US 6,647,935 B2Granted

Reciprocating internal combustion engine

AssigneeNissan Motor Co., Ltd.

InventorsShunichi Aoyama, Katsuya Moteki, Kenshi Ushijima, Ryosuke Hiyoshi

Life of this patent

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Abstract

In a rockable-cam equipped reciprocating internal combustion engine, a rockable cam is rotatably fitted on the outer periphery of an intake-valve drive shaft that is rotatable in synchronism with rotation of a crankshaft. The rockable cam oscillates within predetermined limits during rotation of the intake-valve drive shaft so as to directly push an intake-valve lifter. As viewed from an axial direction of the crankshaft, an axis of the intake-valve drive shaft is offset from a centerline of the intake-valve stem in a first direction that is normal to both the cylinder centerline and the crankshaft axis and directed from the cylinder centerline to the intake valve side. The crankshaft axis is also offset from the cylinder centerline in the first direction.

Claims10

Dependent claims

A reciprocating internal combustion engine comprising:

a cylinder block having a cylinder;
a piston movable through a stroke in the cylinder;
an intake valve;
an intake-valve lifter on a stem of the intake valve;
an intake-valve drive shaft that rotates about its axis in synchronism with rotation of a crankshaft;
a rockable cam that is rotatably fitted on an outer periphery of the intake-valve drive shaft, and that oscillates within predetermined limits during rotation of the intake-valve drive shaft so as to directly push the intake-valve lifter;
and
as viewed from an axial direction of the crankshaft, an axis of the intake-valve drive shaft being offset from a centerline of the intake-valve stem in a first direction that is normal to both a centerline of the cylinder and an axis of the crankshaft and directed from the cylinder centerline to an intake valve side, and the crankshaft axis being offset from the cylinder centerline in the first direction.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/170,683Filed 14 Jun 2002
Priority: JP 2001-22451925 Jul 2001
Published: US 2003/0019448 A130 Jan 2003
Granted: 18 Nov 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

F02F 7/0019
Cylinder arrangements: cylinders and crankshaft not in one plane
F01L 1/024
Valve drive: belt drive
F01L 1/34
Valve-gear or valve arrangements, e.g. lift-valve gear: characterised by the provision of means for changing the timing of the valves without…
F01L 13/0021
For optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque: by…