US 2010/0065011 A1Published application

Four-cycle air-oil cooled engine, and vehicle incorporating same

AssigneeHonda Motor Co., Ltd.

InventorHiroyuki Sugiura

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Abstract

A four-cycle air-oil cooled engine includes a cylinder head having a spark plug mounting hole formed therein, and a ring-like groove formed therein and surrounding the spark plug mounting hole. The cylinder head is formed with first and second co-planar sealing surfaces, disposed on a plane perpendicular to an axis of the spark plug mounting hole, and having an opening end of the ring-like groove disposed therebetween. The ring-like groove defines an oil jacket around the periphery of the spark plug mounting hole. A cover member having a flat surface opposed to the first and second flat sealing surfaces of the cylinder head is secured to the cylinder head such that a single gasket is interposed between the first and second sealing surfaces and the flat surface of the cover member.

Claims20

Dependent claims

A four-cycle air-oil cooled engine, comprising:

a cylinder head having a spark plug mounting hole formed therein and a groove formed therein surrounding a portion of the spark plug mounting hole;
said spark plug mounting hole adapted to receive a tip portion of a spark plug therein;
a cover member operatively attached to said cylinder head and surrounding a portion of said spark plug mounting hole and arranged to cover an opening end of the groove, thereby defining an oil jacket around a periphery of the spark plug mounting hole;
and
a gasket disposed between said cylinder head and said cover member;
wherein the cylinder head is formed with first and second co-planar sealing surfaces which are disposed along a plane perpendicular to an axis of the spark plug mounting hole, wherein an opening end of the groove is disposed between the first flat sealing surface and the second flat sealing surface;
and
wherein said cover member, having a flat surface opposed to the first and second sealing surfaces, is secured to the cylinder head such that said gasket is interposed between the first and second sealing surfaces and the flat surface of the cover member.

5 more elements

An air-oil cooled engine, comprising

a cylinder head having a spark plug mounting hole and a groove surrounding a portion of the spark plug mounting hole formed therein;
said spark plug mounting hole adapted to receive a spark plug therein;
a cover member secured with said cylinder head surrounding a portion of said spark plug mounting hole such that an opening end of the groove is closed, thereby defining an oil jacket around a periphery of the spark plug mounting hole;
a gasket disposed between said cylinder head and said cover member;
said gasket being formed of material comprising one or more metals;
an air-guide plate formed integrally continuous with said gasket, and extending upwardly of said spark plug towards a front side of the vehicle;
said air-guide plate adapted to divert running-air to the periphery of the spark plug during operation of a vehicle;
wherein the cylinder head is formed with a pair of flat sealing surfaces having a plane perpendicular to an axis of the spark plug mounting hole;
wherein an opening end of the groove is formed between the pair of flat sealing surfaces;
and
wherein said cover member having a flat surface opposed to the pair of flat sealing surfaces is secured to the cylinder head such that said gasket is interposed between the pair of flat sealing surfaces and the flat surface of the cover member.

8 more elements

Dependencies are inferred from the claim text.