A high-durability tensioner
Through multiple sealing designs and torque balancing designs, the problem of weak dustproof structure in traditional tensioners has been solved, achieving a highly durable dustproof effect and extending service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WENZHOU BRO AUTO PARTS CO LTD
- Filing Date
- 2025-10-09
- Publication Date
- 2026-07-03
AI Technical Summary
Traditional tensioners have weak dustproof structures, allowing mud and dust to easily enter through the gap between the swing arm and the shaft, leading to accelerated wear of core components such as bearings and springs, deterioration of the lubrication environment, and torque imbalance, resulting in a shortened service life.
It adopts a multi-seal design, including a first sealing ring, a dust cover, a dust pad, a second sealing ring, and a sealing cover. The torsional torque of the spiral spring is designed to be parallel to the force direction of the gear train. The riveting plate adopts a spin riveting method. The dust cover is made of nylon, and the sealing ring is made of rubber. The spiral spring is parallel to the force direction of the gear train to prevent wear and abnormal noise.
It effectively prevents the intrusion of mud, sand, and dust, protects key components, extends service life, reduces wear, lowers the risk of abnormal noise, improves torque balance, and extends service life.
Smart Images
Figure CN224453552U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to an improved invention of a tensioner, and more particularly to an improved invention of a high-durability tensioner. Background Technology
[0002] Traditional tensioners have weak dustproof structures and lack multiple sealing designs, allowing mud and dust to easily enter the interior through the gap between the swing arm and the shaft, leading to accelerated wear of core components such as bearings and springs.
[0003] Deterioration of the lubrication environment: Impurities contaminate the lubricating medium, reducing the efficiency of self-lubricating bearings and increasing the risk of frictional noise. Torque imbalance: Misalignment between the spring torque direction and the force direction of the gear train causes uneven bearing wear and stress concentration in the rivet plates, shortening service life. Utility Model Content
[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a high-durability tensioner.
[0005] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: This high-durability tensioner includes a housing, a shaft, a swing arm, and a pulley. The shaft is disposed inside the housing. One end of the swing arm is provided with a rotating cylinder, which is rotatably sleeved on the shaft. The pulley is disposed at the other end of the swing arm. The shaft is characterized in that: a riveting plate is provided at the upper end of the shaft. A first sealing ring is pressed between the inner ring of the riveting plate and the swing arm. A first sealing ring limiting groove is provided on the corresponding swing arm. A dustproof sleeve is sleeved on the outer ring of the riveting plate. The dustproof sleeve is pressed between the riveting plate and the swing arm. A downward protrusion is provided on the outer edge of the dustproof sleeve. An annular groove is provided on the corresponding swing arm. The annular groove matches the downward protrusion.
[0006] A spiral spring is provided between the rotating drum and the housing. One end of the spiral spring is connected to the rotating drum, and the other end of the spiral spring is connected to the housing. The torsional torque of the spiral spring is parallel to the force direction of the gear train.
[0007] A dustproof pad is provided between the upper edge of the housing and the lower end face of the swing arm, and radial limiting blocks are provided at both the inner and outer ends of the dustproof pad.
[0008] A second sealing ring is provided between the lower end of the rotating drum and the shaft core.
[0009] A sealing cover is fastened to the upper center of the pulley.
[0010] The riveting plate is riveted by spin riveting, and the inner ring of the riveting plate forms an indented structure.
[0011] The dust cover is made of nylon.
[0012] The first sealing ring is made of rubber and has a rectangular cross-section.
[0013] The second sealing ring is made of rubber and has a circular cross-section.
[0014] The upper end of the swing arm is provided with a square countersunk hole, and a pin positioning structure is provided between the swing arm and the housing.
[0015] The beneficial effects of this utility model are that the improved high-durability tensioner, by setting a first sealing ring, dust cover, dust pad, second sealing ring and sealing cover, can effectively protect the working environment of key components such as springs, self-lubricating bearings and bearings, and effectively prevent impurities such as mud and dust from entering; the torque balance design protects the main components such as bearings, self-lubricating bearings, riveting plates and damping components, reducing wear and extending service life. Attached Figure Description
[0016] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.
[0017] Figure 1 This is a schematic diagram of the structure of this utility model.
[0018] Figure 2 This is a cross-sectional view of the structure of this utility model. Detailed Implementation
[0019] The accompanying drawings illustrate the structure of this utility model, and further details will be described below with reference to the drawings. In this embodiment, see the attached drawings. Figure 1-2 This high-durability tensioner includes a housing 1, a shaft core 2, a swing arm 3, and a pulley 4. The shaft core 2 is disposed inside the housing 1. One end of the swing arm 3 is provided with a rotating cylinder 31, which is rotatably sleeved on the shaft core 2 and equipped with a self-lubricating bearing. The pulley 4 is disposed at the other end of the swing arm 3 and is equipped with a bearing. The upper end of the shaft core 2 is provided with a riveting plate 5. A first sealing ring 6 is pressed between the inner ring of the riveting plate 5 and the swing arm 3. The corresponding swing arm 3 is provided with a limiting groove for the first sealing ring 6 to block the axial dust intrusion path and ensure uniform sealing pressure. A dustproof sleeve 7 is sleeved on the outer ring of the riveting plate 5. The dustproof sleeve 7 is pressed between the riveting plate 5 and the swing arm 3, and a lower protrusion 71 is provided on the outer edge of the dustproof sleeve 7. The corresponding swing arm 3 is provided with an annular groove, which matches the lower protrusion 71 to form a labyrinth seal. The dustproof sleeve 7 is preferably made of nylon and serves to prevent dust, reduce wear, and increase damping. In addition, the riveting plate 5 is preferably riveted by spin riveting, and the inner ring of the riveting plate 5 forms an indented structure, which better compresses the first sealing ring 6.
[0020] As a further improved implementation, a spiral spring 8 is provided between the rotating drum 31 and the housing 1. One end of the spiral spring 8 is connected to the rotating drum 31, and the other end is connected to the housing 1. The torsional torque direction of the spiral spring 8 is parallel to the force direction of the gear train. The torsional torque direction of the spiral spring 8 depends on the connection position of the force-bearing end and is tangential to it. The force direction of the gear train depends on the position of the belt on the pulley 4 and is parallel to its wrap angle center line. By calculating that the two force directions cancel each other out, the product can be prevented from tilting outward when the pulley 4 is loaded. This can effectively extend the uniform wear of the plastic parts' friction pairs, thereby extending the service life of the plastic parts. In addition, ensuring product alignment can also reduce the risk of belt cutting noise.
[0021] As a further improved specific implementation, a dustproof pad 9 is provided between the upper edge of the housing 1 and the lower end face of the swing arm 3. The dustproof pad 9 covers the gap between the housing 1 and the swing arm 3 and plays a role in dust prevention. Radial limiting blocks are provided at both the inner and outer ends of the dustproof pad to limit the radial displacement of the dustproof pad and prevent the dustproof pad from failing due to displacement.
[0022] As a further improved implementation, a second sealing ring 21 is provided between the lower end of the rotating drum 31 and the shaft core 2. The sealing ring is limited by the limiting step to prevent mud and dust from entering the self-lubricating bearing.
[0023] As a further improvement, a sealing cover 41 is fastened to the upper center of the pulley 4 to prevent mud, sand and dust from falling into the pulley system structure.
[0024] As a further improved specific implementation, the first sealing ring 6 is made of rubber and has a rectangular cross-section, which is suitable for extrusion processes.
[0025] As a further improved embodiment, the second sealing ring is made of rubber and has a circular cross-section.
[0026] As a further improved implementation, the upper end of the swing arm 3 is provided with a square countersunk hole 31, and a pin positioning structure 32 is provided between the swing arm 3 and the housing 1. The square countersunk hole serves as a positioning device when installing the tensioner, and the pin positioning structure restricts the initial position of the swing arm 3 and the housing 1. When installing the tensioner, it needs to be removed, reducing the adjustment during tensioner installation and saving time and effort.
[0027] In summary, the above are merely preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.
Claims
1. A high durability tensioner comprising a housing, a shaft core, a swing arm and a pulley, the shaft core is arranged in the housing, the swing arm is provided with a rotating drum at one end, the rotating drum is rotatably sleeved on the shaft core, and the pulley is arranged at the other end of the swing arm, characterized in that: The upper end of the shaft core is provided with a riveting plate. A first sealing ring is pressed between the inner ring of the riveting plate and the swing arm. The corresponding swing arm is provided with a first sealing ring limiting groove. A dust cover is fitted on the outer ring of the riveting plate. The dust cover is pressed between the riveting plate and the swing arm. A lower protrusion is provided on the outer edge of the dust cover. The corresponding swing arm is provided with an annular groove. The annular groove matches the lower protrusion. 2. The high-durability tensioner of claim 1, wherein: A spiral spring is provided between the rotating drum and the housing. One end of the spiral spring is connected to the rotating drum, and the other end of the spiral spring is connected to the housing. The torsional torque of the spiral spring is parallel to the force direction of the gear train.
3. The high-duty tensioner of claim 1, wherein: A dustproof pad is provided between the upper edge of the housing and the lower end face of the swing arm, and radial limiting blocks are provided at both the inner and outer ends of the dustproof pad.
4. The high-durability tensioner as described in claim 1, characterized in that: A second sealing ring is provided between the lower end of the rotating drum and the shaft core.
5. The high-durability tensioner of claim 1, wherein: A sealing cover is fastened to the upper center of the pulley.
6. The high-durability tensioner of claim 1, wherein: The riveting plate is riveted by spin riveting, and the inner ring of the riveting plate forms an indented structure.
7. The high-duty tensioner of claim 1, wherein: The dust cover is made of nylon.
8. The high-duty tensioner of claim 1, wherein: The first sealing ring is made of rubber and has a rectangular cross-section.
9. The high-duty tensioner of claim 4, wherein: The second sealing ring is made of rubber and has a circular cross-section.
10. The high-durability tensioner of claim 1, wherein: The upper end of the swing arm is provided with a square countersunk hole, and a pin positioning structure is provided between the swing arm and the housing.