Lightweight crankset

Abstract

The utility model relates to a light-weight crankset which comprises an outer ring gear ring and an inner ring butt-joint disc, the outer ring gear ring and the inner ring butt-joint disc are connected in a fastened mode through a locking piece, a butt-joint groove is formed in the outer ring gear ring, a butt-joint part matched with the butt-joint groove is arranged on the inner ring butt-joint disc, and the outer ring gear ring and the inner ring butt-joint disc are attached through the butt-joint part and the butt-joint groove. And the contact area of the outer ring gear ring and the inner ring butt joint disc is increased. According to the scheme, a traditional integrated crankset is optimized, the outer ring gear ring made of metal is matched with the light-weight inner ring butt joint disc to be combined, the combined crankset is formed, the strength of the butt joint position of the traditional crankset and a chain is reserved, the overall mass of the crankset is reduced, and the service life of a product is not affected while the light weight is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a bicycle accessory, in particular to a light weight sprocket. BACKGROUND

[0002] The sprocket is the part connecting the axle and the crank of the bicycle. People drive the crank by pedaling, and then drive the rotation of the sprocket, finally drive the rotation of the rear wheel through the chain and the freewheel, provide power, complete the whole transmission chain of the bicycle.

[0003] The existing sprocket is integrally formed, which is single aluminum material and integrally processed. The product is durable and simple to process, but the product weight is large and cannot achieve the ultimate light weight. The existing authorized Chinese patent document CN206336388U discloses a mountain bike tooth piece light weight sprocket, which adopts a plastic coating layer to cover the thin teeth to form thick teeth, so that the product weight is reduced. Although it has a light weight effect to a certain extent, the plastic coated gear is easy to wear, and the wear will affect the transmission of the chain. Regular replacement also needs to check the individual gear, so that the replacement cycle is frequent, and the replacement time is long. SUMMARY

[0004] The utility model aims at providing a light weight sprocket to solve the problems of large overall weight of the existing sprocket and easy wear at the joint with the chain.

[0005] In order to achieve the above purpose, the utility model provides the following technical scheme:

[0006] A light weight sprocket, comprising an outer ring gear and an inner ring joint disc, the outer ring gear and the inner ring joint disc are fastened and connected through a locking part, a joint groove is formed on the outer ring gear, and a joint part matched with the joint groove is arranged on the inner ring joint disc. The joint part and the joint groove are matched to increase the contact area of the outer ring gear and the inner ring joint disc.

[0007] Preferably, the outer ring gear is made of aluminum alloy material, and the inner ring joint disc is made of carbon fiber material.

[0008] Preferably, the joint groove is a tooth-shaped groove, and the joint part is matched with the joint groove.

[0009] Preferably, the locking part comprises a plug column and a fastening cap, and the outer ring gear, the inner ring joint disc and the fastening cap are all provided with a joint hole for inserting the plug column.

[0010] Preferably, the fastening cap comprises a circular cap and an upper chain nail, and the circular cap and the upper chain nail are both made of titanium alloy.

[0011] Preferably, the inner ring joint disc is provided with a hollow opening and a groove accommodating the fastening cap.

[0012] Preferably, the small tooth ring and the butt joint ring are provided with locking holes for fixing rivets, and the butt joint ring and the inner ring butt joint disc are provided with through holes for fixing screws.

[0013] Preferably, the small tooth ring is provided with a fitting groove, and the butt joint ring is provided with a fitting part matched with the fitting groove.

[0014] Preferably, the small tooth ring is provided with a chamfer matched with the rivet at the corresponding locking hole, and the butt joint ring is provided with a receiving hole matched with the rivet.

[0015] Preferably, the small tooth ring is made of aluminum alloy material, and the butt joint ring is made of carbon fiber material.

[0016] Compared with the prior art, the utility model has the beneficial effects that:

[0017] 1. The scheme optimizes the traditional integrated tooth disc, and the outer ring tooth ring made of metal material is combined with the light-weight inner ring butt joint disc to form a combined tooth disc, so that the strength of the traditional tooth disc and the chain butt joint part is retained, and the overall quality of the tooth disc is reduced, the service life of the product is not affected while achieving light weight.

[0018] 2. In the scheme, the tooth disc is designed in a split type, the outer ring tooth ring is made of aluminum alloy material, the period of wear of the outer tooth can be effectively prolonged, even if wear occurs, only the outer ring tooth ring needs to be directly replaced, a single tooth does not need to be detected, and frequent maintenance and replacement are not needed, so that the working hours consumed for replacement are shortened. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a whole structure schematic view of the utility model.

[0020] Figure 2 It is a whole front view of the utility model.

[0021] Figure 3 It is another angle structure schematic view of the whole utility model.

[0022] Figure 4 It is a whole expansion schematic view of the utility model.

[0023] Figure 5 It is a butt joint schematic view of the small tooth ring and the inner ring butt joint disc of the utility model.

[0024] Figure 6 It is an expansion schematic view of the small tooth ring and the butt joint ring of the utility model.

[0025] Figure 7This is a schematic diagram showing the small toothed ring and the docking ring of this utility model from another angle.

[0026] The components represented by each number in the attached diagram are listed below: 1. Outer toothed ring; 2. Inner mating disc; 3. Mating hole; 4. Locking element; 5. Mating groove; 6. Mating part; 7. Insert post; 8. Fastening cap; 9. Upper chain pin; 10. Hollowed-out opening; 11. Groove; 12. Small toothed ring; 13. Mating ring; 14. Locking hole; 15. Rivet; 16. Through opening; 17. Fitting groove; 18. Fitting part; 19. Storage opening; 20. Round ring cap. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0028] like Figure 1 - Figure 4 As shown in the figure, a lightweight crankset includes an outer gear ring 1 and an inner mating plate 2. The outer gear ring 1 and the inner mating plate 2 are fastened together. The outer gear ring 1 has a mating groove 5, and the inner mating plate 2 has a mating part 6 that matches the mating groove 5. The mating part 6 fits into the mating groove 5, increasing the contact area between the outer gear ring 1 and the inner mating plate 2.

[0029] Among them, the outer ring toothed ring 1 and the inner ring mating plate 2 are provided with mating holes 3, and the outer ring toothed ring 1 and the inner ring mating plate 2 are mated by locking parts 4.

[0030] Specifically: The outer ring toothed ring 1, made of metal, is connected to the chain, ensuring long-term wear resistance and extending product lifespan. The locking element 4 connects the outer ring toothed ring 1 to the inner ring connecting plate 2, forming a complete crankset. The inner ring connecting plate 2 uses lightweight materials, further reducing the overall weight of the crankset. The designed connecting part 6 and connecting groove 5 fit together tightly, increasing the contact area. To further enhance the overall connection effect, adhesive can be applied to the joint to improve its strength.

[0031] It should also be noted that, in order to improve the docking strength between the docking groove 5 and the docking part 6, the docking groove 5 is designed as a toothed groove, and the docking part 6 is adapted to the toothed groove.

[0032] Furthermore, the locking component 4 includes a pin 7 and a fastening cap 8. The outer ring toothed ring 1, the inner ring mating disc 2, and the fastening cap 8 are all provided with mating holes 3 for the pin 7 to insert into. After the outer ring toothed ring 1 mates with the inner ring mating disc 2, the pin 7 is inserted into the mating hole 3, and then secured with the fastening cap 8 to achieve fixation between the outer ring toothed ring 1 and the inner ring mating disc 2. The fastening cap 8 includes a circular cap 20 and an upper chain pin 9, which improves the chain winding efficiency.

[0033] In addition, the ring cap 20 and the upper chain pin 9 can also be installed by riveting.

[0034] Preferably, the outer toothed ring 1 is made of aluminum alloy, the inner connecting plate 2 is made of carbon fiber, and the insert 7, the ring cap 20, and the upper chain pin 9 are all made of titanium alloy. The outer toothed ring 1 made of aluminum alloy is not only lightweight but also has high strength, and is not easily worn when connected to the chain for transmission. The inner connecting plate 2 made of carbon fiber also has a good lightweight effect, reducing the overall weight.

[0035] In this design, to further reduce the overall weight, a hollow opening 10 is provided on the inner ring connecting plate 2. At the same time, a matching groove 11 is designed on the inner ring connecting plate 2 at the position corresponding to the fastening cap 8, so that the fastening cap 8 is more compact after installation and saves space.

[0036] During installation, first align the mating part 6 on the inner ring mating plate 2 with the mating groove 5, and simultaneously insert the mating hole 3 into the insert 7. Then, fix the ring cap 20 to initially secure the inner ring mating plate 2 and the outer ring toothed ring 1. After that, install the chain pin 9 to complete the assembly of the entire crankset. Alternatively, you can apply glue between the mating part 6 and the mating groove 5 to further ensure the bonding strength.

[0037] like Figure 5 - Figure 7 As shown, this is one embodiment of a variable-speed chainring. This embodiment also includes a pinion ring 12 and a connecting ring 13. The pinion ring 12 connects with the chain to achieve a speed-changing effect. Both the pinion ring 12 and the connecting ring 13 have locking holes 14 and are fixed by rivets 15. The connecting ring 13 and the inner ring connecting disc 2 both have matching through-holes 16 and are fixed by screws.

[0038] In order to improve the docking strength between the small toothed ring 12 and the docking ring 13, a fitting groove 17 is provided on the small toothed ring 12, and a fitting part 18 that matches the fitting groove 17 is fixed on the outside of the docking ring 13.

[0039] To reduce weight, the small toothed ring 12 is made of aluminum alloy, the mating ring 13 is made of carbon fiber, and the rivet 15 is made of titanium alloy.

[0040] In this embodiment, in order to improve the butt joint effect between the rivet 15 and the small tooth ring 12 and the butt joint ring 13, a chamfer matched with the rivet 15 is arranged at the locking hole 14 of the small tooth ring 12, and a receiving opening 19 matched with the rivet 15 is arranged on the butt joint ring 13.

[0041] In summary, the small tooth ring 12 and the butt joint ring 13 are fixed with the inner ring butt joint disc 2 after assembly, and the chain can achieve the speed changing effect after being butt jointed with the small tooth ring 12. Meanwhile, the small tooth ring 12 is made of aluminum alloy material, and the butt joint ring 13 is made of carbon fiber material, which can ensure the butt joint strength with the chain and reduce the overall weight.

[0042] In summary, the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A lightweight crankset, comprising an outer gear ring (1) and an inner mating disc (2), wherein the outer gear ring (1) and the inner mating disc (2) are fastened together by a locking member (4), characterized in that: The outer ring toothed ring (1) is provided with a mating groove (5), and the inner ring mating plate (2) is provided with a mating part (6) that is adapted to the mating groove (5). The mating part (6) fits into the mating groove (5), thereby increasing the contact area between the outer ring toothed ring (1) and the inner ring mating plate (2).

2. The lightweight dental crankset according to claim 1, characterized in that: The outer ring toothed ring (1) is made of aluminum alloy, and the inner ring mating plate (2) is made of carbon fiber.

3. A lightweight dental crankset according to claim 1, characterized in that: The docking groove (5) is a toothed groove, and the docking part (6) is adapted to the docking groove (5).

4. A lightweight dental crankset according to claim 1, characterized in that: The locking component (4) includes a pin (7) and a fastening cap (8). The outer ring toothed ring (1), the inner ring mating plate (2) and the fastening cap (8) are all provided with mating holes (3) for the pin (7) to be inserted.

5. A lightweight dental crankset according to claim 4, characterized in that: The fastening cap (8) includes a ring cap (20) and an upper chain pin (9), both of which are made of titanium alloy.

6. A lightweight crankset according to claim 5, characterized in that: The inner ring connecting plate (2) has a hollow opening (10) and a groove (11) for accommodating the fastening cap (8).

7. A lightweight dental crankset according to claim 1, characterized in that: It also includes a small toothed ring (12) and a mating ring (13), the small toothed ring (12) and the mating ring (13) having locking holes (14) for fixing rivets (15), and the mating ring (13) and the inner ring mating disc (2) having through holes (16) for fixing screws.

8. A lightweight crankset according to claim 7, characterized in that: The small toothed ring (12) has a fitting groove (17), and the mating ring (13) has a fitting part (18) that matches the fitting groove (17).

9. A lightweight dental crankset according to claim 7, characterized in that: The small toothed ring (12) has a chamfer at the locking hole (14) that matches the rivet (15), and the docking ring (13) has a storage opening (19) that matches the rivet (15).

10. A lightweight dental crankset according to claim 9, characterized in that: The small toothed ring (12) is made of aluminum alloy, and the docking ring (13) is made of carbon fiber.

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