JP5387270B2 - Outboard motor fuel piping arrangement structure - Google Patents

Description

  The present invention relates to a fuel pipe arrangement structure for an outboard motor that improves the layout of fuel pipes that connect components of a fuel supply system arranged around an engine in the outboard motor.

  A fuel hose, which is a fuel pipe in a fuel supply system of an outboard motor, sequentially connects a fuel filter, a fuel pump, a vapor separator, a delivery pipe, and the like, and fuel is supplied from the delivery pipe to the fuel injector. As shown in Patent Document 1, when the valve mechanism of the engine is a double overhead camshaft (DOHC) type, the fuel filter is on the intake camshaft side and the fuel pump is on the exhaust camshaft on the top surface of the engine head cover. Installed on each side. The fuel hose connecting the fuel filter and the fuel pump is curved so as to largely bypass the head cover.

JP 2000-198493 A

  However, as described in Patent Document 1, since the fuel hose connecting the fuel filter and the fuel pump installed on the top surface of the head cover of the engine is arranged in a curved shape, the length of the hose is lengthened. End up. Further, in order to prevent the fuel hose from coming into contact with the engine cover covering the engine and causing damage, the engine cover has to be enlarged, and it has been difficult to reduce the size.

  An object of the present invention is to provide a fuel pipe arrangement structure for an outboard motor that can shorten the length of the fuel pipe and can reduce the size of the engine cover. .

  In the present invention, a vertical multi-cylinder four-cycle engine in which a plurality of cylinders are arranged in a substantially horizontal direction and a crankshaft is arranged in a substantially vertical direction is covered with an engine cover, and a fuel supply system installed around the engine In an outboard motor fuel pipe arrangement structure in which a fuel filter and a fuel pump of a component are connected by a fuel pipe, an ignition coil for each cylinder is installed in a substantially vertical direction on the top surface of the head cover of the engine. A fuel pump is installed on one side of the engine, and a fuel filter is installed on the other side, and a fuel pipe connecting the fuel pump and the fuel filter is adjacent to the top surface of the head cover. It is characterized by being arranged linearly between the ignition coils.

  According to the present invention, since the fuel pipe connecting the fuel pump and the fuel filter is arranged linearly on the top surface of the head cover, the length of the pipe is longer than that when the fuel pipe is curved. Since the fuel pipe is prevented from coming into contact with the engine cover, the engine cover can be reduced in size.

The right view which shows the outboard motor to which one Embodiment in the fuel piping arrangement | positioning structure of the outboard motor which concerns on this invention was applied. The right view which shows the engine etc. of FIG. The III arrow line view of FIG. The left view which shows the engine etc. of FIG. The partial left view which expands and shows the rear part of the engine of FIG.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 is a right side view showing an outboard motor to which an embodiment of the fuel pipe arrangement structure of the outboard motor according to the present invention is applied.

  As shown in FIG. 1, the outboard motor 10 drives the propeller 15 by the driving force of the mounted engine 14 to generate a propulsive force forward or outboard of the outboard motor. A mounting bracket device 12 as mounting means for supporting the outboard motor main body 11 and mounting it to the transom 16A of the hull 16, and an upper mount unit disposed between the outboard motor main body 11 and the mounting bracket device 12. 17 and a lower mount unit 18.

  The outboard motor main body 11 includes an engine holder 20, and the engine 14 is mounted on the engine holder 20. An oil pan 21 is disposed below the engine holder 20, a drive shaft housing 22 is installed below the oil pan 21, and a gear case 23 is installed below the drive shaft housing 22. The engine 14, the engine holder 20, and the oil pan 21 are covered with an engine cover 24.

  The engine 14 includes a crankcase 25, a cylinder block 26, a cylinder head 27, and a head cover 32 that are sequentially arranged from the front of the outboard motor to the rear of the outboard motor. Cylinders 19 </ b> A, 19 </ b> B, and 19 </ b> C (FIG. 2) in which pistons (not shown) reciprocate are formed in the cylinder block 26 in a substantially horizontal direction, and the crankshaft 28 is substantially between the crankcase 25 and the cylinder block 26. It is arranged in the vertical direction. As described above, the engine 14 is configured as a vertical type in which the cylinders 19A, 19B, and 19C are arranged in a substantially horizontal direction and the crankshaft 28 is arranged in a substantially vertical direction.

  A drive shaft 29 is connected to the lower end portion of the crankshaft 28 of the engine 14 in the same straight line, for example, splined. The drive shaft 29 extends substantially vertically in the engine holder 20, the oil pan 21, the drive shaft housing 22, and the gear case 23, and is connected to the propeller shaft 31 via a bevel gear 30 in the gear case 23. Thereby, the driving force of the engine 14 (that is, the rotational force of the crankshaft 28) is transmitted to the propeller 15 coupled to the propeller shaft 31 via the drive shaft 29, the bevel gear 30 and the propeller shaft 31.

  The mounting bracket device 12 includes a clamp bracket 35, a swivel bracket 36, a pilot shaft (steering shaft) 37, an upper mount bracket 38, and a lower mount bracket 39. The clamp bracket 35 is provided so that the transom 16A of the hull 16 can be gripped. The swivel bracket 36 is supported by the clamp bracket 35 via a swivel shaft 40 so as to be rotatable in the vertical direction.

  The pilot shaft 37 extends in the vertical direction on the swivel bracket 36 and is rotatably provided. The upper mount bracket 38 that also serves as the base end portion of the steering bracket 41 is coupled to the upper end of the pilot shaft 37, and the lower mount bracket 39 is coupled to the lower end of the pilot shaft 37 so as to rotate together. The outboard motor main body 11 is attached to the upper mount bracket 38 via the upper mount unit 17 and to the lower mount bracket 39 via the lower mount unit 18.

  As a result, the outboard motor main body 11 is pivotally supported so as to be pivotable in the left-right direction with respect to the clamp bracket 35 and the swivel bracket 36 around the pilot shaft 37, and together with the swivel bracket 36 about the swivel shaft 40. The clamp bracket 35 is pivotally supported so as to be pivotable in the vertical direction (tilt operation and trim operation).

  As shown in FIG. 2, the engine 14 is a water-cooled four-cycle three-cylinder engine in which a plurality of (for example, three) cylinders 19A, 19B, and 19C extending in the horizontal direction are arranged in a cylinder block 26 in the vertical direction. It is. As shown in FIG. 3, ignition coils (direct ignition coils) 42A, 42B, and 42C are installed on the top surface 32A of the head cover 32 of the engine 14 (that is, the rear surface of the engine 14) for each cylinder. The valve mechanism of the engine 14 is a direct overhead camshaft (DOHC) type, and an intake camshaft 43 having an intake cam (not shown) on the left side in FIG. 3 and an exhaust cam (not shown) on the right side in FIG. An exhaust camshaft 44 is pivotally supported in the head cover 32.

  Around the engine 14, electrical components 45 and an exhaust device 46 are collectively arranged on the right side surface (exhaust cam shaft 44 side surface) shown in FIG. 2, and the left side surface (intake cam shaft 43 side) shown in FIG. The intake devices 47 are arranged in a concentrated manner on the side surface. A fuel supply system 48 is arranged in a range from the right side surface of the engine 14 to the left side surface through the rear surface (the top surface 32A of the head cover 32).

  The exhaust device 46 shown in FIG. 2 includes an exhaust cover 49 that covers the right side surface (side surface on the exhaust camshaft 44 side) of the cylinder block 26. The exhaust cover 49 communicates with an exhaust port (not shown) of the cylinder head 27 and covers an exhaust passage (not shown) formed in the cylinder block 26 to constitute an exhaust manifold. Exhaust gas guided to the exhaust manifold passes through exhaust passages (not shown) formed in the engine holder 20, the oil pan 21, and the drive shaft housing 22, respectively, and mainly, the propeller shaft 31 in the gear case 23 shown in FIG. It is discharged into the water from the surrounding exhaust passage.

  Here, the engine 14 is a water-cooled engine, and uses cooling water taken from a water intake 50 provided in the gear case 23, for example, seawater. When the engine 14 is operated, the cooling water is taken from the water intake 50 by the motor pump 51 driven by the drive shaft 29 and supplied to each part of the engine 14 through a water jacket (not shown) in the engine holder 20. . The cooling water that has cooled each part of the engine 14 reaches the engine holder 20 through the cooling water return hose 52 shown in FIGS. 2 and 3, and is mixed with a part of the exhaust gas in the drive shaft housing 22 and discharged outside the machine. Is done.

  As shown in FIG. 4, the intake device 47 is configured by sequentially connecting a silencer 53, a throttle body 54, and an intake manifold 55. The intake manifold 55 includes a surge tank portion 56 connected to the throttle body 54, and an intake pipe portion 57 that communicates with the surge tank portion 56 and is connected to an intake port (not shown) in each cylinder of the cylinder head 27. Is integrally formed. A fuel injector 62 (described later) is installed in the cylinder head 27 for each cylinder. The fuel injector 62 injects fuel into the air supplied to each intake port via the silencer 53, the throttle body 54, and the intake manifold 55, and guides it to the combustion chamber (not shown) of each cylinder.

  The fuel supply system 48 includes a fuel filter 58, a fuel pump 59, a vapor separator 60, a delivery pipe 61, and a fuel injector 62 installed around the engine 14, as shown in FIGS. Each component is configured by being connected by a fuel hose 63 as a fuel pipe.

  The fuel filter 58 shown in FIG. 2 is connected to a fuel tank (not shown) installed in the hull 16 using a first fuel hose 63A. As shown in FIG. 3, the fuel filter 58 and the fuel pump 59 are in the second fuel hose 63B, and as shown in FIG. 4, the fuel pump 59 and the vapor separator 60 are in the third fuel hose 63C, and the vapor separator. 60 and the delivery pipe 61 are connected to each other by a fourth fuel hose 63D.

  As shown in FIG. 3, the fuel filter 58 and the fuel pump 59 are installed in the lower portion (that is, the engine holder 20 side portion) of the top surface 32 </ b> A of the head cover 32. That is, the top surface 32 </ b> A of the head cover 32 is formed as a breather chamber 64, with the upper portion (that is, the portion on the opposite side of the engine holder 20) bulging out toward the outboard motor. Blow-by gas in the crankcase 25 is introduced into the breather chamber 64 to perform gas-liquid separation. The lower part of the top surface 32A of the head cover 32 is recessed in front of the outboard motor from the upper part, and is provided at a position lower than the upper part. A fuel filter 58 and a fuel pump 59 are installed at the lower part of the top surface 32 of the head cover 32.

  Of these, the fuel pump 59 is on the left side (ie, the intake camshaft 43 side) as one side of the engine 14, and the fuel filter 58 is the right side (ie, the exhaust cam) as the other side of the engine 14. Installed on the shaft 44 side). The fuel filter 58 and the fuel pump 59 are arranged on both sides of a plurality of, for example, three ignition coils 42A, 42B, and 42C provided for each cylinder.

  As shown in FIG. 4, a space is formed between the left side surface of the engine 14 (side surface on the intake camshaft 43 side) and the intake manifold 55, and the vapor separator 60 is installed in this space. The vapor separator 60 separates fuel vapor generated from liquid fuel (for example, gasoline) by ambient heat, and allows only this fuel vapor to be released into the atmosphere.

  The delivery pipe 61 is provided outside the cylinder head 27 in a straight line parallel to the crankshaft 28 (FIG. 1), and a plurality of (for example, three) fuel injectors installed in the cylinder head 27 for each cylinder. 62 communicates. The delivery pipe 61 distributes the fuel supplied from the vapor separator 60 and guides it to the plurality of fuel injectors 62.

  Incidentally, as shown in FIG. 3, the second fuel hose 63B connecting the fuel filter 58 and the fuel pump 59 is arranged on the top surface 32A of the head cover 32 in the arrangement direction of a plurality of cylinders (that is, the vertical direction of the engine 14). ) To extend in a straight line substantially orthogonal to.

  That is, the second fuel hose 63B is linearly disposed between the adjacent ignition coils 42B and 42C installed at the lower part of the top surface 32A of the head cover 32. Thereby, as shown in FIG. 5, the second fuel hose 63B is set at substantially the same position as the ignition coils 42B and 42C in the front-rear direction of the outboard motor 10, and protrudes rearward from the ignition coils 42B and 42C. It is provided not to.

  In order to dispose the fuel hose 63B between the adjacent ignition coils 42B and 42C as described above, the union 58A of the fuel filter 58 and the union 59A of the fuel pump 59 are arranged between the adjacent ignition coils 42B and 42C. They are oriented so that they face each other. One end of the second fuel hose 63B is joined to the union 58A of the fuel filter 58, and the other end is joined to the union 59A of the fuel pump 59, so that the second fuel hose 63B connects the fuel filter 58 and the fuel pump 59 to each other. Connecting.

  Further, the adjacent ignition coils 42B and 42C in which the second fuel hose 63B is disposed are disposed opposite to each other in the vertical direction of the engine 14 so that these connector mounting portions 65 are separated from the second fuel hose 63B. Is done. This prevents the connectors (not shown) attached to the respective connector attachment portions 65 of the ignition coils 42B and 42C from interfering with the second fuel hose 63B.

  As shown in FIG. 2, the first fuel hose 63 </ b> A connecting the fuel tank in the hull 16 and the fuel filter 58 intersects the coolant return hose 52 on the right side of the cylinder head 27. For example, a connector unit 66 in which the back surfaces of a pair of C-shaped connectors are joined together, the first fuel hose 63A is fitted to one connector of the connector unit 66, and the cooling water return hose 52 is fitted to the other connector. , The first fuel hose 63A is held by the coolant return hose 52.

  With the configuration as described above, the following effects (1) to (5) are achieved according to the present embodiment.

  (1) Since the second fuel hose 63B connecting the fuel filter 58 and the fuel pump 59 is arranged linearly on the top surface 32A of the head cover 32 of the engine 14, the second fuel hose 63B is curved. The hose length can be shortened and the fuel filter 58 and the fuel pump 59 can be connected in the shortest distance as compared with the case where they are disposed. As a result, the second fuel hose 63B is prevented from contacting the engine cover 24, so that the engine cover 24 can be reduced in size.

  In particular, since the second fuel hose 63B is disposed between the adjacent ignition coils 42B and 42C on the top surface 32A of the head cover 32, the positions of the second fuel hose 63B and the ignition coils 42B and 42C (the outboard motor 10 Can be set substantially the same. For this reason, the second fuel hose 63B is prevented from protruding to the rear of the outboard motor 10 and is not damaged by the engine cover 24. Therefore, the engine cover 24 can be prevented from being enlarged and downsized. .

  (2) On the top surface 32A of the head cover 32 of the engine 14, a breather chamber 64 is formed to bulge in the upper part, and a fuel filter 58 and a fuel pump 59 are installed in a lower part at a position lower than the upper part. As a result, the surroundings of the head cover 32 of the engine 14 can be made compact by installing the fuel filter 58 and the fuel pump 59, and the engine 14 can be downsized. Furthermore, since the breather chamber 64 is disposed at the top, the gas-liquid separation performance of blow-by gas can be improved.

  (3) The adjacent ignition coils 42B and 42C in which the second fuel hose 63B is disposed are disposed in the opposite direction in the vertical direction of the engine 14 so that these connector mounting portions 65 are separated from the second fuel hose 63B. As a result, it is possible to prevent interference between the connector (not shown) attached to each of the connector mounting portions 65 of the ignition coils 42B and 42C and the second fuel hose 63B.

  (4) Since the union 58A of the fuel filter 58 and the union 59A of the fuel pump 59 for connecting the second fuel hose 63B are provided facing each other, the hose length of the second fuel hose 63B is also increased from this viewpoint. Can be shortened.

  (5) Since the first fuel hose 63A is held by the coolant return hose 52 using the connector unit 66, the first fuel hose 63A can be prevented from being bent toward the engine cover 24 side. Therefore, the hose length of the first fuel hose 63A can be shortened, and the first fuel hose 63A can be prevented from coming into contact with the engine cover 24, so that the engine cover 24 can be downsized.

  As mentioned above, although this invention was demonstrated based on the said embodiment, this invention is not limited to this.

  For example, in the above embodiment, the fuel filter 58 is installed on the top surface 32A of the head cover 32. However, the fuel filter 58 may be installed on the front side of the engine 14, for example, in the vicinity of the crankcase 25. Good. In this case, the second fuel hose 63B that connects the fuel filter 58 and the fuel pump 59 is disposed linearly between the ignition coils 42B and 42C on the top surface 32A of the head cover 32, and is connected to the connector unit 66. Is held by the cooling water return hose 52 and positioned.

  In the above embodiment, the fuel hose is a fuel hose made of an elastic body such as rubber. However, a resin fuel tube, a metal fuel pipe, or the like may be used.

DESCRIPTION OF SYMBOLS 10 Outboard motor 14 Engine 24 Engine cover 32 Head cover 32A Top surface 42A, 42B, 42C Ignition coil 48 Fuel supply system 52 Cooling water return hose (cooling water piping)
58 Fuel filter 58A Union 59 Fuel pump 59A Union 60 Vapor separator 62 Fuel injector 63 Fuel hose (fuel piping)
63A First fuel hose 63B Second fuel hose 64 Breather chamber 65 Connector mounting portion 66 Connector unit

Claims (4)

A vertical multi-cylinder four-cycle engine in which a plurality of cylinders are arranged in a substantially horizontal direction and a crankshaft is arranged in a substantially vertical direction is covered with an engine cover, and a fuel filter for a fuel supply system component installed around the engine And the fuel piping arrangement structure of the outboard motor in which the fuel pump is connected by the fuel piping.
An ignition coil for each cylinder is installed in a substantially vertical direction on the top surface of the engine head cover, a fuel pump is installed on one side of the engine, and a fuel filter is installed on the other side.
A fuel pipe for connecting the fuel pump and the fuel filter is disposed in a straight line between the ignition coils adjacent to each other on the top surface of the head cover. Construction. 2. The outboard according to claim 1, wherein a top surface of the head cover is formed as a breather chamber with an upper portion bulged, and a fuel pump and a fuel filter are installed in a lower portion of the lower position of the breather chamber. The fuel piping arrangement structure of the machine. 2. The outboard motor according to claim 1, wherein the adjacent ignition coils in which the fuel pipes are disposed are installed in opposite directions so that the connector mounting portions are separated from the fuel pipes. Fuel piping arrangement structure. 2. A fuel pipe arrangement structure for an outboard motor according to claim 1, wherein a fuel pipe connection union of the fuel pump and a fuel pipe connection union of the fuel filter are provided to face each other.

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