JP4188014B2 - Cover joint structure of outboard motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a joining structure that joins and integrates a resin cover of an outboard motor divided into left and right.
[0002]
[Prior art]
  The main body of the outboard motor is made of an aluminum alloy, thereby ensuring rigidity for mounting and supporting a heavy engine on the stern. Some outboard motors use plastic parts to reduce weight and reduce costs.
  For example, in the cover constituting the engine room for housing the engine, not only the removable engine cover in the upper half of the engine room but also the cover in the lower half of the engine room is made of resin.
  When the resin is used, it is desirable to make the opening of the engine room as large as possible, that is, the joint portion between the upper half cover and the lower half cover for engine mounting work and maintenance work.
  By the way, the resin parts have lower rigidity than the aluminum alloy parts, and in particular, it is required to secure rigidity for the resinization of the lower half cover that detachably receives the upper half cover.
[0003]
  Conventionally, a technique disclosed in Japanese Patent Laid-Open No. 6-234393 has been disclosed as a resin cover for an outboard motor. In this publication, a rib configuration for ensuring the rigidity of the resin cover is disclosed. A technique for avoiding the influence of the shrinkage of the component on the outer plate member is disclosed.
[0004]
  In order to assemble the left and right resin covers, generally, a fastening structure using bolts or the like is adopted, but the assembly portion is required to have high rigidity.
  For example, US Pat. No. 4,348,194 proposes a structure for assembling a left and right divided lower cover made of resin.
[0005]
[Problems to be solved by the invention]
  In the prior art disclosed in Japanese Patent Laid-Open No. 6-234393, it is necessary to empirically confirm that the rib structure requiring thickening does not show a shrink mark on the appearance of the resin product. Therefore, it takes a lot of time and labor to commercialize the product.
  Further, in the prior art disclosed in the publication, when the rib portion of the cover forms a partition wall of the engine room in cooperation with another body part that is a mounting partner, due to the presence of the web indicated by reference numeral 148 of the publication, As a result, it is necessary to consider the drawing direction of the mold separately, or the groove indicated by reference numeral 138 is not made too deep in consideration of the draft of the rib portion.
[0006]
  In the above-mentioned U.S. Pat. No. 4,348,194, according to the prior art of the assembly structure of the left and right split type lower covers made of resin, the bracket indicated by reference numeral 26 of the same publication is replaced by two screws 27 indicated by reference numeral 27. The left and right covers indicated by reference numerals 14 and 15 are fixed.
  In this case, the cover side is required to ensure rigidity for maintaining fixation by the screw.
[0007]
  The object of the present invention is that the outboard motor cover is made of resin, the resin lower cover is divided into left and right structures, and when the left and right lower covers are joined, the joint has high joint rigidity.TheProvided is a cover joining structure for an outboard motor that can securely join and integrate a resin left and right divided type cover.
  Another object of the present invention is to improve the appearance of the resin cover of the outboard motor, while facilitating the manufacture of the resin cover and improving the degree of freedom in design including the design. Is to provide a cover joint structure for outboard motors.
[0008]
[Means for Solving the Problems]
  In order to achieve the above object, the present invention provides an engine, a propeller driven by the engine, a drive shaft for transmitting a driving force from the engine to the propeller, the engine, and the drive shaft. An outboard motor that is tiltably movable to the hull and is steerably attached to the outboard motor main body comprising case means for rotatably supporting and supporting the engine and a cover that constitutes at least a part of the engine room that houses the engine. The cover includes an upper cover, a left lower cover, and a lower starboard cover. The left lower cover and the lower starboard cover are integrally fixed to a resin outer plate member and an inner side of each outer plate member. FrameIt is composed of a plurality of upper and lower parts,Each frame includes a fixing portion that joins the outer plate members of the lower left starboard cover and the lower starboard cover,The fixing part of the upper frame of the frame includes a bolt that penetrates the frame in the left-right direction and fastens, and the fixing part of the frame other than the upper part of the frame passes through the frame in the front-rear direction. Including boltsIt is characterized by that.
[0009]
  According to the first aspect of the present invention, the frame for reinforcing the outer plate member of the resin port side lower cover and the starboard lower cover is provided with a fixing portion for joining each cover, so that the rigidity of the cover outer plate member can be secured, of course, Since the portion is provided on the frame having high rigidity, the left and right divided covers can be joined with high joining rigidity.
  In addition, when the left and right divided covers are joined and joined with bolts, bolts can be fastened by interposing a fixing portion on the joining surface of the upper and lower covers.
  In addition, when the left and right divided covers are combined for bonding and connected with bolts, no concave grooves or protrusions are formed at the mating portions of the halves, and the appearance of the joint portion of the cover outer plate member is not impaired. .
[0010]
  According to a second aspect of the present invention, in the first aspect, the frame is made of resin.
  In claim 2, the outer plate members of the left and right heel side lower covers are made of resin, and the frame is made of resin, so that the frame is easily and surely fixed and installed inside the cover outer plate member by welding or the like. be able to.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
  Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
  FIG. 1 is an explanatory cutaway side view of an essential part of an outboard motor having a cover joint structure according to the present invention, in which Fr indicates the front in the propulsion direction and Rr indicates the rear in the propulsion direction.
  The outboard motor 1 includes case means for supporting the engine and cover means for covering the engine and constituting an engine room.
[0014]
  Engine 2IsCrankshaft 2a is a vertical engine with a cylinder 2b ...(... represents a plurality. The same applies hereinafter) is a multi-cylinder engine in which a plurality of axes are arranged vertically and vertically. Pistons 2c are fitted in the cylinders 2b, and a cylinder block 2d is formed at an intermediate portion in the front-rear direction.
  A cylinder head 2e is provided behind the cylinder block 2d, a cylinder head cover 2f is provided behind the cylinder head 2d, and a crankcase 2g is provided in front of the cylinder block 2d.
[0015]
  The pump body 3 is interposed under the engine 2 described above, and the entire engine 2 is supported by the mount case 4. An oil case 5 is disposed below the mount case 4 so as to hang down.
  An exhaust manifold 2h is fixed to the cylinder head 2e, and the exhaust manifold 2h is connected to the exhaust guide 6. Further, the exhaust guide 6 is fixed to the mount case 4 and is connected to a connection hole 4 b provided in the mount case 4.
[0016]
  An oil case 5 is fixed to the lower surface of the mount case 4 so as to extend downward, and a downward exhaust passage 5b provided adjacent to the oil pan 5a of the oil case 5 communicates with the connection hole 4b. Connecting.
  As a result, the exhaust gas is led out from the combustion chamber into the extension case 13 described later via the cylinder head 2e, the exhaust manifold 2h, the exhaust guide 6, the exhaust passage 4b of the mount case, and the exhaust passage 5b of the oil case.
  A suction tube 3b hangs down from the pump body 3 into the oil pan 5a, and a strainer 3a at the lower end faces the lower portion of the oil pan 5a.
[0017]
  The longitudinal crankshaft 2a of the engine 2 is located at the front portion of the outboard motor 1 as a whole. The lower end portion of the crankshaft 2a is connected to the upper end portion of the drive shaft 7 that is vertically provided through the pump body 3 and vertically provided.
  The drive shaft 7 passes through a through hole 4c provided in the front portion of the mount case 4 via a bearing, and hangs downward through an oil pan 5a of the lower oil case 5 and a front portion of the peripheral wall 5c. The output shaft 9a arranged to face rearward is driven via the extension, transmission, and transmission mechanism 8.
  A propeller 9 disposed behind the lower end portion of the outboard motor 1 is connected to the rear end portion of the output shaft 9 a, and the drive shaft 7 is driven by the engine 2, via the transmission and transmission mechanism 8. Propulsion is obtained by driving the propeller 9.
[0018]
  In the above, the upper part, the periphery, and the lower part of the engine 2 are covered with the cover means 10 constituting a part of the outer plate member of the outboard motor.
  The cover means 10 includes an upper engine cover 11 in the form of a downward cap that covers the upper and lower middle parts to the upper part of the engine 2 in the drawing and the periphery, and opens downward, and the lower part of the engine 2 to the pump body 3. The under cover 20 is a lower cover surrounding the mount case 4 and the oil case 5.
[0019]
  As will be described later, the under cover 20 includes a left side lower cover and a right side lower cover, which are left and right cover members, and is a split type cover. As will be described later, the lower port cover and the lower starboard cover are joined and integrated by joining fixed portions provided respectively, and constitute an integrated under cover 20.
  An engine room 12 is formed on the engine cover 11 and the under cover 20. Actually, as will be described later, the engine room is configured by an upper portion defined by the mount case 4 held by the cover so as to cross the joint integrated cover of the lower left starboard cover and the lower starboard cover. And a partition is comprised with the holding | maintenance part of a port side lower cover and a starboard lower cover. This will be described in detail later.
  The engine room 12 is located in the upper part of the outboard motor 1, and the mount case 4 described above corresponds to the bottom of the engine room 12 as described later.
[0020]
  As described above, the oil case 5 is fixed to the lower side of the mount case 4. An extension case 13 formed of an aluminum alloy or the like is suspended and continuously provided below the oil case 5. A gear case 14 is provided below the extension case 13, and the lower part of the drive shaft 7, the transmission, transmission mechanism 8, and the output shaft 9 a are accommodated in the gear case 14.
  Among these, the lower part of the above-mentioned under cover 20 hangs down so that the outer side of the junction part of the mount case 4 and the oil case 5 may be covered.
[0021]
  A swivel shaft 15a is vertically provided between the front portion of the under cover 20 at the front end portion of the mount case 4 and the front portion of the extension case 13, and the stern bracket 16 is connected to the swivel case 15 via the tilt shaft 16a. To do. As a result, the outboard motor 1 is steered to the hull or the stern of the hull via the stern bracket 16.((Left and right movement) possible tilt movement(Install and support it so that it can move vertically.
  The mount case 4, the oil case 5, the extension case 13, and the gear case 14 constitute a case means.
[0022]
  FIG. 2 is a plan view in which the upper cover of the undercover 20 is removed from the outboard motor 1 and the undercover and a part of the engine are partially sectioned.
  The under cover 20 includes a left side lower cover 21 and a right side lower cover 41 constituting left and right cover members.
  Each of the covers 21 and 41 has a symmetrical blade cross-sectional shape in which the intermediate portions 21a and 41a bulge in the left-right direction in plan view.
[0023]
  By the way, the left and right lower covers are referred to as a port lower cover and a starboard lower cover in the present embodiment, but the distinction is determined based on the propulsion direction of the outboard motor 1, with the left side of the propulsion direction being port and the right side being Called starboard.
  The under cover 20 has a length in the vertical direction as shown in FIG. 1, and as is apparent from FIGS. 1 and 2 and FIG. 3 to be described later, the front and rear portions of the upper cover 21b, 21c, 41b, 41c. Bulges in the longitudinal direction of the outboard motor.
  In the lower half, the front sides 21d and 41d are provided with the swivel case 15 and the stern bracket 16, so that they are bent so as to dive backward.
[0024]
  In FIG. 2, the lower half of the engine 2 is shown as a transverse plane, and the front parts 21c and 41c of the upper parts of the covers 21 and 41 are described later with reference to FIG. In this way, it protrudes forward in a shelf shape from the upper end of the front side 21d, 41d of the lower half. During this time, unlike the rear portions 21b and 41b, a space is formed between them, and the cable support bracket 61 is disposed between the upper front portions 21c and 41c and fixed therebetween.
  The cable support bracket 61 is made of aluminum alloy or the like.TheThe rear portion is coupled to the front of the crankcase of the engine 2 and constitutes a part thereof. Details of the cable support bracket 61 and the coupling structure will be described later.
  The exhaust passage 2i of the cylinder head 2e is connected to an exhaust manifold 2h provided on the side of this side, the opposite side 2j is an intake passage, and the intake manifold is omitted. In the figure, 2k is a spark plug.
[0025]
  3 is an exploded perspective view of the porthole lower cover 21, the starboard lower cover 41, and the mount case 4. FIG. 4 is an enlarged perspective view of the main part of FIG.
  The detailed structure of each cover 21, 41 will be described in detail later.
  The port side lower cover 21 and the starboard lower cover 41 are resin molded products made of synthetic resin. For example, it is made of glass fiber reinforced plastic (polypropylene).
  The rear portions 21b and 41b of the porthole lower cover 21 and the starboard lower cover 41 are wider at the upper part in the front-rear direction than in the front part and are longer in the vertical direction as described above, and the opposite end edges 21e and 41e are abutted against each other. A rear end edge portion of the joint is formed.
[0026]
  On the other hand, the lower half portions 21f and 41f of the front portions 21c and 41c of the port lower cover 21 and the starboard lower cover 41 have a narrow width in the front-rear direction, and the front portion 21c of the port lower cover 21 is in the upper portion as described above. It extends forward in a shelf shape.
  On the other hand, the front portion 41c of the starboard lower cover 41 extends forward in a shelf shape, but is vertically cut from a predetermined portion at the rear to set the height lower than the front portion 21c and is substantially L in side view. The shape of the cut-out portion 41g, and the front end of the cut-out portion 41g is smallWidthThe front end face 41h is provided. A semicircular recess 41i is formed on the front end face 41h.
[0027]
  As is clear from FIG. 1 and the above description, the lower covers 21 and 41 of the port and starboard are shaped so that the lower part droops sharply at the front part and the rear part droops gently. A long elliptical cylinder is divided into two parts, and the rear part is entirely joined to the joined rear edge parts 21e and 41e and joined as described later.
  Further, the front part is joined by abutting the opposite end edge parts 21j and 41j of the lower half parts 21d and 41d.
  The upper front portions 21c and 41c described above are in a joined state of the port and starboard lower covers 21 and 41, and a cable support bracket 61 is disposed therebetween and coupled as described later.
  Thereby, the width direction intermediate part of the front part of the under cover 20 in front of the engine 2 is configured.
[0028]
  In addition, a separate cover 65 is overlapped and coupled on the L-shaped shelf-shaped notch 41g protruding in front of the starboard lower cover 41.
  The front end surface 65a of the separate cover 65 is provided with a circular recess 65b having a symmetrical shape corresponding to the recess 41i.
  By the way, the separate cover 65 is placed on the notch 41g and joined and integrated to form a circular through-hole 66 between the front end faces 65b and 41h. A bundled body such as a throttle cable, a shift cable, a fuel pipe, and a battery cable is passed through the through hole 66 while being held by a grommet (not shown).
  The connecting structure of the left and right front parts 21c, 41c, the separate cover 65, and the cable support bracket 61 will be described in detail with reference to FIG.
[0029]
  The mount case 4 shown in FIG. 3 is a view as seen obliquely from above and front. The connection opening 4d of the oil pan 5a described above is provided in the range of the packing surface, and the vertical through hole 4c is provided.
  A flange 4e that forms a part of the bottom of the engine room is provided on the outer wall of the mount case 4 so as to protrude from the peripheral edge. The flange 4e has a low rear portion and a high front portion, and an intermediate portion in between is shaped so as to be inclined rearward.
[0030]
  A sealing material 17 is attached to the flange 4e of the mount case 4 so as to surround the outer peripheral edge portion thereof. A seal material 17 provided so as to surround the outer peripheral edge of the flange 4e is brought into contact with or engaged with a part of a reinforcing frame provided on inner surfaces of the left and right heel side lower covers 21, 41 described later. Match.
  A partition partitioning the engine room is constituted by the flange 4e at the periphery of the mount case 4 and a part of the frames provided inside the left and right heel side lower covers 21 and 41 that contact or engage with the flange 4e.
[0031]
  FIG. 5 is a side view of the inside of the lower port cover 21, FIG. 6 is a plan view of the same, and FIG.
The porthole lower cover 21 will be described in detail below with reference to these drawings.
  A flange 22 that forms a narrow seal surface that abuts the lower end edge of the engine cover 11 that is the upper cover is integrally formed at the upper end of the lower port cover 21, and the flange 22 is formed on the lower cover 21. It is formed so that the upper end is full in the front-rear direction.
  As shown in FIG. 7, an upright piece 22a is integrally provided at the intermediate portion in the width direction of the flange 22, and the inner surface 21k of the cover 21 on the bottom surface of the flange 22a is used for reinforcement over the entire length in the front-rear direction. The upper horizontal frame 23 is fixedly installed. The upper horizontal frame 23 is linear and arranged horizontally.
[0032]
  Further, a reinforcing lower lateral frame 24 is fixedly installed in the front-rear direction at an intermediate portion in the height direction of the inner side surface 21k of the cover 21. The lower horizontal frame 24 is arranged such that the rear portion 24a is at a lower position, the front portion 24c is at an upper position, and the intermediate portion 24b is gently inclined rearward and downward.
  Front part 24 of lower horizontal frame 24cIs arranged along the lower end portion of the upper front portion 24c described above, and as shown in FIG. 6, the intermediate portion 24b protrudes inwardly and has a large width, and the widths of the front and rear portions 24c and 24a are large. Is narrow.
  A U-shaped groove 25 that contacts or engages with the sealing material 17 attached to the peripheral flange 4e of the mounting case 4 is opened inward at the inner end of the lower horizontal frame 24 described above. Is formed.
[0033]
  A vertical frame that vertically connects the upper and lower horizontal frames 23 and 24 is fixed to and integrated with the inner side surface 21k.
  As shown in FIG. 5, the vertical frame includes a rear part 26, an intermediate front part 27, an intermediate rear part 28, and a substantially rear part 29. These vertical frames 26, 27, 28, and 29 are integrally joined to the upper and lower horizontal frames 23 and 24 at the upper and lower ends. In the embodiment, all or part of the vertical frame is formed integrally with the horizontal frame.
  Further, a sub horizontal frame 30 is disposed from an intermediate portion in the vertical direction of the rear vertical frame 26 to an inner surface of the rear portion 21 b of the cover 21.
[0034]
  Each of the frames 23, 24, 26 to 30 has a rectangular hollow cross section as shown in FIG.
  The frame is softer in consideration of formability than the cover, but is selected from those having a high overall strength because it has a small rectangular cross section, and is made of, for example, polypropylene.
  The fixing of the frame to the inner surface 21k of the cover 21 is, for example, vibration welding or the like, and the welding method is not limited to this, and may be fixed integrally by adhesion.
[0035]
  At the rear end portions of the horizontal frames 23, 24 and 30 at the upper and lower and intermediate portions, the fixing portions constituting the joint portions of the left and right divided covers((Coupling portions) 31, 32, and 33 are integrally provided.
  The fixing portion 31 at the rear end of the upper horizontal frame 23 is configured to be fastened with bolts in the vertical direction, and will be described in detail later.
  The fixing portion 32 of the intermediate horizontal frame 30 and the fixing portion 33 of the lower horizontal frame 24 are configured to be fastened through bolts in the front-rear direction, and will be described in detail later.
  Further, coupling portions 34 are provided in front of and behind the lower end portion of the lower half 21f.
[0036]
  As clearly shown in FIG. 7, the outer surface of the rear portion 21 b of the porthole lower cover 21(On the rear surface), a substantially U-shaped recess 21n that opens in the direction of the joining edge 21e when viewed from the rear is provided on the upper portion facing the joining edge 21e.
  A long seat surface 35 is provided in the vertical direction so as to surround the upper side and the lower side of the recess 21n. The seating surface 35 is provided with mounting holes 35a and 35a on the upper and lower ends of the end portion, and a seal lid that also serves as a lid for an opening described later is attached.
[0037]
  8 is a side view of the inside of the starboard lower cover 41, FIG. 9 is a plan view of the same, and FIG. 10 is a rear view showing a part thereof broken away.
  The starboard lower cover 41 will be described in detail below with reference to these drawings.
  At the upper end of the starboard lower cover 41, a flange 42 that forms a narrow sealing surface that contacts the lower end edge of the engine cover 11 is formed integrally with the upper end of the lower cover 41. It is formed to fill the front and rear direction.
  As shown in FIG. 10, an upright piece 42a is integrally provided at the intermediate portion in the width direction of the flange 42. The lower surface of the flange 42a is provided on the inner side surface 41k of the cover 41 for reinforcement over the entire length in the front-rear direction. The upper horizontal frame 43 is fixed horizontally and installed.
[0038]
  A reinforcing lower horizontal frame 44 is installed in the height direction intermediate portion of the inner side surface 41k of the cover 21 in the front-rear direction in the same manner as described above. The frame 44 is disposed such that the rear portion 44a is at a lower position, the front portion 44c is at an upper position, and the intermediate portion 44b is gently inclined rearward and downward.
  The rear portion 44a of the lower horizontal frame 44 is disposed along the lower end portion of the upper front portion 44c described above. As shown in FIG. 9, the intermediate portion 44b protrudes inwardly and has a large width. The widths of the portions 44c and 44a are narrow.
  At the inner end of the lower horizontal frame 44 described above, a U-shaped groove 45 that contacts or engages with the sealing material 17 attached to the peripheral flange 4e of the mount case 4 is formed so as to open inward. This is the same as described above.
[0039]
  A vertical frame that vertically connects the upper and lower horizontal frames 43, 44 is fixed to and integrated with the inner side surface 41k. As shown in FIG. 8, the vertical frame includes a rear one 46, an intermediate front one 47, and a rear one 49. The vertical frames 46, 47 and 49 have the upper and lower ends described above. The upper and lower horizontal frames 43 and 44 are joined and integrated in the same manner as described above.
  Further, a sub horizontal frame 50 is disposed from an intermediate portion in the vertical direction of the rear vertical frame 46 to an inner surface of the rear portion 41 b of the cover 41.
[0040]
  Each of the frames 43, 44, and 46 to 50 has a rectangular hollow cross section as shown in FIG.
  The frame is softer than the cover in consideration of formability. However, since the cross section is a rectangular cross section, a frame having a high overall strength is selected. For example, the frame is made of polypropylene, which is the same material.
  The frame is fixed to the inner surface 41k of the cover 41 by, for example, vibration welding or the like, and the welding method is not limited to this, and may be fixed integrally by adhesion.
[0041]
  At the rear end portions of the horizontal frames 43, 44 and 50 in the upper and lower and intermediate portions described above, a fixing portion constituting the joint portion of the left and right divided cover(Coupling portions) 51, 52, and 53 are integrally provided.
  The fixing portion 51 at the rear end of the upper horizontal frame 43 is configured to be fastened with bolts in the vertical direction, which will be described in detail later. The fixing portion 52 of the intermediate horizontal frame 50 and the fixing portion 53 of the lower horizontal frame 44 are configured to be fastened through bolts in the front-rear direction, which will be described in detail later.
  Further, coupling portions 54 are provided in front of and behind the lower end portion of the lower half 51f.
[0042]
  As clearly shown in FIG. 10, the outer surface of the rear portion 41b of the starboard lower cover 41(A substantially U-shaped recess 41n that opens in the direction of the joining edge 41e when viewed from the rear is provided in the upper part facing the joining edge 41e on the rear surface.
  A seat surface 55 that is long in the vertical direction is provided so as to surround the upper side and the lower side of the recessed portion 41n, and the seat surface is provided with mounting holes 55a and 55a on the upper and lower sides of the end portion. Attach the double seal lid.
[0043]
  FIG. 11 is a plan view of the under cover 20 that is formed by joining the lower starboard lower cover 21 and the right starboard lower cover 41 at the fixing portion described above.
  The joining edge portions 21e and 441e of the rear portions 21b and 41b of the left and right heel side lower covers 21 and 41 are abutted, and the fixing portions 31 and 51, the fixing portions 32 and 52, and the fixing portions 33 and 53 are stacked vertically and back and forth. They are combined, fastened with bolts, and joined, and the rear portions of the covers 21 and 41 are joined and integrated.
[0044]
  The front portions 21c and 41c of the lower left side cover 21 and the lower right side cover 41 have a cable support bracket 61 interposed between the shelf-shaped portions, and the front portions 21c and 41c and the cable support bracket 61 are connected by bolts 70. Combine and unify the front part. Details of this will be described later.
  By the way, the lower half portions 21f, 41f of the left lower cover 21 and the lower right cover 41 are shown by chain lines extending downwardly below the under cover 20 through the front and rear connecting portions 34... 54. Fastened to the top of the extension case 13.
[0045]
  FIGS. 12 to 14 (a) to (c) are diagrams showing a fastening structure with a fixing portion at the uppermost part of the joining end edge of the rear part of the lower left side cover 21 and the lower right side cover 41, and FIG. FIG. 13 is a perspective view of the assembled state, FIG. 14A is a cross-sectional view taken along line 14-14 of FIG.(b)And (C) is another embodiment.
  The uppermost fixing portions 31 and 51 are provided with shelf-like pieces 31a and 51a extending in the horizontal direction. One of the shelf-like pieces 31a has a vertical mounting hole 31b, and the other 51a has a cylindrical shape. A nut 51b is buried vertically. This is shown in FIG.
  The shelf-like pieces 31a and 51a are stacked one above the other, and the bolt 70 is screwed through the mounting hole 51b and the nut 51b from above, and the fixed portions 31 and 51 are joined to each other, and these parts are joined and integrated. The coupling state is shown in FIG. 13, and this cross section is shown in FIG.
[0046]
  FIG. 14B shows another embodiment, and the same reference numerals are given to the components of the left lower lid cover 21 and the lower right star cover 41, and the description thereof will be omitted.
  As described above, the fixing portions 31 and 51 are overlapped with each other and fastened with bolts, but a cylindrical nut 151b without a flange is vertically passed through the shelf-like piece 51a of the lower fixing portion 51. The upper end portion 151b 'of the nut 151b is brought into contact with the lower end portion of the large-diameter neck portion 70a of the stepped bolt 70 that is threadedly engaged with the nut. The fixing part 51 was not crushed.
[0047]
  FIG. 14C similarly shows another embodiment, and the same reference numerals are given to the constituent parts of the left lower lid cover 21 and the lower right star cover 41, and description thereof will be omitted.
  A nut 251b provided with upper and lower flanges 251a and 251c on the shelf-like piece 51a of the lower fixing portion 51 is crimped so that the shelf-like piece 51a is sandwiched between the flanges 251a and 251c.
  The upper flange 251a has an upper surface flush with the upper surface of the shelf-like piece 51a, vertically passes through the shelf-like piece 31a of the upper fixing portion 51, and a nut on the lower end portion of the large-diameter neck portion 70a of the stepped bolt 70 screwed to the nut. The upper end portion 251b ′ of 251b was brought into contact with the resin-made fixing portion 51 so as not to be crushed.
[0048]
  FIGS. 15A to 15C are cross-sectional plan views of three main embodiments showing the fastening structure by the lowermost fixing portion of the joining edge portion of the rear portion of the lower left side cover 21 and the lower right side cover 41. It is.
  As shown in FIG. 15A, the fixing portions 33 and 53 are integrally provided at the end portions of the lowest frames 24 and 44 so as to protrude from the joining edge portions. , 53 are provided with projecting pieces 33a, 53a having longitudinal surfaces. One projection piece 33a is provided with a mounting hole 33b in the front-rear direction, and a cylindrical nut 53b is embedded in the other projection piece 53a with the axis line in the front-rear direction.
  The projecting piece portions 33a and 53a are overlapped in the front-rear direction, the bolt 72 is screwed and inserted, the fixed portions 33 and 53 are joined to each other, and these portions are joined and integrated.
[0049]
  FIG. 15B shows another embodiment, and the same reference numerals are given to the components of the left lower lid cover 21 and the lower right star cover 41, and the description thereof will be omitted.
  As described above, the fixing portions 33 and 53 are overlapped on the front and rear and fastened with bolts, but the cylindrical nut 153b without a flange is moved forward.SolidA nut 153b is fixed to the lower end of the large-diameter neck 72a of the stepped bolt 72 that is vertically fixed to the protruding piece 53a of the fixed portion 53, passes through the protruding piece 33a of the rear fixed portion 33, and is screwed with the nut. The upper end portion 153b ′ of the resin is brought into contact with the resin so that the resin-made fixing portion 51 is not crushed.
[0050]
  FIG. 15C similarly shows another embodiment, and the same reference numerals are given to the components of the left lower lid cover 21 and the lower right star cover 41, and the description thereof will be omitted.
  A nut 253b provided with upper and lower flanges 253a and 253c on the projecting piece 53a of the front fixing section 53 is tightened so that the projecting piece 53a is sandwiched between the flanges 253a and 253c.
  The upper flange 253a has an upper surface flush with the upper surface of the shelf-like piece 53a, and passes through the protruding piece portion 53a of the rear fixing portion 53, and is screwed onto the lower end portion of the large-diameter neck portion 72a of the stepped bolt 72 screwed into the nut. The upper end portion 253b ′ of 253b is brought into contact with the resin fixing portion 53 so as not to be crushed.
[0051]
  By the way, although it is the fixing | fixed part 32 and 52 of the intermediate part between the uppermost fixing | fixed part 31 and 51 and the lowest-order fixing | fixed part 33 and 53, this fixing | fixed part 32 and 52 is fixed by bolting in the front-back direction. Part.
  Therefore, they are combined and joined together in the same manner as in FIG. 15 described above.
[0052]
  FIG. 16 is an explanatory diagram for attaching a lid to the rear portion of the undercover 20 integrated after contact.
  The recesses 21n and 41n described above are formed with a substantially rectangular opening 80 that is long in the left-right direction by joining and integrating the left and right heel side lower covers 21, 41.
  With the opening 80 opened as shown in the drawing, a tool is inserted into the rear portion of the under cover 20 at the bottom of the engine room 12 to perform maintenance such as repair, cleaning, or replacement of the plug cap and spark plug. Was set as follows.
[0053]
  In the figure, reference numeral 81 denotes a lid, which is formed of rubber or resin, and is provided so that a hinge 85 crosses between an upper portion 81b and a lower half portion 81a of the outer surface, and a lid portion 86 is formed by the upper portion 81b. A rectangular frame-shaped seal 83 that engages with the opening 80 is provided on the back surface of the plate.
  Further, locking protrusions 82 are provided on the periphery of the back surface of the lid 81 so as to be engaged with mounting holes 35a, 55a,. . A seal lip 84 is provided on the back surface so as to avoid the locking projections 82.
[0054]
  The lid 81 engages with the locking projections 82... In the mounting holes 35 a... 55 a provided in the seating surfaces 35 and 55, and engages the seal 83 of the lid 86 with the opening 80 to seal it. Further, the seal lip 84 surrounds the opening 80 and seals by contacting the peripheral portions of the seating surfaces 35 and 55.
  This portion including the fastening portion of the fixed portion is sealed with the seal of the seat surfaces 35 and 55 by the seal lip 84.
[0055]
  The fixing structure of the front part of the left and right heel side lower covers 21 and 41 will be described. FIG. 3 is an exploded perspective view of the whole, FIG. 4 is a perspective view of a part of the front part, and FIG. It is a front view of the principal part which shows the state which joined and integrated the front part and the cable support bracket 61.
  This will be described in detail with reference to these drawings.
  As described above, the separate cover 65 is overlapped and coupled to the shelf-shaped substantially L-shaped notch 41 g in the front of the starboard lower cover 41. The separate cover 65 includes a fixed portion 68 at the front end and a fixed portion 67 at the rear end.
  Further, a fixing portion 36 is provided integrally with the front end portion of the upright piece 22a at the front end portion of the front portion 21c of the porthole lower cover 21.
[0056]
  The cable support bracket 61 has fixing portions 62, 6 at the upper and lower ends of the left and right sides.2, 63, 63 are provided.
  On the other hand, fixing parts 36 and 37 are provided above and below the abutting part of the port side cover 21 and a fixing part 57 is provided below the abutting part of the starboard lower cover 41.
[0057]
  The upper and lower fixing portions 62 and 63 on the right side in FIG. 17 of the cable support bracket 61 are fastened to the upper and lower fixing portions 36 and 37 on the front portion of the left underside cover 21 via lateral bolts 74 and 74.
  Further, the upper and lower fixing portions 62 and 63 on the left side of the cable support bracket 61 and the upper one 62 are fastened to the fixing portion 68 of the separate cover 65 via a lateral bolt 74.
  The lower fixing portion 63 is fastened to the fixing portion 57 provided at the lower portion of the front portion 41 c of the starboard lower cover 41 with a lateral bolt 74.
[0058]
  By the way, the fixing part 67 at the rear part of the separate cover 65 is fastened to a fixing part (not shown) provided at the front part of the notch part 41g of the front part 41c of the starboard lower cover 41 with a vertical bolt 73.
  As described above, the cable support bracket 61 and the separate cover 65 are joined and integrated with the front portions of the left and right heel side lower covers 21 and 41 to constitute the upper portion of the front portion of the under cover 20.
[0059]
  By the way, the cable support bracket 61 is integrally provided with an arm portion 61a extending in the direction of the starboard lower cover 41, and the arm portion 61a is provided with a cable receiving portion 61b curved downward.
  When the cable support bracket 61 is attached, the front of the through-hole 66 through which a bundled body such as a throttle cable, a shift cable, a fuel pipe, and a battery cable is formed by the recesses 65b and 41i between the end surface 65a and the end surface 41h of the separate cover 65. Forming a buttock for supporting
[0060]
  FIG. 18 is a cross-sectional plan view of a main part showing a coupling state between the left and right heel side lower covers 21 and 41 and the extension case 13.
  The front and rear end portions of the covers 21 and 41 are provided with fixing portions 34 and 54 that face each other to form a void. Between the voids of the fixing portions 34 and 54, the front and rear end portions of the extension case 13 are provided. A mounting boss portion 13a provided on one side is provided, and screw holes 13b and 13b are provided on the left and right side surfaces of this portion. On the other hand, bolts 75 and 75 are screwed and inserted laterally from the outside of the fixing portions 34 and 54.
  As a result, one of the front and rear portions of the left and right heel side lower covers 21 and 41 and one of the front and rear portions of the extension case 13 are joined, and both are joined and integrated.
[0061]
  19 is an enlarged cross-sectional view taken along line 19-19 of FIG.
  In the figure, the starboard lower cover 41 side is shown, and the upper horizontal frame 43 is fixed to the inner side surface 41k on the lower surface of the flange 42 at the upper end portion thereof, and a shelf-like support is provided on a part of the upper horizontal frame 43. The stay 43a is integrally protruded inward.
  Reference numeral 91 denotes a bracket made of an aluminum alloy or the like. A stay 92 is extended to the outer end of the bracket 91, and the support stay 43a is fastened with a vertical bolt 75 to be coupled.
[0062]
  A bracket 94 is provided with a stay 94 standing in an L shape at the inner end of the bracket 91, and the stay 94 is fastened to the engine 2 side with a bolt 76 and coupled. In the figure, a stay 94 of a bracket 91 is fastened and supported on the side wall of the exhaust manifold 2m as an engine side.
  An engine cover 11 is an upper cover that covers the under cover 20 in a detachable manner and constitutes the upper portion of the engine room 12.
[0063]
  A seal lip 11b is attached to the peripheral lower end 11a of the engine cover 11, and a striker 11c for positioning and locking is partially suspended and installed inside. A positioning hole 93 is provided in the bracket 91 described above, and a catcher 11d is provided below the positioning hole 93.
  The striker 11c is lowered through the positioning hole 93, engaged with the catcher 11d, and the upper cover 11 is locked to the under cover 20 side.
[0064]
  In FIG. 11, a bracket 95 is attached to the inner side of the rear portion of the porthole lower cover 21, bolts 77, 77 projecting inwardly are installed on the bracket 95, and attached to the bracket 95 on the left side of the rear portion of the engine 2. To support.
  Thereby, the left and right covers 21 and 41 are fixed to the engine side by the cable support bracket 61 on the front side and the brackets 91 and 95 on the rear side, and the rigidity of the entire cover is secured.
[0065]
  20 and 21 are views showing another embodiment of the uppermost fixing portion at the rear part of the left and right heel side lower covers, FIG. 20 is a plan view, and FIG. 21 is a view in the direction of arrow 21 in FIG. .
  In the rear portions 21b and 41b of the lower left side cover 21 and the lower right side cover 41, the front portions of the sealing flanges 22 and 42 provided with the standing pieces 22a and 42a at the upper end portions thereof are symmetrical in plan view. L-shaped, rear view(When viewed from the front, the joining edge portions 131d and 151d are vertical, and substantially triangular plate-like joining flanges 131 and 151 are provided so as to stand above the surfaces of the flanges 22 and 42, which are sealing surfaces.
[0066]
  The joining flanges 131 and 151 include joining pieces 131b and 151b that abut against the joining edges 131d and 151d. Lateral bolts 78 are screwed into the joining pieces 131b and 151b through the mounting holes 151c and nuts 131c, and the joining flanges 131 and 151 are fastened to be joined and integrated.
  In this way, the uppermost fixing portion may be fastened via the bolts in the left-right direction and joined and integrated.
[0067]
  By the way, in the above-described structure, the fixing portions 131 and 151 protrude upward from the upper surfaces of the flanges 22 and 42 which are seal surfaces.
  However, the upright pieces 22 a and 42 a are outside the joining flanges 131 and 151, and the joining flanges 131 and 151 are concealed when the upper cover 11 is put on the under cover 20.
  Therefore, while adopting a fastening structure in which the bolt is passed in the left-right direction, the fixing portion is not exposed, and the appearance is excellent.
[0068]
【The invention's effect】
  The present invention exhibits the following effects by the above configuration.
  Claim 1 supports an engine, a propeller driven by the engine, a drive shaft for transmitting driving force from the engine to the propeller, the engine, and rotatably accommodates the drive shaft, An outboard motor in which an outboard motor main body comprising case means for supporting and a cover constituting at least a part of an engine room for housing the engine is attached to the hull so as to be tiltable and steerable. And a starboard lower cover and a starboard lower cover, wherein the left starboard lower cover and the starboard lower cover are a resin-made outer plate member and a frame integrally fixed inside each outer plate member.It is composed of a plurality of upper and lower parts,Each frame includes a fixing portion that joins the outer plate members of the lower left starboard cover and the lower starboard cover,The fixing part of the upper frame of the frame includes a bolt that penetrates the frame in the left-right direction and fastens, and the fixing part of the frame other than the upper part of the frame passes through the frame in the front-rear direction. Bolts to be tightened.
[0069]
  According to the first aspect of the present invention, the frame for reinforcing the outer plate member of the resin port side lower cover and the starboard lower cover is provided with a fixing portion for joining each cover, so that the rigidity of the cover outer plate member can be secured, of course, Since the part is provided on the frame having high rigidity and the lower cover of the port side and starboard side which are divided through the connection of the fixed part are joined to each other, the joint having high rigidity can be performed.
  In addition, since the fixing portion of the frame is a joining portion, there is no need to provide the fixing portion (joining portion) on the shell-like outer plate member of the resin cover, and the outer plate member of the cover is provided while the joining and fixing portion is provided on the cover. The structure is simple, the molding is easy, and the rigidity of the outer plate member is maintained by the frame, so there is no shrinkage effect during molding as in the conventional case where ribs are integrated, and the appearance is excellent An outer cover of the outboard motor can be obtained.
  Furthermore, since a fixed part is provided on the frame, and the split cover is joined and integrated at this part, it is easy to form the fixed part (joint part), and the structure and shape of the fixed part can be arbitrarily selected easily. Each joint can be optimally configured and arranged in terms of appearance in relation to the externally exposed exterior of the exterior cover of the outboard motor.
  In addition, when the left and right divided covers are joined together and joined with bolts, the fastening parts can be tightened by interposing the fastening parts on the joining surfaces of the upper and lower covers, so that the fastening parts that are joining parts are recessed grooves. Or exposed as a protrusion.
  In addition, when the left and right split covers are joined together and joined with bolts, the frame is fixed. Since the fixed portion is penetrated and joined with the bolts fastened in the front-rear direction, it is possible to avoid the formation of concave grooves and protrusions at the mating portions of the half parts of the divided cover.
  Therefore, it is possible to avoid obvious exposure of the bolt fastening portion and the fixing portion for connection to the joint portion of the outer plate member of the split cover, and the appearance of the split cover joint portion is not impaired.
[0070]
  In claim 2, in claim 1, the frame is made of resin.
[0071]
  In claim 2, in addition to the effect of claim 1, since the outer plate members of the left and right heel side lower covers are made of resin and the frame is made of resin, on the inside of the cover outer plate member, after the production of the outer plate member The frame can be fixed and installed easily and reliably by welding or the like.
  Accordingly, the outer cover can be reinforced with a simple structure and an easy manufacturing method, and the resin frame is fixed to the inside of the outer plate member by welding or the like. Outboard motor cover with excellent appearance and no influence of shrinkage-It can be easily molded.
  Also, since the frame is made of resin and it is made of resin including the outer plate member of the cover, it is possible to reduce the weight and rationally match the conflicting demands of improved rigidity and weight reduction along with reinforcement by the frame. Can be solved.
[0072]
  Claim 3 is the claim 1, whereinThe fixing portion of the frame includes a bolt that passes through the frame in the vertical direction and is fastened.
[0073]
  In claim 3, claim 1In addition to the above effect, when the left and right divided covers are joined and joined with bolts, the fixing part of the frame is joined with the bolts that fasten in the vertical direction. It is possible to avoid the formation of concave grooves and protrusions at the mating portions of the bodies.
  Therefore, it is possible to avoid obvious exposure of the bolt fastening portion and the fixing portion for connection to the joint portion of the outer plate member of the split cover, and the appearance of the split cover joint portion is not impaired.
[0074]
  Claim 4 is claim 1In the above, the fixing portion is included in the frame portion inside the engine room in a plan view and above the mating surface in a side view with reference to the mating surface of the upper cover and the lower cover.
[0075]
  In claim 4, claim 1In addition to the effects of the above, the joint surface of the upper cover and the lower cover is provided with a joint at the frame part above the joint surface. can do.
  For this reason, while joining at a site above the mating surface, the joint site is concealed between the mating surfaces of the upper and lower covers, so that a concave groove or the like for bolt tightening does not appear on the cover outer plate member. In addition to being excellent in terms, the connecting operation is easy because the connecting portion protrudes above the mating surfaces, which is advantageous in terms of assembly of the left and right divided covers.
[Brief description of the drawings]
FIG. 1 is an illustrative cutaway side view of an essential part of an outboard motor having a cover joint structure according to the present invention.
FIG. 2 is a plan view in which the upper cover of the undercover is removed from the outboard motor and the undercover and a part of the engine are cross-sectioned
  Plan view with cross section of outboard motor at under cover
FIG. 3 is an exploded perspective view of the port bottom cover, starboard bottom cover, and mount case
4 is an enlarged perspective view of the main part of FIG.
FIG. 5 is a side view of the inside of the lower port cover.
FIG. 6 is a plan view of the same.
FIG. 7 is a rear view with a part broken away.
[Fig. 8] Side view of the inside of the starboard lower cover
FIG. 9 is a plan view of the same.
FIG. 10 is a rear view with a part broken away.
FIG. 11 is a plan view of an under cover formed by joining a lower starboard cover and a lower starboard cover at a fixing portion.
FIGS. 12 to 14 are diagrams showing a fastening structure by a fixing portion at the uppermost part of the joining edge portion of the rear portion of the lower left starboard cover and the lower right starboard cover, and FIG. 12 is an exploded perspective view before assembly.
FIG. 13 is a perspective view of the assembled state.
14 (a) is a cross-sectional view taken along line 14-14 of FIG.(b)And (C) is an enlarged sectional view showing another embodiment.
FIGS. 15 (a) to 15 (c) are cross-sectional views of three embodiments of the main part showing a fastening structure by a lowermost fixing part of a joint end edge part of a rear part of the lower left starboard cover and the lower right starboard cover; Plan view
FIG. 16 is an explanatory diagram for attaching a lid to the rear part of the under cover integrated after contact;
FIG. 17 is a view for explaining the fixing structure of the front part of the left and right heel side lower covers, and is a front view of the main part showing a state in which the front part of the cover and the cable support bracket are joined and integrated;
FIG. 18 is a cross-sectional plan view of the main part showing a coupling state between the left and right heel side lower covers and the extension case.
19 is an enlarged sectional view taken along line 19-19 in FIG.
20 and 21 are views showing another embodiment of the uppermost fixing part at the rear part of the left and right heel side lower covers, and FIG. 20 is a plan view.
21 is a view in the direction of arrow 21 in FIG.
[Explanation of symbols]
  DESCRIPTION OF SYMBOLS 1 ... Outboard motor, 2 ... Engine, 11 ... Upper cover, 7 ... Drive shaft, 3, 4, 5, 13, 14 ... Case means, 10 ... Cover means, 11 ... Upper cover which is an engine cover, 12 ... Engine Room, 21, 41 ... lower cover of port and starboard, 23, 24, 42, 43, 44 ... frame, 31, 32, 33, 51, 52, 53, 131, 151 ... fixing part, 22, 42 ... mating surface A flange constituting a sealing surface.

Claims (2)

An engine, a propeller driven by the engine, a drive shaft for transmitting a driving force from the engine to the propeller, and case means for supporting the engine and rotatably accommodating and supporting the drive shaft An outboard motor main body composed of a cover that forms at least a part of an engine room that houses the engine can be tilted to the hull, and can be steered.
The cover is composed of an upper cover, a porthole lower cover, and a starboard lower cover,
The port under cover and starboard lower cover includes an outer plate member made of tree butter, is integrally fixed to the inner side of the outer plate member, a plurality provided frame up and down,
Each frame includes a fixing portion that joins the outer plate members of the lower left starboard cover and the lower starboard cover,
The fixing portions provided at the front of the top frame of each frame is fastened by bolts in the lateral direction via the bracket,
Of each frame, a frame other than the top, rear portion of the fixing portions of the frame is fastened by bolts in the front-rear direction,
A cover joining structure for an outboard motor.   The cover joining structure for an outboard motor according to claim 1, wherein the frame is made of resin.

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