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Product Name: KX1938 Gear Model

Product Code: KX1938
Size: 150*75*27mm
Weight: About 100g
Material: Wood + Metal Accessories + Chain.
Color: Wooden color
Battery Required: No
Packing: 500pcs
Box Specification: 600*450*550mm

 The main transmission of a bicycle is achieved by the force exerted by the rider on the crankset (chainring), which then drives the chain, which in turn does work on the rear hub (freewheel). Let's perform this experiment together. In 1790, there was a Frenchman named Pierre Michaux who was particularly fond of thinking. One day, he was walking along a street in Paris, which had been flooded with rain, making it very difficult to walk. Suddenly, a large carriage came rolling towards him from behind. The street was narrow, and the carriage was wide, so Michaux had to dodge to avoid being hit by the carriage. He was splashed with mud and rain. Others saw this and felt sorry for him, and they were angry and started to curse, wanting to call the carriage to stop and argue with the driver. Michaux, however, muttered, "Don't shout, don't shout, let them go." As the carriage drove away, he still stood by the side of the road, thinking: The road is so narrow, and there are so many pedestrians. Why can't we change the construction of the carriage? We should cut it in half lengthwise, turning the four wheels into two front and two rear wheels....He thought about this, and upon returning home, he began to design. After repeated trials, the 'Horse-wheeled' cart was created in 1791. This early bicycle was made of wood and had a relatively simple structure. It lacked both a driving mechanism and a steering device. The rider had to rely on their own feet to push the ground to move forward, and when changing direction, they had to get off the bike to move the vehicle. Even so, when Sivrac rode this bicycle to take a pleasure ride in the park, the people present were quite surprised and admiring.

Bicycle sports are semi-mechanical sports. Coaches and athletes should master certain mechanical principles and knowledge of mechanics, effectively utilize the transmission ratio, reasonably control the intensity of the movement, and cleverly save physical energy consumption, thus being able to conduct high-quality and efficient scientific training with ample physical strength. The bicycle is a transmission mechanical device, its transmission equipment includes: the driving gear (commonly known as the wheel), the driven gear (commonly known as the flywheel), the chain, and the gear shifting device. The gear ratio and the transmission ratio are related to the efficiency of the bicycle. Coaches and athletes should understand and master the calculation and application of these data. Gear ratio: the ratio of teeth between the driving wheel and the driven wheel is the gear ratio.

If the teeth numbers of two gears are the same, then each time the pedals are turned once, both the two gears and the rear wheel will rotate once. If the teeth number of the driving gear is greater than that of the driven gear, then for each pedal turn, the driven gear will rotate more than one turn, meaning the faster the speed. Therefore, the gear ratio is proportional to the teeth number of the driving gear, and inversely proportional to the teeth number of the driven gear. Represented by G for the gear ratio, C for the teeth number of the driving gear, and F for the teeth number of the driven gear, the relationship between them is expressed by the formula, that is:

G = C / F

For example: the chainring of ATX830 is 44 teeth (size 3), and the cassette is 11 teeth (size 9), so the gear ratio can be calculated by the formula.

G=C/F=44/11=4

In other words, pedaling the crankshaft once, the flywheel turns four times.

Zhejiang Jianyi Education Technology Co., Ltd.
Zhejiang Jianyi Education Technology Co., Ltd. (formerly Yifei Toy Factory)Established in 2007, the current brand is "XING TEACHER" and "JIAN YI". Over the past 10 years, our company has made unremitting efforts to make the enterprise gradually mature. Our company is a member of the Teaching Equipment Industry Association of the Ministry of Education, and is a leading enterprise in Zhejiang Province. The company has been awarded the "Heavy Contract and Credit-Keeping" unit for three consecutive years by Jinhua City. In 2014, it was awarded the "Advanced Collective of Jinhua Teaching Instrument Industry" by Zhejiang Province.
Zhejiang Jianyi Education Technology Co., Ltd. is a high-tech enterprise that integrates modern scientific research and development of educational equipment, curriculum design, teaching resource integration, and technical services. Zhejiang Jianyi Education Technology Co., Ltd., with high-tech products and modern educational equipment, has established itself in the education industry. Our products are sold all over the country and have been exported to Europe, America, Japan, and South Korea. After years of accumulation, the company has begun to take shape. In terms of technological innovation, the company has professional design personnel engaged in the research and development of complete sets of educational products and the upgrade of existing products; in production, management, and installation services, the company strictly implements the ISO9001 international quality assurance system standards; in marketing, the "Xing Teacher" products have been introduced into many provinces and cities in the country and enjoy a good reputation; for many years, it has provided high-quality, advanced, professional series of modern teaching equipment and professional equipment research and development custom services for the education industry. With excellent, high-quality professionals and perfect after-sales service quality, the company has established a good corporate image.Xing teacher's" series of science and education physics, chemistry, photovoltaic, wind energy, geography, biology, art, and so on, has successfully won bids in the education bureau tenders multiple times. Zhejiang Jianyi Education Technology Co., Ltd. continues to adhere to the business philosophy of "quality first, service to diligence, honesty in character," and upholds the "Xing teacher" culture, casts the "Xing teacher" brand, and creates the development policy of the "Xing teacher" career. We provide excellent equipment and high-quality services for school teaching and scientific research. We are willing to cooperate sincerely with new and old friends at home and abroad, work together, and devote our efforts to education and education.

  Before assembling, please check if the circuit is unblocked and all the components are complete. Ensure that all contact points are in good contact. During the assembly process, be careful not to get glue on your clothes or skin. Keep the parts out of reach of younger siblings to prevent them from swallowing them by mistake! Do not play with them on your head, to avoid the model falling and injuring you!