Combined Camshaft with Variable Wrap Angle, Engine and Automobile

Abstract

The invention relates to a combined camshaft with variable wrap angle, an engine and an automobile. The combined camshaft with variable wrap angle includes a camshaft structure, a combined cam structure and a cam rotation driving structure. The camshaft structure includes a cam inner shaft , and a cam sleeve movably set outside the cam inner shaft; the combined cam structure includes a plurality of fixed cams set on the cam sleeve, and a rotating cam structure movably set outside the cam sleeve, the rotating cam structure and the cam The inner shafts are connected, and the rotating cam structure is located between two adjacent fixed cams; the cam rotating driving structure includes a driving housing arranged at one end of the cam sleeve, and a hydraulic rotating driving body arranged in the driving housing, The main body of the hydraulic rotating drive is connected with the inner shaft of the cam, and is used to drive the inner shaft of the cam to rotate relative to the cam sleeve to drive the rotation of the rotating cam structure; therefore, the duration of valve opening can be automatically adjusted, which can fully meet the actual requirements of the engine. Gas distribution requirements.

Description

technical field [0001] The invention relates to the technical field of automobile engines, in particular to a combined camshaft with variable wrap angle, an engine and an automobile. Background technique [0002] At present, the camshafts of gasoline engines are all designed with a fixed wrap angle, which means a fixed valve opening duration and a fixed valve overlap angle; with the further stringent requirements on fuel consumption and emission of traditional gasoline engines, Atkinson-Miller cycle and other technical trends are gradually developing; this type of engine is an Atkinson cycle at low-to-medium speed and low-to-medium load, and the longer duration of intake valve opening can delay the closing time of the intake valve, changing the Its expansion ratio; at high load, it is necessary to realize the Otto cycle to ensure power performance, and at this time, the closing time of the intake valve is required to be advanced. [0003] However, in the related art, the ex...

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Problems solved by technology

[0003] However, in the related art, the existing camshaft is a single cam, and the valve opening duration cannot be automatically adjusted, which cannot meet the requirements of the above two cycles at the same time, and cannot fully meet the actual gas distribution requirements of the engine.

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