Efficient Wheel Design Reduces Friction高效率的车轮设计，减少摩擦
Friction occurs when two surfaces come into contact, as when a wheel rests on a floor.摩擦发生时，两个表面接触到的，正如当一个车轮，有赖于一个楼层。 Friction is the force that resists movement between the objects.摩擦是武力抵制运动之间的物体。 Under theoretically perfect conditions, the ideal wheel environment would be a hard, smooth wheel rolling over a hard, smooth surface.根据理论上完善的条件下，车轮理想的环境，将是一个努力，顺利车轮滚动硬，表面光滑。 In real life, perfect conditions never exist.在现实生活中，完美的条件，从来没有存在。 In a typical work environment, using a hard wheel will often result in higher rolling resistance, as well as increased noise and vibration.在一个典型的工作环境，使用硬车轮往往会导致更高的滚动阻力，以及增加了噪音和振动。
Both static and dynamic forces affect friction.静态和动态的力量影响摩擦。 The initial push force necessary to place an object in motion is the static force.最初的推动力量有必要的地方，一个物体在议案是静力。 Static force is generally greater than dynamic force which is the exertion necessary to keep the object moving.静力一般大于动力，这是劳累，需要保留的对象感人。 Wheel design must consider bother static and dynamic force.车轮的设计必须考虑理会静态和动态的力量。
In a wheel or caster system, there are three places where friction can affect force:在一个车轮或连铸机系统，有三个地方的摩擦可以影响力：
- at the point where the axle and wheel interface;在点轴和车轮界面;
- if a swivel caster, in the swivel housing; and如果旋转式连铸机，在旋转的房屋;
- at the ground/wheel interface, particularly at any points where the wheel will slide or pivot on a surface.在地面/车轮界面，尤其是在任何点的车轮将幻灯片或枢轴上表面。
The efficiency of a wheel or caster in reducing friction is dependent not only upon the appropriate design of the wheel itself, but also on the materials used in its construction and the placement of the wheels on the equipment to be moved.效率的一个车轮或连铸机在减少摩擦不仅取决于后，适当设计的车轮本身，而且对所用的材料在其建设和安置的车轮上的设备动议。
