Introduction to the characteristics of the camshaft

Introduction to the characteristics of the camshaft
The bottom-mounted camshaft generally uses a star gear set (the so-called "control wheel"), and the roller chain or rack is connected to the crankshaft. In order to control the noise, the larger diameter camshaft end drive wheel is generally made of plastic or light metal, while the relatively small diameter crankshaft end drive wheel is mostly made of steel.

Chain connections are also more common. This approach can be seen on both bottom-mounted and overhead camshafts. In order to reduce the noise (usually the "vibration noise" that occurs when the chain is in motion), a hydraulic pressing device and a guide rail for plastic materials are generally used.

In the overhead camshaft structure, it is more common to use a plastic rack chain connection. This rack chain sits outside the oil chamber of the suggested engine, and while it has steel inserts, it is tensioned by an adjustable roller.

There is also a structure that is now relatively rare due to excessive power loss and too messy during transmission. This configuration connects the overhead camshaft to the crankshaft through an eccentric connecting rod, a spider gear set, or a bevel gear set with a central shaft.

The common transmission methods between the camshaft and the crankshaft include gear transmission, chain transmission and toothed belt transmission. The transmission between the lower camshaft and the middle camshaft and the crankshaft is mostly driven by cylindrical timing gears. Generally, only one pair of china Cold shock camshaft blank Suppliers gears is required to drive from the crankshaft to the camshaft. If the diameter of the transmission gear is too large, an additional center can be added. Idler. In order to mesh smoothly and reduce operating noise, the timing gears are mostly helical gears.

Chain drive is commonly used between overhead camshaft and crankshaft, but its operational reliability and durability are not as good as gear drive. In recent years, toothed belts have been widely used to replace transmission chains on high-speed rotary machines, but chain drives are still used on some high-power rotary machines. The toothed tape has the characteristics of low operating noise, reliable operation and low cost. Regarding the double overhead camshaft, generally the exhaust camshaft is driven by the crankshaft through a timing toothed belt or chain, the intake camshaft is driven by the exhaust camshaft through a metal chain, or both the intake camshaft and the exhaust camshaft are driven by china Ductile iron camshaft blank Suppliers the crankshaft. Driven by the crankshaft via toothed belts or chains.

When installing the camshaft, pay attention to the timing symbol on the camshaft pulley or sprocket. Some suggested machines do not have obvious timing marks, and the repairman can mark the exact position of the crankshaft and camshaft before disassembling the camshaft, while some suggested machines require special tools to adjust the timing.