JP4358011B2 - Motorcycle cowl structure - Google Patents

Description

  The present invention relates to a cowl structure for a motorcycle, and more particularly, to a cowl structure for a motorcycle in which a joint end of an inner cowl disposed inside the outer cowl is joined to a joint end of an outer cowl.

2. Description of the Related Art For example, Patent Document 1 and Patent Document 2 have already known motorcycles in which a cowl of a motorcycle is made of a resin reinforced with a carbon fiber or the like woven into a sheet shape, and the strength of the cowl is increased.
JP 60-174371 A Japanese Patent Laid-Open No. 5-97082

  By the way, an inner cowl may be arranged inside the outer cowl in order to guide cooling air to a radiator etc. arranged behind the front wheel in a front cowl of a motorcycle. In the case of adopting the cowl, the inner cowl can be made lighter if it is made of fiber reinforced resin with sheet-like carbon fiber like the outer cowl, but it is due to being made of sheet-like fiber reinforced resin Thus, each of the inner cowl and the outer cowl is manufactured by press molding of the upper and lower molds. For this reason, the joint end portion has to be flat, and the joint portion of the outer cowl and inner cowl has an edge shape. End up.

  The present invention has been made in view of the above circumstances, and is intended to reduce the overall weight of the outer cowl while increasing the strength of the outer cowl. In addition, the cowl structure of a motorcycle can smoothly join the outer cowl and the inner cowl. The purpose is to provide.

In order to achieve the above object, an invention according to claim 1 is that an outer cowl is formed of a resin reinforced by sheet-like carbon fibers , and a synthetic resin injection molding is formed at a joint end of the outer cowl. A cowl structure of a motorcycle formed by joining a joint end of an inner cowl disposed inside the outer cowl ,
The inner cowl is disposed inside the front upper part of the center cowl integrally including the outer cowl, and connects between a pair of right and left air guide plate parts that guide cooling air to the radiator and the upper parts of the air guide plate parts. The connecting portion is integrally provided with a pair of left and right suction ports connected to an air intake duct communicating with the air cleaner, and the inner end of the inner cowl is bent into a substantially U shape. The portion is formed with a thin portion via a step portion, and the joint end portion of the outer cowl is overlapped with the thin portion and the tip is attached to the step portion and faces the inner cowl. it is formed as continuous one.

According to the present invention , by forming the outer cowl with a resin reinforced with carbon fibers woven into a sheet shape, it becomes possible to secure sufficient strength and reduce the weight, and further, the inner cowl can be made of a synthetic resin. By forming by injection molding, it is possible to smoothly join the outer cowl and the inner cowl so that the overall weight can be reduced and the shape of the joint with the outer cowl can be freely formed.

Also, by bending the joint end of the inner cowl formed by injection molding into a substantially U shape, the joint of the outer cowl and the inner cowl is bent outward so as not to be edged. It can be . Moreover, a thin-walled portion is formed on the substantially U-shaped joint end portion of the inner cowl via a step portion, and the joint end portion of the outer cowl overlaps with the thin-walled portion, and the tip is attached to the step portion. In this state, the outer cowl and the inner cowl can be smoothly joined to each other without any step.

Further, the inner cowl is disposed inside the front upper part of the center cowl integrally including the outer cowl, and a pair of left and right air guide plates that guide cooling air to the radiator and a connection that connects between the upper parts of the air guide plates. And a pair of left and right inlets connected to the air intake duct leading to the air cleaner are formed in the connecting portion, so that the outside air is guided to the air intake duct by the inner cowl having excellent moldability. Therefore, a pair of left and right suction ports can be formed , and cooling air can be guided to the radiator by the inner cowl .

  Embodiments of the present invention will be described below based on one embodiment of the present invention shown in the accompanying drawings.

  1 to 5 show an embodiment of the present invention. FIG. 1 is a side view of a motorcycle. FIG. 2 is a front view of FIG. 3 is a structure diagram of the fiber reinforced resin, FIG. 4 is a front view of the inner cowl, and FIG. 5 is a sectional view taken along line 5-5 of FIG.

  In FIG. 1, a motorcycle body frame F includes a head pipe 12 that supports a front fork 11 that pivotally supports a front wheel WF, and a pair of left and right main frames 13 that extend rearward and downward from the head pipe 12. ..., a pair of left and right engine hangers 14 welded to the front part of the head pipe 12 and both main frames 13 ... and extending downward from the main frame 13 ..., and a pair of left and right pivots extending downward from the rear part of the main frame 13 ... Plate 15 and a pair of left and right seat rails 16 extending rearward and connected to the rear portions of the main frames 13. The seat rails 16 are made of a vehicle body cover made of fiber reinforced resin using carbon fiber. The rear ends of the two seat rails 16 are connected to each other.

  A V-shaped engine body 17 having a front bank BF and a rear bank BR is supported at the lower part of the two engine hangers 14, the intermediate part of the main frame 13, and the upper and lower parts of the pivot plate 15. The engine body 17 is configured, for example, as a 5-cylinder having 3 cylinders in the front bank BF and 2 cylinders in the rear bank BR.

  A front end portion of a swing arm 18 is swingably supported via a support shaft 19 at an intermediate portion in the vertical direction of the pivot plates 15. The axle of the rear wheel WR is supported on the rear end portion of the swing arm 18. 20 is rotatably supported.

  The power from the output shaft 21 of the transmission built in the engine body 17 is transmitted to the rear wheel WR via the chain transmission means 22, and the chain transmission means 22 is fixed to the output shaft 20. Drive sprocket 23, driven sprocket 24 fixed to the rear wheel WR, and endless chain 25 wound around the sprockets 23, 24.

  An upper end portion of a rear cushion unit 26 is connected to the front portion of the swing arm 18, and a lower end portion of the rear cushion unit 26 is connected to lower portions of the pivot plates 15 through a link mechanism 27. The

  An air cleaner 29 is disposed above the front and rear banks BF, BR in the engine body 17 so as to be sandwiched between the main frames 13 in the vehicle body frame F, and downstream on both sides of the air cleaner 29. The intake ducts 47, to which the ends are connected, pass through the insertion holes 46 provided in both the main frames 13, and extend outside the main frames 13 forward.

  A fuel tank 30 that covers the engine body 17 from above is disposed behind the air cleaner 29, and the fuel tank 30 is supported by the seat rails 16. In addition, a battery 31 is disposed between the air cleaner 29 and the fuel tank 30. A seat 32 for seating a rider is supported on the seat rails 16 at the rear of the fuel tank 30.

  The first individual exhaust pipes 33F connected to the cylinder head 28F of the front bank BF for each cylinder extend below the engine body 17 to the rear wheel WR side, and the first individual exhaust pipes 33F. Commonly connected to the exhaust pipe 34F. The seat rail 16 supports a first exhaust muffler 35F disposed on the upper right side of the rear wheel WR, and a downstream end of the first collective exhaust pipe 34F is connected to the first exhaust muffler 35F. The second individual exhaust pipes 33R connected to the cylinder head 28R of the rear bank BR for each cylinder extend rearward through the upper portion of the rear cushion unit 26, and the second individual exhaust pipes 33R ... are second collective exhaust. Commonly connected to the pipe 34R. Further, the downstream end of the second collective exhaust pipe 34R is connected to a second exhaust muffler 35R supported by the seat rail 16.

  Incidentally, the front of the head pipe 12 is covered with a front cowl 36, and both front sides of the vehicle body are covered with a pair of left and right center cowls 37 connected to the front cowl 36, and a part of the engine body 17 and the front bank BF. A lower cowl 38 that covers the first individual exhaust pipes 33F connected to the cylinder head 28F from both sides is integrally connected to the center cowl 37. In addition, the front cowl 36, the integrated center cowl 37, and the lower cowl 38 are formed of fiber reinforced resin using carbon fibers.

  The rear portions of the two seat rails 16 are covered with a rear cowl 39 made of synthetic resin together with most of the second exhaust muffler 35R, the fuel tank 30 and the air cleaner 29 are covered with a cover 40, and a front fender that covers the upper side of the front wheel WF. 41 is attached to the front fork 11.

  A lower radiator 42 and an upper radiator 43 disposed above the lower radiator 42 are disposed in front of the engine body 17 so as to be covered from both sides by the center cowl 37.

  A side stand 45 having a stand bar 44 that can be raised and lowered is provided below the left pivot plate 15 that constitutes a part of the vehicle body frame F.

  Referring also to FIG. 2, the center cowl 37 and the lower cowl 38 that are integrally formed constitute an outer cowl 50 according to the present invention, and the lower parts of the lower cowls 38 and 38 are joined to each other.

  The outer cowl 50 is made of a resin reinforced with sheet-like carbon fibers, and as shown in FIG. 3, includes a sheet 49 formed by weaving warps and wefts of the carbon fibers 48 into a sheet shape. It shape | molds by pressing a resin sheet with a metal mold | die under heating.

  The front end edges of both outer cowls 50, 50 are formed so as to form an opening for arranging the rear upper part of the front wheel WF, and the front wheel WF is attached to the lower radiator 42 arranged behind the front wheel WF. A radiator grille 52 is provided between the front end lower portions of the outer cowls 50, 50, that is, between the front end lower portions of both center cowls 37, 37, to prevent the mud and sewage to be lifted from being adversely affected. A reservoir tank 53 common to the lower and upper radiators 42 and 43 is disposed on the right side of the lower radiator 42, and the reservoir tank 53 is covered with a center cowl 37 on the right side.

  The upper radiator 43 is disposed so as to face the upper side of the radiator grille 52 in the opening formed by the front ends of the outer cowls 50, 50. An inner cowl 51 is disposed to guide the cooling air to the upper radiator 43.

  Referring also to FIG. 4, the inner cowl 51 is formed by injection molding. The inner cowl 51 is disposed on the front upper inner side of the center cowls 37, 37 that the outer cowl 50. A pair of left and right air guide plate portions 51a and 51a for guiding the cooling air to the top and a connecting portion 51b for connecting the upper portions of the air guide plate portions 51a and 51a are integrally provided.

  Connecting plate portions 54... 55 are integrally projected at the lower portion and the upper portion of the air guide plate portions 51 a. The connecting plate portions 54... 55 are center cowls 37 in the outer cowl 50. Are attached by clips 57..., 58. Further, connecting plate portions 56 are integrally projected at both upper ends of the connecting plate portion 51b, and these connecting plate portions 56 are provided on the upper portion of the center cowl 37 and the front cowl 36 in both outer cowls 50. The connecting portion 51 b of the inner cowl 51 is connected to the lower portion of the front end of the front cowl 36.

  Referring also to FIG. 5, the front end of the center cowl 37 in the outer cowl 50 is provided with a joint end 60 to the inner cowl 51, and the joint cowl 60 has an inner cowl at the joint end 60. Joined end portions 61 provided at the front ends of the two air guide plate portions 51a provided in 51 are joined.

  The joint end portions 61 of the inner cowl 51 are formed so as to be bent in a substantially U shape toward the rear, and at the front end side of the joint end portions 61, a thin wall is provided via a step portion 61a. Each part 61b is formed.

  On the other hand, the joining end portions 60 of the outer cowls 50 are flush with the air guide plate portions 51a of the inner cowl 51 in a state where the tips of the outer cowls 50 are overlapped with the stepped portions 61a and overlapped with the thin-walled portions 61b. Slightly folded in a series.

Further, a pair of left and right suction ports 62, 62 are provided in the upper portion of the inner cowl 51, that is, the connecting portion 51b, and the suction ducts 46 connected to the air cleaner 29 are connected to the suction ports 62.

  Next, the operation of this embodiment will be described. Since the battery 31 is disposed between the air cleaner 29 disposed above the engine body 17 and the fuel tank 30 disposed behind the air cleaner 29, The heavy fuel tank 30 and the battery 31 can be concentrated in the vicinity of the engine body 17, thereby contributing to improvement in the performance of the motorcycle.

Further, the joint end portion 61 of the inner cowl 51 disposed inside the outer cowl 50 is joined to the joint end portion 60 of the outer cowl 50 formed by integrally connecting the center cowl 37 and the lower cowl 38. However, the outer cowl 50 is made of a resin reinforced with a sheet-like carbon fiber 48 , and the inner cowl 51 is formed by injection molding of a synthetic resin.

  Therefore, sufficient strength of the outer cowl 50 can be secured and the weight can be reduced, and the inner cowl 51 is formed by injection molding of a synthetic resin, thereby reducing the overall weight and the outer cowl 50. The outer cowl 50... And the inner cowl 51 can be smoothly joined so that the shape of the joining portion can be freely formed.

  Further, since the joining end portions 61 of the inner cowl 51 are formed to be bent in a substantially U shape, the joining portions of the outer cowl 50 and the inner cowl 51 are avoided to be edged. The shape can be bent in the direction.

  In addition, a thin portion 61b is formed on the joining end portion 61 ... of the inner cowl 51 via a step portion 61a, and the joining end portion 60 ... of the outer cowl 50 attaches the tip to the step portion 61a ... and the thin portion 61b. The outer cowl 50 and the inner cowl 51 can be smoothly joined to each other without any step since the outer cowl 50 and the inner cowl 51 are formed so as to be flush with the inner cowl 51 in a state where they are superposed.

  The inner cowl 51 has a pair of wind guide plates 51a and 51a for guiding cooling air to the upper radiator 43, and is formed so as to function as a wind guide to the upper radiator 43. The cooling air can be guided to the upper radiator 43 by 51.

  Further, the upper portion of the inner cowl 51 is provided with suction ports 62 connected to the intake ducts 46 connected to the cleaner 29, so that the inner cowl 51 having excellent moldability leads the outside air to the intake ducts 46. Can be formed.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. It is.

Side view of motorcycle Front view of arrow 2 in FIG. 1 with the front wheel and front fork omitted Structure diagram of fiber reinforced resin Front view of inner cowl Sectional view along line 5-5 in FIG.

29 ... Air cleaner 43 ... Radiator 46 ... Air intake duct 48 ... Carbon fiber 50 ... Outer cowl 51 ... Inner cowl
51a ... wind guide plate
51b... Connection part 60, 61 ..joint end part 61a... Step part 61b.

Claims (1)

The outer cowl (50) is formed of a resin reinforced by the sheet-like carbon fiber (48), and the joint end (60) of the outer cowl (50) is formed by injection molding of a synthetic resin. A cowl structure for a motorcycle to which a joint end (61) of an inner cowl (51) disposed inside the outer cowl (50) is joined ,
The inner cowl (51) is disposed on the front upper inner side of the center cowl (37) integrally including the outer cowl (50) and guides cooling air to the radiator (43). ) And a connecting portion (51b) for connecting the upper portions of the air guide plate portions (51a), and an intake duct (46) leading to the air cleaner (29) at the connecting portion (51b). A pair of left and right suction ports (62) connected to the
A thin end portion (61b) is formed through a stepped portion (61a) at a joint end portion (61) of the inner cowl (51) which is bent in a substantially U shape, and the outer cowl (50). The joining end portion (60) is formed to be flush with the inner cowl (51) in a state where the joining end portion (60) is superposed on the thin-walled portion (61b) and the tip is attached to the stepped portion (61a). wherein the, motorcycle cowl structure.

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