A threaded variable speed flywheel in the side of a jack
By incorporating a freewheel jack with ratchet engagement at the end of the bicycle freewheel, combined with ball bearings and a locking ring design, the problems of low freewheel load capacity and unclear sound are solved, resulting in greater load capacity, a louder sound, and extended freewheel lifespan.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NINGBO KANGDI BICYCLE
- Filing Date
- 2025-08-05
- Publication Date
- 2026-08-04
AI Technical Summary
The jack of existing multi-stage bicycle freewheels is located in the middle of the freewheel, which results in low load-bearing capacity, unclear noise when spinning freely, and easy damage.
The jack is positioned at the end of the flywheel, and the evenly distributed jack base engages with the ratchet teeth. Combined with the ball bearing and locking ring design, the load is distributed and friction is reduced, thus enhancing the sound volume.
It improves the flywheel's load-bearing capacity and noise level during idling, extends the flywheel's service life, and reduces wear.
Smart Images
Figure CN224589308U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of bicycle equipment, and in particular to a threaded flywheel with a jack on the side. Background Technology
[0002] With increasingly advanced transportation, bicycles are becoming more of a recreational tool than a means of transportation, especially road bikes, which are fast and produce a ratcheting sound that enhances the enjoyment of riding.
[0003] Bicycle freewheels can be structurally divided into single-stage and multi-stage freewheels. In existing multi-stage freewheels, the chuck is generally located in the middle of the freewheel. The diameter of the chuck at this location is small, resulting in a lower load capacity and making the freewheel more susceptible to damage. Furthermore, the noise produced by the chuck and the casing when the freewheel is spinning is relatively quiet, making it difficult for the rider to hear clearly. Utility Model Content
[0004] To address the shortcomings of the existing technology, this utility model proposes a threaded variable speed flywheel with the jack positioned at the end of the flywheel, which allows the flywheel to bear greater tension and produces a louder sound when the flywheel is idling.
[0005] The technical solution of this utility model is implemented as follows: a threaded variable speed flywheel with a jack on the side includes a freehub base, the freehub base includes an inner core and an outer sleeve, the inner core is provided with a freehub base jack and a spring, the freehub base jack is rotatably mounted on the inner core, the inner sleeve is provided with ratchet teeth, the outer sleeve is provided with a flywheel body, the flywheel body includes multiple sets of spaced flywheels, the diameter of the multiple sets of flywheels is arranged from small to large, the freehub base jack is located at the flywheel with the largest diameter, the freehub base jack is used to mesh with the ratchet teeth.
[0006] In one embodiment, a washer is provided between adjacent flywheels. The washer prevents fine debris from entering between the flywheels, reducing wear between them.
[0007] In one embodiment, the inner core and outer casing are sealed by a cover plate located away from the flywheel with the largest diameter.
[0008] In one embodiment, a ring of ball bearings is arranged at the contact point between the cover plate and the outer sleeve, and another ring of ball bearings is arranged between the inner core and the outer sleeve. The ball bearings act as bearings, converting sliding friction into rolling friction by rolling on the track, greatly reducing rotational resistance. This allows the tower base (along with the flywheel) to rotate smoothly when gliding or backpedaling.
[0009] In one embodiment, the outer casing has a locking ring at its end, located away from the largest diameter freewheel. The locking ring is screwed onto the outermost thread of the freewheel base, pressing the entire freewheel body firmly against the shoulder or washer inside the freewheel base, thereby preventing axial movement or loosening of the freewheel body during riding (especially during bumps, shifting, or backward pedaling). The tightening force applied by the locking ring is transmitted through the outermost freewheel to each of the inner freewheels.
[0010] In one embodiment, multiple flywheel base jacks are distributed circumferentially along the inner core, with equal included angles between any two adjacent flywheel base jacks. This uniform distribution of multiple flywheel base jacks allows the impact force to be distributed across multiple points simultaneously, rather than concentrated on one or two points. This load-sharing significantly reduces the shear and impact forces borne by each flywheel base jack and its meshing ratchet, making the flywheel base jacks and ratchet less prone to cracking, wear, or plastic deformation, thereby greatly extending the overall service life of the flywheel.
[0011] In one embodiment, the spring corresponds one-to-one with the tower base jack. When the flywheel rotates forward, the spring pops out to engage the tower base jack with the ratchet. When the flywheel rotates in reverse, the spring compresses to disengage the tower base jack from the ratchet.
[0012] In one embodiment, the inner core is connected to a drive shaft for transmitting torque.
[0013] In one embodiment, the tower base jack has three protrusions near the outer edge of the ratchet, which engage with the ratchet.
[0014] This invention, by placing the base jack at the flywheel with the largest diameter, enables the flywheel to bear greater tension. In the sliding / reverse-stepping state, as the flywheel spins freely, the base jack, driven by the spring inside the base, continuously slides over and strikes the fixed ratchet, producing a crisper and louder impact sound. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of this utility model;
[0016] Figure 2 for Figure 1 Sectional view at point AA;
[0017] Figure 3 for Figure 2 Enlarged schematic diagram of the structure at point A in the middle;
[0018] Figure 4 This is a front view of the flywheel body of this utility model.
[0019] In the diagram, 1. Inner core, 2. Outer casing, 3. Tower base jack, 4. Spring, 5. Ratchet, 6. Flywheel, 7. Washer, 8. Cover plate, 9. Ball bearing, 10. Locking ring, 11. Protrusion. Detailed Implementation
[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0021] It should be noted that when a component is said to be "attached" to another component, it can be directly on the other component or it can be in the middle of another component. When a component is said to be "set" to another component, it can be directly set to the other component or it may also be in the middle of another component. When a component is said to be "fixed" to another component, it can be directly fixed to the other component or it may also be in the middle of another component.
[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.
[0023] like Figures 1 to 4 As shown, this embodiment discloses a threaded variable speed flywheel with a jack on the side, including a freehub base. The freehub base includes an inner core 1 and an outer sleeve 2. The inner core 1 is provided with a freehub base jack 3 and a spring 4. The freehub base jack 3 is rotatably mounted on the inner core 1. The outer sleeve 2 is provided with ratchet teeth 5. The outer sleeve 2 is provided with a flywheel body. The flywheel body includes 7 sets of flywheels 6 spaced apart. The 7 sets of flywheels 6 can be divided into 14T, 16T, 18T, 20T, 22T, 24T and 28T according to the number of teeth. Among them, the 14T flywheel has the smallest diameter and the 28T flywheel has the largest diameter.
[0024] The flywheels 6 in the seven groups are arranged in ascending order of diameter. The base jack 3 is set at the flywheel with the largest diameter (28T). The base jack 3 is used to engage with the ratchet 5. By setting the base jack 3 at the flywheel with the largest diameter, the flywheel body can bear a greater pulling force.
[0025] In this embodiment, a washer 7 is provided between adjacent flywheels 6. The washer 7 can prevent fine debris from entering between the flywheels 6 and reduce wear between the flywheels 6.
[0026] In this embodiment, the inner core 1 and the outer casing 2 are sealed by a cover plate 8, which is located away from the flywheel with the largest diameter.
[0027] In this embodiment, a ring of ball bearings 9 is arranged at the contact point between the cover plate 8 and the outer sleeve 2, and another ring of ball bearings 9 is arranged between the inner core 1 and the outer sleeve 2. The ball bearings 9 act as bearings, and by rolling on the track, they convert sliding friction into rolling friction, greatly reducing rotational resistance. This allows the tower base (along with the flywheel) to rotate smoothly when gliding or stepping backward.
[0028] In this embodiment, the end of the outer casing 2 is provided with a locking ring 10, which is located away from the largest diameter freewheel (i.e., at the 14T freewheel). The locking ring 10 is screwed onto the outermost thread of the freewheel base, pressing the entire freewheel body tightly against the shoulder or washer inside the freewheel base, thereby preventing the freewheel body from axially moving or loosening during riding (especially when riding on bumps, shifting gears, or pedaling backwards). The tightening force applied by the locking ring is transmitted through the outermost freewheel to each of the inner freewheels.
[0029] In this embodiment, there are six flywheel base jacks 6, which are distributed circumferentially along the inner core 1, with equal included angles between any two adjacent flywheel base jacks 3. The uniform distribution of the flywheel base jacks 3 allows the impact force to be distributed across multiple points simultaneously, rather than concentrated on one or two points. This distributed load significantly reduces the shear and impact forces borne by each flywheel base jack 3 and its meshing ratchet 5. This makes the flywheel base jacks 3 and ratchet 5 less prone to cracking, wear, or plastic deformation, thereby greatly extending the service life of the entire flywheel.
[0030] In this embodiment, the number and position of the spring pieces 4 correspond one-to-one with the base jacks 3. When the flywheel 6 rotates clockwise, the spring pieces 4 pop out to engage the base jacks 3 with the ratchet teeth 5. When the flywheel 6 rotates counterclockwise, the spring pieces 4 compress to disengage the base jacks 3 from the ratchet teeth 5. In the sliding / reverse-stepping state, the base jacks 3 driven by the spring pieces 4 inside the inner core 1 continuously slide over and strike the fixed ratchet teeth as the flywheel spins freely, producing a crisper and louder impact sound.
[0031] In this embodiment, the inner core 1 is connected to the drive shaft to transmit torque.
[0032] In this embodiment, the tower base jack 3 has three protrusions 11 near the outer edge of the ratchet 5, and the protrusions 11 engage with the ratchet 5. The above is only a preferred embodiment of this utility model and is not intended to limit this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A threaded variable speed flywheel with a jack on the side, comprising a freewheel base, characterized in that: The base includes an inner core and an outer sleeve. The inner core is provided with a base jack and a spring. The base jack is rotatably mounted on the inner core. The outer sleeve has ratchet teeth inside and a flywheel body on the outer sleeve. The flywheel body includes multiple sets of flywheels distributed at intervals. The diameters of the multiple sets of flywheels are arranged from small to large. The base jack is located at the flywheel with the largest diameter and is used to engage with the ratchet teeth.
2. The threaded variable speed flywheel with the jack on the side as described in claim 1, characterized in that: Washers are provided between adjacent flywheels.
3. The threaded variable speed flywheel with the jack on the side as described in claim 1, characterized in that: The inner core and outer casing are sealed by a cover plate located away from the flywheel with the largest diameter.
4. The threaded variable speed flywheel with the jack on the side as described in claim 3, characterized in that: A ring of ball bearings is provided at the contact point between the cover plate and the outer sleeve, and a ring of ball bearings is provided between the inner core and the outer sleeve.
5. The threaded variable speed flywheel with the jack on the side as described in claim 1, characterized in that: The end of the outer casing is provided with a locking ring, which is located away from the flywheel with the largest diameter.
6. The threaded variable speed flywheel with the jack on the side as described in claim 1, characterized in that: Multiple tower base jacks are distributed circumferentially along the inner core, and the included angle between any two adjacent tower base jacks is equal.
7. The threaded variable speed flywheel with the jack on the side as described in claim 1, characterized in that: The spring clips correspond one-to-one with the base jacks. When the flywheel rotates clockwise, the spring clips pop out to engage the base jacks with the ratchet teeth. When the flywheel rotates counterclockwise, the spring clips compress to disengage the base jacks from the ratchet teeth.
8. The threaded variable speed flywheel with the jack on the side as described in claim 1, characterized in that: The inner core is connected to the drive shaft to transmit torque.
9. The threaded variable speed flywheel with the jack on the side as described in claim 1, characterized in that: The tower base jack has three protrusions near the outer edge of the ratchet, and the protrusions engage with the ratchet.