High-reliability tensioning wheel with fully-sealed dustproof structure

Abstract

The utility model relates to a high-reliability tensioning wheel with a fully-sealed dustproof structure. The tensioning wheel comprises a supporting plate, a supporting sleeve, a central shaft sleeve, a belt pulley, a sliding bearing, a spring, a double-row angular contact ball bearing, a central shaft dustproof cover and an O-shaped rubber sealing ring. A knurling part is arranged at one end of the central shaft sleeve and is matched with the supporting sleeve to form fixed connection, and the supporting plate is connected with the supporting sleeve through the central shaft sleeve to form an integrated structure. According to the structure, the assembly process is simplified in a knurling press-fitting mode, the combination firmness of parts is improved, the problems of looseness, abnormal sound and the like are effectively reduced, and the overall stability of the tensioning wheel structure is guaranteed. The integrated connection of the support plate, the support sleeve and the central shaft sleeve is realized, and the structural stability is improved; front and back dual dustproof design adapts to complex working conditions, and the reliability of the whole machine is improved; and the device is easy and convenient to assemble, high in adaptability and suitable for various medium-high load belt transmission systems.

Description

TECHNICAL FIELD

[0001] The utility model relates to a tensioning wheel technical field especially relates to a high reliability full sealing dustproof structure tensioning wheel. BACKGROUND

[0002] The multi-wedge belt is applied more and more widely in the engine front end wheel system, but the belt drive belongs to friction drive, and with the continuous increase of time, the belt will gradually extend and wear out.In order to ensure that the engine can stably, efficiently and reliably transmit energy to each front end accessory, ensure that the belt tension changes in a relatively stable area, the tensioning device (tensioning wheel) is added in the front end wheel system accessory.The traditional fixed tensioning device cannot automatically compensate due to the extension of the belt, and when the belt tension is insufficient, the accessory belt drive system will have problems such as low transmission efficiency and loud noise, so the automatic tensioning wheel is developed, which ensures that the belt tension changes in a relatively stable area as the belt gradually extends and wears out, and ensures that the engine can stably, efficiently and reliably transmit energy to each front end accessory.But with the development of China's sixth engine, the use condition of the engine is not only improved and optimized, and the traditional dustproof structure tensioning wheel cannot meet the requirements of the sixth engine, so the high reliability, high performance and new type full sealing dustproof structure tensioning wheel is developed. CONTENT OF THE UTILITY MODEL

[0003] The utility model discloses a kind of full sealing dustproof structure tensioning wheels with simple structure, high sealing, strong reliability, easy installation and long service life, to solve the problems of poor sealing performance, complex structure, low reliability and short service life in prior art.

[0004] The utility model is implemented by the following technical scheme: a high reliability full sealing dustproof structure tensioning wheel, characterized by including support plate, support sleeve, center shaft sleeve, belt pulley, sliding bearing, spring, double-row angular contact ball bearing, center shaft dust cover and O-shaped rubber sealing ring.The center shaft sleeve one end is equipped with knurling part, and is formed fixed connection with the support sleeve, and support plate is connected with support sleeve by center shaft sleeve and forms integrated structure.The structure is simplified assembly process by knurling press-fitting mode, improves the combination firmness between parts, effectively reduces the occurrence of problems such as looseness and abnormal sound, and guarantees the overall stability of tensioning wheel structure.

[0005] The sliding bearing is arranged between the support plate and the center shaft sleeve, and is connected with the support plate by interference fit, so that the support plate can rotate relative to the center shaft sleeve.This kind of structure cooperation can significantly improve the coaxiality and stability of the support plate rotation, reduce the running friction resistance, and improve the working efficiency and service life of the tensioning wheel under high-speed working condition.

[0006] The spring is arranged between the support plate and the support sleeve, one end is connected to the limiting block on the support plate, and the other end is connected to the limiting block on the support sleeve, and is used for providing continuous tension. The tension structure formed by the spring can automatically adapt to the stretching and contraction of the belt, maintain stable tension, and improve the operation reliability and power transmission efficiency of the engine front end accessory drive system.

[0007] The pulley is mounted at the outer end of the support plate and is supported by the double-row angular contact ball bearing. This structure can effectively bear axial and radial loads in both directions while ensuring the flexibility of the tension pulley rotation, adapt to stable operation under complex load conditions, and prolong the service life of the bearing.

[0008] An O-shaped rubber sealing ring is arranged between the support plate and the center shaft dust cover, which is attached to the sealing surface between the support plate and the center shaft dust cover to form a fully sealed dustproof structure. Through this structure, impurities such as dust, oil stains, and water vapor can be effectively prevented from entering the internal sliding pair and bearing area, significantly improving the protection level of the tension pulley system while ensuring unrestricted rotation function.

[0009] Further, the O-shaped rubber sealing ring is arranged in the limiting groove on the support plate and is attached to the center shaft dust cover to form a seamless sealing pair for preventing dust and water vapor from entering the internal rotating pair structure area. This structure not only enhances the positioning accuracy of the sealing ring, but also improves the dynamic fitting effect of the overall sealing system, making the tension pulley have higher sealing reliability.

[0010] Further, a wear-reducing dust cover ring is arranged between the inner circular step of the support plate and the outer circular step of the support sleeve, which is made of high wear-resistant material and is attached to the support plate and the support sleeve for reducing rotation friction and closing gaps. Through the design of this ring structure, the specific pressure value between the friction pairs can be significantly reduced, prolonging the service life of the parts, and at the same time, as an auxiliary sealing structure, further preventing foreign matter from entering the working area.

[0011] Further, the spring is limited and fixed by a plastic snap ring and a metal snap ring, the plastic snap ring is installed in the limiting groove arranged on the inner wall of the support plate, and the metal snap ring is used to protect the plastic snap ring from damage and provide structural support. This composite limiting structure not only improves the axial stability of the spring, but also avoids the failure of the plastic snap ring due to long-term work and heat, fatigue, and enhances the durability and reliability of the overall structure.

[0012] Further, the front end of the double-row angular contact ball bearing is provided with a dust cover one, and the rear end is provided with a dust cover two, the dust cover one is metal material and closes the bearing inlet through press fitting, and the dust cover two is a labyrinth type metal structure and is used for blocking the pollutants from entering the bearing interior. The front and rear dustproof structures construct a multi-stage protective barrier through rigid closure and non-contact structure, and the dustproof performance and actual working condition adaptability of the bearing are greatly improved.

[0013] Further, the pulley is installed on the outer end of the support plate through a shaft bolt, one end of the support plate is provided with a stepped structure for positioning the double-row angular contact ball bearing, so that the bearing installation precision and the belt pulley rotation stability are ensured. The structure layout can avoid the belt pulley shaking caused by the bearing assembly error, and improve the rotation balance of the belt pulley and the system transmission efficiency.

[0014] Further, the center shaft sleeve is connected with the support sleeve and the support plate through knurling structure press fitting, and forms an integrated structure connection, so as to improve the coaxiality, structural rigidity and fatigue resistance of the whole tension pulley. The structure improves the overall assembly precision of the machine, and also improves the system impact resistance and vibration resistance, prolongs the service life of the product under high load and high frequency working conditions.

[0015] The high-reliability full-seal dustproof structure tension pulley has the beneficial effects that:

[0016] The high-reliability full-seal dustproof structure tension pulley has the beneficial effects that:

[0017] The integrated connection of the support plate, the support sleeve and the center shaft sleeve improves the structural stability;

[0018] The spring tension automatic adjustment ensures the stable operation of the system, and the maintenance-free property is high;

[0019] The multiple sealing structures ensure the dustproof performance and prolong the service life of the key components;

[0020] The high-wear-resistant material and the double-row angular contact ball bearing are applied, so that the rotation precision and the carrying capacity are effectively improved;

[0021] The front and rear double dustproof design adapts to complex working conditions and improves the reliability of the whole machine;

[0022] The assembly is simple, the adaptability is high, and the high-reliability full-seal dustproof structure tension pulley is suitable for various medium and high load belt transmission systems. DRAWINGS

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 A schematic diagram of a high-reliability, fully sealed, dustproof tensioning wheel;

[0025] In the diagram, 1-support plate, 2-support sleeve, 3-anti-friction dustproof ring, 4-central shaft dust cover, 5-central shaft sleeve, 6-pulley, 7-sliding bearing, 8-O-ring rubber seal, 9-dust cover one, 10-plastic retaining ring, 11-retaining ring, 12-spring, 13-dust cover two, 14-shaft bolt, 15-double row angular contact ball bearing. Detailed Implementation

[0026] 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.

[0027] 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. Example

[0028] like Figure 1 As shown, a high-reliability, fully sealed, dustproof tensioning wheel includes a support plate 1, a support sleeve 2, and a central bushing 5 forming a rigid connection. One end of the central bushing 5 is knurled to form a connection structure with a certain interlocking force. The support sleeve 2, after engaging with the central bushing 5 through this knurled portion, is further fixed to the support plate 1, thus forming an integrated structure that constitutes the basic support frame of the tensioning wheel.

[0029] The spring 12 is arranged between the support plate 1 and the support sleeve 2, one end of the spring 12 is fixed on the spring limiting block arranged on the support plate 1, and the other end of the spring 12 is connected with the limiting block on the support sleeve 2, so that the spring 12 is in a compressed state in the working state, thereby continuously applying a tensioning force to the support plate 1, and the automatic tensioning function of the belt system is realized.

[0030] The support plate 1 is a rotating part of the tensioning wheel, and a sliding bearing 7 is arranged between the support plate 1 and the opposite central shaft sleeve 5. The sliding bearing 7 is installed in the support plate 1 by interference press-fitting, so that the support plate 1 is tightly combined with the outer ring of the sliding bearing 7, thereby ensuring that the entire tensioning wheel can rotate stably around the central shaft sleeve 5. Embodiment

[0031] This embodiment is further optimized on the basis of embodiment one, and specifically:

[0032] In order to further improve the dustproof sealing performance, an O-shaped rubber sealing ring 8 is arranged between the support plate 1 and the central shaft dustproof cover 4. The sealing ring is embedded in the limiting groove preformed on the support plate 1, and is in close contact with the central shaft dustproof cover 4 to form a sealing pair. The O-shaped rubber sealing ring 8 has excellent elasticity and compression resilience, and can maintain a close contact state during rotation to prevent external dust and water vapor from entering the internal sliding pair and bearing area, thereby building a completely sealed dustproof space.

[0033] The central shaft dustproof cover 4 is fixed with the central shaft sleeve 5 through a threaded or buckle structure, and a seamless dynamic sealing surface is formed between the outer edge of the central shaft dustproof cover 4 and the rotating part of the support plate 1. Embodiment

[0034] This embodiment is further optimized on the basis of embodiment one, and specifically:

[0035] A wear-reducing dustproof sleeve ring 3 is arranged between the inner circular step of the support plate 1 and the outer circular step of the support sleeve 2. The sleeve ring 3 is made of a high-wear-resistant material (such as PTFE composite material) with self-lubricating performance, and the mating surfaces of the adjacent parts are processed with high precision, so that the sleeve ring 3 can maintain a gapless close contact state during rotation, thereby realizing the dual effects of reducing rotation friction and prolonging the service life of the parts, and further sealing the gap and strengthening the dustproof effect.

[0036] By enlarging the contact area between the sleeve ring 3 and the support plate 1 and the support sleeve 2, the specific pressure value is effectively reduced, and the wear resistance is improved. Embodiment

[0037] This embodiment is further optimized on the basis of embodiment one, and specifically:

[0038] In order to improve the stability of the spring 12 installation, a limiting groove is arranged in the inner wall of the support plate 1, and the plastic snap ring 10 and the metal snap ring 11 are embedded in the groove. The plastic snap ring 10 plays a role in positioning the end of the spring 12, and through the soft and hard matching, the wear caused by high-frequency vibration is relieved; the metal snap ring 11 serves as a protective piece of the plastic snap ring, and is tightly combined with the limiting groove to prevent the spring from loosening or axial displacement.

[0039] The composite snap ring structure effectively improves the guiding accuracy of the spring 12 and the overall reliability of the system. Embodiment

[0040] This embodiment is further optimized on the basis of embodiment one, specifically:

[0041] The output end of the tensioning wheel is provided with a belt pulley 6, which is installed on the outer end of the support plate 1 through a shaft bolt 14 and is supported through a double-row angular contact ball bearing 15. Compared with the two single-row deep groove ball bearings commonly used in the traditional structure, the double-row angular contact ball bearing 15 can simultaneously bear axial and radial loads, has a compact structure and high rigidity, and can effectively ensure the running stability of the belt pulley 6 under high-speed rotation.

[0042] One end of the support plate 1 is provided with a stepped positioning structure, so that the bearing 15 can be accurately installed without axial displacement, and the long-term stable operation of the belt pulley 6 is ensured. Embodiment

[0043] This embodiment is further optimized on the basis of embodiment one, specifically:

[0044] In order to further improve the running life of the bearing system, a dust cover one 9 is arranged at the front end of the double-row angular contact ball bearing 15, which is made of metal material and realizes complete sealing by press-fitting sealing; a dust cover two 13 is arranged at the rear end, which adopts a labyrinth structure design and is composed of multiple coaxially nested metal rings, and the gap path blocks the external pollutants from entering the bearing cavity.

[0045] The front and rear combined dust cover structure realizes effective dust prevention without contacting the rotating part, which is one of the important designs of the utility model for realizing long life and high stability. Embodiment

[0046] This embodiment is further optimized on the basis of embodiment one, specifically:

[0047] In order to simplify the assembly process and improve the overall structural rigidity of the tensioning wheel, the center shaft sleeve 5 is connected to the support sleeve 2 and the support plate 1 by knurling connection in the design, avoiding the problem of loose thread connection between traditional multiple components. At the same time, the structure reduces the assembly tolerance superposition, improves the relative coaxiality between each rotating part, and fundamentally improves the running stability and fatigue resistance of the whole machine.

[0048] In the above embodiments, the basic principles and main features of the utility model and the advantages of the utility model are described. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the utility model. Without departing from the spirit and scope of the utility model, the changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the utility model, and should be within the protection scope of the claims attached to the utility model.

Claims

1. A high-reliability, fully sealed, dustproof tensioning wheel, characterized in that, The system includes a support plate (1), a support sleeve (2), a central shaft sleeve (5), a pulley (6), a sliding bearing (7), a spring (12), a double-row angular contact ball bearing (15), a central shaft dust cover (4), and an O-ring rubber seal (8). One end of the central shaft sleeve (5) has a knurled portion, which cooperates with the support sleeve (2) to form a fixed connection. The support plate (1) is connected to the support sleeve (2) via the central shaft sleeve (5) to form an integral structure. The sliding bearing (7) is located between the support plate (1) and the central shaft sleeve (5), and is connected to the support plate (1) with an interference fit, so that the support plate (1)... The spring (12) is located between the support plate (1) and the support sleeve (2), with one end connected to the limiting block on the support plate (1) and the other end connected to the limiting block on the support sleeve (2), for providing continuous tension; the pulley (6) is installed on the outer end of the support plate (1) and supported by the double-row angular contact ball bearing (15); an O-ring rubber seal (8) is provided between the support plate (1) and the central shaft dust cover (4), which fits against the sealing surface between the support plate (1) and the central shaft dust cover (4) to form a fully sealed dustproof structure.

2. The high-reliability, fully sealed, dustproof tensioning wheel according to claim 1, characterized in that, The O-ring rubber seal (8) is set in the limiting groove on the support plate (1) and fits with the dust cover (4) of the central shaft to form a seamless sealing pair, which is used to prevent dust and water vapor from entering the internal rotating pair structure area.

3. The high-reliability, fully sealed, dustproof tensioning wheel according to claim 1, characterized in that, A friction-reducing and dustproof sleeve (3) is provided between the inner circular step of the support plate (1) and the outer circular step of the support sleeve (2). The friction-reducing and dustproof sleeve (3) is made of high wear-resistant material and fits snugly with the support plate (1) and the support sleeve (2) to reduce rotational friction and seal gaps.

4. The high-reliability, fully sealed, dustproof tensioning wheel according to claim 1, characterized in that, The spring (12) is fixed by a plastic retaining ring (10) and a metal retaining ring (11). The plastic retaining ring (10) is installed in a limiting groove provided on the inner wall of the support plate (1). The metal retaining ring (11) is used to protect the plastic retaining ring (10) from damage and provide structural support.

5. The high-reliability, fully sealed, dustproof tensioning wheel according to claim 1, characterized in that, The front end of the double-row angular contact ball bearing (15) is provided with a dust cover one (9) and the rear end is provided with a dust cover two (13). The dust cover one (9) is made of metal and seals the bearing inlet by press fitting. The dust cover two (13) is a labyrinth metal structure used to prevent contaminants from entering the bearing.

6. The high-reliability, fully sealed, dustproof tensioning wheel according to claim 5, characterized in that, The pulley (6) is mounted on the outer end of the support plate (1) by a shaft bolt (14). One end of the support plate (1) is provided with a stepped structure for positioning the double row angular contact ball bearing (15) to ensure the installation accuracy of the double row angular contact ball bearing (15) and the rotational stability of the pulley (6).

7. The high-reliability, fully sealed, dustproof tensioning wheel according to claim 1, characterized in that, The central bushing (5) is connected to the support sleeve (2) and the support plate (1) by knurling structure press fitting, forming an integrated structural connection, which is used to improve the overall coaxiality, structural rigidity and fatigue resistance of the tension wheel.

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