Camshafts are indispensable and very important in auto parts. They are divided into single overhead camshafts and double overhead camshafts! So what is the difference between these two? Here is a small editor for everyone; let's briefly introduce it.
Single overhead camshaft
Single overhead
Engine Camshaft For Mercedes Benz The shaft is a design in which only one camshaft is installed in the cylinder head. The in-line cylinder engine that can adopt this design only needs a camshaft placed above the cylinder head. In the single overhead Engine Camshaft For Mercedes Benz design, the parts that need to reciprocate and their total mass will be significantly reduced compared to a push rod engine under the same conditions. Therefore, the single overhead camshaft can effectively increase the engine speed, thereby increasing the power output of the engine under the same output torque. In this design, the camshaft can control the opening and closing of the valve directly or through a rocker arm. It does not need to be like an overhead valve push rod engine, which requires a tappet, a longer push rod and a rocker arm to move the engine into the engine block. The movement of the cam on the camshaft is transmitted to the valve in the cylinder head.
Double overhead camshaft
Double overhead cam Shaft is a valve arrangement with two camshafts in the cylinder head. Two camshafts control the intake valve and exhaust valve respectively. Depending on the structure of the engine (mainly the difference in the arrangement of the cylinders), a general dual overhead camshaft automobile engine can have up to two to four camshafts. An engine with a dual overhead camshaft structure does not necessarily have more than two intake and exhaust valves, but if the valves of a multi-valve engine need to be directly driven (although generally driven by a tappet), then the dual overhead cam The shaft is essential. Not all dual overhead camshafts are multi-valve - before multi-valve technology became popular, two-valve engines were often equipped with two camshafts. But nowadays, dual overhead camshafts have been equated with multi-valve technology, because in almost all dual overhead camshaft engines, each cylinder has three to five valves.
The difference between single overhead camshaft and double overhead camshaft
The single camshaft has a simple mechanical structure, fewer problems, and greater torque at low speeds. The opening time of the intake and exhaust valves of a single camshaft is fixed, but the mechanical structure is simple, the maintenance is easy, and the economy and fuel saving are the advantages of the single convex. The dual camshaft can change the valve overlap angle, so it can exert a relatively large horsepower, but the low-speed torque is relatively insufficient, and the complexity of the mechanical structure will cause certain difficulties in maintenance. The dual camshaft technology comes from racing cars, mainly to control the time difference between the intake valve and the exhaust valve. The single camshaft has a simple mechanical structure, fewer problems, and greater torque at low speeds. The opening time of the intake and exhaust valves of a single camshaft is fixed, but the mechanical structure is simple, the maintenance is easy, and the economy and fuel saving are the advantages of the single convex. The dual camshaft can change the valve overlap angle, so it can exert a relatively large horsepower, but the low-speed torque is relatively insufficient, and the complexity of the mechanical structure will cause certain difficulties in maintenance. The dual camshaft technology comes from racing cars, mainly to control the time difference between the intake valve and the exhaust valve. The camshaft installation position of the engine has three types: down-mounted, middle-mounted, and top-mounted. Due to the fast speed of the car engine, the speed can reach more than 5000 revolutions per minute. In order to ensure the efficiency of intake and exhaust, the intake and exhaust valves are inverted, that is, the overhead valve device. This kind of device is suitable for the three installation forms of camshaft. However, if a down-mounted or mid-mounted camshaft is used, due to the long distance between the valve and the camshaft, auxiliary parts such as valve lifters and tappets are required, resulting in many valve transmission parts, complex structure, large engine volume, and It is also easy to produce noise under high-speed operation, and the use of overhead camshaft can change this phenomenon. Therefore, modern car engines generally use overhead camshafts. The camshaft is arranged above the engine, which shortens the distance between the camshaft and the valve, omits the valve tappets and tappets, and simplifies the camshaft to the valve. Between the transmission mechanism, the structure of the engine becomes more compact. More importantly, this installation method can reduce the quality of the reciprocating movement of the entire system and improve the transmission efficiency. According to the number of camshafts, it can be divided into single overhead camshaft (SOHC) and double overhead camshaft (DOHC). Since mid-to-high-end car engines are generally arranged with multiple valves and V-cylinders, dual camshafts are required. The intake and exhaust valves are controlled separately, so the dual overhead camshaft is adopted by many engines.
Single convexity and double convexity are not so-called absolute good or bad, but the structure is different.
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