Small output volume automobile engine chain timing system

Abstract

The invention relates to a small output volume automobile engine chain timing system. A high strength nylon chain wheel structure is adopted, contact between a chain and a chain wheel is changed into nylon-steel contact from steel-steel structure contact, kneading impact between the tooth-shaped chain and the chain wheel is greatly reduced, the NVH of the timing system is improved, and system motion is more stable and silent. According to the small output volume automobile engine chain timing system, an anti-attrition layer is additionally arranged on a guide rail, the friction coefficient is reduced, sliding friction force between a chain plate on an original chain and the guide rail is reduced, the system friction loss is reduced, and the engine fuel using rate is improved. A filter net used for filtering engine oil is additionally arranged in a tensioning device, impurities are prevented from entering the tensioning device, and major engine quality accidents caused by the timing system are avoided. Meanwhile, the manner that the guide rail is linked and fixed through a pin shaft is adopted, a traditional bolt installing and fixing manner is replaced, transverse abrasion of the guide rail is reduced, and the engine assembly efficiency is improved.

Description

technical field [0001] The invention relates to a device for an automobile engine acting on a timing belt or a chain, in particular to a small-displacement automobile engine chain timing system. Background technique [0002] The timing chain system of the automobile engine works in an environment with oil injection lubrication. The tensioner tensions the chain through the pressure of the engine oil. As the engine wears and ages, various impurities in the oil easily enter the tensioner, resulting in tension If the oil is not flushed in time, the tensioner will not respond in time, lose the tensioning effect, the vibration of the system will intensify, and even cause the chain to skip teeth, and the sequence of intake and exhaust will be disordered. In most cases, high-speed collision between the engine piston and the valve will occur. The engine will be destroyed in an instant. [0003] The chain and sprocket of the existing engine timing chain system are all made of steel. ...

AI Technical Summary

Problems solved by technology

[0002] The timing chain system of the automobile engine works in an environment with oil injection lubrication. The tensioner tensions the chain through the pressure of the engine oil. As the engine wears and ages, various impurities in the oil easily enter the tensioner, resulting in tension If the oil is not flushed in time, the tensioner will not respond in time, lose the tensioning effect, the vibration of the system will intensify, and even cause the chain to skip teeth, and the sequence of intake and exhaust will be disordered. In most cases, high-speed collision between the engine piston and the valve will occur. The engine will be destroyed in an instant

[0003] The chain and sprocket of the existing engine timing chain system are all made of steel. When the chain engages the sprocket at a very high speed, it will produce a lot of noise, which will deteriorate the NVH performance of the engine. This is why many engines still use belts. The reason is the timing system, but the timing belt has defects such as short service life and easy cracking. Therefore, if the noise of the chain drive system can be reduced, it can provide better support for the overall performance of the engine

[0004] Reducing the mechanical friction loss of the engine and improving the fuel utilization rate of the engine are important improvement directions for the design and manufacture of the engine. In order to reduce the vibration of the chain in the existing engine, it is necessary to add a guide rail to a certain part around the chain. However, due to the high-speed movement of the chain and There is friction between the guide rails, resulting in a large friction loss in the timing system, which is not conducive to improving the fuel efficiency of the engine

[0005] There are many parts that make up the timing system, and it is difficult to assemble. The assembly of the guide rails of the existing engine timing system is mostly bolted, and the assembly efficiency is low, which is not conducive to improving product production efficiency.

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