Single overhead camshaft air inlet phase continuous variable mechanism of motorcycle engine

Abstract

The invention discloses a single overhead camshaft air inlet phase continuous variable mechanism of a motorcycle engine, which comprises a camshaft, an air inlet cam and an exhaust cam, wherein the camshaft is supported in a cylinder head; the air inlet cam and the exhaust cam are arranged on the camshaft; and a timing chain wheel is fixed at one end of the camshaft. The single overhead camshaft air inlet phase continuous variable mechanism of a motorcycle engine is characterized in that the camshaft is divided into two coaxial sections, one section is an air inlet cam section comprising the air inlet cam, and the other section is an exhaust cam section comprising the exhaust cam and the timing chain wheel; the two cam sections are connected by a VVT controller; the VVT controller comprises a seal cavity which contains an impeller; and a first oil cavity and a second oil cavity are arranged in the cavity and respectively connected with an engine oil control valve by a first oil passage and a second oil passage. The invention can change a phase angle of the air inlet cam, has simple structure, compact distribution and low manufacture cost and can effectively improve the dynamic property, economy and emission characteristic of the single overhead camshaft engine of the motorcycle in the whole ranges of rotating speed and load working condition.

Description

technical field [0001] The invention relates to a gas distribution mechanism of an engine, in particular to a continuously variable intake phase mechanism of a single overhead camshaft used for a motorcycle. Background technique [0002] Engine variable valve timing (VVT, Variable Valve Timing) technology is a new technology that has been gradually applied to automobile engines in recent years. New technologies developed from this technology include Honda's i-VTEC and Toyota's VVT-i. However, there are only a small number of large-displacement motorcycle engines that apply this technology on motorcycle engines, and the valve train is based on the structure of double overhead camshafts, such as Suzuki's GSF400V. [0003] Motorcycle engines mostly have a single-cylinder four-stroke structure, and the valve train mainly adopts a single overhead camshaft arrangement. Although the single overhead camshaft VVT structure is also used in automobiles, it is mainly a structural form ...

AI Technical Summary

Problems solved by technology

The switchable cam profile VVT ​​sets the high-speed cam and the low-speed cam to switch respectively corresponding to the high-speed working condition and the low-speed working condition, and cannot realize the continuous adjustment of the valve timing; The method of setting a free cam and making the free cam rotate relative to the drive wheel is used to adjust the gas distribution phase, but this type of package requires high precision in processing and installation, and the reliability is poor.

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