Denso Corporation

Toyota Jidosha Kabushiki Kaisha

Hideo Inaba

Toshiki Fujiyoshi

Akihiko Kameshima

Kiyoshi Kimura

Taku Itoh

Shigeru Yoshiyama

Yasuyoshi Suzuki

Jouji Yamaguchi

Joji Yamaguchi

Akira Shibata

Koichi Shimizu

Akira Tsunoda

A feed screw mechanism including a screwed shaft which moves linearly along with the control shaft, and a rotation spindle which rotates in a circumferential direction. The feed screw mechanism converts a rotational movement of the rotation spindle into a linear movement of the screwed shaft. A protrusion protrudes outwardly from the rotation spindle. An internal thread member engages with an outer wall surface of the rotation spindle. A motor stator generating a magnetic is positioned over the rotation spindle, and is sandwiched between the protrusion and the internal thread member in an axial direction of the rotation spindle.

Actuator for valve lift controller

An actuator for a valve lift controller comprises a case forming a first and second spaces therein. The first space is supplied with lubricating fluid. The actuator further comprises a feed screw mechanism including a cylindrical spindle and a screw, and converts a rotational movement of the spindle to a linear movement of the screw. The spindle includes a first end portion open to the first space and a second end portion closed to the second space therein. The screw straddles borders between an interior of the spindle, the first space, and an external space. The actuator includes a motor unit which is located in the second space and rotates the spindle. The actuator further includes a sealing member sealing a gap between the case and the spindle to separate the first and second spaces.

An actuator for a valve lift controller linearly driving a control shaft of a changing mechanism comprises a feed screw mechanism including a screwed shaft linearly moving along with the control shaft, and a rotation spindle rotating coaxially with the screwed shaft. The feed screw mechanism converts a rotational movement of the rotation spindle into a linear movement of the screwed shaft. Moreover, the actuator comprises a unit attached to the rotation spindle, an electric power distributor located at an opposite side of the screw mechanism relative to the changing mechanism, and an stopper member restricting a movement of the unit in the axial direction from an electric power distributor to the unit.

An actuator for a valve lift control device linearly moves a control shaft to change a valve lift in accordance with an axial position of the control shaft. A first and a second rotation cam integrally rotate around a common rotation axis by transmission of torque, so that a direct acting follower, which includes a first and a contact members, linearly moves with a control shaft. The first and a second rotation cams are respectively in contact with the first and the second contact members via a first and a second contact points. The first contact point is located on the opposite side of the second contact point with respect to the rotation axis. A sum of a first rotation cam lift of the first rotation cam and a second rotation cam lift of the second rotation cam is substantially constant in a predetermined rotation angular range of the first rotation cam and the second rotation cam.

Actuator for valve lift control device having cam mechanism

A driving cam includes a circular surface portion at an outer cam surface thereof. When an engine is turned off, the circular surface portion is brought into contact with a roller. Thereby, even if a load is applied to the control axis member, no rotational force is circumferentially applied to the driving cam. As the result, even if a driving force is not applied from a motor to the driving cam, a rotational angle of the driving cam and an axial position of the control axis member are kept constant. Therefore, it is possible to keep the driving cam and the control axis member at a constant position without adding a complicated mechanism.

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Okazaki, Japan

Hideo Inaba