JP3755618B2 - Motorcycle frame cover structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure of a frame cover provided so as to cover between a steering head pipe and a fuel tank in a motorcycle.
[0002]
[Prior art]
In a motorcycle, normally, a hollow saddle type fuel tank, that is, a sealed space between a bottom member extending in the front-rear direction so that the cross-sectional shape in the width direction is an inverted U shape, and the bottom member A fuel tank is formed by joining the flanges of the respective peripheral portions by welding or the like so as to integrally form the surface member that covers the bottom member from the outside so as to form the bottom of the steering head pipe. In the so-called American type motorcycle, the fuel tank is arranged so as to straddle the main pipe (main frame), and the engine is disposed below the fuel tank. The front side of the steering head pipe and fuel tank is exposed without the front part being covered with a cowling that covers the front of the vehicle body from the front side of the steering head pipe. It has become a state.
[0003]
[Problems to be solved by the invention]
By the way, with respect to the hollow saddle type fuel tank used in the motorcycle as described above, when the tank is manufactured with a metal having a low elongation, the surface member and the bottom member are deeply squeezed and press-molded. Since the flange line, which is the joint between the flanges of the peripheral edges of the surface member and the bottom member, has spread considerably outward, the lower part on the front side of the fuel tank has been greatly opened. turn into.
[0004]
Therefore, if an American type motorcycle with the front of the fuel tank exposed is installed with a fuel tank with such a flange line extending outward, the inside (bottom) of the fuel tank becomes visible from the front. In addition, the appearance of the fuel tank is poor, and the lower part of the front side of the fuel tank is widely open, so that the traveling wind that hits the front side of the fuel tank from the exposed front side is curved on the inner side of the lower part of the fuel tank. The air flows to the rear of the vehicle body through the space surrounded by the bottom member, and does not flow toward the engine disposed below it, resulting in poor air cooling efficiency of the engine. For this reason, it is necessary to additionally provide parts such as an air scoop.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention integrally couples the outer surface member and the inner bottom member by joining the flanges of the respective peripheral edges as described in claim 1. The hollow saddle type fuel tank is disposed behind the steering head pipe with its front exposed, and the engine body is disposed below the fuel tank so that the bottom member of the fuel tank can be seen from the front. For the motorcycle with the lower part on the front side of the tank open , a frame cover is provided so as to cover between the steering head pipe and the fuel tank , and the frame cover is viewed from the front of the vehicle body. in the front side of the fuel tank flange line joining the flanges with each other on the surface member and the bottom member has a substantially inverted U-shape, surrounds the lower inner curved bottom member of the tank So as to cover the space from the front to be, substantially covering the inside of the flange line from the front, and, formed as the lower surface followed downward from the front of the frame cover is smoothly curved toward the upper portion of the engine body In addition, a pair of left and right lower covers extending on both lower sides of the fuel tank are connected to lower portions of the left and right sides of the frame cover, respectively, and the lower surface of the lower cover is connected to the lower surface of the frame cover. In a state of being smoothly and continuously, it is formed so as to face the upper part of the engine body.
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a frame cover structure for a motorcycle according to the present invention will be described below with reference to the drawings.
[0008]
FIG. 1 shows the overall appearance of a motorcycle to which the frame cover structure of the present invention is applied as viewed from the side. The motorcycle 1 includes a steering wheel equipped with a headlight 2 and a speedometer 3. A steering handle 5 for operating the front wheel 4 is extended greatly upward without being covered with a cowling at the upper front, and behind a water droplet type fuel tank 6 installed so as to straddle the vehicle body frame, This is a so-called American type motorcycle in which a stepped tandem seat 8 extending to the upper side of the rear wheel 7 is installed, and the engine body 9 is installed below the fuel tank 6 without being covered with a cowling.
[0009]
2 and 3 show a body frame of such a motorcycle 1, and the body frame 10 is a semi-cradle type frame, in which the constituent members of the frame are joined together by welding. is there.
[0010]
That is, at the front portion of the vehicle body frame 10, the front end portion of one main pipe 12 that extends rearward and bends downward in the middle with respect to the head pipe 11 that pivots the steering, and extends downward. The front end of one large-diameter down tube 13a is reinforced by a frame connecting gusset 14, and the tension pipe 15 is connected across the main pipe 12 and the down tube 13a. Has been.
[0011]
The lower end of one large diameter down tube 13a is connected to a small diameter down tube 13b that extends rearward and separated to the left and right. The lower end of the main pipe 12 and the rear end of each down tube 13b are shown in FIG. As described above, both are connected to a frame connecting cross pipe 16 extending in the width direction of the vehicle body, and left and right back stays 17 extending obliquely rearward are connected to both ends of the cross pipe 16 respectively. ing.
[0012]
In front of the middle bent portion of the main pipe 12, seat rails 18 that are divided into left and right and extend rearward are respectively connected, and the rear ends of the seat rails 18 are respectively connected in the middle of the backstays 17. Each of the left and right backstays 17 is connected with a tube 19 welded with a mounting bracket 21 for a passenger's footrest in the middle thereof.
[0013]
The vehicle body frame 10 in which the structural members of the frame are integrally connected as described above is provided with a tank locking bracket 22 for locking the front portion of the fuel tank at the upper part of the main pipe 12. A tank fixing bracket 23 for fixing the rear end of the fuel tank and locking the front end of the seat is provided on the left and right seat rails 18 at the front portion of the seat rail 18.
[0014]
In addition, a hollow gusset 24 made of a sheet metal hollow structure is integrally attached to the connecting portion between the left and right seat rails 18 and the back stay 17 by welding. 24, two front and rear cross tubes 25 are integrally fixed by welding, and a mounting bracket 26 for mounting the upper end of the rear cushion is provided across the two cross tubes 25.
[0015]
In addition, a rear bracket 27 for supporting the rear fender from above and for fixing the rear portion of the seat is provided over the rear end portions of the left and right back stays 17 at the rear of the hollow gusset 24. ing.
[0016]
Further, a hollow tubular pivot boss 28 for attaching a rear arm is provided in the vicinity of the lower end of the main pipe 12 above the frame connecting cross pipe 16 in a state where the main pipe 12 is skewered in the width direction of the vehicle body. An engine mounting bracket 29 is welded across the pivot boss 28 and the main pipe 12 below the pivot boss 28 so as to reinforce the mounting of the pivot boss 28.
[0017]
In addition to the brackets described above, the vehicle body frame 10 includes a rear arm pivot shaft fixing bracket 31, a regulator mounting bracket 32, an engine mounting bracket 33, a side stand mounting bracket 34, and a side cover mounting bracket. Various parts mounting brackets, such as 35 and 36, an air cleaner mounting bracket 37, and a main stand mounting bracket 38, are integrally fixed to an appropriate position of the vehicle body frame 10 by welding.
[0018]
As shown in FIG. 1, a steering portion having a steering handle 5 on the upper side and a front fork 41 on the lower side is fixed to the upper end of the main pipe with respect to the vehicle body frame 10 formed as described above. The front head 4 is pivotally supported at the lower end of a front fork 41 having a cushion portion.
[0019]
On the one side of the front wheel 4 is disposed a disc brake 42 comprising a caliper 42a attached to the front fork 41 side and a disc 42b attached to the wheel side of the front wheel. A front fender 43 is attached to the front fork 41 so as to cover the upper part of the front wheel 4 from above.
[0020]
On the other hand, as shown in FIG. 5, a pivot shaft 30 longer than that is inserted into the pivot boss 28 fixed in a skewered state in the width direction of the vehicle body in the vicinity of the lower end of the main pipe 12. Thus, outside the both ends of the pivot boss 28, the left and right front end portions 45a of the rear arm 45 have bushes coated with grease between the shaft 30 and the front end portion 45a, respectively, and an oil seal on the inner end side thereof (not shown). ) Are supported so as to be freely rotatable.
[0021]
Both end portions of the pivot shaft 30 projecting outward from the rear arm front end portion 45a are supported by pivot shaft support brackets 31 fixed to the left and right back stays 17, and the pivot shaft 30 (bolt) is the bracket. The outer end side of each rear arm front end 45a that is fixed to the pivot 31 with a nut and is fitted to the pivot shaft 30 is a cover-like seal member 31a provided inside each pivot shaft support bracket 31. Each is oil sealed.
[0022]
The rear arm 45 is formed by integrally connecting a plurality of constituent members by welding. As shown in FIGS. 6 and 7, the rear arm 45 is connected to the left and right rear arm main bodies 45 b having front end portions 45 a fitted into the pivot shaft 30. Thus, both ends of the U-shaped pipe 45c are connected to the rear end of the U-shaped pipe 45c, and a cross member 45d is connected to the middle of the U-shaped pipe 45c and the cross member 45d. The left and right connecting pipes 45e are connected to each other, and the reinforcing pipes 45f are connected to the left and right connecting pipes 45e and the rear arm main body 45b.
[0023]
In addition, a mounting bracket 46 for mounting the lower end of the rear cushion is integrally fixed to the rear arm 45 by welding to the cross member 45d, and the mounting bracket 47 for mounting the chain cover is at an appropriate position. As shown in FIG. 1, they are integrally fixed by welding, and are provided with elongated holes 45g at the rear end portions of the left and right rear arm bodies 45b for fixing the axles of the rear wheels in an adjustable manner. As described above, the rear wheel 7 is pivotally mounted on the rear end portion of the rear arm 45.
[0024]
Corresponding to the rear cushion lower end mounting bracket 46 of the rear arm 45, as already shown in FIGS. 2 and 3, two front and rear cross tubes 25 are integrally welded to the left and right hollow gussets 24, respectively. A rear cushion upper end mounting bracket 26 is provided so as to extend over the two cross tubes 25, and thereby a rear part interposed between the vehicle body frame 10 and the rear arm 45 as shown in FIG. 8. The cushion 50 is attached across the upper end mounting bracket 26 on the vehicle body frame side (cross tube 25) and the lower end mounting bracket 46 on the rear arm 45 side.
[0025]
In the motorcycle 1 in which the front wheels 4 and the rear wheels 7 are respectively installed with respect to the vehicle body frame 10 as described above, the fuel tank 6 straddles the main pipe 12 and the seat rail 18 as shown in FIG. The fuel tank 6 is positioned by a tank locking bracket 22 and a tank fixing bracket 23 as shown in FIGS. The positioning, as shown in FIG. 1, the tandem seat 8, is installed behind the fuel tank 6, the tank fixing bracket 23 and rear bracket 27 above the hollow gusset 24 as shown in FIGS. 2 and 3 Has been .
[0026]
A rear fender 51 that covers the upper part of the rear wheel 7 from above is fixed by a back stay 17 and a rear bracket 27. Outside the rear fender 51, rear stays 52 are provided on the left and right sides of the vehicle body, respectively. The backrest mounting stay 53 for mounting the backrest 54 of the tandem seat 8 is erected at the rear part of the left and right rear stays 52 so as to connect the two. ing.
[0027]
A blinker 55 is installed on the left and right of the rear portion of the rear stay 52. A tail light 56 is installed on the rear upper surface of the rear fender 51, and a license for attaching a license plate on the lower surface of the rear portion. A bracket 57 and a license lamp 58 for irradiating the license plate are respectively installed.
[0028]
Below the fuel tank 6 between the front wheels 4 and the rear wheels 7, in the space surrounded by the main pipe 12, the down tubes 13a and 13b, and the back stay 17, the engine body 9, the carburetor 60, and an air cleaner (not shown). From the front side of the engine body 9, the exhaust pipe 61 is once extended downward as shown in FIG. 1, and then passes through the right side of the vehicle body as shown in FIG. The rear end is connected to a muffler 62 located on the right side of the rear wheel 7.
[0029]
On the other hand, on the left side of the vehicle body on which the muffler 62 is not disposed, as shown in FIG. 1, an output shaft sprocket (not shown) projecting sideways from the transmission portion continuing to the lower rear of the engine body 9, and the rear A chain 64 for transmitting the rotational driving force of the engine body 9 to the rear wheel 7 is hung over the sprocket 63 fixed to the hub of the wheel 7.
[0030]
As shown in FIG. 9, a driver's footrest 65 is installed on each side of the vehicle body at the lower part of the vehicle body between the front wheel 4 and the rear wheel 7, and a change pedal 68 and a side stand 67 are provided on the left side of the vehicle body. A brake lever 69 and a kick pedal 70 are installed on the right side of the vehicle body, and, as shown in FIG. 1, passenger footrests 66 are installed on both sides of the vehicle body in front of the rear wheel 7, respectively. One center stand 71 is installed behind both sides of the vehicle body 67.
[0031]
Further, the motorcycle 1 in which the respective components are installed as described above is provided with a meter cover 72 that holds the fuel meter 73 with respect to the fuel tank 6 on the upper surface thereof, and at the rear of the steering head pipe 11. A frame cover 74 that covers the front side of the fuel tank 6 and a lower cover 75 that covers both lower sides of the fuel tank 6 are provided.
[0032]
Further, on both sides below the front part of the tandem seat 8, two side covers 76 are provided so as to cover both sides of an air cleaner (not shown), and covers the lower side of the side cover 76. 77, a cover 78 for covering the inside of the passenger footrest 66, etc. are provided on both sides of the vehicle body, and behind them, a sprocket (not shown) of the engine output shaft and a sprocket 63 of the rear wheel 7 are hung. A chain case 79 for covering the upper half of the passed chain 64 is provided on the left side of the vehicle body with respect to the rear arm 45.
[0033]
By the way, in the motorcycle 1 of the present embodiment having the above-described configuration, as described above, the fuel tank 6 is installed behind the head pipe 11 so as to straddle the main pipe 12. An engine body 9 is installed below the tank 6, and a frame cover 74 that covers the front side of the fuel tank 6 from the rear of the head pipe 11, and a lower cover 75 that covers both sides of the fuel tank 6 below. Are provided.
[0034]
That is, in the present embodiment, the fuel tank 6 is formed with a sealed space portion between the bottom member extending along the front-rear direction so that the cross-sectional shape in the width direction is an inverted U shape, and the bottom member. It is commonly used in so-called hollow saddle type motorcycles, in which the bottom member covering the bottom member from the outside is integrally joined by joining the flanges of the respective peripheral portions by welding or the like. However, since the fuel tank is manufactured to have a slightly wide shape with a metal having a low elongation, as shown in FIG. 11, the bottom side of the surface member 6a is greatly opened as viewed from the front of the vehicle body. 6b becomes wide, and the flange line 6c, which is a joint portion between the flanges of the peripheral edge portions of the surface member 6a and the bottom member 6b, extends considerably outward.
[0035]
With respect to such a fuel tank 6, as shown in FIGS. 10 and 11, the main pipe 12 is disposed on the front side of the fuel tank 6 so as to cover the connecting portion of the main pipe 12 and the down tube 13a with respect to the head pipe 11. As seen from the front of the vehicle body, a frame cover 74 that is integrally formed across the left and right sides of the vehicle body so as to straddle the flange line 6c has a flange line 6c that joins the flanges of the surface member 6a and the bottom member 6b. The front side of the fuel tank 6 is provided so as to substantially cover the inside of the flange line 6c from the front, and the lower surface of the frame cover 74 has a traveling wind from the front on the upper part of the engine body 9. It is smoothly curved so that it can be guided toward.
[0036]
Further, in the present embodiment, a pair of left and right lower covers 75 are integrally formed over the left and right sides of the vehicle body in order to smoothly guide the traveling wind toward the upper part of the engine body 9 in cooperation with the lower surface of the frame cover 74. The frame cover 74 formed on the left and right sides of the lower part of the frame cover 74 is connected as a side cover (separate from the side cover 76) at the front of the vehicle body extending to the lower sides of the fuel tank 6. .
[0037]
The frame cover 74 as shown in FIGS. 12 and 13 is configured such that the lower cover mounting bracket 80 is tightened together with bolts by the portions of the mounting holes 74a formed at the lower portions of the left and right sides of the frame cover 74. In this state, it is attached to the body frame.
[0038]
Further, a lower cover (a side cover at the front of the vehicle body) 75 as shown in FIGS. 14 and 15 is arranged so as to cover each mounting hole 74a with respect to the frame cover 74, and the front portion of the cover 75 Are attached to the lower cover mounting bracket 80 which is fastened to both sides of the frame cover 74 by the portions of the mounting holes 75a formed at the upper and lower sides of the frame cover 74, and the locking projections 75b formed on the inner surface of the rear portion. The portion is fixed to a cover fixing portion (not shown) formed on the lower edge portion of the fuel tank 6.
[0039]
According to the frame cover 74 of the present embodiment as described above, in the fuel tank 6 manufactured in a slightly wide shape with a metal having a small elongation, the bottom side of the surface member 6a is wide open, and the bottom member 6b is wide. Even if the flange line 6c is considerably widened, the frame cover 74 can substantially cover the inner portion of the fuel tank 6 with respect to the flange line 6c. The inner side (bottom member 6b) of the inside is not completely visible from the front, and the appearance can be improved.
[0040]
Further, since the inner side of the front side of the fuel tank 6 with respect to the flange line 6c is substantially covered by the frame cover 74, the traveling wind hitting the front side of the fuel tank 6 from the front is blocked by the frame cover 74, and remains as it is. The upper portion of the engine main body 9 that is guided to the lower surface of the frame cover 74 and disposed below the frame cover 74 does not flow through the space inside the lower portion of the fuel tank 6 and to the rear of the vehicle body. Therefore, the efficiency of air cooling of the engine body 9 is improved, and it is unnecessary to separately add parts such as an air scoop for air cooling of the engine body 9.
[0041]
Further, in the present embodiment, a lower cover 75 is integrally connected to the frame cover 74 as a side cover at the front of the vehicle body at both lower portions thereof, and the lower surface of the lower cover 75 is also connected to the frame cover. 74 is curved along the lower surface of 74, so that the traveling wind can be widely received by the lower surfaces of the frame cover 74 and the lower cover 75 and can be smoothly guided to the upper part of the engine body 9. Efficiency can be improved more effectively.
[0042]
In addition, for this reason, although the entire cover including the frame cover 74 and the lower cover 75 is large on both the left and right sides of the vehicle body, it is integrated with the left and right sides of the vehicle body so as to straddle the main pipe 12. Since a pair of left and right lower covers 75 extending toward the lower sides of the fuel tank 6 are connected to the formed frame cover 74 as separate bodies, the entire frame cover is attached to the vehicle body. Each cover 74, 75 can be easily performed.
[0043]
【The invention's effect】
According to the motorcycle frame cover structure of the present invention as described above, the front side of the fuel tank is substantially covered by the frame cover that covers the connecting portion of the vehicle body frame, and the inside of the fuel tank becomes fully visible from the front. It is possible to prevent the deterioration of the appearance due to the fact that the traveling wind that hits the front side of the fuel tank from the front can be guided to the upper part of the engine body, and separately add parts for engine air cooling In addition, the air cooling efficiency of the engine can be improved.
[Brief description of the drawings]
FIG. 1 is a side view showing the appearance of a motorcycle to which a frame cover structure of the present invention is applied.
2 is a side view showing a body frame of the motorcycle shown in FIG. 1. FIG.
3 is a top view of the vehicle body frame shown in FIG. 2. FIG.
4 is a top view showing a connecting portion of a main pipe, a down tube, and a back stay in the vehicle body frame shown in FIG. 2;
5 is a partial cross-sectional top view of a pivot portion of a rear arm in the motorcycle shown in FIG. 1. FIG.
6 is a side view showing a rear arm in the motorcycle shown in FIG. 1. FIG.
7 is a top view of the rear arm shown in FIG. 6. FIG.
FIG. 8 is an explanatory side view showing a rear cushion arrangement relationship and a mounting state in the motorcycle shown in FIG. 1;
FIG. 9 is a top explanatory view showing an arrangement relationship of each part installed in the lower part of the vehicle body such as a muffler, a chain, and a side stand in the motorcycle shown in FIG. 1;
FIG. 10 is a side view showing a frame cover and its vicinity according to an embodiment of the frame cover structure of the present invention.
11 is a front explanatory view showing a state of the frame cover shown in FIG. 10 and its vicinity as seen from the front.
12 is a side view showing the structure of the frame cover itself in the embodiment shown in FIG.
13 is a front view of the frame cover itself shown in FIG. 12. FIG.
14 is a side view showing the structure of the lower cover itself connected to the lower part of the frame cover in the embodiment shown in FIG.
15 is a top view of the lower cover itself shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Motorcycle 6 Fuel tank 6a (Fuel tank) Surface member 6b (Fuel tank) Bottom member 6c (Fuel tank) Flange line 9 Engine body 11 Steering head pipe 74 Frame cover 75 Lower cover (front side of vehicle body) cover)

Claims (1)

A hollow saddle type fuel tank in which the outer surface member and the inner bottom member are integrally coupled by joining the flanges of the respective peripheral portions is disposed behind the steering head pipe with its front exposed. An engine body is disposed below the fuel tank, and a motorcycle having a lower part on the front side of the tank so that a bottom member of the fuel tank can be seen from the front is provided to a steering head pipe and a fuel tank. A frame cover is provided so as to cover the gap , and the frame cover has a substantially inverted U-shaped flange line formed by joining the flanges of the surface member and the bottom member when viewed from the front of the vehicle body. in the front side, so as to cover the space portion surrounded by the lower inner curved bottom member of the tank from the front, substantially covering the inside of the flange line from the front,且, Lower surface continuing downwardly from the front of the frame cover, with is formed so as to smoothly curved toward the upper portion of the engine body, the lower portion of the right and left sides of the frame cover, further, the lower sides of the fuel tank A pair of left and right lower covers extending in the direction are connected to each other, and the lower surface of the lower cover is formed to face the upper portion of the engine body in a state of being smoothly continuous with the lower surface of the frame cover. Motorcycle frame cover structure.

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