Internal combustion engine
AssigneeHonda Motor Co., Ltd.
InventorNozomi Okada
Life of this patent
Estimating the term…
Abstract
An internal combustion engine optimizing small-size arrangement of the valve drive mechanism, considering that the exhaust valve diameter is smaller than the intake valve diameter. Intake and exhaust valves are in a radial arrangement, intake and exhaust cam surfaces are inclined relative to intake and exhaust cam axes, intake and exhaust rocker arm support members are inclined correspondingly in the same way and disposed between an intake camshaft and an exhaust camshaft. Pivotal support base portions of intake rocker arms and pivotal support base portions of exhaust rocker arms are disposed such that the distances thereof from a joining surface joining a cylinder head and a cylinder body are different.
Claims6
An internal combustion engine, comprising:
- a cylinder body having a cylinder bore with a cylinder axis;
- a cylinder head joined to the cylinder body on a joining surface;
- a pair of intake valves and a pair of exhaust valves;
- an intake camshaft having intake cams for pressing the intake valves, respectively;
- an exhaust camshaft having exhaust cams for pressing the exhaust valves, respectively;
- intake rocker arms interposed between the intake cams and the intake valves, respectively;
- exhaust rocker arms interposed between the exhaust cams and the exhaust valves, respectively;
- intake rocker arm support members for pivotably supporting pivotal support base portions of the intake rocker arms, respectively;
- and
- exhaust rocker arm support members for pivotably supporting pivotal support base portions of the exhaust rocker arms, respectively:
- wherein the intake valves and the exhaust valves are disposed in radial directions with respect to the cylinder axis;
- the intake cams include intake cam surfaces inclined at inclination angles relative to an axis of the intake camshaft, respectively;
- the intake rocker arm support members are disposed to incline at inclination angles corresponding to the inclination angle of the intake cam surfaces, respectively;
- the exhaust cams include exhaust cam surfaces inclined at inclination angles relative to an axis of the exhaust camshaft, respectively;
- the exhaust rocker arm support members are disposed to incline at inclination angles corresponding to the inclination angle of the exhaust cam surfaces, respectively;
- the intake rocker arm support members and the exhaust rocker arm support members are disposed between the intake camshaft and the exhaust camshaft as viewed along the cylinder axis;
- and
- the pivotal support base portions of the intake rocker arms and the pivotal support base portions of the exhaust rocker arms are disposed such that distances from the joining surface to the intake rocker arm support members and to the exhaust rocker arm support members are different.
Dependencies are inferred from the claim text.