JP2897079B2 - Outboard motor electrical component cooling system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

 [Object of the invention]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric component cooling device for an outboard motor.

[0001]

2. Description of the Related Art Many outboard motors and other marine engines are equipped with a regulating rectifier for rectifying a starting current generated by an alternator and adjusting a voltage to charge a battery. This regulated rectifier is generally air-cooled to suppress overheating, thereby maintaining performance and action and stabilizing them.

[0002] As shown in FIG. 6, an engine unit 1 of an outboard motor is covered with an engine cover 2 and installed on a drive shaft housing 3. In this engine unit 1, as shown in FIG.
This is a V-shaped engine in which the parts holder 5 is disposed between the cylinder blocks 4. Ignition coil and CDI (capacitive discharge ignition)
Electrical components such as units are intensively stored.

[0003] A regulated rectifier 6, which is also an electrical component, is installed on the back of the parts holder 5. As shown in FIGS. 8 and 9, a heat radiating plate 7 having a U-shaped cross section is fixed to the rear surface of the part holder 5, and the regulated rectifier 6 is fixed to the heat radiating plate 7 by bolts. The radiator plate 7 is made of, for example, aluminum.

[0004]

However, if the regulated rectifier 6 is installed as an electrical component at the rear position of the parts holder 5 via the heat radiating plate 7, sufficient cooling air is not necessarily supplied to the regulated rectifier 6. May not be derived. For this reason, if the charge output of the alternator is increased in this installation state, the heat generated in the regulated rectifier 6 cannot be sufficiently dissipated, and the cooling of the regulated rectifier 6 becomes insufficient, and the regulated rectifier 6 becomes insufficient. (A) The temperature of 6 may increase, and the performance and stability of its operation may not be maintained.

The present invention has been made in consideration of the above circumstances, and can improve the cooling efficiency of electric components of an outboard motor and can firmly fix the electric components without adversely affecting engine performance. In addition, an object of the present invention is to provide an electric component cooling device for an outboard motor that can improve the vibration isolation of the electric component.

[Configuration of the Invention]

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an engine unit housed in an engine cover, a gear case supporting a screw, and a space between the engine unit and the gear case. In an outboard motor comprising a drive shaft housing provided with a drive shaft to be connected, the engine unit is mounted on an engine crank shaft extending in a vertical direction, a horizontal cylinder, and a crank case of the engine unit. A carburetor, and a hollow box-shaped silencer case having one end connected to a connection port of the carburetor and an intake opening formed in the engine cover at the other end, wherein the silencer case is opposite to the cylinder head. The silencer case is located on one side of the A recess is provided in the inner wall portion between the connection port to the bretta and the intake opening, and electrical components are mounted in the recess, and cooling fins are formed on a surface of the electrical component facing the silencer case. The longitudinal direction of the cooling fins is set along the direction of the airflow flowing in the silencer case.

[0008]

In the silencer case, a large amount of air is sucked from the intake opening and flows toward the carburetor. However, since the electric component is mounted in the recess provided on the inner wall surface of the silencer case, Cooling of electrical components is suitably performed by the airflow flowing in the case.

In addition, the electric component is installed so as to be buried in a recess formed in the wall surface inside the silencer case, and does not protrude into the silencer case. The cooling fins formed along the direction of the air flow in the silencer case do not disturb the air flow in the silencer case due to the installation of electrical components, and adversely affect engine performance such as a decrease in intake efficiency. There is no danger.

Further, since the electrical component is fitted into the recess inside the silencer case, the electrical component is firmly fixed to the silencer case, and the vibration proof performance of the electrical component is improved.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a side view of an outboard motor to which an embodiment of an electric component cooling device for an outboard motor according to the present invention is applied.
The outboard motor 10 includes, from above, an engine cover 12 in which an engine unit 11 is accommodated, and a drive shaft housing 13 through which a drive shaft (not shown) vertically passes.
And a gear case 15 on which the screw 14 is pivotally supported.

In the engine unit 11, cylinder blocks 17 are arranged in a V shape as shown in FIG. 3 in a crankcase 16, and three cylinders (not shown) oriented in a horizontal direction are vertically arranged in each cylinder block 17. It is a six-cylinder V-type engine. Three carburetors 18 are cascaded in the crankcase 16, and a hollow box-shaped silencer case 1 is provided at a connection port 18 a which is an upstream end face of these carburetors 18.
9 is connected. That is, the silencer case 19 is located on the opposite side of the cylinder head 17a.

In the silencer case 19, an intake opening 20 as shown in FIG. 4 is formed on the end face opposite to the carburetor connection port, and opens into the engine cover 12.
Due to the negative pressure in the crankcase 16, the intake opening 2
From outside, outside air is taken into the silencer case 19, and as shown in FIG.
Inside 9, the air flows from the intake opening 20 toward the connection port 18 a of the carburetor 18 and is guided to the carburetor 18. Reference numeral 21 in the figure denotes a carburetor 18 throttle valve.

As shown in FIG. 1, a silencer case 19 is provided.
Has a connection port 18a to the carburetor 18 and the intake opening 2
A concave portion 19a is formed in the inner wall surface between 0 and 0, and a heat-generating electrical component such as a regulated rectifier 22 is attached inside the concave portion 19a. Regulated Rectifier 2
2 is fitted so as to be in close contact with the bottom surface of the concave portion 19a, and is fixed using a mounting bolt 23.

As shown in FIG. 5, a plurality of cooling fins 24 are formed on the side of the regulated rectifier 22 facing the inside of the silencer case 19, so that the radiation performance of the regulated rectifier 22 is enhanced. .
These cooling fins 24 are formed such that their longitudinal directions are along the direction of the airflow 25 flowing in the silencer case 19.

Since the silencer case 19 is located far from the cylinder block 17 and the cylinder head 17a in which the combustion chamber and the exhaust passage are formed in the engine cover 12, heat is generated by the regulated rectifier 22 which is an electric component. Good environmental conditions and allow for thermal damage.

When the engine unit 10 is started and air is taken into the silencer case 19 from the intake opening 20 of the silencer case 19, the regulated rectifier 22 is forcibly cooled by the air flow 25 flowing through the silencer case 19. Therefore, the heat radiation of the regulated rectifier 22 is sufficient, and the regulated rectifier 22 can be protected from thermal effects.

In this manner, the cooling efficiency of the regulated rectifier 22 is improved, so that the charging output of the alternator and the charging capability of the battery can be increased. The silencer case 19 is always kept at a temperature close to the atmospheric temperature by the air sucked into the carburetor 18, and tends to be cooled by the vaporization heat of the returning fuel, so that the overheating of the regulating rectifier 22 is prevented. It can be suppressed effectively.

The regulating rectifier 22 has a recess 1 formed in a wall surface inside the silencer case 19.
9a, the cooling fins 24 are not protruded into the silencer case 19 except for the cooling fins 24.
Since the air flow 25 is in the direction of the air flow 25 inside the air flow 9, the flow of the air flow 25 is not disturbed, and there is no possibility that the intake efficiency is reduced. Therefore, the installation of the regulating rectifier 22 does not adversely affect the engine performance.

In addition, a regulated rectifier 2
2 is fitted into the concave portion 19a inside the silencer case 19, so that the regulated rectifier 22 is firmly fixed to the silencer case 19, and the vibration proofness for the regulated rectifier 22 is greatly improved. Failure can be prevented.

Further, the surface area of the silencer case 19 is increased by the concave portion 19a formed in the silencer case 19, and the regulating rectifier 22 is installed in the concave portion 19 so as to be in close contact therewith. A22 and silencer case 1
The radiator 9 is an integral radiator, and the temperature of the airflow 25 flowing into the carburetor 18 can be increased with cooling. Therefore, a warming effect of the carburetor 18 can be achieved, and for example, icing and the like can be prevented.

If the regulated rectifier 22 is forcibly cooled by utilizing the flow of the intake air to the engine unit 11 in this manner, there is no need to install a forced cooling means such as an electric fan. The structure can be simplified. Further, as shown in FIG. 3, the silencer case 19 is
7a is located far away from the cylinder head 1
Since it is away from a noise generating source such as a spark plug (not shown) provided in 7a, it is hardly affected by noise, and the noise immunity design of the regulated rectifier 22 can be reduced or omitted.

In this embodiment, the regulated rectifier 22 is exemplified as the electrical component provided in the recess 19a inside the silencer case 19. However, the present invention is not limited to the regulated rectifier 22, and other heat-generating electrical components may be provided in the recess. 19a.

[0025]

As described above, the electrical equipment cooling device for an outboard motor according to the present invention comprises: an engine unit housed in an engine cover; a gear case supporting a screw;
In an outboard motor comprising a drive shaft housing having a drive shaft connecting the engine unit and a gear case, the engine unit includes an engine crankshaft extending vertically, a horizontal cylinder, and an engine. A carburetor attached to the crankcase of the unit, and a hollow box-shaped silencer case having one end connected to a connection port of the carburetor and an intake opening at the other end opening into the engine cover, The silencer case is arranged on one side in the engine cover on the side opposite to the cylinder head, while the silencer case has a recess on the inner wall portion between the connection port to the carburetor and the intake opening, Electrical components are mounted in the recesses, and a cooling filter is provided on the surface of the electrical components facing the silencer case. And the longitudinal direction of the cooling fins is aligned with the direction of the airflow flowing through the silencer case, so that the air flowing through the silencer case does not adversely affect engine performance, such as reducing intake efficiency. The electric component can be positively cooled by the flow, and the electric component can be firmly fixed to the silencer case to improve the vibration isolation of the electric component.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along the line II of FIG. 4;

FIG. 2 is a side view showing an outboard motor to which an embodiment of a regulated rectifier cooling device for an outboard motor according to the present invention is applied;

FIG. 3 is a view taken in the direction of arrow III in FIG. 2;

FIG. 4 is a view taken in the direction of arrow IV in FIG. 3;

FIG. 5 is a sectional view taken along the line VV in FIG. 1;

FIG. 6 is a side view showing an outboard motor to which a conventional regulated rectifier cooling device is applied.

FIG. 7 is a view taken in the direction of arrow VII in FIG. 6;

FIG. 8 is a view taken in the direction of arrow VIII in FIG. 7;

FIG. 9 is a view taken in the direction of the arrow IX in FIG. 8;

DESCRIPTION OF SYMBOLS 10 Outboard motor 11 Engine unit 12 Engine cover 13 Drive shaft housing 14 Screw 15 Gear case 16 Crank case 17 Cylinder block 17a Cylinder head 18 Carburetor 18a Carburetor connection port 19 Silencer case 19a Depression 20 Intake opening 22 Regulated rectifier (Electrical component) 24 Cooling fin 25 Air flow in silencer case

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B63H 20/28 B63H 20/00 F02B 77/00 F02M 35/12

Claims (1)

(57) [Claims] An outboard motor comprising an engine unit housed in an engine cover, a gear case supporting a screw, and a drive shaft housing having a drive shaft connecting the engine unit and the gear case. The engine unit has an engine crankshaft extending vertically, a horizontal cylinder, a carburetor attached to the crankcase of the engine unit, one end connected to a connection port of the carburetor, and the other end A hollow box-shaped silencer case provided with an intake opening that opens into the engine cover. The silencer case is disposed on one side of the engine cover opposite to the cylinder head. The case has a recess on the inner wall between the connection to the carburetor and the intake opening. The electric component is mounted in the recess, and the cooling fin is formed on the surface of the electric component facing the silencer case, and the longitudinal direction of the cooling fin is aligned with the direction of the air flow flowing through the silencer case. An electric component cooling device for an outboard motor.