Aisin Seiki Kabushiki Kaisha

Naoto Toma

Shigemitsu Suzuki

Hiroki Mukaide

Masaki Kobayashi

Yasutaka Miura

Takeo Asahi

Kazuo Ueda

Takeshi Hashizume

Hiroyuki Amano

Eiji Miyachi

Yuichi Kato

Kenji Ikeda

Yoshiaki Yamakawa

Toru Fujikawa

Yoji Kanada

Takeshi Hayashi

Shigeharu Yamamoto

This disclosure reliably causes transition to a locked state at the time of internal combustion engine deactivation and reliably causes transition to the locked state when a locking mechanism is not in the locked state at the time of internal combustion engine activation. A control valve spool is operable to a phase control position in which the supply/discharge of a fluid to/from an advance port and a retard port is controlled while the fluid is supplied to a lock releasing port, and to a lock transition position in which the supply/discharge of the fluid to/from the advance port and the retard port is controlled while the fluid is discharged from the lock releasing port. A communication path through which a portion of the fluid from a pump port is discharged to a drain port when the spool is operated to the lock transition position is formed.

Control valve

Provided is a valve opening/closing timing control device that can speedily achieve a stable operation at the time of starting an engine. The device includes a drive-side rotating body that is rotated in synchronism with a crankshaft and has a plurality of projecting portions, a driven-side rotating body that has a partition portion which forms an advance angle chamber and a retard angle chamber and that is rotated together with a camshaft for valve opening/closing, an intermediate lock mechanism switchable between a locked state and an unlocked state, a pump for supplying fluid to the advance angle chamber, the retard angle chamber or the intermediate lock mechanism, and a communication passage configured to establish communication between the advance angle chamber and the retard angle chamber disposed adjacent in a circumferential direction when the intermediate lock mechanism is under the locked state.

Valve opening/closing timing control device

A valve timing control apparatus includes: a drive-side rotational member synchronously rotating with a drive shaft of an internal combustion engine; a driven-side rotational member disposed inside the drive-side rotational member and integrally rotating with a valve opening/closing camshaft; a hydrostatic pressure chamber formed by partitioning a space between the drive-side rotational and driven-side rotational members; an advance angle chamber and a retardation angle chamber formed by dividing the hydrostatic pressure chamber; an intermediate lock mechanism able to selectively switch between locked and unlocked states; an advance angle flow path allowing the hydraulic fluid to be circulated; a retardation angle flow path allowing the hydraulic fluid to be circulated; a control valve having a spool; and a phase control unit controlling the control valve.

Valve timing control apparatus

A control valve includes a valve case, a spool accommodated in the valve case, an electromagnetic solenoid operating the spool along a spool axis extending in a longitudinal direction, the valve case including a pump port, an advanced angle port, a retarded angle port, and an unlocking port, the spool being operated to at least five positions, and a lock control fluid passage formed inside the spool in an attitude along the spool axis, the lock control fluid passage allowing the fluid from the pump port to be supplied only to the unlocking port irrespective of the position of the spool when the spool is operated to any one of the positions at which the fluid is supplied from the pump port to the unlocking port.

A control valve includes a spool formed with a fluid passage allowing a circulation of an operation fluid for switching a supply of the operation fluid to plural operation fluid supply portions, a cylindrical sleeve including plural supply and exhaust ports supplying and exhausting the operation fluid to and from the plural operation fluid supply portions and plural drain ports allowing the operation fluid returning from the plural operation fluid supply portions to drain, the sleeve slidably accommodating the spool therein, a solenoid mechanism for changing a position of the spool relative to the sleeve, and a communication portion formed on an outer periphery surface of the sleeve, the communication portion connected to plural drain ports.

Control valve and attachment structure of control valve

A valve opening and closing time control apparatus includes;

Valve opening and closing control apparatus

An internal combustion engine includes a variable valve timing control apparatus including a driving-side rotating member rotating about a rotary axis by rotational force transmitted from a crankshaft, a driven-side rotating member including at least one fluid pressure chambers partitioned and formed with at least one advanced angle chambers and at least one retarded angle chambers and integrally rotating with a camshaft for opening and closing a valve, and a lock mechanism configured with a lock member provided at one of the driving-side rotating member and the driven-side rotary member to be engageable and disengageable with a recessed portion formed at the other of the driving-side rotating member and the driven-side rotary member, and an engine control unit for stopping the internal combustion engine to position a portion where the lock mechanism is formed below a virtual line passing through the rotary axis when the internal combustion engine is stopped.

Internal combustion engine

A valve opening-closing timing control apparatus includes a partition portion partitioning a fluid pressure chamber into an advanced angle chamber and a retarded angle chamber, a phase control portion controlling a rotational phase of a driven-side rotational member relative to a driving-side rotational member, a lock mechanism including a lock member and a lock recess for locking the rotational phase at a predetermined phase, a lock control portion switching the lock mechanism between a locked state and an unlocked state by supplying and discharging a pressurized fluid to and from the lock recess, a phase controlling supply passage supplying the pressurized fluid to the advanced angle chamber and the retarded angle chamber, a lock controlling supply passage supplying the pressurized fluid to the lock recess, and a one-way valve blocking the pressurized fluid supplied to the lock controlling supply passage from flowing into the phase controlling supply passage.

Valve opening-closing timing control apparatus

A valve timing control apparatus includes a driving-side rotation member, a driven-side rotation member, a fluid chamber, an advanced angle chamber and a retarded angle chamber, a fluid control valve portion controlling supply and discharge of fluid relative to each of the advanced angle chamber and the retarded angle chamber, an accumulator accumulating a portion of fluid supplied to the fluid control valve portion from a pump at a fluid storage portion during an operation of an internal combustion engine and supplying fluid accumulated at the fluid storage portion to the fluid control valve portion at a start of the internal combustion engine, and a supply flow passage connecting the pump, the fluid control valve portion, and the accumulator in series. The accumulator includes a relief control valve portion configured to maintain a pressure of fluid accumulated at the fluid storage portion equal to or smaller than a predetermined value.

A variable valve timing control apparatus includes a driving-side rotating member, an driven-side rotating member, a cam shaft, a control valve switching supply and discharge of a working fluid relative to an advanced angle chamber and a retarded angle chamber, an advanced angle-side oil passage, a retarded angle-side oil passage, a spider provided with a first oil passage and a second oil passage, a seal mechanism partitioning between at least one of the first oil passage and the second oil passage, and an outside space, and the seal mechanism allows air to come in the at least one of the first oil passage and the second oil passage in a case where pressure inside the at least the one of the first oil passage and the second oil passage is lower than air pressure of the outside space.

Variable valve timing control apparatus

A valve timing control apparatus includes a driving-side rotation member, a driven-side rotation member, a fluid chamber, an advanced angle chamber and a retarded angle chamber, a fluid control mechanism, a first intermediate lock mechanism configured to selectively lock a relative rotation phase of the driven-side rotation member relative to the driving-side rotation member at a first intermediate lock phase and release a locked state of the relative rotation phase at the first intermediate lock phase, a most retarded angle lock mechanism configured to selectively lock the relative rotation phase at a most retarded angle lock phase and release a locked state of the relative rotation phase at the most retarded angle lock phase, and a second intermediate lock mechanism configured to selectively lock the relative rotation phase at a second intermediate lock phase and release a locked state of the relative rotation phase at the second intermediate lock phase.

A variable valve timing control apparatus includes a driving rotor, a driven rotor coaxially arranged with the driving rotor, a fluid pressure chamber defined between the driving rotor and the driven rotor, a partition portion arranged at one of the driving rotor and the driven rotor and dividing the fluid pressure chamber into advanced and retarded angle chambers, a first fluid control mechanism controlling supply and discharge of a hydraulic fluid to and from the fluid pressure chamber, a first phase restriction portion restricting and releasing a relative rotational phase between the driving rotor and the driven rotor within and from a first restriction range, a second phase restriction portion restricting and releasing the relative rotational phase within and from a second restriction range, and a second fluid control mechanism controlling the supply and discharge of the hydraulic fluid to and from the first and second phase restriction portions individually.

A valve timing control apparatus includes a driving side rotational member, a driven side rotational member, a fluid pressure chamber, a dividing portion formed at the other one of the driving side rotational member and the driven side rotational member so as to divide the fluid pressure chamber into an advanced angle chamber and a retarded angle chamber, and a fluid control valve portion arranged orthogonally relative to the camshaft at an opposite side of the camshaft so as to dispose the driving side rotational member and the driven side rotational member between the fluid control valve portion and the camshaft, the fluid control valve portion including a first linearly moving member linearly moving in an orthogonal direction relative to the camshaft, thereby controlling supplying and discharging of a fluid relative to the advanced angle chamber and the retarded angle chamber.

A valve timing control apparatus includes a driving-side rotating member, a driven-side rotating member arranged coaxially with the driving-side rotational member so as to be rotatable relative to the driving-side rotating member, a retarded angle chamber and an advanced angle chamber, each of which is defined by the driving-side rotating member and the driven-side rotating member, a lock mechanism locking a relative rotational phase of the driven-side rotating member at a predetermined phase between a most advanced angle phase and a retarded angle phase, an operation fluid supply-and-discharge mechanism supplying/discharging an operation fluid to/from the retarded angle chamber, the advanced angle chamber and the lock mechanism, and a first air inlet mechanism for connecting one of the retarded angle chamber and the advanced angle chamber to an outside of the valve timing control apparatus in order to allow air to flow thereinto.

A valve opening/closing timing control apparatus includes a phase displacing mechanism for displacing relative phase between a drive-side rotational member and a driven-side rotational member rotatable in unison with a cam shaft, a first pump driven by an internal combustion engine, a second pump driven by a drive source different from the internal combustion engine, a locking mechanism capable of locking the relative phase to an initial phase suitable for starting the internal combustion engine, and an urging mechanismfor urging the phase displacing mechanism in the advancing direction between the most retarding phase and the initial phase, a minimal urging force of the urging mechanism being set so as to override the displacing force toward the retarding phase side at the minimal pressure.

Growing community of inventors

Kariya, Japan

Naoto Toma