What role does the camshaft of a car play?
The camshaft is an important part of the engine. According to the number of camshafts, it can be divided into two types: single overhead camshaft and double overhead camshaft. So what role do they play in car engines? The editor has compiled some information about the role of car camshafts in car parts.
Single overhead camshaft
Single overhead camshaft uses a convex shaft on the cylinder head to directly drive the intake and exhaust valves. It has a simple structure and is suitable for high-speed engines. The side camshaft generally used in the past, that is, the camshaft is on the side of the cylinder, and is directly driven by a timing gear. In order to transform the rotation of the camshaft into the reciprocating movement of the valve, a valve lifter must be used to transmit power. In this way, there are many reciprocating parts, and the inertial mass is large, which is not conducive to the high-speed movement of the engine. Moreover, the slender tappet has a certain degree of elasticity, which is easy to cause vibration, accelerate the wear of parts, and even make the valve out of control.
Double overhead camshaft The overhead double camshaft is equipped with two camshafts on the cylinder head, one is used to drive the intake valve, the other is used to drive Exhaust valve. The use of double overhead camshafts does not require high design requirements for camshafts and valve springs. It is especially suitable for hemispherical combustion chambers with V-valve configuration, and is also convenient for use with four-valve valve trains.
Its function is to control the opening and closing of the valve. Although in a four-stroke engine, the speed of the camshaft is half of the crankshaft (, However, usually its speed is still very high, and it needs to bear a lot of torque, so the design of the camshaft has high requirements in terms of strength and support, and its material is generally special cast iron, and occasionally forgings are used. Due to the law of valve motion It is related to the power and operating characteristics of an engine, so the camshaft design occupies a very important position in the engine design process.
In simple terms, the camshaft of a car is It is an indispensable component in automobile parts to make the intake and exhaust of each cylinder of the engine work.
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