制動(dòng)器畢業(yè)設(shè)計(jì)外文翻譯-其他專業(yè)-資料下載頁(yè)
2025-01-19 07:46本頁(yè)面
【導(dǎo)讀】制動(dòng)器擠壓制動(dòng)鼓或制動(dòng)片，擠壓的壓力的作用使你的車慢下來(lái)。制動(dòng)系統(tǒng)本質(zhì)上是改變能量的類型。當(dāng)你在全速行駛時(shí)，你的汽車獲得動(dòng)。當(dāng)你踩下剎車，墊子或鞋子對(duì)制動(dòng)鼓和轉(zhuǎn)子的作用轉(zhuǎn)化為摩擦熱能。卻使車的熱能消散，減慢車速。這是熱力學(xué)第一定律，有時(shí)被視為能量守恒定律。產(chǎn)生了一個(gè)機(jī)械的抵御轉(zhuǎn)子的回轉(zhuǎn)運(yùn)動(dòng)。這是完全的制動(dòng)失效。典型的補(bǔ)救辦法，將車停了下來(lái)，等待幾分鐘。由于制動(dòng)部件降溫，吸收熱。新的車輛往往從剎車墊中減少排氣，但他們?nèi)杂兄苿?dòng)失效。一旦轉(zhuǎn)子太熱了，制動(dòng)液開(kāi)始沸騰冒泡。量的轉(zhuǎn)子，其效果可以忽略不計(jì)的。失效賽車在一半路程出局。一步冷卻轉(zhuǎn)子同時(shí)試圖實(shí)際上從襯墊中排掉任何氣體。導(dǎo)致轉(zhuǎn)子產(chǎn)生各類裂縫。"單前沿"是指實(shí)際接觸的旋轉(zhuǎn)鼓輪制動(dòng)蹄部件的數(shù)量。在一端，簡(jiǎn)單的幾何意味著整個(gè)剎車片無(wú)法都接觸到制動(dòng)鼓。制動(dòng)鼓旋轉(zhuǎn)實(shí)際上有助于制動(dòng)片向外加壓，因?yàn)閯x車片向口。由于制動(dòng)鼓向后旋轉(zhuǎn)，前沿的剎車片成為了后沿，因?yàn)橹?
【正文】 e model. The actuator in this case is the blue elliptical object. As that is twisted, it forces against the brake shoes and in turn forces them to expand outwards. The return spring is what pulls the shoes back away from the surface of the brake drum when the brakes are released. See the later section for more information on actuator types. The single leading edge refers to the number of parts of the brake shoe which actually contact the spinning drum. Because the brake shoe pivots at one end, simple geometry means that the entire brake pad cannot contact the brake drum. The leading edge is the term given to the part of the brake pad which does contact the drum, and in the case of a single leading edge system, it39。s the part of the pad closest to the actuator. This diagram (right) shows what happens as the brakes are applied. The shoes are pressed outwards and the part of the brake pad which first contacts the drum is the leading edge. The action of the drum spinning actually helps to draw the brake pad outwards because of friction, which causes the brakes to bite. The trailing edge of the brake shoe makes virtually no contact with the drum at all. This simple geometry explains why it39。s really difficult to stop a vehicle rolling backwards if it39。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。t bite. Drum brakes double leading edge The drawbacks of the single leading edge style of drum brake can be eliminated by adding a second return spring and turning the pivot point into a second actuator. Now when the brakes are applied, the shoes are pressed outwards at two points. So each brake pad now has one leading and one trailing edge. Because there are two brake shoes, there are two brake pads, which means there are two leading edges. Hence the name double leading edge. Disc brakes Some background. Disc brakes were invented in 1902 and patented by Birmingham car maker Frederick William Lanchester. His original design had two discs which pressed against each other to generate friction and slow his car down. It wasn39。t until 1949 that disc brakes appeared on a production car though. The obscure American car builder Crosley made a vehicle called the Hotshot which used the more familiar brake rotor and calipers that we all know and love today. His original design was a bit crap though the brakes lasted less than a year each. Finally in 1954 Citro235。n launched the wayaheadofitstime DS which had the first modern incarnation of disc brakes along with other nifty stuff like selflevelling suspension, semiautomatic gearbox, active headlights and posi te body panels. (all things which were reintroduced as new by car makers in the 9039。s). Disc brakes are an order of magnitude better at stopping vehicles than drum brakes, which is why you39。ll find disc brakes on the front of almost every car and motorbike built today. Sportier vehicles with higher speeds need better brakes to slow them down, so you39。ll likely see disc brakes on the rear of those too.
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