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When the speed reducer brakes the shuttle unit, numerous high-pressure lubrication zones are formed between the frictional contact surface convexities of the brake rail and the wheel, so that the contact surfaces are forced to separate under high pressure. In this case, the friction surfaces cannot directly generate friction, but friction occurs between the lubricating films, which causes the friction coefficient μ to drastically decrease (less than 1/5 of the original value), causing the braking force to decrease sharply or even to lose. To make the braked vehicle exceed the accuracy of the control system's constant speed control at the speed reducer outlet, resulting in overspeed linked.
The compressive elastic modulus of the composite material is 2 to 3 orders of magnitude smaller than that of the rail, which can significantly increase the frictional contact area between the wheel and the brake beam. The thermal conductivity of the composite material is 2 orders of magnitude lower than that of steel, which can cause the surface fluid film to be heated. Reduced viscosity reduces lubrication. Composite materials can contain various types of fibers and granular fillers. After being shed, they are mixed with surface fluids, showing a certain degree of abrasive wear and adhesive wear and increasing the friction coefficient. Composite materials can make the fluid from a fluid lubrication state to a boundary lubrication state. In the transition, the high-pressure fluid between the friction interfaces is destroyed, so that the friction braking force is kept stable or reduced; the stability of the friction coefficient of the composite material is better.
The flashing of the rolled material during the running of the wheel will cut the composite material, resulting in a shorter service life of the composite brake splint. In contrast, metal materials have high hardness and good anti-cutting performance. Moreover, by adjusting the parameters of metal materials such as composition, structure, and structure, the performance of speed reducers can also be significantly improved.
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