JPS6226510U - - Google Patents

Description

[Brief explanation of drawings]

Fig. 1 is a configuration diagram showing one embodiment of the present invention;
3 is a sectional view showing a conventional example of a valve drive device for an internal combustion engine, and FIG. 4 is an exploded view of the main part of FIG. 3. DESCRIPTION OF SYMBOLS 12... Phase conversion device, 17... Cam, 19... Pressure chamber, 20... Plunger, 20a... Notch, 22...
Relief passage, 23...sleeve, 24...control rack, 25...intake/exhaust valve, 26...hydraulic cylinder.

Claims (1)

[Scope of utility model registration request] A cam driven by the output shaft of the engine, a pumping means for pumping incompressible fluid in a pressurizing chamber by a plunger driven by the cam, and an intake valve that is controlled by the pumped incompressible fluid according to the effective stroke of the plunger. Alternatively, a fluid pressure cylinder that drives an exhaust valve, a relief passage that opens at a predetermined position of the pressurizing chamber of the pressure feeding means, and an opening/closing means that opens and closes the relief passage depending on the axial position of the plunger; plunger effective stroke changing means for changing the relative rotational position of the plunger and the relief passage to change the timing of communication between the relief passage and the pressurizing chamber corresponding to the axial position of the plunger; and a crank angle of the output shaft of the engine. A valve driving device for an internal combustion engine, comprising: valve opening/closing valve timing changing means for changing the angular phase of the cam relative to the valve opening/closing valve timing.