Automatic tensioning wheel structure

Abstract

The utility model discloses an automatic tensioning wheel structure in the field of mechanical transmission parts, which comprises a shell, a support shaft is arranged in the shell, the top of the shell is positioned above the support shaft and is connected with a support plate through a key, an annular support boss is integrally formed on the periphery of the support shaft in the shell, and the support plate is connected with the support plate through a key. A spring is arranged between the periphery of the annular supporting boss on the shell and the supporting plate. During working, when the support plate swings, the spring is driven to expand, the damping piece is pressed to be in friction with the shell, the swing frequency of the support plate is reduced by increasing friction force and damping, and therefore the service life of a product is prolonged; meanwhile, the double-row angular contact ball bearing is adopted to improve the bearing capacity, the dustproof performance is enhanced through the sealing design, the service life of the product is further prolonged, the stability, reliability and environmental adaptability of the automatic tensioning wheel are remarkably improved through damping adjustment, double dust prevention and the long-service-life bearing design, all indexes are superior to those of a traditional tensioning wheel device, and the service life is prolonged. The device is suitable for heavy trucks and other harsh working conditions.

Description

Technical Field

[0001] This utility model relates to the field of mechanical transmission components, specifically an automatic tensioning wheel structure. Background Technology

[0002] In truck engine drive systems, drive belts (or chains) can become loose over time, leading to decreased transmission efficiency, increased noise, and even accelerated wear of components. Existing tensioner devices mostly use manual adjustment, requiring periodic shutdowns for adjustment, which is cumbersome and cannot adapt to changes in belt looseness in real time. While some automatic tensioners have automatic adjustment functions, they suffer from the following drawbacks:

[0003] 1) Insufficient damping control: The high oscillation frequency during adjustment can easily lead to large fluctuations in tension, affecting transmission stability;

[0004] 2) Poor dustproof performance: Dust can easily enter the internal structure, accelerating the wear of bearings and friction parts and shortening their service life;

[0005] 3) Limited bearing life: Traditional single-row bearings have insufficient load-bearing capacity and cannot meet the high-load operating requirements of heavy trucks.

[0006] Therefore, those skilled in the art have provided an automatic tensioning wheel structure to solve the problems mentioned in the background art. Utility Model Content

[0007] The purpose of this invention is to provide an automatic tensioning wheel structure to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] An automatic tensioning wheel structure includes a housing, a support shaft inside the housing, a support plate connected to the top of the housing above the support shaft via a key, an annular support boss integrally formed inside the housing around the support shaft, a spring disposed between the annular support boss and the support plate, an arc-shaped elastic steel sheet disposed inside the housing around the spring, a damping element disposed around the arc-shaped elastic steel sheet, the damping element being movably disposed between the arc-shaped elastic steel sheet and the spring, the two ends of the spring being fixedly connected to the housing and the support plate respectively, a tensioning wheel body being rotatably disposed on the support plate, and the arc-shaped elastic steel sheet being engaged inside the damping element and in close proximity to the spring.

[0010] As a further embodiment of this utility model: an oil groove is provided on one side above the support plate, and a bearing mounting bracket is integrally formed at the center of the oil groove on the support plate. A double-row angular contact ball bearing is installed around the bearing mounting bracket between the tensioning wheel body and the bearing mounting bracket. A rotating pin is threadedly connected to the center of the bearing mounting bracket. The rotating pin is located at the center hole of the double-row angular contact ball bearing. A dust cover is fixedly connected to the tensioning wheel body at the end of the rotating pin.

[0011] As a further embodiment of this utility model: an installation hole is integrally formed on one side wall of the housing, a limiting groove is formed on one side of the installation hole on the housing, a limiting boss is integrally formed on one side wall of the support plate, an insertion hole is formed on the limiting boss, and a limiting pin is inserted into the insertion hole to cooperate with the limiting groove to provide rotational limitation for the support plate.

[0012] As a further embodiment of this utility model, the damping component is made of phenolic resin.

[0013] As a further embodiment of this utility model: a double-lip seal ring is provided at the junction of the housing and the support plate, and rubber seal rings are provided at both ends of the double-row angular contact ball bearing. By adopting a double-row angular contact ball bearing, the rated dynamic load of a single bearing is increased, and it can withstand radial load and bidirectional axial load, thus improving the service life compared to traditional single-row bearings.

[0014] As a further embodiment of this utility model: the double-row angular contact ball bearing is model 5203 (3203) with a rated dynamic load ≥ 9.05kN.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. When the transmission belt is loose, the belt tension decreases, the support plate swings counterclockwise under the action of the spring, and the tensioning wheel presses against the belt, increasing the belt tension; conversely, when the belt is too tight, the support plate swings clockwise, the spring compression increases, and the friction between the damping component and the housing is pushed by the arc-shaped elastic steel sheet to consume energy and suppress excessive fluctuations in tension.

[0017] 2. During the swing of the support plate in this utility model, the frictional resistance between the damping component and the shell is converted into heat energy, reducing the swing amplitude and frequency of the support plate and ensuring the smooth operation of the transmission system. Through damping adjustment, double dustproof and high-life bearing design, the stability, reliability and environmental adaptability of the automatic tensioning wheel are significantly improved. All indicators are better than traditional tensioning wheel devices and are suitable for harsh working conditions such as heavy trucks. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is an exploded view of the present invention;

[0020] Figure 3 This is a structural diagram of the support plate in this utility model.

[0021] In the diagram: 1. Mounting shaft; 2. Support shaft; 3. Housing; 301. Limiting groove; 302. Mounting hole; 303. Annular support boss; 4. Spring; 5. Damping component; 6. Arc-shaped elastic steel sheet; 7. Support plate; 701. Limiting boss; 702. Insertion hole; 703. Oil groove; 704. Bearing mounting bracket; 8. Double row angular contact ball bearing; 9. Tensioner wheel body; 10. Rotating pin; 11. Dustproof cover; 12. Limiting pin. Detailed Implementation

[0022] Please see Figures 1-3 In this embodiment of the present invention, an automatic tensioning wheel structure includes a housing 3, a support shaft 2 is provided inside the housing 3, a support plate 7 is connected to the top of the housing 3 above the support shaft 2 by a key, an annular support boss 303 is integrally formed inside the housing 3 around the support shaft 2, a spring 4 is provided between the annular support boss 303 and the support plate 7, an arc-shaped elastic steel sheet 6 is provided inside the housing 3 around the spring 4, a damping element 5 is provided around the arc-shaped elastic steel sheet 6, the damping element 5 is movably disposed between the arc-shaped elastic steel sheet 6 and the spring 4, the two ends of the spring 4 are fixedly connected to the housing 3 and the support plate 7 respectively, and a tensioning wheel body 9 is rotatably disposed on the support plate 7.

[0023] By adopting the above technical solution, when the transmission belt is loose, the belt tension decreases, the support plate 7 swings counterclockwise under the action of the spring 4, and the tension wheel body 9 presses against the belt, increasing the belt tension; conversely, when the belt is too tight, the support plate 7 swings clockwise, the spring 4 compression increases, and the energy is consumed by the friction between the damping element 5 and the housing 3 through the arc-shaped elastic steel sheet 6, suppressing excessive fluctuations in tension force.

[0024] Among them, an oil groove 703 is provided on one side above the support plate 7. A bearing mounting bracket 704 is integrally formed on the support plate 7 at the center of the oil groove 703. A double row angular contact ball bearing 8 is installed around the bearing mounting bracket 704 between the tension wheel body 9 and the bearing mounting bracket 704. A rotating pin 10 is threadedly connected to the middle of the bearing mounting bracket 704. The rotating pin 10 is located at the center hole of the double row angular contact ball bearing 8. A dust cover 11 is fixedly connected to the end of the rotating pin 10 on the tension wheel body 9, which can greatly improve the sealing performance of the tension wheel.

[0025] Among them, a mounting hole 302 is integrally formed on one side wall of the housing 3, and a limiting groove 301 is formed on one side of the mounting hole 302 on the housing 3. A limiting boss 701 is integrally formed on one side wall of the support plate 7, and an insertion hole 702 is provided on the limiting boss 701. A limiting pin 12 that cooperates with the limiting groove 301 to provide a rotation limit for the support plate 7 is inserted into the insertion hole 702. The limiting pin 12 can be used to...

[0026] Among them, the damping component 5 is made of phenolic resin.

[0027] The housing 3 and the support plate 7 are provided with a double-lip seal, and the double-row angular contact ball bearing 8 is provided with rubber seals at both ends, which can effectively prevent external dust from entering the housing 3.

[0028] Among them, the double-row angular contact ball bearing model 8 is 5203 (3203), with a rated dynamic load ≥ 9.05kN.

[0029] The automatic tensioning wheel structure is applied to the truck wheel system. When the support plate 7 swings, it drives the spring 4 to expand, which compresses the damping component 5 and rubs against the housing 3. By increasing the friction and damping, the swing frequency of the support plate 7 is reduced, thereby increasing the product's service life. At the same time, the use of double-row angular contact ball bearings 8 improves the load-bearing capacity, and the sealing design enhances the dustproof performance, further extending the product's life.

[0030] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An automatic tensioning wheel structure, comprising a housing (3), characterized in that: The housing (3) is provided with a support shaft (2) inside. The top of the housing (3) is connected to the support plate (7) by a key above the support shaft (2). The housing (3) is provided with an annular support boss (303) integrally formed around the support shaft (2) inside. A spring (4) is provided between the annular support boss (303) and the support plate (7) on the housing (3). An arc-shaped elastic steel sheet (6) is provided around the spring (4) inside the housing (3). A damping element (5) is provided around the arc-shaped elastic steel sheet (6). The damping element (5) is movably disposed between the arc-shaped elastic steel sheet (6) and the spring (4). The two ends of the spring (4) are fixedly connected to the housing (3) and the support plate (7) respectively. A tensioning wheel body (9) is rotatably disposed on the support plate (7). The arc-shaped elastic steel sheet (6) is stuck inside the damping element (5) and close to the spring (4).

2. The automatic tensioning wheel structure according to claim 1, characterized in that: An oil groove (703) is provided on one side above the support plate (7). A bearing mounting bracket (704) is integrally formed on the support plate (7) at the center of the oil groove (703). A double-row angular contact ball bearing (8) is installed on the periphery of the bearing mounting bracket (704) between the tension wheel body (9) and the bearing mounting bracket (704). A rotating pin (10) is threadedly connected to the middle of the bearing mounting bracket (704). The rotating pin (10) is located at the center hole of the double-row angular contact ball bearing (8). A dust cover (11) is fixedly connected to the end of the rotating pin (10) on the tension wheel body (9).

3. The automatic tensioning wheel structure according to claim 1, characterized in that: The housing (3) has an integrally formed mounting hole (302) on one side wall. A limiting slot (301) is formed on the housing (3) on one side of the mounting hole (302). A limiting boss (701) is integrally formed on one side wall of the support plate (7). An insertion hole (702) is formed on the limiting boss (701). A limiting pin (12) that cooperates with the limiting slot (301) to limit the rotation of the support plate (7) is inserted into the insertion hole (702).

4. The automatic tensioning wheel structure according to claim 2, characterized in that: A double-lip seal is provided at the junction of the housing (3) and the support plate (7), and rubber seals are provided at both ends of the double-row angular contact ball bearing (8).

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