초록 ▼

An intake/exhaust valve assembly of an internal combustion engine, comprising a reciprocating valve movable into and out of the combustion chamber, a cam driven for rotation by the crankshaft, a cam follower intervening between the cam and the reciprocating valve, a control plunger slidable between

An intake/exhaust valve assembly of an internal combustion engine, comprising a reciprocating valve movable into and out of the combustion chamber, a cam driven for rotation by the crankshaft, a cam follower intervening between the cam and the reciprocating valve, a control plunger slidable between first and second axial positions in a main axial bore and defining a pressure-acting chamber in the main axial bore, the control plunger being formed with a passageway open at one end to the pressure-acting chamber and at the other end through the peripheral wall of the plunger, the plunger being operative and inoperative to bear the force transmitted from the cam through the cam follower when the control plunger is in the first and second axial positions, respectively, a check valve providing one-way communication from the passageway in the plunger to the pressure-acting chamber, a fluid discharge chamber open to the pressure-acting chamber, a fluid outlet passageway communicable with the fluid discharge chamber, a pressure-release valve having a condition providing communication between the fluid discharge chamber and the fluid outlet passageway and a condition blocking the communication, a valve actuator to actuate the pressure-release valve under predetermined conditions of the engine, and fluid supply means communicable with the passageway in the control plunger.

대표청구항 ▼

An intake/exhaust valve assembly of an internal combustion engine including an engine block having a combustion chamber formed therein, comprising: (1) a reciprocating valve axially movable back and forth into and out of the combustion chamber; (2) a cam rotatable about an axis fixed with respect to

An intake/exhaust valve assembly of an internal combustion engine including an engine block having a combustion chamber formed therein, comprising: (1) a reciprocating valve axially movable back and forth into and out of the combustion chamber; (2) a cam rotatable about an axis fixed with respect to the engine block at a speed variable with the speed of rotation of the crankshaft of the engine; (3) a cam follower engaging at one end with the reciprocating valve, said cam being held in rollable engagement with the cam follower; (4) adjusting means comprising a cylinder wall which is stationary with respect to said engine block and which is formed with a main axial bore open at one end thereof and closed at the other end thereof, and an auxiliary axial bore being at one end thereof open to and integral with said main axial bore adjacent the closed end of the main axial bore, said cylinder wall being further formed with a fluid drain passageway communicable with said auxiliary axial bore, a control plunger axially slidable between predetermined first and second axial positions in said main axial bore and having an end wall defining a pressure-acting chamber in the main axial bore, the control plunger being formed with a passageway which is open at one end thereof to said pressure-acting chamber and at the other end thereof through a peripheral wall portion of the plunger, said cam follower pivotally engaging said control plunger, said control plunger being operative and inoperative to bear the force transmitted thereto from said cam through said cam follower when the control plunger is in said first and second axial positions, respectively, thereof, and one-way check valve means providing one-way communication from said passageway to said pressure-acting chamber; (5) pressure-release valve means positioned in said auxiliary axial bore so as to form a fluid discharge chamber open to and integral with said pressure-acting chamber and having a first condition providing communication between the fluid discharge chamber and the fluid drain passageway and a second condition blocking the communication therebetween; (6) valve actuating means operative to actuate the pressure-release valve means under predetermined operational conditions of the engine; and (7) fluid supply means communicable with the passageway in said control plunger.