JPH11107765A - Outboard engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent penetration of water into various kinds of auxiliary machines and the like by arranging a first driven member, which is driven by means of a rotor via a belt, on the engine end part, arranging a second driven member on the engine side part, and forming a driving unit for driving the second driven member below the maximum diameter part, of the rotor. SOLUTION: In an engine main body, in which a crank shaft is arranged vertically and a flywheel magneto 14 is installed in the crankshaft upper part, of an outboard engine, an air compressor 24, a starter motor 44, and an alternating current generator 46 as auxiliary machines are arranged in the upper part, of the engine main body. A belt 48 is wrapped around the alternating current generator 46 and the air compressor 24 via the flywheel magneto 14 and an idler pulley 50, so that the generator 46 and the air compressor 24 are connect to each other so as to transmit their motion mutually. The flywheel magneto 14, the air compressor 24, the starter motor 44, the alternating current generator 46, the belt 48, and the idler pulley 50 are covered with a common waterproof cover 52, so that water penetration into these auxiliary machines can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-cylinder injection engine for an outboard motor, and more particularly to a waterproof structure for this type of engine.

[0002]

2. Description of the Related Art Generally, in a two-cycle engine,
For the purpose of solving problems such as irregular combustion and fresh air,
There is an in-cylinder injection engine that injects fuel directly into the engine combustion chamber together with pressurized air, and this type of engine is sometimes used as an engine for an outboard motor. Here, as an accessory in the direct injection engine, an air compressor for obtaining the pressurized air, an AC generator for supplementing a drive power supply for a fuel injector and other electric components and charging a battery, and the like are starter motors. Attached to the upper part of the engine body together with a flywheel magneto and the like, these members are interlocked with each other via a transmission mechanism such as a belt.

[0003]

The engine is covered by a cowling. However, since the water such as seawater enters the cowling, it is necessary to protect the above-mentioned members attached to the upper part of the engine body from water. There is.
However, in the related art, a cover is attached to the flywheel magneto, but at present, other accessories and starter motors are not protected at all in the cowling.

[0004] The present invention has been made in view of such prior art, and its object is to prevent various accessories and the like provided on the upper part of the engine main body from entering water.
An object of the present invention is to provide an outboard motor that ensures smooth operation of these devices.

It is another object of the present invention to suppress an increase in the number of parts and to simplify the structure.

[0006]

In order to achieve this object, the present invention provides an outboard motor in which a disk-shaped rotating body is installed at the upper end of a vertically arranged crankshaft above an engine body covered with a cowling. A first driven member driven by the rotating body via a belt is disposed at an end of the engine;
Further, the second driven member is arranged on the engine side, and
A driving unit for driving the second driven member with a smaller diameter than a maximum diameter portion of the rotating body is formed.

A first embodiment of the present invention is characterized in that a rotating device rotatable together with the rotating body is provided on the engine side opposite to the second driven member.

In a second mode, the rotating body, the first and second driven members, the rotating device, and the belt are covered with a single cover. In this way, by making devices such as flywheel magnetos be covered by one cover,
The number of parts is smaller than when each device is covered with a different cover, which can reduce the cost and increase the cost. It is possible to effectively prevent water from entering from a movable part such as a motor.

Further, according to the present invention, the driven member and the rotating device are arranged around the engine in a well-balanced manner.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments shown in the drawings.

FIGS. 1 and 2 show a two-stroke V-type six-cylinder in-cylinder injection type engine for an outboard motor to which the present invention is applied. A crankshaft 12 is vertically disposed on the engine body denoted by reference numeral 10, and a flywheel magneto 1 protruding from the engine body 10 above the crankshaft 12.
4 is attached. Pistons (not shown) arranged horizontally are connected from the crankshaft 12 via connecting rods (not shown), and each piston is housed in a cylinder 16 arranged in a V-shape and three in two banks. . In particular, as shown in FIG. 2, an injector 18 is provided at the head of each cylinder 16, and fuel from a fuel pump (not shown) is supplied to the injector 18 through a water separator 20.
It is supplied via a fuel pump 22 and pressurized air is supplied from an air compressor 24. Reference numeral 26 denotes a damper for controlling fuel pulsation.

In FIG. 1, reference numeral 28 denotes an intake passage, and the intake passage 28 is arranged in a substantially U-shape as a whole in a plane perpendicular to the longitudinal axis of the engine body 10. An intake silencer 30 is disposed at an upper end of the substantially U-shaped intake passage 28 at a position adjacent to the flywheel magneto 14. 32 is the intake silencer 3
0 air inlet. 34 is the intake passage 2
A throttle sensor 36 for detecting the opening of a throttle valve (not shown) provided upstream of 8, and a control lever 36 which is linked to an oil pump (not shown) via a link 37. A cover 38 is further attached to the front surface of the substantially U-shaped intake passage 28, and a device for controlling the engine is housed in the cover 38. The entire engine body 10 thus configured is covered with a bottom cowl 40 and a top cowl 42 detachably attached to the bottom cowl 40.

As shown in FIG. 2, the air compressor 24 is disposed above the engine body 10. In addition to the air compressor 24, a starter motor 44 that meshes with the link gear of the flywheel magneto 14 and drives the flywheel magneto 14 at the time of starting is provided on the upper part of the engine body 10.
In addition, an alternator 46 is provided. Here, the alternator 46, the flywheel magneto 14, and the air compressor 24 are connected so as to be wrapped and transmitted by a belt 48 via an idler pulley 50, and the belt 48 is moved by the movement of the alternator 46. The tension is adjusted.

A flywheel magneto 14, an air compressor 24, a starter motor 4
4. Alternator 46, belt 48, idler pulley 50
Are covered by one integral waterproof cover 52.
The waterproof cover 52 is fixed at one end to a side surface of the intake silencer 30 via a mounting pin 54,
Further, it is fixed to the engine body 10 via brackets 56 at substantially symmetrical positions at the other two places.

With the above configuration, the above-mentioned auxiliary equipment such as the flywheel magneto 14 disposed on the upper part of the engine body 10 is covered by one integral waterproof cover 52, so that these auxiliary parts are covered. Water can be prevented from entering the machinery, and smooth operation of these accessories can be ensured. Compared with a case where these accessories are separately covered with a cover, the structure is simpler and the number of parts is reduced, so that an increase in cost can be prevented.

The waterproof cover 52 is made of a material as rigid as possible, for example, FRP.

[0017]

As described above, according to the present invention,
Since the accessories installed on the upper part of the engine body are covered by one cover, even if water enters the cowling, water can be effectively prevented from entering these accessories. Further, the outboard motor can be provided in a state in which the number of parts is suppressed from increasing and the structure is simplified.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a waterproof structure of an in-cylinder injection engine for an outboard motor according to the present invention.

FIG. 2 is a plan view in a state where a waterproof cover of FIG. 1 is removed.

[Explanation of symbols]

10 Engine body 14 Flywheel magneto 24 Air compressor 44 Starter motor
46 ... Alternator 48 ... Belt 52 ... Waterproof cover

Claims (3)

[Claims] 1. An outboard motor in which a disk-shaped rotating body is installed at the upper end of a vertically disposed crankshaft above an engine body covered with a cowling, and is driven by the rotating body via a belt. 1 Place the driven member at the engine end,
Further, the second driven member is arranged on the engine side, and
An outboard motor, wherein a drive portion for driving the second driven member with a smaller diameter than the maximum diameter portion of the rotating body is formed. 2. The outboard motor according to claim 1, wherein a rotating device rotatable together with the rotating body is provided on an engine side opposite to the second driven member. 3. The outboard motor according to claim 1, wherein the rotating body, the first and second driven members, the rotating device, and the belt are covered by a single cover. .