Abstract: A variable valve timing control device includes a driving side rotational member (2) synchronously rotating with a crankshaft, a driven side rotational member (1) positioned coaxially with the driving side rotational member, and synchronously rotating with a camshaft, a fluid pressure chamber (40), formed in at least one of the driving side rotational member and the driven side rotational member, for generating a biasing force for changing a relative rotational phase between the driving side rotational member and the driven side rotational member by hydraulic fluid supplied into or discharged from the fluid pressure chamber, a lock mechanism (6) movable between a lock position for preventing a relative rotation between the driving side rotational member and the driven side rotational member and a lock release position for allowing the relative rotation, a lock release pressure chamber (62) for generating a biasing force to move the lock mechanism (6) to the lock release position by supply of the hydraulic flu

Abstract: A variable valve timing control device includes a driving side rotational member (2) synchronously rotating with a crankshaft, a driven side rotational member (1) positioned coaxially with the driving side rotational member, and synchronously rotating with a camshaft, a fluid pressure chamber (40), formed in at least one of the driving side rotational member and the driven side rotational member, for generating a biasing force for changing a relative rotational phase between the driving side rotational member and the driven side rotational member by hydraulic fluid supplied into or discharged from the fluid pressure chamber, a lock mechanism (6) movable between a lock position for preventing a relative rotation between the driving side rotational member and the driven side rotational member and a lock release position for allowing the relative rotation, a lock release pressure chamber (62) for generating a biasing force to move the lock mechanism (6) to the lock release position by supply of the hydraulic flu

Abstract: A valve timing control apparatus for controlling an opening and closing timing of a valve of an internal combustion engine includes a driving side rotational member synchronously rotated with a crankshaft, a driven side rotational member provided coaxially with the driving side rotational member and synchronously rotated with a camshaft, a fluid pressure chamber being separated into an advanced angle chamber and a retarded angle chamber, a phase control apparatus for displacing a relative rotational phase between the driving side rotational member and the driven side rotational member, a locking mechanism having a movable member, a judging device for judging a supply condition of the operation fluid relative to the fluid pressure chamber, and a control device for controlling a rotational speed of the crankshaft.

Abstract: In a valve timing control apparatus, a relative rotational phase between a drive rotational member rotated with a crankshaft and a driven rotational member rotated with a camshaft is controlled by a relative rotational phase-controlling mechanism utilizing a fluid pressure in a fluid pressure chamber divided by a vane. The relative rotational phase can be restrained by a locking mechanism at an intermediate phase between most advanced and most retarded angle phases. As a minimum set torque applied by a biasing mechanism to the drive rotational member relative to the driven rotational member, a larger minimum torque required for change from the most retarded angle phase to the intermediate phase during cranking, at a temperature before warming up while fluid pressure is discharged, or at a minimum temperature for relative rotational phase control while a fluid pressure remains, is selected.

Abstract: In a valve timing control apparatus, a relative rotational phase between a drive rotational member rotated with a crankshaft and a driven rotational member rotated with a camshaft is controlled by a relative rotational phase-controlling mechanism utilizing a fluid pressure in a fluid pressure chamber divided by a vane. The relative rotational phase can be restrained by a locking mechanism at an intermediate phase between most advanced and most retarded angle phases. As a minimum set torque applied by a biasing mechanism to the drive rotational member relative to the driven rotational member, a larger minimum torque required for change from the most retarded angle phase to the intermediate phase during cranking, at a temperature before warming up while fluid pressure is discharged, or at a minimum temperature for relative rotational phase control while a fluid pressure remains, is selected.

Abstract: A valve timing control apparatus for controlling an opening and closing timing of a valve of an internal combustion engine includes a driving side rotational member synchronously rotated with a crankshaft, a driven side rotational member provided coaxially with the driving side rotational member and synchronously rotated with a camshaft, a fluid pressure chamber being separated into an advanced angle chamber and a retarded angle chamber, a phase control apparatus for displacing a relative rotational phase between the driving side rotational member and the driven side rotational member, a locking mechanism having a movable member, a judging device for judging a supply condition of the operation fluid relative to the fluid pressure chamber, and a control device for controlling a rotational speed of the crankshaft.

Abstract: A variable valve timing control device which includes a driving side rotational member, a driven side rotational member, a rotational phase holding mechanism for holding a relative rotational phase between the driving side rotational member and the driven side rotational member at a locked phase, a rotational phase restriction mechanism for allowing and restricting the relative rotation, a groove formed at one of the rotational members, a restriction body provided at the rotational phase restriction mechanism for restricting the relative rotation, a plurality of said rotational phase restriction mechanisms for restricting the relative rotation in a predetermined direction at different relative rotational phases, a step portion provided at the groove being engaged with the restriction body for restricting the relative rotation in the predetermined direction, and the rotational phase restriction mechanism including the step portion for restricting the relative rotation in the predetermined direction at the plur

Abstract: A variable valve timing control device which includes a driving side rotational member, a driven side rotational member, a rotational phase holding mechanism for holding a relative rotational phase between the driving side rotational member and the driven side rotational member at a locked phase, a rotational phase restriction mechanism for allowing and restricting the relative rotation, a groove formed at one of the rotational members, a restriction body provided at the rotational phase restriction mechanism for restricting the relative rotation, a plurality of said rotational phase restriction mechanisms for restricting the relative rotation in a predetermined direction at different relative rotational phases, a step portion provided at the groove being engaged with the restriction body for restricting the relative rotation in the predetermined direction, and the rotational phase restriction mechanism including the step portion for restricting the relative rotation in the predetermined direction at the plur

Abstract: A variable valve timing control device includes a drive member rotatable in synchronization with a crankshaft, a rotatable driven member connected to a camshaft arranged co-axially with the drive member, a hydraulic chamber formed at one of the drive member and the driven member, a vane dividing the hydraulic chamber into an advanced angle chamber and a retarded angle chamber, a relative rotation phase controlling mechanism which controls a relative rotation phase between the drive member and the driven member between a most retarded angle phase in which a volume of the advanced angle chamber is a maximum and a most advanced angle phase in which a volume of the retarded angle chamber is a maximum by supplying or discharging operation fluid to and/or from the advanced angle chamber and the retarded angle chamber, a lock mechanism which restricts relative rotation between the drive member and the driven member, when the relative rotation phase is a predetermined lock phase between the most advanced angle phase

Abstract: A variable valve timing control apparatus includes a relative rotation control mechanism and a fluid pressure passage. The relative rotation control mechanism restrains a relative rotation between a rotor and a housing at an intermediate phase position between the most advanced angle phase position and the most retarded angle phase position. The fluid pressure passage includes a first fluid path for supplying the fluid to the relative rotation control mechanism and for draining the fluid therefrom and a second fluid path for supplying the fluid to an advance angle chamber and a retard angle chamber and for draining the fluid therefrom. The first fluid path is defined independently of the second fluid path.

Abstract: A variable valve timing control device includes a drive member rotatable in synchronization with a crankshaft, a rotatable driven member connected to a camshaft arranged co-axially with the drive member, a hydraulic chamber formed at one of the drive member and the driven member, a vane dividing the hydraulic chamber into an advanced angle chamber and a retarded angle chamber, a relative rotation phase controlling mechanism which controls a relative rotation phase between the drive member and the driven member between a most retarded angle phase in which a volume of the advanced angle chamber is a maximum and a most advanced angle phase in which a volume of the retarded angle chamber is a maximum by supplying or discharging operation fluid to and/or from the advanced angle chamber and the retarded angle chamber, a lock mechanism which restricts relative rotation between the drive member and the driven member, when the relative rotation phase is a predetermined lock phase between the most advanced angle phase

Abstract: A valve timing control device is provided, which has an advantageous point of locking a relative rotation phase at an intermediate phase based on an engine halt signal. The valve opening-closing timing control device has a relative rotation control mechanism including the first path for supplying or discharging oil to or from the retard angle chamber and the advance angle chamber and for moving a relative rotation phase between the retard angle chamber and the advance angle chamber in the range between the most retarded angle phase and the most advanced angle phase. The relative rotation control mechanism has a lock oil passage for actuating lock portions for locking the relative rotation phase at the intermediate phase between the most retarded angle phase and the most advanced angle phase. The second path is provided separately from the first path. The second path supplies oil to and discharges oil from a lock oil passage.

Abstract: A valve timing control device is provided, which has an advantageous point of locking a relative rotation phase at an intermediate phase based on an engine halt signal. The valve opening-closing timing control device has a relative rotation control mechanism including the first path for supplying or discharging oil to or from the retard angle chamber and the advance angle chamber and for moving a relative rotation phase between the retard angle chamber and the advance angle chamber in the range between the most retarded angle phase and the most advanced angle phase. The relative rotation control mechanism has a lock oil passage for actuating lock portions for locking the relative rotation phase at the intermediate phase between the most retarded angle phase and the most advanced angle phase. The second path is provided separately from the first path. The second path supplies oil to and discharges oil from a lock oil passage.

Abstract: A variable valve timing control device includes a relative rotation control mechanism restricting relative rotation between the housing member and the rotor member at an intermediate phase position between a most advanced angle phase position and a most retarded angle phase position, and a hydraulic pressure circuit which controlling supply and discharge of operation fluid with respect to advance and retarded angle hydraulic chambers while also controlling supply and discharge of operation fluid for the relative rotation control mechanism. The hydraulic pressure circuit includes a variable type spool valve adapted to discharge the operation fluid from the advance and retarded angle chambers and from the relative rotation control mechanism. The variable type spool valve has different discharge opening widths at a both drain function region in which the operation fluid can be drained from the advanced and retarded angle hydraulic chambers.

Abstract: A variable valve timing control apparatus includes a relative rotation control mechanism and a fluid pressure passage. The relative rotation control mechanism restrains a relative rotation between a rotor and a housing at an intermediate phase position between the most advanced angle phase position and the most retarded angle phase position. The fluid pressure passage includes a first fluid path for supplying the fluid to the relative rotation control mechanism and for draining the fluid therefrom and a second fluid path for supplying the fluid to an advance angle chamber and a retard angle chamber and for draining the fluid therefrom. The first fluid path is defined independently of the second fluid path.

Abstract: A variable valve timing control device includes a relative rotation control mechanism restricting relative rotation between the housing member and the rotor member at an intermediate phase position between a most advanced angle phase position and a most retarded angle phase position, and a hydraulic pressure circuit which controlling supply and discharge of operation fluid with respect to advance and retarded angle hydraulic chambers while also controlling supply and discharge of operation fluid for the relative rotation control mechanism. The hydraulic pressure circuit includes a variable type spool valve adapted to discharge the operation fluid from the advance and retarded angle chambers and from the relative rotation control mechanism. The variable type spool valve has different discharge opening widths at a both drain function region in which the operation fluid can be drained from the advanced and retarded angle hydraulic chambers.

Abstract: A variable valve timing system includes a first controlling mechanism through which operation fluid is supplied to and discharged from an advanced angle chamber to restrict the relative rotation to an advanced angle side at the lock phase, and a second controlling mechanism through which operation fluid is supplied to and discharged from a retarded angle chamber to restrict the relative rotation to a retarded angle side at the lock phase. The variable valve timing system further includes passages which function as a throttle at the lock phase to connect the advanced angle chamber with the first controlling mechanism and the retarded angle chamber with the second controlling mechanism.

Abstract: A variable valve timing system includes a relative rotation controlling mechanism restricting relative rotation of a housing member and a rotor member at the intermediate lock phase between the most advanced angle phase and the most retarded angle phase. An auxiliary controlling mechanism actuated in response to the operation fluid to be supplied to and discharged from a fluid pressure circuit allows the relative rotation of the housing member and the rotor member under the unlock condition and restricts the rotation of the rotor member to the retarded angle side or to the advanced angle side relative to the housing member at a set phase between the most retarded angle phase or the most advanced angle phase and the intermediate lock phase under the lock condition.

Abstract: A variable valve timing system includes a hydraulic pressure circuit for controlling an operation fluid supply/discharge of the relative rotation controlling mechanism and for controlling an operation fluid supply/discharge of each of the advanced angle chamber and the retarded angle chamber. The hydraulic pressure circuit, upon initiation of the internal combustion engine, discharges the operation fluid from the relative rotation controlling mechanism and the advanced and retarded angle chambers until a pressure of the operation fluid reaches a controllable pressure value.

Abstract: A variable valve timing system includes a first controlling mechanism through which operation fluid is supplied to and discharged from an advanced angle chamber to restrict the relative rotation to an advanced angle side at the lock phase, and a second controlling mechanism through which operation fluid is supplied to and discharged from a retarded angle chamber to restrict the relative rotation to a retarded angle side at the lock phase. The variable valve timing system further includes passages which function as a throttle at the lock phase to connect the advanced angle chamber with the first controlling mechanism and the retarded angle chamber with the second controlling mechanism.