JP2002021662A - Intake box mounting structure of engine for small ship - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the vibration and heat of an engine from easily transmitting to an electric component mounted in an intake box. SOLUTION: The intake box 36 having the electric component 80 is arranged in the vicinity of the engine 6 mounted on the small ship 1, and the intake box 36 is attached to the engine 6 through resilient members 47-49.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake box mounting structure for a small marine engine.

[0002]

2. Description of the Related Art A small boat, for example, a personal watercraft, is propelled by jetting water backward from an injection nozzle of a jet propulsion device driven by an engine. By turning the deflector of the injection nozzle left and right by operating the handle, the vehicle turns.

The engine of the personal watercraft described above is mounted in an engine room in the hull, and an intake box is connected to an intake pipe of the engine. Then, it is conceivable that the intake box is arranged above the engine and is directly attached to a cylinder head cover or the like.

[0004]

However, when electric components such as fuel injection valves are provided in the intake box, vibrations and heat of the engine are easily transmitted to the fuel injection valves as electric components via the intake box. There was a problem.

The present invention has been made to solve the above-mentioned conventional problems, and provides an intake box mounting structure for a small marine engine in which vibration and heat of the engine are hardly transmitted to electrical components provided in the intake box. The purpose is to do so.

[0006]

In order to solve the above-mentioned problems, the present invention relates to an engine mounted on a small boat, wherein an intake box having electric components is arranged near the engine, and the intake box is The present invention provides an intake box mounting structure for a small marine engine, which is mounted on an engine via an elastic member.

According to the present invention, since the intake box having the electric parts is attached to the engine via the elastic member, the elastic member makes it difficult for the vibration and heat of the engine to be transmitted to the electric parts via the intake box. In addition, the influence on electrical components is reduced.

[0008] The phrase "having the electrical components" includes not only the case where the electrical components are housed in the intake box but also the case where the electrical components are attached to the outer surface of the intake box.

According to a second aspect of the present invention, the intake box is disposed above the engine, and a stay is attached to a cylinder head cover or a cylinder head of the engine. On the stay, the intake box is provided with a first elastic member. On the other hand, if the intake box is attached to the intake pipe via the second elastic member, and a fuel injection valve as an electrical component is attached to the intake pipe in the intake box, The first and second elastic members make it difficult for the vibration and heat of the engine to be transmitted to the fuel injection valve via the intake box, thereby reducing the influence on the fuel injection valve which is an electrical component.

The "intake pipe" is a general term for the third elastic sleeve, the throttle body and the intake funnel in the present embodiment.

According to a third aspect of the present invention, the fuel injection valve mounting portion of the intake pipe to which the fuel injection valve is mounted is connected to the engine intake inlet pipe via a third elastic member. If so, the third elastic member makes it difficult for the vibration and heat of the engine to be transmitted to the fuel injection valve, and the influence on the fuel injection valve is further reduced. In addition, since the heat of the engine is less likely to be transmitted to the intake pipe in the intake box by the third elastic member, the air in the intake pipe box is less likely to be heated by the heat of the intake pipe, which is preferable in improving the intake efficiency.

Preferably, the elastic member is a vibration-proof and heat-proof rubber material from the viewpoint of moldability and cost.

[0013]

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

As shown in FIGS. 1 and 2, the personal watercraft 1
The hull member 2 and the deck member 3 are joined at their peripheral edges to form a hull 4, and an engine room 5 formed in the hull 4 substantially at the center in the front-rear direction is provided with an engine 6 A fuel tank 7 is installed in front of the engine 6, and a jet propulsion device 8 is installed behind the engine 6.

A foot step 3a is formed on each side of the deck member 3, and a cover member 10 is provided on the front upper portion of the deck member 3.
A hatch cover 11 is attached to the front of the
A steering handle 12 is provided at the rear. Note that 9
Is a ventilation duct for taking air into the engine room 5.

At the rear upper part of the deck member 3, a seat table 1 is provided.
3 is provided, and a straddle-type seat 14 in the front-rear direction is detachably attached to an upper portion of the seat base 13. When the straddle-type seat 14 is removed from the upper surface of the seat base 13, An inspection opening 13a is formed for inspecting the engine 6 in the engine room 5, and an article storage box 15 is provided behind the inspection opening 13a.

An impeller shaft 18 is connected to a crankshaft 16 of the engine 6 via a coupling 17. The impeller shaft 18 has an impeller (not shown) housed in an impeller housing 8 a of the jet propulsion device 8. A jet nozzle 19a is provided at the rear end of the impeller housing 8a, and a deflector 19b is attached to the jet nozzle 19a.

Then, the jet generated by the impeller of the jet propulsion device 8 driven by the engine 6 is injected into an injection nozzle 19a.
The hull 4 is propelled by jetting rearward from the vehicle, and the occupant straddling the straddle type seat 14 is
2 to operate the deflector 19b of the injection nozzle 19a.
Is swung to the left or right to swing.

The engine 6 is a water-cooled in-line four-cylinder 4
As shown in FIG. 5, the engine 6 is mounted on the hull member 2 of the engine room 5 via an engine mount 20 so that the crankshaft 16 extends in the longitudinal direction of the hull. The cylinder block 25 includes a first cylinder, a second cylinder,
A cylinder and a fourth cylinder are provided, respectively. FIG.
, 21 is one of the cylinders, and each cylinder 21 has
A piston 24 connected to the crankshaft 16 via a connecting rod 23 is fitted.

A cylinder head 26 is mounted on the upper part of the cylinder block 25.
The intake port 26a and the exhaust port 26
b is formed and opened and closed by the intake valve 40 and the exhaust valve 41, respectively. These valves 40, 41
Are driven by camshafts 42 and 43, respectively. These camshafts 42 and 43 are covered with a cylinder head cover 44.

As shown in FIGS. 3 to 5, on the starboard side of the cylinder head 26, a first exhaust port 26a connected to each of the exhaust ports 26a of the first cylinder at the foremost position and the fourth cylinder at the last position. One end of a second exhaust manifold 30, which is connected to each of the exhaust ports 26a of the second and third cylinders therebetween, is mounted on the manifold 29. The two exhaust manifolds 29, 30 are on the starboard side from the respective exhaust ports 26a. It extends obliquely downward.

The other end of each of the exhaust manifolds 29 and 30 is connected to one end of a first exhaust pipe 31A, and the first exhaust pipe 31A extends obliquely upward and forward from near one end.

The other end of the first exhaust pipe 31A has a second
One end of the exhaust pipe 31B is connected to the second exhaust pipe 31B.
Similarly to the first exhaust pipe 31A, B is greatly curved while extending obliquely upward and forward, and crosses the front of the engine 6 in the port direction to extend to a substantially middle portion in the width direction.

The outer periphery of the second exhaust pipe 31B is covered with a rubber jacket 31a.
A third exhaust pipe 32 is provided at the other end of the rubber jacket 31a.
One end of the second exhaust pipe 32 is inserted and connected.
The port is extended rearward on the port side of the engine 6 while largely curving in the port direction across the front of the engine 6 from a substantially middle portion in the width direction in front of the engine 6, and the other end is disposed behind the engine 6. The water lock 33 is inserted and connected via a rubber hose 32a.

An intake box 36 is arranged above the cylinder head cover 44 of the cylinder head 26, and a secondary air introduction device (AIS) 37 is arranged in a space below the intake box 36, and an intake box 36 is provided. Is guided to the secondary air introduction device 37 via a pipe, and from the secondary air introduction device 37 to each exhaust passage in the exhaust manifolds 29 and 30 via a hose, so that unburned gas is burned. become.

On the other hand, the rectangular box-shaped intake box 36 is divided into a lower cover 51 and an upper cover 52, as shown in FIGS. 5 and 6, and both are made of plastic. The lower cover 51 and the upper cover 52 include a plurality of flange portions 51d and 52 formed around the outer periphery.
The upper cover 52 is detachably attached to the lower cover 51 by sandwiching d with the clamp metal 53.

The lower cover 51 is provided with bolts 56 on the upper portion of an aluminum alloy stay 55 in which two bracket portions 51e in the front-rear direction on the starboard side of the hull are attached to the cylinder head cover 44 (or the cylinder head 26). Are detachably fixed.

More specifically, as shown in FIG. 7, a through hole 51f is formed in each bracket portion 51e of the lower cover 51, and the through hole 51f is made of a vibration-proof and heat-proof rubber material having an H-shaped cross section. A first elastic sleeve (first elastic member) 47 is fitted and fixed, and a center hole 47a of the first elastic sleeve 47 is fixed.
A metal flanged collar 61 is fitted and fixed from below.

Then, the stay 5 bent outwardly
The lower flange portion 61a of the collar 61 is applied to the upper portion 55a of the collar 5, and the bolt 56 is inserted from above through the center hole 61b of the collar 61 via the washer 62, and the nut 63 welded to the lower surface of the upper portion 55a of the stay 55 is formed. By screwing the bolt 56, the bracket portion 51 of the lower cover 51 is
e is removably fixed to the upper part of the stay 55 of the cylinder head cover 44 by bolts 56. That is,
The intake box 36 is provided with a first elastic sleeve 47 for the engine 6.
Will be mounted via the

An annular filter assembly 54 is disposed inside the intake box 36 on the hull starboard side, and an opening 51a is formed in the lower cover 51 corresponding to the inside of the filter assembly 54. On the upper part of the lower plate 57 that closes the filter 51a, a cylindrical intake port 57a protruding upward to introduce outside air into the filter assembly 54 is provided.
An intake path forming member 60 that forms an intake path together with the intake port 57a is attached to a lower portion of the lower plate 57.

At the bottom of the lower cover 51 on the port side of the hull, four mounting openings 51c are formed along the longitudinal direction of the hull, and these mounting openings 51c are provided with throttles corresponding to the respective cylinders 21 of the engine 6. The bodies 67 are respectively fixed.

More specifically, as shown in FIG. 8, a rubber-like second elastic sleeve (second elastic member) 48 having an H-shaped cross section is fitted into each of the mounting openings 51c and fixed. A metal flanged collar 64 is fitted into the center hole 48a of the second elastic sleeve 48 from below. On the upper surface of the collar 64, a screw hole 64b corresponding to the bolt insertion hole 67a formed in the throttle body 67 is formed.

The upper portion of the third vibration- and heat-proof rubber third elastic sleeve (third elastic member) 49 is fixed by baking over the inner peripheral surface of the center hole 64a of the collar 64, the bottom surface and the outer peripheral surface of the flange portion 64c. The third sleeve 49 has a cylindrical portion 49a extending downward.

The throttle body 67 is applied to the upper surface of the collar 64 from the inside of the lower cover 51, and the bolt 69 is inserted into the bolt insertion hole 67a through the washer 68 from above.
Into the screw holes 64b of the collar 64 and the bolt 69
, The throttle body 67 is detachably fixed to the collar 64 with the bolt 69.
That is, the throttle body 67 is attached to the intake box 36 via the second elastic sleeve 48.

The cylindrical portion 49a of the third elastic sleeve 49
Is inserted and connected to an intake inlet pipe 26 c formed in the cylinder head 26 of the engine 6, and its outer periphery is fastened by a band 65. That is, the throttle body 67 of the intake box 36 is connected to the intake inlet pipe 26c of the engine 6 via the third elastic sleeve 49.

A throttle valve 67b is provided in an intake passage formed in the throttle body 67, a fuel injection valve 80 is provided outside the throttle body 67, and intake air is provided in an upper portion of the intake passage of the throttle body 67. An inlet funnel 67c is inserted and connected and fastened by a ring 67d.

As shown in FIG. 5, the cable 70 for opening and closing the throttle valve 67b is connected to the lower cover 51.
The bottom cover 51 has a drain hole 51g formed at the bottom surface thereof, and a blow-by gas return pipe 88 connected at one end to the cylinder head cover 44. A blow-by gas fitting cylinder portion 51h to which the end is fitted is provided.

The intake port 57a of the intake box 36
The air sucked into the filter assembly 54 from
Throttle body 67 passes through filter assembly 54
Intake funnel 67c to throttle body 67
Intake passage 67f and the intake passage 4 of the third elastic sleeve 49
The air is sucked into the intake inlet pipe 26c of the cylinder head 26 through 9f.

With the above-described structure of mounting the intake box 36, the intake box 36 disposed above the engine 6 has the first elastic sleeve 47 mounted on the upper portion 55a of the stay 55 mounted on the cylinder head cover 44 of the engine 6. Attached with bolts 56 through the fuel injection valve (electrical parts) 8
Throttle body (fuel injection valve attachment part) 6 having 0
7 is attached to the intake box 36 via a second elastic sleeve 48, and an intake passage 67f of the throttle body 67 is provided.
Is connected to the intake inlet pipe 26c of the engine 6 via the intake passage 49f of the third elastic sleeve 49, so that the intake box 36 can be attached to the engine 6 via the elastic sleeves 47 to 49.

The vibration of the engine 6, particularly the cylinder head 26 or the cylinder head cover 44, is caused by the stay 5 for attaching the intake box 36 to the engine 6.
5 or through an intake pipe (a generic name for the third elastic sleeve 49, the throttle body 67, and the intake funnel 67c). In addition,
In the example of FIG. 8, the intake box 36 is connected to the second elastic sleeve 4.
8, the intake box 36 may be attached to the throttle body 67 via the second elastic sleeve 48.

Here, the intake box 36 is connected to the intake pipe (third elastic sleeve 49) via the second elastic sleeve 48.
Further, since the engine 6 is attached to the stay 55 via the first elastic sleeve 47, the vibration of the engine 6 transmitted through the stay 55 or the intake pipe (the third elastic sleeve 49) is reduced by the first elastic sleeve 47 or the second elastic sleeve. It is attenuated by the sleeve 48 and transmitted to the intake box 36.
Therefore, the vibration of the engine 6 is reduced by the hollow intake box 3.
6, and can be prevented from being transmitted to the fuel injection valve 80, which is an electrical component housed in the intake box 36, and the durability of the fuel injection valve 80 is improved.

The heat of the engine 6 is transmitted to the intake box 36 via the stay 55 or the intake pipe (the third elastic sleeve 49). Here, the intake box 36
Since it is attached to the intake pipe (third elastic sleeve 49) via the heat-resistant second elastic sleeve 48 and to the stay 55 via the heat-resistant first elastic sleeve 47, the stay 55 or the intake pipe ( The heat of the engine 6 transmitted to the third elastic sleeve 49) is less likely to be transmitted to the intake box 36. Therefore, since the intake box 36 itself or the air in the intake box 36 can be prevented from being heated, the influence of the heat of the fuel injection valve 80 housed in the intake box 36 can be reduced, and the intake temperature can be suppressed low. Engine performance can be improved. Moreover, since the throttle body 67 to which the fuel injection valve 80 is attached is connected to the engine side (the intake inlet pipe 26c) via the third elastic sleeve 49 made of a vibration-proof and heat-proof rubber material, the engine 6 Can be prevented from being transmitted to the fuel injection valve 80 via the intake pipe (the third elastic sleeve 49), and the fuel injection valve 80 is less affected by the heat and vibration.

Although the above embodiment is an example in which the intake box 36 is arranged above the engine 6, the present invention can also be applied to a type in which the intake box 36 is arranged in front of or on the side of the engine 6.

[0044]

As is apparent from the above description, according to the present invention, the intake box having the electrical components is attached to the engine via the elastic member, so that the vibration and heat of the engine are reduced by the elastic member. And it is difficult to be transmitted to the electrical components through the slab, and the influence on the electrical components is reduced.

According to a second aspect of the present invention, the intake box is disposed above the engine, and the intake box is mounted on the cylinder head cover or the stay mounted on the cylinder head of the engine via the first elastic member. If the box is attached to the intake pipe via the second elastic member, and the fuel injection valve, which is an electrical component, is attached to the intake pipe in the intake box, the vibration of the engine by the first and second elastic members. This makes it difficult for heat or heat to be transmitted to the fuel injection valve via the intake box, thereby reducing the influence on the fuel injection valve, which is an electrical component.

According to a third aspect of the present invention, if the fuel injection valve mounting portion of the intake pipe to which the fuel injection valve is mounted is connected to the intake pipe of the engine through a third elastic member, The three elastic members make it difficult for the vibration and heat of the engine to be transmitted to the fuel injection valve via the intake box, thereby reducing the influence on the fuel injection valve. In addition, since the heat of the engine is less likely to be transmitted to the intake pipe in the intake box by the third elastic member, the air in the intake pipe box is less likely to be heated by the heat of the intake pipe, which is preferable in improving the intake efficiency.

If the elastic member is made of a vibration-proof and heat-proof rubber material, it is preferable from the viewpoint of moldability and cost.

[Brief description of the drawings]

FIG. 1 is a side view of a personal watercraft according to the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a perspective view of the engine viewed obliquely from the front right.

FIG. 4 is a perspective view of the engine as viewed obliquely from the front left.

FIG. 5 is a rear view of a main part of the engine after being broken.

FIG. 6 is a plan view of a lower cover of the intake box.

FIG. 7 is an enlarged sectional view of a stay part of FIG. 5;

FIG. 8 is an enlarged sectional view of a throttle body portion of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Personal watercraft 6 Engine 26 Cylinder head 26c Intake inlet pipe 36 Intake box 44 Cylinder head cover 47 First elastic sleeve 48 Second elastic sleeve 49 Third elastic sleeve 55 Stay 56 Bolt 67 Throttle body 80 Fuel injection valve (Electric component)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F02M 35/10 301N 301T

Claims (4)

[Claims] 1. An engine mounted on a small boat, wherein an intake box having electrical components is disposed near the engine, and the intake box is attached to the engine via an elastic member. Box mounting structure for small marine engines. 2. The intake box is disposed above the engine, a stay is attached to a cylinder head cover or a cylinder head of the engine, and the intake box is attached to an upper portion of the stay via a first elastic member. 2. The engine for a small boat engine according to claim 1, wherein said intake box is attached to an intake pipe via a second elastic member, and a fuel injection valve which is an electrical component is attached to the intake pipe in said intake box. Intake box mounting structure. 3. The small boat according to claim 2, wherein a portion of the intake pipe to which the fuel injector is attached is connected to an intake pipe of the engine via a third elastic member. Mounting structure for engine intake box. 4. The structure for mounting an intake box for a small boat engine according to claim 1, wherein the elastic member is a vibration-proof and heat-proof rubber material.