HVAC equipment HS code mapping

List of the table of contents of this article:

• 1,HVAC equipment HS code mapping How to install the piston ring of the car engine?
• 2, What is the shape structure of the engine piston, why Design like this
• 3, What parts does the piston consist of? What is its function?
• 4. How to judge the engine knock cylinder, solve
• 5, What are the names of each part of the engine?

How to install the piston ring of the car engine?

Use a special fixture. If there is no specialWith a fixture, you can also properly open the piston ring with two thumbs, protect the periphery of the ring with the other four fingers, carefully put the ring into the piston ring groove, and pay attention to the structure and installation direction of each ring. The distortion ring should distinguish between positive and negative.

The installation method of the engine piston ring is from the bottom up. Start from the oil ring at the bottom, and then install the second gas ring and the first gas ring on the top. The opening and direction of the piston ring must be installed correctly to ensure the normal operation of the engine. Generally, the side with letters or numbers is the front, which should be installed facing up.

The installation method of the engine piston ring is as follows: install from the bottom to the top, first install the bottom oil ring, and then install the third air ring, the second air ring and the first air ring in order. There are three piston rings, namely the first air ring, the second air ring and the third air ring.

Use a special fixture. If there is no special fixture, you can also use your thumbs to properly open the piston ring port. The remaining four fingers protect the ring and carefully put the ring into the piston ring groove, while paying attention to the structure and installation direction of each ring.

The assembly of the engine piston ring needs to ensure the cleanliness of the piston ring groove, otherwise it will cause the piston ring to be stuck, resulting in excessive wear or breakage. The specific operation steps are as follows: clean the ring groove of the piston. Soften the lubricating oil in the ring groove of the piston. Install the oil scraper ring of the piston. Install the upper and lower scrapers of the oil scraper ring.

What is the shape structure of the engine piston and why is it designed like this

1. The shape of the piston isCylindrical, there are many surface shapes. Generally, there are grooves on the surface. In order to facilitate the opening of the valve, the surface has a special shape to make the fuel better mixed. Different engine piston surfaces have different shapes, and the ultimate goal is to make the mixed gas more fully mixed and the internal convection of the engine stronger.

2. When the engine is working, due to the action of the gas pressure in the cylinder, the piston will be bent and deformed. After the piston is heated, due to the large amount of metal in the piston pin, its expansion is greater than that of other places. In addition, the piston will also produce squeezing deformation under the action of lateral pressure.

3. In order to reduce the inertia force of J, reduce the thermal deformation near the pin seat, and form a drag plate piston or a short piston. The drag plate structure skirt has good elasticity, small mass, and a small gap between the piston and the cylinder, which is suitable for high-speed engines.

4. The piston skirt refers to the lower part of the piston. Its function is to try to maintain the vertical posture of the piston in reciprocating movement, that is, the guiding part of the piston.

5. The top of the piston is generally elliptical, and the position of the piston pin is relatively narrow. The reason is that there is a lot of metal, which makes it easy for the piston to expand into a circle under heat. The piston is generally small at the top and large at the bottom. The head is subjected to more heat. The expansion rate is a little higher, and it can be expanded to the same size as the top and bottom.

What parts does the piston consist of? What is its function?

The piston of a car engine is generally divided into three parts: the top, the head and the hip. The piston head refers to the part above the piston ring groove, which is mainly used to install the piston ring to achieve the sealing of the cylinder.

The main function of the piston is to withstand the combustion pressure in the cylinder and transmit this force to the crankshaft through the piston pin and connecting rod. The basic structure of the piston can be divided into top, head and skirt. The piston also forms a combustion chamber with the cylinder head and cylinder wall.

The piston can be divided into three parts: top, middle and bottom. The top of the piston: The top of the piston is the first part of the piston and the part closest to the combustion chamber.It is usually designed with a pit or groove to install the piston ring and prevent oil from entering the combustion chamber.

The piston consists of three parts, the top, the head and the skirt. The piston is generally made of aluminum alloy die-casting, and the basic shape is a cylinder with a gradually increasing diameter from top to bottom. The top of the piston is the lower bottom of the combustion chamber, which is under the pressure of high-temperature gas. Its shape is related to the combustion chamber.

The basic structure of the piston can be divided into three parts: the head, the skirt and the piston pin seat. The piston is a mechanical part that moves back and forth along the axis of the cylinder block in the cylinder of machinery such as resurrected internal combustion engines, compressors and pumps. There are three forms of pistons: disc-shaped, cylindrical and cylindrical.

How to judge the engine knock cylinder, solution

Generally speaking, the abnormal sound of the piston and the knocking cylinder can be judged by the temperature, the fire break test, and the endoscope. In a word, only by combining several methods can we make accurate judgments, otherwise it is very easy to make mistakes.

Engine cylinder burst judgment method: - When the engine is running at idle or at low speed, the abnormal sound is clear; when running at medium speed and above, the abnormal sound weakens or disappears. - As the load increases, the noise also increases. - In general, the noise is obvious when the car is cold; when it is hot, the noise decreases or disappears, that is, knocking the cylinder cold, strict When it is heavy, it is cold and hot, accompanied by vibration.

Method 2: Remove the spark plug, inject oil into the cylinder, and start the engine again. If the noise decreases or disappears, but the noise appears again after a few minutes, it is a knocking cylinder.Method 3: Use a trombone screwdriver to measure the hearing. If there is a continuous "click" sound, it is knocking on the cylinder.

What are the names of each part of the engine?

The names of engine components are: engine cylinder block, crank connecting rod mechanism, gas distribution mechanism and intake and exhaust system, oil supply system and speed controller, starter, cooling system and lubrication system, a total of seven components.

Engine body group structure diagram and name The engine body group is mainly composed of cylinder head, cylinder pad, cylinder body, oil span shell, cylinder head cover and main bearing cover. The main body of the cylinder block engine is the whole engine support skeleton, which connects the installation piston, crankshaft and other parts and accessories.

Lifan three-wheeled motorcycle enginesSome names are cylinder block, crankshaft, air intake, exhaust pipe, flywheel, ignition system, oil pump and cooling system. Cylinder block: It contains cylinder, valve, piston and other components, which generate power through fuel combustion. Crankshaft: used to convert the linear motion of the piston into rotational motion.