JP3036265B2 - Outboard motor oil cap mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil cap mounting structure for an outboard motor, and more particularly to an oil cap mounting structure for an outboard motor that can easily inject oil.

[0002]

2. Description of the Related Art In an outboard motor having a four-cycle engine, oil is supplied to each part of the engine, and each part is lubricated. The engine oil is injected from an injection port by removing an oil cap attached to a cylinder head cover forming a cam chamber, and is stored in an oil pan.

[0003] A breather plate is attached to the cylinder head cover on the cam chamber side.
A breather chamber for separating oil is formed.

[0004] Such an oil oil passage structure of an outboard motor is disclosed, for example, in Japanese Patent Laid-Open No. Hei 4-91311. In the engine described in this publication, in an engine having a horizontal cylinder, an opening of a lubricating oil return passage is formed in a cylinder head portion and a cylinder head cover portion facing the bottom of a valve mechanism chamber, respectively. The lubricating oil is returned to the oil pan from the opening of the cylinder head cover portion facing the bottom of the valve mechanism chamber even in the state of being inclined downward.

[0005]

However, conventionally, since the oil inlet is located at a relatively high position and the diameter of the inlet is small, it is difficult to inject the oil, and the oil is spilled when the oil is injected. There was a case. If oil spills in this way, not only appearance problems, but also oil adheres to components such as timing belts and electrical components, causing a problem of adversely affecting engine reliability.

[0006]

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned disadvantages, the present invention forms a breather chamber by a breather plate in a cylinder head cover of an engine, and forms an engine cover and an under cover which cover the engine. In the outboard motor oil cap mounting structure provided with an oil cap on the cylinder head cover,
The oil cap may be provided on the cylinder head cover below the breather chamber and above an upper end surface of the under cover.

[0007]

According to the structure of the present invention, the oil cap is provided on the cylinder head cover below the breather chamber and above the upper end surface of the under cover.
Oil injection becomes easy, and even if oil spills, it is difficult for oil to be applied to other parts, and the reliability of the engine is not affected.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. 1 to 7 show an embodiment of the present invention. 2 to 4, reference numeral 2 denotes a fuel injection type outboard motor. The outboard motor 2 includes a water-cooled four-cycle engine 4, a drive shaft 6 connected to the engine 4, and a propeller 10 connected to the drive shaft 6 via a gear mechanism 8.

The engine 4 is covered by a removable engine cover 12 and an under cover 14 for supporting the engine cover 12 at a lower portion.

The drive shaft 6 is covered by a drive shaft housing 16.

The gear mechanism 8 is covered by a gear case 18.

The engine 4 includes a cylinder block 20
And a cylinder head 22. The cylinder head 22 is fastened to the cylinder block 20 by a fastening bolt (not shown), and is fastened from the drive shaft housing 16 side via the engine holder 24.

The cylinder block 20 supports a crankshaft 26, and is provided with four cylinders 28 in parallel. One end of each connecting rod 30 is connected to the crankshaft 20 corresponding to each cylinder 28. The other end of each connecting rod 30 is connected to each piston 32 slidably provided in each cylinder 28. A crank pulley 34 is attached to the upper end of the crankshaft 26 as shown in FIG.

A camshaft 36 is provided on the cylinder head 22.
Is supported. A cam pulley 38 is attached to the upper end of the cam shaft 36 in correspondence with the crank pulley 34. The cam pulley 38 and the crank pulley 3
4, a timing belt 40 is wound around as shown in FIG.

One end of the drive shaft 6 is connected to the lower end of the crankshaft 26.

The other end of the drive shaft 6 is connected to the gear mechanism 8. The propeller 10 is connected to the gear mechanism 8.

As shown in FIG. 5, the cylinder head 22 has an intake port 44 and an exhaust port 46 which open to each combustion chamber 42 formed in each cylinder 26. Each intake port 44 communicates with each intake passage 52 formed in each intake branch pipe 50 of the intake manifold 48 attached to the cylinder head 22. Each exhaust port 46 has an exhaust passage 56 formed by an exhaust passage wall 54.
Is communicated. As shown in FIGS. 5 and 6, each intake branch pipe 50 of the intake manifold 48 is provided with a cylinder block 2.
0 are arranged along the side surface. Further, each of the exhaust passages 56 is communicated with an exhaust collecting part 58.

Each of the combustion chambers 4 is provided with the cylinder head 22.
2, each ignition plug 60, each intake valve 62 for opening and closing each intake port 44, and each exhaust valve 64 for opening and closing each exhaust port 46 are provided.

Each fuel injection valve 66 is attached to each intake branch pipe 50 of the intake manifold 48 so as to face each intake port 44.

On the upstream side of the intake manifold 48, a surge tank 68 for distributing intake air is provided.

As shown in FIG. 5, a throttle body 72 having a throttle valve 70 is attached to the surge tank 68.

On the upstream side of the throttle body 72,
A throttle guide 74 is attached. The throttle cover 74 has an engine cover 1 on the rear side of the outboard motor 2.
The air taken in from the air inlet 76 formed in 2 flows in as intake air.

FIG. 4 shows the cylinder head 22.
As shown in FIG. 7, a cylinder head cover 80 forming the cam chamber 78 is attached. A depression is formed in the cylinder head cover 80 by the step 80a, and a breather chamber 84 is formed in the depression by attaching the breather plate 82. This breather room 84
Is located above the upper end surface 14a of the under cover 14, that is, the mating surface of the under cover 14 and the engine cover 12, is vertically long, and is provided to sufficiently form a labyrinth passage.

As shown in FIGS. 1, 4, 6, and 7, an oil cap 86 is attached to the cylinder head cover 80 above the upper end surface 14a of the under cover 14 and below the breather chamber 84. The oil cap 86 opens and closes an inlet (not shown).
It is removed when oil is injected.

As shown in FIG. 4, the oil injected from the injection port is guided into an oil pan 90 from an oil flow passage 88 and an oil passage (not shown) formed in the engine holder 24. The oil pan 90 is provided in the drive shaft housing 16.

The oil in the oil pan 90 is supplied to each part of the engine 4 through an oil strainer 94 and an oil pipe 96 by driving an oil pump 92 provided at one end of the drive shaft 6.

The outboard motor 2 is mounted on a hull (not shown) via a mounting bracket 98, and the outboard motor 2 is tilted so that the rear surface thereof, that is, the cylinder head 22 side is located upward with respect to the tilt shaft 100 (tilted). Up) (see FIG. 4).

Next, the operation of this embodiment will be described.

Since the oil cap 86 is located above the upper end surface 14a of the under cover 14, the oil cap 86 is exposed when the engine cover 12 is removed, so that the oil cap 86 can be easily attached and detached. Can be.

In order to improve oil separation performance,
Since the oil cap 86 is not attached to the breather chamber 84 occupying a large area of the cylinder head cover 80,
Oil is not injected into the labyrinth, so that oil can be easily injected.

Further, in this embodiment, even a relatively large outboard motor can be largely tilted (tilted up) about the tilt shaft 100 (shown in the direction of the arrow in FIG. 4). . Therefore, by tilting up at the time of oil injection, the cylinder head 22 side, which is the rear surface of the engine 4, is positioned substantially on a horizontal plane, and oil injection can be further facilitated.

Furthermore, the oil cap 86 can be positioned sufficiently away from the timing belt 40 and the electrical components, etc., which spill oil, so that even if oil is spilled to the surroundings at the time of oil injection, the oil is injected into the engine 4. Has no effect.

[0033]

As is apparent from the above detailed description, according to the present invention, the oil cap is disposed on the cylinder head cover below the breather chamber and above the upper end surface of the under cover. Oil can be easily injected, and even if oil is spilled, it is difficult for oil to be applied to other parts, thereby preventing the reliability of the engine from being affected.

[Brief description of the drawings]

FIG. 1 is a rear view of an engine of an outboard motor indicated by an arrow の in FIG.

FIG. 2 is a side view of the outboard motor.

FIG. 3 is a rear view of the outboard motor indicated by an arrow 〓 in FIG. 2;

FIG. 4 is a sectional view of the outboard motor taken along the line II-II of FIG.

FIG. 5 is a sectional view of the outboard motor taken along line II-II of FIG.

FIG. 6 is a schematic side view of an engine of the outboard motor.

FIG. 7 is an enlarged side view of the engine of the outboard motor.

[Explanation of symbols]

 2 Outboard motor 4 Engine 6 Drive shaft 8 Gear mechanism 10 Propeller 12 Engine cover 14 Under cover 20 Cylinder block 22 Cylinder head 40 Timing belt 80 Cylinder head cover 82 Breather plate 84 Breather chamber 86 Oil cap

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Nobuyuki Shomura 300, Takatsukacho, Hamamatsu-shi, Shizuoka Suzuki Co., Ltd. (72) Inventor Hidehiko Yoshioka 300, Takatsukacho, Hamamatsu-shi, Shizuoka Suzuki Co., Ltd. (72 ) Inventor Jiro Saiga 300 Takatsuka-cho, Hamamatsu-shi, Shizuoka Suzuki Co., Ltd. (56) References JP-A-4-91311 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) F01M 11/04 B63H 20/00

Claims (1)

(57) [Claims] 1. An outboard motor oil cap mounting structure in which a breather chamber is formed by a breather plate in a cylinder head cover of an engine, an engine cover and an under cover for covering the engine are provided, and an oil cap is provided on the cylinder head cover. An oil cap mounting structure for an outboard motor, wherein the oil cap is provided below the breather chamber and above an upper end surface of the under cover on the cylinder head cover.