Ships – Motorized self-propelled waterski or waterscooter-type vehicle – Having rider straddling seat
Reexamination Certificate
2000-11-17
2002-03-19
Swinehart, Ed (Department: 3617)
Ships
Motorized self-propelled waterski or waterscooter-type vehicle
Having rider straddling seat
C440S08800J
Reexamination Certificate
active
06357372
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a saddle type small-sized boat wherein a four-cycle engine having a head cover is carried in a boat body. More particularly, the present invention relates to the head cover and a cylinder head of the four-cycle engine of the saddle type small-sized boat.
2. Description of Background Art
Conventionally, a small-sized boat as shown in FIGS.
9
(
a
) and
9
(
b
) is known as a saddle type small-sized boat wherein a four-cycle engine having a head cover is carried in a boat body (Japanese Patent Laid-Open NO. Hei. 10 252440).
FIGS.
9
(
a
) and
9
(
b
) are front elevational sectional views of the boat. FIG.
9
(
a
) shows the boat in an ordinary state and
9
(
b
) shows the boat in a capsized state. The surface of the water is designated by the letter H.
As shown in FIG.
9
(
a
), the boat
1
includes a four-cycle engine
3
carried in a boat body
2
and further includes a jet pump not shown which is driven by the four-cycle engine
3
.
A breather exit
4
a
is provided in a head cover
4
of the engine
3
and is connected to an intake apparatus
6
by a breather pipe
5
.
Accordingly, with the engine
3
having such a construction as just described, blowby gas leaking out into the head cover
4
is allowed to flow back and be burnt.
Further, a hole (not shown) through which a plug (ignition plug) is to be mounted and dismounted is formed in the head cover
4
, and a bearing surface (not shown) for a plug is formed on a cylinder head.
Since a saddle type small-sized boat of the type described is used principally for leisure, it is capsized frequently, and water sometimes enters the boat body.
In such a situation as just described, the conventional saddle type small-sized boat as illustrated in FIGS.
9
(
a
) and
9
(
b
) and as described above has the following problems.
If the boat
1
is capsized as shown in (
b
) of
FIG. 9
, then oil in the engine
3
flows downwardly (toward the head cover
4
). However, the oil cannot be stored sufficiently by the conventional head cover
4
, and there is the possibility that the oil may flow from the breather exit
4
a
through the breather pipe
5
into the intake apparatus
6
, resulting in contamination of the intake apparatus
6
with the oil. Further, if the oil flows out from the intake apparatus
6
, then there is the possibility that the inside of the boat body
2
may also be contaminated with the oil.
With the conventional saddle type small-sized boat as illustrated in FIGS.
9
(
a
) and
9
(
b
), if water entering the boat body splashes on the head cover
4
, then the water stays in the plug mounting-dismounting hole and sometimes causes trouble with an electric apparatus.
Particularly when the saddle type small-sized boat is turned back as shown in FIG.
9
(
a
) by a user after it is capsized as shown in FIG.
9
(
b
), water splashes by a large amount on the head cover
4
, and the water is liable to stay in the plug mounting-dismounting hole and cause trouble with the electric apparatus.
SUMMARY AND OBJECTS OF THE INVENTION
It is a first object of the present invention to solve the problems described above and provide a saddle type small-sized boat wherein an intake apparatus and the inside of a boat body is less likely to be contaminated with oil.
It is a second object of the present invention to solve the problems described above and provide a saddle type small-sized boat which is less likely to suffer from causing trouble to an electric apparatus.
To attain the first object of the present invention, a saddle type small-sized boat is provided wherein a four-cycle engine having a head cover in which a breather exit is formed is carried in a boat body and the head over forms an oil storage portion when the boat is capsized. The oil storage portion is configured such that an upper face of the head cover is positioned close to a ceiling of the boat body and extends along the ceiling. In addition, the breather exit is provided above an upper face of any oil that is stored in the head cover when the boat is capsized.
A saddle type small-sized boat of the present invention is directed to a four-cycle engine having a head cover in which a breather exit is connected to an intake apparatus by a breather pipe, and a connection portion of the breather pipe to the intake apparatus is positioned below the breather exit.
A saddle type small-sized boat according to the present invention provides a breather exit on an upstream side with respect to a turning direction when the boat is turned back after capsized.
A saddle type small-sized boat according to the present invention provides a four-cycle engine having a head cover in which a plug mounting-dismounting hole is formed and the head cover has a water drain path formed therein which connects to the plug mounting-dismounting hole and is opened to a peripheral face of the head cover rearwardly of the hole with respect to an advancing direction of the boat body.
A saddle type small-sized boat according to the present invention is provided wherein the four-cycle engine is a DOHC engine having intake and exhaust camshafts independent of each other, and the water drain path of the head cover extends in the rear of a cam cover portion of the head cover which covers cam portions of the camshafts with respect to the advancing direction of the boat body and is opened to a peripheral face of the head cover.
A saddle type small-sized boat according to the present invention is provided wherein an upper face of a cylinder head of the engine is inclined as viewed from the front of the boat body, and the water drain path is opened downwardly in a direction of the inclination.
A saddle type small-sized boat according to the present invention is provided wherein the water drain path is opened to a downstream side of the plug mounting-dismounting hole with respect to a turning direction when the boat body is turned back after capsized.
A saddle type small-sized boat according to the present invention is provided with an engine having a plug mounting-dismounting hole and a plug bearing surface which are inclined as viewed from the front of a boat body and includes a water drain flow path that is formed at lowermost end portions of the plug mounting-dismounting hole and the plug bearing surface.
A saddle type small-sized boat according to the present invention is provided with water drain flow path on the downstream side of the plug mounting-dismounting hole and the plug bearing surface with respect to a turning direction when the boat is turned back after the boat has capsized.
It is to be noted that the turning direction when the boat is turned back after the boat has capsized is indicated in a user's manual, on the boat body and so forth.
A saddle type small-sized boat provides a head cover for a four-cycle engine with a breather exit formed in the boat body. An oil storage portion is provided when the boat is capsized wherein oil flowing downwardly (toward the head cover) when the boat is capsized is stored by the head cover.
Since the upper face of the head cover is positioned close to the ceiling of the boat body and extends along the ceiling, the containing capacity of the head cover can be increased, and the stored amount of the oil by the head cover is assured sufficiently.
Further, since the breather exit described above is provided above the upper face of the oil stored in the head cover when the boat is capsized, such a situation wherein the oil flows out through the breather exit is less likely to occur.
Accordingly, with the saddle type small-sized boat a situation where the oil flows out from the head cover when the saddle type small-sized boat is capsized is less likely to occur. As a result, an advantage occurs in that an intake apparatus and the inside of the boat body are less likely to be contaminated with the oil. In addition, since the containing capacity of the head cover can be increased, the breathing performance is augmented.
In other words, with the saddle type small-sized boat according to the
Gokan Yoshitsugu
Yokotani Hitoshi
Honda Giken Kogyo Kabushiki Kaisha
Swinehart Ed
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