US 6,142,129 AGranted

Breather apparatus for engine

AssigneeHonda Giken Kogyo Kabushiki Kaisha

InventorsYoshiaki Hori, Tohru Nishi

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Abstract

To provide a breather apparatus for a horizontally-opposed type or a V-type engine in which first and second cylinder blocks having first and second cylinder bores are commonly connected to a crank case in such a manner that the axial line of the first cylinder bore is offset from the axial line of the second cylinder bore to one side of the crank shaft along the axial line of the crank shaft. A cam chain chamber is provided in the crank case, the cylinder blocks and the cylinder heads on one side of the crank shaft along the axial line of the crank shaft. Furthermore, a breather chamber is formed in the second cylinder block, the second cylinder head, and the crank case at a position between the cam chain chamber and the second cylinder bore. The breather chamber has a relatively large capacity, while enlargement of the engine is avoided.

Claims12

Dependent claims

An engine comprising:

first and second cylinder blocks having first and second cylinder bores extending therethrough in directions opposed to each other at 180.degree. with respect to each other, said first and second cylinder blocks being commonly connected to a crank case in such a manner that an axial line of said first cylinder bore is offset from an axial line of said second cylinder bore toward one end of said crank shaft along the axial line of said crank shaft;
first and second cylinder heads forming combustion chambers between said first and second cylinder heads and pistons slidably fitted in said cylinder bores are connected to said first and second cylinder blocks, respectively;
a cam chain chamber provided in said crank case, said cylinder blocks and said cylinder heads on said one end of said crank shaft along the axial line of said crank shaft;
and
first and second cam chains for reducing rotational power of said crank shaft into half and transmitting the reduced rotational power to ends of first and second cam shafts linked to intake valves and exhaust valves for taking air in said combustion chambers and discharging the exhaust gas from said combustion chambers, respectively, said first and second cam chains being contained in said cam chain chamber;
and
a breather chamber provided in said second cylinder block, said second cylinder head and said crank case at a position between said cam chain chamber and said second cylinder bore.

4 more elements

A breather apparatus for an engine, said engine including:

first and second cylinder blocks having first and second cylinder bores extending therethrough in directions opposed to each other at 180.degree. with respect to each other, the first and second cylinder blocks being commonly connected to a crank case in such a manner that an axial line of the first cylinder bore is offset from an axial line of the second cylinder bore toward one end of the crank shaft along the axial line of the crank shaft;
first and second cylinder heads forming combustion chambers between the first and second cylinder heads and pistons slidably fitted in the cylinder bores are connected to the first and second cylinder blocks, respectively;
a cam chain chamber provided in the crank case, the cylinder blocks and the cylinder heads on the one end of the crank shaft along the axial line of the crank shaft;
and
first and second cam chains for reducing rotational power of the crank shaft into half and transmitting the reduced rotational power to ends of first and second cam shafts linked to intake valves and exhaust valves for taking air in the combustion chambers and discharging the exhaust gas from the combustion chambers, respectively, the first and second cam chains being contained in the cam chain chamber,
said breather apparatus comprising:
a breather chamber provided in the second cylinder block, the second cylinder head and the crank case at a position between the cam chain chamber and the second cylinder bore.

4 more elements

A breather apparatus for an engine, the engine including:

first and second cylinder blocks having first and second cylinder bores extending therethrough in directions opposed to each other at 180.degree. with respect to each other;
first and second cylinder heads forming combustion chambers between the first and second cylinder heads and pistons slidably fitted in the cylinder bores;
a cam chain chamber provided in the crank case, the cylinder blocks and the cylinder heads on one end of the crank shaft along the axial line of the crank shaft;
and first and second cam chains, said breather apparatus comprising a breather chamber provided in the second cylinder block, the second cylinder head and the crank case at a position between the cam chain chamber and the second cylinder bore.

1 more element

Dependencies are inferred from the claim text.