JP2000145472A - Small ship - Google Patents

Abstract

PROBLEM TO BE SOLVED: To locate a fuel pump without increasing the overall length of an engine. SOLUTION: A drive pulley 51 mounted on an extended distal end 39a extending forwardly from a crank shaft 37 of an engine 21 is connected to a driven pulley 52 mounted on the front end of the engine 21 by an endless belt 53. A fuel pump 32 is mounted on a fuel pump shaft 57a extending rearward from the driven pulley 52. The fuel pump 32 is driven by way of the extended distal end on the crank shaft 37 of the engine 21, the drive pulley 51, the endless belt 53, the driven pulley 52 and the fuel pump shaft 57a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a small boat.

[0002]

2. Description of the Related Art Conventionally, a small boat, for example, a jet propulsion boat is configured to propel a hull by driving a jet propulsion machine with an engine housed in an engine room in the boat.

In a jet propulsion boat as described above,
Conventionally, as a method of supplying fuel to the engine, a method of supplying fuel from a carburetor into an intake passage has been adopted, but in recent years, a method of directly injecting fuel into a cylinder from a fuel injection valve (injector) has been adopted.

[0004]

By the way, as a driving system of the fuel pump used in the above-described fuel supply system,
Some use the output of the engine crankshaft,
There was still room for improvement regarding the layout of the fuel pumps, etc.

[0005] The present invention has been made to solve the conventional problems, and has as its object to provide a small boat in which a fuel pump can be arranged without increasing the overall length of an engine. is there.

[0006]

In order to solve the above problems, the present invention relates to a small boat equipped with an engine,
A driving pulley is provided at a protruding end protruding forward from above the crankshaft of the engine, and a driven pulley driven by the driving pulley via an endless transmission band is provided on the front side of the engine. A small boat is provided, wherein a fuel pump is provided on a fuel pump shaft extending rearward from a driven pulley.

According to the present invention, the drive pulley provided at the protruding end protruding forward from above the crankshaft of the engine and the driven pulley provided at the front side of the engine are connected via the endless transmission band. By providing the fuel pump on the fuel pump shaft extending rearward from the driven pulley, the protruding end on the crankshaft of the engine is driven through the driving pulley, the endless transmission band, the driven pulley, and the fuel pump shaft. The fuel pump can be driven.

Further, by providing the fuel pump on the fuel pump shaft extending rearward from the driven pulley, the fuel pump can be disposed in a dead space between the rear side of the endless transmission band and the front side of the engine. The overall length of the engine can be shortened as compared with the case where a fuel pump is arranged on the front side of the band, and the engine can be made more compact.

The term "on the crankshaft or on the fuel pump shaft" refers to an extended end of the crankshaft or an extended end of the fuel pump shaft, or a component attached to the crankshaft or a component attached to the fuel pump shaft. good.

When a flywheel magnet is provided at the front of the crankshaft, it is preferable that the drive pulley is provided at a front side of the flywheel magnet. That is, if the drive pulley is provided on the rear side of the flywheel magnet, the flywheel magnet is moved to the front by that much, so that the vibration of the flywheel magnet increases.

If the endless transmission band and the respective pulleys are covered with a cover as in claim 2, water is not applied to the endless transmission band and the respective pulleys, so that corrosion and the like hardly occur. .

If the fuel pump is supported by the cover, the accuracy of the mounting position of the fuel pump with respect to the fuel pump shaft of the driven pulley in the cover is improved.

If the cover is fixed to the front end face of the crankcase of the engine, the cover can be shared with the flywheel magnet cover, and the number of parts can be reduced. Cost can be reduced.

If the engine mount bracket is provided integrally with the cover, the number of parts can be reduced and the cost can be reduced.

According to a sixth aspect of the present invention, at least a part of the driving pulley and the driven pulley is covered with an exhaust pipe of the engine, the type having the cover as described above is provided. In addition, since the cover itself and the seal at the joint surface of the cover are not covered with water, it is difficult for water to enter the inside of the cover, and corrosion and the like hardly occur in the endless transmission band and each pulley in the cover.

According to a seventh aspect of the present invention, when the fuel pump is arranged between an exhaust manifold connected to one side of the engine and a driven pulley, the fuel pump is disposed between the exhaust manifold and the driven pulley. The fuel pump can be rationally arranged in the dead space between them, so that the overall length of the engine can be shortened and the engine can be made more compact.

[0017]

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

As shown in FIG. 1, in a jet propulsion boat which is a small boat, a hull 10 has a hull member 11 and a deck member 12.
It is composed of A steering handle 13 is provided above the deck member 12, and above the deck member 12 behind the steering handle 13,
A seat base 14 rising upward from the front is provided to extend rearward, and on the upper surface of the seat base 14, a long detachable seat 15 for two people is placed rearward.
With the attachment and detachment of 5, the inspection opening formed on the upper surface of the seat table 14 can be opened and closed. In addition, sheet 1
5 may be an openable / closable type using a hinge or the like.

Steps 17 are formed on both sides of the seat 14 of the deck member 12 between the deck member 12 and the bulwark 16 projecting upward from both sides of the deck member 12 for the rider to put both feet on. ing. Further, a bow hatch 19 is provided at the front of the deck member 12 so as to be able to open and close a storage recessed at the front of the deck member 12.

The interior space of the hull 10 is the bulkhead 1
8, an engine room 20 is formed in a space in front of the bulkhead 18. The engine room 20 is located at a position below the seat table 14 for two cycles (or 4 cycles).
Cycle) type three-cylinder engine 21 has engine mounts 22 (A, B) at front, rear, left and right with respect to hull member 11.
A fuel tank 23 made of resin is fixed to the hull member 11 at a position in front of the engine 21. Reference numeral 9 denotes a starter motor.

A jet propulsion device 27 is disposed in a pump chamber formed at a lower rear portion of the hull member 11 of the hull 10. The jet propulsion device 27 is driven by the engine 21 via an impeller shaft. Is rotated, water is sucked from the water suction port at the bottom of the ship, and the water is jetted rearward from the nozzle 27c of the jet propulsion device 27, whereby the hull 10 is propelled. Further, the hull 10 is turned by swinging the nozzle 27c left and right by operating the steering handle 13.

The cylinder block 21 of the engine 21
The intake box (intake silencer) 42 (see FIG.
On the port side of the cylinder block 21a of the engine 21, an exhaust manifold 43 for connecting exhaust pipes derived from the respective cylinders into one is connected, and an exhaust pipe 44 is connected to the exhaust manifold 43. The exhaust pipe 44 bypasses the front upper portion of the engine 21 in a U-shape, extends rearward above the starboard side of the engine 21, and extends downward at the rear side of the engine 21. After bending, it extends rearward again (see FIGS. 4 and 5), penetrates the bulkhead 18, and is disposed on the port side in the rear chamber 41, which is the space behind the bulkhead 18. A downstream end is connected to an inlet of the lock (exhaust silencer) 45. The upstream end of a discharge pipe 46 is connected to the outlet of the water lock 45.
After extending to the starboard side bypassing the upper part of the pump chamber of the hull member 11, the downstream end is connected to the right side wall of the pump chamber, and exhaust gas is discharged into the pump chamber. A battery 49 is disposed in the rear chamber 41.

On the inner surface of the hull member 11 located on the port side of the fuel tank 23, a vapor separator (fuel pool) 30 is supported via an elastic member 28 (see FIG. 3). , Fuel tank 2
3 through a fuel hose 29a.
A low-pressure fuel pump for supplying the fuel supplied into the fuel tank 0 to the high-pressure fuel pump 32 through the fuel hose 29b is accommodated. A diaphragm pump (driven by a negative pressure of a crank chamber) for feeding the fuel in the fuel tank 23 to the vapor separator 30 and a manual pump (for the first time after the engine 21 is overhauled, etc.) are applied to the fuel hose 29a. When the vapor separator 3
(Used to fill the inside of the fuel tank with fuel). The mounting structure of the high-pressure fuel pump 32 will be described later in detail.

The vapor separator 30 has a vapor return hose 3 for returning vapor to the fuel tank 32.
0a is provided. The fuel tank 23 is provided with a vapor escape hose for allowing the vapor to escape outside the boat, and a fuel hose 23 for replenishing the fuel.
a is provided.

The fuel hose 29 of the high-pressure fuel pump 32
As shown in FIGS. 2 and 5, the fuel delivered from the cylinder c is sent to the fuel rail 33 above the fuel injection valve (injector) 34 of each cylinder attached to the cylinder head 21c of the engine 21. The fuel is distributed from the fuel rail 33 to each of the fuel injection valves 34 and is directly injected into each of the cylinders. An ignition plug 35 for igniting the fuel injected into the cylinder is attached to the cylinder head 21c corresponding to each fuel injection valve 34.

On the other hand, as shown in FIG.
Crankcase 2 below the first cylinder block 21a
Inside 1d, a crankshaft 37 is disposed in the front-rear direction, and is rotatably supported by a plurality of bearings 38.
A boss 39 a of a flywheel magnet 39 is fixed to a front end of the crankshaft 37 with a bolt 40.

The above aluminum alloy crankcase 21d
A cover body 50 made of an aluminum alloy is fixed to the front end opening 21e of the cover body 50. The round hole 50a of the cover body 50
The front half of the flywheel magnet 39 whose rear half is covered by the crankcase 21d is covered.

A drive pulley 51 is fixed to a boss 39a of the flywheel magnet 39 which is a protruding end protruding forward from above the crankshaft 37, and the drive pulley 51 is provided with a round hole 50a of the cover body 50. Housed within.

In the front surface of the cover main body 50, a bottomed cylindrical protrusion 50b is formed which is connected to the round hole 50a and projects obliquely upward to the right as viewed in the front view of FIG. A driven pulley 52 having a larger diameter than the driving pulley 51 is disposed at a center position of the front recess 50c.

An endless transmission belt (endless chain or endless belt) 53 is wrapped around the driving pulley 51 and the driven pulley 52, so that the driving pulley 51 is rotated by the crankshaft 37, The driven pulley 52 is rotated via the endless transmission band 53.

A tension roller 54 is urged by a spring 55 in the front concave portion 50c of the cover body 50 between the driving pulley 51 and the driven pulley 52. Gives tension.

A cam mechanism unit 57 previously assembled to the high-pressure fuel pump 32 with bolts or the like is externally attached with bolts or the like to the rear surface of the projecting portion 50b of the cover main body 50. The input shaft 57a of the cam mechanism unit 57 is The driven pulley 52 is supported on the input shaft 57 a of the cam mechanism unit 57 by penetrating the serration at the tip from the outside rear through the center hole 50 d of the protruding portion 50 b and coupling the serration to the serration center hole of the driven pulley 52. Become so.
The high-pressure fuel pump 32 may be directly supported by the cover body 50.

In the cam mechanism unit 57, a cam is provided on an output shaft 57b interconnected by a gear 57c intersecting at right angles with the input shaft 57a. The cam reciprocates the plunger of the high-pressure fuel pump 32 with the cam. By being moved, the fuel that has entered from the inlet 32a of the high-pressure fuel pump 32 at a low pressure is sent out from the outlet 32b at a high pressure. Since the internal structures of the cam mechanism unit 57, the high-pressure fuel pump 32, and the like are known, further description is omitted.

The high-pressure fuel pump 32 to which the cam mechanism unit 57 is assembled is connected to the inlet 32 as viewed from the front in FIG.
a and the outlet 32b are externally attached to the rear surface of the cover body 50 so as to face right above, but as shown by the two-dot chain line a in FIG. 3, the inlet 32a and the outlet 32b face right beside (starboard side). The cover body 50 may be externally attached to the rear surface.

A cover 50A is provided to cover the front recess 50c of the protrusion 50b of the cover body 50 and the front opening of the round hole 50a in a watertight manner. The cover 50A is fixed to the cover body 50 by bolts or the like.

The engine mount 22A on the front side is integrally provided on the lower left and right sides of the cover body 50. 4 and 5, the upper part of the cover body 50 located above the driving pulley 51 and the driven pulley 52 is covered with the exhaust pipe 44 of the engine 21. Further, the high-pressure fuel pump 32 is disposed between the exhaust manifold 43 on the port side of the cylinder block 21a of the engine 21 and the driven pulley 52.

An oil pump 60 is fixed to the front surface of the cover 50A so that the oil drive shaft coincides with the axis of the crankshaft 37, as shown by a two-dot chain line b in FIG. Is further extended, and the extended end is connected to an oil drive shaft by serration or the like, so that the oil pump 60 is driven by the crankshaft 37 to fix the oil tank 24 fixed on the upper surface of the fuel tank 23.
1 (see FIG. 1) is supplied to each engine of the engine 21.

As shown by a solid line in FIG. 3, an oil pump 60 is fixed to the front surface of the cover 50A so that the oil drive shaft coincides with the axis of the input shaft 57a of the cam mechanism unit 57. The oil pump 60 may be driven by the input shaft 57a of the cam mechanism unit 57 by further extending the front end of the input shaft 57a and connecting the extended end to the oil drive shaft by serration or the like.

With this oil pump driving system, the rotation of the crankshaft 37 between the driving pulley 51 and the driven pulley 52 is reduced as compared with the system in which the oil pump 60 is directly driven by the crankshaft 37. The vibration of the crankshaft 37 is less likely to be transmitted to the oil pump 60 due to the fact that the endless transmission band 53 serves as a cushion.
In addition, since the fixed position of the oil pump is increased, water that has accumulated in the hull and bounces off is less likely to be applied to the oil pump 60.

As shown in FIG. 7, a plurality of rotation speed detection sensors 65 are provided in the crankcase 21d around the flywheel magnet 39 of the crankshaft 37, and the rotation of the flywheel magnet 39 is controlled by the rotation speed. The detection by the detection sensor 65 allows the engine 21
As shown schematically in FIG. 6, as shown schematically in FIG. 6, the protrusion 50 b on the outer periphery of the driven pulley 52 of the input shaft 57 a of the cam mechanism unit 57 in the cover body 50 is provided.
A plurality of rotation speed detection sensors 65 are provided in the front recess 50c.
Is provided, and the rotation of the driven pulley 52 is detected by the rotation speed detection sensor 65, whereby the rotation speed signal of the engine 21 can be obtained.

With this detection method, the rotation of the crankshaft 37 between the driving pulley 51 and the driven pulley 52 is reduced as compared with the detection method using the flywheel magnet 39 of the crankshaft 37. And endless transmission belt 53
The vibration of the crankshaft 37 is less likely to be transmitted to the driven pulley 52 and the rotation speed detection sensor 65, for example, as a cushion, so that the detection accuracy is improved.

With the above configuration, the flywheel magnet 3 fixed to the crankshaft 37 of the engine 21
9, a small-diameter drive pulley 51 supported on the boss portion 39a of
The driven pulley 52 supported on the input shaft 57a of the cam mechanism unit 57 of the high-pressure fuel pump 32 externally attached to the cover body 50 located on the front side of the engine 21 is connected via an endless transmission band 53 to this cover. An input shaft 57a and an output shaft 57 which are fuel pump shafts extending rearward from the drive pulley 52.
b, the high-pressure fuel pump 32 is provided via
The high-pressure fuel pump 32 can be driven from the crankshaft 37 of the engine 21 via the driving pulley 51, the endless transmission band 53, the driven pulley 52, the input shaft 57a, and the output shaft 57b.

Further, the high pressure fuel pump 32 is provided on the input shaft 57a and the output shaft 57b (fuel pump shaft) extending rearward from the driven pulley 52, so that the rear side of the endless transmission band 53 and the front side of the engine 21 are provided. , The high-pressure fuel pump 32 can be arranged in the dead space, so that the overall length of the engine 21 can be shortened as compared with the case where the high-pressure fuel pump 32 is arranged in front of the endless transmission band 53, and the engine 21 can be made compact. .

Further, since the endless transmission band 53, the driving pulley 51 and the driven pulley 52 are covered with the cover body 50 and the cover 50A, the endless transmission band 53 and the respective pulleys 51 and 52 are not covered with water. , Corrosion and the like hardly occur.

Furthermore, the cam mechanism unit 57, which is the rear part of the high-pressure fuel pump 32, is fixedly supported on the cover body 50, and the driven pulley 52 is supported by the input shaft 57a of the cam mechanism unit 57. Cover body 50
, Driven pulley 52, input shaft 57 a and output shaft 57
The mounting position accuracy of the high-pressure fuel pump 32 with respect to b is improved.

The cover main body 50 is mounted on the engine 2.
Because it is fixed to the front end opening of the first crankcase 21d, it can be shared with the flywheel magnet cover,
The number of parts can be reduced and cost can be reduced. Further, since the front engine mount 22 (A) is provided integrally with the cover main body 50, the number of parts can be reduced and cost can be reduced.

Since the upper part of the driving pulley 51 and the driven pulley 52 is covered by the exhaust pipe 44 of the engine 21, the cover body 50 and the cover 5 are provided as in the present embodiment.
Even if the cover body 50A is provided, water is not applied to the seal between the cover body 50 and the cover 50A itself and the mating surface between the cover body 50 and the cover 50A. Endless transmission belt 5 in body 50
3 and the pulleys 51 and 52 are less likely to corrode.

Further, since the high-pressure fuel pump 32 is disposed between the exhaust manifold 43 on the port side of the engine 21 and the driven pulley 52, the exhaust manifold 43 and the large-diameter driven pulley 52 are disposed. , The high-pressure fuel pump 32 can be rationally arranged in the dead space, so that the overall length of the engine 21 can be shortened, and the engine 21 can be made more compact.

On the other hand, as shown in FIG. 1, cooling water supply pipes 70a, 70a for supplying cooling water from the pump chamber of the jet propulsion device 27 to the cooling water jackets of the cylinder block 21a of the engine 21 and the exhaust manifold 43. 70b
Are connected to each other, and cooling water discharge pipes 71a and 71b for discharging each cooling water from the cooling water jackets of the cylinder head 21c and the exhaust pipe 44 to the discharge pipe 46 are respectively connected. A thermostat is provided at the outlet of the cooling water jacket of the cylinder head 21c. The thermostat maintains the temperature of the cooling water of the cylinder block 21a and the cylinder head 21c at a constant level, and controls the temperature of the fuel injected from the fuel injection valve 34. This is for making the atomization uniform.

The ECU (Electric Control System) for controlling the fuel injection system is provided on the front surface of the bulkhead 18.
Unit) 47, and an ignition system control E is provided above the bulkhead 18 on the engine room 20 side.
A CU 48 is arranged, and these control ECUs 47, 4
8 is preferably cooled because the temperature of the electronic component 50 is increased by the heat generated by the electronic component 50.

Therefore, as shown in FIGS. 8A and 8B,
The control ECUs 47 and 48 are formed in a double box shape, the electronic components 50 are housed in the front recesses 47a and 48a, closed by the front covers 47b and 48b, and the rear recess 47 is formed.
c, 48c are used as cooling water jackets and rear lids 47d, 48c.
Close watertight with d.

Then, from the pump chamber of the jet propulsion device 27, the concave portions 47c,
A cooling water supply pipe 70c for supplying cooling water from below is connected to the cooling water jacket 48c (cooling water jacket), and cooling water is discharged from the upper part of each of the recesses 47c and 48c (cooling water jacket) to the discharge pipe 46. Each of the control ECUs 47 and 4 is connected by connecting the water discharge pipe 71c.
8 can be cooled with cooling water.

It is preferable that the vapor separator 30 on the inner surface of the hull member 11 is cooled because bubbles are generated in the fuel when the temperature becomes high due to the heat generated by the engine 21.

Therefore, although not specifically shown, a cooling water jacket is also formed on the vapor separator 30, and a cooling water supply pipe 70d for supplying cooling water from above to the cooling water jacket from the exhaust manifold 43 is connected to each. At the same time, the discharge pipe 46
By connecting the cooling water discharge pipe 71d for discharging the cooling water to the vapor separator 30, the vapor separator 30 can be cooled by the cooling water. It is also possible to connect a pilot water discharge pipe 70e instead of the cooling water discharge pipe 71d, and discharge the cooling water as pilot water outside the boat.

[0055]

As is clear from the above description, the small boat of the present invention has a drive pulley provided at a protruding end projecting forward from above the crankshaft of the engine, and a cover provided at the front side of the engine. The drive pulley is connected to the drive pulley via an endless transmission band, and the fuel pump is provided on a fuel pump shaft extending rearward from the driven pulley. The fuel pump can be driven via the belt, the driven pulley, and the fuel pump shaft.

Further, by providing the fuel pump on the fuel pump shaft extending rearward from the driven pulley, the fuel pump can be arranged in a dead space between the rear side of the endless transmission band and the front side of the engine. The overall length of the engine can be shortened as compared with the case where a fuel pump is arranged on the front side of the band, and the engine can be made more compact.

If the endless transmission band and each pulley are covered with a cover as in claim 2, water is not applied to the endless transmission band and each pulley, so that corrosion and the like hardly occur.

If the rear part of the fuel pump is supported by the cover, the accuracy of the mounting position of the fuel pump with respect to the fuel pump shaft of the driven pulley in the cover is improved.

If the cover is fixed to the front end face of the crankcase of the engine, the cover can be shared with the flywheel magnet cover, and the number of parts can be reduced. Cost reduction can be achieved.

According to a fifth aspect of the present invention, when the engine mount bracket is provided integrally with the cover,
The number of parts can be reduced and cost can be reduced.

If the drive pulley and the driven pulley are covered with the exhaust pipe of the engine, the cover itself and the driven pulley can be used. Water will not be applied to the seal at the cover mating surface, so it is difficult for water to enter the inside of the cover,
Corrosion and the like hardly occur in the endless transmission band and each pulley in the cover.

If the fuel pump is arranged between the exhaust manifold connected to one side of the engine and the driven pulley, the fuel pump can be connected between the exhaust manifold and the driven pulley. Since the fuel pump can be rationally arranged in the dead space between the two, the overall length of the engine can be shortened, and the engine can be made more compact.

[Brief description of the drawings]

FIG. 1 is a perspective view of a jet propulsion boat.

FIG. 2 is an exploded perspective view of the engine.

FIG. 3 is a front view of the engine.

FIG. 4 is a plan view of the engine.

FIG. 5 is a side view of the engine.

FIG. 6 is a front view showing a mounting position of a high-pressure fuel pump and the like with respect to a cover main body.

FIG. 7 is a front view showing an arrangement of a rotation speed detection sensor with respect to a flywheel magnet of a crankshaft.

FIG. 8A is an exploded perspective view of a control ECU, and FIG.
FIG. 2 is a schematic sectional view of a control ECU.

[Explanation of symbols]

 Reference Signs List 10 hull 21 engine 21d crankcase 32 high-pressure fuel pump 37 crankshaft 39a boss (projecting end) 51 drive pulley 52 driven pulley 53 endless transmission band 57 cam mechanism unit 57a input shaft (fuel pump shaft) 50 cover body 50A cover

Claims (7)

[Claims] 1. A small boat equipped with an engine, wherein a drive pulley is provided at a protruding end portion of the engine protruding forward from above a crankshaft, and a driving pulley is provided on the front side of the engine via an endless transmission band. A small boat comprising: a driven pulley driven by the driving pulley; and a fuel pump provided on a fuel pump shaft extending rearward from the driven pulley. 2. The small boat according to claim 1, wherein the endless transmission band and each pulley are covered with a cover. 3. The small boat according to claim 2, wherein the fuel pump is supported by the cover. 4. The engine according to claim 2, wherein the cover is fixed to a front end surface of a crankcase of the engine.
A small vessel as described in. 5. The small boat according to claim 2, wherein an engine mount bracket is provided integrally with the cover. 6. The small boat according to claim 1, wherein an upper part of at least a part of the driven pulley and the driven pulley is covered with an exhaust pipe of the engine. 7. The small boat according to claim 1, wherein the fuel pump is disposed between an exhaust manifold connected to one side of the engine and a driven pulley.