16results about "Valve camshafts" patented technology

To provide a variable valve gear for capable of making components common while suppressing increase in a size of an engine.SOLUTION: In a cylinder head (23), a cam chain (31) is installed at a center in a predetermined direction where a plurality of cylinders (29) is arranged side by side, and a spark plug (19) is installed at both side walls recessed in a predetermined direction. In a variable valve gear (40) for the cylinder head, there are provided in each cylinder a rocker shaft (46) extending in a predetermined direction, a plurality of rocker arms (51a, 51b) supported by the rocker shaft, a connection pin (61) installed in a pin hole of one rocker arm, a return pin (62) installed in a pin hole of the other rocker arm, a thrust member (63) for forcing the connection pin to push the return pin into the other side, and a repulsion member (64) for forcing the return pin to push the connection pin back to one side. The connection pin, the return pin, the thrust member, and the repulsion member are each away from the spark plug in the direction perpendicular to the predetermined direction in plan view.SELECTED DRAWING: Figure 4

Control device (50) of a valve opening / closing timing control mechanism (VT) configured to have a drive-side rotating body (21) configured to rotate synchronously with the rotation of a crankshaft (1) of an internal combustion engine (E); an output-side rotating body (22) configured to rotate integrally with a camshaft (7) to open or close a valve (Va, Vb) that opens or closes a combustion chamber; a stopper unit (R) configured to determine a mechanical operating limit on one side with the furthest lagging angle and a mechanical operating limit on one side with the furthest leading angle of the driven-side rotating body with respect to the driven-side rotating body; and an electric motor (M) configured to control a relative rotational phase between the drive-side rotating body and the driven-side rotating body, the control device with: a phase controller (52) configured to control the electric motor to reduce, when a target phase (Tp) is set, any deviation between the target phase and a current first actual phase (Tx) detected by a phase sensing unit which detects the relative rotational phase, and to reduce the power supplied to the electric motor as the deviation decreases; and a control target setting unit (53) configured to set, instead of the target phase, a first target phase (T1) which is shifted from the target phase to one side of the first actual phase by a specified angle in an operating direction in which the deviation is reduced when the target phase is set to a phase with the furthest lagging angle or a phase with the furthest leading angle, which are an operating limit of the stopper unit, wherein the phase controller performs a first phase control, which is a phase control to reduce a deviation between the specified first target phase and the current first actual phase, wherein, if it is determined that the relative rotation phase reaches the first target phase by executing the first phase control, the control target setting unit sets the target phase to a second target phase (T2) instead of the first target phase, and the phase controller executes a second phase control, which is a phase control to reduce a deviation between the specified second target phase and an actual second phase, and wherein, After it is determined that the relative rotation phase reaches the second target phase by executing the second phase control, the control target setting unit sets a third target phase (T3) instead of the second target phase, which is shifted from the target phase to a side opposite the first actual phase by a predetermined angle in the operating direction where the deviation is reduced, and the phase controller executes a third phase control, which is a phase control to reduce a deviation between the set third target phase and an actual third phase.

A new type of gas exchange valve control system for internal combustion engines and an internal combustion engine having such a system are provided. [Solution] A gas exchange valve control system (10) for an internal combustion engine, particularly a large internal combustion engine, comprising at least one camshaft (11) supporting an intake cam (12) for controlling intake valves and an exhaust cam (13) for controlling exhaust valves for a cylinder row arranged adjacent to each other, wherein in the first modification the intake cam (12) and in the second modification the exhaust cam (13) are non-rotatably mounted on each camshaft (11) and can be driven by each camshaft (11), and in the first modification the exhaust cam (13) and in the second modification the intake cam (12) are rotatably mounted on each camshaft (11) and can be driven by a separate drive shaft (14).

Gas exchange valve control system (10) for an internal combustion engine, in particular for a large internal combustion engine, with at least one camshaft (11) which carries intake cams (12) for actuating the intake valves and exhaust cams (13) for actuating the exhaust valves for a cylinder group of adjacent cylinders, wherein in a first variant the intake cams (12) and in a second variant the exhaust cams (13) are arranged non-rotatably on the respective camshaft (11) and can be driven by the respective camshaft (11), and wherein in the first variant the exhaust cams (13) and in the second variant the intake cams (12) are rotatably mounted on the respective camshaft (11) and can be driven by a separate drive shaft (14).

Internal combustion engine processes, including: Setting an internal combustion engine torque actuator based on the internal combustion engine oil temperature (EOT), estimated by applying an excitation signal, comprising a pulse-width modulated duty cycle, a voltage and an electric current, applied to a solenoid valve (OCV) of a variable cam control (VCT) device, and using an associated relationship stored in non-volatile memory (110) that controls the camshaft solenoid duty cycle and relates the camshaft angular velocity of the device to the combustion engine oil temperature (EOT), wherein the adjustment is made in response to degradation of a sensor used to measure the combustion engine oil temperature (EOT) directly or indirectly, and damage to the non-volatile memory (110), wherein the non-volatile memory (110) includes a keep-alive memory (KAM) of a combustion engine control unit (12), wherein the sensor includes one or more of an combustion engine oil temperature sensor (EOT) coupled to an oil pan, a combustion engine coolant temperature sensor (ECT), an air charge temperature sensor (ACT), and a mass airflow sensor (MAF).

To provide a valve opening / closing timing control device capable of reducing noise or vibration during operation of an internal combustion engine.SOLUTION: A valve opening / closing timing control device 100 comprises: a driving-side rotor A which is rotated synchronously with a crankshaft 1 of an internal combustion engine E; a driven-side rotor B which is rotated integrally with a camshaft 2 of the internal combustion engine E; and a phase adjustment mechanism C which sets relative rotation phases of the driving-side rotor A and the driven-side rotor B. The driven-side rotor B has a support wall part 21 which is connected to an end of the camshaft 2. The support wall part 21 has a supply oil path 21a in which a lubricant can be supplied from the outside into the driven-side rotor B. The valve opening / closing timing control device has an oil sump structure Z in which, when the driving-side rotor A is being rotated, a discharge amount of the lubricant to be discharged from the inside of the driving-side rotor A is reduced in relative to a supply amount of the lubricant supplied from the supply oil path 21a to the inside of the driven-side rotor B.SELECTED DRAWING: Figure 1

A valve opening and closing timing control device includes a drive-side rotating body that rotates synchronously with a crankshaft of an internal combustion engine about a rotation axis, a driven-side rotating body that is disposed coaxially with the rotation axis and inside the drive-side rotating body, and rotates integrally with a camshaft for opening and closing a valve of the internal combustion engine, a phase adjustment mechanism that includes plural gears for reducing a driving rotational force of an electric motor and sets a relative rotational phase between the drive-side rotating body and the driven-side rotating body, a lubricating oil supply unit that supplies lubricating oil to the phase adjustment mechanism from outside, and an oil discharge control unit that performs oil discharge control of discharging lubricating oil by changing the relative rotational phase by driving the electric motor in accordance with stop control of stopping the internal combustion engine.

Gas exchange valve actuation system (10) for an internal combustion engine, in particular for a large internal combustion engine, with at least one camshaft (11) which carries intake cams (12) for actuating the intake valves and exhaust cams (13) for actuating the exhaust valves for a cylinder group of adjacent cylinders, wherein in a first embodiment the intake cams (12) and in a second embodiment the exhaust cams (13) are arranged non-rotatably on the respective camshaft (11) and can be driven by the respective camshaft (11), and wherein in the first embodiment the exhaust cams (13) and in the second embodiment the intake cams (12) are rotatably mounted on the respective camshaft (11) and can be driven by a separate drive shaft (14). Fig. 1

The invention relates to a gas exchange valve control system (10) for an internal combustion engine, in particular for a large internal combustion engine, comprising at least one camshaft (11) which carries an intake cam (12) for controlling an intake valve and an exhaust cam (13) for controlling an exhaust valve for a cylinder group of cylinders arranged next to one another, wherein the intake cam (12) in the first variant and the exhaust cam (13) in the second variant are arranged non-rotatably on the respective camshaft (11) and can be driven by the respective camshaft (11), and wherein the exhaust cam (13) in the first variant and the intake cam (12) in the second variant are rotatably mounted on the respective camshaft (11), and can be driven by a separate drive shaft (14).

The present disclosure relates to an engine assembly for a vehicle. The engine assembly comprises an engine including a cylinder head and an engine block. The engine block comprises a cylinder block and a crankcase having a crankshaft. The engine may be used in different models of the vehicle having different characteristics by interchanging or replacing the cylinder head from a plurality of cylinder heads and / or a cylinder block from a plurality of cylinder blocks, while keeping one or more engine components such as the crankcase, a timing chain, or a valve cover the same. Accordingly, the engine is adaptable to different vehicles.

An oil supply apparatus includes a variable capacity oil pump 81, a hydraulic pressure detection section 50a detecting a hydraulic pressure in an oil supply passage 5, an oil control valve 84 changing an oil discharge amount, a mechanical relief valve 81z partially discharging oil to outside of the oil supply passage when a discharge hydraulic pressure of the oil pump exceeds an upper limit pressure, a temperature detection section 50b detecting a temperature of an engine, and a control section 60. When the temperature is equal to or higher than a set temperature, the oil control valve is subject to feedback control such that the hydraulic pressure matches a target hydraulic pressure. When the temperature is lower than the set temperature, the feedback control is prohibited, and the oil control valve is controlled such that an oil discharge amount becomes a maximum amount.

Valve opening / closing time control device (1) with: a drive-side rotating component (A) which is rotatably arranged about a rotational axis (X) and rotates synchronously with a crankshaft (2) of an internal combustion engine (E); a driven-side rotary component (B) which is rotatably arranged about the axis of rotation (X) and is integrally connected with a camshaft (3) for opening and closing a valve (3B) of the internal combustion engine (E) in a state in which the driven-side rotary component (B) is rotatable relative to the drive-side rotary component (A); a phase adjustment mechanism (C) that specifies a relative rotational phase between the drive-side rotary component (A) and the driven-side rotary component (B) by means of a drive force of an electric actuator (M), wherein the phase adjustment mechanism (C) comprises a ring gear (21), an inner gear (22) and a drive shaft (24), the ring gear (21) being arranged coaxially with the axis of rotation (X) and having an internal toothed section (21A), the inner gear (22) being arranged coaxially with an eccentric axis (Y) arranged parallel to the axis of rotation (X) and having an external toothed section (22A) which engages with a portion of the internal toothed section (21A) of the ring gear (21), the drive shaft (24) being fitted into the inner gear (22) and being coaxial with the axis of rotation (X), the phase adjustment mechanism (C) being designed as a differential reduction gear mechanism in which the inner gear (22) rotates about the axis of rotation (X) while in a state in which the drive shaft (24) is driven by a driving force of the electric actuator (M) to rotate about the axis of rotation (X) is driven to rotate around the eccentric axis (Y); a preloading component (25) provided on an outer circumference of the drive shaft (24), wherein the preloading component (25) exerts a preload force to engage the external toothed section (22A) of the inner gear (22) with the internal toothed section (21A) of the ring gear (21); and a limiting section (R) which is provided on the drive shaft (24) to limit a displacement of the inner wheel (22) in a direction in which the inner wheel (22) is separated from the ring gear (21) against the preload force of the preloading component (25), in which the drive shaft (24) has an eccentric surface (24BS) defined with respect to the eccentric axis (Y) and in which a recessed section (24D) is provided, wherein a spring (25) serving as the preload element is fitted into the recessed section (24D), the boundary section (R) is formed by at least one of opposite outer edge sections of the recess section (24D) in a circumferential direction of the eccentric surface (24BS), wherein at least one of the opposite outer edge sections projects outwards in a radial direction.

A rotary valve internal combustion engine A rotary valve internal combustion engine has a piston (1) connected to a crankshaft (3) and reciprocatable in a cylinder (2), a combustion chamber (4) being defined in part by the piston. The engine has a rotary valve (5) rotatable in a valve housing (8) fixed relative to the cylinder (2), the rotary valve having a valve body containing a volume (9) defining, in part, the combustion chamber 4 and further having in a wall part (11) thereof a port (12) giving, during rotation of the valve, fluid communication successively to and from the combustion chamber via inlet and exhaust ports (13, 14) in the valve housing. The valve body has a non-uniform radial profile along its axial length and / or about its axis of rotation to accommodate changes in the profile of the valve body during operation to maintain a substantially constant clearance between the valve body and the housing throughout the length of the valve body.