Hydraulic valve driving system
A valve and hydraulic technology, applied in the direction of engine components, machines/engines, non-mechanically actuated valves, etc., can solve problems such as lagging valve response speed, valve fatigue, and insufficient response speed, so as to achieve fast response speed and eliminate shock Effect
Inactive Publication Date: 2012-04-25
李文元
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Problems solved by technology
[0002] The existing overhead camshaft valve drive system, due to its own structural limitations, cannot change the valves individually, nor can the valves provide the best valve phase and lift for all engine operating conditions. Currently, the known valve drive methods, such as The electromagnetic drive system has a large valve seating impact, the response speed is not fast enough, and the energy consumption is large, and the valve seating impact will cause valve fatigue and strong noise
[0003] The working principle of the electromagnetic hydraulic valve drive system is to realize the opening and closing of the valve through the opening and closing of the solenoid valve. The congenital defect of this working principle is that every time the valve is opened and closed, the ECU needs to control the solenoid valve first After opening or closing, high-pressure oil enters the hydraulic chamber of the piston to drive the opening and closing of the valve. From the opening or closing of the solenoid valve to the oil pressure in the hydraulic chamber of the piston reaching the standard pressure, it takes a certain amount of time, which causes the valve to open or close. Congenital defects of lagging response speed, the above problems cause the engine to fail to work at high speeds
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[0019] Figure 1 and Figure 4 Shown is a built-in camshaft (4), which is connected by gears and crankshaft timing gears (not shown in the figure). The rotational speed of the camshaft (4) is half of that of the crankshaft (1). 1) Connect, and the lubricating oil pump (3) is first connected to the multi-function valve (31) and then connected to the valve control hydraulic piston (10) and the plunger pump (27). The multi-function valve (31) uses high-pressure oil to transmit During the process, due to their different specific gravity, the liquid and the gas form a natural phenomenon that the liquid is at the bottom and the gas is at the top. The air bubbles are filtered clean, eliminating the adverse effects on the normal operation of the valve drive system due to air resistance obstacles.
[0020] The elastic force of the pre-tightening spring (not shown in the figure) on the pressure limiting port (35) and the air release port (34) should make the oil pressure stable in a sui...
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The invention discloses a hydraulic valve driving system, which is characterized in that one camshaft is built in a crankcase, wherein each cam on the camshaft drives one hydraulic piston; the hydraulic piston is connected with a valve-control hydraulic piston via an oil pipe; the valve-control hydraulic piston is provided with a bidirectional solenoid valve and a piston position sensor; and the valve-control hydraulic piston is composed of a main piston and an auxiliary piston, wherein the auxiliary piston is fixedly connected with a valve stem. Because the hydraulic piston, the valve-control hydraulic piston and the connecting oil pipe of the valve-control hydraulic piston are in the closed state, oil pressure is constant, the valve-control hydraulic piston is driven by the cam to realize the purpose of accurately and singly controlling the valve, and the valve sitting impact is eliminated.
Description
technical field [0001] The invention relates to an engine hydraulic valve drive system, which can control the timing and lift of a single valve in a single cylinder, and can close any required cylinder according to the load state of the engine, and can realize the overall control of the valve. Background technique [0002] The existing overhead camshaft valve drive system, due to its own structural limitations, cannot change the valves individually, nor can the valves provide the best valve phase and lift for all engine operating conditions. Currently, the known valve drive methods, such as The electromagnetic drive system suffers from large valve seating impact, insufficient response speed, and large energy consumption, and the large valve seating impact causes valve fatigue and strong noise. [0003] The working principle of the electromagnetic hydraulic valve drive system is to realize the opening and closing of the valve through the opening and closing of the solenoid va...
Claims
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IPC IPC(8): F01L9/02F01L9/11
Inventor 李文元
Owner 李文元