A timing chain system and its engine

Abstract

The invention relates to a timing chain system and an engine thereof. The timing chain system comprises an air inlet chain wheel, an exhaust chain wheel, a timing chain wheel, a timing chain guide rail, a hydraulic tensioner and timing chains surrounding the air inlet chain wheel, the exhaust chain wheel and the timing chain wheel, and further comprises guide blocks, channels, an oil supply chamber and an oil pipe, wherein the guide blocks are arranged at the two ends of the timing chain guide rail, the channels are arranged on the guide blocks, an input end of the oil supply chamber is connected with the hydraulic tensioner, and the oil pipe is connected with an output end of the oil supply chamber. The top surface of each guide block is an arc-shaped surface, grooves are formed in the top surfaces of the guide blocks, and the bottom surface of each groove is an arc-shaped surface. The joint of the bottom surface of each groove and the timing chain guide rail is in smooth transition,and the height difference between the highest point and the bottommost surface of each groove is 0.2mm to 0.3mm. According to the timing chain system and the engine thereof, and the timing chain can be fully lubricated, so that the effects of reducing abrasion, prolonging the service life and improving the movement precision can be achieved.

Description

technical field [0001] The invention relates to the technical field of vehicle engines, in particular to a timing chain system and its engine. Background technique [0002] With the continuous improvement of vehicle manufacturing technology and industrial development, the timing belts of some engines have been replaced by engine chains. Compared with traditional belt drives, the transmission of chain drives is reliable, durable and saves space. [0003] The chain timing system is composed of gears, chains and tensioning devices, among which the hydraulic tensioner can automatically adjust the tensioning force, so that the chain tension is consistent, the reliability is higher, and the use and maintenance costs of the engine are also reduced. Quite a lot. [0004] The timing chain has high strength and long service life, but it is noisy during operation and has high requirements for lubrication. When the oil supply is insufficient, the wear speed is fast. In the actual use ...

AI Technical Summary

Problems solved by technology

The fluidity of the engine oil is strong. When the chain stops rotating, the oil attached to it will flow back to the bottom of the engine, which will cause the timing chain to be unable to be lubricated when the engine is started. On the other hand, the timing chain is running at high speed. , the lubricating oil attached to its surface will be thrown away, and the lubrication effect at the exhaust sprocket and timing sprocket is relatively poor

When the lubrication effect of the timing chain is poor, the wear speed is fast, the movement noise is large, and the matching accuracy with the exhaust sprocket and the timing sprocket will also be reduced, resulting in asynchronous matching of the intake and exhaust of the engine

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