Fully-sealed dustproof tensioning wheel
By incorporating structures such as rubber edging, sealing rings, dust covers, and retaining rings on the tensioner, the problem of insufficient sealing under harsh working conditions is solved, achieving comprehensive dust protection and improving the dustproof performance and durability of the bearing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WENZHOU BRO AUTO PARTS CO LTD
- Filing Date
- 2025-06-16
- Publication Date
- 2026-05-01
AI Technical Summary
Existing tensioning pulleys are prone to bearing failure under harsh working conditions due to the ingress of dust and mud, and the tensioning area lacks a comprehensive dustproof structure or has poor protective durability.
A fully sealed dustproof tensioning wheel was designed, which adopts a rubber edging, a first sealing ring, a second sealing ring, a dust cover, a dustproof baffle ring, and a labyrinth-type dustproof flange structure to enhance the sealing performance, and improves the dustproof effect through a worm-shaped coil spring and a dustproof baffle.
It achieves all-round sealing and dust prevention, improves the dust prevention performance of the tensioner wheel, prevents dust and mud from entering, and extends the service life of the bearing.
Smart Images
Figure CN224187976U_ABST
Abstract
Description
Fully sealed dustproof tensioner Technical Field
[0001] This utility model relates to an improved invention of a tensioning wheel, and more particularly to an improved invention of a fully sealed dustproof tensioning wheel. Background Technology
[0002] Tensioners are typically installed in engine pulley systems. Under harsh operating conditions, dust and mud can enter the tensioner and cause bearing failure. Therefore, the bearings of pulleys are equipped with dustproof structures. However, the tensioning areas of the tensioner, such as between the shaft and the rocker arm, and between the rocker arm and the housing, usually lack sealed dustproof structures, or the sealed dustproof structures are incomplete or have poor durability. Summary of the Invention
[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a fully sealed dustproof tensioning wheel.
[0004] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: A fully sealed dustproof tensioning wheel includes a housing, a shaft, a swing arm, and a pulley. The shaft is disposed inside the housing. One end of the swing arm has a rotating cylinder rotatably mounted on the shaft. A central sleeve is provided between the rotating cylinder and the shaft. A worm-shaped coil spring is provided between the rotating cylinder and the housing. A riveting plate is provided at the upper end of the shaft. The pulley is located at the other end of the swing arm. The key feature is that: an annular protrusion is provided on the swing arm corresponding to the outer edge of the riveting plate; a rubber edging is provided on the outer edge of the riveting plate, and the rubber edging seals with the annular protrusion. A first sealing ring is provided between the upper end of the rotating cylinder and the riveting plate, and a second sealing ring is provided between the lower end of the rotating cylinder and the housing. The inner end of the worm-shaped coil spring is hooked onto the rotating cylinder, and the outer end of the worm-shaped coil spring passes through the housing. A dustproof cover is provided on the corresponding outer side of the housing. A dustproof retaining ring is sandwiched between the lower end of the swing arm and the upper end of the housing, with the corresponding ring located on the outer side.
[0005] A disc spring, a steel plate, and a nylon plate are sequentially arranged between the upper end of the swing arm and the lower end of the riveting plate. The riveting plate generates damping through the pressure of the disc spring.
[0006] The pulley includes a wheel body, a bearing, and bolts. Dustproof baffles are provided at both ends of the bearing. The dustproof baffle ring is fixed by bolts. The inner edge of the dustproof baffle extends into the center hole of the bearing. The inner ring of the dustproof baffle fits against the end face of the bearing. The outer edge of the dustproof baffle has a labyrinth-shaped dustproof flange structure.
[0007] The rubber edging, the first sealing ring, and the second sealing ring are made of fluororubber.
[0008] The beneficial effect of this utility model is that the improved fully sealed dustproof tensioning wheel improves the sealing performance of the tensioning wheel by setting up structures such as rubber edging, first sealing ring, second sealing ring, dust cover, dustproof baffle ring, and dustproof baffle, and provides all-round dust protection for the tensioning wheel. Attached Figure Description
[0009] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.
[0010] Figure 1 is a schematic diagram of the structure of this utility model.
[0011] Figure 2 is a top view of the structure of this utility model.
[0012] Figure 3 is a BB cross-sectional view of Figure 2 of this utility model.
[0013] Figure 4 is a CC cross-sectional view of Figure 3 of this utility model. Detailed Implementation
[0014] The accompanying drawings illustrate the structure of this utility model, and the relevant details will be further explained below with reference to the drawings. In this embodiment, referring to Figures 1-4, the fully sealed dustproof tensioning wheel includes a housing 1, a shaft 2, a swing arm 3, and a pulley 4. The shaft 2 is disposed inside the housing 1. One end of the swing arm 3 is provided with a rotating cylinder 5, which is rotatably mounted on the shaft 2. A central sleeve 6 is provided between the rotating cylinder 5 and the shaft 2. A worm gear spring 7 is provided between the rotating cylinder 5 and the housing 1 to provide torsional force to the swing arm 3. A riveting plate 8 is provided at the upper end of the shaft 2, which limits the movement of the shaft 2. The pulley 4 is disposed at the other end of the swing arm 3. An annular flange 9 is provided on the swing arm 3 corresponding to the outer edge of the riveting plate 8. A rubber edging 10 is provided on the outer edge of the riveting plate 8, which seals against the annular flange 9. A first sealing ring 11 is provided between the upper end of the rotating cylinder 5 and the riveting plate 8. The first sealing ring 11 is disposed in the annular groove at the upper end of the rotating cylinder 5 and seals against the riveting plate 8. A second sealing ring 11 is provided between the lower end of the rotating cylinder 5 and the housing 1. The sealing ring 12 is fitted onto the central convex ring of the housing 1 and seals against the rotating cylinder 5. The first sealing ring 11 and the second sealing ring 12 provide a sealing and dustproof function between the shaft core 2 and the rotating cylinder 5. The inner end of the worm coil spring 7 is hooked onto the rotating cylinder 5, and the outer end of the worm coil spring 7 passes through the housing 1 and is folded back and limited on the outside of the housing 1. A dust cover 13 is provided on the outer side of the housing 1 to prevent dust from entering the outer end of the worm coil spring 7. Preferably, the dust cover 13 is installed by a snap-fit method. The outer side of the housing 1 is provided with left and right slots on both sides of the end through which the worm coil spring 7 passes, and a corresponding clip is provided inside the dust cover 13. A dustproof retaining ring 14 is clamped between the lower end of the swing arm 3 and the upper end of the housing 1. The corresponding ring body is located on the outside, and the horizontal part connected to the ring body is clamped between the swing arm 3 and the housing 1. The dustproof retaining ring 14 provides a dustproof function between the swing arm 3 and the housing 1 to prevent dust from entering the interior of the housing 1.
[0015] As a further improved specific implementation, referring to Figure 3, a disc spring 15, a steel plate 16 and a nylon plate 17 are sequentially provided between the upper end of the swing arm 3 and the lower end of the riveting plate 8. The riveting plate 8 generates damping through the pressure of the disc spring 15. The pressure of the disc spring 15 also acts on the swing arm 3, so that the swing arm 3 and the housing 1 clamp the dustproof ring 14. Even when the dustproof ring 14 is worn, the clamping state can still be guaranteed.
[0016] As a further improved specific implementation, referring to Figure 3, the pulley 4 includes a wheel body 18, a bearing 19 and a bolt 20. Both ends of the bearing 19 are equipped with dustproof baffles 21, which are fixed by bolts 20. The bolts 20 pass through the center hole of the bearing 19 and are fixed to the swing arm 3. The inner edge of the dustproof baffle 21 extends into the center hole of the bearing 19, and the inner ring of the dustproof baffle 21 fits against the end face of the bearing 19. The outer edge of the dustproof baffle 21 is a labyrinth-shaped dustproof flange structure, with the flange direction facing the bearing 19.
[0017] As a further improved specific implementation, the rubber edging 10, the first sealing ring 11 and the second sealing ring 12 are made of fluororubber, which is resistant to high temperature and has good durability.
[0018] 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 fully sealed dustproof tensioning wheel, comprising a housing, a shaft, a swing arm, and a pulley, wherein the shaft is disposed within the housing, a rotating cylinder is provided at one end of the swing arm, the rotating cylinder is rotatably mounted on the shaft, a central sleeve is provided between the rotating cylinder and the shaft, a worm gear spring is provided between the rotating cylinder and the housing, a riveting plate is provided at the upper end of the shaft, and the pulley is disposed at the other end of the swing arm, characterized in that: The outer edge of the riveting plate is provided with an annular protrusion on the swing arm, and the outer edge of the riveting plate is provided with a rubber edging. The rubber edging and the annular protrusion are sealed together. A first sealing ring is provided between the upper end of the rotating cylinder and the riveting plate, and a second sealing ring is provided between the lower end of the rotating cylinder and the housing. The inner end of the worm coil spring is hooked on the rotating cylinder, and the outer end of the worm coil spring passes through the housing. A dust cover is provided on the outer side of the corresponding housing. A dustproof retaining ring is sandwiched between the lower end of the swing arm and the upper end of the housing, and the corresponding ring is located on the outer side.
2. The totally enclosed dust-proof tensioning wheel according to claim 1, characterized in that: A disc spring, a steel plate, and a nylon plate are sequentially arranged between the upper end of the swing arm and the lower end of the riveting plate. The riveting plate generates damping through the pressure of the disc spring.
3. The totally enclosed dustproof tensioning pulley as set forth in claim 1, wherein: The pulley includes a wheel body, a bearing, and bolts. Dustproof baffles are provided at both ends of the bearing. The dustproof baffle ring is fixed by bolts. The inner edge of the dustproof baffle extends into the center hole of the bearing. The inner ring of the dustproof baffle fits against the end face of the bearing. The outer edge of the dustproof baffle has a labyrinth-shaped dustproof flange structure.
4. The fully sealed dustproof tensioning wheel as described in claim 1, characterized in that: The rubber edging, the first sealing ring, and the second sealing ring are made of fluororubber.