A variable valve tappet

Abstract

A variable valve tappet, comprising a tappet base (9) and a holder (12). The tappet base (9) is of a cylinder structure having a T-shaped hollow cylindrical groove provided on an upper portion thereof, and a tappet sleeve (14) being of a hollow cylinder structure is fit over the tappet base (9). The tappet further comprises a valve push rod base (16) being of a cylinder structure. An additional lift cavity (20) is formed between the lower surface of the valve push rod base (16) and the tappet base (9). The holder (12) is of a hollow cylindrical structure. The upper surface of the valve push rod base (16) extends outwards along the outer edge of the cylinder to match the inner surface of the holder (12), so that an oil storage cavity (17) is formed between the upper surface of the valve push rod base (16) and the inner surface of the holder (12). An oil pumping cavity (11) is formed among the outer surface of the holder (12), the inner surface of the tappet sleeve (14), and the tappet base (9). A tappet spring (19) is provided in the oil pumping cavity (11) outside the valve push rod base (16). The tappet sleeve (14) is provided with an oil inlet (8) connected to an oil supply system, and an oil return port (22) connected to an oil return system. The upper surface of the valve push rod base (16) is connected to a valve push rod (15). A cam (1) is provided directly below the tappet base (9). The variable valve tappet can achieve valve timing and lift control in operating situations where an engine have different speeds, and features low costs, high applicability, and high stability.

Description

technical field [0001] The invention relates to the technical field of an engine valve mechanism, in particular to a variable valve tappet. Background technique [0002] The traditional valve mechanism of the engine mostly uses the camshaft to drive the intake and exhaust valves, and the timing and control of the valve phase are realized through the mechanical transmission between the crankshaft and the camshaft, and between the camshaft and each valve; and the design of the cam line is It is selected according to the comprehensive evaluation value of various indicators under the engine speed under each working condition, which can only meet the performance requirements of the engine under a certain working condition, and cannot bring the performance of the engine to the best state under each working condition; it is different from the traditional engine Compared with advanced gas distribution technology, variable valve technology can provide the best valve timing or lift un...

AI Technical Summary

Problems solved by technology

[0002] The traditional valve mechanism of the engine mostly uses the camshaft to drive the intake and exhaust valves, and the timing and control of the valve phase are realized through the mechanical transmission between the crankshaft and the camshaft, and between the camshaft and each valve; and the design of the cam line is It is selected according to the comprehensive evaluation value of various indicators under the engine speed under each working condition, which can only meet the performance requirements of the engine under a certain working condition, and cannot bring the performance of the engine to the best state under each working condition; it is different from the traditional engine Compared with advanced gas distribution technology, variable valve technology can provide the best valve timing or lift under various engine speed conditions to meet the requirements of engine power, economy and emission; in the face of energy saving, emission reduction and environmental pollution Two major problems, variable valve technology has become one of the key technologies for internal combustion engine researchers in various countries to achieve efficient and clean combustion technology routes; most of the existing variable valve mechanisms can only achieve partial functions such as early opening or late closing of the valve, and cannot Continuous regulation under full engine operating conditions, thereby limiting the best performance of the engine

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