挑战教会零零后新手司机买万元二手车之如何选择变速箱？

　　How to choose a gearbox for a second-hand car worth tens of thousands of yuan?

　　那上一期的话，我们有说到选车是如何选的,以及选哪些品牌,但我发现有很多新手他不会开手动挡的车,只会开自动挡的车,由于手动挡的变速箱跟自动挡的变速箱,它是有区别的,手动挡的话呢，它只会存在一种变速箱,但是自动挡的话呢，它是分为四款,很多新手司机的话，买自动挡的车,他不知道这个变速箱有什么作用,那今天小编一一来给大家解答一下,目前主流自动挡的变速箱呢，分为四种,一种是 a at 、 CVT 、 DCT 、 a amt

　　In the previous issue, we talked about how to choose a car and which brands to choose. However, I found that many beginners do not know how to drive a manual transmission car, but only know how to drive an automatic transmission car. Due to the difference between manual transmission and automatic transmission, manual transmission only has one type of transmission, while automatic transmission is divided into four types. Many novice drivers who buy an automatic transmission car do not know the function of this transmission. Today, the editor will answer for you. Currently, the mainstream automatic transmission is divided into four types: a at, CVT, DCT. a amt

　　那我们先来说 a at 变速箱,at 变速箱呢，简称为液力自动变速箱,它的核心原理是通过液力变矩器传递动力,依靠的是行星齿轮组实现,换挡的结构相对来说是比较复杂的,但是它的主要特点是平顺性跟可靠性很强,能够承受较大的扭矩,但传动的效率相对比较低,并且它的制造成本也很高,那我们在万元二手车市场当中,大多数承载的它其实还是 at 变速箱,因为它的可靠性很强,虽然有一些 a at 变速箱,它可能存在一定的顿挫感,但整体的稳定性是比较好的,而且它的维修案例很丰富,维修成本是相对比较低的,我更建议大家选万元二手车自动挡的,可以选 at 的变速箱。

　　Let's first talk about an at transmission, also known as a hydraulic automatic transmission. Its core principle is to transmit power through a hydraulic torque converter, relying on a planetary gear set. The shifting structure is relatively complex, but its main feature is strong smoothness and reliability. It can withstand large torque, but the transmission efficiency is relatively low, and its manufacturing cost is also high. In the second-hand car market worth tens of thousands of yuan, most of it is actually an at transmission because of its strong reliability. Although some at transmissions may have some jerkiness, their overall stability is relatively good, and their maintenance cases are rich. The maintenance cost is relatively low, and I recommend that you choose a used car with an automatic transmission for tens of thousands of yuan. You can also choose an AT gearbox.

　　那第二个， CVT 变速箱,简称无极变速箱,它的核心原理是通过两组锥形轮,跟一条钢带的摩擦来改变传动比,并且呢是没有固定档位,它主要的优点是在换挡的过程中,同是没有顿挫感的,然后它的燃油经济性也比较优秀,缺点是它的钢带的承受扭矩有限,所以在高速行驶的时候呢,它的噪音可能会比较大,现在市面上普遍的自动挡呢,大多数都是 CVT 变速箱,所以它的使用场景还是挺高的,但是你要是来说它跟 a at 变速箱比的话,肯定是 a at 会更好,因为 a at 的变速箱的话,它的寿命会更长,第三种的话就是 DCT 变速箱,简称双离合变速箱,它这个核心部件呢,是基于手动挡变速箱的结构,拥有两组的离合器,分别呢控制急速档和偶数档,换挡的时候呢,两种离合器可以交替工作,主要优点的话就是它换挡速度快,然后传动效率也高,动力响应也很直接,在低速拥堵的状况下可能会出现顿挫,对离合器的材质要求还是比较高的,但它的制造成本比 at 变速箱便宜,缺点是平顺性呢,它是不如 a at 变速箱的

　　The second one is the CVT gearbox, also known as the continuously variable transmission. Its core principle is to change the transmission ratio through friction between two sets of conical wheels and a steel strip, and it does not have a fixed gear. Its main advantage is that there is no jerking sensation during the shifting process, and its fuel economy is also relatively good. The disadvantage is that its steel strip has limited torque tolerance, so when driving at high speeds, its noise may be relatively loud. Nowadays, most of the automatic transmissions on the market are CVT gearboxes, so its usage scenarios are quite high. However, if you compare it with the A AT gearbox, it will definitely be better because A AT gearbox is better. If the AT gearbox is used, its lifespan will be longer, and the third type is DCT The transmission, also known as the dual clutch transmission, is a core component based on the structure of a manual gearbox. It has two sets of clutches, which control the fast and even gears respectively. When shifting gears, the two clutches can work alternately. The main advantage is that it has a fast shifting speed, high transmission efficiency, and direct power response. In low-speed congestion, there may be jerking, and the material requirements for the clutch are relatively high. However, its manufacturing cost is cheaper than AT gearbox, and its disadvantage is smoothness. It is not as good as AT gearbox

　　另外，干涉的 DC t 变速箱,它散热是比较差的,长期拥堵啊,然后容易过热、磨损,这些后期维护的话都需要注意到。

　　In addition, the DC transmission with interference has poor heat dissipation, long-term congestion, and is prone to overheating and wear, which need to be taken into account during later maintenance.

　　第四种的话就是 a amt 变速箱,简称机械式自动变速箱,目前这个变速箱啊,在这个主流家用车里面呢,已经是很少见的了,它的原理是在手动变速箱的基础上,加上电子的控制单元,模拟人工换挡,结构虽然简单,但是它的平顺性是最差的,且换挡的顿挫感非常明显,驾驶的体验感的话,目前在主流的家用车已经是非常少用的了,所以我是不推荐的,目前最推荐的还是 at 变速箱和 CVT 变速箱,相对来说的话还是比较稳定的,而且在市面上也比较常见,OK ，那今天的内容就到这里,希望对你们有帮助,我们下期再见

　　The fourth type is the AMT gearbox, also known as the mechanical automatic gearbox. Currently, this gearbox is rare in mainstream family cars. Its principle is to add an electronic control unit on the basis of a manual gearbox, simulating manual gear shifting. Although its structure is simple, its smoothness is the worst, and the jerkiness of gear shifting is very obvious. As for the driving experience, it is rarely used in mainstream family cars, so I do not recommend it. The AT gearbox and CVT gearbox are currently the most recommended, which are relatively stable and common in the market, OK ， That's all for today's content. I hope it's helpful to you. See you in the next issue