JP2002187596A - Starter motor cooling structure for outboard motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a starter motor cooling structure for an outboard motor capable of preventing an abnormal rise in temperature due to the heat generation of auxiliary machines of an engine and a starter motor itself. SOLUTION: In this starter motor cooling structure of the outboard motor 1 in which an engine 10 is vertically placed in a cowling 11 so that a crankshaft 12 is approximately vertical during sailing, the starter motor 62 is provided with water jackets 67, 68 into which cooling water of the engine 10 is supplied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling structure for a starter motor for starting an engine mounted on an outboard motor.

[0002]

2. Description of the Related Art Generally, in an outboard motor, an engine is disposed vertically in a substantially watertight cowling such that a crankshaft is substantially vertical when the engine is running, and a drive shaft is provided at one end of the crankshaft. The screw is connected to the flywheel via a ring gear, and a flywheel having a ring gear formed at the other end thereof is mounted, and the starting gear of the starter motor is meshed with the ring gear.

Further, in the above-mentioned outboard motor, conventionally, in order to suppress an abnormal rise in temperature in the cowling, water sucked up by a cooling pump is sequentially supplied to an exhaust system, an engine body, an oil pan, etc., and used cooling water is used. In some cases, a cooling structure for discharging water into water may be employed.

[0004]

The starter motor is susceptible to the heat of the engine body or the heat of the ignition system and the charging system, and the starter motor itself may generate heat due to repeated cranking. Depending on the situation, the temperature may exceed the upper limit temperature of use.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a starter motor cooling structure for an outboard motor which can prevent an abnormal rise in temperature due to heat generated by an engine body and heat generated by a starter motor itself. .

[0006]

According to the first aspect of the present invention, there is provided a starter motor cooling structure for an outboard motor in which an engine is disposed vertically in a cowling such that a crankshaft is substantially vertical when traveling. A water jacket is provided on the starter motor, and the cooling water for the engine is distributed and supplied into the water jacket.

According to a second aspect of the present invention, in the first aspect, the starter motor is disposed at a front side of a crankcase so as to be parallel to the crankshaft.

According to a third aspect of the present invention, in the first or second aspect, the water jacket comprises an upper jacket and a lower jacket surrounding the upper and lower portions of a motor case of the starter motor, and the upper and lower jackets are formed of the motor. It is characterized in that it is formed separately from the case and attached to the motor case.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the starter motor is surrounded by an intake manifold.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, cooling water taken out from an upper portion of a cooling jacket of an exhaust system of the engine is introduced into the water jacket and exits the water jacket. The cooling water is discharged to the outside of the cowling in a visible state.

[0011]

In the starter motor cooling structure according to the first aspect of the present invention, a water jacket is formed on the starter motor, and engine cooling water is supplied into the water jacket. The influence of heat generation and self-heat generation due to repeated cranking can be suppressed, an abnormal temperature rise exceeding the upper limit temperature of use of the starter motor can be prevented, and a starting failure can be prevented.

According to the second aspect of the present invention, since the starter motor is disposed in front of the crankcase in parallel with the crankshaft, the starter motor can be disposed by effectively utilizing an empty space in the cowling.

According to the third aspect of the present invention, since the water jacket is constituted by the upper and lower jackets and is formed separately from the motor case, the water jacket is made of a casting separate from the motor case, for example. Attaching to the motor case facilitates manufacture and suppresses an increase in cost.

According to the fourth aspect of the present invention, since the starter motor is surrounded by the intake manifold, the influence of heat from the outside can be suppressed by the heat absorption of the intake manifold, and from this point too, the abnormal temperature rise can be prevented.

According to the fifth aspect of the present invention, since the cooling water taken out from the upper part of the cooling jacket of the exhaust system is supplied to the water jacket, a stable cooling water amount can be secured, and the cooling can be reliably performed. it can. Further, since the cooling water supplied to the water jacket is visually discharged to the outside of the cowling, the supply state of the cooling water to the starter motor can be visually confirmed.

[0016]

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

FIGS. 1 to 4 are views for explaining a starter motor cooling structure for an outboard motor according to one embodiment of the present invention, and FIG. 1 is a partial sectional plan view of an engine mounted on the outboard motor. 2 is a side view of the engine, FIG. 3 is a perspective view of the starter motor, and FIG. 4 is a side view of the outboard motor.

In FIG. 1, reference numeral 1 denotes an outboard motor, and the outboard motor 1 is pivotally supported vertically and horizontally by a clamp bracket 3 fixed to a stern 2a of a hull 2. The outboard motor 1 has an upper case 8 in which a drive shaft 7 connected to the forward / reverse switching mechanism 5 is inserted on a lower case 6 in which a propulsion shaft 4 having a screw 4a and a forward / backward switching mechanism 5 are disposed. And an engine 10 is mounted on the upper case 8 via an exhaust guide 9, and the periphery of the engine 10 is surrounded by a cowling 11.

The engine 10 is a water-cooled 4-cycle V
A six-cylinder engine, in which a crankshaft 12 is disposed vertically so as to be substantially vertical when traveling, and the drive shaft 7 is connected to a lower end of the crankshaft 12. The cylinder block 15 of the engine 10 includes left and right cylinder portions 16 and 17 formed in a V shape (V bank) toward the rear of the hull, and both cylinder portions 1 and 17.
Common crankcase part 18 integrally formed with 6, 17
A crankcase body 19 is connected to the front mating surface of the crankcase portion 18. A crankcase cover 20 forming a lubricating oil chamber is mounted on the front side of the crankcase book 19.

Three cylinders are formed in each of the cylinder portions 16 and 17, and a piston 25 connected to the crankshaft 12 by a connecting rod 24 is slidably inserted into each cylinder. Left and right cylinder heads 26, 27 are fastened to the rear mating surfaces of the left and right cylinder portions 16, 17, respectively.
The head cover 22 is attached to 27. In addition, each cylinder head 26, 27 has an intake port 26a, 27
a, intake valve 2 for opening and closing exhaust ports 26b and 27b
8, an exhaust valve 29 is provided, and each of the valves 28, 29
Are driven to open and close by intake and exhaust camshafts 30 and 31.

Each of the intake ports 26a, 27a is led out to the outer wall surface of the V-bank of the cylinder heads 26, 27, and an intake system is connected to each of the intake ports 26a, 27a. The intake system is bilaterally symmetric, and the intake pipes 3 are provided at the intake ports 26a and 27a so as to face forward of the hull.
4, a throttle body 35 having a built-in throttle valve (not shown) is connected, an intake manifold 36 is connected to each of the throttle bodies 35, and each of the intake manifolds 3 is connected.
6 is extended forward of the hull, bent inward in front of the crankcase cover 20, and common surge tanks 38, 39 are connected to the upstream ends of the left and right intake manifolds 36, 36, respectively. ing. The intake ports 38a, 39a of the surge tanks 38, 39 are opened inward so as to face the crankcase cover 20.

A fuel injection valve 40 is inserted into the inner wall of each of the throttle bodies 35, and each of the fuel injection valves 40 is arranged with its injection port directed downstream of the throttle valve. A common fuel rail 41 is connected to each of the left and right fuel injection valves 40.

A vapor separator tank 42 which supplies fuel to the left and right fuel rails 41 and separates bubbles in the fuel is provided between the right side intake manifold 36 and the right side intake manifold 36 in FIG. Is disposed, and a fuel filter (not shown) is disposed in front of the vapor separator tank 42. Fuel supply pipe (not shown) for supplying fuel to the vapor separator tank 42
Extends from the vapor separator tank 42 to the left side in the ship width direction between the crankcase cover 20 and each of the surge tanks 38 and 39, and is connected therefrom to a fuel tank (not shown) arranged on the hull 2 side.

Each of the exhaust ports 26b and 27b is led out to the inner wall surface of the V-bank of each of the cylinder heads 26 and 27, and an exhaust system is connected to each of the exhaust ports 26b and 27b. The exhaust system includes the left and right cylinder heads 2.
Exhaust ports 26b, 27 are provided on the inner side walls of V banks 6, 27, respectively.
b, the exhaust merging passages 45 and 46 communicating with the crankshaft 12
And each of the exhaust merging passages 45, 4.
6 is connected to a common exhaust pipe 47 at the downstream end.
Is opened to the exhaust expansion chamber 8a in the upper case 8.

The exhaust gas of the engine 10 is discharged from each exhaust port 26b, 27b through an exhaust merging passage 45, 46 to an exhaust expansion chamber 8a from an exhaust pipe 47, and from there, an outer peripheral portion of the propulsion shaft 4 in the lower case 6. And discharged into the water (see dashed arrows in FIG. 4).

The engine 10 is connected to a cooling system. This cooling system supplies cooling water sucked from a water intake port 50a of a cooling water pump 50 mounted on the lower end of the drive shaft 7 to an exhaust system and an engine body through a cooling water supply passage 51, and then into the water. It is configured to discharge (see the solid arrow in FIG. 4). Specifically, the cooling water pressurized by the cooling water pump 50 rises in the cooling water supply passage 51, and the left and right exhaust merging passages 45,
Cooling water jackets 45a, 45
6a, is introduced from the upper end into an oil cooling passage formed in a main oil passage (not shown), and then flows sequentially into the cylinder heads 26, 27 and the cooling water jackets 26a, 27a, 15a of the cylinder block 15. Cool around the cylinder. The cylinder block 15 is divided into two parts. One of the cooling water cools the outer surface of an oil pan 52 connected to the lower surface of the exhaust guide 9 and is discharged from the lower case 6 into the water. The outer peripheral portion of the cooling device 47 is cooled and discharged into water together with the exhaust gas.

A flywheel 55 is mounted on the upper end of the crankshaft 12, and a ring gear 56 is fixed to the outer peripheral surface of the flywheel 55. A crank pulley 57 is mounted below the flywheel 55 of the crankshaft 12.
Is connected via a timing belt 59 to a cam pulley 58 mounted on the left and right exhaust camshafts 31,31. Reference numeral 60 denotes a tensioner for adjusting the tension of the timing belt 59.

A starter motor 62 is provided above the front wall of the crankcase cover 20. A fuse box and a relay box (not shown) are provided below the starter motor 62, and each box is attached to the crankcase cover 20. At the lower end of the crankcase cover 20, an oil filter 70 for filtering lubricating oil is mounted.

The starter motor 62 is surrounded by the crankcase cover 20, the left and right surge tanks 38, 39 and the intake manifolds 36, 36, and houses a motor body (not shown) in a motor case 63. A drive gear 65 is mounted on a rotating shaft 64 of the motor body. The drive gear 65 rises during rotation and can mesh with the ring gear 56.

A plurality of bosses 20a are formed on the front wall of the crankcase cover 20 so as to protrude forward, and the flanges 63a of the motor case 63 are bolted to the bosses 20a. The starter motor 62 is arranged so that the drive gear 65 faces upward and is parallel to the crankshaft 12. A drive gear moving motor 66 is attached to the starter motor 62. The motor 66 raises the drive gear 65 when the engine 10 starts.

The starter motor 62 has an upper side,
Lower water jacket (upper and lower jacket) 6
7, 68 are provided. Each of the water jackets 67, 68 is made of a casting formed separately from the motor case 63, and the upper water jacket 67 is attached so as to surround the upper part of the motor case 63, and the lower water jacket 67 is provided. 68 is a motor case 63
Is mounted so as to surround the lower end of the. Water inlets 67a, 68a and drains 67b, 68b are formed on the lower walls of the water jackets 67, 68, respectively.

A cooling water outlet 71 is connected to an upper portion of the cooling water jacket 45a of the exhaust merging passage 45 on the left side of FIG. 1, and a cooling water hose 7 is connected to the cooling water outlet 71.
2 are connected. The cooling water hose 72 extends downward from the cooling water outlet 71, and is
Extends forward along the left inner wall surface, and further bends inward from the front end thereof, from which it is branched by a branch pipe 73 and connected to the water inlets 67a, 68a.

A drain hose 75 is connected to each of the drain ports 67b and 68b, and the drain hose 75 is connected to a branch pipe 77.
After that, it opens outside the cowling 11 via a nipple 76 attached to the right cowling 11.

Next, the operation and effect of this embodiment will be described.

In the present embodiment, the upper and lower water jackets 67,
Since the cooling water taken out from the upper part of the cooling water jacket 45a of the exhaust merging passage 45 is introduced into each of the water jackets 67, 68, the starter motor 62 can be constantly cooled, and the heat generated by the engine body or The influence of the heat generated by the ignition system and the charging system and the self-generated heat due to repeated cranking can be suppressed to prevent an abnormal rise in the temperature of the starter motor 62 and, consequently, to prevent poor starting.

Further, since the starter motor 62 is disposed on the front wall of the crankcase cover 20 so as to be parallel to the crankshaft 12, an empty space formed by the crankcase cover 20 and the surge tanks 38 and 39 in the cowling 11 is reduced. The starter motor 62 can be disposed by effectively utilizing it.

Further, the upper and lower water jackets 6
Since the casings 7 and 68 are formed of a separate casting from the motor case 63, the manufacture of the water jackets 67 and 68 is easy, and the increase in cost can be suppressed. Further, since the water jackets 67 and 68 are formed independently, the degree of freedom of the arrangement position on the motor case 63 can be improved.

In this embodiment, the starter motor 62
Is surrounded by the left and right surge tanks 38, 39 and the intake manifolds 36, 36, the influence of heat from the outside can be suppressed by the heat absorption by the intake manifold 36, and from this point too, an abnormal rise in temperature can be prevented.

Further, since the cooling water taken out from the upper portion of the cooling water jacket 45a is introduced into the upper and lower water jackets 67 and 68, a stable cooling water amount can be secured, and the starter motor 62 can be reliably mounted. Can be cooled.

Each of the above water jackets 67, 68
The cooling water introduced into the cowling 11 is visually discharged to the outside of the cowling 11, so that the state of supply of the cooling water to the starter motor 62 can be easily checked visually.

In the above embodiment, the exhaust merging passage 4
5, the cooling water taken out from the cooling water jacket 45a is introduced into each of the water jackets 67 and 68 of the starter motor 62. However, the supply of the cooling water of the present invention is not limited to this. Cooling water may be taken out from the cooling cooler to be cooled and supplied to the starter motor. In this case, the same effect as described above can be obtained.

In the above embodiment, the case where each of the water jackets 67 and 68 is formed of a casting separate from the motor case 63 has been described. However, the water jacket of the present invention may be formed integrally with the motor case.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional plan view of an engine for explaining a starter motor cooling structure supplied outboard according to an embodiment of the present invention.

FIG. 2 is a side view of the engine.

FIG. 3 is a perspective view of a starter motor provided in the engine.

FIG. 4 is a side view of the outboard motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outboard motor 10 Engine 11 Cowling 12 Crankshaft 20 Crankcase cover 36 Intake manifold 62 Starter motor 63 Motor case 67, 68 Water jacket

Claims (5)

[Claims] 1. A starter motor cooling structure for an outboard motor in which an engine is disposed vertically in a cowling such that a crankshaft is substantially vertical when the ship is running, a water jacket is provided on the starter motor, A starter motor cooling structure for an outboard motor, wherein the cooling water for the engine is distributed and supplied into a jacket. 2. The starter motor cooling structure for an outboard motor according to claim 1, wherein the starter motor is disposed in front of a crankcase so as to be parallel to the crankshaft. 3. The motor jacket according to claim 1, wherein the water jacket comprises an upper jacket and a lower jacket surrounding an upper and a lower part of a motor case of the starter motor, and the upper and lower jackets are separate from the motor case. A starter motor cooling structure for an outboard motor, wherein the starter motor cooling structure is formed in the motor case. 4. The starter motor cooling structure for an outboard motor according to claim 1, wherein the starter motor is surrounded by an intake manifold. 5. The cooling water according to claim 1, wherein cooling water taken out from an upper portion of a cooling jacket of an exhaust system of the engine is introduced into the water jacket, and the cooling water leaving the water jacket is supplied to the cowling. A starter motor cooling structure for an outboard motor, wherein the starter motor is discharged in a visible state outside of the motor.