51results about "Valve camshafts" patented technology

The present disclosure provides a "variable cam timing system and a method for operating the system". A variable cam timing system in an engine is provided. The variable cam timing system includes a camshaft that receives a rotational input from a crankshaft. The camshaft includes: a valve cam that rotationally actuates a valve coupled to a cylinder; and a zero cam that actuates a zero follower including a zero spring that applies a return force on the zero cam during interaction between the zero cam and the zero follower, wherein the zero follower is independent of the cylinder.

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

A fluid control valve unit includes: a fluid control valve including a sleeve that defines an axis and a spool slidably disposed in the sleeve; a passage member including an inner peripheral surface to which the sleeve is fitted, passages, an annular receiving part facing one end of the sleeve, an opening adjacent to the annular receiving part, and an annular groove formed adjacent to the other end of the sleeve and recessed from the inner peripheral surface; a filter member including an elastic part sandwiched between the one end of the sleeve and the annular receiving part and exerting a biasing force in the axial direction; and a snap ring fitted in the annular groove for receiving the other end of the sleeve and detachably receiving the spool.

To secure a smooth motion of a fluid control valve unit.SOLUTION: A fluid control valve unit U includes: a fluid control valve V including a bottomed cylindrical sleeve 70 defining an axis S and a spool 80 accommodated in the sleeve so as to be slidable in an axial direction; a cylindrical passage member 50 having an internal peripheral face 51 with which the sleeve fits, a receiving part 53 for receiving an end part 70a of the sleeve in the axial direction, and an annular groove part 59b which is recessed relative to the internal peripheral face; and a snap ring 110 which has a notched part 110a with a prescribed clearance and which is embedded into the annular groove part such that it regulates falling of the fluid control valve accommodated in the passage member in the axial direction and allows discharge of fluid flowing in a discharge passage formed in the passage member.SELECTED DRAWING: Figure 9

A valve open and close period control device includes: a driving-side rotor that rotates synchronously with a crankshaft of an internal combustion engine; a driven-side rotor that rotates integrally with a camshaft of the internal combustion engine; and a phase adjustment mechanism that sets a relative rotation phase between the driving-side rotor and the driven-side rotor. The driven-side rotor has a support wall portion connected to an end portion of the camshaft, and the support wall portion has an oil supply passage through which lubricating oil can be supplied from an outside to an inside of the driven-side rotor. The valve open and close period control device has an oil reservoir structure that reduces a discharge amount of the lubricating oil discharged from an inside of the driving-side rotor, as compared to a supply amount of the lubricating oil supplied from the oil supply passage to the inside of the driven-side rotor when the driving-side rotor is rotating.

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 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.

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).

A car having: two front wheels; two rear wheels; an internal combustion engine, which is provided with: a plurality of cylinders, where respective pistons slide on the inside, a drive shaft connected to the pistons, a plurality of intake valves and of exhaust valves operated by respective camshafts, and a cylinder head, where the camshafts are arranged; at least one lubrication pump configured to cause a lubricant oil to circulate; and at least one cooling pump configured to cause a coolant liquid to circulate. A camshaft axially projects out of the cylinder head on at least one side, and the lubrication pump is coaxial to the camshaft and is directly connected to the camshaft so as to be caused to rotate by the camshaft.

A valve open and close period control device includes: a driving-side rotor that rotates synchronously with a crankshaft of an internal combustion engine; a driven-side rotor that rotates integrally with a camshaft of the internal combustion engine; and a phase adjustment mechanism that sets a relative rotation phase between the driving-side rotor and the driven-side rotor. The driven-side rotor has a support wall portion connected to an end portion of the camshaft, and the support wall portion has an oil supply passage through which lubricating oil can be supplied from an outside to an inside of the driven-side rotor. The valve open and close period control device has an oil reservoir structure that reduces a discharge amount of the lubricating oil discharged from an inside of the driving-side rotor, as compared to a supply amount of the lubricating oil supplied from the oil supply passage to the inside of the driven-side rotor when the driving-side rotor is rotating.

The present application relates to variable displacement engines including cams with different cam lobe profiles, and provides methods and systems for engines including cams with different cam lobe profiles. In one example, cams of a first cam set actuate multiple deactivatable cylinder valves, and cams of a second cam set actuate multiple non-deactivatable cylinder valves. The cams of the first cam set have different cam profiles relative to the cams of the second cam set.

Valve timing adjustment device (100, 100a-100i) to be installed on an end section of an output shaft (320) located in an axial direction (AD) at one end of the output shaft, wherein the output shaft is configured to receive a drive force transmitted from a drive shaft (310) in an internal combustion machine (300), and the valve timing adjustment device is configured to use hydraulic pressure to adjust the timing of a valve driven by the output shaft such that it opens and closes, wherein the valve timing adjustment device comprises: a housing (120, 120a) configured to rotate synchronously with the drive shaft; a vane rotor (130) which is received in an interior of the housing and divides the interior of the housing into a plurality of hydraulic chambers (140), wherein the vane rotor is configured to be rotated synchronously with the output shaft; a support spring (50, 50e, 50f) configured to bias the vane rotor relative to the housing in a forward displacement direction or a retardation direction, the support spring comprising: a twisted segment (52); an inner end segment (54, 54e) which is joined to one end of the coiled segment and projects inwards in a radial direction (RD); and an outer end segment (56, 56e) which is joined to another end of the coiled segment and projects outwards in the radial direction; and a bushing component (10, 10a, 10c, 10e) that is fixed to the wing rotor, wherein: The bushing component is formed in a stepped cylindrical tubular shape and includes the following: a large-diameter section (15, 15a, 15c, 15e) formed in a cylindrical tubular shape and located on a radially inner side of the coiled segment, the large-diameter section comprising a straight section (25) located on a radially outer surface of the large-diameter section and extending in the axial direction; and a small-diameter section (13) formed in a cylindrical tubular shape and connected to the large-diameter section on an axial side of the large-diameter section on which the output shaft is placed, wherein the small-diameter section is placed on a radially inner side of the housing and has an outer diameter that is smaller than an outer diameter of the large-diameter section; the coiled segment includes a contact section (58, 58f) located on a radially inner surface of the coiled segment and configured to contact the straight section; and a point of an end of the straight section, which is located on one axial side on which the output shaft is placed, coincides in the axial direction with a point of an end of the contact section, which is located on one axial side, or which is one axial side of the point of the end of the contact section.

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).

A valve opening-closing timing control device includes an eccentric member that meshes an external teeth portion of an input gear with an internal teeth portion of an output gear. A concave portion on the eccentric member allows a spring member to be arranged in the concave portion. The spring member applies biasing force of meshing the external teeth portion with the internal teeth portion. The concave portion includes a spring support surface that receives biasing force of the spring member. When viewed in a direction along an eccentric axis, a top surface on the spring support surface has a smaller protrusion amount at a circumferential-direction central position of the spring support surface, as compared to an eccentric arc surface whose center is the eccentric axis.

The present disclosure relates to a cam phase regulator assembly. The cam phase regulator assembly includes a stator, a rotor, and an engine oil control valve. The rotor is rotatably mounted on the radial inner side of the stator, the engine oil control valve comprises a valve core and an elastic piece, and the valve core is mounted on the radial inner side of the rotor in a manner of being movable in the axial direction. The cam phase regulator assembly further includes a retaining plate mounted at an axial end of the rotor. A hydraulic flow channel leading to the rotor is provided on the retaining plate, and the elastic piece is abutted between the retaining plate and the valve core along the axial direction.

To provide a valve opening / closing timing control device capable of appropriately setting valve timing when starting an internal combustion engine at low temperature.SOLUTION: A valve opening / closing timing control device includes: a driving side rotating body that rotates in synchronization with a crankshaft of an internal combustion engine; a driven side rotating body that is disposed on the inner side of the driving side rotating body and integrally rotates with a camshaft for opening / closing a valve of the internal combustion engine; a phase adjustment mechanism that has a plurality of gears for decelerating driving rotating force of an electric motor M and sets a relative rotation phase of the driving side rotating body and the driven side rotating body; a lubrication oil supply section that supplies lubrication oil from outside to the phase adjustment mechanism; and an oil discharge control section 83 that performs oil discharge control for discharging the lubrication oil by changing the relative rotation phase by driving the electric motor M along with stop control for stopping the internal combustion engine.SELECTED DRAWING: Figure 7

Method for joining a component (2) having a recess (8), in particular a cam (4), on a shaft (3), in particular on a camshaft tube, by pressing the component (2) with its recess (8) onto the shaft (3), characterized in that - a minimum coverage (Ü) required in the operating state min ) between the component (2) and the shaft (3), - a manufacturing tolerance (ΔN K ) of the recess (8) of the component (2) and a manufacturing tolerance (ΔR W ) of the shaft (3) is determined, - an overlap value (Ü) from the sum of the tolerances (ΔR W ,ΔN K ) and the minimum coverage (Ü min ) is formed, - the component (2) is heated to such an extent, depending on the contact area value (Ü), that the grooves (9) created during the subsequent pressing of the component (2) onto the shaft (3) do not exceed a predefined depth and the minimum contact area (Ü min ) is ensured when the component (2) has cooled down.

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

Provided is a valve opening / closing timing control device capable of suppressing fluctuations in a spring load even if the position of an internal spring member in a recessed portion fluctuates. A valve opening / closing timing control device is provided with a driving-side rotating body, a driven-side rotating body, and a phase adjustment mechanism. The phase adjustment mechanism is provided with: an internally toothed output gear coaxial with the rotating shaft core (X) and rotating integrally with the driven-side rotating body; an external tooth type input gear disposed on the inner side of the output gear and rotating about an eccentric shaft core (Y); and an eccentric member (26). In a recessed portion (70) of a spring member that engages an input gear and an output gear, a top surface (70af) is formed on a spring support surface (70a) that receives the biasing force of the spring member (71), and when viewed in the direction of an eccentric shaft core (Y), the top surface (70af) has a lower surface area than an eccentric arc surface (Sy) centered on the eccentric shaft core (Y), and the surface area of the top surface (70af) is greater than the surface area of the eccentric arc surface (Sy) centered on the eccentric shaft core (Y). The amount of protrusion at the central position (F) in the circumferential direction of the spring support surface (70a) is small.

A head, for an internal combustion engine, is provided, the head including a base and intake and exhaust assemblies supported by the base and rotatable to open and close intake and exhaust ports formed in the base. The intake and exhaust assemblies each include a plate with an opening therein and rotatable between a position in which the opening in the plate is aligned with and opens one of the intake port and exhaust port and a position in which the plate closes the intake port or exhaust port. Sealing devices provide seals between the plates and the intake and exhaust ports.

The invention relates to a camshaft adjuster for adjusting the phase of a camshaft relative to a crankshaft in a motor vehicle drive train, having a drive element, a driven element rotatable relative to the drive element over a defined angular range, and an output anchor, wherein the output anchor serves to connect the driven element in a torque-proof manner to the camshaft and the driven element is secured to the output anchor by means of a force-fit and / or form-fit connection, wherein at least one radial side of the driven element and / or the output anchor, which acts together with the connection, has a surface-contoured first section and a second section, which is connected to the first section in the circumferential direction and / or in the axial direction, the second section having a constant diameter, the second section being configured annularly and, in the case of a sealing being implemented, surrounds a radial-side output of a hydraulic channel into an access region. The invention also relates to a camshaft adjuster arrangement having a camshaft adjuster and a camshaft.

A valve opening / closing timing control device (100) includes an eccentric member (26) that engages an external gear portion (30A) of an input gear (30) with an internal gear portion (25A) of an output gear (25). A concave portion (70) on the eccentric member (26) allows a spring member (71) to be disposed in the concave portion (70). The spring member (71) applies a biasing force to engage the external gear portion (30A) with the internal gear portion (25A). The concave portion (70) includes a spring support surface (70a) that receives a biasing force from the spring member (71).When viewed in a direction along an eccentric axis (Y), a cover surface (70af) on the spring support surface (70a) has a smaller protrusion amount at a circumferential direction center position (F) of the spring support surface (70a) compared to an eccentric arc surface (Sy) whose center is the eccentric axis (Y).

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.

A control device and a control method for a variable valve timing mechanism are provided so as to improve the accuracy of cam phase angle interpolation without using a motor rotation angle sensor. The control device for the variable valve timing mechanism includes a controller configured to detect a phase angle of a cam based on a cam signal and control the phase angle of the cam by using an electric motor. The controller is configured such that a motor torque estimation unit calculates a motor torque from a motor current based on motor characteristics, a motor rotation-angle estimation unit calculates a motor rotation angle at least based on the motor torque and an engine operating state, and a conversion unit and a feedback control unit interpolate the cam phase angle of the variable valve timing mechanism from the motor rotation angle.

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

A control device for a variable valve control mechanism (14), comprising: a crank angle sensor (4) which outputs a crank angle signal in response to a rotation of a crankshaft (2), wherein the crank angle signal is preset to specify at least two reference positions; a cam sensor (5) which outputs at least two cam signal pulses in response to a rotation of an intake camshaft (3) to open and close an engine valve; an actuator (6) that rotates the intake camshaft (3) relative to the crankshaft (2) so that the actuator (6) can change a rotational phase angle of the intake camshaft (3) relative to the crankshaft (2); and a control unit (7) configured to calculate an actual rotational phase angle of the intake camshaft at the time of detection of the first camshaft signal pulse, based on a first cam signal pulse detected after the start of the starting process and a first reference position of the crankshaft signal detected after the detection of the first cam signal pulse, in order to determine an absolute position (θ1) of the variable valve control mechanism (14), wherein, when the actuator (6) is adjusted during a period from the detection of the first cam signal pulse after the start of the start-up until the detection of the first reference position of the crank angle signal, the control unit (7) is configured to obtain a change amount (θ2) of the actuator (6) from an actuator sensor (15) in order to correct the absolute position (θ1) of the variable valve control mechanism (14) based on the obtained change amount (θ2).

The present disclosure relates to a cam phase regulator assembly. The cam phase regulator assembly includes a stator, a rotor, and an engine oil control valve. The rotor is rotatably mounted on the radial inner side of the stator, the engine oil control valve comprises a valve core and an elastic piece, and the valve core is mounted on the radial inner side of the rotor in a manner of being movable in the axial direction. The cam phase regulator assembly further includes a retaining plate mounted at an axial end of the rotor. A hydraulic flow channel leading to the rotor is provided on the retaining plate, and the elastic piece is abutted between the retaining plate and the valve core along the axial direction.

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).