Why does the cart "fart" when it stops?

Every time a big car stops, it will be accompanied by fart, just like every time a car stops, it will hear the sound of a handbrake. If you are lucky enough to have been in a big truck, after careful observation, you will find that every time the truck puts P, it is after the driver stops the handbrake.

Because the handbrake of a cart usually uses air brake, simply speaking, it uses air as braking force, so it is normal to hear fart every time you stop, and you will often accidentally scare passers-by, haha!

For details about the principle of this brake, you can check it online. It is very clear, so I won't move bricks here!

This is very spiritual!

I remember when I was a child, this road was built in the east of the village. Every time the bus stops to get on or off passengers, I hear "poof!" The sound of "fart", commonly known as "fart", was especially fun when I was a child. You can hear the sound of "fart" coming from the east of the west village.

Later, I studied hard and asked questions ~

So I asked my dad, "Dad, why does the bus fart when it stops?"

My dad said, "Buses use air brakes, and farting is braking."

Ignorant, I knew it was a braking system from then on. Later, I learned how to drive.

My dad was right, it was "poof!" A loud noise is the brake sound of the cart, or rather, it should be the sound when the brakes are released.

The working principle is as follows:

The engine drives the air pump to compress air into high-pressure gas, which is stored in the air storage tank, one of which is connected with the brake master cylinder through a pipeline, and the brake master cylinder is divided into an upper air chamber and a lower air chamber, wherein the upper air chamber controls the rear wheel and the lower air chamber controls the front wheel. When the driver steps on the brake pedal, the upper air chamber is first opened, and the high-pressure gas in the air reservoir is delivered to the relay valve to push out the control piston of the relay valve. At this time, the gas in the other air reservoir is connected with the two rear brake cylinders through the relay valve, which pushes the brake cylinder push rod forward, pushes the cam to rotate at an angle and is eccentric, and at the same time, the brake shoe is opened, which generates friction with the brake hub to achieve the braking effect.

That's the parking brake of the cart, which is equivalent to the handbrake of our car.

For example. Due to the heavy weight of trolleys, air braking is generally used as a guarantee when parking. When the switch is pulled, the air in the brake system is exhausted, that is, the so-called fart sound, and the brake pad is firmly pressed on the hub by atmospheric pressure.

When we usually take the bus, do you find that the driver has a handle on his left hand side when waiting for the red light? When the car is stable, pull the handle, the car will fart, and then the driver can leave the brake steering wheel to relax. Similar to the following equipment.

The above personal feelings. Please check the comments for professional answers ~?

I never thought of this question. Ok, let me talk about it, because the cart is air-locked, and there will be such a sound anywhere where the brakes can be used. Not only will the handbrake ring when the car is stable, but it will also ring when you step on the brake during normal driving.

There is an air pump and two gas cylinders on the truck. When the air pressure in the cylinder is too low, the air pump will start to work and send air into the cylinder. When the air pressure in the cylinder reaches a certain pressure, it will make a "poof" sound, and then the air pump will stop working. When the gas in the gas cylinder is almost used, the air pump will continue to work, and the truck will use gas in normal braking, handbrake and clutch.

Explain it by hand in plain Chinese, and you should be able to understand it. thank you

This question is very interesting. How to fart after the big truck is stable? If you want to know how this fart came from, you must first figure out the braking system of the big truck. Let's talk about the fart of the big truck again.

I started repairing big trucks, and my favorite thing at that time was the fart of big trucks. I was curious, too. With the accumulation of time, I slowly figured out this fart.

There is a difference between air as a brake medium for trucks and oil as a brake medium for automobiles. To understand the fart of big trucks, we must first understand the parking device of big trucks, commonly known as air brakes. First of all, let's learn about the parking cylinder of the big truck.

A sub-pump, divided into two sets of braking systems, can be seen from the above marks how complicated its interior is. When our vehicle is running, the service brake chamber is airless, while the parking brake chamber is airless. There is a very large spring in the parking cavity, which is driven by air pressure. Otherwise, the vehicle will stop under the action of the spring, which is also the origin of the name of the air brake. Brake as soon as you run out of air.

Because the driving cavity needs a lot of air to restrain the force of the spring during the driving process. So when we want to stop, a lot of air pressure in the driver's cabin will be discharged quickly, so we can hear the fart of the big truck.

The big truck fart mentioned here is not real fart, but the sound produced by the rapid exhaust of air in the driver's cabin. I'm Toyoko, a car mechanic, from repairing trucks to repairing cars. I have gone through too many detours, but I still stick to this road of repairing cars. I read less and repair more cars. If I don't speak well, please give me more advice.

Wukong, are you a monkey after all? Is it because of its "red" sound that you call the sound of a cart discharging high-pressure gas from the brake pipe "fart"?

Automobile braking system that generates kinetic energy by air pressure is commonly known as "air brake". It consists of an air pump, an air storage tank, a master brake cylinder, a slave brake cylinder, pipelines, various booms, brake shoes (or plates) and brake drums (or disks).

When the car brakes, the driver steps on the brake pedal, and the pedal drives the brake valve of the brake master cylinder to open. At this time, the high-pressure gas in the air reservoir quickly reaches each brake cylinder through the pipeline and acts on the cup of the cylinder. Due to the pressure of high-pressure gas, the driven cylinder cup expands outward, driving the tappet at the other end of the driven cylinder to do work. The tappet rotates the roller through the brake adjusting arm, the roller and the camshaft connected to the brake drum. When they rotate to the convex position, the convex position lifts the brake shoes to make them work. When the driver releases the brake pedal after finishing the braking process, the high-pressure gas in these brake pipes can't return to the air storage tank due to low pressure (relative to the air storage tank pressure) or non-return raft, and can only be discharged to the outside (atmosphere). Because of the high pressure and fast discharge speed, it produces a red sound similar to fart.

It is stipulated that the parking brake of freight cars must use spring energy storage brake. Otherwise, vehicles parked for a long time cannot be guaranteed to be in a braking state. Then the parking brake must be released at the beginning of driving, which requires injecting compressed air to compress the spring to generate energy (energy storage). When parking, release the energy compressed by the spring to achieve the purpose of parking. Therefore, when the spring is released when parking, the air compressing the spring is released. Thereby generating exhaust sound (fart)!

When the vehicle is running, compressed air lifts the brake pad, and the brake pad leaves the brake disc. When braking is needed, compressed air leaks out, and the strong spring presses the brake pad against the brake disc to play a braking role. When the compressed air is released quickly, there is a fart-like air flow sound.