JPH06129315A - Injection device for outboard engine and arrangement of intake pipe - Google Patents

Abstract

PURPOSE:To facilitate maintenance and prevent a delivery pipe from being damaged from heat by curvedly forming the upper stream side portion of an intake manifold wherein the down stream side communicates to an intake port and making it direct toward one end of an engine. CONSTITUTION:An intake manifold 50 comprises four intake branch pipes 52 and a surge tank 70 arranged upper stream of the intake branch pipes 52. The upper stream side portion of this intake manifold 50 is curvedly formed faced to one end of an engine 36. The downstream side portion of the intake branch pipe 52 of the intake manifold 50 is mounted on an induction port 48, and is extended to one end of the engine 36 to another other end on one side of the engine 36, and is mounted on the surge tank 70. When an outboard engine 2 is assembled, an injector 56 is arranged faced to the induction port 48. Since the upper stream side portion of the intake manifold is curvedly formed to be faced to one end side of the engine, engine width can be made small to be compacted. In addition, maintenance for parts in an ignition system and an injector arranged on other side of the engine is facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the arrangement of an injection device and an intake pipe of an outboard motor, and more particularly to disposing a series engine with the crankshaft oriented vertically in the engine case, In addition, the present invention relates to an arrangement of an injector and an intake pipe of an outboard motor in which an injector is arranged so as to be directed toward the intake port located on the other end side and an ignition system component is arranged on the other side of the engine.

[0002]

2. Description of the Related Art Propulsion devices for ships are roughly classified into three types, namely, an inboard engine (inboard engine), an inboard / outboard engine (inboard / outdrive engine), and an outboard motor (outboard engine), depending on the arrangement.

The inboard engine has an engine installed in the vicinity of the center of the ship and rotates the propeller by a propeller shaft passing through the ship, and is often used in large ships having a total length of about 10 meters or more.

Further, in the inboard / outboard motor, the engine body is installed inside the stern body, the drive unit is arranged outside the ship, and the propeller is rotated.
It is often used on medium-sized ships of 0 meters or less.

Further, the outboard motor is often used in a small boat having a total length of about 6 meters or less, and is attached to the outside of the stern of the hull. This outboard motor has an engine at the top,
A drive mechanism is attached to the bottom of this engine,
The hull is turned by rotating the entire outboard motor in the left-right direction.

Furthermore, as an engine intake device,
As disclosed in JP-A-3-260367, a plurality of independent intake passages connecting a surge tank and each cylinder are curved downward from a connection portion with the surge tank, and then extend substantially horizontally toward each cylinder. In the engine intake device, the cross-sectional shape of the independent intake passage is an elliptical shape whose major axis extends in the bending radius direction of the bending portion between the connection with the surge tank and the end of the bending portion. In the portion extending from the terminal end of the curved portion to the connecting portion with each cylinder in a substantially horizontal direction, the major axis direction is gradually changed from a vertically elongated elliptical shape to a vertically elongated horizontal elliptical shape. There was something.

[0007]

As shown in FIG. 9, an injector 156 directed to a combustion chamber (not shown) is disposed near the intake valve 162 as a conventional injection device and intake engine. . Further, the surge tank 170 of the intake manifold 150 is arranged at the rear portion of the injector 156 (left side in FIG. 9).

In order to reduce the intake resistance in the intake manifold 150, the intake manifold 150 is used.
The intake branch pipe 152 must be directed to the combustion chamber (not shown) on the intake valve 162 side.

For this reason, the intake branch pipe 152 of the intake manifold 150 connecting the surge tank 170 and the intake port 148 is arranged so as to be curved toward the injector 156 so as to bypass the injector 156.

As a result, the engine becomes large,
There was an inconvenience that it was a disadvantage in practice. Moreover, the maintainability of the ignition system component (not shown) disposed at the rear portion (left side in FIG. 9) of the intake valve is deteriorated, and the delivery pipe may be damaged by heat, which is a practical disadvantage. There was an inconvenience.

[0011]

Therefore, in order to eliminate the above-mentioned inconvenience, the present invention arranges a series engine with a crankshaft oriented vertically in a divisible engine case and at the same time as one side of the engine. In addition, in an outboard motor in which an injector is disposed so as to be directed toward the intake port located on the other end side and an ignition system component is disposed on the other side of the engine, the upstream side of an intake manifold whose downstream side communicates with the intake port. It is characterized in that the side portion is curved so as to be directed to one end side of the engine.

[0012]

According to the invention as described above, when the outboard motor is driven, air flows into the upstream side portion of the intake manifold that is curved to direct the engine toward one end side and is supplied to the engine. There is. Also, when assembling the outboard motor, the injector is arranged so as to be directed to the intake port side located on one side of the engine and the other end side, and the ignition system parts are arranged on the other side of the engine to The upstream side portion of the intake manifold, which the downstream side communicates with, is curved to direct one end side of the engine.

[0013]

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

1 to 8 show an embodiment of the present invention. 3 to 7, 2 is an outboard motor, and 4 is a middle unit. The middle unit 4 of the outboard motor 2 is provided with an outboard motor holding portion 6 for mounting the outboard motor 2 on a hull (not shown). A chilled shaft 8 for tilting the outboard motor 2 is attached to the outboard motor holding portion 6.

Further, in the middle unit 4, FIG.
As shown in, the drive shaft 10 is axially supported in the vertical direction. An oil pan 12 is arranged on the upper side near the drive shaft 10, and an exhaust tube 14 is arranged on the lower side.

The drive shaft 10 applies a driving force of a crank shaft 34 of an engine 36, which will be described later, to a gear case 16
It is transmitted to the propeller 18 via an internal gear (not shown).

A gear case 16 is attached to the lower portion of the middle unit 4. A gear (not shown) connected to the lower end of the drive shaft 10 is accommodated in the gear case 16. A propeller 18 connected to the gear (not shown) is rotatably attached to the gear case 16.

Further, on the upper part of the middle unit 4,
The engine case 20 is attached. The engine case 20 is composed of a lower case 22 and an upper case 24. The upper case 24 has a recessed upper rear portion, and an air intake 26 that opens upward (upper side in FIG. 7) is formed in this recessed portion.

Furthermore, a cover portion 28 having a substantially L-shaped cross section is attached to the recessed portion. The cover portion 28 is formed with an opening portion 30 that opens to the rear portion (left side in FIG. 7) when attached to the recessed portion.

In the space 32 formed in the engine case 20, a four-cycle engine 36 is arranged with the crankshaft 34 oriented vertically.

Cylinder block 38 of the engine 36
Is arranged at a substantially central portion of the space 32. A cylinder head 40 and a cylinder head cover 42 are sequentially attached to the rear portion (left side in FIG. 7) of the cylinder block 38.

The crankshaft 34 is pivotally supported by a crankshaft holding portion 44 on the front portion (right side in FIG. 7) of the cylinder block 38.

An intake port 48 communicating with the combustion chamber 46 is formed on one side of the cylinder head 40. The intake port 48 has an intake branch passage 5 formed by a second intake branch pipe 52 of an intake manifold 50 described later.
4 are in communication. In the vicinity of this intake port 48,
An injector 56 is provided. Injector 56
The delivery pipe 58 is connected to the. The intake port 60 of the intake port 48 is opened and closed by an intake valve 62. An ignition plug 64, which is an ignition system component, is attached to a substantially central portion of the combustion chamber 46 while inclining to the other side of the small engine 36. A high tension cord 66 is connected to the ignition plug 64, and an ignition coil 68 is connected to the high tension cord 66. The high tension cord 66 and the ignition coil 68 are arranged on the other side of the engine 36.

The upstream side portion of the intake manifold 50, which is connected to the intake port 48 on the downstream side, is connected to the engine 3
It is curved so as to be directed to one end side of 6.

More specifically, the intake manifold 50 is
It is composed of four intake branch pipes 52 and a surge tank 70 arranged on the upstream side of the intake branch pipes 52.
A throttle body 72 is arranged on the upstream side of the surge tank 70.

The throttle body 72 is the engine 3
6 is disposed at one end (right side in FIG. 1) of the engine 36 toward the other side (upper side in FIG. 1).

Further, the intake branch pipe 5 of the intake manifold 50.
The downstream side portion of 2 is attached to the intake port 48 portion. The intake branch pipe 52 extends from one end (lower side in FIG. 1) of the engine 36 to the other end of the engine 36 and is attached to the surge tank 70. The surge tank 70 is attached to the throttle body 72.

Next, the operation will be described.

When the outboard motor 2 is driven, the engine 3
Intake manifold 5 curved so as to be directed to one end side of 6
Air flows into the upstream side portion of 0 and is supplied to the engine 36.

When the outboard motor 2 is assembled, the injector 56 is arranged so as to be directed toward the intake port 48 located on one side and the other end of the engine 36, and the other side of the engine 36 is provided. A spark plug 64, a high tension cord 66, and an ignition coil 68 are provided, and an upstream side portion of the intake manifold 50, which is connected to the intake port 48 on the downstream side, is curved so as to be directed to one end side of the engine 36.

As a result, as shown in FIG. 2, the width of the engine 36 can be reduced by the length L, the engine 36 can be made compact, and the upstream and downstream side portions of the intake manifold 50 can be attached to the engine 36. You can
The mounting rigidity of the intake manifold 50 can be improved, which is practically advantageous.

Further, since the upstream side portion of the intake manifold 50 is curved so as to be directed to the one end side of the engine 36, the spark plug 64, the high tension cord 66, and the ignition provided on the other side of the engine 36. It is possible to improve the maintainability of the coil 68 and the injector 56, maintain good heat dissipation of the delivery pipe 58, and improve the vapor lock resistance of the delivery pipe 58, which is practically advantageous.

Further, the injector 56 is arranged near the intake port 48 which is one side of the engine 36, and the ignition plug 64, the high tension cord 66, the ignition coil 68 and other ignition system parts are arranged on the other side of the engine 36. By arranging, it is possible to reduce the influence of noise of the ignition system parts on the injector 56.

[0034]

As described in detail above, according to the present invention, since the upstream side portion of the intake manifold whose downstream side communicates with the intake port is curved so as to be directed to the one end side of the engine, the engine width can be reduced, The engine can be made compact, and the upstream and downstream side portions of the intake manifold can be attached to the engine, and the attachment rigidity of the intake manifold can be improved, which is practically advantageous. Further, since the upstream side portion of the intake manifold is curved so as to be directed to the one end side of the engine, it is possible to improve the maintainability of the ignition system parts and injectors arranged on the other side of the engine, which is practically advantageous.

[Brief description of drawings]

FIG. 1 is a sectional view taken along the line 〓-〓 of FIG. 7 showing an embodiment of the present invention.

FIG. 2 is a schematic explanatory diagram of an intake system of the engine.

FIG. 3 is a front view of an outboard motor.

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

FIG. 5 is a rear view of the outboard motor.

FIG. 6 is a right side view of the outboard motor.

7 is a cross-sectional view taken along the line 〓-〓 of FIG.

FIG. 8 is an explanatory view of a main part of the outboard motor.

FIG. 9 is a schematic explanatory diagram of an intake system of an engine showing a conventional technique of the present invention.

[Explanation of symbols]

 2 Outboard motor 4 Middle unit 16 Gear case 18 Propeller 20 Engine case 26 Air intake 28 Cover part 30 Opening 32 Space part 34 Crankshaft 36 Engine 46 Combustion chamber 48 Intake port 50 Intake manifold 52 Intake branch pipe 54 Intake branch passage 56 Injector 58 Delivery pipe 60 Intake port 62 Intake valve 64 Spark plug 66 High tension cord 68 Ignition coil 70 Surge tank 72 Throttle body

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[Procedure amendment]

[Submission date] December 8, 1992

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 9]

[Figure 4]

[Figure 5]

[Figure 6]

[Figure 7]

[Figure 8]

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Nobuyuki Shomura, 300 Takatsuka-cho, Hamamatsu-shi, Shizuoka, Suzuki Stock Company (72) Hidehiko Yoshioka, 300, Takatsuka-cho, Hamamatsu-shi, Shizuoka (72) Invention Jiro Saika 300, Takatsuka-cho, Hamamatsu-shi, Shizuoka Suzuki Stock Company

Claims (1)

[Claims] 1. A crankshaft is vertically oriented in a separable engine case to arrange a series engine, and an injector is oriented to a side of an intake port located on one side and the other side of the engine. In the outboard motor having the ignition system component arranged on the other side of the engine, the upstream side portion of the intake manifold whose downstream side communicates with the intake port is curved so as to be directed to the one end side of the engine. Arrangement of the injection device and intake pipe of the outboard motor.