这车在高速公路上稳定吗？

前几天在藏北看到一辆飞腾,觉得不怎么好看
jimny我觉得哪都好,就是价格贵了些,10万就好了

其实所谓硬派越野实际用途也有限
前几天去藏北双湖,9天,lc80连4驱都没用一次
当然那几天天气也不错

兄台的发言让我受益匪浅啊，多谢多谢！

自动档的液压离合器－－液力变矩器，它的奇特有趣的结构、原理和特点，让我对自动档有了新的认识。原来，我一直误以为手动档肯定比自动档有劲（对于同一款发动机），现在看来，并不皆然，需要具体情况具体分析，既要考察设计中的不同参数，也要考察不同设计方式下的不同表现形式。

这么看来，吉姆尼手动档车和自动档车，在动力扭矩输出方面还是考虑得比较周全的。

由于自动档车的总减速比计算公式中多了一项可以多倍可变放大的因子－－“液压减速比”，显然，为了使得自动档车与手动档车在动力扭矩方面实现相对较均衡的设计目标，自动档车的其余各项传动比，是可以设计为比手动档的低一些，但这并不意味着自动档车的动力扭矩最终输出性能就肯定会比手动档差，不同档位的情况可能会有所差别，但是在总体上可能是比较趋近的。

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下面是吉姆尼车友会一位网友提供的对比数据：



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以上数据，我倒是没有复核过。如果考虑到自动档车的液力变矩器的倍乘因素，以及发动机扭矩输出曲线因素，实际上，吉姆尼自动档车与手动档车的差距并没有原先想象的那么大，倒档的差距确实比较大一点（但是，一般情况下，倒档时很少“发神经”爬坡或踩地板油的，一般是陷坑洼地里才会在倒档时踩大油门，这点差别平时基本上无所谓），其余各个档位，实际上差距并不大，自动档在地板油时，输出扭矩应该还大一些。

这种情况下，如果不在乎手动档操控乐趣的话，自动档确实是不错的选择。再思量一下吧，偶的手动档信念确实被液力变矩器所动摇了

沙漠之箭兄，你的理解是对的。手动车由于直接传动，所以要达到最大扭矩，必须是发动机处于最大扭矩状态，不过此时常常不是最大功率状态。液压离合器，相当于一个功率传递装置，不考虑自身的效率，可以看成是输入和输出的功率保持不变。它的基本原理是先用发动机带动叶片推动液体流动，把发动机的转动能量转换成液体的流动能量。然后再用液体推动另一个叶片，把液体的流动能量转换成转动能量输出。这样，如果发动机高速转动，车子不动，就可以获得最大扭矩。当然，这只是从发动机和离合器的角度看。

只考虑操作的特点我觉得自动车和手动车各有特点。
手动车：
1.操作直接，反应快，跳档方便。
2.低速比较容易精确控制车辆，毕竟多了一个离合器。
3.一般比自动车档位多，车速高时噪音小。
4.最大扭矩比较小，特别是低速用一档时，转速上不去，发动机的潜力不能充分利用。
5.操作不好有死火的可能，某些紧急情况比较危险。
6.手动换档比较慢，某些紧急情况不如自动车。

自动车:
1.因为自动的，跳档只可以用大脚油门（kick down）有大约半秒的延迟。手自一体的话跳档不方便。
2.低速时不好精确控制，特别是地面不平有障碍时。
3.档位少，高速时发动机转速高，隔音不好会有点吵。
4.低速时最大扭矩比较大，加速比较好（当然是指常见的家用车，发动机功率是瓶颈）。在起步时，如果用地板油，我以前的车会一档到大约40-50公里每小时，然后换到二档，发动机基本保持在4-5千转。如果是爬坡，地板油基本是二档，4-5千转。
5.自动保护，不会死火。
6.自动换档比较快。

就选车而言，我觉得自动手动各有特点。用车的时候最好是扬长避短。了解自己车的长处和短处，避免在车子不适合的情况下使用它。另外只需考虑自己80%的使用情况即可，没有车子是全能的。个人认为，如果主要供日常用，自动的比较好，玩的或第二辆可以考虑来个手动的。

另外友情提示一下，买了车后，仔细学习车子的说明书。一切首先以随车带的说明书为准，说明书没有提到的情况，再参考其它的资料。

“但是，由于手动档的总减速比大于手动档的总减速比”，手误，应为“但是，由于手动档的总减速比大于自动档的总减速比”。

你看我这样理解对不对：

对于手动档，正常工况下，松开离合器后，发动机输出轴上的飞轮，与离合器的摩擦盘紧紧压在一起，在离合器这个环节上，发动机动力扭矩的传动比是1。这与自动档液压离合器同样工况下的情况基本一致，但是，由于手动档的总减速比大于手动档的总减速比，所以，正常工况下，手动档的最终输出扭矩应该大于自动档的。

在“非正常”工况下，地板油，或深踩油门，应该认为，无论自动档或手动档，发动机本身的输出动力扭矩是一样的，但是，由于自动档与手动档在离合器环节的减速传动比是不同的，手动档为1（进入变速器之前没有减速，发动机的飞轮与离合器的摩擦盘联动贴压在一起，1比1传动），而自动档液压离合器（液力变矩器）的减速比却可以是2～3，由于这个扭矩大幅度放大因素的存在，尽管自动档变速器的“变速箱传动比×分动比×主减速比”要小于手动档的，最终输出扭矩仍然是自动档的要比手动档的大的多？？？！！！

简而言之，换一句话说，就是：地板油的“非正常”工况下，自动档最终输出到轮毂上的扭矩要显著大于手动档的！

哦，天哪，我的手动档信念快要彻底动摇了！

一定要手动，这个车买自动，修起来也麻烦。
越野车就要简单点好

沙漠之箭兄，我把文字部分转贴过来了。图片就挑的上了几个，不知道如何上多个图。喜欢车，了解车的工作原理，对合理用车和安全用车很有帮助。推荐你有空到那个网站看看，很详细，另外图文并茂。

http://auto_howstuffworks_com/torque-converter2.htm

Inside a Torque ConverterCheck it Out!
Watch a three-minute movie of Marshall Brain explaining how the torque converter works!

As shown in the figure below, there are four components inside the very strong housing of the torque converter:
Pump
Turbine
Stator
Transmission fluid

The parts of a torque converter (left to right): turbine, stator, pump

The housing of the torque converter is bolted to the flywheel of the engine, so it turns at whatever speed the engine is running at. The fins that make up the pump of the torque converter are attached to the housing, so they also turn at the same speed as the engine. The cutaway below shows how everything is connected inside the torque converter.

How the parts of the torque converter connect to the transmission and engine

The pump inside a torque converter is a type of centrifugal pump. As it spins, fluid is flung to the outside, much as the spin cycle of a washing machine flings water and clothes to the outside of the wash tub. As fluid is flung to the outside, a vacuum is created that draws more fluid in at the center.

The pump section of the torque converter
is attached to the housing.

The fluid then enters the blades of the turbine, which is connected to the transmission. The turbine causes the transmission to spin, which basically moves your car. You can see in the graphic below that the blades of the turbine are curved. This means that the fluid, which enters the turbine from the outside, has to change direction before it exits the center of the turbine. It is this directional change that causes the turbine to spin.

The torque converter turbine: Note the spline in the middle. This is where it connects to the transmission.

In order to change the direction of a moving object, you must apply a force to that object -- it doesn't matter if the object is a car or a drop of fluid. And whatever applies the force that causes the object to turn must also feel that force, but in the opposite direction. So as the turbine causes the fluid to change direction, the fluid causes the turbine to spin.

The fluid exits the turbine at the center, moving in a different direction than when it entered. If you look at the arrows in the figure above, you can see that the fluid exits the turbine moving opposite the direction that the pump (and engine) are turning. If the fluid were allowed to hit the pump, it would slow the engine down, wasting power. This is why a torque converter has a stator.

The stator sends the fluid returning from the turbine to the pump. This improves the efficiency of the torque converter. Note the spline, which is connected to a one-way clutch inside the stator.

The stator resides in the very center of the torque converter. Its job is to redirect the fluid returning from the turbine before it hits the pump again. This dramatically increases the efficiency of the torque converter.

The stator has a very aggressive blade design that almost completely reverses the direction of the fluid. A one-way clutch (inside the stator) connects the stator to a fixed shaft in the transmission (the direction that the clutch allows the stator to spin is noted in the figure above). Because of this arrangement, the stator cannot spin with the fluid -- it can spin only in the opposite direction, forcing the fluid to change direction as it hits the stator blades.

Something a little bit tricky happens when the car gets moving. There is a point, around 40 mph (64 kph), at which both the pump and the turbine are spinning at almost the same speed (the pump always spins slightly faster). At this point, the fluid returns from the turbine, entering the pump already moving in the same direction as the pump, so the stator is not needed.

Even though the turbine changes the direction of the fluid and flings it out the back, the fluid still ends up moving in the direction that the turbine is spinning because the turbine is spinning faster in one direction than the fluid is being pumped in the other direction. If you were standing in the back of a pickup moving at 60 mph, and you threw a ball out the back of that pickup at 40 mph, the ball would still be going forward at 20 mph. This is similar to what happens in the turbine: The fluid is being flung out the back in one direction, but not as fast as it was going to start with in the other direction.

At these speeds, the fluid actually strikes the back sides of the stator blades, causing the stator to freewheel on its one-way clutch so it doesn't hinder the fluid moving through it.

http://auto_howstuffworks_com/torque-converter.htm

Main > Auto > Under the Hood

How Torque Converters Work
by Karim Nice

Inside This Article
1. Introduction to How Torque Converters Work

2. The Basics

3. Inside a Torque Converter

4. Benefits and Weak Points

5. Lots More Information

6. See all Under the Hood articles

Torque converters make automatic transmission possible. See more torque converter images.

If you've read about manual transmissions, you know that an engine is connected to a transmission by way of a clutch. Without this connection, a car would not be able to come to a complete stop without killing the engine. But cars with an automatic transmission have no clutch that disconnects the transmission from the engine. Instead, they use an amazing device called a torque converter. It may not look like much, but there are some very interesting things going on inside.

In this article, we'll learn why automatic transmission cars need a torque converter, how a torque converter works and what some of its benefits and shortcomings are.

一棒子打死

买自动的就对了，虽然只有4前速，但是感觉上，比手动档的高档许多。
传动比上的那点儿差别实际上感觉应该不明显，厂家考虑的一定比用户更多，买手动档无非是为了省钱，至于驾驶乐趣，反正我是从来没有感觉到开手动档还有啥乐趣。

还有，输出扭矩放大2～3倍，是个什么样的工作机理啊？

总减速比＝变速箱传动比×分动比×主减速比，这个公式还能够适用吗？

自动档的液压离合器可以放大扭矩，特别是车速低而发动机转速高时。
http://auto_howstuffworks_com/torque-converter3.htm

Benefits and Weak Points
In addition to the very important job of allowing your car come to a complete stop without stalling the engine, the torque converter actually gives your car more torque when you accelerate out of a stop. Modern torque converters can multiply the torque of the engine by two to three times. This effect only happens when the engine is turning much faster than the transmission.

今天在街上看到2辆，确实不错，就是小。用来玩是不错，家庭用就免了。