Variable valve mechanism for motorcycle engine with double overhead camshafts

Abstract

The invention provides a variable valve mechanism for a motorcycle engine with double overhead camshafts. The variable valve mechanism comprises a cylinder head, an exhaust camshaft, an exhaust rocker arm, an intake camshaft, a low-speed intake cam, a high-speed intake cam, an intake rocker arm and an electromagnet, wherein the exhaust camshaft and the intake camshaft are arranged in the cylinder head in parallel, the high-speed intake cam is arranged between the low-speed intake cam and a cam shaft front gland, a friction spring is arranged between the high-speed intake cam and the cam shaft front gland, an axial key groove C is formed in the tail end of the intake camshaft, a movable middle push rod is arranged in the key groove C, and the head end of the middle push rod abuts against a synchronous plug pin. The variable valve mechanism is suitable for a motorcycle engine with the double overhead camshafts, the valve timing can be changed when the engine is in the high-speed working condition and the low-speed working condition so that the engine can achieve the optimal performance, the structure control precision is high, the space arrangement is compact, and the sound generated when the synchronous bolt works is effectively eliminated.

Description

Technical field [0001] The present invention relates to a motorcycle engine technology, in particular variable valve mechanism of the engine, particularly for a motorcycle engine having a variable DOHC valve train. Background technique [0002] High engine speeds, low-speed two different working conditions, require high-speed intake cam by synchronizing latch control and low-speed intake cam is synchronized with the separation, in order to change the valve timing (valve lift, valve overlap angle), so that the engine in different the optimal operation condition, the valve mechanism referred to VVS (Variable Valve Timing and Valve Lift SmartSystem). [0003] Motorcycle cylinder engine variable valve timing structure, the use of a single camshaft (single high-speed intake cam shaft is disposed, the low-speed intake cam, the exhaust cam), and fitted with double intake rocker arm assembly pin (hole - holes - the shaft) synchronous, low speed when the engine operating condition (engine...

AI Technical Summary

Problems solved by technology

[0004] At present, the motorcycle industry is more and more inclined to large displacement and refined control, so double overhead camshafts (the intake cam and exhaust cam are not arranged on the same axis) have become the mainstream. At this time, simply copy the original application The double-intake rocker arm variable valve timing structure of a single camshaft will lead to larger space and lower precision of the cam control rocker arm. Therefore, the double intake rocker arm variable valve phase structure originally applied to a single camshaft Not suitable for double overhead or multiple overhead camshaft models, it is necessary to design a new variable valve train

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