Abstract: In an engine valve, a first sliding area formed at a valve head side in an outer face of a valve stem, and sliding along a stem guide, a second sliding area formed at an opposite side from the valve head side, and sliding along the stem guide, and a first small diameter area formed between the first sliding area and the second sliding area are formed. Further, in the engine valve, a length, in an axial direction of the valve stem, of the first sliding area abutting on the stem guide at a position where the engine valve is fully opened is longer as compared with a length, in the axial direction of the valve stem, of the second sliding area abutting on the stem guide at a position where the engine valve is fully closed.

Abstract: A valve rotation includes: a first sheet member that extends toward a surrounding of a valve stem under a condition that a rotation action of the first sheet member is suppressed with respect to a cylinder head, and a second sheet member that faces to the first sheet member, that is capable of rotating with respect to the first sheet member and is subjected to a load for opening the valve; a force conversion structure that converts the load for opening the valve applied to the second sheet member into a rotation force.

Abstract: An engine valve for an internal-combustion engine includes: a head part including a main surface facing a combustion chamber of the internal-combustion engine and a valve face coming in contact with a valve seat; a stem part extending along a direction of movement of the engine valve; and a neck part between the head part and the stem part. A material of the stem part is heat-resistant steel. A material of the head part is a high-? material such as aluminum, an aluminum alloy, tungsten steel, chrome steel, low-chrome steel, and low-carbon steel.

Abstract: A poppet valve includes a head and a stem, which extends from the head. At least a part of the back of the head is covered by a cover with a heat insulating space provided in between. A support portion is provided between the cover and the head to support the cover on the head with rubber member having a lower heat conductivity than that of the head between the cover and the head.

Abstract: In an engine valve, a first sliding area formed at a valve head side in an outer face of a valve stem, and sliding along a stem guide, a second sliding area formed at an opposite side from the valve head side, and sliding along the stem guide, and a first small diameter area formed between the first sliding area and the second sliding area are formed. Further, in the engine valve, a length, in an axial direction of the valve stem, of the first sliding area abutting on the stem guide at a position where the engine valve is fully opened is longer as compared with a length, in the axial direction of the valve stem, of the second sliding area abutting on the stem guide at a position where the engine valve is fully closed.

Abstract: A valve rotation includes: a first sheet member that extends toward a surrounding of a valve stem under a condition that a rotation action of the first sheet member is suppressed with respect to a cylinder head, and a second sheet member that faces to the first sheet member, that is capable of rotating with respect to the first sheet member and is subjected to a load for opening the valve; a force conversion structure that converts the load for opening the valve applied to the second sheet member into a rotation force.

Abstract: A sealed type lash adjuster (100A) includes a plunger (2A), a body (1) in which the plunger (2A) is inserted in a fitting manner, a first sealing means (5) provided between the plunger (2A) and the body (1), and a second sealing member (20A) that can prevent or suppress intrusion of an engine oil from an outside. The second sealing means (20A) seals a portion of the plunger (2A) exposed from the body and is arranged so as to cover a clearance (K) formed between an open end portion of the body and the plunger (2A). More specifically, the second sealing member (20A) has a one-end portion (20aA) and an other-end portion (20bA) as sealing parts having a function of preventing or suppressing intrusion of the engine oil from the outside.

Abstract: A poppet valve includes a head and a stem, which extends from the head. At least a part of the back of the head is covered by a cover with a heat insulating space provided in between. A support portion is provided between the cover and the head to support the cover on the head with rubber member having a lower heat conductivity than that of the head between the cover and the head.

Abstract: It is possible to suppress fluctuations of an air intake amount when the open degree of an air intake control valve is unknown. An engine includes an impulse valve common to all the cylinders arranged in the engine. The impulse valve is arranged in a communicating tube provided at the downstream side of a serge tank. An ECU executes impulse valve drive control. In the control, the ECU judges whether a rotation angle sensor which detects the open degree of the impulse valve has failed. If it is judged that the rotation angle sensor has failed, the ECU controls a drive motor and a drive circuit for driving a valve body so that a valve body of the impulse valve rotates inside the communicating tube. Here, the rotor of the drive motor which defines the rotation speed of the valve body has an rpm which is set in accordance with the mechanical rpm NE of the engine.

Abstract: A sealed lash adjuster (100A) has a plunger (2), and a body (1A) accommodating the plunger. In addition, the sealed lash adjuster (100A) has a first seal member (5) on a sliding portion of the plunger (2), and has a second seal member (30) on a sliding portion of the body (1A) that faces the sliding portion. Specifically, the lash adjuster (100A) has the first seal member (5) on the sliding portion of the plunger (2) and the second seal member (30) on the opposing sliding portion of the body (1A), such that a space K formed between the first seal member (5) and the second seal member (30) expands when the plunger (2) is pressed inward, and the space K contacts when the plunger (2) protrudes outward.

Abstract: A sealed type lash adjuster (100A) includes a plunger (2A), a body (1) in which the plunger (2A) is inserted in a fitting manner, a first sealing means (5) provided between the plunger (2A) and the body (1), and a second sealing member (20A) that can prevent or suppress intrusion of an engine oil from an outside. The second sealing means (20A) seals a portion of the plunger (2A) exposed from the body and is arranged so as to cover a clearance (K) formed between an open end portion of the body and the plunger (2A). More specifically, the second sealing member (20A) has a one-end portion (20aA) and an other-end portion (20bA) as sealing parts having a function of preventing or suppressing intrusion of the engine oil from the outside.

Abstract: An intake passage in an internal combustion engine includes an independent passage disposed in each of cylinders, and a common passage connected to the independent passage, to be commonly used by the different cylinders. A cross-sectional area of the independent passage disposed in the cylinder having the long passage length from an intake valve to a surge tank is made greater than that of the independent passage disposed in the cylinder having the short passage length.

Abstract: A lash adjuster 100A includes a plunger 2, a body 1 in which the plunger 2 is inserted in a fitting manner, a first sealing member 5 provided between the plunger 2 and the body 1, and a second sealing member 20A that slidably seals a portion of the plunger 2 exposed out of the body 1, and that is arranged in a manner covering a clearance K provided between an open end portion of the body 1 and the plunger 2 in a state of being directly or indirectly fixed in close contact to the body 1, and a portion of the body 1 located on the side nearer to the open end portion thereof than the first sealing member 5 is provided with a communication hole 1a that communicates an inner wall surface of the body 1 with an outer wall surface thereof.

Abstract: A sealed lash adjuster (100A) has a plunger (2), and a body (1A) accommodating the plunger. In addition, the sealed lash adjuster (100A) has a first seal member (5) on a sliding portion of the plunger (2), and has a second seal member (30) on a sliding portion of the body (1A) that faces the sliding portion. Specifically, the lash adjuster (100A) has the first seal member (5) on the sliding portion of the plunger (2) and the second seal member (30) on the opposing sliding portion of the body (1A), such that a space K formed between the first seal member (5) and the second seal member (30) expands when the plunger (2) is pressed inward, and the space K contacts when the plunger (2) protrudes outward.

Abstract: It is possible to suppress fluctuations of an air intake amount when the open degree of an air intake control valve is unknown. An engine includes an impulse valve common to all the cylinders arranged in the engine. The impulse valve is arranged in a communicating tube provided at the downstream side of a serge tank. An ECU executes impulse valve drive control. In the control, the ECU judges whether a rotation angle sensor which detects the open degree of the impulse valve has failed. If it is judged that the rotation angle sensor has failed, the ECU controls a drive motor and a drive circuit for driving a valve body so that a valve body of the impulse valve rotates inside the communicating tube. Here, the rotor of the drive motor which defines the rotation speed of the valve body has an rpm which is set in accordance with the mechanical rpm NE of the engine.

Abstract: The liquid is sealed in the lash adjuster so that the volume “V1” of the gas, in the reservoir chamber when the lash adjuster is being produced and the plunger protrudes from the body, is equal to or more than 1.24 times as great as the sum of the volume “Vo1” of the liquid discharged from the high-pressure chamber when the plunger moves downward, and the increase “Vo2” in the volume of the liquid that expands, due to heat, when the temperature of the gas in the reservoir chamber is increased from the production temperature to the maximum use temperature, and the ratio of “V1” to “Vo1+Vo2” is equal to or higher than a ratio, which is derived based on the production temperature and the maximum use temperature, when the inner pressure of the lash adjuster increases by 500 kPa at maximum.

Abstract: The liquid is sealed in the lash adjuster so that the volume “V1” of the gas, in the reservoir chamber when the lash adjuster is being produced and the plunger protrudes from the body, is equal to or more than 1.24 times as great as the sum of the volume “Vo1” of the liquid discharged from the high-pressure chamber when the plunger moves downward, and the increase “Vo2” in the volume of the liquid that expands, due to heat, when the temperature of the gas in the reservoir chamber is increased from the production temperature to the maximum use temperature, and the ratio of “V1” to “Vo1+Vo2” is equal to or higher than a ratio, which is derived based on the production temperature and the maximum use temperature, when the inner pressure of the lash adjuster increases by 500 kPa at maximum.

Abstract: In an internal combustion engine having an electromagnetically driven valve for driving one of an intake valve and an exhasut valve, at least a lubricating oil passage to a head section including a lubricating oil passage to the electromagnetically driven valve is provided independently from other lubricating oil passage such that the lubricating oil for the electromagnetically driven valve is not mixed with the other lubricating oil. A lubricating device is allowed to have a portion where the lubricating oil is commonly used so long as the lubricating oil for the electromagnetically driven valve and the lubricating oil for the other elements are not mixed.

Abstract: A device for controlling an internal combustion engine with a variable valve timing system is provided. While the piston descends just after the combustion in the cylinder, the intake valve is opened by the variable valve system for the intake valve such that the intake air is supplied into the cylinder from the engine intake system.

Abstract: An engine is operated in accordance with a plurality of operation modes obtained by combining one of a 4-cycle mode and a 2-cycle mode with one of a combustion ignition control where an ignition is performed with an ignition unit and a self ignition priority control including the ignition performed without the ignition unit. Upon switching of the operation mode, a transition cycle is performed once between a first operation mode before switching of the operation mode and a second operation mode after switching of the operation mode. Timing for operating an intake valve or an exhaust valve in the transition cycle is different from that in the second operation mode. The combustion ignition control is executed in one of the combustion chambers where the single operation of the transition cycle is completed until a single cycle of each transient cycle in the rest of the combustion chambers is terminated.