Variable valve actuating apparatus for internal combustion engine and control shaft for variable valve actuating apparatus
AssigneeHitachi, Ltd.
InventorsMakoto Nakamura, Seinosuke Hara, Seiji Tsuruta, Mikihiro Kajiura
Life of this patent
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Abstract
A variable valve actuating apparatus for an internal combustion engine includes: a control shaft rotatably supported through a bearing to a body of the engine, and arranged to rotate about a center axis to control an operating state of an engine valve, the control shaft including; a control cam having a center which is off the center axis of the control shaft in a first direction; and a journal portion rotatably supported by the bearing, the journal portion having a center axis which is off the center axis of the control shaft in a second direction different from the first direction of the control cam.
Claims21
A variable valve actuating apparatus for an internal combustion engine, the variable valve actuating apparatus comprising:
- a control shaft rotatably supported through a bearing to a body of the engine, and arranged to rotate about a center axis to control an operating state of an engine valve, the control shaft including;
- a control cam having a center which is off the center axis of the control shaft in a first direction;
- and
- a journal portion rotatably supported by the bearing, the journal portion having a center axis which is off the center axis of the control shaft in a second direction different from the first direction of the control cam.
A variable valve actuating apparatus for an internal combustion engine, the variable valve actuating apparatus comprising:
- a control shaft arranged to rotate about a center axis to control an operating state of an engine valve, the control shaft including;
- a shaft portion extending in an axial direction, and arranged to rotate about a center axis;
- a substantially cylindrical control cam provided on the shaft portion, and arranged to rotate about a center;
- and
- substantially cylindrical journal portions provided on both sides of the control cam in the axial direction, and rotatably supported by bearings provided to a body of the engine, the journal portions having a center axis which is separated from the center axis of the shaft portion, and which is different from the center of the control cam.
A control shaft for a variable valve actuating apparatus, the control shaft arranged to rotate to control an operating state of an engine valve, the control shaft comprising:
- a shaft portion;
- a control cam including an outer circumferential surface which protrudes radially outwards from the shaft portion, whose a protruding quantity varies in accordance with a circumferential direction, and which protrudes in a first direction by a maximum quantity;
- and
- a substantially cylindrical journal portion which is supported by a bearing provided to an engine, and which is eccentric in a second direction different from the first direction of the control cam.
Dependencies are inferred from the claim text.