JP4111366B2 - Rust prevention device for fuel injection system parts in outboard motors - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to the technical field of rust prevention devices for fuel injection system parts in an outboard motor.
[0002]
[Background Art and Problems to be Solved by the Invention]
In an outboard motor, it is inevitable that seawater is mixed into the fuel tank due to refueling at sea due to the usage environment. In this case, outboard motors that use a fuel injection system usually use iron-based parts such as electric pumps, injectors, and regulators, so if seawater enters the fuel, rusting occurs. The influence on the inside of the parts becomes a problem. In particular, regarding the electric pump for supplying fuel, it also serves as cooling of the inside of the main body, and the fuel is allowed to flow directly around the armature, brush, etc. When seawater is mixed in the fuel,
(1) Parts such as motor bearings corrode, causing abnormal noise and vibration from the pump, and friction increases due to bearing backlash, resulting in increased current consumption.
(2) Since seawater has electrical conductivity, a local short circuit occurs in the brush part, and the progress of brush wear is accelerated.
(3) Electrolysis of water occurs at the brush part, and the metal cation and hydroxyl group in seawater react with each other to generate salt (hydroxide), that is, foreign matter is generated in the fuel and pressure loss is increased. Such problems arise.
[0003]
For this reason, there is a conventional example of premixing all the oil for engine lubrication in the outboard motor or one port of the oil pump for engine lubrication in the fuel, but only for rust prevention inside the parts. Then, it is not necessary to mix a large amount of oil, as in the case of a direct injection engine, when oil for engine lubrication cannot be premixed in the fuel, or by excessive premixing of oil, white smoke, deterioration of oil consumption, There is a problem that plug fouling occurs.
[0004]
The present invention solves the above-mentioned conventional problems, and even when seawater is mixed in the fuel, the required amount of oil is always premixed in the fuel, thereby preventing rust prevention inside the fuel injection system components. An object of the present invention is to provide a rust preventive device for fuel injection system parts in an outboard motor that can be realized.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, an invention according to claim 1 is a rust preventive device for fuel injection system parts, in an outboard motor equipped with a fuel injection type engine having a crankshaft arranged in a vertical direction. A fuel tank attached via an anti-vibration damper and a premix oil pump attached to the fuel tank are provided, and the plunger of the premix oil pump is arranged so as to be substantially parallel to the crankshaft. and, a portion of the oil for lubricating the engine is characterized in that to premix the fuel, invention of claim 2, in claim 1, wherein the engine is a fuel injection engine in-cylinder, premix The oil pipe is connected to the return pipe of the high-pressure fuel.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view of an outboard motor showing an embodiment of the present invention, where FIG. 1 (A) is a plan view of the engine, and FIG. 1 (B) is a longitudinal sectional view taken along line BB in FIG. 1 (A). (C) is a side view of the outboard motor, and (D) is a configuration diagram of the fuel supply system.
[0007]
Reference numeral 1 denotes an outboard motor. An engine 2 on which the crankshaft 10 is mounted in a vertical state, a guide exhaust portion 3 connected to the lower end surface of the engine 2 and supporting the engine 2, and a lower end surface of the guide exhaust portion 3 The upper case 4, the lower case 5, and the propeller 6 are connected. The engine 2 is an in-cylinder injection type V-type six-cylinder two-cycle engine, and the six cylinders 7a to 7f are arranged horizontally in two rows so as to form a V bank in plan view. A cylinder head 8 is connected and fixed to the cylinder body 7.
[0008]
Pistons 11 are slidably fitted in the cylinders 7 a to 7 f, and each piston 11 is connected to the crankshaft 10. The cylinder head 8 is equipped with a solenoid opening / closing type fuel injection valve 13 and a spark plug 14 that are opened and closed by magnetic force. The cylinders 7a to 7f communicate with the crank chamber 12 through scavenging ports (not shown), and an exhaust port 15 is connected to the cylinders 7a to 7f. The exhaust port 15 in the left bank in FIG. 1B is joined to the left collective exhaust passage 16, and the exhaust port 15 in the right bank is joined to the right collective exhaust passage 17. An intake passage 19 branched from the intake manifold is connected to the crank chamber 12 of the engine 2, and a reed valve 20 for preventing backflow is disposed at a connection portion of the intake passage 19 to the crank chamber 12. Further, an oil pump 21 for supplying and lubricating oil into the engine and a throttle valve 22 for adjusting the intake air amount are disposed on the upstream side of the reed valve 20.
[0009]
As shown in FIG. 1 (D), the fuel in the fuel tank 23 installed on the hull side is passed through a fuel filter 26 by a manual first low-pressure fuel pump 25 and a second low-pressure on the outboard motor side. It is sent to the fuel pump 27. The second low-pressure fuel pump 27 is a diaphragm pump that is driven by the pulse pressure of the crank chamber 12 of the engine 2 and sends fuel to a vapor separator tank 29 that is a fuel tank having a gas-liquid separation function. A fuel preload pump 30 driven by an electric motor is disposed in the vapor separator tank 29, and the fuel is pressurized and sent to the high pressure fuel pump 32 through the preload pipe 31. The discharge side of the high-pressure fuel pump 32 is connected to a fuel supply rail 33 arranged in the vertical direction along each cylinder 7 a to 7 f, and is connected via a high-pressure control valve 35, a fuel cooler 36, and a return pipe 37. Are connected to the vapor separator tank 29. A preload pressure adjustment valve 39 is provided between the preload pipe 31 and the vapor separator tank 29. The high pressure fuel pump 32 is driven by a pump drive unit 40. The pump drive unit 40 is connected to the crankshaft 10 via a belt 41.
[0010]
The oil pump 21 for engine lubrication is a pump driven by the rotation of the crankshaft 10, and oil is supplied into the intake passage 19 from a sub tank 50 installed on the hull side through a main tank 51 arranged on the engine side. Supply. The oil in the main tank 51 is configured to be supplied to the vapor separator tank 29 via the filter 52, the premix oil pump 53, and the check valve 54. The premix oil pump 53 employs a system driven by an electromagnetic solenoid or a pump driven by an electric motor. The premix oil 53 may be supplied to the high-pressure fuel return pipe 37 or may be supplied to the discharge side of the second low-pressure fuel pump 27.
[0011]
The ECU (electronic control unit) 42 receives detection signals from various sensors indicating the driving state of the engine 2, the outboard motor 1 and the state of the ship. For example, an engine rotation speed sensor 43 that detects the rotation angle (rotation speed) of the crankshaft 10, an intake air temperature sensor 44 that detects the temperature in the intake passage 19, a throttle opening sensor 45 that detects the opening of the throttle valve 22, An air-fuel ratio sensor 46 for detecting the air-fuel ratio in the uppermost cylinder 7d, a fuel pressure sensor 47 for detecting the pressure in the high-pressure fuel pipe, a cooling water temperature sensor 48 for detecting the cooling water temperature of the engine, and water in the fuel filter 26 A signal from the detection sensor 55 and the like is input. The ECU 42 performs arithmetic processing on the detection signals of these sensors based on the control map, and transmits the control signals to the fuel injection valve 13, the ignition plug 14, the preload fuel pump 30, and the premix oil pump 53.
[0012]
2 is a plan view of the outboard motor of FIG. 1, and FIG. 3 is a side view as seen from the Y direction of FIG. In the following description, the same components as those in the above-described drawings may be denoted by the same reference numerals and description thereof may be omitted. A driving pulley 60 is attached to the upper end of the crankshaft 10, a driven pulley 62 is fixed to the rotating shaft 61 of the pump driving unit 40, and a driving belt 41 is stretched between the driving pulley 60 and the driven pulley 62. ing. A high pressure fuel pump 32 is attached to the pump drive unit 40. As a result, the rotation of the crankshaft 10 is transmitted to the rotating shaft 61 via the drive belt 41 to drive the high-pressure fuel pump 32. The fuel supply rail 33 and the fuel injection valve 13 are fixed to the cylinder head 8 with bolts, and the fuel injection valve 13 is connected to the fuel supply rail 33. In the figure, 1a is a cowling (engine cover) covering the engine 2, 63 is a belt tensioner, and 64 is a silencer.
[0013]
A fuel filter 26, two low-pressure fuel pumps 27 connected in parallel, a vapor separator tank 29, an oil pump 21, and an oil tank 51 are attached to the side surface of the engine body 7. The fuel filter 26 is fixed to the engine body 7 by a bolt 26c via a vibration-proof damper 26b by a mounting bracket 26a. The bottom of the oil tank 51 and the suction side of the oil pump 21 are connected by an oil suction pipe 65, and the six discharge ports 21a of the oil pump 21 are connected to the intake passages 19 of the cylinders 7a to 7f by an oil supply pipe (not shown). (Fig. 1). An adjustment lever 66 adjusts the discharge amount of the oil pump 21 in conjunction with the throttle.
[0014]
The vapor separator tank 29 includes three mounting brackets 29g, and the mounting bracket 29g is fixed to the engine body 7 with bolts 68 via vibration-proof dampers 67 (FIG. 2). A recess 29h is formed from the bottom to the back of the vapor separator tank 29, and an attachment piece 29i extending from the case body 29a is formed in the recess 29h. The premix oil pump 53 described in FIG. 1 is attached to the attachment piece 29 i via an attachment bracket 69. The oil premix pipe 70 branched from the oil suction pipe 65, the oil filter 52, the premix oil pump 53, and the check valve 54 are connected to the vapor separator tank 29. In the present invention, the premix oil pump 53 is attached to the vapor separator tank 29 attached to the engine body 7 by the vibration damper 67, and the axial direction of the plunger 53a of the premix oil pump 53 is defined as the crankshaft. Since they are arranged almost in parallel, the influence of engine vibration (particularly vibration caused by a piston sliding in the horizontal direction) is minimized and the oil discharge amount is stabilized.
[0015]
In FIG. 2, a premix oil pipe 70a on the vapor separator tank 29 is formed of a transparent member so that the oil flow can be confirmed.
[0016]
FIG. 4 is a cross-sectional view showing the configuration of the vapor separator tank 29. The vapor separator tank 29 includes a case main body 29a, a lid body 29b fixed to the case main body 29a, a filter 56 and a preload fuel pump 30 disposed in the case main body 29a, and a check attached to the lid body 29b. A valve 57, a preload pressure adjusting valve 39, a fuel inlet 29c and an oil inlet 29d formed in the lid 29b, and a float valve 29e attached to the lower part of the fuel inlet 29c are provided. The preload fuel pump 30 has a pump impeller portion 30a, a coil portion 30b, and a brush portion 30c. Further, the oil inlet portion 29 d is communicated with the fuel return passage 29 f of the preload pressure adjusting valve 39. Reference numeral 29g denotes an engine mounting bracket.
[0017]
The operation of the present invention having the above configuration will be described. The fuel in the vapor separator tank 29 is preloaded by the fuel preload pump 30 to about 3 to 10 kg / cm ² , and the pressurized fuel is added to about 50 to 100 kg / cm ² by the high pressure fuel pump 32 or more. In the pressurized and pressurized high pressure fuel, surplus fuel exceeding the set pressure is returned to the vapor separator tank 29 by the pressure regulating valve 35, and only the necessary high pressure fuel is supplied to the fuel supply rail 33, and each cylinder 7a is supplied. ˜7f is supplied to the fuel injection valve 13. The oil pump 21 is driven by the rotation of the crankshaft 10 and supplies oil from the oil tank 51 into the intake passage 19 to lubricate the engine interior. Further, the premix oil pump 53 is driven to supply the oil in the oil tank 51 to the vapor separator tank 29 through the filter 52 and the check valve 54. For this reason, even if seawater is mixed in the fuel when the oil is premixed in the fuel and the fuel flows through the preload fuel pump 30, the preload pressure adjustment valve 39, and the fuel injection valve 14, the fuel injection system components are made by the oil. Rust prevention can be achieved.
[0018]
Here, the premix oil is used to prevent rust inside the parts, so there is no need to mix a large amount of oil. Excessive premixing of the oil causes white smoke, deterioration of oil consumption, plug fouling. Will occur. Therefore, the premix oil pump 53 is controlled so that the oil premix amount is optimized.
[0019]
Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications are possible. For example, in the above embodiment, the premix oil pump 53 is attached to the vapor separator tank 29, but it may be attached to the attachment bracket 26 a of the fuel filter 26. Also in this case, the premix oil pump 53 is attached to the fuel filter 26 attached to the engine body 7 by the vibration damper 26b, and the axial direction of the plunger 53a of the premix oil pump 53 is substantially parallel to the crankshaft. Therefore, the influence of engine vibration (particularly vibration caused by the piston sliding in the horizontal direction) can be minimized, and the oil discharge amount can be stabilized.
[0020]
Moreover, although the said embodiment demonstrated the example applied to the in-cylinder injection type 2 cycle engine, it is applicable also to an intake injection type, and can also be applied to a 4 cycle engine.
[0021]
【The invention's effect】
As is clear from the above description, according to the first and second aspects of the invention, even if seawater is mixed in the fuel, the oil is premixed in the fuel to prevent rust inside the fuel injection system components. Can
According to the invention of claim 3, the influence of engine vibration can be minimized, and the oil discharge amount can be stabilized.
According to invention of Claim 4, the oil for premixes can be supplied effectively.
[Brief description of the drawings]
FIG. 1 is a schematic view of an outboard motor showing an embodiment of the present invention, in which FIG. 1 (A) is a plan view of the engine, and FIG. 1 (B) is a longitudinal section taken along line BB of FIG. FIG. 2C is a side view of the outboard motor, and FIG. 2D is a configuration diagram of the fuel supply system.
FIG. 2 is a plan view of the outboard motor of FIG.
FIG. 3 is a side view seen from the Y direction in FIG. 2;
4 is a cross-sectional view showing the configuration of the vapor separator tank of FIG. 1. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Crankshaft 13 ... Fuel injection valve 21 ... Engine oil pump 26 ... Fuel filter 29 ... Vapor separator tank 32 ... High pressure fuel pump 53 ... Premix oil pump 53a ... Plunger 26b, 67 ... Anti-vibration damper

Claims (2)

In an outboard motor equipped with a fuel injection engine with a crankshaft arranged in a vertical direction, a fuel tank attached to the engine body via an anti-vibration damper, and a premix oil pump attached to the fuel tank The fuel injection is characterized in that a part of the oil for lubricating the engine is premixed with the fuel so that a plunger of the oil pump for premixing is arranged substantially parallel to the crankshaft. Rust prevention device for system parts. 2. The rust preventive device for fuel injection system parts according to claim 1, wherein the engine is an in-cylinder fuel injection type engine, and the premix oil pipe is connected to the return pipe of the high pressure fuel.

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