US 11,384,711 B2Granted

Engine

AssigneeHonda Motor Co., Ltd.

InventorsSoji Kashima, Toshiro Kiura, Kota Tokubi

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Abstract

An engine (E) includes a crankcase body (19), a crankcase cover (20) covering a case opening portion (19b) of the crankcase body (19), a crankshaft (2), a cylinder base portion 21a located inside the crankcase body (19), a cylinder block (21b) located outside the crankcase body (19). The crankcase cover (20) is detachably attached to an upper portion of the crankcase body (19).

Claims5

Dependent claims

An engine comprising:

a crankcase body including a bottom portion including a first crankshaft insertion hole and a tubular portion including the bottom portion integrally formed at one end in a first direction and including a case opening portion at the other end in the first direction;
a crankcase cover including a second crankshaft insertion hole and covering the case opening portion of the crankcase body;
a crankshaft inserted through the first crankshaft insertion hole and the second crankshaft insertion hole;
a cylinder base portion located inside the crankcase body;
and a cylinder block located outside the crankcase body, wherein:
the first direction is an axial direction of the crankshaft which is an up-down direction of the engine;
the crankcase cover is detachably attached to an upper portion of the crankcase body;
a camshaft is installed inside the crankcase body;
the camshaft is arranged further on a lower side than the cylinder base portion in the axial direction of the crankshaft, and a shaft portion of the camshaft is arranged between an outer side of the cylinder base portion and an inner side of the crankcase body;
the crankshaft is rotatably supported between a first bearing provided adjacent to the first crankshaft insertion hole of the bottom portion of the crankcase body and a second bearing provided adjacent to the second crankshaft insertion hole of the crankcase cover;
the shaft portion of the camshaft, rotatably supporting the camshaft, extends in the first direction, one end of the shaft portion is supported by the bottom portion of the crankcase body, and the other end of the shaft portion is disposed just below an outer wall of the cylinder base portion;
and
the camshaft is provided with a gear portion rotatably driven by meshing with a timing gear fixed to the crankshaft, and in a top view in which the crankcase cover is removed, a part of the gear portion is exposed from the cylinder base portion, and a remaining part of the gear portion is covered with the cylinder base portion.

10 more elements

Dependencies are inferred from the claim text.

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Abstract

An engine comprising:

a crankcase body including a bottom portion including a first crankshaft insertion hole and a tubular portion including the bottom portion integrally formed at one end in a first direction and including a case opening portion at the other end in the first direction;
a crankcase cover including a second crankshaft insertion hole and covering the case opening portion of the crankcase body;
a crankshaft inserted through the first crankshaft insertion hole and the second crankshaft insertion hole;
a cylinder base portion located inside the crankcase body;
and a cylinder block located outside the crankcase body, wherein:
the first direction is an axial direction of the crankshaft which is an up-down direction of the engine;
the crankcase cover is detachably attached to an upper portion of the crankcase body;
a camshaft is installed inside the crankcase body;
the camshaft is arranged further on a lower side than the cylinder base portion in the axial direction of the crankshaft, and a shaft portion of the camshaft is arranged between an outer side of the cylinder base portion and an inner side of the crankcase body;
the crankshaft is rotatably supported between a first bearing provided adjacent to the first crankshaft insertion hole of the bottom portion of the crankcase body and a second bearing provided adjacent to the second crankshaft insertion hole of the crankcase cover;
the shaft portion of the camshaft, rotatably supporting the camshaft, extends in the first direction, one end of the shaft portion is supported by the bottom portion of the crankcase body, and the other end of the shaft portion is disposed just below an outer wall of the cylinder base portion;
and
the camshaft is provided with a gear portion rotatably driven by meshing with a timing gear fixed to the crankshaft, and in a top view in which the crankcase cover is removed, a part of the gear portion is exposed from the cylinder base portion, and a remaining part of the gear portion is covered with the cylinder base portion.

10 more elements