JP3418104B2 - Outboard motor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outboard motor detachably attached to a stern for propulsion of a ship.

[0002]

2. Description of the Related Art Such an outboard motor is arranged in a casing mounted on a hull via a bracket, an engine cover detachably attached to the upper surface of the casing, and an engine room defined by the casing and the engine cover. And a drive shaft connected to the output shaft of the engine in the vertical direction in the casing. A propeller is provided on a propeller shaft that extends vertically and is connected to the lower end in the front-rear direction.

Therefore, as the engine for the outboard motor, a vertical type engine in which the crankshaft is arranged in the vertical direction is adopted, and in the case of a multi-cylinder engine, the center line of each cylinder is oriented horizontally in the front-rear direction. It has been practiced to arrange these cylinders vertically (for example, see Japanese Utility Model Publication 57-31934).
issue).

With the recent increase in size of engines for outboard motors,
Although a relatively large oil filter is provided, this oil filter is a cylinder block so that the engine as a whole is roughly oval when viewed from above and has a shape suitable for an outboard engine to be housed in the casing. Is projected on the side surface (for example, Japanese Patent Laid-Open No. 60-27662).

[0005]

By the way, in an outboard motor engine, not only an oil filter but also various accessories and parts are provided on the side surface of the engine and have a shape suitable for housing the engine in a casing. In particular, it is necessary to install other auxiliaries and parts reasonably to avoid interference with the carburetor that occupies a relatively large space on one side of the engine and the large oil filter. desired.

Accordingly, the present invention is intended to provide a rational auxiliary machine and an outboard motor having parts arranged to solve the above problems, and in particular, electric parts and starter connected to a spark plug. It is intended to enable a suitable arrangement of the motor .

[0007]

The invention according to claim 1 of the present application is a casing mounted on a hull via a bracket, an engine cover detachably attached to the upper surface of the casing, the casing and the engine cover. Place the crankshaft upward in the engine room formed by
Place it downwards and place the crankcase forward
Place the cylinder head in the rear and
The engine body including the case and the
In an outboard motor consisting of the above spark ignition engine having a plurality of cylinders, a cylinder block and a crankcase
Intake including an oil pan disposed below the engine crank chamber defined by the base, a carburetor disposed on one side of the engine along the side, and an air intake pipe connected to the carburetor. An intake pipe having a device, an electric component arranged on the other side surface of the engine and connected to a spark plug, and a starter motor arranged in front of the engine crank chamber, and the electric component Is composed of a plurality of ignition coils and a CDI unit separate from the ignition coils.

According to the first aspect of the present invention, the engine electric component is arranged on the side surface of the intake device including the carburetor and the air intake pipe connected to the carburetor, which is on the side opposite to the side on which the intake device is arranged. since the starter motor is disposed in front of the crank chamber, as a result of electrical components without interference of the intake device and the starter motor including a carburetor and the air intake pipe is arranged, these large components to the parts Can be adopted and the outboard motor as a whole can be made compact.

Further, since the electrical component is composed of a plurality of ignition coils and a CDI unit which is separate from the ignition coil, the electrical component is placed on the side surface on the other side, and the configuration around the cylinder head and the oil. It can be easily arranged without being affected by the interference of the filter, and the electric wiring between these electric components and the spark plug is also easy.

Further, the oil pan is located below the crank chamber.
Since it is arranged, the above intake pipe, electrical equipment and star
The motor is easy and rational with a margin around the engine
Can be arranged as desired.

[0011]

1 is a side view of an outboard motor 1 according to the present invention. The outboard motor 1 is attached to the stern with the left side as the front, that is, the hull side. The outboard motor 1 includes a main body case 2,
Engine cover 3 that covers the upper opening of the body case 2
And an engine 5 disposed in an engine room 4 formed by the body case 2 and the engine cover 3 on the top of the body case 2. Engine cover 3
Has a front end portion and a rear end portion which are detachably fixed to the main body case 2 via the attachment / detachment device 6, and the lower edge thereof is attached to the main body case 2
It is attached along the upper edge 7 of the. The engine 5 is attached to the body case 2. The engine 5 has three cylinders 8, 8 and 8 which extend with their axes horizontal in the front-rear direction and which are arranged in a row in the vertical direction.

Therefore, the piston 9 fitted in the cylinder 8
The crankshaft 11 driven by the connecting rod 10 is oriented vertically, and the drive shaft 12 connected to the crankshaft 11 via the interlocking mechanism extends from the engine 5 and the main body case 2
Extends downward inside the downward extension portion of the. A propeller shaft 13 extending rearward is drivingly connected to a lower end of the drive shaft 12, and a propeller 14 is fixed to a rear end portion of the propeller shaft 13 protruding to the outside.

A swivel shaft 15 is provided on the upper front surface of the main body case 2.
A swivel bracket 16 is pivotally mounted via a tilt shaft 17, and a front end portion of the bracket 16 is pivotally mounted via a tilt shaft 17 to a stern bracket 18 provided on the hull. Therefore, the outboard motor 1 attached to the hull can be horizontally rotated about the swivel shaft 15 and can be vertically tilted about the tilt shaft 17.

Next, the structure of the engine 5 will be described in more detail with reference to FIGS. 2 and 3. The main body of the engine 5 is composed of a cylinder block 19, a cylinder head 20, and a crankcase 21, and the crankcase 21 is located at the front.
The cylinder head 20 is arranged rearward and is housed in the engine room 4. As described above, the three cylinders 8 are vertically aligned in the cylinder block 19, and the crankshaft 11 is connected to the pistons 9 in each cylinder 8 via the connecting rod 10.
Extends vertically in a crank chamber 22 defined by a cylinder block 19 and a crankcase 21.

The lower portion of the crank chamber 22 communicates with the oil pan 23. The cylinder head 20 is provided with an intake port 24 on the right side and an exhaust port 25 on the left side for each cylinder 8 and is opened and closed toward the combustion chamber 28 by an intake valve 26 and an exhaust valve 27, respectively. Air intake pipe 29, carburetor 30 and intake pipe 31
An intake system consisting of is arranged in the front-rear direction along the right side surface of the engine body and is connected to the intake port 24. An exhaust passage 32 extending vertically is formed on the left side surface of the rear portion of the cylinder block 19, and the exhaust port 25 communicates with the exhaust passage 32. Exhaust passage 32 through exhaust port 25
The exhaust gas discharged to the outside is discharged from the lower end of the exhaust passage 32 through the outboard motor main body to the outside of the engine. The cylinder head 20 is also provided with three spark plugs 35, 35, 35 corresponding to the three cylinders 8, 8, 8 which are arranged in parallel in the vertical direction. As shown in the figure, they are arranged in a line at equal intervals in the vertical direction. A valve mechanism including a cam shaft 36 and a rocker arm 37 is arranged at the rear of the cylinder head 20, and a cylinder head cover 38 is provided to cover them.

A crankshaft 11 is provided on the upper front side of the engine body.
A charging generator 33 driven by the generator 33 is provided, and a starter motor 34, which is driven and supplied by a battery charged by the generator 33, is attached to the front surface of the crankcase 21.

Lubrication of the required parts of the engine 5 described above
This is performed by circulating the oil stored in the oil pan 23. Therefore, a main oil passage 39 is provided on the left side surface of the cylinder block 19 and in the front part of the exhaust passage 32. The oil in the oil pan 23 is guided to the main oil passage 39, and the main oil passage 39 is used for lubrication. It is designed to be distributed to each department. As described above, in the engine of the outboard motor, oil management is important, and fresh oil must always be supplied to each lubrication part. Therefore, a high-performance engine is installed at the inlet from the oil pan 23 to the main oil passage 39. With the oil filter 40 interposed, the oil from the oil pan 23 enters the main oil passage 39 after being sufficiently cleaned by the oil filter 40. Oil filter 40
Is provided so as to project outward from the cylinder block 19 using a space portion formed in front of the exhaust passage 32 on the left side of the cylinder block 19. As shown in FIG. 2, it is selected above the upper edge 7 of the main body case 2.

FIG. 4 is a side view showing a lubricating system by cutting a main part of the engine body. A trochoidal type oil pump 52 is arranged below the cam shaft 51, the rotor shaft 53 of the pump 52 has its upper end engaged with the lower end of the cam shaft 51, and the pump 52 is driven by the cam shaft 51. . An intake oil passage 54 is provided on the right side of the engine body, and the rear end of the intake oil passage 54 is connected to the intake port 55 of the oil pump 52. A front end of the suction oil passage 54 is connected to an upper end of a suction pipe 57 extending into the oil pan 23, and a screen-shaped oil strainer 58 is provided at a lower end of the suction pipe 57. The discharge port of the oil pump 52 is connected to the discharge oil passage 60. The discharge oil passage 60 extends forward on the lower left side of the engine body and communicates with the oil filter 40. The main oil passage 39 extends upward from the oil filter 40, and the oil filtered by the oil filter 40 is distributed from the main oil passage 39 to each lubricating portion.

On the left side surface of the engine body, an electrical component box 41 is provided adjacent to the oil filter 40. This electrical component box 41 is a cylinder block
A bolt 44 and a bolt are respectively attached to the bracket 42 protruding from the 19 and the bracket 43 protruding from the crankcase 21.
It consists of a bottom portion 41a fastened via 45 and a lid portion 41b that covers the opening facing the outside of the bottom portion 41a in an openable and closable manner. It is located above.

Inside the electrical component box 41, various electrical components such as the CDI unit 46 and a connector 47 for connecting electric wires to these electrical components are collectively housed, and a cylinder above the oil filter 40 is housed. In a portion near the head 20, three ignition coils respectively corresponding to the three ignition plugs 35, 35, 35 arranged in a line in the vertical direction and connection terminals 48, 48, 48 are arranged in a line in the vertical direction. They are arranged side by side. And the corresponding spark plug 35 and ignition coil
48 are connected to each other by a connecting cord 49.

In this embodiment, since the oil filter 40 and the electrical component box 41 are provided on the left side surface of the engine body opposite to the carburetor 30, as described above, the large oil filter 40 and the electrical component parts are provided. Carburetor box 41 30
It can be mounted on the engine without any interference. Since the electric component box 41 is provided on the opposite side of the oil filter 40 from the cylinder head 20, the unitized electric component can be attached to the engine without being affected by the structure around the cylinder head and the interference of the oil filter. Since the connection wiring 49 connecting the electric component and the ignition plug 35 is passed above the oil filter 40,
It is possible to prevent the wiring from becoming dirty due to oil leakage during filter replacement work. Since the wiring 49 is provided with an ignition coil on the way, the ignition plug and the unitized electrical component can be connected linearly, and wasteful wiring can be omitted.

Further, since the engine 5 is disposed above the upper edge 7 of the casing 2, if the engine cover 3 is removed from the casing 2 while the engine 5 is still attached to the casing 2, the oil filter 40 and the The electrical component box 41 is exposed to the outside. Therefore, these maintenance and inspection operations, such as cleaning and replacement of the oil filter 40, inspection of electric components, and disconnection of electric wires for replacement or inspection, can be performed without pulling out the engine 5 from the casing 2, which is extremely convenient. . Also, electrical component box 41
Since it extends from the front to the upper part of the oil filter 40 over a large area, most of the electrical components required for the engine 5 can be accommodated therein, and this also allows maintenance and inspection of the electrical components. Work becomes easy. Further, in the portion close to the cylinder head 20 above the oil filter 40, since each connection terminal 48 is arranged vertically corresponding to each ignition plug 35, connection of the connection cord 49 of each ignition plug 35, It is easy to remove and simplifies the wiring of the cord.

[Brief description of drawings]

FIG. 1 is a side view of an outboard motor according to an embodiment of the present invention.

FIG. 2 is an external side view of an engine in the outboard motor.

FIG. 3 is a horizontal sectional view taken along the axis of one cylinder of the engine.

FIG. 4 is a cutaway side view of an essential part of the engine body, excluding an electrical component box, an oil filter, and the like.

[Explanation of symbols]

1 ... Outboard motor, 2 ... Main body case, 3 ... Engine cover, 4
… Engine room, 5… Engine, 6… Detachment device, 7…
Upper edge, 8 ... Cylinder, 9 ... Piston, 10 ... Connecting rod, 11 ...
Crankshaft, 12 ... Drive shaft, 13 ... Propeller shaft, 14 ... Propeller, 15 ... Swivel shaft, 16 ... Bracket, 17 ... Tilt shaft,
18 ... Stay, 19 ... Cylinder block, 20 ... Cylinder head, 21 ... Crankcase, 22 ... Crank chamber, 23 ... Oil pan, 24 ... Intake port, 25 ... Exhaust port, 26 ... Intake valve,
27 ... Exhaust valve, 28 ... Combustion chamber, 29 ... Air intake pipe, 30 ... Vaporizer, 31 ... Intake pipe, 32 ... Exhaust passage, 33 ... Generator, 34 ... Starting motor, 35 ... Spark plug, 36 ... Camshaft , 37 ... Rocker arm, 38 ... Cylinder head cover, 39 ... Main oil passage, 40 ... Oil filter, 41 ... Electrical component box, 42 ... Bracket, 43 ... Bracket, 44 ... Bolt, 45 ... Bolt, 46 ... C
DI unit, 47 ... Connector, 48 ... Ignition coil and connection terminal, 49 ... Connection cord.

Continuation of front page (56) Reference JP-A-3-32998 (JP, A) JP-A-62-189330 (JP, A) JP-A-60-27734 (JP, A) JP-A-60-27762 (JP , A) JP 62-126227 (JP, A) Actual development 61-58647 (JP, U) Actual development 62-197707 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB) (Name) F02B 67/00 F02B 61/04 B63H 20/00 F02F 7/00 302

Claims (2)

(57) [Claims] 1. A crankshaft is vertically mounted in a casing attached to a hull via a bracket, an engine cover which is detachably attached to an upper surface of the casing, and an engine room formed by the casing and the engine cover.
And place the crankcase forward in the cylinder.
Place the rear panel in the rear and
An engine body portion including a cylinder is defined by a cylinder block and a crankcase in an outboard motor including a spark ignition engine having three or more cylinders accommodated therein.
An oil pan disposed below the engine crank chamber, an intake pipe provided on one side of the engine along the side thereof, and having an intake device including a carburetor and an air intake pipe connected to the carburetor; An electric component arranged on the other side surface of the engine and connected to an ignition plug; and a starter motor arranged in front of the engine crank chamber, wherein the electric component includes a plurality of ignition coils. An outboard motor comprising a CDI unit separate from the ignition coil. 2. The outboard motor according to claim 1, further comprising an oil filter arranged on the other side surface of the engine.