Agritech products HS code classification

List of contents in this article:

• 1, What do you know about the pillars of automobile engines?
• 2, If the engine column of the car needs to be repaired, what are the symptoms?
• 3, What two types of uprights can be divided into in the engine gas distribution mechanism? Should we all keep it_Baidu...
• 4、 The function of the column?
• 5, The engine column of the car plays a great role. What is the working principle?

What do you know about the pillars of automobile engines?

The rod-camshaft friction pair is one of the most important friction pairs in diesel engines. Once the wetting is not good, the abnormal damage to the friction vice will lead to obvious common faults such as the inability to control the valve variable valve timing, and even the inability to open the valve and the inability to operate the diesel engine.

Struts can be divided into two categories: mechanical struts and hydraulic struts. In each category, there are many structural forms, such as flat uprights and liquid uprights. One end of the rod is in contact with the cam, and the other end is in contact with the valve. Its function is to transmit the thrust of the cam to the valve.

Generally speaking, the materials for making engine columns include carbon steel, diamond nickel-chromium alloy cast iron and cold pole alloy cast iron, etc. I hope everyone can recognize this.

When the engine is in idle, in the middle of the engine.A click will be heard on one side of the valve hydraulic rod. The sound law is not obvious. After increasing the engine speed, the sound weakens or becomes disordered, and disappears when driving at high speed. The cold car is more obvious, and the sound of the hot car gradually weakens. If the fire is cut off, the sound will still exist.

If the engine column of the car needs to be repaired, what are the symptoms?

1. Symptoms of hydraulic valve shaft breakage: abnormal valve noise in the early stage of engine start-up, and the valve has been abnormal noise during engine operation, and the abnormal sound of the valve changes with the change of engine temperature. The following is an analysis of the specific symptoms of valve hydraulic column failure.

2. The oil level of the engine oil is too high or too low, causing the oil with bubbles to enter the hydraulic column, forming an elastomer and producing the sound of the valve foot.(2) The oil pressure is too low, and there is a lack of lubricating oil in the hydraulic column, causing the air to enter the hydraulic column and produce the sound of the valve foot.

3. Abnormal sound will occur after the valve hydraulic roof column is broken, and the abnormal sound is the most serious in the cold state. During the idling operation of the engine, there will be a sound in the valve hydraulic pillar. This sound is very irregular and very obvious in the cold state. During high-speed driving, this abnormal sound will gradually disappear.

4. Symptoms of broken valve hydraulic toppost. After the valve hydraulic toppost is broken, there will be a strange sound. In the state of a cold car, the abnormal sound is the most serious. In the process of idling, the valve hydraulic top pillar will make a noise. This sound is very irregular. The car is very clear in the cold state. Show, in the process of high-speed driving.

What two types of uprights can be divided into in the engine gas distribution mechanism? Should it all be left with gas_Baidu...

1. The function of the valve column is to transmit the thrust of the cam to the putter or valve rod, and bear the lateral force applied when the camshaft rotates.The upright column can be divided into two types: ordinary upright column and hydraulic upright column. 1) Ordinary valve column. The column adopted by the valve overhead gas distribution mechanism has two structural forms: cylinder type and roller type, as shown in Figure 3. As shown in 21.

2. There are three forms of column: bacterial, cylinder and roller. The problem of loose valve closure caused by thermal expansion of the hydraulic column can be solved by reserving the valve gap. However, due to the existence of the valve gap, the gas distribution mechanism will produce an impact and make a noise when working.

3. The bar is used to transmit the thrust of the cam to the putter or valve, while also bearing the lateral force exerted by the cam and transmitting it to the engine cylinder block or cylinder head. Commonly used materials for uprights include medium-carbon steel, alloy steel, alloy cast iron and super-cooled cast iron. Ordinary supports are generally used for the gas distribution mechanism under or in the camshaft.

The function of the column?

The function of the upright column is to transmit the thrust of the cam to the putter or valve rod, push the putter or valve to overcome the action force of the valve spring to move, and at the same time bear the lateral force applied when the camshaft rotates.

One end of the rod is in contact with the cam, and the other end is in contact with the valve. Its function is to transmit the thrust of the cam to the valve.

The function of the upright is to transmit the thrust of the camshaft to the putter (or valve rod) and bear the lateral force applied when the camshaft rotates. The upright column is equipped with an adjustment screw at its top to adjust the valve clearance.

The engine column of the car plays a great role. What is the working principle?

1. With the operation of the engine, under the action of oil pressure, the plunger cavity in the upright is filled with oil, and the plunger moves downwards, which increases the effective working length of the upright and reduces the valve gap. Because the force generated by the plunger in the boom is very small, it cannot produce the force of the compression valve spring, so when the gap between the boom and the valve is very small, the boom will no longer move.

2. One end of the bar is in contact with the cam, and the other end is in contact with the valve. Its function is to transmit the thrust of the cam to the valve.

3. With the rotation of the engine, under the action of oil pressure, the plunger cavity in the column is filled with oil, and the plunger goes down, increasing the effective working length of the column and reducing the valve gap. Because the force generated by the plunger in the straightener is very small, it cannot cause the force of compressing the valve spring, so when the gap between the straightener and the valve is very small, the straightener does not move.

4. The engine hydraulic lever (column) is composed of column body, hydraulic cylinder, plunger, one-way ball valve, one-way valve spring and plunger return spring and other components. The outer cylindrical surface of the straight cylinder is processed with a circular oil groove, the inner side of the top is processed with a key-shaped oil groove, and the middle inner cylindrical surface is used to install the hydraulic cylinder.