JPS61134504U - - Google Patents

Description

[Brief explanation of the drawing]

1, 2, 3, and 4 relate to the piston valve according to the embodiment of the present invention.
The figure is an explanatory cross-sectional view of the engine during normal engine operation, Figure 2 is a cross-sectional view taken along the line A--A in Figure 1, Figure 3 is an explanatory cross-sectional view of the variable cylinder operation, and Figure 4 is a cross-sectional view of the third engine. It is a sectional view taken along the line BB in the figure. 30... Valve, 31... Valve stem, 40
...Housing, 44...Housing groove, 50...
...Plunger, 51...Spring hole, 54...
...Idle hole, 55... recess.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A valve portion that opens and closes the intake or exhaust hole of an engine combustion chamber; a stem portion that is formed integrally with the valve portion and is slidably held in the cylinder head; a connecting portion that is pressed in the axial direction of the stem portion by a pressing member such as a cam or a rocker arm, transmits movement of the pressing member in the axial direction to the stem portion, and opens and closes the valve portion; a housing having a plunger chamber movable relative to the axial direction of the stem portion at the upper end of the stem portion and biased away from each other and extending in a direction intersecting the axial direction; a plunger which is held in the plunger chamber, is biased in one direction by fluid pressure introduced into the plunger chamber, and has an idle hole into which the upper end of the stem can be inserted and removed, and a contact surface with which the upper end of the stem comes into contact; a stopper provided between the housing and the plunger to lock the plunger, which is urged by the fluid pressure, in a position where the upper end of the stem portion can be inserted into and removed from the idle hole; A biasing member provided between the plungers and biasing the plunger in a direction opposite to the biasing direction of the fluid pressure and with a force weaker than the biasing force of the fluid pressure, and applying the fluid pressure. , the plunger is locked by the stopper, the upper end of the stem part can be freely inserted into and removed from the idle hole, and the movement of the pressing member in the axial direction is absorbed by the relative movement of the connecting part with respect to the stem part. moving the plunger in the opposite direction with the biasing member by immobilizing the stem portion and the valve portion and removing the fluid pressure;
The upper end of the stem portion is brought into contact with the corresponding contact surface of the plunger, the movement of the pressing member is transmitted to the stem portion and the valve portion via the connecting portion, and the intake or exhaust hole is opened and closed by the valve portion. A piston valve for a variable cylinder internal combustion engine. (2) The piston for a variable cylinder internal combustion engine according to claim 1, wherein the housing of the connecting portion is cylindrical, and the cylindrical circumferential surface has a groove for introducing fluid in the circumferential direction. valve. (3) The plunger chamber is a bottomed hole with one end open and the other end closed, and the biasing member is a spring held in a compressed state between the bottom of the plunger chamber and one end of the plunger.Registration of a utility model. A piston valve for a variable cylinder internal combustion engine according to claim 1. (4) One end of the plunger has a central hole with a bottom, one end of the spring comes into contact with the bottom, and the peripheral edge of the one end constitutes a stopper. Piston valve for engine. (5) The piston valve for a variable cylinder internal combustion engine according to claim 3, wherein one end of the plunger has a central projection, and the central projection constitutes a stopper.