Abstract: A multistage variable valve lift apparatus includes: a camshaft; a plurality of cams slidably provided on the camshaft and each including a cam base with a guide projection and a cam lobe; a solenoid unit that includes an operating rod with a guide slot into which the guide projection is selectively inserted; and a valve opening/closing portion that comes into selective contact any one of the plurality of cams.

Abstract: A multiple variable valve lift apparatus has a simple design that efficiently operates without interference. The apparatus according may include: a camshaft formed in a hollow cylinder shape; a control shaft disposed in the hollow of the camshaft; a cam that rotates together with the camshaft; a cam rod connecting the control shaft with the cam to move together; an operating unit disposed on the exterior circumference of the camshaft to rotate together with the camshaft; an operating unit rod connecting the control shaft with the operating unit such that the control shaft and the operating unit move together; a solenoid selectively connected with the operating unit, and moving the operating unit along an axial direction of the camshaft; and a tappet contacting the cam to transform rotational motion of the cam to rectilinear motion of a valve.

Abstract: An oil control valve includes a housing having a control port and a drain port, a first seat with a first penetration hole forming a first chamber, a second seat with a second penetration hole forming a second chamber communicated with the control port, the second seat with the housing forming a third chamber communicating with the drain port, a first check valve within the first chamber selectively closing the first penetration hole, a second check valve within the third chamber selectively closing the second penetration hole, and a third penetration hole, a control portion selectively opening the first check valve and simultaneously closing the second check valve or selectively closing the first check valve and simultaneously opening the second check valve and an orifice connecting the first chamber with the second chamber.

Abstract: A multiple variable valve lift apparatus may include a camshaft, a plurality of cams slidably fitted on the camshaft and each having a cam base with a guide groove and a cam lobe, a solenoid valve including an actuating rod capable of being selectively inserted into the guide groove of a cam in the plurality of cams, and a valve opening/closing unit capable of selectively coming in contact with any cam in the plurality of cams.

Abstract: A variable compression ratio engine may include a variable chamber housing communicated with a combustion chamber of the engine, a variable chamber piston slidably disposed within the variable chamber housing, forming a variable chamber communicated with the combustion chamber within the variable chamber housing, forming a hydraulic pressure chamber between the variable chamber piston and the variable chamber housing, and having a leaking line for flowing oil leaked from the hydraulic pressure chamber, a connecting shaft connected to the variable chamber piston, and having an oil drain line for exhausting the oil in the leaking line is formed thereto, an oil supplier supplying oil to the hydraulic pressure chamber, and a compression ratio controller connected to the connecting shaft and controlling a relative position of the variable chamber piston.

Abstract: A camshaft-in-camshaft apparatus may include a hollow outer shaft having at least one slot formed along a length direction of the hollow outer shaft, an inner shaft rotatably inserted inside the outer shaft and having at least one pin hole formed on the inner shaft, a position of each of the at least one pin hole corresponding to that of each of the at least one slot, one or more first cam lobes fixedly mounted on an exterior circumference of the outer shaft, one or more second cam lobes fixedly mounted on the inner shaft to be rotatable on the corresponding slot of the outer shaft, a cam phaser changing a phase angle between the outer shaft and the inner shaft by rotating any one of the outer shaft and the inner shaft, and at least one torsional spring mounted between any one of the one or more first cam lobes and any one of the one or more second cam lobes.

Abstract: A variable compression ratio engine includes a variable chamber housing in fluidic communication with a combustion chamber of the engine, a chamber plunger slidably disposed within the variable chamber housing and forming a variable chamber together with the variable chamber housing, a hydraulic pressure cylinder connected with the variable chamber housing, a hydraulic piston slidably disposed within the hydraulic pressure cylinder, having a slider protruded to form first and second operation chambers with the hydraulic pressure cylinder and connected with the chamber plunger, a control plunger connected with the hydraulic piston, a control cylinder for receiving the control plunger and slidable with respect to the control plunger, a compression ratio control portion selectively moving the control cylinder along the length direction, and hydraulic pressure lines supplying control hydraulic pressure to the first or second operation chamber or releasing the control hydraulic pressure from the first or second op

Abstract: A variable valve lift apparatus may include an outer body, an inner body inserted in the outer body to move up and down in the outer body, a valve cylinder inserted in the outer body on a lower side of the inner body to have one side coupled to the inner body and the other side coupled to the valve, a latching member provided either to the outer body or to the inner body to be operated by a hydraulic pressure for coupling to the outer body and the inner body selectively, a hydraulic chamber formed between the outer body and the inner body, a latching flow passage formed in the outer body to supply the hydraulic pressure to the latching member, and an oil removal valve provided to drain a fluid.

Abstract: A variable valve device for varying a lift amount of a valve includes a first valve and a second valve that are respectively disposed to open or close a port, a swing arm in which first and second valve pressing portions are formed at both sides to press the first valve and the second valve, one supporting portion that supports a part that is apart from the first and the second valve pressing portions on the swing arm, a lost body that is rotatably disposed on the swing arm through a lost pin, a camshaft on which a first cam and a second cam are formed to respectively press the lost body and the swing arm, and a latching pin that selectively fixes the swing arm with the lost body and is disposed to move in a direction that the first and the second valves are arranged.

Abstract: A CDA device includes: an outer body that moves up/down in contact with a cam and has an oil input hole at one side and latching pin chambers; an upper seat disposed inside the outer body; an inner body disposed slidably inside the outer body, has a latching pin hole, and is combined with a valve; a lost motion spring that elastically supports the outer body in a lost motion between the inner body and the outer body; latching pins that are slidably disposed in the latching pin chambers and inserted in the latching pin holes; and latching pin springs that push the latching pins into the latching pin hole, in which hydraulic pressure selectively transmitted from the oil input hole pushes the latching pins and the latching pins are separated from the latching pin holes.

Abstract: A continuous variable valve lifter having a cylinder air volume difference adjuster includes a camshaft having an input cam, an eccentric control shaft disposed parallel to the camshaft, and a control link rotatable around the eccentric control shaft. An output cam is provided to open and close a valve actuator for opening/closing, and a connection link is rotatably connected to the control link, and driving the output cam by the rotation of the input cam. A cam cap is disposed where the camshaft and the eccentric control shaft are mounted. The cylinder air volume difference adjuster includes a hinge pin serving as the rotational center of the output cam disposed parallel to the camshaft, a pin holder where the hinge pin is mounted, and an adjusting bolt for selectively shifting the position of the pin holder.

Abstract: An electro-hydraulic variable valve lift apparatus may include an hydraulic pump body installed in an engine, a piston provided to reciprocate within the hydraulic pump body and forming an hydraulic pump chamber together with the hydraulic pump body, an hydraulic pump cam disposed to be in contact with the piston and enabling the piston to reciprocate according to a rotation thereof, a retainer provided to be slidable along the piston between the piston and the engine and forming a retainer chamber with the engine, a retainer spring elastically supporting the retainer, an oil control valve allowing the hydraulic pump chamber and the retainer chamber to selectively communicate with each other, a valve opening and closing unit communicating with the hydraulic pump chamber and opened or closed according to oil pressure supplied from the hydraulic pump chamber.

Abstract: A flame jet ignition engine enables air to be effectively fed to an auxiliary combustion chamber, thereby ensuring facilitating the formation of a fuel mixture of fuel and air and therefore leading to the smooth, stable ignition of the fuel mixture in the auxiliary combustion chamber.

Abstract: A multistage variable valve lift apparatus includes: a camshaft; a plurality of cams slidably provided on the camshaft and each including a cam base with a guide projection and a cam lobe; a solenoid unit that includes an operating rod with a guide slot into which the guide projection is selectively inserted; and a valve opening/closing portion that comes into selective contact any one of the plurality of cams.

Abstract: A multiple variable valve lift apparatus has a simple design that efficiently operates without interference. The apparatus according may include: a camshaft formed in a hollow cylinder shape; a control shaft disposed in the hollow of the camshaft; a cam that rotates together with the camshaft; a cam rod connecting the control shaft with the cam to move together; an operating unit disposed on the exterior circumference of the camshaft to rotate together with the camshaft; an operating unit rod connecting the control shaft with the operating unit such that the control shaft and the operating unit move together; a solenoid selectively connected with the operating unit, and moving the operating unit along an axial direction of the camshaft; and a tappet contacting the cam to transform rotational motion of the cam to rectilinear motion of a valve.

Abstract: A multiple variable valve lift apparatus may include a camshaft, a plurality of cams slidably fitted on the camshaft and each having a cam base with a guide groove and a cam lobe, a solenoid valve including an actuating rod capable of being selectively inserted into the guide groove of a cam in the plurality of cams, and a valve opening/closing unit capable of selectively coming in contact with any cam in the plurality of cams.

Abstract: A variable cycle engine may include a first cylinder that performs an intake, a compression, an explosion, or an exhaust stroke, a second cylinder that performs an intake, a compression, an explosion, or an exhaust stroke, a connection rail that is formed near the first cylinder and the second cylinder, a first variable port that is diverged from one side of the connection rail and is connected to the first cylinder, a second variable port that is diverged from the other side of the connection rail and is connected to the second cylinder, and a first variable control valve disposed on the first variable port and a second variable control valve disposed on the second variable port, wherein the first and second variable control valves are opened or closed accordingly with respect to each other to directly connect the first cylinder with the second cylinder.

Abstract: A variable valve lift apparatus may include a camshaft, a low lift cam which may be connected to the camshaft and rotates, a high lift cam which may be rotatably mounted to the camshaft and may be selectively connected to the camshaft to rotate with the camshaft, a high lift cam connecting portion which selectively connects the high lift cam to the camshaft, and a tappet including a low lift cam contact portion contacting the low lift cam and a high lift cam contact portion selectively activating the high lift cam.

Abstract: A pre-chamber structure for a piston engine may include: a pre-chamber combustion chamber in which a mixture of fuel and air is combusted and a pre-chamber compression chamber including a sub-chamber communicating with the pre-chamber combustion chamber and having an inclined wall surface, and a main chamber extending from the sub-chamber, thereby preventing the fuel from being adsorbed and remaining in the wall surface of the pre-chamber compression chamber in a droplet state.

Abstract: A continuous variable valve lifter having a cylinder air volume difference adjuster includes a camshaft having an input cam, an eccentric control shaft disposed parallel to the camshaft, and a control link rotatable around the eccentric control shaft. An output cam is provided to open and close a valve actuator for opening/closing, and a connection link is rotatably connected to the control link, and driving the output cam by the rotation of the input cam. A cam cap is disposed where the camshaft and the eccentric control shaft are mounted. The cylinder air volume difference adjuster includes a hinge pin serving as the rotational center of the output cam disposed parallel to the camshaft, a pin holder where the hinge pin is mounted, and an adjusting bolt for selectively shifting the position of the pin holder.