fracture, so that the limiting bush has certain elasticity, quick and accurate press-fitting is facilitated, the integral structural integrity of the limiting bush can be kept through the connecting belt, shrinkage deformation of the limiting bush during press-fitting is not affected, and press-fitting convenience is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of winch technology, and more specifically, to a circumferential limiting mechanism for a sliding bearing and gear support. Background Technology

[0002] In mechanical winches, the reliability of the circumferential positioning of the sliding bearing, gear support, and winch drum directly affects the transmission efficiency and service life of the equipment. Existing winch structures typically include a gear support, planetary gear assembly, sliding bearing, winch drum, and positioning bushing. The gear support has a gear mounting cavity; the planetary gear assembly is installed within the gear mounting cavity; an installation port is provided on the end face of the gear support near the winch drum, extending axially and communicating with the gear mounting cavity; the sliding bearing is drively connected to the planetary gear assembly and is coaxially positioned at the installation port; the current winch drum includes a drum body and baffles symmetrically arranged on both sides, with the drum body fitted onto the sliding bearing, and the positioning bushing press-fitted between the winch drum and the installation port.

[0003] However, existing limiting bushings are mostly complete circular ring structures, and their assembly relies on interference fits with the winch drum and mounting port to ensure the limiting effect. This design has several drawbacks: First, interference fits require extremely high precision machining of parts, necessitating strict control of dimensional tolerances for each component, significantly increasing manufacturing costs; second, during press-fitting, the complete circular ring structure of the limiting bushing lacks elastic adjustment space, making it prone to deformation, wear, or even damage due to uneven force, directly affecting product lifespan; third, disassembly and assembly are inconvenient. When internal parts malfunction and require repair or replacement, the interference fit limiting bushing is difficult to disassemble quickly, increasing maintenance difficulty and potentially causing secondary damage to surrounding components during disassembly.

[0004] Therefore, the existing circumferential limiting mechanism of the sliding bearing and gear support of the winch can no longer meet the equipment's requirements for ease of assembly, reliability of use and economy of maintenance. An optimized limiting structure is urgently needed to solve the above technical problems. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a circumferential limiting mechanism for sliding bearings and gear supports. This structure solves the problems of high processing requirements, easy damage during assembly, inconvenient disassembly and assembly, and poor limiting reliability of existing complete circular ring limiting bushings through innovative design of the limiting bushing, thereby achieving stable limiting of each component, convenient assembly and efficient maintenance.

[0006] To achieve the purpose of this utility model, the following technical solution is adopted:

[0007] A circumferential limiting mechanism for a sliding bearing and gear support includes a gear support, a planetary gear assembly, a sliding bearing, a winch drum, and a limiting bushing. The gear support has a gear mounting cavity, and the planetary gear assembly is mounted within the gear mounting cavity. An mounting opening is provided on the end face of the gear support near the winch drum, extending axially and communicating with the gear mounting cavity. The sliding bearing is drively connected to the planetary gear assembly and is coaxially positioned at the mounting opening. One end of the winch drum is coaxially sleeved on the sliding bearing. The limiting bushing is coaxially press-fitted between the outer circumferential wall of the winch drum and the inner circumferential wall of the mounting opening. The limiting bushing has an open annular structure with a press-fit break. A connecting band is provided within the press-fit break, with both ends of the connecting band connected to the two sides of the press-fit break. A limiting structure is provided between the outer circumferential wall of the limiting bushing and the inner circumferential wall of the mounting opening, achieving circumferential limiting fit through the limiting structure. This structure features a press-fit break in the limiting bushing, giving it a certain degree of elasticity. This facilitates quick and precise press-fitting between the winch drum and the mounting port, improving assembly convenience. Furthermore, the connecting strap maintains the overall structural integrity of the limiting bushing, preventing storage and handling difficulties caused by the break separation before press-fitting (preventing deformation of the limiting bushing during storage or handling). It also does not affect the shrinkage deformation of the limiting bushing during press-fitting, ensuring smooth press-fitting operation. At the same time, it prevents misalignment of the two sides of the limiting bushing during press-fitting, improving assembly accuracy.

[0008] Preferably, one end of the connecting strip is fixedly connected to the middle region of one side of the press-fit break, and the other end of the connecting strip is connected to the middle region of the other side of the press-fit break. This structure ensures a more balanced tension of the connecting strip on both sides of the limiting bushing, further guaranteeing the structural stability of the limiting bushing, avoiding stress concentration caused by improper connection positions during press-fitting or use, and ensuring the symmetry of the limiting bushing during contraction, thus improving the fitting accuracy with the winch drum and mounting port.

[0009] Preferably, the connecting strip and the limiting bushing are manufactured using an integral injection molding process. This process eliminates the need for additional assembly steps, simplifying the production process and reducing manufacturing costs. Simultaneously, the integral molding structure ensures the connection strength between the two, improving product structural reliability, and offers greater material compatibility, reducing connection failures caused by material differences.

[0010] Preferably, the limiting bushing has an annular boss that protrudes radially along its circumference, and one axial end face of the annular boss forms a bushing step surface with the outer peripheral wall of the limiting bushing. The bushing step surface abuts against the end face of the gear bracket located on the mounting port side to achieve axial limiting. The other axial end face of the annular boss is flush with the same-side end face of the limiting bushing and abuts against the end face of the baffle of the winch drum. This structure effectively limits the axial displacement of the limiting bushing, preventing axial movement during operation and ensuring the stability of the circumferential limiting mechanism. Simultaneously, the abutment between the other end face of the annular boss and the end face of the baffle of the winch drum provides axial limiting for the winch drum, while also dispersing the axial force exerted on the limiting bushing by the winch drum during operation, reducing local stress concentration, and extending the service life of the component.

[0011] Preferably, the limiting structure includes a limiting groove and a limiting block that interlock with each other; the limiting groove is radially recessed on the inner peripheral wall of the mounting opening, and the limiting block is radially protruding on the outer peripheral wall of the limiting bushing. This structure is simple to design and easy to manufacture, facilitating precise engagement between the two components to quickly achieve circumferential positioning of the limiting bushing and the gear bracket. Furthermore, the interlocking structure provides high circumferential limiting reliability, effectively transmitting torque and preventing relative rotation.

[0012] Preferably, one axial end face of the limiting block is fitted with the stepped surface of the bushing, and the other axial end face of the limiting block is flush with the same side end face of the limiting bushing. Furthermore, the outer peripheral wall of the limiting block is flush with the outer peripheral wall of the annular boss. This structure integrates the limiting block, the limiting bushing, and the annular boss, ensuring not only the regularity of the limiting bushing's appearance but, more importantly, ensuring uniform force distribution. This prevents interference when the limiting block engages with other components, while also enhancing the load-bearing capacity of the limiting block and improving the stability and durability of circumferential positioning.

[0013] Preferably, a bearing step is formed radially recessed on the inner peripheral wall of the end of the winch drum where it is assembled with the sliding bearing, and the bearing step is coaxially arranged with the sliding bearing; the axial end of the sliding bearing abuts against the bearing step surface of the bearing step to achieve axial limiting. With the above structure, the axial positioning of the sliding bearing can be accurately achieved, preventing axial movement of the sliding bearing during operation, ensuring the fitting accuracy of the sliding bearing with the planetary gear assembly and the winch drum, simplifying the assembly and positioning process of the sliding bearing, improving assembly efficiency, and the bearing step surface can disperse the axial force on the sliding bearing, protecting the assembly end face of the sliding bearing.

[0014] The advantages of this utility model are as follows: First, the press-fit break design of the limiting bushing gives it radial elasticity, allowing for stable assembly without a strict interference fit, reducing the precision requirements and manufacturing costs of the parts, while avoiding deformation and damage during press-fitting, thus extending its service life. Second, the connecting strip at the press-fit break (especially the one-piece injection-molded structure) ensures the integrity of the bushing structure, facilitates storage, transportation, and assembly, and does not affect radial deformation, improving fit accuracy. Third, the snap-fit ​​of the limiting structure and the axial limiting design of the annular boss and bearing step achieve reliable circumferential and axial positioning of each component, eliminating relative displacement and movement during operation, and ensuring synchronous rotation efficiency. In addition, the overall structure simplifies the disassembly and assembly process, reduces maintenance difficulty and the risk of secondary damage, and balances ease of assembly, reliability of use, and economical maintenance. Attached Figure Description

[0015] Figure 1 is a planar sectional view of the circumferential limiting mechanism of the sliding bearing and gear bracket of this utility model.

[0016] Figure 2 is a schematic diagram of the circumferential limiting mechanism of the sliding bearing and gear bracket of this utility model.

[0017] Figure 3 is a three-dimensional sectional view of the circumferential limiting mechanism of the sliding bearing and gear bracket of this utility model.

[0018] Figure 4 is a schematic diagram of the structure of the limiting bushing of this utility model.

[0019] Explanation of reference numerals in the attached figures:

[0020] 1. Gear bracket; 11. Gear mounting cavity; 12. Mounting port; 13. Sealing ring groove; 14. Sealing ring; 2. Sliding bearing; 3. Winch drum; 31. Baffle; 32. Bearing step; 4. Limiting bushing; 40. Limiting structure; 401. Limiting slot; 402. Limiting block; 41. Press-fitting break; 42. Annular boss; 421. Bushing step surface; 5. Connecting strip. Detailed Implementation

[0021] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0022] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0023] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0024] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0025] like Figures 1 to 4 As shown, a sliding bearing and gear support circumferential limiting mechanism includes a gear support 1, a planetary gear assembly, a sliding bearing 2, a winch drum 3, and a limiting bushing 4; a gear mounting cavity 11 is located inside the gear support 1; the planetary gear assembly is installed inside the gear mounting cavity 11; a circular mounting port 12 is provided on the end face of the gear support 1 near the winch drum 3, and the mounting port 12 extends axially ( Figure 1The sliding bearing 2 extends in the left-right direction and communicates with the gear mounting cavity 11; the sliding bearing 2 is connected (meshing) to the central gear on the planetary gear assembly near the hoisting drum 3, and is coaxially arranged at the mounting port 12. The hoisting drum 3 includes a cylinder and baffles 31 symmetrically arranged on the left and right sides of the cylinder. The right end of the cylinder is coaxially sleeved on the sliding bearing 2; a bearing step 32 is formed radially recessed on the inner peripheral wall of the end of the hoisting drum 3 where it is assembled with the sliding bearing 2, and the bearing step 32 is coaxially arranged with the sliding bearing 2; the axial end of the sliding bearing 2 abuts against the bearing step surface of the bearing step 32 to achieve axial limiting. The bearing step 32 can accurately achieve the axial positioning of the sliding bearing 2, avoid axial movement of the sliding bearing 2 during operation, ensure the matching accuracy of the sliding bearing 2 with the planetary gear assembly and the hoisting drum 3, simplify the assembly and positioning process of the sliding bearing 2, improve assembly efficiency, and the bearing step surface can disperse the axial force on the sliding bearing 2, protecting the assembly end face of the sliding bearing 2. The limiting bushing 4 has an open ring structure with a press-fit break 41. The press-fit break 41 gives the limiting bushing 4 a certain degree of elasticity, facilitating quick and accurate press-fitting between the winch drum 3 and the mounting port 12, thus improving assembly convenience. A connecting strip 5 is provided inside the press-fit break 41, with both ends of the connecting strip 5 connected to the two sides of the press-fit break 41. The connecting strip 5 is used to maintain the structural integrity of the limiting bushing 4 and facilitate the press-fitting operation. The connecting strip 5 can maintain the overall structural integrity of the limiting bushing 4, avoiding inconvenience in storage and handling caused by the separation of the limit bushing 4 before press-fitting (preventing the limiting bushing 4 from being squeezed and deformed during storage or handling); it also does not affect the shrinkage deformation of the limiting bushing 4 during press-fitting, ensuring smooth press-fitting operation, and preventing misalignment of the two sides of the limiting bushing 4 during press-fitting, thus improving assembly accuracy. The limiting bushing 4 is coaxially press-fitted between the winch drum 3 and the mounting port 12, and a limiting structure 40 is provided between the limiting bushing 4 and the gear bracket 1, achieving circumferential limiting fit through the limiting structure 40. The outer circumferential wall of the limiting bushing 4 abuts against the inner circumferential wall of the mounting port 12, and the inner circumferential wall of the limiting bushing 4 abuts against the outer circumferential wall of the winch drum 3, thereby achieving synchronous rotation by locking the inner circumferential wall of the winch drum 3 with the outer circumferential wall of the sliding bearing 2. This structure achieves the transmission fit between the winch drum 3 and the sliding bearing 2 through the circumferential limiting fit between the limiting bushing 4 and the gear bracket 1, and the radial pressing action of the limiting bushing 4 on the winch drum 3 and the sliding bearing 2.

[0026] like Figure 4As shown, the left end of the connecting strip 5 is fixedly connected to the middle area of ​​the left cross-section of the press-fitting break 41, and the right end of the connecting strip 5 is connected to the middle area of ​​the right cross-section of the press-fitting break 41. This connection distribution ensures a more balanced tension on both sides of the limiting bushing 4 by the connecting strip 5, further guaranteeing the structural stability of the limiting bushing 4 and preventing stress concentration caused by improper connection positions during press-fitting or use. It also ensures the symmetry of the limiting bushing 4 during contraction, improving the fitting accuracy with the winch drum 3 and the mounting port 12. In this embodiment, the connecting strip 5 and the limiting bushing 4 are manufactured using an integrated injection molding process. Because the connecting strip 5 is relatively thin and fine, it can be bent (flexible) during press-fitting without affecting the dimensions of the limiting bushing 4 after press-fitting. Integrated molding eliminates the need for additional assembly processes, simplifying the production process and reducing manufacturing costs. Simultaneously, the integrated structure ensures the connection strength between the two, improving the reliability of the product structure, and provides stronger material compatibility, reducing connection failures caused by material differences.

[0027] like Figures 1 to 4 As shown, a ring-shaped boss 42 is provided on the limiting bushing 4 in a circumferential and radially protruding manner. A bushing step surface 421 is formed between the axial end face of the ring-shaped boss 42 and the outer peripheral wall of the limiting bushing 4. The bushing step surface 421 abuts against the end face of the gear bracket 1 located on the mounting port 12 side to achieve axial limiting. The other axial end face of the ring-shaped boss 42 is flush with the same-side end face of the limiting bushing 4 and tightly abuts against the end face of the baffle 31 of the winch drum 3. The structure of the limiting bushing 4 effectively restricts its axial displacement, preventing axial movement during operation and ensuring the stability of the circumferential limiting mechanism. Simultaneously, the abutment between the other end face of the ring-shaped boss 42 and the end face of the baffle 31 of the winch drum 3 provides axial limiting for the winch drum 3, while also dispersing the axial force exerted on the limiting bushing 4 during winch drum 3 operation, reducing local stress concentration, and extending the service life of the component.

[0028] like Figure 2 and Figure 3 As shown, in this embodiment, the limiting structure 40 includes a limiting groove 401 and a limiting block 402 that engage with each other. The limiting groove 401 is radially recessed on the inner peripheral wall of the mounting opening 12, and the limiting block 402 is radially protruding on the outer peripheral wall of the limiting bushing 4, with the limiting block 402 located on one circumferential side of the connecting strip 5. The engaging mechanism is simple to design and easy to manufacture, facilitating precise engagement between the two components and enabling rapid circumferential positioning of the limiting bushing 4 and the gear bracket 1. Furthermore, the circumferential limiting reliability of the engaging structure is high, effectively transmitting torque and preventing relative rotation.

[0029] like Figure 4As shown, in this embodiment, the axial side end face (lower end face) of the limiting block 402 is completely fitted with the bushing step surface 421, and the axial side end face (upper end face) of the limiting block 402 is flush with the same side end face of the limiting bushing 4. Furthermore, the outer peripheral wall of the limiting block 402 is flush with the outer peripheral wall of the annular boss 42. This structure integrates the limiting block 402, the limiting bushing 4, and the annular boss 42, ensuring not only the regularity of the limiting bushing 4's appearance but, more importantly, ensuring uniform force distribution. This prevents interference when the limiting block 402 mates with other components, while also enhancing the load-bearing capacity of the limiting block 402 and improving the stability and durability of the circumferential limiting mechanism.

[0030] like Figure 1 As shown, a sealing ring groove 13 with an axial recess is provided on the end face of the gear bracket 1 near the winch drum 3. The sealing ring groove 13 is coaxially arranged with the mounting port 12 and located radially outside the mounting port 12. A sealing ring 14 is provided in the sealing ring groove 13. The two axial ends of the sealing ring 14 abut against the end face of the baffle 31 of the winch drum 3 and the bottom of the sealing ring groove 13, respectively, to form an axial seal. The sealing ring 14 can prevent external dust, impurities, and water from entering the mounting port 12, avoiding contamination of the sliding bearing 2 and the planetary gear assembly, and extending the service life of the transmission components.

[0031] During assembly, first, the sliding bearing 2 is installed into the drum body of the winch 3, with its end face abutting against the bearing step 32. Then, the planetary gear assembly is installed into the gear mounting cavity 11 of the gear bracket 1. Next, the assembled winch 3 and sliding bearing 2 assembly are aligned with the mounting port 12 of the gear bracket 1, connecting the sliding bearing 2 to the output end of the planetary gear assembly. Then, the O-ring seal 14 is placed in the sealing groove 13 machined on the end face of the gear bracket 1. Finally, the limiting block 402 of the limiting bushing 4 is aligned with the limiting groove 401 in the mounting port 12, and the limiting bushing 4 is pressed into the annular gap between the outer wall of the winch 3 and the inner wall of the mounting port 12. During the pressing process, due to the presence of the pressing break 41, the limiting bushing 4 undergoes elastic deformation, thereby reducing the pressing force. When pressed into place, the bushing step surface 421 of the limiting bushing 4 fits tightly against the end face of the mounting port 12, achieving axial limiting of the limiting bushing 4 itself; the limiting block 402 is fully engaged in the limiting slot 401, achieving circumferential fixation between the limiting bushing 4 and the gear bracket 1, preventing relative rotation. At this time, the inner circumferential wall of the limiting bushing 4 presses tightly against the outer circumferential wall of the winch drum 3, transmitting force through the drum body of the winch drum 3, so that its inner wall and the outer wall of the sliding bearing 2 generate sufficient radial pressure to achieve a tight fit, thereby reliably transmitting torque. Finally, after positioning, the baffle 31 is welded to the drum body of the winch drum 3, and the end face of the baffle 31 of the winch drum 3 abuts against the end face of the limiting bushing 4 (flush with the other side of the annular boss 42), restricting the axial movement of the winch drum 3 outward, while the sealing ring 14 is compressed between the end face of the baffle 31 of the winch drum 3 and the bottom of the sealing ring groove 13, forming an effective seal.

[0032] In summary, the advantages of this utility model are:

[0033] Easy assembly and good tolerance: The limiting bushing 4 with press-fit break 41 and connecting band 5 is adopted, which has radial elasticity, reduces the assembly difficulty and the stringent requirements for the machining accuracy of parts, allows for certain dimensional tolerances, and improves assembly efficiency and yield.

[0034] The structure is reliable and the positioning is effective: the radial clamping force of the limiting bushing 4 achieves a tight connection between the winch drum 3 and the sliding bearing 2 to transmit torque. At the same time, the limiting structure 40 (limiting slot 401 and limiting block 402) achieves reliable circumferential positioning with the gear bracket 1, and the annular boss 42 achieves axial positioning. The multi-dimensional positioning ensures the transmission stability.

[0035] Easy to maintain and reusable: The open elastic structure of the limiting bushing 4 makes it easy to remove from the gap during disassembly, avoiding destructive disassembly, facilitating the inspection and replacement of internal parts, reducing maintenance costs and time, and the bushing itself is reusable.

[0036] Process optimization and cost reduction: The limiting bushing 4 can be integrally molded using mature processes such as injection molding, which is simple to manufacture and the cost is controllable; the overall structural design is reasonable, which reduces the need for precision machining and is conducive to mass production.

[0037] In the description of the embodiments of this application, it should be noted that the terms "inner" and "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0038] In the description of this application, the references to terms such as "an embodiment," "some embodiments," "in this embodiment," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0039] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A circumferential limiting mechanism for a sliding bearing and a gear support, comprising a gear support (1), a planetary gear assembly, a sliding bearing (2), a winch drum (3), and a limiting bushing (4), wherein the gear support (1) has a gear mounting cavity (11), the planetary gear assembly is mounted in the gear mounting cavity (11), and a mounting port (12) is provided on the end face of the gear support (1) near the winch drum (3), the mounting port (12) extends axially and communicates with the gear mounting cavity (11), the sliding bearing (2) is drivenly connected to the planetary gear assembly and is coaxially disposed at the mounting port (12), one end of the winch drum (3) is coaxially sleeved on the sliding bearing (2), and the limiting bushing (4) is coaxially pressed between the outer circumferential wall of the winch drum (3) and the inner circumferential wall of the mounting port (12), characterized in that, The limiting bushing (4) has an open ring structure with a press-fit break (41). A connecting strip (5) is provided inside the press-fit break (41), and the two ends of the connecting strip (5) are respectively connected to the two sides of the press-fit break (41). A limiting structure (40) is provided between the outer peripheral wall of the limiting bushing (4) and the inner peripheral wall of the mounting port (12), and circumferential limiting fit is achieved through the limiting structure (40).

2. The circumferential limiting mechanism for the sliding bearing and gear support according to claim 1, characterized in that, One end of the connecting strip (5) is fixedly connected to the middle area of ​​one side of the press-fit break (41), and the other end of the connecting strip (5) is connected to the middle area of ​​the other side of the press-fit break (41).

3. The circumferential limiting mechanism for the sliding bearing and gear support according to claim 1 or 2, characterized in that, The connecting strip (5) and the limiting bushing (4) are made by integral injection molding process.

4. The circumferential limiting mechanism for the sliding bearing and gear support according to claim 1, characterized in that, The limiting bushing (4) has an annular boss (42) that protrudes radially along the circumference. The axial side end face of the annular boss (42) forms a bushing step surface (421) between the outer peripheral wall of the limiting bushing (4). The bushing step surface (421) abuts against the end face of the gear bracket (1) located on the mounting port (12) side to achieve axial limiting. The axial side end face of the annular boss (42) is flush with the end face of the limiting bushing (4) on the same side and abuts against the end face of the baffle (31) of the winch drum (3).

5. The circumferential limiting mechanism for the sliding bearing and gear support according to claim 4, characterized in that, The limiting structure (40) includes a limiting groove (401) and a limiting block (402) that are engaged with each other; the limiting groove (401) is recessed in the radial direction on the inner peripheral wall of the mounting port (12), and the limiting block (402) is protruded in the radial direction on the outer peripheral wall of the limiting bushing (4).

6. The circumferential limiting mechanism for the sliding bearing and gear support according to claim 5, characterized in that, The axial side end face of the limiting block (402) is in contact with the bushing step surface (421), the axial side end face of the limiting block (402) is flush with the same side end face of the limiting bushing (4), and the outer peripheral wall of the limiting block (402) is flush with the outer peripheral wall of the annular boss (42).

7. The circumferential limiting mechanism for the sliding bearing and gear support according to claim 1, characterized in that, A bearing step (32) is formed radially recessed on the inner peripheral wall of the end of the winch drum (3) where it is assembled with the sliding bearing (2), and the bearing step (32) is coaxially arranged with the sliding bearing (2); the axial end of the sliding bearing (2) abuts against the bearing step surface of the bearing step (32) to achieve axial positioning.

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