The solution is as follows:
1. Drum brake system can be solved by grinding brake pads with sandpaper.
2.V-brake and C-brake systems can be solved by scrubbing the brake pads and rims with neutral detergent.
3. The disc brake system can be solved by scrubbing the brake disc and the brake disc with alcohol or detergent. (or due to serious wear and tear, it is necessary to replace the incoming parts)
Extended data
Composition:
system structure
Bicycle frame, tires, pedals, brakes, chains and other 25 components, the basic components are indispensable. Among them, the frame is the skeleton of the bicycle, which bears the largest weight of people and goods. According to the working characteristics of each component, it can be roughly divided into guiding system, driving system and braking system:
1. Guidance system: composed of handlebar, front fork, front axle, front wheel, etc. The rider can change the driving direction and keep his body balanced by manipulating the handlebar.
2. Drive (transmission or walking) system: It consists of pedal, central shaft, toothed plate, crank, chain, flywheel, rear axle and rear wheel. The pedaling force of people's feet is driven by pedals through crank, sprocket, chain, flywheel, rear axle and other parts, thus making the bicycle move forward continuously.
3. Brake system: composed of brake parts, the cyclist can control the brake at any time to slow down and stop the running bicycle and ensure the driving safety.
In addition, for the sake of safety and beauty, as well as from the practical point of view, we also assembled car lights, brackets, bells and other components.
form
1. Body parts: including
Frame, front fork, handlebar, seat and front fork are the main parts of a bicycle. The transmission part includes pedal, crank, sprocket, chain, central shaft and flywheel. The pedal is stepped by manpower, and the wheel is driven to rotate and drive forward through the transmission parts.
2. Action part: front wheel and rear wheel, including front wheel and rear wheel axle, spokes, rims (rims), tires, etc.
3. Safety devices: including brakes (brakes), lights, bells, mirrors, etc.
Some accessories can be added as needed, such as brackets, clothes hangers, safety forks, fenders, air pumps, etc. In addition, sports cars, racing cars and mountain bikes equipped with speed change mechanisms are also equipped with speed change controllers and front and rear derailleurs.
4. The composition of the hand-foot dual-power bicycle: A box made of alloy is added to the frame of the traditional bicycle, which contains various transmission parts. Through the interaction of forces, the dual power of hands and feet can be realized. Simply push and pull the handlebar, and the bicycle can move forward with the handlebar, which is both labor-saving and fitness.
ingredient
1. Frame parts are the basic structure, skeleton and main body of bicycles, and other parts are directly or indirectly installed on the frame.
There are many structural forms of frame parts, but they can be roughly divided into two categories: men's frames and women's frames.
Because the bicycle runs by the driving force and riding skills of the human body, the frame becomes an important structure to bear the impact load generated by the bicycle during running and whether it can carry the human body comfortably and safely. The manufacturing accuracy of frame components will directly affect the safety, stability and lightweight of vehicles. Generally speaking, spokes have the same diameter. In order to reduce gravity, the spokes with two big ends and a small middle are made into variable diameter spokes, and the spokes are made into flat streamline to reduce air resistance.
2. Outer tires: There are two kinds of soft side tires and hard side tires. The cross section of the soft sidewall tire is wide, which can completely wrap the inner tube, and the landing area is relatively large, so it is suitable for driving on various roads. Hard-edged tires have the advantages of light weight, small landing area, small resistance and light driving.
The pattern on the tire is to increase the friction with the ground. Mountain bikes are especially wide in tire width and deep in pattern, and are also suitable for cross-country mountains.
3. Pedal assembly: The pedal assembly is assembled on the left and right cranks of the middle axle assembly, and is a device that converts horizontal force into rotational force. When a bicycle is riding, the pedal force is first transmitted to the pedal assembly, and then the pedal shaft rotates the crank, the toothed plate, the central shaft and the chain flywheel to make the rear wheel rotate, thus making the bicycle move forward. Therefore, whether the structure and specifications of the pedal assembly are appropriate will directly affect whether the rider's foot position is appropriate and whether the bicycle can run smoothly.
Pedal: It can be divided into integral pedal and combined pedal. No matter what style of pedal, it must have a pedal surface, which is safe and reliable, has certain anti-skid performance, and can be made of rubber, plastic or metal materials. The pedal must turn flexibly.
4. Front fork assembly: The front fork assembly is located at the front of the bicycle structure, and its upper end is connected with the handlebar assembly, the frame assembly is matched with the front tube, and its lower end is matched with the front axle assembly to form the guiding system of the bicycle.
Turning the handlebar and the front fork can change the direction of the front wheel and play a guiding role in the bicycle. In addition, it can also play a role in controlling the operation of bicycles.
The front fork is a cantilever beam, so the front fork must have sufficient strength and other properties.
5. Chain: Chain, also known as cart chain and roller chain, is installed on the coupling wheel and flywheel. Its function is to transfer pedal force from crank and sprocket to flywheel and rear wheel to drive the bicycle forward.
Sprocket: made of high-strength steel to ensure the required tension.
6. Flywheel: The flywheel is fixed at the right end of the rear axle through internal thread, keeps the same plane with the sprocket, and is connected with the sprocket through a chain to form the driving system of the bicycle. Structurally, it can be divided into two categories: single-stage flywheel and multi-stage flywheel.
Single-stage flywheel, also known as single sprocket flywheel, is mainly composed of jacket, flat block and core, jack, jack spring, washer, steel wire block and several steel balls. The working principle of single-stage flywheel is that when the pedal steps forward, the chain drives the flywheel to rotate forward. At this time, the inner teeth of the flywheel are contained with the jack, and the rotating force of the flywheel is transmitted to the movement through the jack, and the movement drives the rear axle and the rear wheel to rotate, so that the bicycle can move forward.
When the pedal stops, the chain and sheath do not rotate, but the rear wheel still drives the movement and jack to rotate forward under the inertia. Pedal in the opposite direction, and the jacket rotates in the opposite direction, which will accelerate the sliding of the jack and make the "click" sound more urgent. Multi-stage flywheel is an important part of bicycle transmission.
On the basis of single-stage flywheel, multi-stage flywheel adds several flywheel blades, which are combined with the sprocket on the central shaft to form various transmission ratios, thus changing the speed of bicycle.
Classification:
Ordinary bicycle
Generally refers to Kun car, riding posture is standing with bent legs. The advantage is that riding for a long time is very comfortable and not easy to get tired. The disadvantage is that the leg bending posture is not easy to accelerate, and it is difficult to achieve high speed because most ordinary bicycle parts use very ordinary parts.
Road bike
For vehicles used on smooth roads, due to the low resistance of smooth roads, the design of road bicycles is more concerned with high speed. They often adopt downward-bent handlebars that can reduce wind resistance, narrow high-pressure and low-resistance tires, higher gears and larger wheel diameters than ordinary mountain-climbing off-road vehicles. Because the frame and accessories don't need to be strengthened like mountain bikes, they are often light in weight and efficient when riding on the road. Because the frame does not need to be strengthened, it often adopts a simple and efficient diamond design, and the road bike is the most beautiful bicycle.
exercise bike
Health, fashion, new concept and new concept design of fitness bike, the most important feature is the dual power of hands and feet, the speed can reach 40 km/h; There are many ways to work and the fitness effect is good. When riding this kind of bicycle, both hands and feet can do work on the bicycle drive at the same time, or they can do work with their hands or feet alone. Adopting the straight line method of pulling the pedal and the swing method of pulling the swing lever by hand not only improves the running speed of the bicycle, but also exercises the leg muscles and arm muscles. Obtained a number of national patents, suitable for middle-aged and elderly people as a means of transportation for fitness, but also suitable for young people to travel and entertain.
Track cycling race
Bicycles used on extremely smooth oval tracks indoors have no brakes (for braking), no gearbox and no reversible flywheel.
Triathlon/ Time Trial Bike (Triathlon/Time Trial Bike) A road bike used for triathlon and time trial sports. The biggest feature of triathlon and time trial is that draught is not allowed, that is to say, athletes must overcome air resistance by their own efforts and are not allowed to ride behind other athletes. Therefore, the design of triathlon/time trial bicycle puts great emphasis on maintaining the riding posture of athletes to reduce air resistance. Triathlon bicycles also allow athletes to use similar muscle groups when riding, which makes it easier to switch from riding to running.
mountain bike
Mountain bike originated in San Francisco 1977. Vehicles designed for driving in mountainous areas usually have gearboxes, which can change labor-saving or fast gears. Some will install shock absorbers on the frame, and some tire treads are chocolate patterns, which is convenient for riding on unpaved roads. The dimensions of mountain bike parts are generally in English units. The rim is 24/26/29 inches, and the tire size is generally 1.0-2.5 inches. The frame size is also expressed in English units, such as 14 ",17" and 19 ". It is divided into many categories in detail, and the common one is xc category. Variable speed, good tire grip, suitable for off-road, shock absorption system to reduce bumps. Overall strength, strong impact resistance. Compared with ordinary bicycles, it is not easy to be damaged when riding hard.
Downhill bike
Downhill bike, also known as downhill bike. English abbreviation DH. This is a very challenging activity. Riders use special DH bicycles to slide on the hillside and even fall down the mountain for excitement. Activities are mostly carried out on ridges, mines and snow. The Austrian set a world record of 2 10.4KM/H/h with DH. The frame angle of downhill bike is different from that of mountain bike, and the parts are in English units like mountain bike. You must wear a helmet, armor and other equipment when doing this job. The damping stroke of the front fork is longer than that of mountain bikes and XC bikes. Tire width is generally more than 2 inches.
child's bike
Children's bicycles are also called children's bicycles and children's bicycles. Chinese mainland, Taiwan Province Province and Singapore are usually called "children's bicycles" or "children's bicycles". In Hong Kong and Macau, it is often called "children's bicycle". Children's bicycles are a major category of baby carriages, including children's bicycles, children's strollers, baby walker, children's tricycles and so on.
touring bicycle
Developed from road bike, it is suitable for self-sufficient travel in long distance, with more comfortable and relaxed frame geometric design, being able to bear load, extremely low gear, using wider tires, pursuing reliability and durability in the choice of accessories, rather than paying attention to weight loss, and often using mountain bike pedals. Evolved for the mountains. Most of them are the same as mountains, but the configuration is more flexible. For example, the handlebar can be changed into a butterfly shape, and many postures can be used to reduce long-term fatigue. The front fork can also be equipped with damping or non-damping. The wheels can be 700c or 26 inches. But the brakes are generally V-type brakes. It is convenient to install shelves, tile covers and camel bags. In a word, all the changes are to increase durability and reduce fatigue during long distance.
Death flying bike
The dead car originated from the track bike, and the flywheel is fixed. If you step forward and step back, the car will move backwards. Later, some other cyclists used abandoned track bikes as a means of work transportation, which can travel quickly in the city at a low price and require certain riding skills. These characteristics make it popular among cyclists in Britain, America and other countries and become a street culture. Major bicycle brands have followed suit, developing and popularizing continuously variable speed bicycles, making them deeply loved by the public and becoming the most popular bicycle style in the city. Pure dead flying cars need certain technology and are dangerous, so the products developed by these manufacturers are both dead flying and live flying, and are equipped with brakes to ensure safety.
Multiplayer bicycle
Also known as a cooperative car, more than two people work together, and the first person controls the direction. It is mostly used in tourist attractions for couples, family and friends to play.
folding bicycle
It is a vehicle designed for easy carrying and loading in the car. In some places, railways, aviation and other public transport vehicles allow passengers to carry foldable bicycles with them.
glandefahren
Also known as BMX, it is divided into many types, such as flat flowers, street shooting, slopes and so on. Every game is different. In addition, this picture is not a BMX, but a conceptual climbing bike.
Engineering vehicle
Technical bicycle is a kind of bicycle specially used for extreme sports. In order to be more suitable for stunts, this kind of bicycle has made many modifications, such as lighter but stronger body, no transmission device, no shelf, and even the brake mechanism has been removed.
(Baidu Encyclopedia-Bicycle)