Tensioner with high sealing performance

Abstract

The tensioner with the high sealing performance comprises a tensioning arm and a base, an annular installation groove is formed in the side, facing the base, of the tensioning arm, the upper end of the base is embedded in the annular installation groove, and a sealing ring is arranged between the outer wall of the base and the inner wall of the annular installation groove. The sealing ring comprises a first linear section on the inner side, a third linear section on the outer side and a second linear section transversely connected between the first linear section and the third linear section, and the second linear section inclines downwards from inside to outside. By improving the structure of the sealing ring and utilizing the plasticity of rubber, small-gap sealing is achieved, and the sealing capacity is improved.

Description

Technical Field

[0001] This utility model relates to the field of tensioner technology, and in particular to a tensioner with high sealing performance. Background Technology

[0002] The tensioner is a key component of the engine accessory in a hybrid vehicle system. It is mainly used in the belt drive system to maintain belt tension, prevent belt slippage, and ensure the engine can smoothly transmit power to the accessory. Existing tensioner structures, such as the utility model patent with authorization announcement number CN217898674U, which discloses a tensioner, engine accessory system, and engine, employ a lip seal. This lip seal has a flat structure in the middle, which, under stress or temperature changes, cannot fit tightly. It has poor sealing ability against small-diameter foreign objects and dust, and liquids such as water can easily enter through the gaps. The relatively weak sealing ability allows foreign objects, dust, and other contaminants to easily enter the tensioner's interior, causing severe wear and rust on internal parts, leading to a decrease in the lifespan of internal components and the tensioner itself.

[0003] Therefore, it is necessary to improve the existing sealing structure to solve the above problems. Utility Model Content

[0004] The technical problem to be solved by this utility model is: in order to overcome the shortcomings of the prior art, this utility model provides a tensioner with high sealing performance.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a tensioner with high sealing performance, including a tensioning arm and a base. The tensioning arm has an annular mounting groove on the side facing the base. The upper end of the base is embedded in the annular mounting groove, and a sealing ring is provided between the outer wall of the base and the inner wall of the annular mounting groove. The sealing ring includes an inner first straight segment, an outer third straight segment, and a second straight segment that is transversely connected between the first straight segment and the third straight segment. Preferably, the first straight segment and the third straight segment are arranged in parallel, and the second straight segment is inclined downward from the inside to the outside.

[0006] Furthermore, the angle α between the second straight line segment and the first straight line segment is 65°-75°.

[0007] Furthermore, the length H1 of the first straight segment is at least 3.5 mm, the length H3 of the third straight segment is at least 1.5 mm, and the length H2 of the second straight segment is determined by the distance between the tensioning arm and the base mating surface.

[0008] Furthermore, the sealing ring is generally made of an elastic material, such as rubber, and therefore its rigidity is generally low. Therefore, to ensure a reliable connection of the sealing ring, a support frame is embedded in the inner ring of the first straight segment. The support frame is located on the side where the sealing ring fits against the base, increasing the holding force with the base while ensuring elastic tension, thus improving the reliability of the connection.

[0009] Furthermore, to avoid stress concentration at the corners and affecting the service life of the sealing ring, a first arc segment for transition is provided between the first straight segment and the second straight segment, and a second arc segment for transition is provided between the second straight segment and the third straight segment.

[0010] Furthermore, the thicknesses D1 of the first straight segment, D2 of the second straight segment, and D3 of the third straight segment satisfy the relationship: D1 > D2 > D3.

[0011] Preferably, the thickness D2 of the second straight segment gradually decreases from the first straight segment to the third straight segment.

[0012] Preferably, the thickness D3 of the third straight segment gradually decreases downwards from the second straight segment.

[0013] Furthermore, it also includes a clutch assembly and a pulley assembly, wherein,

[0014] The pulley assembly and clutch assembly are respectively installed at both ends of the tensioning arm. The clutch assembly includes a first dust cover, a pivot, a bushing, a spring seat, an annular ring, and a spring. A bushing is provided on the tensioning arm inside the base. The pivot passes through the lower end of the bushing and is fixedly connected to the base. A bushing is also provided between the pivot and the bushing. The first dust cover is provided on the upper end of the pivot and is fixedly connected to the tensioning arm. The spring is sleeved on the outside of the bushing, with the upper end of the spring abutting against the tensioning arm and the lower end abutting against the base. The annular ring and the spring seat are arranged from the inside to the outside between the spring and the inner wall of the base.

[0015] The pulley assembly includes a pulley, bolts, and a second dust cover. The pulley is bolted to the tensioning arm, and the second dust cover is located on the end face of the pulley away from the tensioning arm.

[0016] The beneficial effects of this utility model are: This utility model provides a tensioner with high sealing performance, which achieves a smaller gap seal and improves sealing ability by improving the structure of the sealing ring and utilizing the plasticity of rubber. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1This is an exploded structural diagram of the tensioner of this utility model.

[0019] Figure 2 This is a cross-sectional structural diagram of the tensioner of this utility model.

[0020] Figure 3 yes Figure 2 A magnified structural diagram of point A in the middle.

[0021] Figure 4 This is a schematic diagram illustrating the principle of external pressure on the sealing ring.

[0022] Figure 5 This is a schematic diagram of the sealing ring.

[0023] Figure 6 This is a cross-sectional structural diagram of the sealing ring.

[0024] In the diagram: 1. First dust cover, 2. Pivot, 3. Bushing, 4. Tensioning arm, 5. Sealing ring, 51. First straight segment, 52. First arc segment, 53. Second straight segment, 54. Second arc segment, 55. Third straight segment, 6. Pulley, 7. Spring seat, 8. Second dust cover, 9. Ring, 10. Bolt, 11. Spring, 12. Base, 13. Support frame. Detailed Implementation

[0025] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0028] like Figure 1 and Figure 2 As shown, this utility model discloses a high-sealing tensioner, including a tensioning arm 4 and a base 12, as well as a clutch assembly and a pulley assembly. Both the clutch assembly and the pulley assembly are conventional structures. Specifically, the pulley assembly and the clutch assembly are respectively installed at both ends of the tensioning arm 4. The clutch assembly includes a first dust cover 1, a pivot 2, a bushing 3, a spring seat 7, an annular ring 9, and a spring 11. A bushing is provided on the tensioning arm 4 inside the base 12, and the pivot 2 passes through the lower end of the bushing and is fixedly connected to the base 12. A bushing 3 is provided between the pivot 2 and the bushing. The first dust cover 1 is placed on the upper end of the pivot 2 and fixedly connected to the tensioning arm 4. The spring 11 is sleeved on the outside of the bushing, and the upper end of the spring 11 abuts against the tensioning arm 4, and the lower end abuts against the base 12. The annular ring 9 and the spring seat 7 are arranged from the inside to the outside between the inner wall of the spring 11 and the inner wall of the base 12. The pulley assembly includes a pulley 6, a bolt 10 and a second dust cover 8. The pulley 6 is connected to the tensioning arm 4 by the bolt 10, and the second dust cover 8 is placed on the end face of the pulley 6 away from the tensioning arm 4.

[0029] like Figures 3-6As shown, a sealing ring 5 is used as a sealing structure between the tensioning arm 4 and the base 12. Specifically, the tensioning arm 4 has an annular mounting groove on the side facing the base 12, and the upper end of the base 12 is embedded in the annular mounting groove. A sealing ring 5 is provided between the outer wall of the base 12 and the inner wall of the annular mounting groove. The sealing ring 5 includes an inner first straight segment 51, an outer third straight segment 55, and a second straight segment 53 that is transversely connected between the first straight segment 51 and the third straight segment 55. Preferably, the first straight segment 51 and the third straight segment 55 are arranged in parallel, and the second straight segment 53 is inclined downward from the inside to the outside. The included angle α between the second straight segment 53 and the first straight segment 51 is 65°-75°. The length H1 of the first straight segment 51 is at least 3.5mm, the length H3 of the third straight segment 55 is at least 1.5mm, and the length H2 of the second straight segment is determined by the distance between the mating surfaces of the tensioning arm 4 and the base 12. In this embodiment, preferably, the included angle α is 70°, the length of the first straight segment 51 is 3.5mm, and the length of the third straight segment 55 is 1.5mm. To avoid stress concentration at the corners and affecting the service life of the sealing ring 5, a first arc segment 52 for transition is provided between the first straight segment 51 and the second straight segment 53, and a second arc segment 54 for transition is provided between the second straight segment 53 and the third straight segment 55. Figure 3 As shown, the sealing ring 5 is marked with a, b, c, d, e, and f. In the figure, segment ab is the first straight line segment 51, segment bc is the first circular arc segment 52, segment cd is the second straight line segment 53, segment de is the second circular arc segment 54, and segment ef is the third straight line segment 55.

[0030] like Figure 5 and Figure 6 As shown, the sealing ring 5 is generally made of an elastic material, preferably rubber in this embodiment. Therefore, its rigidity is generally low. To ensure reliable connection of the sealing ring 5, a support frame 13 is embedded in the inner ring of the first straight segment 51. The support frame 13 is located on the side where the sealing ring 5 fits against the base 12, increasing the holding force with the base 12 while ensuring elastic tension, thus improving the reliability of the connection. The thickness D1 of the first straight segment 51, the thickness D2 of the second straight segment 53, and the thickness D3 of the third straight segment 55 satisfy the relationship: D1 > D2 > D3. The thickness gradually decreases from the inside to the outside, meaning the rigidity gradually weakens, making it easier for the sealing ring 5 to deform from position D1 to D3, thereby achieving the sealing function through increased angle and deformation. Preferably, the thickness D2 of the second straight segment 53 gradually decreases from the first straight segment 51 towards the third straight segment 55. The thickness D3 of the third straight segment 55 gradually decreases downwards from the second straight segment 53.

[0031] Working principle:

[0032] Under normal conditions, there is only a very small gap between the inside and outside environment of the tensioner, namely the gap between the ef section and the tensioning arm 4. This gap can be designed to be as small as zero, that is, they are in contact with each other, which can greatly improve the internal sealing capability of the tensioner.

[0033] like Figure 4 As shown, if the tensioner is subjected to water wading conditions due to the vehicle's environment, the cd segment of the sealing ring 5 will rotate counterclockwise near point b under the influence of water pressure. That is, the angle α between the cd segment and the ab segment increases. At this time, the gap between the sealing segment, i.e., the ef segment, and the inner side of the tensioning arm 4 will decrease until they make contact, forming a sealing condition. Moreover, this contact force will increase with the increase of water pressure, and the sealing ability will also be improved. When the external water pressure disappears, the sealing ring 5, due to its rubber material, will spring back to its initial state. The red arrow in the figure indicates the direction of pressure.

[0034] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the scope of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A high sealing performance tensioner characterized by: The tensioning arm and the base are provided with an annular mounting groove on one side of the base, the upper end of the base is embedded in the annular mounting groove, and a sealing ring is arranged between the outer wall of the base and the inner wall of the annular mounting groove, the sealing ring comprises a first straight line segment on the inner side, a third straight line segment on the outer side, and a second straight line segment transversely connected between the first straight line segment and the third straight line segment, and the second straight line segment is inclined downward from the inside to the outside.

2. The high sealing performance tensioner of claim 1, wherein: The included angle α between the second straight line segment and the first straight line segment is 65°-75°.

3. The high sealing performance tensioner of claim 1, wherein: The length H1 of the first straight line segment is at least 3.5 mm, the length H3 of the third straight line segment is at least 1.5 mm, and the length H2 of the second straight line is determined according to the distance between the combination surface of the tensioning arm and the base.

4. The high sealing performance tensioner of claim 1, wherein: A support framework is embedded on the inner ring of the first straight line segment.

5. The high sealability tensioner of claim 1, wherein: A first circular arc segment is arranged between the first straight line segment and the second straight line segment for transition, and a second circular arc segment is arranged between the second straight line segment and the third straight line segment for transition.

6. The high sealability tensioner of claim 1, wherein: The thickness D1 of the first straight line segment, the thickness D2 of the second straight line segment, and the thickness D3 of the third straight line segment satisfy the relationship: D1>D2>D3.

7. The high sealing performance tensioner of claim 6, wherein: The thickness D2 of the second straight line segment gradually decreases from the first straight line segment to the third straight line segment.

8. The high sealing performance tensioner of claim 6, wherein: The thickness D3 of the third straight line segment gradually decreases downward from the second straight line segment.

9. High sealing performance tensioner according to any of claims 1-8, characterized in that: Further comprising a clutch assembly and a pulley assembly, The pulley assembly and the clutch assembly are respectively installed at both ends of the tensioning arm, wherein the clutch assembly comprises a first dust cover, a pivot, a bushing, a spring seat, a ring-shaped ring and a spring, wherein the tensioning arm on the inner side of the base is provided with a shaft sleeve, the pivot is penetratingly connected with the base through the lower end of the shaft sleeve, the bushing is further arranged between the pivot and the shaft sleeve, the first dust cover is arranged on the upper end of the pivot and is fixedly connected with the tensioning arm, the spring is arranged outside the shaft sleeve, the upper end of the spring abuts against the tensioning arm, and the lower end of the spring abuts against the base, the ring-shaped ring and the spring seat are arranged between the spring and the inner wall of the base from the inside to the outside; The pulley assembly comprises a pulley, a bolt and a second dust cover, the pulley is connected to the tensioning arm through the bolt, and the second dust cover is arranged on the end face of the pulley away from the tensioning arm.

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