CN217575506U

CN217575506U - Chain wheel mechanism of bicycle

Info

Publication number: CN217575506U
Application number: CN202221624853.9U
Authority: CN
Inventors: 郑宇轩; 王启丞
Original assignee: Huizhou Yuansheng Bicycle Parts Co ltd
Current assignee: Huizhou Yuansheng Bicycle Parts Co ltd
Priority date: 2022-06-27
Filing date: 2022-06-27
Publication date: 2022-10-14
Anticipated expiration: 2032-06-27

Abstract

The utility model discloses a bicycle sprocket mechanism, a ratchet seat is located to its confession, and this bicycle sprocket mechanism includes: a chain wheel set, which is sleeved on the ratchet seat and sleeved on the ratchet seat towards a group connection direction; a locking ring, which is arranged on the ratchet wheel seat in a rotating way and is used for pressing the chain wheel set in a rotating way; the protection unit is sleeved on the ratchet seat and comprises an extension part and a protection disc part, the length of the extension part in the assembling direction is more than or equal to 3mm, the extension part is sleeved on the ratchet seat, and the protection disc part is sleeved on the ratchet seat; wherein, the locking ring, the chain wheel group, the protection disc part and the extension part are arranged in sequence in the assembling direction.

Description

Chain wheel mechanism of bicycle

Technical Field

The utility model relates to a bicycle sprocket mechanism.

Background

A speed-changing system of bicycle features that the speed variator is used to drive chain to move between toothed disks in different sizes for changing its pedaling efficiency, so allowing the rider to ride on different road segments (uphill, downhill, or other road conditions). However, the chain may drop in a state where the transmission is not properly adjusted.

The conventional bicycle steel wire protection disc structure is, for example, taiwan patent 380581, in which a plurality of traction holes on the protection disc and a plurality of traction parts on the chain wheel set are engaged with each other, so that the protection disc is disposed on the shaft tube of the hub. However, the protection disc and the flywheel set need to be provided with a structure matching with each other, so that the protection disc is fixed on the shaft tube of the hub, which results in a complicated structural design, and a gap is formed between the protection disc and a flange on the hub, which is provided with spokes, so that the protection disc is easy to move relative to the shaft tube of the hub.

Therefore, there is a need for a new and improved bicycle chain wheel mechanism that solves the above-mentioned problems.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide a bicycle sprocket assembly, which prevents a chain from being separated from a sprocket assembly with a simple structure, and is suitable for a beginner with less types of variable speeds, and a child who wants to slowly increase the types of other sprockets during growth.

To achieve the above object, the present invention provides a bicycle sprocket mechanism, which is provided to a ratchet seat, the bicycle sprocket mechanism comprising: a chain wheel set, which is sleeved on the ratchet seat and sleeved on the ratchet seat towards a group connection direction; a locking ring, which is arranged on the ratchet wheel seat in a rotating way and is used for pressing the chain wheel set in a rotating way; the protection unit is sleeved on the ratchet seat and comprises an extension part and a protection disc part, the extension part is sleeved on the ratchet seat, and the protection disc part is sleeved on the ratchet seat; wherein, the locking ring, the chain wheel set, the protection disc part and the extension part are arranged in sequence in the assembling direction.

Preferably, the extension portion is a sleeve, the protection disk portion is a disk-shaped disk, and the sleeve is disposed on the ratchet seat.

Preferably, at least a portion of the extension portion is closer to a central plane of a bicycle frame than the protective disk portion.

Preferably, the protection disc portion is adjacent to the sprocket set, and the protection disc portion is provided with an abutting surface in the assembling direction, and the abutting surface is adjacent to the sprocket set.

Preferably, the locking ring drives the protection disk portion and the extension portion to move in a same direction.

Preferably, the locking ring is rotatable to a loosening position, and when the locking ring is located at the loosening position, the protective disc portion is rotatable relative to the ratchet seat.

Preferably, the sleeve and the ratchet seat are movable independently.

Preferably, the locking ring is rotatable to a tightening position, and the sleeve and the ratchet seat are in the same rotational relationship when the locking ring is in the tightening position.

Preferably, the protection disk part and the extension part are connected to each other by integral molding.

Preferably, at least a portion of the extension portion is closer to a central plane of a bicycle frame than the protective disk portion; the locking ring can drive the protective disc part and the extension part to be in a synchronous relationship; the locking ring can rotate to an unscrewing position and a screwing position, and when the locking ring is positioned at the unscrewing position, the protective disc part can rotate relative to the ratchet wheel seat; when the locking ring is at the screwing position, the sleeve barrel and the ratchet seat are in the same rotation relation; the sleeve comprises a large-diameter section, a small-diameter section and a first shoulder part, the first shoulder part is formed between the large-diameter section and the small-diameter section, the protective disc part is provided with a shaft hole, the shaft hole comprises a large-diameter hole, a small-diameter hole and a second shoulder part, the large-diameter hole is sleeved on the large-diameter section, the small-diameter hole is sleeved on the small-diameter section, and the first shoulder part and the second shoulder part are mutually attached in the assembling direction; the locking ring comprises a screw connection section and a clamping protrusion, the screw connection section is in screw connection with a screw thread section of the ratchet seat, and the clamping protrusion extends in the radial direction and is clamped against the chain wheel set towards the assembling direction; the large-diameter section is used for abutting against a radial convex abutting part of the ratchet seat towards the assembling direction.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings required to be used in the description of the embodiments or the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a perspective view of a first preferred embodiment of the present invention.

Fig. 2 is an exploded view of a first preferred embodiment of the present invention.

Fig. 3 is a cross-sectional view of a locking ring in a tightened position according to a first preferred embodiment of the present invention.

Fig. 4 is a cross-sectional view of a locking ring in a unscrewed position according to a first preferred embodiment of the present invention.

Fig. 5 is a schematic view of a first preferred embodiment of the present invention.

Fig. 6 is another schematic diagram of a first preferred embodiment of the present invention.

Fig. 7 is a cross-sectional view of a second preferred embodiment of the present invention.

Wherein, 1, the bicycle chain wheel mechanism; 10, a chain wheel set; 20, locking ring; 21, a screw joint section; 22, clamping convex; 30,30' a protection unit; 31, an extension part; 311, a large-diameter section; 312, a small-diameter section; 313: a first shoulder; 32, protecting the disc part; 33, an abutting surface; 34, an axle hole; 341 big diameter hole; 342, small-diameter holes; 343, a second shoulder; 2, ratchet wheel seat; 3, a bicycle frame; 4, a central plane; 5, thread section; 6, abutting part; 7, a wheel body; 8, the assembling direction; l1 is the length dimension.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The terms "a" or "an" or "at least one" used in the following embodiments are not intended to limit the quantity, which may be "a plurality" or "a plurality" depending on the requirement, and the quantity is not limited to the range to be protected.

Referring to fig. 1 to 6, it shows a first preferred embodiment of the present invention, a bicycle sprocket mechanism 1 of the present invention, which is provided to be disposed on a ratchet seat 2, the bicycle sprocket mechanism 1 includes: a sprocket assembly 10, a lock ring 20 and a guard unit 30.

The sprocket assembly 10 is provided for being sleeved on the ratchet seat 2, and the sprocket assembly 10 is sleeved on the ratchet seat 2 in a assembling direction 8; the locking ring 20 is screwed on the ratchet seat 2, and the locking ring 20 rotates to press the chain wheel set 10; the protection unit 30 is provided to be sleeved on the ratchet seat 2, the protection unit 30 includes an extension portion 31 and a protection disc portion 32, the extension portion 31 is provided to be sleeved on the ratchet seat 2, and the protection disc portion 32 is provided to be sleeved on the ratchet seat 2; wherein, the locking ring 20, the sprocket assembly 10, the protecting disc portion 32 and the extending portion 31 are sequentially arranged in the assembling direction 8. In this embodiment, at least a portion of the extension 31 is closer to a central plane 4 of a bicycle frame 3 than the protective disk portion. Accordingly, the chain is prevented from being separated from the sprocket assembly 10 (e.g., but not limited to, during shifting) with a simple structure, and the protective disc portion 32 can be stably held in place (away from the wheel body 7) for a wheel body 7 while preventing the chain from falling into the inner side and the ratchet seat slot and interfering with at least one spoke of the wheel body 7.

In this embodiment, the extension portion 31 is a sleeve, the protection disk portion 32 is a disc-shaped disk, the sleeve is sleeved on the ratchet seat 2, that is, the extension portion 31 and the protection disk portion 32 are independent elements, the protection unit 30 is a two-piece assembly structure, so that the protection disk portion 32 and the extension portion 31 can be made of different materials or the same material, and the extension portions 31 with different sizes can be selected according to requirements. The extension 31 may be made of metal, with good structural strength, or non-metal. The protection disk portion 32 is made of a non-metal material (e.g., plastic material). In this embodiment, the sleeve and the ratchet seat 2 are movable.

The length L1 of the extension portion 31 in the assembling direction 8 is greater than or equal to 3mm, so that the protection disk portion 32 keeps a proper distance from the wheel body 7, and simultaneously, the chain is prevented from falling into the inner side and the ratchet seat slot and interfering with the at least one spoke of the wheel body 7.

The protective disk part 32 is adjacent to the sprocket set 10, the protective disk part 32 is provided with an abutting surface 33 in the assembling direction 8, and the abutting surface 33 is adjacent to the sprocket set 10; in the present embodiment, the abutting surface 33 abuts against the sprocket set 10 in the assembling direction 8. The locking ring 20 is rotatably positioned between an unscrewed position and a screwed position, and when the locking ring 20 is in the unscrewed position, the protective disc portion 32 can rotate relative to the ratchet seat 2. Preferably, the locking ring 20 drives the protection disk portion 32 and the extension portion 31 to move in the same direction; specifically, the locking ring 20 is rotatably positioned in the tightening position and the sleeve is in co-rotational relationship with the ratchet seat 2. In the embodiment, the locking ring 20 includes a threaded section 21 and a locking protrusion 22, the threaded section 21 is threaded to a threaded section 5 (such as but not limited to a threaded hole) of the ratchet seat 2, and the locking protrusion 22 extends radially and is engaged with the sprocket set 10 in the assembling direction 8. Accordingly, the locking ring 20 can be selectively rotated to the tightening position to force the sprocket set 10, the protecting disc portion 32, the extending portion 31 and the ratchet seat 2 to move together in the assembling direction 8, or the locking ring 20 can be rotated to move the protecting unit 30 and the ratchet seat 2 differently.

The sleeve includes a large diameter section 311, a small diameter section 312 and a first shoulder 313, the first shoulder 313 is formed between the large diameter section 311 and the small diameter section 312, the protection disc part 32 is provided with a shaft hole 34, the shaft hole 34 includes a large diameter hole 341, a small diameter hole 342 and a second shoulder 343, the large diameter hole 341 is sleeved on the large diameter section 311, the small diameter hole 342 is sleeved on the small diameter section 312, and the first shoulder 313 and the second shoulder 343 are mutually abutted in the assembling direction 8. Specifically, the large diameter section 311 is provided for being clamped against a radially protruding abutting portion 6 of the ratchet seat 2 in the assembling direction 8. Therefore, the protection disk part 32 is stopped from approaching the wheel body 7 in the assembling direction 8, so that the protection disk part 32 is provided for holding the wheel body 7 at a proper position, and the extension part 31, the protection disk part 32 and the sprocket wheel group 10 can be clamped by the locking ring 20 and the abutting part 6 of the ratchet seat 2 to move together.

To further explain, the size of the sleeve can be changed according to the tooth plate speed of the chain wheel set 10 or the size of the ratchet wheel seat 2 selected by a user, for example, the length of the sleeve matched with the 6-speed tooth plate for installing the chain wheel set is 3mm; the length of the sleeve matched with the 5-speed tooth piece for mounting the chain wheel set is 8mm; but is not limited thereto.

Referring to fig. 7, it shows a second preferred embodiment of the present invention, the protection disk portion 32 and the extension portion 31 of the protection unit 30' are integrally formed and connected to each other, such as by integral injection molding, to simplify the parts and the installation steps, and the protection disk portion 32 and the extension portion 31 will not move relatively. In addition, the protective disk portion 32 of the extension 31 having a desired size can also be replaced according to the blade selected by the user.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications or substitutions do not depart from the scope of the invention in its corresponding aspects.

Claims

1. The utility model provides a bicycle sprocket mechanism, its confession is located a ratchet seat, its characterized in that, this bicycle sprocket mechanism includes:

the chain wheel group is sleeved on the ratchet wheel seat and sleeved on the ratchet wheel seat in a group connection direction;

a locking ring for being rotatably arranged on the ratchet wheel seat, wherein the locking ring is used for rotating to force the chain wheel set; and

the protection unit is sleeved on the ratchet seat and comprises an extension part and a protection disc part, the length of the extension part in the assembling direction is more than or equal to 3mm, the extension part is sleeved on the ratchet seat, and the protection disc part is sleeved on the ratchet seat;

wherein, the locking ring, the chain wheel set, the protection disc part and the extension part are arranged in sequence in the assembling direction.

2. The bicycle sprocket mechanism as set forth in claim 1, wherein the extension is a sleeve, the protective disk portion is a disc-shaped disk, and the sleeve is configured to be received by the ratchet seat.

3. The bicycle sprocket mechanism according to claim 1, wherein at least a portion of the extension is located closer to a center plane of a bicycle frame than the protective disk portion.

4. The bicycle sprocket mechanism according to claim 1, wherein the protective disc portion is adjacent to the sprocket set, the protective disc portion having an abutment surface in the mounting direction, the abutment surface being adjacent to the sprocket set.

5. The bicycle sprocket mechanism according to claim 1, wherein the locking ring drives the protective disc portion and the extension portion in a co-dynamic relationship.

6. The bicycle sprocket mechanism according to claim 1, wherein the locking ring is rotatable to a release position, and the protective disc portion is rotatable relative to the ratchet seat when the locking ring is in the release position.

7. The bicycle sprocket gear according to claim 2, wherein the socket and the ratchet seat are independently movable.

8. The bicycle chain wheel mechanism according to claim 2, wherein the locking ring is rotatable to an tightened position, and the sleeve is in co-rotational relationship with the ratchet seat when the locking ring is in the tightened position.

9. The bicycle sprocket mechanism according to claim 1, wherein the protective disc portion and the extension portion are integrally connected to each other.

10. The bicycle sprocket mechanism according to claim 2, wherein at least a portion of the extension portion is closer to a center plane of a bicycle frame than the protective disc portion; the locking ring can drive the protective disc part and the extension part to be in the same-motion relationship; the locking ring can rotate to a loosening position and a tightening position, and when the locking ring is positioned at the loosening position, the protective disc part can rotate relative to the ratchet wheel seat; when the locking ring is at the screwing position, the sleeve barrel and the ratchet seat are in the same rotating relation; the sleeve comprises a large-diameter section, a small-diameter section and a first shoulder part, the first shoulder part is formed between the large-diameter section and the small-diameter section, the protective disc part is provided with a shaft hole, the shaft hole comprises a large-diameter hole, a small-diameter hole and a second shoulder part, the large-diameter hole is sleeved on the large-diameter section, the small-diameter hole is sleeved on the small-diameter section, and the first shoulder part and the second shoulder part are mutually attached in the assembling direction; the locking ring comprises a screw connection section and a clamping protrusion, the screw connection section is in screw connection with a screw thread section of the ratchet seat, and the clamping protrusion extends in the radial direction and is clamped against the chain wheel set towards the assembling direction; the large-diameter section is used for abutting against a radial convex abutting part of the ratchet seat towards the assembling direction.