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US 8,387,576 B2Granted
Engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorYasushi Iwata
Life of this patent
Estimating the term…
Abstract
An oil recovery part (20A, 20B) for guiding oil to an inner side of a peripheral wall of a cylinder head (2) is provided at a front wall upper end of the cylinder head (2), the oil leaking from a concave bearing (3a, 3b) that supports a camshaft (8, 9) provided at a forefront end of a cam housing (3).
Claims9
An engine in which a camshaft is supported rotatably by a cam housing mounted on a cylinder head, comprising:
- an oil recovery part, provided at an upper end of the cylinder head on a side on which a timing chain is disposed, for guiding, to an inner side of a peripheral wall of the cylinder head, oil leaking from a camshaft-supporting concave bearing closest to the timing chain in the cam housing;
- and
- said oil recovery part comprises a projecting part formed on the peripheral wall of the cylinder head that protrudes from an outer side of the peripheral wall, and a groove formed on the projecting part, said groove having an upper face that faces a lower surface of the concave bearing.
An engine, comprising:
- a cylinder head;
- a cam housing, separate from the cylinder head and mounted on the cylinder head;
- an intake camshaft and exhaust camshaft that are supported rotatably by the cam housing;
- a hydraulically-driven variable valve timing mechanism which has a controller constituted by a vane actuator installed at a front end of at least one of the intake camshaft and the exhaust camshaft, and an oil control valve for adjusting supply/recovery of working oil with respect to the controller, and which is capable of changing a timing of opening and closing at least one of an intake valve and an exhaust valve by advancing or retarding a rotational phase of at least one of the intake camshaft and exhaust camshaft in relation to a rotational phase of a crankshaft;
- a forefront-end side journal part of the camshaft, which is provided with a part of an oil passage connecting the controller to the oil control valve;
- a concave bearing provided at a forefront end of the cam housing which supports the camshaft;
- and
- an oil recovery part formed in a front wall upper end of the cylinder head on a side on which a timing chain is disposed, that guides, to an inner side of a peripheral wall of the cylinder head, oil leaking from a sliding contact surface between the forefront-end side journal part of the camshaft and the concave bearing closest to the timing chain in the cam housing,
- said oil recovery part comprising a projecting part protruding from an outer side of the peripheral wall, and a groove formed on the projecting part, said groove having an upper face that faces a lower surface of the concave bearing.
6 more elements
Dependencies are inferred from the claim text.