JP3701667B2 - Body cover structure for motorcycles - Google Patents

Description

  The present invention relates to a vehicle body cover structure for a motorcycle.

  As a body cover structure for a motorcycle, various types of covers that cover the inside of the motorcycle have been put to practical use. The body cover structure of a practical motorcycle was sufficient in practice if the necessary parts were specified and covered.

As such a vehicle body cover structure for a motorcycle, one having the appearance of a functional member of a motorcycle is known (for example, see Patent Document 1).
Japanese Patent Laid-Open No. 10-273083 (FIGS. 1 to 5)

  According to FIG. 1 of the publication, the conventional technique is to cover the vehicle body with a vehicle body cover 10 (numbers quoted those described in the publication; the same applies hereinafter). Further, according to FIGS. 2 and 5 of the publication, a pair of left and right cylindrical openings 21 and 21 resembling an air duct are formed in the cover member 11 constituting the vehicle body cover 10.

By the way, in general, an air passage formed of a cylindrical air duct is often integrally formed in a body cover of a motorcycle in order to cool an engine, a radiator, and the like. The engine and radiator are cooled by outside air taken in from the air duct.
However, depending on the structure of the vehicle body cover, a complicated and large molding die is used to integrally form the cylindrical air duct, which causes an increase in cost. If a simple and small molding die is used in order to eliminate such a point, the shape and position of the air duct are limited, so there is room for improvement.

  Accordingly, an object of the present invention is to provide a motorcycle body cover structure in which an air passage can be easily provided in a vehicle body cover by a simple and small molding die, and to easily provide an under cover and a step floor on the vehicle body frame. It is an object of the present invention to provide a body cover structure for a motorcycle that can be attached to a motorcycle.

A motorcycle body cover structure according to claim 1 includes a front cover that covers a front portion of a head pipe, an under cover that covers a lower portion of a vehicle body frame, and a step floor for a driver's footrest. In a scooter type motorcycle, a flange portion extending toward the center in the vehicle width direction is provided on the side portion of the under cover, the lower portion of the flange portion is overlaid on the body frame, and the step floor is overlaid on the upper portion of the flange portion. The flange part and the step floor are attached to the body frame. The flange part of the under cover is provided with a relatively large-diameter through hole that penetrates up and down, and protrudes downward on the step floor and has a smaller diameter than the through hole. A mounting boss portion is provided, and the flange portion is sandwiched between the step floor and the vehicle body frame .
A flange portion extending toward the vehicle width direction center of the side of the under cover is provided, and the lower portion of the flange portion is overlaid on the body frame and the step floor is overlaid on the upper portion of the flange portion. By attaching to the frame, the number of parts is reduced.

The flange of the A Ndakaba, by providing a relatively large diameter through hole vertically penetrating, it is possible to improve the mounting of the under cover.

The scan Teppufuroa, by providing a substantially smaller diameter of the mounting boss portion through the through hole in the step floor causes protruding downward, it is possible to improve the mounting of the step floor.

The invention according to claim 2 is characterized in that the boss portion is attached to the vehicle body frame side with a bolt while being recessed below the upper surface of the through hole.
The step floor can be mounted low while securing the rigidity of the step floor by securing the boss portion with a bolt to the vehicle body frame side while being recessed below the upper surface of the through hole.

  In the invention according to claim 1, the flange portion extending toward the vehicle width direction center is provided on the side portion of the under cover, the lower portion of the flange portion is overlaid on the body frame, and the step floor is overlaid on the upper portion of the flange portion, Since the under cover is attached to the body frame together with the step floor, the number of parts can be reduced. As a result, there is an advantage that the cost can be reduced.

Further , since the flange portion of the under cover is provided with a relatively large-diameter through-hole penetrating vertically, there is an advantage that it is possible to improve the attachment property of the under cover.

Furthermore , since the step floor is projected downward and the step floor is provided with the mounting boss portion having a diameter substantially smaller than that of the through hole, there is an advantage that the mounting property of the step floor can be improved.

In the invention according to claim 2 , the boss portion is attached to the vehicle body frame side with the bolt while being recessed below the upper surface of the through hole, so that the step floor is attached low while ensuring the rigidity of the step floor. There is an advantage that you can.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
“Front”, “Rear”, “Left”, “Right”, “Up”, “Down” follow the direction seen from the operator, Fr is front, Rr is rear, L is left, R is right , CL indicates the center of the vehicle body (vehicle width center). The drawings are viewed in the direction of the reference numerals.

FIG. 1 is a left side view of a motorcycle according to the present invention.
The motorcycle 10 includes a body frame 11, a front fork 13 attached to a head pipe 12 of the body frame 11, a front wheel 14 and a front fender 15 attached to the front fork 13, a handle 16 connected to the front fork 13, a handle 16, a handle cover 17 covering the periphery of the vehicle body 16, an auxiliary equipment storage box 18 attached to a central lower portion (low floor portion) of the vehicle body frame 11, and a swing type power unit 21 attached to the rear upper part of the vehicle body frame 11 (the front engine 22 And rear transmission mechanism 23), a rear wheel 24 attached to the rear part of the power unit 21, a rear suspension 25 for suspending the power unit 21 on the rear upper part of the vehicle body frame 11, and a rear upper part attached to the rear part of the vehicle body frame 11. The storage box 26 and the upper part of the storage box 26 are opened. The scooter type vehicle mainly includes a seat 27 that can be attached, a fuel tank 28 that is attached to the rear upper part of the body frame 11 behind the storage box 26, and a vehicle body cover 30 that covers the vehicle body such as the body frame 11. .

The vehicle body cover 30 includes a front cover 31 that covers the front portion of the head pipe 12, a leg shield 32 that covers the driver's legs, a step floor 33 for the driver's footrest, and a lower portion of the step floor 33. And an under cover 34 that covers the lower part of the body frame 11 and a rear cover 35 that covers the rear half of the body frame 11.
In the figure, 16a is a grip, 41 is a front suspension, 42 is a headlamp, 43 is a main stand, 44 is a kick arm for starting the engine, 45 is a tail lamp, 46 is a rear fender, 47 is a rear grip, 48 is an air cleaner, 49 Is a carburetor.

  FIG. 2 is a plan view of the motorcycle according to the present invention, and shows that the motorcycle 10 includes a meter 51, left and right mirrors 52 and 52, a radiator 53, and a muffler 54. The radiator 53 is integrally provided on the right side of the power unit 21.

FIG. 3 is an exploded perspective view of the vehicle body frame according to the present invention.
The vehicle body frame 11 is a divided frame that is divided into a front frame 11F, a rear frame 11R, and a subframe 81 in the front and rear portions below the step floor 33 (see FIG. 1).
The front frame 11F includes a head pipe 12, a head pipe post 61 extending downward from the head pipe 12, a pair of left and right main frames 62, 62 extending from the lower end of the head pipe post 61 to the rear, and left and right main frames. 62, 62, and a rear cross member 63 spanned between the rear ends, and is an integrally cast frame of a substantially rectangular frame in plan view, for example, a cast product of aluminum alloy. Since it is a B-shaped frame in plan view, it has a space S1 in the center.

  As described above, the left and right main frames 62 and 62 are members extending rearward from the head pipe 12, and an inclined surface inclined rearward and upward is formed at a lower portion of the rear end thereof. 64. The rear cross member 63 is an open U-shaped member when viewed from the front, and the height of the center portion of the vehicle width is set lower than the main frames 62 and 62.

  The rear frame 11R includes a pair of left and right main frames 71, 71, a front cross member 72 spanned between intermediate portions in the front-rear direction of the left and right main frames 71, 71, and rear ends of the left and right main frames 71, 71. This is an integrally cast frame, for example, an aluminum alloy cast product, which is composed of a rear cross member 73 suspended between them. The left and right main frames 71, 71 are formed with inclined surfaces that are inclined rearward and downward at the lower part of the front end, and the inclined surfaces serve as rear coupling surfaces 74, 74. These main frames 71 and 71 are members having a substantially inverted Z shape in a side view, extending further rearward, extending upward from the rear end thereof, and further extending rearward and upward from the upper end thereof.

The vehicle body frame 11 is formed by superimposing the rear coupling surfaces 74, 74 on the front coupling surfaces 64, 64 and coupling with bolts and nuts 75 (... indicates a plurality, the same applies hereinafter). The rear frame 11R is integrally coupled to the front frame 11F.
The rear frame 11R is obtained by connecting a subframe 81 to a rear end portion with bolts, nuts 85. The sub-frame 81 includes left and right storage box posts 82 and 82, and a connection stay 83 that connects the storage box posts 82 and 82. The coupling portion of the subframe 81, that is, the portion coupled by the bolts, nuts 85,... Is provided before and after the rear suspension mounting portion 77, and serves also as a reinforcement. Reference numeral 78 denotes a hanger pivot portion.

FIG. 4 is a left side cross-sectional view of the vehicle body frame, power unit, auxiliary equipment storage box, step floor and undercover according to the present invention.
The step floor 33 overlaps the front end of the flat footrest portion 33a with the lower edge portion 32a of the leg shield 32, and extends the rear end portion of the footrest portion 33a upward to form the rear wall portion 33b. The rear wall portion 33b covers the front portion of the engine 22.
The rear frame 11R is configured by attaching the power unit 21 to a hanger pivot portion 78 via a hanger plate 91 so as to be able to swing up and down.

  The engine 22 of the power unit 21 is a four-cycle single-cylinder water-cooled engine, in which the cylinder is arranged almost horizontally with the vehicle body forward. Specifically, the engine 22 is disposed behind the step floor 33 with the head cover 92 facing forward, the head cover 92 is provided with an ignition coil 93, and the cylinder head 94 is provided with an ignition plug 95 (in front of the engine 22). These ignition coil 93 and ignition plug 95 are connected by a high voltage cord 96.

  The auxiliary machine storage box 18 is a box having a substantially rectangular shape when viewed from above, and is disposed in the space S1 of the front frame 11F. The front upper flange 18a is placed on the lower end of the head pipe post 61, In addition to mounting with the nut 101, the lower bracket 18 b is mounted on the rear cross member 63 and mounted with bolts and nuts 102. Since the auxiliary machine storage box 18 is arranged below the step floor 33, the auxiliary machine storage box 18 can be easily arranged using the empty space below the step floor 33 effectively.

  In this figure, (1) the battery 103 housed in the accessory storage box 18 is attached with the band 104, and (2) the lower part of the front frame 11F and the accessory storage box 18 are covered by the resin under cover 34. Indicates that

FIG. 5 is a plan view around the front frame, engine, accessory storage box, step floor, and under cover according to the present invention.
The front frame 11F has a first cross member 66 spanned between the front portions of the left and right main frames 62, 62, and a second cross member 67 spanned between the rear portions of the left and right main frames 62, 62. The first and second cross members 66 and 67 are press-formed products of steel plates.

The step floor 33 is provided with a box inspection port 33c for inspecting the battery 103 inside the auxiliary equipment storage box 18 and mainly a plug inspection port 33d for inspecting the spark plug 95.
The box inspection port 33c is a rectangular opening in plan view that passes almost directly above the battery 103, has an opening width that is substantially the same as the width of the battery 103, and has an opening length that extends almost the entire length of the accessory storage box 18. Yes, it is covered with a lid 105.

  The plug inspection port 33 d is a substantially rectangular opening that is opened at a position where the inspection work of the spark plug 95 is easy in the rear wall portion 33 b of the step floor 33, and is covered with the lid 106.

6 is a sectional view taken along line 6-6 of FIG.
The left and right main frames 62, 62 are substantially U-shaped cross-sectional members in rear view having inner standing walls 62a, 62a near the vehicle body center CL and outer outer standing walls 62b, 62b. Flange 62c, 62c is extended horizontally from the upper end of 62b outward.
The auxiliary machine storage box 18 extends flanges 18c, 18c horizontally from the left and right upper side portions over the entire length, and forms fitting grooves 18d, 18d extending in the front-rear direction on the lower surface of these flanges 18c, 18c, The fitting grooves 18d and 18d are fitted to the upper ends of the inner standing walls 62a and 62a so as to be placed between the left and right main frames 62 and 62.
107 is an accelerator wire cable, and 108 is a rear brake wire cable.

  The step floor 33 has edge portions 33e and 33e extending downward from the left and right ends of the footrest portion 33a, and mounting boss portions 33f and 33f projecting downward from the lower surface of the footrest portion 33a. The under cover 34 extends side plates 34b, 34b from the left and right ends of the bottom plate 34a to the back side of the edges 33e, 33e of the step floor 33.

In this figure, the left and right ends of the first cross member 66 are overlaid on the flanges 62c and 62c of the left and right main frames 62 and 62, and the mounting bosses 33f of the step floor 33 are placed on these left and right ends. 33f is overlapped, and the flanges 62c and 62c, the left and right ends of the first cross member 66, and the mounting bosses 33f and 33f are attached together by bolts 111 and 111 and nuts 112 and 112. The nut 112 is attached to the clip 113, and is positioned by inserting the clip 113 into the flange 62c.
Further, the first cross member 66 has auxiliary stays 68, 68 each having a substantially inverted L shape in rear view fixed to both left and right ends. The side plates 34b of the under cover 34 are fixed to the vertical plates 68a, 68a of the auxiliary stays 68, 68. 34 b is attached with bolts and nuts 114, 114.

7 is a cross-sectional view taken along line 7-7 of FIG.
The under cover 34 is formed with cover flanges (flange portions) 34c, 34c extending horizontally from the upper ends of the side plate portions 34b, 34b toward the vehicle width center CL. The left and right main frames 62, 62 are provided on the flanges 62c, 62c with the left and right ends of the second cross member 67, the mounting bosses 33g, 33g of the step floor 33, and the cover flanges 34c, 34c of the under cover 34, respectively. It is piled and bolted. Details of the bolting structure will be described with reference to FIG.

FIG. 8 is a detailed view of the second cross member mounting portion according to the present invention.
The cover flange 34c is superimposed on the flange 62c of the main frame 62, and has a relatively large diameter through hole 34d penetrating vertically.
The second cross member 67 is formed with a substantially cup-shaped boss portion 67a protruding downward at an end portion. The boss portion 67a includes a substantially dish-shaped lower end portion 67b having a slightly smaller diameter than the through hole 34d, a horizontal step portion 67c continuous to the upper end of the lower end portion 67b, and a cylindrical portion having a larger diameter than the through hole 34d. 67d.
The step floor 33 has a mounting boss 33g protruding downward from the lower surface of the footrest 33a, and the lower end surface of the mounting boss 33g is placed on the bottom surface of the lower end 67b of the second cross member 67. is there.

The structure of the second cross member mounting portion is that the cover flange 34c is overlaid on the flange 62c of the main frame 62, and the boss portion 67a of the second cross member 67 is overlaid thereon, whereby the stepped portion 67c is formed on the cover flange 34c. In addition, the step floor 33 is further stacked thereon, so that the lower end surface of the mounting boss portion 33g is placed on the bottom surface of the lower end portion 67b, and the bolt 115 and the nut 116 are attached together. The nut 116 is attached to the clip 117, and is positioned by inserting the clip 117 into the flange 62c.
The under cover 34 is attached to (1) a structure in which the side plate portions 34b and 34b shown in FIG. 6 are bolted, and (2) a bolt in which the cover flanges 34c and 34c shown in FIGS. 7 to 8 are bolted. Only one of the structures may be used. In the case of only the mounting structure of FIG. 6, the cover flanges 34c and 34c of FIG. 7 are unnecessary.

  Further, in this figure, a boss portion 33o that protrudes downward is formed at a position facing the second cross member 67 in the footrest portion 33a, and the boss portion 33o is placed on the second cross member 67 and screw 118 from below. It shows that it was fixed with. Thus, the second cross member 67 can also support the footrest portion 33a on the step floor 33. Similarly, the first cross member 66 shown in FIG. 6 can be supported by the first cross member 66 by screwing the foot mounting portion 33a from below. Therefore, it can be said that the first and second cross members 66 and 67 are support members (reinforcing members) that support the step floor 33.

FIGS. 9A to 9C are configuration diagrams of the rear lower structure of the undercover according to the present invention.
FIG. 4A is a partial plan view of a bottom plate portion 34a in the under cover 34. FIG.
The under cover 34 is obtained by surrounding a bottom plate portion 34a with a thin portion 34e extending in the vehicle width direction, a substantially U-shaped cut 34f continuous with the base end of the thin portion 34e, a thin portion 34e and the cut 34f. A flat tongue-shaped piece 34g in plan view, a hole 34h in plan-view rectangular shape opened on the tip side of the tongue-shaped piece 34g, a flange 34i provided at the edge of the hole 4h, and a back surface of the flange 34i. The provided ribs 34j and 34j are integrally formed.

  (B) is a cross-sectional view taken along the line bb of (a), in which the flange 34i is a downward-facing hook that extends upward from the tongue-shaped piece 34g, and this hook faces the hole 34h. Show.

  (C) is a sectional view taken along line cc of (a), in which a thin-walled portion 34e that is thinner than other portions and formed in a groove shape is formed on a part of the outer surface of the bottom plate portion 34a, and the thin-walled portion 34e. It is shown that the tongue-like piece 34g is connected to the base plate and the tongue-like piece 34g is formed on a substantially flat plate. Since it is the resin under cover 34, the thin portion 34e is made thinner than the other portions, so that the thin portion 34e functions as a hinge that is elastically deformed when the tongue-shaped piece 34g is bent in or out. Fulfill.

FIG. 10 is a cross-sectional view of the rear lower structure of the undercover according to the present invention, wherein the thin-walled portion 34e is an elastically deformable hinge, the tongue-like piece 34g is bent into the undercover 34, and the bending angle is This shows that the collar 34i provided at the tip of the tongue-shaped piece 34g is hung on the rear cross member 63 on the vehicle body side.
Thus, the tongue-like piece 34g can be supported on the vehicle body side by simply hooking and hooking the collar portion 34i on the vehicle body frame 11, and it is not necessary to stop this portion with bolts, screws, rivets or the like. In addition, even when the positions of the under cover 34 and the rear cross member 63 on the vehicle body side are relatively displaced, the misalignment is absorbed by the bending angle of the tongue-shaped piece 34g and the flange 34i, which is favorable. The latched state can be maintained. Therefore, it is possible to satisfactorily assemble a cover that is difficult to produce, such as the resin under cover 34. Furthermore, even when the under cover 34 is deformed, a good latching state can be maintained similarly.

By hanging the tongue-like piece 34g on the vehicle body side at a predetermined bending angle, a relatively large air passage k through which air enters and exits can be formed in the notch 34f and the portion surrounded by the notch 34f.
The flat tongue-shaped piece 34g is used as a wind guide plate for guiding cooling air, and the air passage 34k opened in the bottom plate portion 34a is used as a cooling air introduction opening, and engine cooling air is supplied from the outside through the cooling air introduction opening. By introducing, the engine 22 (see FIG. 4) can be cooled. The rear lower structure of the under cover 34 and the cooling air introduction structure are also shown in FIG.

11 (a) and 11 (b) are explanatory views showing the undercover molding method according to the present invention.
(A) shows that the under mold 34 is formed by matching the upper mold 121 and the lower mold 122.
(B) shows that the upper mold 121 and the lower mold 122 are released in the vertical direction and the molded under cover 34 is taken out.

  In the under cover 34, a thin-walled portion 34e recessed in the plate thickness direction, an incision 34f vertically penetrating, a tongue-shaped piece 34g obtained by surrounding the thin-walled portion 34e and the notch 34f, a hole 34h penetrating vertically, a hook with a downward hook shape Since the portion 34i is formed, the under cover 34 can be molded using the upper and lower molds 121 and 122 as the mold for molding. Therefore, a simple molding die can be used, and the shape and position of the air passage are not limited.

12 (a) to 12 (c) are modification diagrams of the rear lower structure of the undercover according to the present invention.
(A) shows that a substantially U-shaped cut 34f was formed in order to obtain a tongue-like piece 34g having a semi-elliptical shape in plan view.
(B) shows that a substantially U-shaped cut 34f was formed in order to obtain a trapezoidal tongue piece 34g in plan view.
(C) shows that a perforated slit 34m is formed in the under cover 34 instead of the thin portion 34e. The perforated slit 34m serves as a hinge that can be elastically deformed when the tongue-like piece 34g is bent in or out of the under cover 34.

In the embodiment of the present invention, (1) the motorcycle 10 is not limited to a scooter type vehicle.
(2) The tongue-shaped piece 34g and the air passage 34k may be provided in the vehicle body cover 30, and are not limited to those provided in the under cover 34.
(3) The thin portion 34e may be formed on at least the inner surface or the outer surface of the vehicle body cover 30.
(4) The air passage 34k may be any as long as air enters and exits. In addition to taking outside air into the vehicle body cover 30, the air inside the vehicle body cover 30 may be discharged outward.
(5) The tongue-shaped piece 34g may be any shape as long as it functions as a wind guide plate that guides cooling air by bending it into or out of the vehicle body cover 30. For example, the direction of the tongue-like piece 34g is set in accordance with the direction in which air enters and exits from the air passage 34k.

  The motorcycle body cover structure according to the present invention is suitable for use in a relatively small scooter type vehicle.

1 is a left side view of a motorcycle according to the present invention. 1 is a plan view of a motorcycle according to the present invention. It is a disassembled perspective view of the vehicle body frame which concerns on this invention. FIG. 3 is a left side cross-sectional view of the vehicle body frame, power unit, auxiliary equipment storage box, step floor, and undercover surroundings according to the present invention. It is a top view around the front frame, engine, auxiliary equipment storage box, step floor, and under cover concerning the present invention. FIG. 6 is a sectional view taken along line 6-6 of FIG. FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. 4. It is detail drawing of the 2nd cross member attachment part which concerns on this invention. It is a block diagram of the rear part lower part structure of the undercover which concerns on this invention. It is sectional drawing of the rear part lower part structure of the undercover concerning this invention. It is explanatory drawing which shows the molding method of the undercover concerning this invention. It is a modification figure of the rear part lower part structure of the undercover which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Motorcycle (scooter type vehicle), 11 ... Body frame, 12 ... Head pipe, 31 ... Front cover, 33 ... Step floor, 33g ... Mounting boss part, 34 ... Under cover, 34c ... Cover flange (flange part), 34d ... through hole, 115 ... bolt.

Claims (2)

In a scooter type motorcycle having a front cover that covers the front part of the head pipe, an under cover that covers the lower part of the body frame, and a step floor for a driver's footrest,
A flange portion extending toward the center in the vehicle width direction is provided on a side portion of the under cover, a lower portion of the flange portion is overlaid on the vehicle body frame, and the step floor is overlaid on the upper portion of the flange portion. A step floor is attached to the body frame ,
The flange portion of the under cover includes a relatively large-diameter through-hole penetrating vertically.
The step floor protrudes downward and includes a mounting boss portion having a substantially smaller diameter than the through hole,
A body cover structure for a motorcycle , wherein the flange portion is sandwiched between the step floor and the body frame .   2. The vehicle body cover structure for a motorcycle according to claim 1, wherein the boss portion is attached to the vehicle body frame side with a bolt while being submerged below the upper surface of the through hole.

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