制動(dòng)器畢業(yè)設(shè)計(jì)外文翻譯-其他專業(yè)-wenkub.com
2025-01-15 07:46 本頁(yè)面
【正文】 s). Disc brakes are an order of magnitude better at stopping vehicles than drum brakes, which is why you39。s equipped only with single leading edge drum brakes. As the drum spins backwards, the leading edge of the shoe bees the trailing edge and thus doesn39。s only really two types of bicycle brake those on which each brake shoe shares the same pivot point, and those with two pivot points. If you can look at a bicycle brake and no t understand what39。d need to push pretty hard to generate the fricti on required to slow the disc down. Now imagine doing the same thing but clamping your thumbs together close to the outer rim of the disc. The disc will stop spinning much more quickly and your thumbs won39。ll see the front wheels have huge scoops inside the wheel pointing to the front (see the picture above). This is to duct air to the brake ponents to help them cool off because in F1 racing, the brakes are used viciously every few seconds and spend a lot of their time trying to stay hot. Without some form of cooling assistance, the brakes would be fine for the first few corners but then would fade and bee near useless by half way around the track. Rotor technology. If a brake rotor was a single cast chunk of steel, it would have terrible heat dissipation properties and leave nowhere for the vapourised gas to go. Because of this, brake rotors are typically modified with all manner of extra design features to help them cool down as quickly as possible as well as dissapate any gas from between the pads and rotors. The diagram here shows some examples of rotor types with the various modification that can be done to them to help them create more friction, disperse more heat more quickly, and ventilate gas. From left to right. 1: Basic brake rotor. 2: Grooved rotor the grooves give more bite and thus more friction as they pass between the brake pads They also allow gas to vent from between the pads and the rotor. 3: Grooved, drilled rotor the drilled holes again give more bite, but also allow air currents (eddies) to blow through the brake disc to assist cooling and ventilating gas. 4: Dual ventilated rotors same as before but now with two rotors instead of one, and with vanes in between them to generate a vortex which will cool the rotors even further whilst trying to actually 39。t stay between the pad and the rotor, it forms a thin layer between the two whilst trying to escape. The pads lose contact with the rotor, reducing the amount of friction and voila. Complete brake fade. The typical remedy for this would be to get the vehicle to a stop and wait for a few minutes. As the brake ponents cool down, their ability to absorb heat returns and the next time you use the brakes, they seem to work just fine. This type of brake fade was more mon in older vehicles. Newer vehicles tend to have less outgassing from the brake pad pounds but they still suffer brake fade. So why? It39。re travelling at speed, your vehicle has kiic energy. When you apply the brakes, the pads or shoes that press against the brake drum or rotor convert that energy into thermal energy via friction. Th
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