What are the effects of camshaft intake and exhaust installation

The camshaft is a component of a piston engine. Its function is to control the opening and closing action of the valves. Although the speed of the camshaft in a four-stroke engine is half that of the crankshaft (in a two-stroke engine the camshaft rotates at the same speed as the crankshaft), it usually still rotates at a high speed and needs to withstand a lot of torque, so the design requires a high degree of strength and support for the camshaft, and its material is generally high-quality alloy steel or alloy steel.

Since the law of valve motion is related to the power and operation characteristics of an engine, camshaft design plays a very important role in the engine design process.

Chinese name. Camshaft.

Foreign name. camshaft

Function. Controls the opening and closing of the valve.

Layout form. Bottom-mounted, mid-mounted, and top-mounted.

Areas of use. Piston engine.

Camshaft working conditions and materials.

Cam bearings are subjected to periodic shock loads. The contact stress between the cam and the tappet is very large, and the relative sliding speed is also high, so the wear of the cam working surface is more serious. In view of this situation, the camshaft journal and cam working surface should have high wear resistance and good lubrication in addition to high dimensional accuracy, small surface roughness and sufficient stiffness.

Camshafts are usually forged from high-quality carbon or alloy steel, and can also be cast in alloy cast iron or ductile iron. The journal and cam working surfaces are heat-treated and polished. [1]

Structure. The main body of the camshaft is a cylindrical rod body of approximately the same length as the cylinder block. It is covered with several cams that are used to actuate the valves.

The camshaft is supported in the camshaft bearing bore by the camshaft journal, so the number of camshaft journals is an important factor affecting the camshaft support stiffness. If the camshaft stiffness is insufficient, bending deformation will occur during operation, which will affect the timing of the gas valve.

The sides of the cam are egg-shaped. It is designed to ensure adequate intake and exhaust of the cylinder. In addition, considering the durability of the engine and the smooth operation, the valve should not have too much impact due to the acceleration and deceleration process during the opening and closing action, otherwise it will cause serious wear of the valve, increase noise or other serious consequences.

Therefore, the cam is directly related to the power and torque output of the engine, as well as the smoothness of the operation.

Camshaft position.

There are three types of camshaft positions: bottom-mounted, mid-mounted, and top-mounted. The camshaft of the downward valve is located in the crankcase, the camshaft of the mid-mounted valve is located in the upper part of the body, and the camshaft of the upper valve is located on the cylinder head.

Most production cars now have engines equipped with overhead camshafts. The main advantages of the overhead camshaft structure are that there are few moving parts, the transmission chain is short, and the stiffness of the whole mechanism is large, which makes the camshaft closer to the valve, and reduces the waste of round-trip kinetic energy caused by the large distance between the camshaft and the valve. The engine of the overhead camshaft has a higher speed and better running smoothness due to the rapid opening and closing of the valves.

The engine is scrapped, and the valve top piston. Thank you!

You can distinguish between the position of the screw on the cam and the position of the belt. The intake camshaft is usually equipped with a camshaft position sensor behind or in front, so it will be long, or there is a signal generation disc at the tail, if it can't be distinguished, it doesn't matter, you can make a mark when dismantling, and you can basically distinguish it.

The exhaust cam has the word E or EX in English letters. Common transmission methods between camshafts and crankshafts include gear drives, chain drives, and toothed belt drives.

Camshaft position.

The camshaft is mounted on top of the cylinder head and is used to open and close the intake and exhaust valves.

Both the intake and exhaust camshafts are hung with a transmission wheel, which is directly driven by a chain or belt to rotate. Some engines use a chain drive to drive the camshaft in order to reduce the valve angle.

After finding the intake and exhaust pipes, the vertical position of the intake pipe is the intake valve; The vertical of the exhaust pipe is the exhaust valve.

If I open the camshaft cover. The one with the large valve clearance is the exhaust valve and the one with the small valve clearance is the intake valve. If there are 4 or 2 valves in a cylinder, the large one is the intake air and the small one is the exhaust.

If a cylinder has 5 valves, 3 small intakes, 2 large exhausts. For example, Jetta 5V.

The function of the valve is to draw air into the engine and mix it with fuel for combustion; The function of the exhaust valve is to exhaust the exhaust gases after combustion and dissipate heat. Valve clearance clearance is too large: after the intake and exhaust valves are opened late, the intake and exhaust time is shortened, the opening height of the valve is reduced, the normal valve phase is changed, and the engine power decreases due to insufficient intake and unclean exhaust, in addition, the impact of the valve mechanism parts is increased and the wear is accelerated.

The clearance is too small: after the engine works, the parts are heated and expanded, pushing the valve open, so that the valve is not closed tightly, resulting in air leakage, power drop, and serious carbon accumulation or burnout on the sealing surface of the valve, and even the valve hits the piston. The valve train with hydraulic tappets does not require valve clearance.

The role and principle of the camshaft position sensor.

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Camshaft position sensor is a sensing device, also known as synchronous signal sensor, it is a cylinder discriminating positioning device, input camshaft position signal to ECU, is the main control signal of ignition control.

The Camshaft Position Sensor (CPS) is used to collect the camshaft motion angle signal and input it into the electronic control unit (ECU) to determine the ignition time and fuel injection time. Camshaft position sensor (CPS) is also known as cylinder identification sensor (CIS), in order to distinguish it from crankshaft position sensor (CPS), camshaft position sensor is generally represented by CIS. The function of the camshaft position sensor is to collect the position signal of the valve camshaft and input it into the ECU, so that the ECU can identify the top dead center of cylinder 1 compression, so as to carry out sequential fuel injection control, ignition time control and deflagration control.

In addition, the camshaft position signal is used to identify the first moment of ignition when the engine is started. Because the camshaft position sensor is able to identify which cylinder piston is about to reach the top dead center, it is called a cylinder recognition sensor.

Look at the letters on the camshaft Intake no exhaust black.

Closer to the side of the intake duct is the inlet shaft and closer to the exhaust side is the exhaust shaft.

Double camshaft is a common automobile engine structure, which includes an intake camshaft and an exhaust camshaft. The distinction between intake camshafts and exhaust camshafts is very important, because they control the intake and exhaust process of the engine, and if installed incorrectly, it will lead to a decrease in engine performance or even failure.

First of all, we can distinguish between intake and exhaust camshafts by looking at the shape of the camshaft. The protrusions on the intake camshaft are usually larger and more rounded than those on the exhaust camshaft, and this is because the intake valve requires more space to take in the air, while the exhaust valve requires less space to vent the exhaust gases. In addition, intake camshafts are typically longer than exhaust camshafts because the intake valve takes longer to open in order to get enough gas into the cylinder.

Secondly, we can determine their type by looking at the markings on the camshafts. Intake camshafts are usually labeled "in" or "int", while exhaust camshafts are usually labeled "EX" or "EXT". These markings are usually located at the end or side of the camshaft.

Finally, we can determine the type of camshaft by looking at the technical manual of the car's engine or consulting a professional. Technical manuals often include detailed specifications and parts lists for the engine that can help us determine which camshaft attack is the intake camshaft and which is the exhaust camshaft. If we are unsure about the scrambler, it is best to consult a professional to ensure the proper operation of the engine.

In conclusion, it is very important to distinguish between the intake and exhaust camshafts of the double camshafts, which can be determined by looking at the shape of the camshaft, looking at the markings on the camshafts, and consulting the technical manual. Proper installation of the camshaft helps keep the engine up and running, improving the performance and reliability of the car.

The exhaust camshaft is not replaced properly, which affects the intake camshaft. Camshaft wear will cause the valve opening to become smaller, resulting in smaller intake and exhaust volume, of course, it will affect the power, camshaft wear is generally due to the poor quality of the camshaft itself, poor oil lubrication or poor oil, valve clearance is too small or long-term use of natural wear and tear, etc., serious fuel cam wear will lead to high-pressure oil pump stroke and timing changes, generally reflected in the oil supply Wang Jing strain slow, the first time is shortened, and the serious slag Qing leads to high exhaust temperature.

The role of the camshaftThe camshaft is the key component that drives the valve movement, and it controls and regulates the operation of the valve. The camshaft, also known as the peach shaft or eccentric shaft, is the driving part in the valve train because its cross-sectional shape is similar to a peach, which is specially designed to drive the valve to open and close on time. The camshaft structure of various models of engines is similar, the main difference is the location of installation, and the number and shape and size of the convex grip wheel are also different.