Detachable maintenance type tensioner

Abstract

The utility model discloses a detachable maintenance type tensioner which comprises a base, a swing arm, a spring assembly, an arc-shaped damping piece and a belt wheel assembly, a pivot is installed in the center of the round base, the spring assembly is arranged on the outer side of the pivot, one end of the swing arm is a pivot joint end, the other end of the swing arm is a swing end, and a shaft hole is formed in the inner side face of the pivot joint end of the swing arm. The inner side of the shaft hole is rotationally connected to the pivot through a lining, an annular housing is further arranged on the inner side face of the pivot joint end around the shaft hole, the spring assembly is surrounded by the annular housing, a rectangular notch is formed in the annular housing, mounting holes are formed in the two sides of the rectangular notch, and the arc-shaped damping pieces are detachably connected to the mounting holes through fixing bolts. The inner side cambered surface of the arc-shaped damping piece makes contact with the spring assembly, the belt wheel assembly is arranged at the swing end of the swing arm and applies thrust to the swing arm, the swing arm drives the spring assembly to twist, and the spring assembly and the arc-shaped damping piece rub to generate resistance; the arc-shaped damping piece can be maintained and replaced from the outside, and the service life of the tensioner is prolonged.

Description

Technical Field

[0001] This utility model belongs to the technical field of engine accessory tensioners, specifically relating to a detachable and maintainable tensioner. Background Technology

[0002] Tensioners are installed in engine accessory systems and are mainly used to maintain proper tension in belts or chains, reduce vibration and noise, and extend service life. The damping structure within the tensioner absorbs vibration and impact. Existing tensioners achieve damping through friction, and the wear caused by this friction is irreversible. This means that the damping performance of the tensioner decreases as vehicle mileage increases. Currently, the lifespan of most conventional tensioners is sufficient for passenger vehicles, but for commercial vehicles and other applications requiring long-mileage or long-life tensioner applications, existing tensioners are insufficient.

[0003] A tensioner structure is disclosed in patent application CN217898674U. To avoid metal debris generated by friction between the metal frame and the swing arm, a damping pad is provided between the sealing gasket 4 and the swing arm 5. This damping pad is supported by a non-metallic wear-resistant material, preventing direct contact and friction between the metal frame of the sealing gasket and the swing arm. As described in this structure, the damping pad is generally assembled inside the tensioner. The damping pad is made of plastic, and during long-term friction, it is constantly worn and aged, inevitably losing its damping performance. However, because it cannot be easily removed and replaced from the tensioner, damping failure often occurs without timely maintenance, reducing the safety and stability of the tensioner. Utility Model Content

[0004] To address the aforementioned problems and technical needs, this utility model provides a detachable and maintainable tensioner. By adopting an external installation method, the damping components, which were originally assembled internally, are now assembled externally, allowing for convenient maintenance and replacement of the damping components and extending the service life of the tensioner.

[0005] The technical solution of this utility model is as follows: A detachable and maintainable tensioner includes a base, a swing arm, a spring assembly, an arc-shaped damping element, and a pulley assembly. A pivot is installed at the center of the circular base, and a spring assembly is provided on the outside of the pivot. One end of the swing arm is a pivot end, and the other end is a swing end. The inner side of the pivot end of the swing arm is provided with a shaft hole. The inner side of the shaft hole is rotatably connected to the pivot through a bushing. An annular cover is also provided around the shaft hole on the inner side of the pivot end. The annular cover surrounds the spring assembly. A rectangular notch is provided on the annular cover. Mounting holes are provided on both sides of the rectangular notch. The arc-shaped damping element is detachably connected to the mounting holes through a set of fixing bolts. The inner arc surface of the arc-shaped damping element contacts the spring assembly. The pulley assembly is located at the swing end of the swing arm. The pulley assembly applies a thrust to the swing arm, and the swing arm drives the spring assembly to twist. The friction between the spring assembly and the arc-shaped damping element generates resistance.

[0006] In the above scheme, a rectangular notch is provided on the annular cover so that the arc-shaped damping component can contact the components inside the cover through the rectangular notch and generate damping force under relative rotation conditions; the arc-shaped damping component located on the outside can be easily replaced to avoid damping failure and improve operational stability.

[0007] Furthermore, the arc-shaped damping component includes a plastic damping sheet and an outer support sheet metal sheet. The outer support sheet metal sheet is arc-shaped, and the plastic damping sheet with the same curvature is fixedly adhered to the inner surface of the outer support sheet metal sheet.

[0008] Furthermore, the outer support sheet metal plate has straight connecting ears on both sides, and a screw hole in the middle of the connecting ear. The fixing bolt passes through the screw hole and the mounting hole from the outside to the inside to connect the outer support sheet metal plate to the annular cover. The plastic damping sheet is embedded in the rectangular notch and abuts against the spring assembly.

[0009] The structure features an inner and outer layer. The inner plastic damping sheet provides damping force, while the outer supporting sheet metal has high rigidity, which can support the inner plastic damping sheet, isolate it from the external environment, protect the plastic damping sheet, and delay its aging.

[0010] Furthermore, the spring assembly includes a torsion spring and an annular sleeve. The upper and lower ends of the torsion spring are respectively limited by the swing arm and the base. The annular sleeve is disposed on the outside of the torsion spring. The annular sleeve is relatively fixed to the base. The annular sleeve does not contact the torsion spring. The outside of the annular sleeve is in contact with the plastic damping sheet.

[0011] The pulley is subjected to tension, which drives the swing arm to rotate. The swing arm drives the torsion spring to twist on the base. The base and the annular sleeve remain stationary. The annular cover drives the arc-shaped damping plate to rotate, causing the arc-shaped damping plate to rub against the outer surface of the annular sleeve to generate damping force.

[0012] Furthermore, the pulley assembly includes a fixed bushing, a locking bolt, a pulley, and a bearing. A circular base is provided on one side of the swing end of the swing arm, and a fixed bushing is provided at the center of the circular base. The locking bolt passes through the bearing and is connected to the fixed bushing. A pulley is installed on the outside of the bearing.

[0013] Furthermore, each end of the bearing is provided with a dust cover, which covers the bearing and the connection between the bearing and the pulley. The dust covers prevent dust from entering the bearing, keeping it clean and allowing the pulley to rotate smoothly.

[0014] The beneficial effects of this utility model are as follows: The arc-shaped damping plate is positioned on the outside of the annular cover, and a rectangular notch on the annular cover provides a window for the arc-shaped damping plate to contact the inner annular sleeve, allowing the arc-shaped damping plate on the outside to provide damping force in the same way as the one on the inside. Furthermore, the arc-shaped damping plate, installed with two fixing bolts, allows for easy inspection and replacement; only the fixing bolts need to be removed during replacement, and the rest of the tensioner structure does not require disassembly, thus greatly improving operational convenience and ensuring the effective operation of the tensioner. The arc-shaped damping plate itself adopts a double-layer structure; the outer sheet metal part has high strength, providing isolation and support, while the inner plastic damping plate generates damping through friction with the annular sleeve. Protected by the sheet metal part, the plastic damping plate slows down aging and maintains stable operation. This structure simultaneously meets the tensioner's requirements for the friction coefficient of the damping parts and also extends the service life and lifespan of the tensioner by allowing for disassembly and maintenance of the damping module. Attached Figure Description

[0015] Figure 1 This is an exploded view of the structure of a detachable and maintainable tensioner according to the present invention.

[0016] Figure 2 This is an external assembly structure diagram of a detachable and maintainable tensioner according to the present invention;

[0017] Figure 3 This is a cross-sectional view of the pivot end of the swing arm in this utility model;

[0018] The components in the diagram are labeled as follows: base 1, swing arm 2, pivot end 21, shaft hole 211, swing end 22, annular cover 23, rectangular notch 231, mounting hole 232, spring assembly 3, torsion spring 31, annular sleeve 32, arc-shaped damping component 4, plastic damping sheet 41, outer support sheet metal component 42, connecting ear 43, screw hole 431, fixing bolt 44, pulley assembly 5, circular base 51, fixing bushing 52, locking bolt 53, pulley 54, bearing 55, dust cover 56, pivot 6, bushing 61. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] like Figure 1-3 The diagram shows a detachable and maintainable tensioner according to the present invention, comprising a base 1, a swing arm 2, a spring assembly 3, an arc-shaped damping element 4, and a pulley assembly 5. A pivot 6 is mounted at the center of the circular base 1, and the spring assembly 3 is provided on the outer side of the pivot 6. One end of the swing arm 2 is a pivot end 21, and the other end is a swing end 22. The inner side of the pivot end 21 of the swing arm is provided with a shaft hole 211, and the inner side of the shaft hole 211 is rotatably connected to the pivot 6 through a bushing 61. The pulley assembly 5 is located at the swing end 22 of the swing arm 2. The pulley assembly 5 includes a fixed bushing 52, a locking bolt 53, a pulley 54, and a bearing 55. A circular base 51 is provided on one side of the swing end of the swing arm 2, and a fixed bushing 52 is provided at the center of the circular base 51. The locking bolt 53 passes through the bearing 55 and is connected to the fixed bushing 52. The pulley 54 is mounted on the outer side of the bearing 55.

[0021] A dust cover 56 is provided at each end of the bearing 55, covering the bearing 55 and the connection between the bearing 55 and the pulley 54. The dust cover 56 can prevent dust from entering the bearing 55, keep the bearing 55 clean, and allow the pulley 54 to rotate smoothly.

[0022] An annular cover 23 is provided on the inner side of the pivot end 21 around the shaft hole 211. The annular cover 23 surrounds the spring assembly 3. A rectangular notch 231 is provided on the annular cover 231. Mounting holes 232 are provided on both sides of the rectangular notch 231. The arc-shaped damping element 4 is detachably connected to the mounting holes 232 by a set of fixing bolts 44. The inner arc surface of the arc-shaped damping element 4 contacts the spring assembly 3. The pulley assembly 5 applies a thrust to the swing arm 2. The swing arm 2 drives the spring assembly 3 to twist. The friction between the spring assembly 3 and the arc-shaped damping element 4 generates resistance.

[0023] The arc-shaped damping component 4 includes a plastic damping sheet 41 and an outer support sheet metal sheet 42. The outer support sheet metal sheet 42 is arc-shaped, and the plastic damping sheet 41, which has the same curvature, is fixedly adhered to the inner surface of the outer support sheet metal sheet 42. Straight connecting ears 43 are provided on both sides of the outer support sheet metal sheet 42. A screw hole 431 is provided in the middle of the connecting ear 43. The fixing bolt 44 passes through the screw hole 431 and the mounting hole 232 from the outside to the inside, connecting the outer support sheet metal sheet 42 to the annular cover 23. The plastic damping sheet 41 is embedded in the rectangular notch 231 and abuts against the spring assembly 3.

[0024] A rectangular notch 231 is provided on the annular cover 23, allowing the arc-shaped damping element 4 to contact the components inside the cover through the rectangular notch 231, generating damping force under relative rotation conditions. The arc-shaped damping element 4 located on the outer side can be easily replaced, preventing damping failure and improving operational stability. A two-layer structure is provided: the inner plastic damping sheet 41 provides damping force, while the outer supporting sheet metal sheet 42 has high rigidity, supporting the inner plastic damping sheet 41 and isolating it from the external environment, protecting the plastic damping sheet 41 and delaying its aging.

[0025] The spring assembly 3 includes a torsion spring 31 and an annular sleeve 32. The upper and lower ends of the torsion spring 31 are limited by the swing arm 2 and the base 1, respectively. The annular sleeve 32 is disposed on the outside of the torsion spring 31. The annular sleeve 32 is fixed relative to the base 1. The annular sleeve 32 does not contact the torsion spring 31. The outside of the annular sleeve 32 is in contact with the plastic damping sheet 41.

[0026] The operating principle of this invention is as follows: The pulley 54 is pressed against the belt. The pulley 54 oscillates due to the belt tension, driving the swing arm 2 to rotate. The swing arm 2 drives the torsion spring 31 to twist on the base 1. The base 1 and the annular sleeve 32 remain stationary. The annular cover 23 drives the arc-shaped damping plate 4 to rotate, causing friction between the arc-shaped damping plate 4 and the outer surface of the annular sleeve 32 to generate damping force. After prolonged use, the arc-shaped damping plate 4 needs to be replaced. Installed by two fixing bolts 44, the arc-shaped damping plate 4 can be easily inspected and replaced. Replacement only requires removing the fixing bolts 44; other structures of the tensioner do not need to be disassembled, thus greatly improving operational convenience and ensuring the effective operation of the tensioner.

[0027] The above descriptions are merely several preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations and substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A demountably serviceable tensioner characterized by: The invention discloses a damping device, which comprises a base, a swing arm, a spring assembly, an arc-shaped damping piece and a pulley assembly.

2. A demountably serviceable tensioner as in claim 1, wherein: The arc-shaped damping piece comprises a plastic damping piece and an outer supporting sheet, the outer supporting sheet is arc-shaped, and the plastic damping piece with the same arc is fixedly adhered to the inner side of the outer supporting sheet.

3. A demountably mounted tensioner as in claim 2 wherein: The outer supporting sheet is connected to the annular cover through the fixing bolt from the outside to the inside through the screw hole and the mounting hole.

4. A demountably mounted tensioner as in claim 3 wherein: The spring assembly comprises a torsion spring and an annular sleeve, the upper and lower ends of the torsion spring are respectively limited by the swing arm and the base, the annular sleeve is arranged on the outer side of the torsion spring, the annular sleeve is relatively fixed with the base, the annular sleeve is not in contact with the torsion spring, and the outer side of the annular sleeve is in contact with the plastic damping piece.

5. A demountably mounted tensioner as in claim 4 wherein: The pulley assembly comprises a fixed shaft sleeve, a locking bolt, a pulley and a bearing, one side of the swing arm swing end is provided with a circular base, the center of the circular base is provided with the fixed shaft sleeve, the locking bolt is connected with the fixed shaft sleeve through the bearing, and the bearing is provided with the pulley on the outer side.

6. A demountably mounted tensioner as in claim 5 wherein: The bearing is provided with a dust cover at two ends, and the dust cover covers the bearing and the connection between the bearing and the pulley.

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