JPH0893495A - Fuel feeding device of outboard engine - Google Patents

Abstract

PURPOSE: To miniaturize the whole outboard engine, and to reduce the cost of parts. CONSTITUTION: In constituting a fuel feeding device 30 of an outboard engine where the fuel from a fuel tank loaded on a boat side is stored in a vapor separator 34 loaded on the outboard engine side, and the fuel in the vapor separator 34 is fed to an engine 1 by a fuel pump, the vapor separator 34 is arranged on one side of the engine 1, and is made of the upper and lower split structure of an upper side case 34b and a lower side case 34a. A fuel feeding passage 37a from the fuel tank side, the fuel feeding passage 37b to the engine, and a fuel return passage 37c from the engine side are connected to the upper side case 34b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outboard motor fuel supply apparatus for supplying fuel from a fuel tank on the hull side to a vapor separator on the outboard motor side.

[0002]

2. Description of the Related Art Generally, when supplying fuel to an outboard engine, a fuel tank is arranged on the hull side, and a vapor separator, a low pressure fuel pump, a high pressure fuel pump, etc. are arranged on the outboard motor side. ing. Then, the fuel in the fuel tank is pumped up by a low-pressure fuel pump and stored in the vapor separator, and the fuel in the vapor separator is supplied at high pressure to the fuel supply rail attached to the fuel injection valve by the high-pressure fuel pump, The return fuel from the fuel supply rail is returned to the vapor separator. Therefore, many paths such as a fuel supply passage from the fuel tank side, a fuel supply passage to the fuel supply rail, and a fuel return passage from the fuel supply rail are connected to the vapor separator.

[0003]

By the way, when the fuel supply device for an outboard motor is adopted, the layout of the fuel supply parts should be as compact as possible in view of its application, and the parts cost should be reduced as much as possible. Has been requested. However, the above vapor separator,
Depending on the arrangement structure of the passages connected to it, the hose or the like may be complicatedly arranged, the arrangement space may be increased, and the component cost may be increased. There is concern that it may not be possible to cope with cost reduction.

The present invention has been made in view of the above circumstances, and can reduce the space for arranging the vapor separator and the like, suppress the increase in the cost of parts, and further reduce the size and cost of the fuel for the outboard motor. The purpose is to provide a supply device.

[0005]

According to a first aspect of the present invention, fuel from a fuel tank mounted on the hull side is stored in a vapor separator mounted on the outboard motor side, and the fuel in the vapor separator is stored as fuel. In a fuel supply device for an outboard motor configured to supply to an engine by a pump, the vapor separator has an upper case and a lower case divided into upper and lower parts, and a fuel supply passage from the fuel tank side is provided in the upper case. The fuel supply passage to the engine and the fuel return passage from the engine side are connected.

According to a second aspect of the present invention, the fuel in the vapor separator similar to the first aspect is supplied to the fuel supply rail mounted on the fuel injection valve of the engine by the fuel pump. In the above, the vapor separator is arranged on one side of the engine and the fuel supply rail is arranged on the other side of the engine.

According to a third aspect of the present invention, the engine is a vertical engine in which the crankshaft is vertically arranged, and the fuel supply rail is vertically arranged in the same direction as the crankshaft. Is connected to a lower end portion of the fuel supply rail, and a fuel return passage from the fuel supply rail is connected to an upper end portion of the fuel supply rail.

[0008]

According to the invention of claim 1, the vapor separator is divided into an upper case and a lower case, and three supply passages, supply passages, and return passages are connected to the upper case. The installation space can be reduced and the installation route can be simplified, and the entire outboard motor can be made compact. Further, since all the passages are connected to the upper case, it is only necessary to process the connection port on the upper case, which is easier than the case of processing the connection ports on both cases, and eventually the cost of parts is reduced. it can.

According to the second aspect of the invention, since the vapor separator is arranged on one side of the engine and the fuel supply rail is arranged on the other side of the engine, the space around the engine is effectively utilized to balance the vapor separator and the fuel supply rail. It is possible to arrange well, it is easy to secure a space for disposing a relatively large component, and it is possible to achieve compactness.

According to the third aspect of the present invention, the vapor separator is vertically arranged on one side of the engine and the fuel supply rail is vertically arranged on the other side of the engine, and the fuel from the vapor separator is introduced from the lower end portion of the fuel supply rail and the upper end thereof. Since it was returned from the section, the fuel return passage will be located at the highest position,
The air in the fuel is accumulated in the return passage, so that the air can be easily evacuated, and the air is not accumulated in the fuel supply rail, so that the fuel is reliably injected and supplied. Incidentally, when the fuel supply rail is laterally positioned, there arises a problem that the air inside the fuel cannot be sufficiently removed depending on the height position.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 8 are views for explaining a fuel supply system for an outboard motor two-cycle engine according to an embodiment of the present invention. FIG. 1 is a front view of the fuel supply system according to the present embodiment, and FIG. FIG. 3 is a right side view of the above-mentioned embodiment apparatus, FIG. 4 is a cross-sectional view of a vapor separator, and FIG. 5 is a schematic view of an outboard motor two-cycle engine to which the above-mentioned embodiment apparatus is applied. 6 is a sectional view taken along line VI-VI in FIG. 7, FIG. 7 is a sectional view taken along line VII-VII in FIG. 8, and FIG. 8 is a schematic configuration diagram of the engine. In the figure, F indicates the bow side, R indicates the stern side, and left and right indicate the left and right when the stern side is viewed from the bow side.

As shown in the lower part of FIG. 5, the outboard motor 50 of this embodiment has an upper case 53 connected to an upper part of a lower case 52 in which a propulsion device 51 is arranged, and an upper case 53 is connected to an upper part of the lower case. A top cowl 54 accommodating the engine 1 is connected to the outboard motor 50, and the outboard motor 50 is pivotally supported at the stern of a hull (not shown) so as to be swingable.

The engine 1 is a V-type 6-cylinder two-cycle engine in which a crankshaft 5 thereof is vertically arranged so as to be substantially vertical during traveling. This is a cylinder block 2.
Cylinder bores 2 formed to form left and right V banks
A piston 3 is slidably inserted and disposed in a, and the piston 3 is connected to a crank pin 5a of a crank shaft 5 by a connecting rod 4. Further, a combustion concave portion 6a which forms a combustion chamber with the head surface of the piston 3 is formed on the inner surface of the cylinder head 6 mounted on the mating surface of the cylinder block 2, and the ignition plug 7 is formed in the concave portion 6a. Has been inserted.

The crank pin 5a portion of the crank shaft 5 is formed independently for each cylinder, and the left and right crank chambers 8 are formed.
a, 8b, and the crank chambers 8a, 8b
Can communicate with each of the cylinder bores 2a through a scavenging passage 9 formed in the cylinder wall. Further, each intake passage 2 communicating with the upstream end opening of each crank chamber 8a, 8b.
Reed valves 10 and 10 are arranged in a horizontal position in each case 8.

Each of the reed valves 10 is constructed such that a vent hole 10c is formed in a slope portion of a valve body 10a having a triangular cross section, and the vent hole 10c is opened and closed by a pair of valve plates 10b. In addition, the base portion (flange portion) of the valve body 10a of each reed valve 10 is a holding plate 1
5 and the holding plate 15 is fixed to the crank chamber opening end surface.

An intake manifold 11 common to all cylinders is connected and fixed to the upstream end surface of the holding plate 15 together with the holding plate 15, and the intake manifold 11 has the crank chambers 8a and 8b.
Branch passages 11a and 11b are formed to communicate with each other. Further, the intake manifold 11 faces the merging portions 11c of the branch passages 11a and 11b, respectively.
A pair of throttle bodies 12 are connected to each other, and an upstream end opening of each throttle body 12 communicates with a silencer 13 having a hollow box shape common to each cylinder.

Each of the throttle bodies 12 has an intake passage 12a communicating with the merging portion 11c, and a throttle valve 18 for variably controlling the opening area of the passage 12a is arranged near the upstream end of the intake passage 12a. It is set up.
A valve shaft 19 of the throttle valve 18 projects through the throttle body 12 in a direction perpendicular to the crankshaft, and a leftward protruding portion of the valve shaft 19 returns the throttle valve 18 to a fully closed position. A spring 22 is attached. On the left side of each throttle body 12, there is provided a link mechanism 23 that connects the end portions of the respective valve shafts 19 on the return spring 22 side.

The right side wall 12 of each throttle body 12
A pair of injectors 16 and 16 for injecting fuel toward the reed valves 10 and 10 disposed at the inlets of the cylinder crank chambers 8a and 8b are mounted on e. In addition, the injection nozzle 16a of each injector 16 described above.
Is located downstream of the throttle valve 18.

A rail support boss portion 1 extending obliquely outward is provided at the injector mounting portion of each throttle body 12.
2b is integrally formed. An injector rail 17 is laid across the outer end surface 12d of each support boss 12b, and the injector rail 17 is mounted on the bolt 1
It is fastened and fixed to each of the support bosses 12b by 7a. The injector rail 17 is the engine 1
Is arranged on the right side of the injector rail 17 and substantially parallel to the crankshaft 5, and the fuel inlet 16b of each injector 16 is inserted into the fuel passage 17b of the injector rail 17.

The throttle bodies 12 are positioned and fixed by a fixing plate 24 that connects the throttle bodies 12 to each other. This is one in which a fixing plate 24 is fitted to a positioning pin 12c protrudingly formed on each throttle body 12 and positioned, and then bolted and fixed, and in this state, the injector rail 17 is attached. As a result, a single assembly component is formed by integrally assembling each throttle body 12, injector 16, and injector rail 17.

The engine 1 is provided with a fuel supply device 30 of this embodiment. As shown in the upper part of FIG. 5, the fuel supply device 30 mainly includes a fuel tank 31 mounted on the hull side and a fuel supply system 32 mounted on the outboard motor 50 side. This fuel supply system 32
Is a low-pressure diaphragm pump 33a for supplying the fuel sucked from the fuel tank 31 into the vapor separator 34 through the water separation filter 33b, and the fuel sucked from the vapor separator 34 to the fuel filter 3
A high pressure type electromagnetic pump 35 for supplying a high pressure to the injector rail 17 via the control unit 6 is provided.

Numeral 55 is a vapor discharge passage for sucking vapor containing vaporized fuel in the vapor separator 34 into the intake system, 56 is a canister for separating gaseous fuel in the vapor, 57 is intake air from the intake system, etc. It is a check valve for preventing reverse flow to the vapor separator 38 side.

The diaphragm pump 33a is arranged on the right side of the injector rail 17, and the water separation filter 33b is arranged behind the diaphragm pump 33a (see FIG. 2). The vapor separator 34 is arranged on the left side of the engine 1 opposite to the injector rail 17, and the separator 3
4 is attached to the engine 1 through a flange portion 34c integrally formed with the engine 4. Further, the fuel filter 36 is arranged below the vapor separator 34.

As shown in FIG. 4, the high-pressure electromagnetic pump 35 is housed and arranged in the vapor separator 34 on the stern side, and the bow side in the vapor separator 34 serves as a fuel reservoir. A float 38 is swingably arranged in the fuel storage portion. The float 38 swings to the solid line side in the drawing when the liquid level of the fuel in the reservoir increases, and closes the fuel supply port 37a described later by the needle valve 38a, and when the liquid level falls, swings to the two-dot chain line side in the drawing to open, This keeps the amount of fuel in the vapor separator 34 constant. Here, since the electromagnetic pump 35 is arranged on the stern side of the vapor separator 34 and the float 38 is arranged on the fuel storage section on the bow side, if the liquid level fluctuates as shown by the alternate long and short dash line in FIG. Does not overflow because it rotates to the position shown by the solid line to close the fuel supply port 37a.

The vapor separator 34 has a two-part structure in which the upper case 34b is bolted and fixed to the upper surface opening of the lower case 34a. The upper wall of the upper case 34b has a fuel supply port 37a and a fuel supply port 37a. The port 37b and the fuel return port 37c are connected to each other. The discharge port 35a of the electromagnetic pump 35 is connected to the fuel supply port 37b. The bottom wall of the lower case 34a is inclined toward the electromagnetic pump 35 side, and the filter 39 is arranged along the inclined surface. This filter 3
The suction port 35b of the electromagnetic pump 35 is connected to the lower end of 9. This prevents air from being sucked in due to fluctuations in the liquid level, and allows fuel to be sucked in to the end even when gas is exhausted.

A refill hose 40 is provided at the fuel refill port 37a.
The supply hose 40 is connected to the discharge port of the diaphragm pump 33a passing above the uppermost throttle body 12. A supply hose 41 is connected to the fuel supply port 37b. The supply hose 41 extends downward on the right side of the vapor separator 34 and is connected to the fuel filter 36, from which the lower side of the lowermost throttle body 12 is connected. It passes through and is connected to the lower end of the injector rail 17. Further, a return hose 42 is connected to the fuel return port 37c, and the return hose 42 extends along the supply hose 40 substantially in parallel therewith and is connected to the outlet of the regulator 43. This regulator 43 is provided on the injector rail 17
It is for adjusting the internal fuel pressure, and its inlet is connected to the upper end of the injector rail 17.

Next, the function and effect of this embodiment will be described. In the fuel supply device 30 of the present embodiment, the fuel in the fuel tank 31 is pumped up by the diaphragm pump 33a and stored in the vapor separator 34, and the fuel in the vapor separator 34 is sucked up by the electromagnetic pump 35 to lower the lower end of the injector rail 17. Pump to. And injector rail 1
Pressurized fuel introduced from the lower end of 7 is supplied to each injector 16
And the remaining fuel is returned from the regulator 43 to the vapor separator 34.

In this embodiment, the throttle body 1
2, the injector 16 is attached to the throttle body 12, and the rail support boss portion 12b is integrally formed on each throttle body 12.
An injector rail 17 is attached to each rail support boss 12b.
Since it is laid over and fixed, the intake path can be shortened and the space for arranging the injector rail can be shortened as compared with the case where the injector is mounted with the support member interposed in the intake passage or the injector rail is attached via the bracket. Can be made smaller. As a result, the engine as a whole can be made compact, and the outboard motor can be made compact.

Further, since the injector rail 17 is arranged on the right side of the engine 1 in the same direction as the crankshaft 5 and the vapor separator 34 is arranged on the left side of the engine 1, the empty space around the engine is effectively utilized. The injector rail 17 and the vapor separator 34 can be arranged in a well-balanced manner, and from this point as well, compactness can be accommodated.

Further, each throttle body 12 is positioned and fixed by a fixing plate 24, and an injector 16 and an injector rail 17 are attached to the throttle body 12.
Since these are assembled and integrated, these parts can be handled as a single assembly part. Therefore, the assembly work on the production line can be facilitated, and the productivity can be improved and the manufacturing cost can be reduced.

Further, in this embodiment, the vapor separator 34 has a two-part structure of an upper case 34b and a lower case 34a, and a fuel supply port 37a, a fuel supply port 37b, and a fuel return port 37c are provided in the upper case 34b. Since it is formed, the processing of each of the connection ports 37a to 37c only needs to be performed on the upper case 34b, the processing on the lower case 34a can be unnecessary, and the processing cost can be reduced as compared with the case of forming the connection ports on both cases. It can be reduced. Since the connection ports 37a to 37c are formed in the upper case 34b, the hose 40
The wiring structure of ~ 42 can be simplified.

Further, the pressurized fuel from the vapor separator 34 is introduced into the lower end of the injector rail 17,
Since the return fuel is returned from the upper end of this, the air in the fuel can be easily removed.

In the above embodiment, the fuel filter 36 is arranged below the vapor separator 34, but in the present invention, as shown in FIG. 9, the fuel filter 36 is arranged.
May be arranged on the side of the lower end portion of the injector rail 17, and in this case, substantially the same effect as that of the above embodiment can be obtained.

[0034]

As described above, according to the fuel supply device for an outboard motor of the first aspect of the present invention, the vapor separator has a two-part structure of an upper case and a lower case, and the upper case has a fuel supply passage, Since the fuel supply passage and the fuel return passage are connected, there is an effect that the installation space of each passage can be made small and the installation route can be simplified, and the entire outboard motor can be compactly constructed. It suffices to process the connection port of each passage, which is easy to process, and thus has the effect of reducing the cost of parts.

According to the second aspect of the present invention, the vapor separator is arranged on one side of the engine and the fuel supply rail is arranged on the other side of the engine. Therefore, the space around the engine can be effectively used. There is an effect that the overall size can be reduced.

According to the third aspect of the invention, the fuel supply rail is arranged on the opposite side of the vapor separator in a vertical direction, and the fuel is introduced from the lower end portion of the fuel supply rail and returned from the upper end portion thereof. As a result, the air in the fuel accumulates in the return passage located at the highest position, so that it is possible to reliably perform air bleeding, and it is possible to avoid obstacles in fuel supply due to the accumulation of air in the fuel supply rail. .

[Brief description of drawings]

FIG. 1 is a front view for explaining a fuel supply device for a two-cycle engine for an outboard motor according to an embodiment of the present invention.

FIG. 2 is a plan view of the apparatus of the embodiment.

FIG. 3 is a right side view of the apparatus according to the embodiment.

FIG. 4 is a cross-sectional view of a vapor separator of the apparatus of the above embodiment.

FIG. 5 is a schematic diagram of a two-cycle engine for an outboard motor to which the device of the above-described embodiment is applied.

6 is a sectional view taken along line VI-VI of FIG. 7.

7 is a sectional view taken along line VII-VII of FIG.

FIG. 8 is a schematic configuration diagram of the engine of the embodiment.

FIG. 9 is a front view showing an arrangement structure according to a modified example of the apparatus of the embodiment.

[Explanation of symbols]

1 2 cycle engine 16 injector (fuel injection valve) 17 injector rail (fuel supply rail) 30 fuel supply device 31 fuel tank 34 vapor separator 34a lower case 34b upper case 35 electromagnetic pump (fuel pump) 37a fuel supply passage 37b fuel supply Passage 37c Fuel return passage

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display area F02M 37/20 B

Claims (3)

[Claims] 1. The fuel from a fuel tank mounted on the hull side is stored in a vapor separator mounted on the outboard motor side,
In a fuel supply system for an outboard motor, wherein the fuel in the vapor separator is supplied to an engine by a fuel pump, the vapor separator has an upper case and a lower case divided into upper and lower parts, and the upper case is provided with the fuel. A fuel supply device for an outboard motor, comprising a fuel supply passage from the tank side, a fuel supply passage to the engine, and a fuel return passage from the engine side. 2. Fuel from a fuel tank mounted on the hull side is stored in a vapor separator mounted on the outboard motor side,
A fuel supply device for an outboard motor, wherein the fuel in the vapor separator is supplied by a fuel pump to a fuel supply rail mounted on a fuel injection valve of the engine, wherein the vapor separator is arranged on one side of the engine and A fuel supply device for an outboard motor, wherein a fuel supply rail is arranged on the other side of the engine. 3. The engine according to claim 2, wherein the engine is a vertically installed engine having a crankshaft vertically arranged, and the fuel supply rail is vertically arranged in the same direction as the crankshaft. Fuel supply passage of the outboard motor is connected to the lower end of the fuel supply rail, and a fuel return passage from the fuel supply rail is connected to the upper end of the fuel supply rail. Supply device.