Variable valve actuation apparatus for internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorAkio Kidooka
Life of this patent
Estimating the term…
Abstract
A variable valve actuation apparatus for an internal combustion engine includes a first link arm which has a projected portion that is engageable with and disengageable from a guide rail, and which is displaceable in the axis direction of a camshaft, and a link shaft linked to the first link arm in such a manner as to allow rotation but constrain movement in the axis direction. When an electro-magnetic solenoid is electrified, the first link arm rotates about the link shaft so that the projected portion engages with the guide rail. In association with the displacement of the link arms that occurs during the engagement, the state of motion of second rocker arms changes, so that the opening characteristic of valves provided for each cylinder is switched.
Claims6
A variable valve actuation apparatus for an internal combustion engine comprising:
- transfer members that are disposed between cams and valves and that transfer operating force of the cams to the valves;
- a camshaft on which the cams are provided;
- a guide rail provided on an outer peripheral surface of a cylindrical portion that is provided on the camshaft;
- a main displacement member which has an engagement portion that is engageable with and disengageable from the guide rail and which is displaceable in an axis direction of the camshaft;
- a member-linked shaft which is linked to the main displacement member in such a manner that, relative to the member-linked shaft, the main displacement member is allowed to rotate and is constrained from moving in the axis direction;
- and
- an actuator that produces drive force for engaging the engagement portion of the main displacement member with the guide rail, wherein when the actuator operates, the main displacement member rotates about the member-linked shaft so that the engagement portion engages with the guide rail, and in association with displacement of the main displacement member and the member-linked shaft that occurs when the engagement portion and the guide rail are engaged, state of motion of the transfer member changes so that opening characteristic of the valves that are provided for at least two cylinders is switched.
Dependencies are inferred from the claim text.