JP2015227628A - Outboard engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To arrange electrical components so that efficient wiring is achieved and cooling efficiency is improved.SOLUTION: An outboard engine 1 has a crank shaft 4 arranged substantially vertically and is mounted with a vertical V type engine unit 3 installed such that right and left cylinder parts are spread backward in a V shape in plane view. At a rear width-directionally center part of the engine unit 3, an intake system unit 34 is arranged which has a surge tank 32 and intake pipes 33 for connecting the surge tank 32 to right and left intake ports 27 in the cylinder head 19. Then an electronic control unit 36 is arranged on the right side of the intake system unit 34 and substantially in the center in a height direction.

Description

  The present invention relates to an outboard motor equipped with a vertical V-type engine unit.

An outboard motor equipped with an engine unit is provided with an electronic control unit that controls the engine unit.
As this type of technology, for example, Patent Document 1 discloses a configuration in which an ECU (Engine Control Unit) is arranged in front of a cylinder block that constitutes an engine body.

JP 2009-197744 A

It is preferable that the electronic control unit is arranged around the engine unit to be controlled mainly and can be efficiently wired.
On the other hand, in an outboard motor, the engine unit may be covered with an engine cover, and when the electronic control unit is disposed around the engine unit, it is necessary to improve the cooling efficiency of the electronic control unit.

  The present invention has been made in view of the above points, and an object of the present invention is to arrange electrical components so that wiring can be efficiently performed and cooling efficiency is improved.

An outboard motor according to the present invention is a ship on which a vertical V-type engine unit is installed, in which a crankshaft is disposed substantially vertically and left and right cylinder portions are opened in a V-shape in plan view toward the rear. An intake system that is an external unit and has a surge tank and an intake pipe for connecting the surge tank to the intake ports of the left and right cylinders at the center in the width direction behind the vertical type V-type engine unit A unit is disposed, and electrical components are disposed on either the left or right side of the intake system unit.
Another feature of the outboard motor according to the present invention is that the electrical component includes a flat housing and is arranged to extend in the front-rear and vertical directions.
Another feature of the outboard motor of the present invention is that the electrical component is an electronic control unit. In this case, an electronic control throttle may be provided on the intake system unit, and the electronic control unit and the electronic control throttle may be connected via a wire harness.
Another feature of the outboard motor of the present invention is that fuel supply system parts are arranged on either the left or right side of the intake system unit.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to wire efficiently, an electrical component can be arrange | positioned so that cooling efficiency may be improved.

It is a left view which shows the outline | summary of an outboard motor. It is a top view of an engine unit. It is a plane sectional view of an engine unit. It is a right view of an engine unit. It is a left view of an engine unit. It is a perspective view of an engine unit. It is a figure for demonstrating a fuel supply system.

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.
As shown in FIG. 1, the outboard motor 1 includes an engine holder 2, and an engine unit 3 is installed above the engine holder 2. The engine unit 3 is installed such that the crankshaft 4 is disposed substantially vertically (vertically) in the interior thereof, and the left and right cylinder portions open in a V shape in plan view toward the rear, that is, have a V bank. This is a vertical type water-cooled four-cycle V-type six-cylinder engine unit (see FIG. 2).

  Below the engine holder 2, an oil pan 5 for storing lubricating oil is disposed. A bracket device 6 is attached to the outboard motor 1, and the outboard motor 1 is attached to the transom 7 a of the ship 7 via the bracket device 6. In the present application, each direction is referred to with the ship 7 side as the front, and in each figure, the front is indicated by Fr and the rear is indicated by Rr.

  The engine unit 3, the engine holder 2, and the oil pan 5 are covered with an engine cover 8. The engine cover 8 includes a lower engine cover 9 that covers the lower half of the engine unit 3 from the side, and an upper engine cover 10 that covers the lower engine cover 9 from above and covers the upper half of the engine unit 3. .

  A drive shaft housing 11 is installed around and below the oil pan 5. In the engine holder 2, the oil pan 5 and the drive shaft housing 11, a drive shaft 12 that is an output shaft of the engine unit 3 is disposed substantially vertically. A clutch mechanism 13 is disposed in a gear case 14 provided at the lower portion of the drive shaft housing 11. The drive shaft 12 extends downward in the drive shaft housing 11 and is configured to drive a propeller 16 that is a propulsion device via a clutch mechanism 13, a propeller shaft 15, and the like.

  As shown in FIGS. 2 to 6, in the engine unit 3, the crankcase 17 is disposed at the front portion, and the cylinder block 18 is joined to the rear portion of the crankcase 17. The cylinder block 18 has a left bank portion 18L and a right bank portion 18R that open to the left and right toward the rear. A cylinder head 19 is provided corresponding to each of the left bank portion 18L and the right bank portion 18R, and a cylinder head cover 20 is mounted on the rear portion of each cylinder head 19. The cylinder block 18, the cylinder head 19, and the cylinder head cover 20 are referred to as a cylinder portion.

As shown in FIG. 3, three cylindrical sleeves 21 (cylinders) are formed in the left bank portion 18L and the right bank portion 18R so as to be arranged substantially horizontally in the vertical direction. The illustrated piston is slidably inserted.
The crankshaft 4 is arranged substantially vertically on the joint surface between the crankcase 17 and the cylinder block 18, and the crankshaft 4 and the piston are connected by the connecting rod 22, so that the reciprocating stroke of the piston is the rotational motion of the crankshaft 4. Is converted to A flywheel magneto device 23 is connected to the upper end of the crankshaft 4.

  A combustion chamber 24 aligned with the sleeve 21 is formed in the cylinder head 19, and a spark plug 25 is coupled from the outside thereof. The ignition plug 25 is provided with an ignition coil 26 for discharging. Further, an intake port 27 and an exhaust port 28 connected to the combustion chamber 24 are formed in the cylinder head 19. The intake port 27 extends toward the inside of the V bank. The exhaust port 28 is connected to an exhaust passage 29 formed outside the cylinder block 18. Although not shown in the drawing, an intake valve and an exhaust valve that open and close both ports 27 and 28 are arranged in the cylinder head 19.

  The left and right delivery pipes 30L and 30R are arranged inside the V bank (see FIG. 7). Each delivery pipe 30L, 30R extends in the vertical direction, and two injectors 31 are provided for each cylinder. The injector 31 injects fuel into the air supplied to the intake port 27 and guides it to the combustion chamber 24 of each cylinder.

An intake system unit 34 having a surge tank 32 and an intake pipe 33 for connecting the surge tank 32 to the left and right intake ports 27 in the cylinder head 19 is disposed at the center in the width direction behind the engine unit 3. .
The surge tank 32 is disposed rearward of the cylinder part, has a width equal to or greater than the maximum opening width of the V bank, and has a height comparable to the height of the cylinder part.
The intake pipe 33 is integrated as an intake manifold. There are six intake pipes 33 corresponding to the number of cylinders, and these intake pipes 33 are alternately arranged up and down and extend toward the inside of the V bank so as to converge in a substantially V shape.
Further, an electronic control throttle 35 is attached to the upper part of the intake system unit 34 to control the flow rate of air introduced into the surge tank 32.

Here, as shown in FIGS. 4 and 6, an electronic control unit 36 is disposed as an electrical component on the right side of the intake system unit 34 at a substantially central position in the height direction. The electronic control unit 36 is accommodated in the housing, and is disposed so as to face the intake system unit 34, that is, to extend in the front-rear and vertical directions. As shown in FIG. 2, the casing of the electronic control unit 36 has a flat surface on the outside and a shape in which the thickness increases toward the front in accordance with the intake pipe, and has a flat shape as a whole. The intake system unit 34 is provided with boss portions 37 projecting sideways, and the electronic control unit 36 is supported by the boss portions 37. When supporting the electronic control unit 36 by the boss part 37, it is preferable to interpose a vibration reducing material.
A connector portion 36 a of the wire harness 38 is provided at the front portion of the electronic control unit 36. By leading the wire harness 38 from the front part of the electronic control unit 36, the wire harness 38 is extended upward on the side of the engine unit 3, and is wired so that the upper surface of the engine unit 3 is turned up and connected to each part. be able to. In each drawing, the wire harness 38 is provided with a pattern in order to distinguish it from other piping.

Further, as shown in FIG. 5, a high-pressure fuel filter 39, which is a fuel supply system component, is disposed on the left side of the intake system unit 34 and at a substantially central position in the height direction. The intake system unit 34 is provided with boss portions 37 projecting sideways, and the high pressure fuel filter 39 is supported by the boss portions 37.
Further, a vapor separator 40 that is a fuel supply system component is disposed below the high-pressure fuel filter 39, more specifically below the intake pipe 33 of the lowermost cylinder of the intake system unit 34. The vapor separator 40 incorporates a high-pressure fuel pump. The high-pressure fuel pump built in the vapor separator 40 is a precision machine part, and it is necessary to take a seismic isolation measure. In the type in which the engine unit 3 is cantilevered upward from the engine holder 2, the vibration increases as the engine unit 3 is located above the engine unit 3. By arranging the high-pressure fuel pump below the engine unit 3 in this way, Seismic isolation structure can be used.

A first low-pressure fuel filter 41 is disposed in the front part of the engine unit 3. If the case of the first low-pressure fuel filter 41 is transparent, the fuel properties (turbidity, starch, alteration, deterioration, etc.) can be visually confirmed. The first low-pressure fuel filter 41 is disposed at the front portion of the engine unit 3 so that visual inspection, inspection, and filter replacement can be performed easily.
Further, on the right side of the intake system unit 34, a low-pressure fuel pump (pumping pump) 42 and a first pump are disposed below the electronic control unit 36, more specifically below the intake pipe 33 of the lowermost cylinder of the intake system unit 34. Two low-pressure fuel filters 43 are arranged side by side. The low-pressure fuel pump 42 is also a precision mechanical component like the high-pressure fuel pump built in the vapor separator 40, and can be provided with a simple seismic isolation structure by being disposed at the lower part of the engine unit 3.

The fuel supply system will be described. As shown in FIG. 7, the fuel that has passed through the first low-pressure fuel filter 41 from the fuel tank on the hull side is guided to the vapor separator 40 via the hose 44, the one-way valve 45, and the hose 46. It is burned. Here, a route of a hose 47, a second low-pressure fuel filter 43, a low-pressure fuel pump 42, and a hose 48 is connected to the one-way valve 45. At the time of starting (when the fuel is insufficient in the vapor separator 40), the vapor separator is directly removed from the fuel tank on the hull side by the squeeze pump upstream of the first low pressure fuel filter 41 without passing through the low pressure fuel pump 42. 40 is supplied with fuel. After the fuel in the vapor separator 40 reaches a specified amount, the fuel is automatically supplied from the low pressure fuel pump 42.
The fuel led to the vapor separator 40 is led to the high-pressure fuel filter 39 via the high-pressure hose 49 by the built-in high-pressure fuel pump, and then led to the upper end of the delivery pipe 30L of the left bank via the high-pressure hose 50. The fuel flowing through the delivery pipe 30L is injected from the injector 31, and the remaining fuel is guided from the lower end of the delivery pipe 30L to the lower end of the delivery pipe 30R in the right bank through the high pressure hose 51. The fuel flowing through the delivery pipe 30R is injected from the injector 31, and the remaining fuel is returned to the vapor separator 40 from the upper end of the delivery pipe 30R through the hose 52, and is then cooled by the fuel cooler 53. Except for FIG. 7, some illustrations of each hose are omitted.

  As described above, on both sides of the intake system unit 34, there is a triangular zone surrounded by the cylinder portion and the engine cover 8 (not shown except for FIG. 1), and a relatively small low-pressure fuel pump 42 or By arranging the electronic control unit 36 and the relatively large vapor separator 40 on the other side, the left and right balance can be achieved, and the size can be reduced.

In the vertical type V-type engine unit, heat is dissipated from the crankcase 17 and the flywheel magneto device 23, whereas the cylinder portion where the water jacket is formed and the intake system unit 34 into which air flows from the outside are so much. Heat is not dissipated. That is, the rear part of the engine unit 3 tends to be lower in temperature than the front part.
By disposing the electronic control unit 36 on the side of the intake system unit 34 that becomes relatively low in this way, it is possible to prevent the durability and performance of the electronic control unit 36 from deteriorating. Thereby, it is not necessary to provide heat insulation or heat insulation, and the cost can be reduced. By arranging the electronic control unit 36 so as to face the intake system unit 34 as described above, the cooling effect can be further enhanced.

  Similarly, by disposing the vapor separator 40 on the side in the plan view of the intake system unit 34 that has a relatively low temperature, the vapor separator 40 is not affected by heat, and the amount of fuel vapor generated can be suppressed.

Further, the target members controlled by the electronic control unit 36 at the rear portion of the engine unit 3, that is, the cylinder portion side are the electronic control throttle 35, the ignition coil 26, the injector 31, a high-pressure fuel pump (built in the vapor separator 40), and a low-pressure fuel pump. 42, and various sensors such as a sensor (not shown) (CMP sensor, intake pressure sensor, intake air temperature sensor, wall temperature sensor, exhaust temperature sensor, knock sensor, O ₂ sensor, etc.) There are more than the target members to be controlled. By disposing the electronic control unit 36 on the side of the intake system unit 34, the electronic control unit 36 can be brought close to the target member at the rear of the engine unit 3, and the wire harness 38 can be efficiently wired. By connecting the wire harness 38 to the front part of the electronic control unit 36 as described above, it is possible to connect to the target member at the rear part of the engine unit 3 at a short distance, and the wire harness 38 is made shorter and its weight is reduced. It is possible to reduce more.

  Further, by disposing a vapor separator 40 (with a built-in high-pressure fuel pump) on the side of the intake system unit 34 in a plan view, it is possible to approach the delivery pipe 30L disposed inside the V bank. As a result, the length of the high-pressure fuel pipe (high-pressure hoses 49 and 50) connecting the vapor separator 40 (with a built-in high-pressure fuel pump) to the delivery pipe 30 can be shortened, and the cost can be reduced. Further, since the high-pressure fuel pipes (high-pressure hoses 49, 50) pass through the side of the intake system unit 34, which is at a relatively low temperature, the fuel is not overheated. An appropriate amount of fuel can be injected from the injector.

As mentioned above, although this invention was demonstrated with various embodiment, this invention is not limited only to these embodiment, A change etc. are possible within the scope of the present invention.
For example, the electronic control unit 36 may be disposed on the left side of the intake system unit 34 and the high-pressure fuel filter 39 and the vapor separator 40 may be disposed on the right side.

  1: outboard motor, 3: engine unit, 4: crankshaft, 17: crankcase, 18: cylinder block, 19: cylinder head, 20: cylinder head cover, 32: surge tank, 33: intake pipe, 34: intake unit 35: Electronic control throttle, 36: Electronic control unit, 38: Wire harness

Claims (5)

An outboard motor on which a vertical V-type engine unit is installed so that a crankshaft is arranged substantially vertically and left and right cylinder parts open rearward in a V-shape in plan view,
An intake system unit having a surge tank and an intake pipe for connecting the surge tank to the intake ports of the left and right cylinder parts is disposed in the center in the width direction behind the vertical V-type engine unit,
An outboard motor, wherein electrical components are arranged on either the left or right side of the intake system unit.   2. The outboard motor according to claim 1, wherein the electrical component includes a flat casing and is arranged to extend in the front-rear direction and the up-down direction.   The outboard motor according to claim 1, wherein the electrical component is an electronic control unit. An electronically controlled throttle is provided at the top of the intake system unit,
The outboard motor according to claim 3, wherein the electronic control unit and the electronic control throttle are connected via a wire harness.   The outboard motor according to any one of claims 1 to 4, wherein fuel supply system parts are arranged on either the left or right side of the intake system unit.

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