浅析绿色出行必备工具自行车的一些奥秘自行车是一种很常见的交通工具，很多学生每天都使用它但事实上我们并不很了解它的结构和原理等从整个车身来看，自行车的骨架采用了三角形结构，此结构具有稳定性，不易变形，并运用了空心管材料，既坚固轻便又美观大方车身下方有大小不同的两链盘后轮轴心处一般安有一脚撑，停放车时可助车斜立起来 Bicycle is a very common traffic tools, many students use it every day. But the fact is that we don't know much about its structure and principle. From the whole body, bicycle frame adopts the triangular structure, this structure is stable, not easy to deformation, and the use of a hollow tube material, as well as strong light and elegant. There are two different sizes of the body below the chain plate. There is a general safety supporting axle of the rear wheel, park the car can help the car is inclined to stand up.车的前后各有一轮胎，前轮与车头相连，用于控制方向；后轮与后链盘相连，骑车时是全车的驱动轮。
以前两车轮的轮圈是钢制的，现在一些自行车改用铝合金做轮圈，与钢相比，铝合金既不易生锈，又减轻了车身的重量，更耐用 The car before and after each have a tire, wheel and the front is used to control the direction of the rear wheel, and the chain wheel; after connected, the bike is a driving wheel the whole car. Previous two wheel rim is made of steel, now some bicycle use made of aluminum alloy wheels, compared with steel, aluminum alloy is not easy to rust, but also reduce the body weight, more durable.车的手把、踏板和外胎的设计原理与刹车皮相仿车外胎、手把一般也采用有花纹的橡胶制成，手把的设计使骑车的人能更好地握紧车头而更安全地控制车向。
踏板一般采用有粗糙花纹的塑料制成那为什么踏板要用塑料制而不是更为粗糙的橡胶呢？这是因为橡胶质软，虽然在相同条件下其最大静摩擦力一般远远大于塑料，但无法支撑脚对它的压力而发生形变所以，要采用比较坚硬的塑料 The design principle of the car hand, tyre and brake pedals and leather. Bicycle handlebar, generally using a pattern made of rubber, design the enabling the rider can better hold the front and safer control car. The pedal is generally made of rough pattern of plastics. Why the pedal to use plastic instead of the more rough rubber? This is because the rubber is soft, although under the same conditions the maximum static friction force is generally much greater than the plastic, but cannot support the foot of its pressure and deformation. So, to adopt rigid plastics.当人骑在自行车上时，通过脚踏板连接车链使后链盘转动，带动后轮转动，此时，自行车后轮是主动轮 ，它表面与地面接触的各个部分在与地面接触的瞬间都有一个相对于地面向后运动的趋势，因此，后轮受到地面一个向前的静摩擦力，这个力推动整辆自行车向前运动，这个力就是自行车的主动力。
When people ride on a bicycle, the pedal connecting chain to chain wheel, a back wheel is driven to rotate, at this point, the rear wheel of the bicycle is the driving wheel, all parts of its surface in contact with the ground is in contact with the ground instantly have a relative to trend, backward motion of the ground so, the rear wheel ground a ahead of the static friction force, this force the bike forward movement, a driving force is the force of bicycle.当人骑在自行车上时，自行车除了后轮受到地面向前的摩擦力外，前轮还同时受到地面的阻力。
就是前轮相对于地面向前运动时，地面对前轮有一个向后的摩擦力，阻碍车向前运动，这时，该摩擦力就起了阻碍作用 When people ride on a bicycle, bicycle rear wheel friction except by ground forward, the front wheel has also been resistance to the ground. Is the front wheel relative to the ground to move forward, to face the front there is a backward friction, hindered the car forward movement, at this time, the friction is played the hindrance role.自行车的车座下面安有弹簧，坐垫一般用泡沫、海绵、皮料制成这样的设计使车座具有避震作用当自行车行驶到凹凸不平的路面时，人随着车起伏上下震动，弹簧的弹力增加了人与坐垫的接触时间所以，如果没有这样设计，人坐在车上就会被震得更厉害，这也是坐在后架上的人臀部总比坐在车座上的人痛的原因。
装有避震器的山地车也是根据这个原理在车头和车身装上了弹簧，使其避震效果得到加强 A spring is arranged under the saddle of bicycle cushion, general with foam, sponge, leather. This design makes the seat with shock-absorbing effect. When the bicycle is running to the uneven road surface, people with the car up and down motion, the elasticity of the spring to increase the contact time and the cushion. So, if there is no such design, who sat in the car will be shock worse, cause than to sit on the seat of the pain that is sitting in the frame of the hip. A shock absorber mountain bike is also based on this principle in the head and body installed on the spring, the damping effect is strengthened.自行车后轮的运转就是根据滑轮的原理设计的。
人脚踩脚踏板时带动前链盘转动，前链盘又通过链条带动后链盘转动，前后链盘转动的角速度相同，后链盘又带动后轮转动，则链盘与后轮的角速度相等，但后轮的半径远大于链盘半径，由此后轮线速度增大，提高了车速 The rear wheel of the bicycle is the operation according to the principle of the design. One foot pedal drives the front chain wheel rotates, front chain wheel and driven by chains after the chain wheel rotates, and the angular velocity of the same chain wheel, chain wheel and after the rear wheel is driven to rotate, the chain with rear wheel angular velocity is equal, but the rear wheel radius is far greater than the chain disc radius, the rear wheel line speed increases, improve the speed.时代在发展，科学无处不在。
就连我们日常生活中“简简单单”的一辆自行车也包含着并不简单的科学理论In the era of development, science is everywhere. Even in our daily life " simple " of a bike has not simple scientific theory.。