(畢業(yè)設(shè)計(jì))eq1090載貨汽車變速器設(shè)計(jì)說明書-閱讀頁
2024-08-25 05:01本頁面
【正文】 rset An incredibly odd hydraulic system that controls the clutches and bands A large gear pump to move transmission fluid around The center of attention is the planetary gearset. About the size of a cantaloupe, this one part creates all of the different gear ratios that the transmission can produce. Everything else in the transmission is there to help the planetary gearset do its thing. This amazing piece of gearing has appeared on HowStuffWorks before. You may recognize it from the electric screwdriver article. An automatic transmission contains two plete planetary gearsets folded together into one ponent. See How Gear Ratios Work for an introduction to planetary gearsets. Any planetary gearset has three main ponents: The sun gear The planet gears and the planet gears39。s take a look at a single planetary gearset. One of the planetary gearsets from our transmission has a ring gear with 72 teeth and a sun gear with 30 teeth. We can get lots of different gear ratios out of this gearset. Also, locking any two of the three ponents together will lock up the whole device at a 1:1 gear reduction. Notice that the first gear ratio listed above is a reduction the output speed is slower than the input speed. The second is an overdrive the output speed is faster than the input speed. The last is a reduction again, but the output direction is reversed. There are several other ratios that can be gotten out of this planetary gear set, but these are the ones that are relevant to our automatic transmission.This automatic transmission uses a set of gears, called a pound planetary gearset, that looks like a single planetary gearset but actually behaves like two planetary gearsets bined. It has one ring gear that is always the output of the transmission, but it has two sun gears and two sets of planets.Next you can see the inside of the planet carrier. The shorter gears are engaged only by the smaller sun gear. The longer planets are engaged by the bigger sun gear and by the smaller planets. First Gear In first gear, the smaller sun gear is driven clockwise by the turbine in the torque converter. The planet carrier tries to spin counterclockwise, but is held still by the oneway clutch which only allows rotation in the clockwise direction and the ring gear turns the output. The small gear has 30 teeth and the ring gear has 72, so the gear ratio is: Ratio R/S 72/30 :1So the rotation is negative :1, which means that the output direction would be opposite the input direction. But the output direction is really the same as the input direction this is where the trick with the two sets of planets es in. The first set of planets engages the second set, and the second set turns the ring gear。 but because that clutch is released, the bigger sun gear is free to spin in the opposite direction of the turbine counterclockwise . Second Gear This transmission does something really neat in order to get the ratio needed for second gear. It acts like two planetary gearsets connected to each other with a mon planet.The first stage of the planet carrier actually uses the larger sun gear as the ring gear. So the first stage consists of the sun the smaller sun gear , the planet carrier, and the ring the larger sun gear . The input is the small sun gear。ll remember from the previous section that all we have to do to get a 1:1 output is lock together any two of the three parts of the planetary gear. With the arrangement in this gearset it is even easier all we have to do is engage the clutches that lock each of the sun gears .If both sun gears turn in the same direction, the planet gears lockup because they can only spin in opposite directions. This locks the ring gear to the planets and causes everything to spin as a unit, producing a 1:1 ratio. 譯文：自動(dòng)變速器如何工作如果您曾經(jīng)駕駛一輛自動(dòng)變速器，那么你就知道，自動(dòng)變速器和手動(dòng)變速器有兩個(gè)大的區(qū)別： ?在自動(dòng)變速器的汽車沒有離合器踏板。一旦一切都是自動(dòng)的。結(jié)果表明，自動(dòng)是絕對(duì)驚人！行星＆齒輪比，你會(huì)發(fā)現(xiàn)一個(gè)巨大組合的零件在一個(gè)相當(dāng)小的空間。大小約一個(gè)香瓜，這其中的一部分，創(chuàng)造了各個(gè)不同的齒輪比。這件驚人的齒輪已出現(xiàn)howstuffworks》中。自動(dòng)傳輸包含兩個(gè)完整的行星折疊起來一個(gè)部分。 ?任何行星有三個(gè)主要組成部分： ?太陽輪?行星齒輪和行星齒輪?齒圈上述三個(gè)組成部分，可以輸入，輸出或平穩(wěn)。我們先來看看一個(gè)單一的行星。我們可以得到許多不同的比。第一傳動(dòng)比輸出速度比輸入速度慢。最后是出的方向正好相反。這種自動(dòng)變速器采用了一套齒輪，即所謂的復(fù)合型行星，看上去像一個(gè)單行星但實(shí)際上就像兩個(gè)行星結(jié)合起來。 你可以看到里面的。第一齒輪在第一擋，較小的太陽輪由變矩器順時(shí)針驅(qū)動(dòng)。小齒輪有30個(gè)齒齒圈有72個(gè)，因此，傳動(dòng)比是：Ratio R/S 72/30 :1 ，這意味著輸出方向方向。第齒輪這種傳輸二檔。因此，第一階段太陽（規(guī)模較小的太陽齒輪） ，和（較大的太陽齒輪） 。齒圈（大太陽齒輪），輸出。這聽起來可能比較有趣的，但它。從前面一節(jié)你會(huì)記得，取得1:1的3個(gè)部。這鎖住齒圈行星， 1
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