Electric-control hydraulic adjustment mechanism based on camshaft and allowing valve lift to be changed continuously

Abstract

The invention provides an electric-control hydraulic adjustment mechanism based on a camshaft and allowing the valve lift to be changed continuously. The electric-control hydraulic adjustment mechanism based on the camshaft and allowing the valve lift to be changed continuously structurally comprises a cam, a tappet body, an oil inlet hole, an engine body main oil duct, an adjustment oil cavity, a sliding sleeve, an oil hole, a plunger, a connecting body, an oil drainage channel, a one-way valve, a plunger bushing, a valve, an oil return hole, an oil return groove, an electromagnetic valve, a return spring, a guide rod, a control piston and an oil return duct, wherein the tappet body moves along the outer edge of the sliding sleeve along with the cam, oil pressure in the adjustment oil cavity acts on the top surface of the sliding sleeve, the sliding sleeve moves up and down along the inner edge of the connecting body and the outer edge of the plunger bushing, the sliding sleeve and the plunger bushing are matched with the plunger located inside the plunger bushing, so that an auxiliary oil cavity and a high pressure oil cavity are defined, and the bottom of the plunger bushing is connected with the head of the valve. The electric-control hydraulic adjustment mechanism based on the camshaft and allowing the valve lift to be changed continuously has the advantages that the valve lift is adjusted by controlling oil intake and oil return and adjusting the change of the quantity of oil in the oil cavity, continuous change of the valve lift is achieved, the number of components is small, the occupied space is small, an engine cylinder cover is slightly changed, and the defects of an existing adjustment mechanism are effectively overcome.

Description

technical field [0001] The invention relates to the field of an engine valve mechanism, in particular to an electronically controlled hydraulic adjustment mechanism based on a camshaft whose valve lift is continuously variable. Background technique [0002] The engine realizes the ventilation process through the valve mechanism, and its speed changes in a relatively large range during the working process: when the engine is running at low speed, the airflow speed is slow, the flow inertia is small, and the valve lift is too large to cause the fresh air in the cylinder to flow back; when the engine is running at high speed , the airflow speed is faster, the flow inertia is larger, and the valve lift that is too small will increase the flow resistance, which is also not conducive to the perfection of the intake process. In order to overcome the shortcomings of the fixed valve lift of the traditional engine valve train and the shortcomings of the existing variable valve lift de...

AI Technical Summary

Problems solved by technology

[0002] The engine realizes the ventilation process through the valve mechanism, and its speed changes in a relatively large range during the working process: when the engine is running at low speed, the airflow speed is slow, the flow inertia is small, and the valve lift is too large to cause the fresh air in the cylinder to flow back; when the engine is running at high speed , the airflow speed is faster, the flow inertia is larger, and the valve lift that is too small will increase the flow resistance, which is also not conducive to the perfection of the intake process

In order to overcome the shortcomings of the fixed valve lift of the traditional engine valve train and the shortcomings of the existing variable valve lift device, an electro-hydraulic adjustment mechanism based on the camshaft with continuously variable valve lift is proposed here

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