Car Transmission

An automatic transmission also known as “Auto transmission”. An auto transmission is an automobile gearbox that can change gear ratios automatically as the vehicle moves, freeing the driver from having to shift gears manually. Similar but larger devices are also used for heavy-duty commercial and industrial vehicles and equipment.

Most automatic transmissions have a set selection of possible gear ranges, often with a parking pawl feature that will lock the output shaft of the transmission. Continuously variable transmissions can change the ratios over a range rather than between set gear ratios. Continuously variable transmissions have been used for decades in two-wheeled scooters but have seen limited use in a few automobile models. Recently, however, CVT technology has gained greater acceptance among manufacturers and customers, especially in Nissan automobiles and gas-electric Hybrid vehicles.

Some machines with limited speed ranges or fixed engine speeds, such as some forklift trucks and lawn mowers, only use a torque converter to provide a variable gearing of the engine to the wheels.

The need for a transmission in an automobile is a consequence of the characteristics of the internal combustion engine. Engines typically operate over a range of 600 to about 7000 revolutions per minute although this varies, and is typically less for diesel engines, while the car’s wheels rotate between 0 rpm and around 1800 rpm.

The engine provides its highest torque outputs approximately in the middle of its range, while often the greatest torque is required when the vehicle is moving from rest or traveling slowly. Therefore, a system that transforms the engine’s output so that it can supply high torque at low speeds, but also operate at highway speeds with the motor still operating within its limits, is required. Transmissions perform this transformation




By: sara

There are many kinds of transmissions and depending on your car, you will have to use a certain one. What are these things and why do we really need them? Transmissions are broke down into two real categories, manual and automatic. These transmissions are what make the car run, so they are important to the overall health of the car.

An automatic transmission will vary from 2 speeds on up to a more common 4 speed or 5 speed automatic. A 3 speed auto transmission is really very simple. You have drive, low 1 or low 2. Most of the time you just shift into drive and go. You will need to look at the different auto parts that you will need with your transmission.

The more complex 4 and 5 speed automatic transmissions are used in many different vehicles today. These extra gears can be used for towing or just better fuel mileage going down the road. These transmissions will use an on board computer to help control.

Manual transmissions are not so common in your vehicles today, but you can still find some manufactures that use them. Most of the trucks that you find will have will use a manual transmission to help with the selection of lower gears for better towing. Again you will have to go to the local auto parts store and get the auto parts that you need for the transmission.

Most auto parts stores will carry parts to help maintain an auto transmission. This is not so true with a manual transmission.

A manual transmission must use a clutch disc and pressure plate to transfer the power from the engine to the transmission. These are mated or engaged from the clutch pedal. Most clutched either are cable operated or hydraulic and the slang term for these transmissions were once a stick shift. Some manual transmissions were even on the column of the vehicle.

There are many things that you need to consider when you are getting your transmission and you are looking at auto parts that go with the transmission. These are the things that will help to run your car and to help you when you are not sure as to what gear you need to be in. This is something that you need to think about when you are looking at transmissions because they can be very hard to get changed out if they are not right.




By: Victor Epand