Automatic tensioning wheel

Abstract

The application discloses an automatic tensioning wheel, which comprises a tensioning wheel body, a supporting arm and a belt pulley, a first cavity is arranged between the supporting arm and the outer wall of the body, the tensioning wheel comprises an intermediate shaft connecting the body and the supporting arm, a second cavity is arranged between the supporting arm and the intermediate shaft, the belt pulley is provided with a groove into which the supporting arm extends, a third cavity is arranged between the outer side wall of the supporting arm and the inner side wall of the groove, the tensioning wheel further comprises a first sealing element arranged in the first cavity, a second sealing element arranged in the second cavity and a third sealing element arranged in the third cavity, so that the first cavity, the second cavity and the third cavity are sealed. The sealing elements are arranged respectively to seal the first cavity, the second cavity and the third cavity, so that damage to the inside of the automatic tensioning wheel, the intermediate shaft and the bearing caused by impurities such as external dust and water stains entering the first cavity, the second cavity and the third cavity is avoided, the inside of the automatic tensioning wheel is protected from being clean, and the use stability of the components is ensured.

Description

Technical Field

[0001] This application belongs to the technical field of engine parts, specifically relating to an automatic tensioner. Background Technology

[0002] A common type of tensioning pulley in the prior art includes a tensioning pulley body, a support arm, and a pulley. The support arm is connected to both the tensioning pulley body and the pulley. To ensure that the pulley's rotation is unrestricted, a certain gap is usually maintained between the support arm and the pulley when they are connected. External impurities entering this gap can easily damage the bearing. Similarly, the support arm and the tensioning pulley body will move relative to each other during use, maintaining a certain gap as well. However, the existence of this gap makes the tensioning pulley body susceptible to external contamination, resulting in insufficient waterproof and dustproof capabilities. This allows external impurities such as dust and water to enter the tensioning pulley, causing it to malfunction and affecting normal use. Utility Model Content

[0003] This application provides an automatic tensioning wheel that solves the problem that external impurities can easily enter through the installation gap of the tensioning wheel, affecting its normal use.

[0004] The technical solution adopted in this application is as follows:

[0005] An automatic tensioning wheel includes a tensioning wheel body, a support arm, and a pulley. The two ends of the support arm are respectively connected to the body and the pulley. A first cavity is provided between the support arm and the outer wall of the body. The tensioning wheel includes an intermediate shaft connecting the body and the support arm. A second cavity is provided between the support arm and the intermediate shaft. The pulley has a groove into which the support arm extends. A third cavity is provided between the outer wall of the support arm and the inner wall of the groove. The tensioning wheel also includes a first sealing element located in the first cavity, a second sealing element located in the second cavity, and a third sealing element located in the third cavity, to seal the first cavity, the second cavity, and the third cavity.

[0006] Preferably, at least one of the body and the support arm is provided with a mounting groove, the opening of the mounting groove faces the first cavity, and the first seal is located in the mounting groove.

[0007] Preferably, there are two mounting grooves along the assembly direction of the body and the support arm, and the first sealing element includes two first sealing rings respectively disposed in the two mounting grooves.

[0008] Preferably, both mounting slots are located on the body, and the first sealing ring is bonded to the body.

[0009] Preferably, a dust cover is provided between the intermediate shaft and the support arm, and the dust cover and the support arm form the second cavity. The second sealing element includes a second sealing ring disposed in the second cavity.

[0010] Preferably, there are two second sealing rings, and both second sealing rings are adhered to the dust cover.

[0011] Preferably, at least one of the support arm and the pulley is provided with a snap-fit ​​groove, and the third seal includes a third sealing ring disposed in the snap-fit ​​groove.

[0012] Preferably, the support arm and the inner wall and bottom wall of the groove are provided with clearance gaps to form the third cavity, and two third sealing rings are provided, with the two third sealing rings respectively located on both sides of the support arm.

[0013] Preferably, both the support arm and the pulley are provided with the snap-fit ​​groove, and the two snap-fit ​​grooves are axially offset.

[0014] Preferably, the two third sealing rings are respectively bonded to the inner wall of the corresponding snap-fit ​​groove.

[0015] Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows:

[0016] (1) In this application, the tensioning wheel and the pulley are connected by a support arm. A first cavity is provided to prevent relative rotation between the support arm and the pulley from causing contact wear. A second cavity is provided between the support arm and the intermediate shaft to prevent contact wear between the intermediate shaft and the support arm, and to facilitate smooth rotation of the intermediate shaft. A third cavity is provided between the support arm and the pulley to prevent excessive contact wear between the pulley and the support arm when the pulley rotates. At the same time, this solution provides seals in the first, second, and third cavities to seal them. This not only prevents contact wear between the support arm and the body and the pulley, but also seals the gaps between them. This prevents external dust, water stains, and other impurities from entering the first, second, and third cavities and causing damage to the interior of the automatic tensioning wheel, the intermediate shaft, and the bearings. This helps to keep the interior of the automatic tensioning wheel clean and ensures the stability of each component.

[0017] (2) By setting two mounting slots and correspondingly setting two first sealing rings, the first sealing rings achieve circumferential sealing of the first cavity within the mounting slots, preventing dust and water from entering the tension wheel body. The two mounting slots and corresponding first sealing rings enhance the sealing effect of the first cavity and prevent poor sealing due to the failure of one sealing ring, thus ensuring the sealing stability of the first cavity. Furthermore, the double sealing provides double protection against external impurities, further improving sealing reliability and ensuring the cleanliness and dryness of the tension wheel body's interior.

[0018] Both mounting slots are located on the main body. The first sealing ring is bonded to the main body before assembly with the support arm. During the assembly process between the support arm and the main body, the first sealing ring is compressed, directly creating a seal in the first cavity. Simultaneously, the bonding of the first sealing ring to the mounting slot on the main body helps ensure its stability and firmness, achieving a good sealing effect.

[0019] (3) By setting two second sealing rings, a double seal is achieved for the second cavity, preventing the second cavity from losing its sealing effect due to the failure of one sealing ring. At the same time, it can block external impurities to a greater extent, keeping the intermediate shaft clean and dry. The two second sealing rings are bonded to the dust cover, directly forming the second cavity and simultaneously sealing it when the support arm is assembled with the body. The bonding of the second sealing rings helps to ensure the positional stability of the second sealing rings in the second cavity, achieving effective sealing.

[0020] (4) By setting a snap-fit ​​groove on the support arm and / or pulley to snap and limit the third sealing ring, the third sealing ring forms a circumferential seal on the third cavity, forming a reinforced seal at the pulley, protecting the internal bearing, preventing external impurities from entering the interior through the third cavity and causing wear on the bearing, which is beneficial to improving the service life of the bearing.

[0021] By bonding and fixing the two third sealing rings together, the position of the third sealing rings is further fixed while the snap-fit ​​is limited, so as to avoid the third sealing rings from being misaligned, which would cause damage to the rings or poor sealing effect. This ensures that the rings are firmly set in the snap-fit ​​groove, achieving a good sealing effect. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0023] Figure 1 This is a schematic diagram of the structure of the automatic tensioning wheel in one embodiment of the present invention;

[0024] Figure 2 This is a cross-sectional view of the automatic tensioning wheel in one embodiment of the present invention;

[0025] Figure 3 for Figure 2 Enlarged view of part A;

[0026] Figure 4 for Figure 2 Enlarged view of part B;

[0027] Figure 5 for Figure 2 Enlarged view of part C.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1-Body, 101-Mounting groove, 2-Support arm, 3-Pulley, 31-Groove, 4-First cavity, 5-Second cavity, 6-Third cavity, 7-Intermediate shaft, 8-Dust cover, 9-Snap-fit ​​groove, 10-First sealing ring, 11-Second sealing ring, 12-Third sealing ring. Detailed Implementation

[0030] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0031] Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below. It should be noted that, unless otherwise specified, the embodiments of this application and the features thereof can be combined with each other.

[0032] Furthermore, it should be understood in the description of this application that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0033] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0034] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is 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 can be combined in any suitable manner in one or more embodiments or examples.

[0035] This application provides an automatic tensioning wheel, such as Figures 1 to 5 As shown, the device includes a tensioning wheel body 1, a support arm 2, and a pulley 3. The two ends of the support arm 2 are respectively connected to the tensioning wheel body 1 and the pulley 3. A first cavity 4 is provided between the support arm 2 and the outer wall of the body 1. The tensioning wheel includes an intermediate shaft 7 connecting the body 1 and the support arm 2. A second cavity 5 is provided between the support arm 2 and the intermediate shaft 7. The pulley 3 is provided with a groove 31 into which the support arm 2 extends. A third cavity 6 is provided between the outer wall of the support arm 2 and the inner wall of the groove 31. The tensioning wheel also includes a first sealing element located in the first cavity 4, a second sealing element located in the second cavity 5, and a third sealing element located in the third cavity 6, so as to seal the first cavity 4, the second cavity 5, and the third cavity 6.

[0036] In this application, the tensioning wheel and the pulley 3 are connected by the support arm 2. A first cavity 4 is provided to prevent relative rotation between the support arm 2 and the pulley 3, thus avoiding contact wear. A second cavity 5 is provided between the support arm 2 and the intermediate shaft 7 to prevent contact wear between the intermediate shaft 7 and the support arm 2, and to facilitate smooth rotation of the intermediate shaft 7. A third cavity 6 is provided between the support arm 2 and the pulley 3 to prevent excessive contact wear between the pulley 3 and the support arm 2 during rotation. Simultaneously, this solution provides seals in the first cavity 4, the second cavity 5, and the third cavity 6 to seal these cavities. This prevents contact wear between the support arm 2 and the body 1 and the pulley 3, and seals the gaps between them. This prevents external dust, water stains, and other impurities from entering the first cavity 4, the second cavity 5, and the third cavity 6 and damaging the interior of the automatic tensioning wheel, the intermediate shaft 7, and the bearings. This helps maintain the cleanliness of the automatic tensioning wheel's interior and ensures the stability of all components.

[0037] In one embodiment, such as Figure 2 , Figure 3As shown, at least one of the body 1 and the support arm 2 is provided with a mounting groove 101, the opening of the mounting groove 101 faces the first cavity 4, and the first seal is located inside the mounting groove 101.

[0038] By setting mounting grooves 101 on the main body 1 or the support arm 2, or both simultaneously, the first sealing element is placed in the mounting groove 101 to limit the first sealing element. The groove opening of the mounting groove 101 faces the first cavity 4, so the first sealing element is limited in the first cavity 4 by the mounting groove 101 and seals the first cavity 4.

[0039] Preferably, there are two mounting grooves 101 along the assembly direction of the body 1 and the support arm 2, and the first sealing element includes two first sealing rings 10 respectively disposed in the two mounting grooves 101.

[0040] Two mounting slots 101 are provided, along with two corresponding first sealing rings 10. The first sealing rings 10 provide a circumferential seal to the first cavity 4 within the mounting slots 101, preventing dust and water from entering the tension wheel body 1. The two mounting slots 101 and the corresponding two first sealing rings 10 enhance the sealing effect of the first cavity 4 and prevent poor sealing due to the failure of a single sealing ring, thus ensuring the sealing stability of the first cavity 4. Furthermore, the double seal provides double protection against external impurities, further improving sealing reliability and ensuring the cleanliness and dryness of the tension wheel body's interior.

[0041] Furthermore, both mounting slots 101 are located on the body 1, and the first sealing ring 10 is bonded to the body 1.

[0042] Both mounting slots 101 are set in the body 1. The first sealing ring 10 is first bonded to the body 1, and then assembled with the support arm 2. During the assembly process between the support arm 2 and the body 1, the first sealing ring 10 is compressed, directly forming a sealing effect at the first cavity 4. At the same time, the first sealing ring 10 is bonded to the mounting slot 101 of the body 1, which helps to ensure the stability and firmness of the first sealing ring 10 and achieve its good sealing effect.

[0043] In one embodiment, such as Figure 2 , Figure 4 As shown, a dust cover 8 is provided between the intermediate shaft 7 and the support arm 2, and a second cavity 5 is formed between the dust cover 8 and the support arm 2. The second sealing element includes a second sealing ring 11 disposed in the second cavity 5.

[0044] By setting a second sealing ring 11 in the second cavity 5, the second cavity 5 is sealed, preventing dust and water and other impurities from entering the intermediate shaft 7 through the second cavity 5 and causing wear and rust on the intermediate shaft 7, thereby improving the reliability of the intermediate shaft 7.

[0045] Preferably, there are two second sealing rings 11, and both second sealing rings 11 are adhered to the dust cover 8.

[0046] Two second sealing rings 11 are provided to achieve a double seal for the second cavity 5, preventing the second cavity 5 from losing its sealing effect due to the failure of one sealing ring. Simultaneously, they can better block external impurities, keeping the intermediate shaft 7 clean and dry. The two second sealing rings 11 are bonded to the dust cover 8, directly forming the second cavity 5 and simultaneously sealing it during the assembly of the support arm 2 and the body 1. Bonding the second sealing rings 11 also helps ensure the positional stability of the second sealing rings 11 in the second cavity 5, achieving effective sealing.

[0047] In one embodiment, such as Figure 2 , Figure 5 As shown, at least one of the support arm 2 and the pulley 3 is provided with a snap-fit ​​groove 9, and the third seal includes a third sealing ring 12 disposed in the snap-fit ​​groove 9.

[0048] By setting a snap-fit ​​groove 9 on the support arm 2 and / or pulley 3 to snap and limit the third sealing ring 12, the third sealing ring 12 forms a circumferential seal on the third cavity 6, forming a reinforced seal at the pulley 3, protecting the internal bearing, preventing external impurities from entering the interior through the third cavity 6 and causing wear on the bearing, and helping to improve the service life of the bearing.

[0049] Preferably, the support arm 2 and the inner and bottom walls of the groove 31 are provided with clearance gaps to form a third cavity 6. Two third sealing rings 12 are provided, and the two third sealing rings 12 are respectively provided on both sides of the support arm 2. When the support arm 2 is connected to the pulley 3, a gap is left on both sides to minimize the wear between the pulley 3 and the support arm 2 during rotation. Therefore, providing two sealing rings is beneficial to sealing both the inner and outer sides of the support arm 2 at the groove 31, effectively preventing the entry of external impurities.

[0050] Preferably, both the support arm 2 and the pulley 3 are provided with locking grooves 9, and the two locking grooves 9 are axially offset.

[0051] A snap-fit ​​groove 9 is provided on the support arm 2 and the pulley 3 respectively. The axial misalignment of the snap-fit ​​groove 9 refers to the axial misalignment of the relative positions of the two snap-fit ​​grooves 9 after the support arm 2 is connected to the pulley 3. This method is beneficial to properly seal the space between the two side walls of the groove 31 during installation, and avoids excessive compression between the two third sealing rings 12 and the support arm 2 and the inner wall of the groove 31.

[0052] Preferably, the two third sealing rings 12 are respectively bonded to the inner wall of the corresponding snap-fit ​​groove 9.

[0053] By bonding and fixing the two third sealing rings 12 together, the position of the third sealing rings 12 is further fixed while limiting the snap-fit, so as to avoid the third sealing rings 12 from being misaligned and thus damaged or resulting in poor sealing effect. This ensures that they are firmly set in the snap-fit ​​groove 9, achieving a good sealing effect.

[0054] Furthermore, it should be noted that the first, second, and third seals in this application are all located at the openings that directly connect the cavity formed during installation to the outside. Since the support arm 2 forms a labyrinth structure when connected to the pulley 3 or the body 1 in the prior art, if the sealing position is located inside the labyrinth structure, impurities will easily enter and accumulate inside, which will damage the seals and make it inconvenient to replace them. This application can directly seal at the external interface to prevent impurities from entering and accumulating inside, thereby facilitating the sealing protection of the interior.

[0055] In one embodiment, the first sealing ring 10, the second sealing ring 11, and the third sealing ring 12 can all be lip-type sealing rings.

[0056] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0057] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0058] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. An automatic tensioning wheel, characterized in that, The device includes a tensioning wheel body (1), a support arm (2), and a pulley (3). The two ends of the support arm (2) are respectively connected to the body (1) and the pulley (3). A first cavity (4) is provided between the support arm (2) and the outer wall of the body (1). The tensioning wheel includes an intermediate shaft (7) connecting the body (1) and the support arm (2). A second cavity (5) is provided between the support arm (2) and the intermediate shaft (7). The pulley (3) is provided with a groove (31) into which the support arm (2) extends. A third cavity (6) is provided between the outer wall of the support arm (2) and the inner wall of the groove (31). The tensioning wheel also includes a first sealing element located in the first cavity (4), a second sealing element located in the second cavity (5), and a third sealing element located in the third cavity (6) to seal the first cavity (4), the second cavity (5), and the third cavity (6).

2. The automatic tensioning wheel according to claim 1, characterized in that, At least one of the body (1) and the support arm (2) is provided with a mounting groove (101), the opening of the mounting groove (101) faces the first cavity (4), and the first seal is located in the mounting groove (101).

3. The automatic tensioning wheel according to claim 2, characterized in that, The mounting groove (101) is provided in two along the assembly direction of the body (1) and the support arm (2), and the first sealing element includes two first sealing rings (10) respectively disposed in the two mounting grooves (101).

4. The automatic tensioning wheel according to claim 3, characterized in that, Both of the mounting slots (101) are located on the body (1), and the first sealing ring (10) is bonded to the body (1).

5. The automatic tensioning wheel according to claim 1, characterized in that, A dust cover (8) is provided between the intermediate shaft (7) and the support arm (2), and a second cavity (5) is formed between the dust cover (8) and the support arm (2). The second sealing element includes a second sealing ring (11) disposed in the second cavity (5).

6. The automatic tensioning wheel according to claim 5, characterized in that, There are two second sealing rings (11), and both second sealing rings (11) are adhered to the dust cover (8).

7. The automatic tensioning wheel according to claim 1, characterized in that, At least one of the support arm (2) and the pulley (3) is provided with a snap-fit ​​groove (9), and the third seal includes a third sealing ring (12) disposed in the snap-fit ​​groove (9).

8. The automatic tensioning wheel according to claim 7, characterized in that, The inner wall and bottom wall of the support arm (2) and the groove (31) are provided with clearance gaps to form the third cavity (6). There are two third sealing rings (12), and the two third sealing rings (12) are respectively located on both sides of the support arm (2).

9. The automatic tensioning wheel according to claim 8, characterized in that, Both the support arm (2) and the pulley (3) are provided with the snap-fit ​​groove (9), and the two snap-fit ​​grooves (9) are axially offset.

10. The automatic tensioning wheel according to claim 8, characterized in that, The two third sealing rings (12) are respectively bonded to the inner wall of the corresponding snap-fit ​​groove (9).

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