JPS625839B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly comprises an engine extending in the longitudinal direction, and a flywheel magneto connected to the upper part of the crankshaft extending in the vertical direction of the engine and arranged at the upper part of the engine. The present invention relates to an outboard motor in which an engine unit as a member is housed in a cowling, and the rear part of the engine projects rearward from the flywheel magneto.

In this type of outboard motor, when a fuel tank is housed within a cowling, a major problem is how to arrange a large capacity fuel tank in a limited space within the cowling.

The present invention has been made to address these problems, and its main purpose is to accommodate a large capacity fuel tank within the cowling by effectively utilizing the limited space within the cowling. .

Hereinafter, the present invention will be explained based on the drawings. FIG. 1 shows an example of an outboard motor according to the present invention. This outboard motor houses an engine 20a in a cowling 10a, and an engine unit 20 whose main components include a flywheel magneto 20b integrated with a manual starter 20c, and a fuel tank 30 in the cowling 10a. It is accommodated.

The engine 20a is of a vertical crankshaft type, and is arranged in the front-rear direction within the cowling 10a, with the crankshaft 2 extending in the vertical direction.
A base 22 of a flywheel magneto 20b connected to the upper part of the engine 20a is fixed to the upper part of the cylinder body 23 and the crankcase 24 (approximately at the upper center of the engine 20a). Further, a drive shaft 24a is connected to the lower part of the crankshaft 21, and is inserted through a casing 10b attached to the bottom of the cowling 10a. In such an engine unit 20, the engine 2
A cylinder portion 0a projects rearward, and a fuel tank 30 is disposed in a space formed behind the engine unit 20 in the cowling 10a.

As shown in FIGS. 1 to 5, the fuel tank 30 is a space formed by the flywheel magneto 20b in the engine unit 20, the starter 20c, the rear upper part of the cylinder body 23 of the engine 20a, and the cowling 10a. a main tank part 30a that substantially occupies the main tank part 30a;
a rear sub-tank portion 30b protruding downward from the rear bottom of the cylinder head cover 25 and facing the rear side of the cylinder head cover 25;
Side sub-tank part 3 protruding from the right bottom of the main tank part 30a and facing the right side of the rear part of the cylinder body 23
0c.

The main tank portion 30a is provided with a fuel filler port 31 projecting to the outside through an opening 11a provided in the top cowling 11 at the top thereof, and a fuel filler port 31 projecting to the outside through an opening 11a provided in the top cowling 11. A bracket 32 is provided to protrude downward. Further, a bracket 32 is also provided at the bottom of the side sub-tank portion 30c, as shown in FIG. 4, protruding downward. These brackets 32, 32 are provided with cylindrical bracket portions 32a, 32a that extend inwardly, and opening portions 32b, 32b that extend in the axial direction are formed at the lower front side of both cylindrical bracket portions 32a, 32a. has been done. Moreover, these two cylindrical bracket parts 32a,
A damper member 33 made of rubber is fitted to 32a. The damper member 33 is connected to the cylindrical bracket portion 3
2a, and the columnar part 3
A notch 33c is formed on the inner side of the bracket 3a and extends from the center through the opening 32b of the cylindrical bracket 32a to the outer periphery. On the other hand, as shown in FIGS. 1 and 5, a bracket 34 is provided at the bottom of the rear sub-tank portion 30b and has mounting portions 34a, 34a projecting downward on both left and right sides.

The fuel tank 30 is attached to the engine unit 20 and the bottom cowling 12 with the top cowling 11 of the cowling 10a removed, and is housed within the cowling 10a covered by the top cowling 11. That is, the fuel tank 30 is connected to the rear upper part of the cylinder body 23, the flywheel magneto 20b, and the starter 20c.
When inserted from obliquely upward into the space formed at the rear of the fuel tank 30, both cylindrical bracket parts 32 of the fuel tank 30
a, 32a are both protrusions 23a, 2 protruding from both rear sides of the cylinder body 23 via the damper member 33.
3a, and the front lower end portion of the main tank portion 30a abuts against a damper member 22a provided on the base 22 of the flywheel magneto 20b. Further, both mounting portions 34a, 34a of the bracket 34 of the fuel tank 30 are placed on the upwardly protruding portion 13 provided at the rear bottom portion of the bottom cowling 12. The upper protrusion 13 is formed in a protruding recess that opens downward, as shown in FIGS. 1 and 5.
Further, an air inlet 13a is formed in the rear side wall. As a result, the upwardly protruding portion 13 functions as a mounting portion for the fuel tank 30, and also functions as a handhold portion and an air introduction portion for the engine unit 20. The bracket 34 of the fuel tank 30 is
The two mounting portions 34a, 34a are fastened and fixed via the damper member 13b. The cap 35 fitted into the filler port 31 of the fuel tank 30 includes an annular flange 35a that comes into contact with a seal rubber 36 interposed between the upper surface of the fuel tank 30 and the lower surface of the top cowling 11. The contact between the lower surface of the annular flange portion 35a and the upper surface of the seal rubber 36 improves sealing performance and improves stability.

In the outboard motor configured in this way, the capacity of the fuel tank 30 can be increased by the capacity of the rear sub-tank section 30b and the side sub-tank section 30c, and the fuel tank 30 can be increased by the capacity of the rear sub-tank section 30b and the side sub-tank section 30c.
Since it is attached to both rear sides of the cylinder body 23 and to the rear of the bottom cowling 12, the engine unit 20 etc. can be placed inside the cowling 10a without any damage to the arrangement. In addition, in this embodiment, a so-called insertion method is used for attaching the fuel tank 30 to the cylinder body 23 by inserting the fuel tank 30 diagonally from above, so that the work of attaching the fuel tank 30 is extremely easy. .

In addition, in the above embodiment, the fuel tank 30
Although an example has been shown in which the upward protruding part 13 provided on the bottom cowling 12, which functions as a handhold part and an air introduction part, is used as the rear attachment part of the The bottom cowling 1 has a large capacity.
It may be directly attached to the bottom of the tank 2, or the lateral sub-tank portions 30c may be provided on both the left and right sides to increase the capacity.

As explained above, the present invention includes an engine that extends in the longitudinal direction, and a flywheel magneto, etc., which is connected to the upper part of the crankshaft that extends in the vertical direction of the engine and is disposed at the upper part of the engine. In an outboard motor in which an engine unit is housed in a cowling, and a rear part of the engine projects rearward from the flywheel magneto, a space formed behind the engine unit in the cowling includes: The structure is characterized by the arrangement of a fuel tank that covers at least the upper and rear parts of the rear protrusion of the engine, which makes effective use of the limited space within the cowling to create a large-capacity fuel tank. can be housed within the cowling.

[Brief explanation of the drawing]

FIG. 1 is a partially longitudinal side view showing the main parts of an outboard motor according to the present invention, FIG. 2 is a plan view of the main parts shown in FIG. 1 with the top cowling removed, and FIG. Enlarged partial vertical sectional side view showing the arrow part, No. 4
The figure is a longitudinal sectional view taken along the - line in FIG. 1, and FIG. 5 is a longitudinal sectional view taken along the - line in FIG. Explanation of symbols, 10a...cowling, 10b...
...Casing, 11...Top cowling, 12
...Bottom cowling, 20...Engine unit, 20a...Engine, 20b...Flywheel magneto, 20c...Starter, 30...
Fuel tank, 30a... Main tank section, 30b...
Rear subtank part, 30c...Side subtank part.

Claims (1)

[Claims] 1. An engine unit whose main components include an engine extending in the longitudinal direction and a flywheel magneto etc. connected to the upper part of the crankshaft extending in the vertical direction of the engine and disposed above the engine is housed in the cowling. In the outboard motor in which the rear part of the engine protrudes rearward from the flywheel magneto, at least above the rear protrusion of the engine is provided in a space formed behind the engine unit in the cowling. and an outboard motor characterized by having a fuel tank that covers the rear.