Cam shaft with matched central OCV

Abstract

The invention discloses a cam shaft with a matched central OCV. The cam shaft comprises the central OCV which is connected with a first shaft neck at the front end of the cam shaft; a first oil path communicating with a first bearing cover is arranged in the first shaft neck; the two ends of the first oil path are separately connected with the central OCV and a main oil path in the cam shaft; and the cam shaft further comprises a limiting mechanism which is arranged in the first shaft neck for limiting and guiding oil in the first oil path into the main oil path. The cam shaft can effectively avoid the problem that oil supply to a VVT by the central OCV is affected due to the fact that a leakage rate of lubricating oil of the shaft neck is too great in an operation process of an engine, so that influences on performances of the engine are avoided.

Description

technical field [0001] The invention belongs to the technical field of engines, and in particular relates to a camshaft matching a central OCV. Background technique [0002] The engine VVT ​​system is one of the key systems to improve engine performance and fuel economy. The current VVT system is mainly divided into the VVT ​​system of ordinary side-mounted OCV, the VVT ​​system of mid-mounted OCV and the electric VVT system; the current VVT system of side-mounted OCV There have been a large number of applications, and the mid-mounted OCV is also the application trend of the current VVT system. The reason is that the mid-mounted OCV improves the engine oil circuit layout structure, optimizes the axial size and overall layout of the engine; the above two types are hydraulic actuators; Currently, the VVT ​​system cannot be widely used due to its relatively high price. [0003] A brief description of the oil circuit design structure of the VVT ​​system with side-mounted OCV: t...

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Problems solved by technology

[0002] The engine VVT ​​system is one of the key systems to improve engine performance and fuel economy. The current VVT system is mainly divided into the VVT ​​system of ordinary side-mounted OCV, the VVT ​​system of mid-mounted OCV and the electric VVT system; the current VVT system of side-mounted OCV There have been a large number of applications, and the mid-mounted OCV is also the application trend of the current VVT system. The reason is that the mid-mounted OCV improves the engine oil circuit layout structure, optimizes the axial size and overall layout of the engine; the above two types are hydraulic actuators; VVT system, currently due to its relatively high price, it cannot be widely used at the same time

[0003] A brief description of the oil circuit design structure of the VVT ​​system with side-mounted OCV: the oil from the main oil circuit of the cylinder head enters the first bearing cover, and is respectively connected with the A and B oil grooves and oil holes on the first journal of the camshaft, and the oil circuit enters the phaser Cavities A and B to adjust the phaser; another branch C from the oil circuit of the first bearing cover enters the hollow part of the camshaft to meet the lubrication of each journal, and the oil circuits A, B and C do not communicate with each other; but for the use of For the VVT ​​system with a mid-mounted OCV, the OCV is installed at the front end of the camshaft at this time, and the first bearing cover needs to supply oil to the first journal of the camshaft, but for the hollow camshaft journal, due to the mid-mounted OCV Arrangement, if oil is still supplied to the mid-mounted OCV and the hollow part of the camshaft by the first journal at the same time and no corresponding measures are taken, the excessive leakage of lubricating oil to the journal will affect the mid-mounted OCV during engine operation. VVT supplies oil, which affects engine performance

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