The action of the intake valve.
The role of the valve is specifically responsible for the input of air into the engine and exhaust the exhaust gas after combustion. From the engine structure, it is divided into intake valve and exhaust valve. The role of the intake valve is to draw air into the engine and mix it with the fuel to burn; The function of the exhaust valve is to discharge the exhaust gas after combustion and dissipate heat.
Composition: The valve is composed of the valve head and the rod. The valve head temperature is very high (intake valve 570~670K, exhaust valve 1050~1200K), but also withstand the pressure of the gas, the valve spring force and the transmission component inertia force, its lubrication, cooling conditions are poor, requiring the valve must have a certain strength, stiffness, heat and wear resistance. The intake valve is generally made of alloy steel (chromium steel, nickel-chromium steel), and the exhaust valve is made of heat-resistant alloy (silicon chromium steel). Sometimes in order to save heat resistant alloy, the exhaust valve head is made of heat resistant alloy, and the rod is made of chromium steel, and then the two are welded together.
The shape of the valve head has a flat top, a spherical top and a horn top. Usually a flat top is used. The flat-top valve head has the advantages of simple structure, convenient manufacture, small heat absorption area, small mass, and can be used for inlet and exhaust valves. The spherical top valve is suitable for the exhaust valve, which has high strength, small exhaust resistance and good exhaust gas elimination effect, but it has a large heating area, large mass and inertia, and complex processing. The horn type has a certain streamline, which can reduce the intake resistance, but its head is heated by a large area, which is only suitable for the intake valve.
The valve rod is cylindrical, constantly reciprocating in the valve guide, and its surface must be superheated and polished. The shape of the end of the valve rod depends on the fixed form of the valve spring, the commonly used structure is two half lock pieces to fix the spring seat, the end of the valve rod has a ring groove to install the lock piece, some are fixed with the lock pin, and the end has a hole for installing the lock pin
Should the engine intake valve be cleaned?
In fact, all parts of the car have a regular cleaning, especially the heart of the car - the engine, if not cleaned, the carbon accumulation inside may reduce the engine power, increase the consumption of gasoline, and in serious cases will cause engine knock, acceleration abnormal sound, damage to the piston and crankshaft, and even eventually lead to the engine burning oil needs to be overhauled. Then the engine cleaning, the intake valve must be cleaned, the following is a brief talk about the intake valve cleaning
The cleaning of the intake valve, first of all, depends on how much carbon is deposited, and it is normal to accumulate carbon.
The car is generally more than 40,000 kilometers, it is necessary to consider carbon deposition cleaning, when the carbon deposition is almost obvious. Then the owner will ask how to check the carbon accumulation of the engine
How to check if the engine has carbon deposits
The method is simple. Wrap your finger in a white dinner towel
Inside the tail-end of the exhaust pipe, rub a circle hard, and look at the color of the paper to see if the engine system has carbon deposits.
This method can determine whether the combustion chamber, piston and ring carbon deposit in the engine cylinder is very serious.
1, the tail pipe no carbon: fingers wrapped in white napkins, hard to wipe the tail pipe port inside a circle, the paper only light yellow, indicating that the engine inside no carbon;
2, exhaust pipe floating carbon: the same method, found that the exhaust pipe has a little black carbon, gently pat the white napkin is left, the engine cylinder, piston, ring work is completely normal, there is a normal amount of floating carbon (also called carbon foam, not deposited).
3, exhaust pipe thick carbon: using the same method, found that the exhaust pipe is a lot of black carbon is very thick, after beating the white napkin, there is still a lot of carbon black on the paper, indicating that it is necessary to clean the combustion chamber, piston, ring carbon deposit;
4, exhaust pipe oil carbon: Using the same method, found that there is black carbon on the white napkin paper, and there are oil stains, indicating that the engine burns oil and needs to be repaired.
5, exhaust pipe oil carbon smoke: it can be determined that due to carbon accumulation and other reasons, the engine cylinder body wear is serious, the need for professional repair. Regular cleaning of the various parts of the car is good for the car itself, but also for their own safety and health. No matter how good the car is, it is necessary to maintain the car.
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