Child bicycle suitable for small-specification transmission system

Abstract

The utility model relates to a child bicycle suitable for a small-specification transmission system, which comprises a front fluted disc fixed on a middle shaft at the middle lower part of a bicycle body, a rear flywheel fixed on a rear wheel and a transmission chain connected with the front fluted disc and the rear flywheel, the gear ratio of the front fluted disc to the rear flywheel is 1.2-2, and when the size of the bicycle body is 14 inches, the transmission chain is connected with the front fluted disc and the rear flywheel. The gear ratio of the transmission system is 1.2-1.5 when the size of the vehicle body is 16 inches, the gear ratio of the transmission system is 1.5-1.8 when the size of the vehicle body is 16 inches, and the gear ratio of the transmission system is 1.8-2 when the size of the vehicle body is 18 inches. A smaller gear ratio is designed for a transmission system of the baby carriage, when a child rides the baby carriage, the baby carriage can be started with small strength, riding is easier and more labor-saving, different gear ratios are designed for the carriage bodies of different sizes according to different leg strength of children of different ages, and the driving efficiency is improved. Children of different age groups can conveniently obtain transmission system starting force suitable for leg strength of the children, and the effect that riding is easier and smoother is achieved.

Description

Technical Field

[0001] The present application relates to the field of children's bicycles, and in particular to a children's bicycle suitable for a small-sized transmission system. Background Art

[0002] The transmission system of a bicycle includes the middle axle, chainring, flywheel and transmission chain, which are the key components of a bicycle. At present, the transmission system accessories of children's bicycles are mostly directly applied from adult bicycle accessories, which makes the transmission system size generally larger. However, children have less leg strength. If the transmission system of adult bicycles is directly applied, it will be more difficult for children to start riding. Utility Model Content

[0003] In order to reduce the force required for children to start riding and save more effort when riding, the present application provides a children's bicycle suitable for a small-sized transmission system.

[0004] The present application provides a children's bicycle suitable for a small-sized transmission system, which adopts the following technical solution:

[0005] A children's bicycle suitable for a small-sized transmission system comprises a bicycle body and a transmission system installed in the middle and lower part of the bicycle body, wherein the transmission system comprises a front sprocket (1) fixed on the central axis of the bicycle body, a rear flywheel fixed on the rear wheel, and a transmission chain connected with the front sprocket and the rear flywheel, wherein the gear ratio of the front sprocket and the rear flywheel is 1.2-2, when the size of the bicycle body is 14 inches, the gear ratio of the transmission system is 1.2-1.5, when the size of the bicycle body is 16 inches, the gear ratio of the transmission system is 1.5-1.8, and when the size of the bicycle body is 18 inches, the gear ratio of the transmission system is 1.8-2.

[0006] By adopting the above technical solution, a smaller gear ratio is designed for the transmission system of the children's bicycle. The smaller the gear ratio, the smaller the starting force required for the bicycle, and the more labor-saving it is for children to start. In addition, the gear ratios of the transmission systems of bicycles of different sizes are designed specifically according to children of different age groups, so that the starting force required by the transmission system is adapted to the leg strength of children of this age group: that is, when the body size is small, the transmission system adopts a smaller gear ratio, and when the body size is large, the transmission system adopts a larger gear ratio, so that children of all ages can obtain a starting force suitable for their leg strength.

[0007] Preferably, the gear ratio between the front sprocket and the rear flywheel is 1.5-2.

[0008] By adopting the above technical solution, although a smaller gear ratio saves more effort when riding, it will lead to a decrease in riding speed to a certain extent. By designing the gear ratio of the front sprocket and the rear flywheel to be 1.5~2, a balance is made between riding speed and riding effort, making the performance of the children's bicycle more balanced and more suitable for children to ride and practice.

[0009] Preferably, when the size of the vehicle body is 14 inches, the gear ratio of the transmission system is 1.5, when the size of the vehicle body is 16 inches, the gear ratio of the transmission system is 1.8, and when the size of the vehicle body is 18 inches, the gear ratio of the transmission system is 2.

[0010] Preferably, the number of teeth on the rear flywheel of the 14-inch, 16-inch, and 18-inch vehicle bodies is the same, which is 10 to 16 teeth. The number of teeth on the front sprocket increases with the size of the vehicle body, which is 12 to 32 teeth.

[0011] By adopting the above technical solution, different sizes of bicycle bodies use the same size of rear flywheel, and the gear ratio of bicycles of different sizes can be adjusted only by changing the size of the front sprocket; the conventional transmission system will cause the overall size of the bicycle to be too large, affecting the riding geometry of the bicycle and making it inconvenient for children to exert leg force. The present application reduces the size of the rear flywheel, and the size of the front sprocket is also reduced accordingly on the basis of meeting the gear ratio, and the length of the transmission chain is also shortened, thereby reducing the weight and volume of the transmission system, and the weight of the entire vehicle is also reduced accordingly, which is convenient for children to ride and is lighter and more labor-saving.

[0012] Preferably, the number of teeth of the rear flywheel is 12, and the number of teeth of the front sprocket is designed to be 18 to 24 depending on the size of the vehicle body.

[0013] By adopting the above technical solution, compared with the size of the rear flywheel of the children's bicycle on the market, the rear flywheel of the present application adopts a smaller size, and the size of the front sprocket is also smaller than the size of the front sprocket of the children's bicycle on the market, which makes it easy to reduce the weight of the transmission system, thereby reducing the overall weight of the children's bicycle, making it easier and more labor-saving for children to ride.

[0014] Preferably, the number of teeth on the rear flywheel of the 14-inch, 16-inch, and 18-inch vehicle bodies is the same, the number of teeth on the rear flywheel is 14 to 16, and the number of teeth on the front sprocket is 20 to 32.

[0015] By adopting the above technical solution, the size of the rear flywheel is not changed, that is, the rear flywheel is still selected to be the same size as the rear flywheel on the traditional children's bicycle. The gear ratio is reduced by reducing the size of the front chainring, which makes it easier for children to pedal and start riding.

[0016] Preferably, the number of teeth on the front sprocket of the 14-inch, 16-inch, and 18-inch vehicle bodies is the same, the number of teeth on the front sprocket is 28 to 32 teeth, and the number of teeth on the rear flywheel is 20 to 26 teeth.

[0017] By adopting the above technical solution, on the basis of not changing the front sprocket, that is, the front sprocket still selects the same size of the front sprocket as that on the traditional children's bicycle, the gear ratio is reduced by increasing the size of the rear flywheel, so that the starting force during riding can be reduced.

[0018] Preferably, it also includes a protective cover arranged on the transmission system, and the protective cover is detachably connected to the vehicle body.

[0019] By adopting the above technical solution, a protective cover is added to the outside of the transmission system to prevent the transmission system from scratching children's legs; after adopting a smaller transmission system, the size of the protective cover is also reduced accordingly, the weight of the whole vehicle is lighter, and it is easier to ride.

[0020] In summary, the present application includes at least one of the following beneficial technical effects:

[0021] 1. This application designs a smaller gear ratio for the transmission system of the children's bicycle, which makes it easier and more convenient to start riding. Different gear ratios are designed for bicycles of different sizes according to the leg strength of children of different ages, so as to meet the riding needs of children of all ages.

[0022] 2. Compared with the transmission systems on the market, the rear flywheel and front sprocket are smaller in size, which reduces the overall weight and volume of the transmission system, thereby reducing the weight and size of the whole vehicle, making it easier for children to control, easier to ride, more flexible in leg movements, and easier to exert force;

[0023] 3. Three adjustment methods are designed to change the gear ratio of the transmission system, making it easier to start. By using a smaller rear flywheel and front sprocket, the overall size and weight of the transmission system can be reduced while meeting the appropriate gear ratio of the children's bicycle, thereby reducing the volume and weight of the entire vehicle. Children can ride with less effort, their leg movements can be more relaxed, and it is easier to exert leg force. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the transmission system of a 14-inch children's bicycle.

[0025] Figure 2 It is a schematic diagram of the transmission system of a 16-inch children's bicycle.

[0026] Figure 3 It is a schematic diagram of the transmission system of an 18-inch children's bicycle.

[0027] Explanation of the accompanying drawings: 01, transmission system; 1, front sprocket; 2, rear flywheel; 3, transmission chain; 4, protective cover. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-3 This application is described in further detail.

[0029] The gear ratio of a bicycle transmission system is related to the efficiency of the bicycle. If the number of teeth on the front sprocket 1 and the rear flywheel 2 is the same, then for every pedaling cycle, the two gears and the rear wheel will rotate one circle. If the number of teeth on the front sprocket 1 is greater than the number of teeth on the rear flywheel 2, then for every pedaling cycle, the number of circles the rear flywheel 2 rotates is greater than one circle, and the faster the speed. Therefore, the gear ratio is proportional to the number of teeth on the front sprocket 1 and inversely proportional to the number of teeth on the rear flywheel 2. Therefore, when the gear ratio of the transmission system is smaller, it is more labor-saving when pedaling.

[0030] The front sprocket 1 and rear flywheel 2 of traditional children's bicycles directly use the accessories of adult bicycles. The front sprocket 1 is selected with 32 teeth to 36 teeth, and the rear flywheel 2 is selected with 16 teeth to 18 teeth. The gear ratio is usually 2 to 2.2. Children have less leg strength and it is more difficult for them to pedal to start.

[0031] The present application embodiment discloses a children's bicycle suitable for a small-sized transmission system. Figure 1 The children's bicycle suitable for a small-size transmission system includes a bicycle body (not shown in the figure) and a transmission system 01 fixed to the middle and lower part of the bicycle body. The transmission system 01 includes a front sprocket 1 fixed to the middle shaft at the middle and lower part of the bicycle body, a rear flywheel 2 fixed to the rear wheel, and a transmission chain 3 connected to the front sprocket 1 and the rear flywheel 2. The gear ratio of the front sprocket 1 and the rear flywheel 2 is 1.2~2, and the starting force required by children when pedaling is smaller, which saves more effort when riding.

[0032] And the gear ratio between the front sprocket 1 and the rear flywheel 2 increases with the increase of the size of the bicycle body, that is, a smaller-sized children's bicycle is equipped with a transmission system 01 with a smaller gear ratio, while a larger-sized children's bicycle is equipped with a transmission system 01 with a larger gear ratio. Specifically, in the present application, the gear ratio of the transmission system 01 adapted for a 14-inch bicycle body is 1.2~1.5; the gear ratio of the transmission system 01 adapted for a 16-inch bicycle body is 1.5~1.8; the gear ratio of the transmission system 01 adapted for an 18-inch bicycle body is 1.8~2. This is because the leg strength of children of different ages is different. According to children of different ages, the gear ratios of the transmission systems 01 of bicycles of different sizes are designed specifically, so that the starting force required by the transmission system 01 is adapted to the leg strength of children of that age group, making it easier and more labor-saving for children to ride.

[0033] Generally speaking, there are three ways to change the gear ratio: (1) Increasing the number of teeth on the rear flywheel 2 without changing the number of teeth on the front sprocket 1; (2) Reducing the number of teeth on the front sprocket 1 without changing the number of teeth on the rear flywheel 2; (3) Improving the number of teeth on both the front sprocket 1 and the rear flywheel 2 to reduce the overall gear ratio.

[0034] In the first case, bicycles of different sizes use the same number of teeth on the front sprocket 1, which has 28 to 32 teeth and 20 to 26 teeth on the rear flywheel 2. Although this design can reduce the gear ratio of the transmission system 01, it will cause the overall size of the bicycle to be too large, affecting the riding geometry of the bicycle and making it inconvenient for children to exert force on their legs.

[0035] In the second case, the rear flywheel 2 with the same number of teeth is used for bicycles of different sizes, the number of teeth of the rear flywheel 2 is 14 to 16, and the number of teeth of the front sprocket 1 is 20 to 32. This design allows the transmission system 01 to reduce the size of the front sprocket 1 and the rear flywheel 2 to a certain extent on the basis of meeting the above-mentioned 1.2 to 2 gear ratio, and to reduce the size of the bicycle body to a certain extent, making it easier and more labor-saving for children to ride.

[0036] Further, in the case of (3), the size of the rear flywheel 2 can be selected to be 10 teeth to 16 teeth, which is smaller, on the basis of satisfying the normal riding of the children's bicycle; and the size of the front sprocket 1 can be selected to be 12 teeth to 32 teeth on the body of different sizes on the basis of satisfying the above-mentioned 1.2 to 2 gear ratio. This reduces the size of the front sprocket 1 and the rear flywheel 2 to a certain extent, shortens the length of the transmission chain 3 accordingly, reduces the overall specifications and weight of the transmission system 01, and thus reduces the weight of the whole vehicle accordingly, making the leg movements more relaxed when riding, and making riding more light and labor-saving.

[0037] Although a smaller gear ratio saves more effort when riding, it will lead to a decrease in riding speed to a certain extent. In order to strike a balance between riding speed and riding effort, the gear ratio of the front sprocket 1 and the rear flywheel 2 is designed to be 1.5~2.

[0038] According to the revised gear ratio, the sizes of the front sprocket 1 and the rear flywheel 2 in the above three cases are appropriately revised: in case (1), when the number of teeth of the front sprocket 1 is selected from 28 to 32 teeth, the number of teeth of the rear flywheel 2 is 14 to 20 teeth. In case (2), the number of teeth of the rear flywheel 2 is 14 to 16 teeth, and the number of teeth of the front sprocket 1 is 22 to 32 teeth. In case (3), when the size of the rear flywheel 2 can be selected from 10 to 16 teeth, the number of teeth of the front sprocket 1 is 15 to 32 teeth.

[0039] Preferably, the number of teeth of the rear flywheel 2 of the present application is selected to be 12 teeth, which is smaller in size than the common 14-tooth or 16-tooth rear flywheel 2 on the market and is easier to process. And the rear flywheel 2 with the same number of teeth is used for vehicle bodies of different sizes. On the basis of satisfying the above-mentioned gear ratio of 1.5~2, a 14-inch children's bicycle selects a 12-tooth rear flywheel 2 and an 18-tooth front sprocket 1, and the gear ratio is 1.5. A 16-inch children's bicycle selects a 12-tooth rear flywheel 2 and a 22-tooth front sprocket 1, and the gear ratio is about 1.8. An 18-inch children's bicycle selects a 12-tooth rear flywheel 2 and a 24-tooth front sprocket 1, and the gear ratio is 2. The size of the entire vehicle is smaller, and it is more labor-saving and light for children to ride.

[0040] The children's bicycle also includes a protective cover 4 covering the transmission system 01 to prevent the transmission system 01 from scratching the child's legs; after adopting a smaller transmission system 01, the size of the protective cover 4 is also reduced accordingly, the weight of the whole bicycle is lighter, and it is more convenient to ride.

[0041] The implementation principle of a children's bicycle suitable for a small-sized transmission system in an embodiment of the present application is as follows: a smaller gear ratio is designed for the transmission system 01 of the children's bicycle in three ways, so that the starting force required for the bicycle is also smaller, and it is easier for children to start. The gear ratios of the transmission systems 01 of bicycles of different sizes are designed specifically according to children of different age groups, so that the starting force required by the transmission system 01 is adapted to the leg strength of children of this age group. On the basis of meeting the smaller gear ratio, a smaller rear flywheel 2 and a front sprocket 1 are used, and the overall size and weight of the transmission system 01 are smaller, thereby making the weight of the entire vehicle smaller, and it is lighter and more labor-saving for children to ride.

[0042] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A children's bicycle suitable for a small-sized transmission system, characterized in that: The invention comprises a vehicle body and a transmission system (01) installed in the middle and lower part of the vehicle body, wherein the transmission system (01) comprises a front sprocket (1) fixed on the center axis of the vehicle body, a rear flywheel (2) fixed on the rear wheel, and a transmission chain (3) connected to the front sprocket (1) and the rear flywheel (2), wherein the gear ratio of the front sprocket (1) and the rear flywheel (2) is 1.2-2, when the size of the vehicle body is 14 inches, the gear ratio of the transmission system (01) is 1.2-1.5, when the size of the vehicle body is 16 inches, the gear ratio of the transmission system (01) is 1.5-1.8, and when the size of the vehicle body is 18 inches, the gear ratio of the transmission system (01) is 1.8-2.

2. The children's bicycle with a small-sized transmission system according to claim 1, characterized in that: The gear ratio between the front sprocket (1) and the rear flywheel (2) is 1.5-2.

3. The children's bicycle with a small-sized transmission system according to claim 2, characterized in that: When the size of the vehicle body is 14 inches, the gear ratio of the transmission system (01) is 1.5; when the size of the vehicle body is 16 inches, the gear ratio of the transmission system (01) is 1.8; and when the size of the vehicle body is 18 inches, the gear ratio of the transmission system (01) is 2.

4. The children's bicycle with a small-sized transmission system according to claim 3, characterized in that: The number of teeth of the rear flywheel (2) of the 14-inch, 16-inch and 18-inch vehicle bodies is the same, and the number of teeth of the rear flywheel (2) is 10 to 16 teeth. The number of teeth of the front sprocket (1) increases as the size of the vehicle body increases, and the number of teeth of the front sprocket (1) is 15 to 32 teeth.

5. The children's bicycle with a small-sized transmission system according to claim 4, characterized in that: The number of teeth of the rear flywheel (2) is 12, and the number of teeth of the front sprocket (1) is designed to be 18 to 24 according to the size of the vehicle body.

6. The children's bicycle with a small-sized transmission system according to claim 3, characterized in that: The number of teeth of the rear flywheel (2) of the 14-inch, 16-inch and 18-inch vehicle bodies is the same, the number of teeth of the rear flywheel (2) is 14 to 16 teeth, and the number of teeth of the front sprocket (1) is 20 to 32 teeth.

7. The children's bicycle with a small-sized transmission system according to claim 3, characterized in that: The number of teeth of the front sprocket (1) of the 14-inch, 16-inch and 18-inch vehicle bodies is the same, the number of teeth of the front sprocket (1) is 28 to 32 teeth, and the number of teeth of the rear flywheel (2) is 20 to 26 teeth.

8. The children's bicycle with a small-sized transmission system according to claim 1, characterized in that: It also comprises a protective cover (4) which is arranged on the transmission system (01), and the protective cover (4) is detachably connected to the vehicle body.

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