What Does a Transmission Do, Anyway?

What Does a Transmission Do, Anyway?At Key Transmission and Gears, our business is transmissions. But you might be wondering what does a transmission do, anyway? You may not want to become a car engine expert, and that’s okay, but it is a good idea to have a little bit of an idea of how things work in your own vehicle. That way you are more likely to notice when something is not quite right and know when to take it to a professional before a small problem gets out of hand and becomes a massive repair.

The transmission has a vital function in your car’s engine. So, when your transmission stops working, your car stops moving – period. All the parts of the engine cooperate to create a great force, but that force is variable and uncontrolled. If the engine were connected directly to the wheels, the wheels would not turn at a constant speed and your ride would get a little crazy.

Also, the power produced by the engine is too high for the wheels. An engine generally produces a rotational speed of 600-7000 RPM while wheels typically operate somewhere between 0-1800 RPM. That’s a pretty big difference, and obviously, your wheels simply cannot keep up with the engine in that way. Notice that the engine speed doesn’t go down to zero? That means you wouldn’t be able to ever stop fully. Not a good thing.

The transmission is the magical device that brings that speed down and regulates it appropriately. Well, maybe it’s more scientific than magical, but you get the idea. In order to perform this function, the transmission uses a series of gear ratios and components like the differential.

Gears are little wheels of varying sizes with grooves, or teeth, around the edges. The ratio comes into play when these gears are fitted together. Imagine a wheel with 40 teeth around the edge, now imagine a smaller one with only 20 teeth. Now fit these two together and imagine that the smaller one is connected to the drive shaft. It will rotate twice for every one rotation of the big wheel. See what happened there? The speed gets cut in half.

In this case, the ratio would be written as 0.5:1. This depicts how many times the output gear rotates in relation to the input gear.

Now, inside the transmission, there are quite a few different little wheels with different gear ratios. Depending on the speed that the vehicle is traveling, different ratios are required. If you’ve ever driven a manual, you’ll understand this a little better as you have to shift the gears yourself. With an automatic transmission, your vehicle still makes those shifts – you’re just less likely to notice.

That’s about it! The answer to what does a transmission do, anyway, turns out, isn’t that complicated. Although if you were to peek inside your transmission, it looks quite complex. That’s why trusted professionals like our staff at Key Transmission and Gears are so essential for the proper maintenance and repair of your vehicle’s transmission. Give us a call today and we will be happy to answer any questions that you may have and offer our expert advice.

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