The bicycle flywheel is an important component in the bicycle drive system, which, together with the pedal, crank, sprocket, and chain, constitutes the transmission system of the bicycle. The bicycle flywheel is usually installed on the center axle of the rear wheel of the bicycle, usually located on the right side of the center axle of the rear wheel, and is a circular toothed object closely connected to the pedal, crank, sprocket, and chain. When an athlete steps on the pedal, the driving force converted from human labor through the pedal, crank, sprocket, chain, and flywheel is transmitted to the rear wheels, generating a forward thrust to drive the rotation of the rear wheels and achieve the purpose of cycling. It is a key component that enables bicycles to achieve driving motion.
A bicycle flywheel is a one-way pulley with a toothed appearance. Composed of a toothed outer ring, bottom cover, lock cover, gasket, multiple small steel balls, claws, and steel wire springs.
Toothed outer ring: The serrated and rotatable circle we see on the center axle of the bicycle rear wheel in daily life is the toothed outer ring of the bicycle flywheel. The appearance of the toothed outer ring is serrated, which can be easily identified with a slight distinction. The inner wall of the toothed outer ring is not smooth, but a circle of trapezoidal rodents that can mesh with the claws. When the athlete steps on the pedal, the tooth protrusions on the toothed outer ring just mesh with the gap of the chain, forming a whole and generating tension, thereby driving the rotation of the toothed outer ring of the bicycle flywheel. Because the tooth protrusions on the toothed outer ring are integrated with the rodents on the inner wall, when the outer ring of the bicycle flywheel rotates, it naturally drives the claws that mesh with the rodents. The claws are installed on the bottom cover of the bicycle flywheel, which is installed on the center shaft of the bicycle rear wheel. It is precisely because of this tight connection and meshing interaction that a forward thrust is generated when an athlete steps on the pedal, driving the bicycle to move forward. The trapezoidal rodent structure on the inner wall of the toothed outer ring is the core design for bicycles to achieve sliding motion. Therefore, when the wheels are in inertial motion, the claws cannot mesh with the rodents due to the trapezoidal shape, resulting in a sliding state. Its function is to reduce excessive physical exertion and meet the needs of deceleration and parking during driving.
Bottom cover: The bottom cover of a bicycle flywheel is an important component on the flywheel and is the skeletal structure of the flywheel. The claws, wire springs, small steel balls, and lock covers inside the flywheel are all installed on the bottom cover. It has the function of supporting the body.
Lock cover: A fixed nut on the flywheel, screwed onto the bottom cover to lock the flywheel bottom cover and protect internal components from displacement or loss.
Gasket: Similar to the filling material inside a flywheel. When all the parts inside the flywheel are inserted and the lock cover is tightened, there is still a gap inside the flywheel, which causes shaking when the flywheel rotates. To reduce the gap and prevent shaking, a gasket is added inside.
Small steel balls: The flywheel is filled with small steel balls tightly adjacent to each other on both sides, and the ball grooves are coated with lubricating oil. When the flywheel is in motion, it serves to lubricate the components and reduce resistance.
Paw: When an athlete steps on a bicycle pedal, the transmission system drives the toothed outer ring of the bicycle flywheel. The rodents inside the toothed outer ring mesh with the claw, while also driving the rotation of the wheel. Thus achieving the purpose of driving the bicycle, and due to the trapezoidal rodent structure on the inner wall of the toothed outer ring, when the wheel is in inertial motion, the pawl cannot engage with the rodent due to its trapezoidal shape, resulting in a sliding state, thereby reducing excessive physical exertion and meeting the needs of deceleration and parking during driving.
Wire spring: installed inside the flywheel bottom cover. When the bicycle flywheel is in forward motion, it is a power component of the pawl device to ensure that the pawl can autonomously engage with the rodent inside the toothed outer ring.
The material of bicycle flywheel is generally made of titanium alloy, pure steel, pure aluminum, etc.
Titanium alloy: It is an alloy metal made of various titanium and other metals. High strength, good corrosion resistance, and high heat resistance. Mainly used for making compressor components for aircraft engines, followed by structural components for rockets, missiles, and high-speed aircraft. The characteristics of titanium alloy used in the production of bicycle flywheels are symbolic materials that reflect the identity and status of their owners. It combines safety, high-end, and cool performance, making it an excellent material for making flywheels.
Pure steel: a traditional material for making flywheels, characterized by high strength, wear resistance, and good toughness. Pure steel is a traditional material used to make flywheels, with a long history of use since the birth of bicycles. Consumers generally choose bicycle flywheels made of this material.
Pure aluminum: a new type of flywheel material characterized by lightweight, corrosion resistance, and high strength. Widely used in aviation equipment, mold making, and some precision instruments. This new type of flywheel material is more suitable for professional athletes' training and competition vehicles.
Bicycle flywheels are classified into two types based on speed: single speed and multi speed.
Single speed flywheel: As the name suggests, it is a flywheel with only one speed, and the rotational speed of the flywheel is determined by the athlete's pedaling frequency. This design makes cycling less fun.
Multi speed flywheel: It is a flywheel made by stacking multiple teeth with different diameters through riveting technology according to a certain specification. Stacking a gear plate results in 1 speed, while typically multi speed flywheels produced from the factory have at least 6 speeds. The common type on the market is a 6-11 speed flywheel. The characteristic of a variable speed flywheel is that it can use multiple single toothed discs on the flywheel to adjust the chain through the variable speed system, achieving the pleasure of riding at different speeds and breaking free from the constraints of pedaling frequency. When riding uphill, you can use the variable speed system to adjust the speed that suits your step frequency, reduce physical exertion, and achieve the goal of sports and leisure.
The function of bicycle flywheel
The bicycle flywheel is an important component of the transmission system. It is an important component that converts mechanical power into driving force. When the force of the athlete stepping on the pedal is transmitted to the flywheel, the bottom cover component of the flywheel needs to convert the mechanical force into driving force to drive the rotation of the bicycle rear wheel, achieving the goal of people riding bicycles for leisure sports.
Characteristics of bicycle flywheel
The characteristics of bicycle flywheels include: lightweight, durability, smooth shifting, and multiple structural forms. Bicycle flywheels are usually made of materials such as titanium alloy, pure steel, and pure aluminum to ensure high strength and lightweight. Its performance is mainly reflected in weight, friction, and durability. The lighter the weight, the smaller the flywheel inertia, and the faster the acceleration and deceleration. The lower the friction of the flywheel, the smoother the acceleration and deceleration, and it has good durability, able to withstand long-term use and complex road conditions.
The structural design of a flywheel is very complex, usually consisting of multiple gears that can be of different sizes to provide different speed ratios. The teeth on the flywheel have different shapes and are designed with grooves on the side, which helps ensure smooth gear shifting between the gears.
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Marketing website：www.hubs-sf.com Enterprise email：sales@shunfeng-china.com