Internal combustion engine

Claim 2

In combination with an internal combustion engine comprising a cylinder, a piston reciprocable therein, an inlet and an outlet in the cylinder, means for injecting fuel into the cylinder, a sliding sleeve in the cylinder having aperture means therein cooperating with the inlet under creation of a vacuum in the cylinder during the suction stroke of the piston and an end portion of said sleeve cooperating with said outlet for opening and closing the same, means for reciprocating said sleeve in the cylinder, an annular passage formed by the cylinder at an end thereof, a second sleeve received in said annular passage to be engaged by said end portion of the first sleeve after it closes the outlet to be pushed back thereby, an annular pneumatic cushion biasing the second sleeve to yieldingly resist the movement thereof when pushed back by said end portion of the first sleeve, and an inlet manifold having an air intake and a connection to the inlet and forming a circulation path for air drawn into the inlet manifold by the reciprocating piston.

Claim 3

In combination with an internal combustion engine comprising a cylinder, a cylinder head, a piston reciprocable therein, an inlet, an outlet, means for injecting fuel into the cylinder, means controlling the fluid flow through the inlet and the outlet under creation of a vacuum in the cylinder during the suction stroke of the piston, said means controlling the inlet and outlet comprising a first sliding sleeve in the cylinder and means for reciprocating the sleeve in the cylinder, an inlet manifold having an air intake and a connection to the inlet and forming a circulation path for air drawn into the manifold by the reciprocating piston, said first sliding sleeve forms an annular end portion controlling the flow through the outlet, said cylinder head having an annular collar thereon received within said cylinder and forming an annular space therebetween, a second sliding sleeve received within said annular space and forming therewithin an annular passage, said second sleeve being engaged by the end portion of said first sliding sleeve after closing the outlet and being pushed back thereby, means comprising an annular pneumatic cushion biasing the second sliding sleeve to yieldingly resist the movement thereof when pushed bAck by the annular end portion on the first sliding sleeve, and an annular space formed between said cylinder head and the surrounding end of the cylinder, said space being in communication with the outside atmosphere through a vent aperture in said cylinder and with said annular passage about said second sleeve, said biasing means when not pushed back by said second sleeve causing said annular passage about said second sleeve to be closed off from communication with said annular space formed between said cylinder head and the surrounding end of the cylinder.

Claim 4

In combination with an internal combustion engine comprising a cylinder, a cylinder head, a piston reciprocable therein, an inlet, an outlet, means for injecting fuel into the cylinder, means controlling the fluid flow through the inlet and the outlet under creation of a vacuum in the cylinder during the suction stroke of the piston, said means controlling the inlet and outlet comprising a first sliding sleeve in the cylinder and means for reciprocating the sleeve in the cylinder, an inlet manifold having an air intake and a connection to the inlet and forming a circulation path for air drawn into the manifold by the reciprocating piston, said first sliding sleeve forms an annular end portion controlling the flow through the outlet, said cylinder head having an annular collar thereon received within said cylinder and forming an annular space therebetween, a second sliding sleeve received within said annular space and forming therewithin an annular passage, said second sleeve being engaged by the end portion of said first sliding sleeve after closing the outlet and being pushed back thereby, means comprising an annular pneumatic cushion biasing the second sliding sleeve to yieldingly resist the movement thereof when pushed bAck by the annular end portion on the first sliding sleeve, and an annular space formed between said cylinder head and the surrounding end of the cylinder, said space being in communication with the outside atmosphere through a vent aperture in said cylinder and with said annular passage about said second sleeve, said biasing means when not pushed back by said second sleeve causing said annular passage about said second sleeve to be closed off from communication with said annular space formed between said cylinder head and the surrounding end of the cylinder.