How does a traction drive work?

Traction drives work by using normal force to generate usable rotational torque via multi viscosity traction fluids. These fluids while under pressure temporarily become a solid preventing metal to metal contact while also distributing the pressure at the contact patch as well as transferring of torque.

What are the advantages of traction drives?

Advantages of Electric Traction Drives

Due to high starting torque, it is possible to produce high acceleration rates. Electric locomotives require less maintenance compared to other drives. Supply of power to the locomotive is easier through the traction substations.

What gears are used in traction drives?

The main planetary gear set, connected directly to the motor shaft has a sun gear with 25 teeth, dual planets with 20 and 21 teeth (from sun to ring respectively), and a ring gear with 76 teeth.

What is a traction drive belt?

Description. Traction drive belts provide power to drive the wheels. John Deere belts contain strong material to prevent stretching and roll over which provides smooth engagement and consistent power.

How do you adjust a belt on a John Deere Drive?

Loosen the center bolt on the transmission drive belt idler arm, but do not remove it. Holding the top of the center bolt-head with the combination wrench while loosening the retaining nut on the underside with a socket wrench is the next task. Push the idler arm forward to align the adjustment bolt holes.

Basics of traction motor drive

Are locomotives AC or DC?

Modern AC locomotives tend to have better traction and offer better adhesive to the tracks than earlier models. AC diesel-electric trains are most commonly used for carrying heavier loads. However, DC diesel-electric trains are still very popular as they are relatively cheaper to manufacture.

Why DC is used in traction?

DC series motor has develops high torque at low speeds, low torque at high speed, this is the basic requirement of traction unit. Commutating property of series motor is good so we get sparkles commutation. Torque is unaffected by variation in supply voltage. DC Series motor maintenance cost is less.

Can a single phase motor be used for traction?

The torque-speed characteristic of the single phase series motor is similar to that of the dc series motor i.e., high starting torque and decrease in speed with increase in load making it to have self-relieving property from heavy excessive load, so such a machine is particularly useful for traction services.

What is a worm gear reducer?

A worm gear reducer is a right angle speed reducer that allows the maximum speed reduction in the smallest package. Worm gear reducers are used in low to moderate horsepower applications. They offer low initial cost, high ratios, and high output torque in a small package.

What is a traction motor on a train?

Traction motors are powered by electricity and generate the power to rotate the wheels of the train. The turning force produced by traction motors is transmitted to the wheels via the driving gear unit and axle. Traction motors are typically mounted in the trucks where the wheels are housed.

What are the disadvantages of traction?

What are the disadvantages of diesel electric traction?

What are the requirements of an ideal traction system?

Ideal traction system should have capability of developing high tractive effort in order to have rapid acceleration. The speed control of the traction motors should be easy. Vehicles should be able to run on any route, without interruption. Equipment required for traction systems should be minimum with high efficiency.

How do locomotives get traction?

Trains get traction because of the immense weight of the locomotives, and the friction generated between the wheel and rail head. Furthermore, in less than ideal weather conditions, sand is sprayed on the rail head to reduce wheel slip.

What voltage do locomotives use?

Batteries. The locomotive operates on a nominal 64-volt electrical system. The locomotive has eight 8-volt batteries, each weighing over 300 pounds (136 kilograms). These batteries provide the power needed to start the engine (it has a huge starter motor), as well as to run the electronics in the locomotive.

Do trains have AC?

When the weather outside is less than balmy, why do we still need to blast the A/C on our buses and trains? The main reason is because buses and trains are enclosed spaces, so the HVAC (heating, ventilation and air conditioning) system has to be kept on to ensure proper air circulation for everyone on board.

Why train engines are not turned off?

Trains, being large and heavy, need the optimal brake line pressure for its efficient stopping. For obvious reasons, loco pilots never compromise on brake line pressure. Another reason for not turning off diesel train engines, lies in the engine itself.

How much electricity does a train use?

All mainline electrified routes in India use 25 kV AC overhead electrification at 50 Hz. As of March 2017, Indian Railways haul 85% of freight and passenger traffic with electric locomotives and 45,881 km of railway lines have been electrified.

How do freight trains pull very heavy loads?

How Does A Train Pull So Much Weight? There is a large engine in the train. The wheels turn to pull the rest of the cars when this engine is running. In the case of the train and wheels, the static friction force between the wheels and the rail is what changes the train's momentum.

Why does my riding mower keep throwing the belt?

A riding mower belt can come off your mower when brackets, belt keepers or idler spring are worn or damaged; your bearings are bad in your pulleys or spindle housings; or debris is interfering with the tension of your deck belt.

Why does my John Deere belt keep breaking?

A common cause of belt breakage is excessive grass clippings on the deck. Grass clippings can work their way under pulleys and deck covers, causing series problems. Make sure to clean off your deck after every mower use and follow manufacturer recommendations.

How tight should a deck belt be?

Roughly, starting out about as tight as an alternator belt, maybe an inch of play side to side… So, tight but not super tight, hard to explain it just takes practice. Too tight is no good, I find if it's tight enough where it doesn't slap around at all then it's also too tight, ain't life grand.