JPH0569872A - Shroud mounting structure for motorcycle - Google Patents

Abstract

PURPOSE:To provide a shroud mounting structure wherein cost down and improvement of building workability can be contrived by eliminating necessity for a stay of exclusive use for mounting a shroud. CONSTITUTION:In the case of a motorcycle in which a shroud 40 for introducing cooling air to an engine 20 is provided in the front of a fuel tank 15 arranged above the engine 20, a shroud mounting structure of the motorcycle is characterized by previously performing subassembly of an inner panel 41 of covering the front of the shroud 40 therewith and mounting the shroud 40 on the fuel tank 15 from sideward and the inner panel 41 on a vehicle body from the front.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shroud mounting structure for introducing cooling air to an engine in a motorcycle.

[0002]

2. Description of the Related Art A shroud provided on a motorcycle is extended to the left and right in order to collect air from the front and introduce it into the engine during traveling. To attach such a shroud to a vehicle body, the shroud and the vehicle body which have been conventionally extended are attached. There was a large dedicated stay that was connected to support the shroud (Japanese Patent Application No. 3-81566).

[0003]

[Problems to be Solved] Since a large dedicated stay must be provided in order to support the shroud that juts out to the left and right in the vehicle body while maintaining a predetermined positional relationship, the cost is increased and the assembly is troublesome. ..

The present invention has been made in view of the above points.
The purpose is to provide a shroud mounting structure that can reduce costs and improve assemblability.

[0005]

In order to achieve the above object, the present invention is directed to a motorcycle provided with a shroud for introducing cooling air into the engine in front of a fuel tank arranged above the engine. An inner panel covering the front of the shroud is assembled beforehand with the shroud, the shroud is attached to the fuel tank from the side, and the inner panel is attached to the vehicle body from the front to provide a motorcycle shroud attachment structure.

Since the inner panel is assembled into the shroud in advance and attached to the vehicle body or the fuel tank, it is easy to assemble.

By attaching the inner panel to the vehicle body frame and the fuel tank, it is not necessary to use a dedicated stay, and the cost can be reduced.

By attaching the shroud and the inner panel to the fuel tank on the seam flange portion of the fuel tank, the appearance of the fuel tank when the shroud is removed can be improved.

[0009]

[Embodiment] An embodiment of the present invention shown in FIG. 1 to FIG.

FIG. 1 is an overall side view of a motorcycle 1 of this embodiment. While one main pipe 3 extends slightly downward from the upper rear side of the head pipe 2,
A down pipe 4 extends obliquely downward from a lower portion of a rear side surface of the head pipe 2, and a reinforcing stay 5 is installed between the main pipe 3 and the down pipe 4.

From the rear end of the main pipe 3, a pair of left and right center pipes 6 extend obliquely downward,
The left and right lower pipes 7 and the lower end of the down pipe 4 are connected by a pair of left and right lower pipes 7 to form a vehicle body frame.

A pair of left and right front forks 8 are pivotally supported on the head pipe 2, and a front wheel 9 is pivotally supported on the lower end thereof. The front of the head pipe 2 is covered with a head cowl 10,
A handle 11 is provided above the head pipe 2 so as to expand to the left and right. Left and right seat rails 12 extend rearward from the upper portion of the center pipe 6, and the seat rails 12
A backstay 13 is connected between the lower part of the center pipe 6 and the lower part of the center pipe 6.

A fuel tank 15 is mounted on the main pipe 3 so as to extend from above, and a seat 16 is provided behind the fuel tank 15 and supported by a seat rail 12. Bracket provided on the bent portion of the center pipe 6
The front end is pivotally supported by 17 and the rear fork 18 extends rearward,
A rear wheel 19 is pivotally supported at the rear end.

An engine 20 is disposed with its front and rear portions supported by a down pipe 4 and a center pipe 6, and an exhaust pipe 22 extends from the front side surface of a cylinder 21 of the engine 20, and the exhaust pipe 22 is curved to the right of the vehicle body. Is connected to the muffler 23 facing backwards. A carburetor 24 is provided behind the cylinder 21, and an air cleaner 25 is provided behind the carburetor 24.

In the motorcycle 1 as described above,
A shroud 40 is provided on the left and right front sides of the fuel tank 15 so as to project to the left and right, and together with an inner panel 41 covering the front of the shroud 40, air is collected from the front side and cooled by the engine 20 below the fuel tank 15. It guides the wind and cools the engine 20.

Hereinafter, this shroud 40, inner panel 41
The mounting structure of will be described in detail. 2 is a side view of a main part with a part omitted, FIG. 3 is a top view of the same, FIG. 4 is a bottom view of the same, and FIG.

The fuel tank 15 has an inverted U-shape when viewed from the front, with a lower part hanging down from the left and right so as to straddle the main pipe 3 from above. The fuel tank 15 having such a shape has an inner wall 15a that straddles the main pipe 3 and an outer wall 15 that covers the outer side.
The tank is formed by welding the seam flanges 15c at the outer peripheral edge of each wall together with b. A fuel filler port 15d is provided at the highest position in the center of the outer wall 15b and is covered with a fuel cap 26, and a fuel cock 27 is provided at the lowest position on the left side of the inner wall 15a.

Cylindrical brackets 28, each of which has a notch in the front and are opened at the front portions of the inner walls 15a facing each other in the left-right direction, project horizontally toward the respective directions, while the main pipe 3
Reinforcing plate 35 welded from left and right between the down pipe 4 and
A cylindrical rubber bush 29 is supported by the support shaft 30 and protrudes outward at a portion corresponding to the bracket 28 of the bracket 28.
Are fitted from the rear. Thus, the front of the fuel tank 15 is supported by the vehicle body frame via the rubber bush 29.

The inner walls of the fuel tank 15 facing each other at the rear
A bridge plate 31 is installed between 15a, a disc-shaped mounting bracket 32 is fitted in a central circular hole of the bridge plate 31, and is mounted from above from a mounting portion 33 projecting at a corresponding position of the main pipe 3. The metal fitting 32 abuts and the mounting metal fitting 32 is attached by the bolt 34 to the mounting portion 33.
And the rear of the fuel tank 15 is supported by the main pipe 3 via the bridge plate 31.

When the fuel tank 15 is mounted so as to be straddled over the main pipe 3 in such a manner that the front and rear are supported, the shroud 40 is mounted on the left and right front sides thereof.

The left and right shrouds 40 are bilaterally symmetrical, and the rear end edges 40d of the respective shrouds 40 are hooked on the left and right front end portions of the fuel tank 15,
The left and right sides of the down pipe 4 are protruded while curving forward so as to project to the left and right, and the left and right upper half portions of the down pipe 4 are covered. An inner panel 41 is stretched inside the shroud 40 to cover the front of the shroud 40. ..

The shroud 40 has a dish-like shape with its peripheral edge portion excluding the rear end edge 40d bent inward, and the inner panel 41 has an upper end edge 41a and a front end edge 41b bent outward and a front end edge. While curving backward from the bent portion of 41c to the rear end edge 41d facing inward, the lower end edge and the lower end edge of the rear end edge 41d
41c is bent rearward to form a lower wall portion 41e.

The shroud 40 and the inner panel 41 are provided with three mounting bosses 42 and three mounting recesses 43 at corresponding positions along the front end edges 40b, 41b of the shroud 40, and one shroud 40 has one upper edge 40a. A mounting recess 44 is provided,
The inner panel 41 has horizontal mounting portions 45 formed at corresponding positions.

The outer panel of the inner panel 41 is covered with the shroud 40 so that the upper edges 40a and 41a are connected to each other and the front edge 40b and
The lower end edge 40c and the outer edge 41f of the lower wall portion 41e are brought into contact with each other and the corresponding mounting boss 42 and the corresponding mounting recess 43 are screwed with the tapping screw 39 (see FIG. 7).
44 and the horizontal mounting portion 45 are screwed and tightened with stepped bolts 46 and nuts 47 (see FIG. 9), and the shroud 40 and the inner panel 41 are assembled beforehand in a small amount.

When assembled in this manner, the shroud 40
The inner panel 41 and the upper edge 40a and 41a, the front edge
40b and 41b, the lower end portion 40c, and the outer edge 41f are in contact with each other and closed, forming a space in the middle between them and the fuel tank 15 at the rear.
It has a box shape with an opening that fits in the front end of the.

A corner portion where the rear end edge 40d of the shroud 40 and the lower end portion 40c intersect is slightly bulged rearward, and a mounting boss 48 is formed at the bulged portion 40e. Also, the inner panel 41 is
Curved rearward from the front edge 41b and facing inward, the rear edge 41b
In the vicinity of d, a vertical plane perpendicular to the front-rear horizontal direction is formed, and mounting portions 49 and 50 having circular holes are formed vertically along the rear edge 41d.

On the other hand, the fuel tank 15 has a bulging portion at the front of the lower horizontal portion of the seam flange 15c that surrounds the fuel tank 15 in a side view.
15d is formed, and the bulging portion 15d has a mounting hole corresponding to the mounting boss 48 behind the shroud 40 (see FIG. 8).

A forward bulge 15e is formed at the front end of the seam flange 15c, and a bracket 52 is attached to the bulge 15e by two bolts 53 and a nut 54 (FIG. 7). reference). The bracket 52 has a shape in which a V-shaped flat plate is bent at a right angle at a curved portion, and one side portion 52a has two mounting holes for mounting the bulging portion 15e, and the other side portion. 52b has one mounting hole for mounting the inner panel 41.

The side portion 52a of the bracket 52 is brought into contact with the bulging portion 15e of the seam flange 15c from the outside, and the pad 55 is placed inside the bulging portion 15e, so that the two bolts 53 and the nut are attached.
The bracket 52 is screwed and tightened by 54 to attach the bracket 52 to the bulging portion 15e. When one side portion 52a of the bracket 52 is attached to the bulged portion 15e of the fuel tank 15, the other side portion 52a is attached.
The plate surface of 52b forms a vertical plane that is substantially perpendicular to the front-rear horizontal direction.

Next, brackets 56 are symmetrically welded to the left and right side surfaces of the rectangular tubular down pipe 4, and the brackets 56 are attached to the end portions of the support portions 56a protruding obliquely rearward from the welded portions in the left and right directions. A mounting portion 56b that is bent to form a surface substantially perpendicular to the front-rear horizontal direction is formed, and a mounting hole for mounting the inner panel 41 is formed in the mounting portion 56b.

As described above, the shroud 40 and the inner panel 41, which have been assembled in advance, are applied to the fuel tank 15 so that the front end portion of the fuel tank 15 is fitted into the rear opening of the shroud 40, and the shroud 40 is bulged rearward. The mounting boss 48 of the portion 40e is aligned with the lower bulge 15d of the seam flange 15c of the fuel tank 15, the stepped bolt 60 is inserted, and the rear portion of the shroud 40 is screwed with the nut 61 to the seam flange 15c of the fuel tank 15. Fix (see Figure 8).

The upper mounting portion 49 along the rear end edge 41d of the inner panel 41 is attached to the front seam flange 15c of the fuel tank 15, and the side surface of the bracket 52 is substantially vertical.
Insert the stepped bolt 62 that fits from the front into 52b and screw it into the nut 63 with a cap (see FIG. 7).
Is applied from the front to a mounting portion 56b of the bracket 56 protruding from the down pipe 4 and having a substantially vertical surface, and is also screwed by a stepped bolt 64 and a nut 65 (FIG. 10).

An opening 41g is formed in a portion adjacent to the mounting portion 50 in which the rear edge 41d of the inner panel 41 is bent, and the mounting portion 56b of the bracket 56 penetrates into the opening 41g and is mounted forward. 50 is screwed on (see FIG. 10).

In this way, the rear mounting boss 48 of the shroud 40 is fixed to the seam flange 15c of the fuel tank 15, the upper mounting portion 49 of the inner panel 41 is mounted on the bracket 52 fixed to the fuel tank 15, and the lower mounting portion 50 is mounted on the inner panel 41. The brackets 56 protruding from the down pipe 4 are fixedly attached to each other.

By the shroud 40 and the inner panel 41 attached to the front of the left and right fuel tanks 15, respectively,
When traveling, the air from the front is taken in and the air is guided to the engine 20 below the fuel tank 15 along the inner panel 41 to cool the engine 20.

As described above, since the shroud 40 and the inner panel 41 are assembled in advance into a box shape and the shroud 40 and the inner panel 41 are attached to the fuel tank 15 and the down pipe 4, respectively, the rigidity of the shroud member is increased. Can be prevented from being deformed, and the assemblability is extremely good.

Since the inner panel 41 is attached to the down pipe 4 via the small bracket 56, it is possible to reduce the cost, reduce the weight and improve the assemblability without requiring a large dedicated sub stay as in the conventional case. You can

The shroud 40 and the inner panel 41 are attached to the fuel tank 15 by the seam flange 15c, and there is no large sub stay.
The appearance of the fuel tank 15 is clean when the fuel tank is removed.

[0039]

According to the present invention, since the inner panel is assembled in advance in the shroud and attached to the vehicle body or the fuel tank, the assemblability is good, and the shroud and the inner panel are assembled in a small box shape. The rigidity of the shroud member can be increased and deformation can be prevented.

Since the inner panel is attached to the vehicle body frame and the fuel tank, a large dedicated stay is not required, and the cost can be reduced and the assemblability can be improved.

Attachment of the shroud and the inner panel to the fuel tank is performed at the seam flange portion,
Since no dedicated stay is required, the appearance of the fuel tank can be made cleaner when the shroud and inner panel are removed.

[Brief description of drawings]

FIG. 1 is an overall side view of a motorcycle according to an embodiment of the present invention.

FIG. 2 is a side view of a main part with a part omitted.

FIG. 3 is a top view of the same.

FIG. 4 is a bottom view of the same.

FIG. 5 is a front view showing a cross section of the same portion.

FIG. 6 is an exploded front view of the same.

7 is a sectional view taken along line VII-VII in FIG.

8 is a sectional view taken along line VIII-VIII in FIG.

9 is a sectional view taken along line IX-IX in FIG.

10 is a sectional view taken along line XX in FIG.

[Explanation of symbols]

1 ... Motorcycle, 2 ... Head pipe, 3 ... Main pipe, 4 ... Down pipe, 5 ... Reinforcing stay, 6 ... Center pipe, 7 ... Lower pipe, 8 ... Front fork, 9 ...
Front wheel, 10 ... Head cowl, 11 ... Handle, 12 ... Seat rail, 13 ... Back stay, 15 ... Fuel tank, 16 ... Seat, 17 ... Bracket, 18 ... Rear fork, 19 ... Rear wheel, 20
... engine, 21 ... cylinder, 22 ... exhaust pipe, 23 ... muffler, 24 ... carburetor, 25 ... air cleaner, 26 ... fuel cap, 27 ... fuel cock, 28 ... bracket, 29 ... rubber bush, 30 ... support shaft, 31 ... Bridge plate, 32 ... Mounting bracket,
33 ... Mounting part, 34 ... Bolt, 35 ... Reinforcement plate, 39 ... Tapping screw, 40 ... Shroud, 41 ... Inner panel, 42
… Mounting boss, 43… Mounting recess, 44… Mounting recess, 45… Mounting part, 46… Step bolt, 47… Nut, 48… Mounting boss, 49,
50 ... Mounting part, 52 ... Bracket, 53 ... Bolt, 54 ... Nut, 55 ... Match, 56 ... Bracket, 60 ... Stepped bolt, 61
... nuts, 62 ... stepped bolts, 63 ... nuts with caps,
64… Stepped bolts, 65… Nuts.

Claims (4)

[Claims] 1. In a motorcycle having a shroud for introducing cooling air to the engine in front of a fuel tank arranged above the engine, an inner panel for covering the front of the shroud is pre-assembled with the shroud, A shroud mounting structure for a motorcycle, wherein the shroud is attached to the fuel tank from the side and the inner panel is attached to the vehicle body from the front. 2. The shroud attachment structure for a motorcycle according to claim 1, wherein one of the attachment points of the inner panel is attached to a vehicle body frame and the other one is attached to a fuel tank. 3. The shroud mounting structure for a motorcycle according to claim 2, wherein the inner panel is attached to the fuel tank by attaching the inner panel to the fuel tank via a bracket. 4. The shroud mounting structure for a motorcycle according to claim 2, wherein the shroud and the inner panel are attached to the fuel tank at a seam flange portion of the fuel tank.