2024 Author: Erin Ralphs | [email protected]. Last modified: 2024-02-19 11:42
The gear ratio of any gearbox is one of its most important characteristics. It can be determined by the ratio of the number of teeth of the driving and driven gears.
The gear ratio of the gearbox is a very important indicator, for example, two absolutely identical gearboxes (of the same brand and model) can have different gear ratios, which makes them completely non-interchangeable. Therefore, experienced motorists advise: before buying or replacing a faulty gearbox, especially on a car with a drive to both axles, you must first determine the gear ratio of the gearbox.
Of course, if when buying a new or used gearbox, the former owner / seller cannot name the gear ratio, then it is better not to purchase it. After all, it would be very stupid to fill, for example, a car from a dispenser where the brand of fuel is not indicated. And the consequences of this mistake will be more significant than low-quality gasoline.
All arguments that the gearbox being sold is from a car with a similar engine are completely unconvincing, because:
- The meaning of this argument is similar to that which would be if you were told that the KamAZ gearbox for sale has the same color as your car.
- This is not a guarantee of the truth, but may be a deception or a mistake, while the seller has one goal - to sell the product faster.
There are several ways to determine the gear ratio of gearboxes. But first, it is better to consider the types of gearboxes that generally exist and are installed on various machines and mechanisms.
1. Cylindrical gearboxes. They are most often used in the mechanisms of hoisting machines, as well as in other areas of production, where the load mode is intermittent. They have high efficiency and long life.
2. Bevel gears. They have a more complex device than cylindrical ones. They have the best ratio of performance and compactness. They are used in crane structures.
3. Worm gearboxes. Designed to rotate between intersecting shafts, i.e. by means of a worm and an associated worm wheel. They are used in hoisting and transport machines, machine tools (mainly metal-cutting), as well as in trolleybuses. Pluses - smoothness of work and noiselessness. Cons - low efficiency and increased wear. And the gear ratio of the gearbox does not quite meet the necessary needs.
4. planetary gears. They have the lowest specific metal content, but a large load capacity.
5. wave gears. Mainly used in rocketspace or defense industry.
6. Combined gearboxes. This is the use of several types of gears in one housing.
The gear ratio of a car's gearbox can be determined in the following ways:
1. catalog method. This is the easiest way (it can be applied without leaving home), but not the most reliable. Determine by vehicle VIN. To do this, write off the number from the certificate of registration of the car. Then, in one of the online catalogs of auto parts stores, enter the number in the search bar and find detailed information about your car. After that, select the transmission and look for the gear ratio of the car's gearbox there.
2. "According to the nameplate." This is the easiest and most reliable way. On the gearbox housing there may be either an engraving or a sticker (nameplate) containing all the information about this gearbox.
3. Calculate. The most reliable way, however, is not suitable for cars. Of course, if you are not going to dismantle the bridge.
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