Abstract: A variable valve operating device that makes it possible to reduce the loss in driving force transmission from a camshaft to a valve during a valve lift is provided. The rotary motion of a drive cam is transmitted to a swing member via intermediate rollers. A coupling member couples the intermediate rollers, to a swing fulcrum that is fastened to a control shaft. The swing fulcrum is positioned eccentrically to the center of the control shaft. Further, when the control shaft is positioned at a predetermined rotation position, the swing fulcrum is positioned so that the control shaft is placed between the swing fulcrum and the intermediate rollers. Preferably, the swing fulcrum, the control shaft, and the intermediate rollers are aligned.

Abstract: The present invention relates to a variable valve operating device and makes it possible to inhibit friction during driving force transmission and provide high durability through the use of a compact configuration. A first roller 170, which comes into contact with a drive cam surface 124 of a camshaft 120, has a larger diameter than a second roller 172, which comes into contact with a slide surface 156 of a swing member 150. A coupling shaft 174 couples the first roller 170 to the second roller 172 so that the rollers 170, 172 can rotate independently. The slide surface 156 is curved toward the drive cam surface 124.

Abstract: Disclosed is a variable valve mechanism for an internal combustion engine. The variable valve mechanism accurately adjusts the valve operating angle although its structure is simple. The variable valve mechanism includes a control pin 48, which is inserted into a pin insertion hole 38 in a control shaft 16; a bearing hole 44, which is formed in a control member 26; and an adjustment pin 50, which is rotatably supported by the bearing hole 44. The adjustment pin 50 comes into surface contact with the control pin 48 to inhibit the control member 26 from rotating relative to the control shaft 16. The valve operating angle is adjusted by replacing the adjustment pin 50 with another having a different dimension B. Such adjustment pin replacement changes the distance A between the center line of the bearing hole 44 and the center line of the control pin 48, thereby changing the relative angle ? between the control shaft 16 and control member 26.

Abstract: The present invention relates to a variable valve operating device and a valve opening amount adjustment method, and can accurately control the amount of in-cylinder air and the strength of a swirl flow. The variable valve operating device according to the present invention includes a valve mechanism that can select a dual valve variable control mode in which the valve opening amounts of a first valve and a second valve, which are of the same type and provided for the same cylinder, can be varied continuously or in multiple steps. A valve opening amount difference is provided when the valve opening amounts are minimized in the dual valve variable control mode so that the valve opening amount of the first valve is larger than that of the second valve. In addition, adjustments are made so that the minimum valve opening amount of the first valve does not vary from one cylinder to another.

Abstract: A valve train for an internal combustion engine that uses motors to open/close intake valves of cylinders. The motors drive the intake valves for each of a plurality of groups of cylinders that perform an explosion stroke at substantially equal crank angle intervals. Since the intake valves are driven for each of the plurality of groups of cylinders that perform an explosion stroke at substantially equal crank angle intervals, the explosion stroke is performed regularly even when an operation is conducted with only a particular group of cylinders. This makes it possible to inhibit driveability deterioration.

Abstract: A valve drive system comprises a power transmitting mechanism (13) that converts rotary motion of an electric motor (12) into opening and closing motion of an intake valve (3) provided in a cylinder (2) of an internal combustion engine (1) to transmit power from the electric motor (12) to the valve (3) via a cam (152); and a rotational angle restricting mechanism (16) that is provided in a motion transmission path that extends from the electric motor (12) to the cam (152) and restricts rotation of the cam (152) within a predetermined angular range that is set so that a piston (5) of the engine (1) and the intake valve (3) do not interfere with each other. The rotational angle restricting mechanism (16) comprises a flange (161) that rotates as a unit with a camshaft (151) and forms a slotted groove hole (161a) thereon; and a stopper pin (162) that is inserted into and retracted from the groove hole (161a).

Abstract: The rotary motion of a camshaft is transmitted from a first drive cam to a slide surface of a swing cam arm via intermediate members so that the swing cam arm lifts a valve. In this instance, the operating characteristic of the valve changes when the rotation position of a control shaft changes to change the positions of the intermediate members on the slide surface. When the operating characteristic control mode for the valve is to be changed from variable control to fixed control, coupling means couples the swing cam arm and input arm, thereby causing a second drive cam to swing the swing cam arm. The setting for the lift amount of the valve that is obtained when the second drive cam swings the swing cam arm is not smaller than a maximum lift amount setting for a situation where the first drive cam swings the swing cam arm.

Abstract: A six-cylinder engine includes a stop-cylinder-setting section. The stop-cylinder-setting section sets to-be-stopped cylinders such that cylinders operated in a four-cylinder operation mode (two cylinders stopped) are stopped in a two-cylinder operation mode (four cylinders stopped), and the cylinders operated in the two-cylinder operation mode are stopped in the four-cylinder operation mode. The stop-cylinder-setting section stops operations of intake valves corresponding to stopped cylinders in each operation mode.

Abstract: There is provided a valve gear of an internal combustion engine converting a rotational motion of a motor into a linear motion by a cam, and driving an intake valve or an exhaust valve of a cylinder so as to be opened and closed based on the linear motion, a motor control apparatus which can actuate the motor in a rocking chive mode in which a rotating direction of the cam is changed during a lift of the valve. The motor control apparatus controls a motion of the motor such that the cam starts rotating before the valve starts lifting in the rocking drive mode.

Abstract: A valve driving device (10), that converts rotational motion outputted from a valve-driving source to linear motion through cam mechanisms (13) provided to respective cylinders (2) and drives valves (3) in respective cylinders through the linear motion, the valve driving device is equipped with electric motors (11, 12) that are shared as the valve-driving source in a group of cylinders comprising a plurality of cylinders in which open-valve periods of the valves do not overlap; and motion-transmission mechanisms (14, 15) that transmit rotational motion of the electric motors (11, 12) to cams (16) in respective cam mechanisms (13) in the group of cylinders.

Abstract: There is provided a hybrid vehicle capable of attaining excellent acceleration response and reducing pumping loss. When an engine combustion stop demand is issued, the engine is associatively rotated by carrying out a fuel cut-off operation and controlling the speed of a generator to control the engine in such a way that the speed of the engine becomes a predetermined speed NE1. During the associative rotation, intake and exhaust valves are held at their fully closed positions.

Abstract: This control device for an internal combustion engine includes a variable intake valve device and a variable exhaust valve device; and it performs fuel cut-off for a plurality of cylinders of the internal combustion engine. And it further includes: an intake valve control means which, when the fuel cut-off execution condition has come into effect, controls the variable intake valve device, so as to keep in a closed state the intake valve of a cylinder, for which an exhaust valve is not kept in a closed state; and an exhaust valve control means which, when the fuel cut-off execution condition has come into effect, controls the variable exhaust valve device, so as to keep in an open state an exhaust valve of at least a pair of cylinders, between which gases in the pair of cylinders come and go via an exhaust passage as the pistons operate.

Abstract: The invention relates to a variable valve system for an internal combustion engine including an electric motor that can be rotated in any one of a normal rotation direction and a reverse rotation direction; a first cam that is driven by the electric motor; a second cam that has a same shape as the first cam, that is driven by the electric motor, and that differs from the first cam in a rotation phase; a first valve that is opened and closed by the first cam; a second valve that is opened and closed by the second cam; and a control unit that controls rotation of the electric motor. Each of the first cam and the second cam is symmetric with respect to a straight line passing a cam center and a cam nose.

Abstract: A lost motion spring is disposed to contact at one end an oscillating member interposed between a cam and a valve for synchronizing the oscillating of the valve with the rotation of the cam. The lost motion spring impels the oscillating member toward the cam. A spring support shaft is provided for supporting a second portion of the lost motion spring. A spring position adjustment mechanism is provided for adjusting the mounting position of the lost motion spring relative to the spring support shaft.

Abstract: The present invention provides a variable valve mechanism control device that is capable of reducing the power consumption and rating of an electric motor by allowing camshaft rotary inertia torque to reduce spring reaction force during a valve lift. Camshaft rotary inertia force is increased to a value not smaller than a predetermined value before the start of a valve lift. During the time interval between the instant at which the valve lift starts and the instant at which the maximum lift is provided, the spring reaction force of a valve spring is used as deceleration torque for the camshaft rotary inertia force. During the time interval between the instant at which the maximum lift is provided and the instant at which the valve lift terminates, the spring reaction force is used as acceleration torque for the camshaft rotary inertia force. The camshaft rotary inertia force cancels the spring reaction force so that motor torque generated during a valve lift is composed of counter-friction torque only.

Abstract: There is provided a valve gear (11) with a motor (12), a cam mechanism (14) which converts a rotational motion of the motor (12) into a linear motion of an intake valve (2) by a cam (21), and a motor control apparatus (30) which controls the motor (12) such that an acceleration characteristic during a lift of the intake valve (2) changes in correspondence to a rotation number of an internal combustion engine.

Abstract: Disclosed is a valve mechanism for an internal combustion engine that uses a motor to open/close a valve body of each cylinder. The valve mechanism includes a camshaft that is rotated by the motor and equipped with cams for driving the valve body of a plurality of cylinders; control means that drives the motor while making a mode switch between a normal rotation drive mode in which the camshaft is continuously rotated in one direction to drive the valve body and a swing drive mode in which the camshaft is swung to drive the valve body; and change means that changes the relative angular positions of cylinder-specific cams on the camshaft.

Abstract: During a fuel cut, a recommended reactivated cylinder and a reactivatable cylinder are determined based on the stopped positions of an intake valve and an exhaust valve (step 104). A fastest reactivatable cylinder is then determined based on the crank angle, from among the recommended reactivated cylinder and the reactivatable cylinder (step 108). Also, the rotating direction of a motor when a variable valve drive apparatus starts to be driven again when the fastest reactivatable cylinder is made the reactivated cylinder is also determined. When a reactivation command is output, operation resumes from the fastest reactivatable cylinder when the situation calls for rapid reactivation (step 124). When the situation does not call for rapid reactivation, operation resumes from the recommended reactivated cylinder (step 118).

Abstract: An arm coupling mechanism for selectively switching a double valve variable control and single valve variable control. The single valve variable control is achieved in a condition in which a large lift arm and a second rocking cam arm are coupled together with a pin. The second rocking cam arm for moving a second valve includes a pin hole, in which the pin is inserted, formed therein. The position of the pin hole is set so that a pin switching operation can be executed when control is provided to achieve an operating angle, at which the single valve variable control is to be started for reduced NOx. A second driving cam is adapted to have a cam height greater than a cam height of a first driving cam.

Abstract: The present invention relates to a variable valve operating device and makes it possible to inhibit friction during driving force transmission and provide high durability through the use of a compact configuration. A first roller 170, which comes into contact with a drive cam surface 124 of a camshaft 120, has a larger diameter than a second roller 172, which comes into contact with a slide surface 156 of a swing member 150. A coupling shaft 174 couples the first roller 170 to the second roller 172 so that the rollers 170, 172 can rotate independently. The slide surface 156 is curved toward the drive cam surface 124.