A cylinder head system oil circuit of an automobile engine

Abstract

The invention discloses a cylinder cover system oil line of an automobile engine. The cylinder cover system oil line of the automobile engine includes an air inlet VVT control oil line, an exhaust VVTcontrol oil line, an air inlet auxiliary oil passage, an exhaust auxiliary oil passage, an air inlet HLA oil passage and an exhaust HLA oil passage, wherein the air inlet auxiliary oil passage, the exhaust auxiliary oil passage, the air inlet HLA oil passage and the exhaust HLA oil passage are arranged on a cylinder cover; the cylinder cover system oil passage of the automobile engine further includes an air inlet main oil passage, an exhaust main oil passage and a high-pressure oil pump tappet lubricant oil line which is communicated with the exhaust HLA oil passage, wherein the air inlet main oil passage and the exhaust main oil passage are arranged on the cylinder cover, one end of the air inlet main oil line is communicated with a cylinder-body air inlet oil passage, the other end ofthe air inlet main oil line is communicated with the air inlet auxiliary oil passage, one end of the exhaust main oil passage is communicated with a cylinder-body exhaust oil passage, and the other end of the exhaust main oil passage is communicated with the exhaust auxiliary oil passage. By the adoption of the cylinder cover system oil line of the automobile engine, the situation can be avoided that oil pressure of an air inlet side and oil pressure of an exhaust side interact with each other, not only are the responsiveness of VVT and the responsiveness of HLA ensured, but also it is ensuredthat an air inlet camshaft, an exhaust camshaft and a high-pressure oil pump tappet are lubricant.

Description

technical field [0001] The invention belongs to the technical field of automobile engines, and in particular relates to an oil circuit of a cylinder head system of an automobile engine. Background technique [0002] In order to meet the increasingly stringent requirements of engines in terms of power, economy and emissions, it is urgent to upgrade the engines. More and more new technologies have been applied and promoted on automobile engines, such as VVT (Variable Valve Timing), HLA (Hydraulic Tappet) technology, and in-cylinder direct injection technology, etc. are widely used in engines. VVT technology can improve engine power, fuel economy and meet the requirements of new emission regulations; HLA technology can timely eliminate valve clearance and improve engine NVH (vibration and noise) performance; and in-cylinder direct injection technology is a lean gas combustion The principle is that high-pressure gasoline is directly sprayed into the cylinder in the form of mist...

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Problems solved by technology

[0003] The publication number is CN102425473A, and the name is a patent application for a double VVT ​​engine lubricating oil circuit with a hydraulic tappet oil channel. The main oil passage of the cover is provided, and there is a problem that the oil pressure of the intake side and the oil pressure of the exhaust side affect each other, that is, during the adjustment process of the intake and exhaust VVT, the adjustment of one side will inevitably lead to a decrease in the oil pressure of the oil passage (the adjustment requires oil ), resulting in a decrease in the oil supply of the VVT ​​on the other side, resulting in a slow VVT adjustment speed, resulting in a limited VVT performance; similarly, in the process of adjusting the valve clearance of the intake and exhaust HLA, the adjustment of one side will inevitably lead to oil passage in the oil passage. The pressure is reduced, so that the other side cannot timely adjust the valve clearance to zero during the process of adjusting the valve clearance, thereby reducing the NVH performance of the valve mechanism

[0004] In addition, in the existing direct-injection gasoline engines, the lubrication of the high-pressure oil pump tappets is a difficult problem. In the direct-injection gasoline engines, most of the high-pressure oil pump tappets are arranged at the tail end of the engine, and a separate external lubricating oil circuit is required, and even new Parts can meet the lubrication requirements of the tappet of the high-pressure oil pump, which makes the assembly of the whole machine more difficult, the assembly process is more complicated, and the cost is higher

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