Oil duct structure of VVT (variable valve timing) system

Abstract

The invention relates to the technical field of automotive VVT (variable valve timing) systems, in particular to an oil duct structure of a VVT system. The oil duct structure comprises a cam shaft phaser and an OCT (oil control valve), wherein the cam shaft phaser comprises a rotor and a stator, a plurality of pressure maintaining cavities are formed in the stator, uniformly distributed blades are arranged on the outer side of a base of the rotor and extend into the pressure maintaining cavities to divide the pressure maintaining cavities into feed angle pressure maintaining cavities and lag angle pressure maintaining cavities, the base of the rotor and the blades adopt an integrated structure, an outer circumferential surface of the base of the rotor and an inner circumferential surface of the stator are in non-damping attachment and in liquid sealing, and an outer circumferential surface of each blade and an inner circumferential surface of each pressure maintaining cavity are in non-damping attachment and in liquid sealing. The processing accuracy can be effectively improved by means of an integrated structure, meanwhile, assembling errors can be avoided, matched friction force between the rotor and the stator is reduced to the minimum, an additional sealing system is not required, and the service life is prolonged; hydraulic sealing overflowing is performed by the stator and the rotor through buffer matching of a buffer groove and a bulge, direct collision of the stator and the rotor is avoided, and mute operation is completely realized.

Description

technical field [0001] The invention belongs to the technical field of automobile VVT ​​systems, in particular to an oil passage structure of the VVT ​​system. Background technique [0002] When the engine is under different working conditions, the ECU of the car will control the action of the OCV valve, and the reversing rod inside the OCV valve will move forward and backward to change the oil passage. If the oil passage is different, a certain amount of oil will be introduced into the cam phase adjuster. There are blades between the rotor and the stator of the phase adjuster, which divides a chamber into two spaces. When the oil enters from one side, the timing will be advanced, and when the oil enters from the other side, the timing will be delayed. At the same time, the amount of engine oil entering the cam phase adjuster determines the variation of the valve timing. The engine system controls the change of the oil passage of the OCV valve to realize the advance or lag o...

AI Technical Summary

Problems solved by technology

[0005] In the prior art, the valve body of the OCV valve is usually provided with a three-way annular groove, and a radial through hole communicating with the inner cavity of the valve body is arranged in the groove, and a filter screen is covered in the groove, and the filter screen is usually made of a metal strip. They are connected end to end and welded into a complete annular filter screen. Therefore, when the OCV valve needs to be cleaned, it can only destroy the filter screen to make the radial through holes in the groove unobstructed, and then clean it; the existing defects are: 1 1. The filter screen is a consumable accessory; 2. The operation of cleaning the OCV valve is cumbersome

[0008] Among them, when the spool moves in the coil, the chambers on the upper and lower sides of the spool circulate air through the gap between the spool and the coil. The circulation effect is general and there is a certain resistance to the movement of the spool.

Moreover, the ejector rod is fixed in the through hole in the middle of the valve core. After a period of use, the ejector rod has a potential safety hazard of loosening (that is, the ejector rod is embedded deeper in the valve core), resulting in failure of the oil circuit switching mechanism.

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