Hitachi Automotive Systems, Ltd.

Hitachi, Ltd.

Unisia Jecs Corporation

Shinichi Kawada

Atsushi Yamanaka

Ryo Tadokoro

Hiroyuki Nemoto

Naoki Kokubo

Hirofumi Katoh

Yasuo Fujita

Mikihiro Kajiura

Kenzi Ohhara

Seiji Tsuruta

Keisuke Takeda

Tamotsu Todo

Soshiro Kuzunuki

Yasushi Fukunaga

Masafumi Nozawa

Hiroshi Shojima

Motoaki Hirabayashi

Takanori Yokoyama

Kazuyoshi Koga

Kotaro Hirasawa

Hirotsugu Yamagata

Takafumi Oka

Mitsugu Yamada

Isao Doi

Kotofumi Yanai

Seiichi Sue

Kenji Ohhara

Michinori Saito

Koichiro Ono

Kazuhiko Takayanagi

A valve-timing control apparatus varies a relative phase between a cam shaft and a crankshaft by energizing an electric motor through a power-feeding brush provided to be in contact with a slip ring. The valve-timing control apparatus includes a retaining member slidably retaining the power-feeding brush; a connector provided in the retaining member and connected to a power source; a pigtail harness including one end portion connected with the power-feeding brush, and another end portion connected with a terminal of the connector through a fixing portion; and a guide portion provided in the retaining member and including an outer circumferential surface formed in an arc-shape. The pigtail harness bends along the outer circumferential surface of the guide portion. The another end portion extends substantially in a linear arrangement from the fixing portion to a bending portion at which the pigtail harness bends along the outer circumferential surface.

Valve-timing control apparatus for internal combustion engine

A controller of a variable valve apparatus of an internal combustion engine has an engine start indication detecting circuit that detects an indication of an engine start. When the indication of the engine start is detected by the engine start indication detecting circuit in a state in which temperature of the engine is lower than a predetermined temperature, an electric motor provided in the variable valve apparatus is supplied with a current, and this current supply to the electric motor is maintained for a predetermined time from a time point of the detection of the indication of the engine start to an engine cranking start.

Controller of variable valve apparatus of internal combustion engine and variable valve system of internal combustion engine

A valve timing control apparatus includes: an urging member to which a set load is provided to act, to the cam shaft, an urging force from one of the most retard angle position and the most advance angle position toward the intermediate phase position; and a controller configured to sense, as the intermediate phase position, a position at which a relative rotational speed between the driving rotational member and the cam shaft is varied by the relative rotation of the cam shaft beyond a region in which the cam shaft is controlled by the set load of the urging member, when the cam shaft is controlled to be relatively rotated from the one of the most retard angle position and the most advance angle position beyond the intermediate phase position.

Valve timing control apparatus for internal combustion engine and controller for valve timing control apparatus

A valve-timing control apparatus includes a phase change mechanism configured to change a valve timing, a cover member provided near a front end side of the phase change mechanism; slip rings provided to one of a front end portion of the phase change mechanism and a facing surface of the cover member which faces the phase change mechanism; a pair of brushes provided to another of the front end portion of the phase change mechanism and the facing surface of the cover member to be axially slidable. One end portion the pigtail harness is connected with the corresponding brush. Another end portion of the pigtail harness is connected with a connector terminal under a deflected state, at a location radially shifted from an axis of the corresponding brush. The another end portions of the pair of pigtail harnesses are separated from each other by a partition wall.

Valve-timing control apparatus of internal combustion engine and cover member of valve-timing control apparatus

A valve timing control system for an internal combustion engine, comprises: an electric intake valve timing control apparatus to vary an intake valve timing with torque produced by an electric motor with electric power supplied through a power supply mechanism; and an electric exhaust valve timing control apparatus to vary an exhaust valve timing with torque produced by an electric motor with electric power supplied through a power supply mechanism. A heat generating portion in the power supply mechanism of the intake valve timing control apparatus is made of a heat resisting material whereas a heat generating portion in the power supply mechanism of the exhaust valve timing control apparatus is made of a material lower in heat resistance than the heat resisting material of the intake valve timing control apparatus.

Valve timing control system for internal combustion engine

In a valve timing control system for an internal combustion engine, brushes and slip rings are disposed within a space formed between each of an intake air side and an exhaust side device main frames and each of intake air side and exhaust side cover members and partitioned by means of the respective seal members and the respective cover members are configured to enable radial directional position adjustments by a predetermined quantity and are fixed to the internal combustion engine in a state in which the radial directional position adjustments of the respective cover members have been made.

In a variable valve actuation apparatus with a speed reducer between a timing sprocket and a camshaft for changing a phase of the camshaft relative to the sprocket, while reducing normal-rotation/reverse-rotation of an electric motor, the speed reducer includes an eccentric rotation member connected to an output shaft of the motor, an annular member connected to the sprocket, a plurality of rollers installed between an inner toothed portion of the annular member and an outer peripheral surface of the eccentric rotation member, and a cage connected to the camshaft for circumferentially partitioning the respective rollers, while permitting a radial displacement of each roller. Depending on a dimension of a clearance space between the eccentric rotation member and the annular member, a suitable one of a plurality of roller sets, each having a different outside diameter, is selected, and then the selected rollers are installed.

Variable valve actuation apparatus of internal combustion engine

In a valve timing control system of an internal combustion engine employing both an electric-motor-driven intake valve timing control device for changing intake valve timing and an electric-motor-driven exhaust valve timing control device for changing exhaust valve timing, the intake valve timing control device includes a less-friction roller speed reducer having a toothed gear and configured to transmit torque by repeated relocations of each of rollers rolling and relocating from one of two adjacent teeth of the toothed gear to the other. In contrast, the exhaust valve timing control device includes a planetary-gear speed reducer having a friction greater than a friction of the roller speed reducer and configured to transmit torque by meshed-engagement of toothed gears in mesh with each other.

Valve timing control system of internal combustion engine

A valve timing control apparatus for an internal combustion engine, including a drive rotation member, a follower rotation member, an electric motor serving to change a relative rotational phase of the drive rotation member and the follower rotation member, a torsion spring accommodated in an annular accommodation space having an axial closed end which is formed between an inner periphery of the drive rotation member and an outer periphery of the follower rotation member, and a stop plate fixed to the drive rotation member so as to cover a part of an axial open end of the annular accommodation space, the stop plate cooperating with the follower rotation member or a camshaft to restrict relative rotation of the drive rotation member and the follower rotation member within a predetermined angular range.

Valve timing control apparatus for internal combustion engine

A valve-timing control apparatus includes a drive rotating member; a driven rotating member fixed to a cam shaft; an electric motor configured to rotate the driven rotating member relative to the drive rotating member; a motor housing connected integrally with the drive rotating member; a cover member located to face a front portion of the housing; a tubular motor output shaft provided inside the housing to be rotatable relative to the housing; and a plug member fixed to an inner circumferential surface of a tip portion of the tubular motor output shaft and configured to inhibit lubricating oil supplied into the tubular motor output shaft from leaking to an external. The plug member includes a core member formed in a bottomed tubular shape and formed with a through-hole in its bottom portion, and an elastic body coating at least the through-hole and an outer circumferential surface of the core member.

A valve-timing control apparatus includes a drive rotator configured to receive a rotation from a crankshaft; a driven rotator fixed to a cam shaft; and an electric motor. The electric motor includes a stator fixed to the driven rotator, a rotor that rotates relative to the stator, a coil provided to at least one of the stator and the rotor, and a motor output shaft fixed to the rotor. The valve-timing control apparatus further includes a speed-reduction mechanism; a slip ring provided to one of the drive rotator and a fixed member, and configured to feed power to the coil; a power-feeding brush provided to another of the drive rotator and the fixed member, and abutting on the slip ring; a detection-target section provided to one of the fixed member and the motor output shaft, and located on an inner circumferential side beyond a contact portion between the slip ring and the power-feeding brush; and a detecting section provided to another of the fixed member and the motor output shaft, and configured to detect a rotational position of the motor output shaft by detecting a position of the detection-target section.

In a valve timing control apparatus configured to execute phase-control via a phase converter, a controller is configured to control a phase angle of a camshaft relative to a crankshaft during an engine stopping period to a target phase angle differing from a required phase angle suited for an engine operating condition. The controller is further configured to change the phase angle of the camshaft toward the required phase angle during a time period from a point of time when cranking starts to a point of time when detection of a rotational position of the camshaft initiates during an engine restarting period. The controller is still further configured to start feedback-control for the phase angle of the camshaft from the point of time of initiation of detection of the rotational position of the camshaft for bringing the phase angle of the camshaft closer to the required phase angle.

Controller of valve timing control apparatus and valve timing control apparatus of internal combustion engine

An electric motor includes a motor casing formed with a shaft insertion hole and a motor output shaft extending in the shaft insertion hole and projecting to a speed reducing mechanism. An annular oil seal is disposed between the shaft insertion hole and the motor output shaft and the annular oil seal includes an annular seal retainer buried in the annular oil seal for reinforcement. A C-shaped stopper member extending circumferentially from a first end to a second end spaced from the first end, is held in a holding portion or a fitting groove of the shaft insertion hole, and arranged to prevent movement of the oil seal toward the speed reducing mechanism. The stopper member includes a plurality of beam segments confronting the seal retainer from an axial direction of the motor output shaft.

Actuator for variable valve operating apparatus

A variable valve timing control apparatus has a drive rotary member, a driven rotary member fixed to a camshaft, an electric motor relatively rotating a motor drive shaft with respect to the drive rotary member, a speed reduction mechanism transmitting rotation of the motor drive shaft to the driven rotary member a housing connected integrally with the drive rotary member and housing therein the electric motor, a cover member fixed to an engine so as to cover at least a front end part of the housing, a power feed mechanism having a slip ring and a power-feed brush that touches the slip ring and feeding power to the electric motor, and a ring-shaped member. The ring-shaped member is fixed to either one side of the cover member and the motor drive shaft, and makes sliding contact with the other side of the cover member and the motor drive shaft.

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Isehara, Japan

Shinichi Kawada