JP2011058473A - Flywheel cover attachment structure for outboard motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attach a flywheel cover on an upper surface of an engine and dispose an engine hook fixed on the upper surface of the engine at an appropriate position while preventing interference with piping, harness and the like laid out on the upper surface of the engine. <P>SOLUTION: In a flywheel cover attachment structure for an outboard motor, a flywheel 67 is joined to an engine 14 of the outboard motor having a crankshaft 28 arranged in a roughly vertical direction at an upper end part of the crankshaft 28 in such a manner that the same rotate together, and the flywheel cover 77 covering the flywheel is attached to the upper surface of the engine. In the attachment structure, the engine hook 74 for suspending the outboard motor is fixed on the upper surface of the engine, the flywheel cover 77 is fixed on the upper surface of the engine by using attachment bolts 78A, 78B, 78C at least at one section, and a projection part 82 which is another section is attached by attachably and detachably locking to a recess part provided on the engine hook 74. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

   The present invention relates to an outboard motor flywheel cover mounting structure in which a flywheel cover that covers a flywheel coupled to an upper end portion of a crankshaft disposed in a substantially vertical direction is mounted on an upper surface of an engine.

   In an engine of an outboard motor, a crankshaft is disposed in a substantially vertical direction, and a flywheel is integrally coupled to an upper end portion of the crankshaft. Further, as described in Patent Document 1, an engine hook used for suspending the outboard motor is fixed to the upper surface of the engine adjacent to the flywheel.

   In the engine described in Patent Document 1 as described above, the entire upper surface of the engine including the flywheel is covered with a flywheel cover (starter cover). The engine hook extends upward through an opening formed in the flywheel cover.

JP-A-8-99698

   By the way, many pipes and harnesses such as a fuel hose and a breather hose are arranged on the upper surface of the engine. If the flywheel cover does not cover the entire top surface of the engine, but covers only the vicinity of the flywheel, the mounting bolts that secure the flywheel cover will interfere with the piping and harnesses on the engine top surface. There is a risk that.

   Further, when one engine hook is installed on or near the extension line of the center of gravity of the outboard motor, and the flywheel cover is configured to cover only the vicinity of the flywheel as described above, the engine hook is The flywheel cover will be approached, but this cover cannot be cut out. Therefore, the engine hook needs to be arranged avoiding the flywheel cover. As a result, the engine hook may not be installed at an appropriate position for hanging the outboard motor.

   The object of the present invention has been made in consideration of the above-mentioned circumstances, and the flywheel cover can be attached to the upper surface of the engine while preventing interference with piping and harnesses disposed on the upper surface of the engine. Another object of the present invention is to provide a flywheel cover mounting structure for an outboard motor capable of installing an engine hook fixed to the upper surface of the engine at an appropriate position.

   The present invention relates to an engine of an outboard motor in which a crankshaft is arranged in a substantially vertical direction, and a flywheel is integrally coupled to an upper end portion of the crankshaft, and a flywheel cover that covers the flywheel is provided on the engine. In the flywheel cover mounting structure for an outboard motor attached to the upper surface, an engine hook for suspending the outboard motor is fixed to the upper surface of the engine, and at least one portion of the flywheel cover is the Bolts are fixed to the upper surface of the engine, and the other part is configured to be detachably locked and attached to a locking part provided on the engine hook.

   According to the present invention, at least one part of the flywheel cover is bolted to the upper surface of the engine, and the other part is detachably locked to the locking part of the engine hook. For this reason, it is possible to facilitate the attachment and detachment of the flywheel cover, and since the number of bolt fixing points of the flywheel cover is reduced, it is possible to prevent interference between piping and harnesses arranged on the upper surface of the engine and the bolt fixing points, The degree of freedom in layout of piping and the like can be increased. Further, since the engine hook is installed in the vicinity of the flywheel cover, the engine hook can be installed at an appropriate position for hanging the outboard motor.

The right view which shows the outboard motor to which 1st Embodiment in the flywheel cover attachment 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 top view which shows the engine etc. of FIG. The perspective view which shows the flywheel cover and engine hook which are shown in FIG.4 and FIG.6. The perspective view which shows the assembly | attachment state of the flywheel cover and engine hook of FIG. The top view corresponding to FIG. 6 which shows the engine etc. of the outboard motor to which 2nd Embodiment in the flywheel cover attachment structure of the outboard motor which concerns on this invention was applied.

   The best mode for carrying out the present invention will be described below with reference to the drawings.

[A] First embodiment (FIGS. 1 to 8)
FIG. 1 is a right side view showing an outboard motor to which the first embodiment of the flywheel cover mounting structure for an 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. Arranged vertically and vertically. 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. . 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. . 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 some exhaust gas in the drive shaft housing 22 to be 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.

   Now, as shown in FIG. 4, a hull-shaped flywheel 67 is coupled to the upper end of the crankshaft 28 so as to rotate together. A large-diameter ring gear 68 is fixed to the outer periphery of the flywheel 67 in a hook shape, and a plurality of permanent magnets 69 are fixed to the inner periphery of the flywheel 67. The upper surfaces of the crankcase 25 and the cylinder block 26 are located in the flywheel 67 and the stator 70 is fixed. The permanent magnet 69 and the stator 70 of the flywheel 67 constitute a flywheel magnet device 71 that functions as a generator.

   As shown in FIG. 6, a starter motor 72 for starting the engine is installed on the upper part of the engine 14 adjacent to the silencer 53 of the intake device 47. A small-diameter pinion gear 73 is provided at the motor shaft end of the starter motor 72. The pinion gear 73 protrudes toward the ring gear 68 side of the flywheel 67 and is provided so as to be able to mesh with the ring gear 68. By starting the starter motor 72, the pinion gear 73 protrudes toward the ring gear 68 and meshes with the ring gear 68. The power of the starter motor 72 is transmitted to the crankshaft 28 and the engine 14 is started.

   Further, an engine hook 74 for suspending the outboard motor 10 or the engine 14 is fixed to the upper surface of the engine 14 by using a mounting bolt 75. The engine hook 74 is on the extension line passing through the center of gravity of the outboard motor 10 or in the vicinity thereof, in the present embodiment, behind the outboard motor in the flywheel 67 and in the vicinity of the flywheel cover 77 described later. One is installed on the upper surface. When the outboard motor 10 or the engine 14 is pulled up, the engine cover 24 (FIG. 1) is removed, the engine hook 74 is exposed as shown in FIG. 4, and the lifting hook 76 is hooked on the engine hook 74. To do.

   As shown in FIG. 6, the above-described flywheel 67, ring gear 68, starter motor 72, and pinion gear 73 are covered with a flywheel cover 77 attached to the upper surface of the engine 14. The flywheel cover 77 has at least one place, and in this embodiment, three places around the flywheel 77 (attached portions 85A, 85B, and 85C) are attached to the upper surface of the engine 14 using attachment bolts 78A, 78B, and 78C. As shown in FIGS. 7 and 8, the other fixed portion (projection portion 82) is fixed to a recess 80 as a locking portion formed on the engine hook 74 via, for example, a grommet 81 as an elastic member. It is detachably locked.

   That is, as shown in FIG. 4, the mounting bolt 78A passes through the mounted portion 85A of the flywheel cover 77 and is screwed into a boss 79A formed on the crankcase 25. As shown in FIG. 2, the mounting bolt 78C passes through the mounted portion 85B of the flywheel cover 77 and is screwed into a boss 79B formed on the crankcase 25, whereby the mounting bolt 78C is further connected to the flywheel as shown in FIG. The flywheel cover 77 is bolted to the crankcase 25 and the cylinder block 26 by passing through the attached portion 85C of the cover 77 and screwing into a boss 79C formed on the cylinder block 26, respectively. The fixing direction in which the flywheel cover 77 is fixed to the upper surfaces of the crankcase 25 and the cylinder block 26 by these mounting bolts 78A, 78B, 78C is a direction parallel to the axial direction of the crankshaft 28.

   Further, as shown in FIGS. 7 and 8, the flywheel cover 77 is formed with a protrusion 82 that is locked by a grommet 81 interposed in the recess 80 of the engine hook 74. That is, the grommet 81 is inserted into the protrusion 82 and the grommet 81 is locked to the recess 80 of the engine hook 74, so that the protrusion 82 of the flywheel cover 77 is connected to the engine hook 74 via the grommet 81. The position is restricted by being locked in the recess 80. The direction of this position regulation is a direction orthogonal to the axial direction of the crankshaft 28, that is, a direction parallel to the axial direction of the cylinders 19A, 19B, 19C (FIG. 2) of the cylinder block 26. Thereby, even if the vibration accompanying the reciprocating motion of the piston (not shown) in the cylinders 19A, 19B, and 19C acts on the flywheel cover 77, the displacement of the flywheel cover 77 due to this vibration is reduced. .

   As shown in FIG. 6, the axial length L <b> 1 as the axial length of the protrusion 82 of the flywheel cover 77 is the axial length as the axial length of the grommet 81 (that is, the grommet 81 is inserted into the protrusion 82. (Length along the direction) L2 is formed larger. Thereby, even when the positions of the recess 80 of the engine hook 74 and the protrusion 82 of the flywheel cover 77 are shifted in the axial direction of the protrusion 82, the grommet 81 is reliably assembled.

   As shown in FIG. 7, the engagement position between the recess 80 of the engine hook 74 and the protrusion 82 of the flywheel cover 77 (that is, the position of the protrusion 82) is such that the engine hook 74 is attached to the upper surface of the cylinder block 26 by the mounting bolt 75. Is set to a position that is higher by a height H than a position that is fixed to (ie, a position of the mounting surface 83 of the engine hook 74 by the mounting bolt 75). This height H is the piping disposed on the upper surface of the engine 14 (crankcase 25, cylinder block 26, cylinder head 27, head cover 32), for example, the fuel hoses 63C and 63D shown in FIG. The size of the breather hose 84 or the like that extends from 64 to the silencer 53 of the intake device 47 is set to a dimension equal to or larger than the diameter.

   Here, the flywheel cover 77 is attached to the upper surface of the engine 14 at substantially equal intervals along the periphery of the flywheel cover 77 using the mounting bolts 78A, 78B, 78C and the engine hook 74 described above.

   With the configuration as described above, the following effects (1) to (6) are achieved according to the present embodiment.

   (1) The flywheel cover 77 has at least one mounted portion 85A, 85B, 85C, for example, at three locations, using the mounting bolts 78A, 78B, 78C, and the upper surface of the engine 14 (the crankcase 25 and the cylinder block 26). The other one protrusion 82 is detachably locked to the recess 80 of the engine hook 74 via a grommet 81. For this reason, the flywheel cover 77 can be easily attached and detached, and the bolt fixing points of the flywheel cover 77 can be reduced. Therefore, piping such as the fuel hoses 63C and 63D and the breather hose 84 disposed on the upper surface of the engine 14 is possible. In addition, interference between a harness (not shown) and the bolt fixing portion can be prevented, and the degree of freedom of layout of piping and the like can be increased.

   Furthermore, since it is only necessary to provide three bolt mounting bosses 79A, 79B, 79C and brackets (not shown) on the upper surface of the crankcase 25 and the cylinder block 26 of the engine 14, the weight of the engine 14 can be reduced. In addition, the number of parts can be reduced.

   (2) Since the concave portion 80 for engaging the flywheel cover 77 is formed in the engine hook 74, the engine hook 74 can be installed in the vicinity of the flywheel cover 77. As a result, the engine hook 74 can be disposed on or near the extension line of the center of gravity of the outboard motor 10, and thus the engine hook 74 can be installed at an appropriate position for hanging the outboard motor 10 or the engine 14. .

   (3) In the flywheel cover 77, the fixing direction in which the bolts are fixed to the upper surface of the engine 14 using the mounting bolts 78A, 78B, and 78C is a direction parallel to the axial direction of the crankshaft 28, and the projection 82 is a grommet The position restricting direction that is locked and restrained by the recess 80 of the engine hook 74 via 81 is a direction orthogonal to the axial direction of the crankshaft 28, that is, the axial direction of the cylinders 19A, 19B, 19C of the cylinder block 26. is there. For this reason, even if the vibration caused by the reciprocating motion of the piston (not shown) in the cylinders 19A, 19B, 19C acts on the flywheel cover 77, the displacement of the flywheel cover 77 based on this vibration (the cylinders 19A, 19B). , 19C displacement along the axial direction).

   (4) Since the projecting portion 82 of the flywheel cover 77 is locked to the concave portion 80 of the engine hook 84 via the grommet 81, the grommet 81 causes the flywheel cover 77 to vibrate due to the vibration of the engine 14. Can be absorbed and reduced.

   Further, by interposing this grommet 81, even if an assembly error occurs between the protrusion 82 of the flywheel cover 77 and the recess 80 of the engine hook 74, the grommet 81 can absorb this error. The tolerance for the assembly of the protrusion 82 and the recess 80 can be expanded.

   (5) The locking position between the recess 80 of the engine hook 74 and the protrusion 82 of the flywheel cover 77 (that is, the position of the protrusion 82) is higher on the upper surface of the engine 14 than the position of the mounting surface 83 of the engine hook 74. The height H is set to be equal to or larger than the diameter of the pipes disposed in the pipe. As a result, it is possible to prevent the engagement portion between the recess 80 of the engine hook 74 and the protrusion 82 of the flywheel cover 77 from interfering with the piping on the upper surface of the engine 14.

   (6) The axial length L1 of the protrusion 82 of the flywheel cover 77 is set to be larger than the axial length L2 of the grommet 81 inserted through the protrusion 82. For this reason, even when the position of the recess 80 is displaced in the axial direction of the protrusion 82 of the flywheel cover 77 due to deformation of the engine hook 74 or the like, and when the position of the protrusion 82 itself is changed in the axial direction, By moving the grommet 81 in the axial direction of the protrusion 82, the protrusion 82 of the flywheel cover 77 can be suitably assembled to the recess 80 of the engine hook 74 via the grommet 81.

[B] Second embodiment (FIG. 9)
FIG. 9 is a plan view corresponding to FIG. 6 and showing the engine of the outboard motor to which the second embodiment of the flywheel cover mounting structure for the outboard motor according to the present invention is applied. In the second embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description is simplified or omitted.

   The second embodiment is different from the first embodiment in that the flywheel cover 86 is not only the flywheel 67 but also fuel hoses 63C and 63D disposed on the upper surface of the engine 14, and a breather. This is a point that covers substantially the entire upper surface of the engine 14 including the hose 84 and the cooling water return hose 52.

   In the flywheel cover 86, an opening 87 through which the engine hook 74 passes is formed at a central position along the longitudinal direction (the longitudinal direction of the outboard motor 10). The flywheel cover 86 faces the opening 87, and a protrusion 82 projects toward the opening 87 from a position near the center line 88 in the left-right direction on the upper surface of the engine 14 at the rear of the outboard motor of the flywheel 67. Has been. Therefore, the protrusion 82 is provided at a substantially central position in the longitudinal direction of the flywheel cover 86 and in the left-right direction orthogonal to the longitudinal direction. This projection 82 is engaged with the recess 80 of the engine hook 74 via the grommet 81 as in the above embodiment.

   In this flywheel cover 86, the front side of the outboard motor is mounted by the mounting bolts 78A and 78B, the right side of the longitudinal center position is mounted by the mounting bolt 78C, and the rear side of the outboard motor is mounted by the mounting bolts 89A and 89B. It is bolted to the upper surface of Further, in the flywheel cover 86, the substantially central position in the longitudinal direction and the left-right direction is locked to the concave portion 80 of the engine hook 74 using the protrusion 82 and the grommet 81.

   In the second embodiment, the same effects as the effects (1) to (6) of the first embodiment are exhibited, and the following effect (7) is also achieved.

   (7) A protrusion 82 is formed at a substantially central position in the longitudinal direction and the left-right direction of the flywheel cover 86, and the protrusion 82 is engaged with the recess 80 of the engine hook 74 via the grommet 81. The portion of the flywheel cover 86 having a lower rigidity is locked by the engine hook 74. Therefore, the rigidity of the flywheel cover 86 is ensured, and vibrations thereof can be reduced, and damage to the flywheel cover 86 can be prevented.

   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-described embodiments, the case where the engine hook 74 is installed on the upper surface of the engine 14 is described as a single unit. However, the engine hook 74 surrounds an extension line passing through the center of gravity of the outboard motor 10, A plurality of, for example, two, may be installed on the upper surface of the engine 14 outside the flywheel 67, and the outer periphery of the flywheel cover 77 or 86 may be partially detachably locked by the respective engine hooks 74. In this case, the flywheel cover 77 or 86 can be attached or detached more easily by increasing the position where the flywheel cover 77 or 86 is detachably locked.

DESCRIPTION OF SYMBOLS 10 Outboard motor 14 Engine 28 Crankshaft 67 Flywheel 78A, 78B, 78C Mounting bolt 80 Recessed part (locking part)
81 Grommet (elastic member)
82 Projection 83 Mounting surface 86 Flywheel cover L1, L2 Axial length H Height

Claims (8)

In an engine of an outboard motor in which a crankshaft is arranged in a substantially vertical direction, a flywheel is integrally coupled to the upper end of the crankshaft, and a flywheel cover that covers the flywheel is attached to the upper surface of the engine. In the outboard motor flywheel cover mounting structure,
An engine hook for suspending the outboard motor is fixed to the upper surface of the engine,
The flywheel cover is configured such that at least one portion is bolted to the upper surface of the engine and the other portion is detachably locked to a locking portion provided on the engine hook. An outboard motor flywheel cover mounting structure.  In the flywheel cover, the fixing direction in which the bolt is fixed is a direction parallel to the crankshaft, and the position regulating direction in which the position is regulated by being latched by the latching portion of the engine hook is a direction perpendicular to the crankshaft. The flywheel cover mounting structure for an outboard motor according to claim 1.  2. The flywheel cover mounting structure for an outboard motor according to claim 1, wherein the engine hook is a single engine hook installed on or near an extension line passing through the center of gravity of the outboard motor.  2. The outboard motor fly according to claim 1, wherein an elastic member is interposed between the locking portion of the engine hook and the protrusion of the flywheel cover locked by the locking portion. Wheel cover mounting structure.  2. The ship according to claim 1, wherein a locking position between the locking portion of the engine hook and the flywheel cover is set to a position higher than a fixing position where the engine hook is fixed to the upper surface of the engine. The flywheel cover mounting structure of the outer unit.  An elastic member is inserted into the projecting portion of the flywheel cover, the elastic member is engaged with the engaging portion of the engine hook, and the axial length of the projecting portion is set larger than the axial length of the elastic member. The flywheel cover mounting structure for an outboard motor according to claim 4.  The flywheel cover is configured to cover substantially the entire upper surface of the engine including the flywheel, and a substantially central position in the longitudinal direction of the flywheel cover is locked to a locking portion of an engine hook. The flywheel cover mounting structure for an outboard motor according to claim 1.  2. The outboard motor flywheel cover according to claim 1, wherein a plurality of the engine hooks surround an extension line passing through the center of gravity of the outboard motor and are fixed to the upper surface of the engine around the flywheel. Mounting structure.

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