JPS60104493A - Outboard engine - Google Patents

Abstract

PURPOSE:To facilitate the installation and removal of the top cowling of an outboard engine, by positioning the open and close split surfaces of the cowling at a level in the vicinity of the top of a cylinder so that an ignition plug and a carburettor confront the cowling in the vicinity of the open and close split surfaces of the cowling. CONSTITUTION:A top cowling 56 is formed in a shallow-bottomed cover-like shape, for closing the top opening of an upper casing 14 as a bottle cowling. The open and close split surfaces 58 of these top cowling 56 and upper casing 14 are positioned in the vicinity of the top of a cylinder 18, crossing a cylinder head 24, and therefore, the top of an engine 12 and a carburettor 32 confront upward through the split surfaces 58. The rear edge of the top cowling 56 is attached to the upper casing 14 colsably upward by means of a hinge joint 60, and the front edge thereof may be locked in its closed position by means of a latch 62.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an outboard motor in which the engine is covered with a top cowling and a bottom cowling.

(Prior Art) Engine maintenance 2 is sometimes performed with the outboard motor in a state where its propeller side is lowered, that is, in a tilt-down state. In many conventional outboard motors, the crank + III + f 1 + 7 were directly connected, so in multi-cylinder engines in particular, the spark plugs and carburetors of each cylinder were located over a fairly wide area downwards. . For this reason, the opening/closing surfaces of the top cowling and bottom cowling that cover the engine are also located near the bottom of the engine.

When I removed the top cowling, I had to make sure that the spark plug, carburetor, etc. were exposed on the side of the engine. In other words, the top cowling had to be formed into a deep, inverted cylindrical shape. As a result, the top cowling has a structure in which the entire top cowling is lifted upward to be attached or detached, and this poses a problem in that attachment and detachment work is extremely difficult, especially in the case of large outboard motors.

Therefore, it is possible to make a part of the cowling openable in any direction, but in this case, the n-curve m1 of the opening/closing lid is pressed against the mouth edge of the cowling 17M from the side to seal, so the white body of the opening/closing lid lacks rigidity. There are concerns about the sealability due to such reasons. Furthermore, in order to secure the opening/closing lid, a frame must be provided to surround the engine.

In the case of type 1 engines, where this frame does not pass close to the spark plug f''2, there is also the problem that in the case of normal in-line engines, this frame becomes a major hindrance to engine maintenance.

Furthermore, in conventional outboard motors, the opening/closing surface of the top cowling is located at a low position, so it is easy to get splashed with water.

There were also concerns about waterproofness.

(J characteristic of the invention) The present invention was made in view of such small end O.
A boat that allows maintenance of spark plugs, carburetor, etc. from the lower side of the engine, has a shallow shape at the bottom of the two top cowlings, makes it easier to attach and detach the l-tube cowling, and is designed to be waterproof. The objective is to provide an external engine.

(Structure of the Invention) To achieve this object, the present invention provides an outboard motor in which an engine is covered with a top cowling and a bottom cowling, and the rotation of the engine is transmitted to a propeller shaft via a substantially vertical drive shaft. It is equipped with a horizontal rank axis and cylinders standing upwardly, and a spark plug and a carburetor are installed at a height near the top f of the cylinders. The opening/closing section is constructed so as to be viewed closely.The present invention will be described below in detail based on the embodiments shown in the drawings.

(Embodiment) Fig. 1 is a side i1+i view of a second embodiment of the present invention, partially cut away, and Fig. 2 is a TI-TI cross-sectional view of the engine. In FIG. 1, the reference numeral 10 is a propulsion unit, which is an IU row two-cylinder water-cooled four-cycle engine 12. This corn gin]2
Bottom cowling that covers the sides of; 1fr, sticky upper casing 14. Lower casing 16th grade? We are prepared.

The engine 12 includes a cylinder 18 that stands upwardly and is slightly tilted backwards, and a crank 4η1122 is held horizontally between the cylinder 18 and the crankcase 20 below. A known valve operating mechanism that opens and closes the intake and exhaust valves using a single nicum 1lql+ 26 is accommodated in the cylinder head 24, which is taken from the cylinder 18.

In FIG. 2, 28 is a tooth (=J belt) that transmits the rotation of the crankshaft 22 to the camshaft 2G, and 30 is a tooth belt that transmits the rotation of the crankshaft 22 to the camshaft 2G.
In addition, in Fig. 1, 32 is a carburetor installed at the front of the cylinder head 24, and 34 is a tracheal pipe connected to the rear of the cylinder head. It is guided downward through the propulsion unit 1-0 by the exhaust pipe 34 and is discharged into the water from the boss portion of the propulsion propeller 3G.

Reference numeral 40 denotes an intermediate hit supported by the crankcase 20 so as to be located below the crankshaft 22, and this intermediate hit
11140 has crank 1Ill122 turn E as gear 4
It is conveyed by 2°44. A connection 11q1+ 46 is supported vertically through the bottom wall of the crankcase 20, and the rotation of the intermediate 11q1+ 40 is transmitted to this connection shaft 46 by a bevel gear 48 immersed in lubricating oil in the crank case 20. It will be done. This connection shaft 46 is formed with spline internal teeth opening downward, and the drive rl is substantially perpendicular to the spline inner teeth.
qli 5o's 10"'t5 are spline-coupled. 52 is a nearly horizontal propeller lli+I+, and the drive +
The rotation of the fi 50 is transmitted to this propeller shaft 52 via a forward/reverse switching float group 54. The propulsion propeller 36 is attached to the propeller shaft 52.

Reference numeral 56 denotes a top cowling, which is formed in the shape of a shallow lid so as to close the J2W1;F1 openings of the packaging 14 serving as the bottom cowling.

The opening/closing surface 58 between the top cowling 56 and the upper casing 14 is close to the top of the cylinder 18.

That is, it is located across the cylinder head 24,
The upper part of the engine 12 and the carburetor 32 face from this split surface 58 on three sides. The rear edge of the top cowling 56 can be opened and closed upward by a hinge 60 to open and close the upper casing 1.
4, and the front edge can be secured in the closed position by a latch 62.

In Figure 1, 64 is the stern plate, 66 is the clamp bracket, 6
Reference numeral 8 designates a swivel bracket which is attached to this clamp bracket 66 and rotated up and down by a tilt shaft 70, and 72 is a steering shaft which is supported by this swivel bracket 68. A mounting arm 7 is attached to the lower end of this steering shaft 72.
4.76 is fixed, and the rear end of the mounting arm 74 is attached to the rubber damper 7.
8 to the rear surface of the cylinder 18, and the handling arm 76
Its rear end is connected to the upper casing 14 via a rubber damper 80°802. 82 is a steering handle fixed to the mounting arm 74.

According to this embodiment, since the cylinder 18 is upright,
Not only the spark plug and carburetor 32 provided in the cylinder head 24 but also the valve mechanism are concentrated in the upper part of the engine 2. Therefore, even if the top cowling 56 has a shallow bottom shape, the maintainability of the engine 12 is not hindered. Furthermore, since the opening/closing split surface 58 is located at a high position, the distance between the water surface and the split surface 58 is also large, making it difficult for water to splash onto the seal portion around the periphery of the split surface 58. This improves waterproofness, and furthermore, floating driftwood hits the top cowling 5G while cruising and breaks the cowling 5G.J1. '5 accidents can also be prevented.

In this embodiment, the intermediate shaft 40 is disposed below the crankshaft 22 and the engine 12 as a whole is elongated, so the area of the opening/closing split surface 58 is small and its peripheral edge is narrow.

FIG. 3 is a side view and a plan view of essential parts of another embodiment. The engine 12A of this embodiment has two cylinders with a preloaded crank chamber.
It is a cycle engine, and the intermediate shaft 40A is the crankshaft 2.
2A, and the carburetor 32A is located in front of the crankcase 2A.
It is attached so as to extend upward from 0A. In addition, the bottom cowling 90 is connected to the top casing 14. It is made separately from A. In FIGS. 3 and 4, parts corresponding to those in FIGS. 1 and 2 are indicated by the reference numeral A, so the description thereof will not be repeated.

In each of the above embodiments, the top cowling is 56°56A.
Since the bottom is shallow, it can be formed by pressing sheet metal, etc. In this case, it has a significantly higher rigidity than when molded from synthetic resin.
The strength can be increased, and the upper surface of the top cowling 56, 56A can also be used as a step on which to place one's feet when boarding or disembarking from a ship.

Also, if it is made of metal, it will have good heat conductivity, so it can improve the heat insulation of the engine room, and by forming a large number of uneven stripes on the top surface, it is possible to improve both rigidity and heat dissipation at the same time. Note that the hinge 60.6OA can be used not only of the normal type in which the top cowling is always connected to the bottom cowling side, but also of the type that can be attached and detached from the bottom cowling when the top cowling is open.

(Effects of the Invention) As described above, the present invention makes the crankshaft of the engine substantially horizontal and the cylinder erected upward.

The spark plug, carburetor, etc. can be concentrated in the upper part of the engine, and since the 1 meter opening/closing side of the top cowling is located close to the top of the cylinder, the l-tube cowling can be shaped with a shallow bottom. This makes it possible to improve the ease of attaching and detaching the top cowling without impairing the maintainability of the engine. In addition, since the opening/closing surface is located high above the water surface, it is difficult for water to splash onto this surface, improving waterproofness.

[Brief explanation of drawings]

Fig. 1 is a partially sectional side view of the present invention, Fig. 2 is a sectional view taken along the line ■-■ showing the engine, and Figs. 3 and 4 are of other embodiments.
(If side view and plan view. 12. 12A...Engine. 14. Upper casing as bottom cowling. 18. 18A Cylinder. 22.22A Crankshaft. 32. 32A Carburetor. 50. 5OA... Drive shaft. 52.52A... Propeller shaft. 56.56A ・Top cowling. 58.58A... Opening/closing split surface. Patent applicant Sanshin Kogyo Co., Ltd. Yamaha Motor Co., Ltd. Agent Patent attorney Yama 1) Sentence K1 Figure 1 Figure 2 Figure 2

Claims (1)

[Scope of Claims] An outboard motor in which an engine is covered with a top cowling and a bottom cowling, and the rotational output of the engine is transmitted to a propeller shaft via a substantially vertical drive shaft. The engine has a substantially horizontal rank axis and a cylinder that stands up in three directions, and the opening/closing split surfaces of both cowlings are located on one side of the cylinder (from near J), and a spark plug and a carburetor are installed. An outboard motor characterized in that a vessel is arranged near the opening/closing surface.