JP3815753B2 - Rear cushion mounting structure for motorcycles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rear cushion mounting structure for a motorcycle, and more particularly, to a mounting structure for a single rear cushion installed at a substantially center in the width direction of a vehicle body across a vehicle body frame and a rear arm of the motorcycle.
[0002]
[Prior art]
In a motorcycle, a rear cushion composed of a coil spring and an oil damper that extend in the vertical direction is interposed between a rear arm that is swingably attached to the body frame and a frame member at the top of the body. As for the rear cushion of such a motorcycle, there are many so-called single suspensions in which only one rear cushion is installed at the approximate center in the width direction of the vehicle body, in addition to the rear cushions installed on both sides of the rear wheel. It is used in the following car models.
[0003]
[Problems to be solved by the invention]
By the way, in a motorcycle in which a single rear cushion as described above is installed at the approximate center in the width direction of the vehicle body, a cross is made against a pair of left and right pipe frame members arranged at the top of the vehicle body frame like a seat rail. The tube is bridged and welded, and a reinforcing gusset is welded across the frame member and the cross tube, and the upper end of the rear cushion is attached to the cross tube. There are problems in terms of the number of parts and production cost because the end face processing is troublesome and the number of mating parts of the gusset increases.
[0004]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a single rear cushion at the substantially center in the width direction of the vehicle body across the upper portion of the vehicle body frame and the rear arm as described in claim 1. In the installed motorcycle, on the left and right sides of the upper part of the vehicle body frame, a pair of left and right seat rails and back stays are connected to a portion extending obliquely forward from the connecting portion of the seat rail, and the back stay. A gusset of a hollow structure made of sheet metal is erected by welding fixing over a portion extending obliquely rearward and rearward from the connecting portion, and a cross tube is integrally fixed to the left and right gussets by welding. And the upper end of the rear cushion is attached to the center of the cross tube in the vehicle width direction.
[0005]
Further, in the rear cushion mounting structure for a motorcycle described in claim 1, as described in claim 2, two cross tubes are installed in the longitudinal direction of the vehicle body, and cross over the two cross tubes. The bracket for attaching the upper end of the rear cushion is fixed.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a rear cushion mounting structure for a motorcycle according to the present invention will be described below with reference to the drawings.
[0007]
FIG. 1 shows an overall appearance of a motorcycle to which a rear cushion mounting 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.
[0008]
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.
[0009]
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.
[0010]
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.
[0011]
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.
[0012]
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.
[0013]
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.
[0014]
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.
[0015]
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.
[0016]
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.
[0017]
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.
[0018]
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.
[0019]
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.
[0020]
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.
[0021]
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.
[0022]
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. Long holes 45g for fixing the rear wheel axles in an adjustable manner are formed at the rear ends of the left and right rear arm bodies 45b, which are integrally fixed by welding.
[0023]
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.
[0024]
In the motorcycle 1 in which the front wheel 4 and the rear wheel 7 are respectively installed with respect to the vehicle body frame 10 as described above, the fuel tank 6 is connected to the main pipe 12 and the seat rail 13 as shown in FIGS. The tandem seat 8 is installed so as to be positioned by the tank locking bracket 22 and the tank fixing bracket 23 so as to extend over the hollow gusset 24 at the rear of the fuel tank 6. It is installed so as to be positioned by the bracket 27.
[0025]
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.
[0026]
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.
[0027]
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.
[0028]
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.
[0029]
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.
[0030]
Further, the motorcycle 1 in which the respective components are installed as described above is provided with a meter cover 72 with a fuel meter 73 attached to the fuel tank 6 on the upper surface thereof, and behind the steering head pipe 11. A frame cover 74 that covers the front side of the fuel tank 5 and a frame cover 75 that covers both lower sides of the fuel tank 5 are provided.
[0031]
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 passenger footrest 66 and the like are provided on both sides of the vehicle body. On the rear side thereof, a sprocket (not shown) of the engine output shaft and a sprocket 63 of the rear wheel 7 are provided. A chain case 79 is provided on the left side of the vehicle body with respect to the rear arm 45 to cover the upper half of the chain 64 that has been stretched.
[0032]
By the way, in the motorcycle 1 of the present embodiment having the above-described configuration, as described above, the seat rail 18 and the backstay 17 are connected to the connecting portions of the seat rail 18 and the backstay 17 on both the left and right sides of the upper portion of the body frame 10. The hollow gussets 24 are integrally attached by welding, and the front and rear two cross tubes 25 are integrally fixed to the left and right hollow gussets 24 by welding, and the two cross tubes 25, a rear cushion upper end mounting bracket 26 is provided.
[0033]
In such an embodiment, the gusset 24 for welding each cross tube 25 has a sheet metal hollow structure widely welded in the front-rear direction across the seat rail 18 and the backstay 17, and FIG. As shown, each cross tube 25 is integrally fixed to a seat 24a formed by partially inflating the inner surface side of the gusset 24 by welding.
[0034]
Therefore, the stress transmitted from the rear cushion 50 is widely dispersed in the front-rear direction by the gusset 24 and transmitted to the vehicle body frame (the seat rail 18 and the backstay 17), and the complicated joints of the gusset are reduced. The number of points can be reduced, and since the gusset 24 is a sheet metal, a flat seat 24a can be easily formed to simplify the end face processing of the cross tube 25, and the end of the cross tube 25 can be The appearance of the fixed gusset 25 is also improved.
[0035]
In the present embodiment, two cross tubes 25 are installed in the longitudinal direction of the vehicle body, and the upper end of the rear cushion 50 is attached to the center of the cross tube 25 in the vehicle width direction across the two cross tubes 25, 25. Since the bracket 26 is fixed, the stress applied to the upper end mounting bracket 26 is distributed to the two cross tubes 25, 25, and the durability of the cross tube 25 itself is improved. Since stress is dispersed and transmitted by the cross tubes 25, 25, the durability of the fixing portion between the gusset 24 and the cross tube 25 is also improved.
[0036]
In the motorcycle 1 of the present embodiment, as described above, the rear arm 45 connects both ends of the U-shaped pipe 45c to the left and right rear arm main bodies 45b, and the U-shaped pipe 45c and each rear arm main body 45b. The connection pipe 45e and the reinforcement pipe 45f are connected to each other to form a substantially triangular shape with the rear arm main body 45b as the bottom when viewed from the side, so that the structure is sufficiently reinforced. ing.
[0037]
A rear cushion lower end mounting bracket 46 is provided on the cross member 45d connected to the left and right rear arm bodies 45b with respect to the rear arm 45 thus reinforced, and the rear cushion 50 is disposed between the left and right reinforcing pipes 45f. Therefore, the rear cushion 50 can be mounted at an angle close to the vertical without using a link mechanism, thereby making the vicinity of the lower end portion of the rear cushion 50 compact, and the space of the part. Can be used effectively, and the degree of freedom in design layout can be improved.
[0038]
【The invention's effect】
According to the motorcycle rear cushion mounting structure of the present invention as described above, the stress transmitted from the rear cushion to the vehicle body frame can be widely dispersed in the front-rear direction, and the complicated joints of the gusset are reduced. Thus, the number of parts can be reduced, the end surface treatment of the cross tube can be simplified, and the appearance of the part can be improved.
Further, according to the configuration described in claim 2, the stress applied to the upper mounting bracket of the rear cushion can be distributed to the two cross tubes to improve the durability of the cross tube itself, and the cross The stress transmitted from the tube to the gusset can be dispersed, and the durability of the fixing portion between the gusset and the cross tube can be improved.
[Brief description of the drawings]
FIG. 1 is a side view showing the appearance of a motorcycle to which a rear cushion mounting 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 an embodiment of the rear cushion mounting structure of the present invention.
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;
10 is an explanatory front view of the rear cushion mounting structure shown in FIG. 8. FIG.
11 is a cross-sectional view showing a connecting portion between a seat rail and a cross tube via a gusset in the rear cushion mounting structure shown in FIG. 8;
[Explanation of symbols]
1 motorcycle 10 body frame 17 back stay 18 seat rail 24 hollow gusset (gusset)
25 Cross tube 26 Rear cushion upper end mounting bracket 45 Rear arm 50 Rear cushion

Claims (2)

In a motorcycle in which one rear cushion is installed at the center of the vehicle body in the width direction across the upper part of the body frame and the rear arm, a pair of left and right seat rails are provided on the left and right sides of the upper part of the body frame. A gusset of a hollow structure made of sheet metal is welded and fixed to a connecting portion of the back stay across a portion extending obliquely forward from the connecting portion of the seat rail and a portion extending obliquely rearward from the connecting portion of the back stay. The cross tube is integrally fixed by welding over the right and left gussets, and the upper end of the rear cushion is attached to the center of the cross tube in the vehicle width direction. The rear cushion mounting structure for motorcycles. The motorcycle according to claim 1, wherein two cross tubes are installed in the longitudinal direction of the vehicle body, and a bracket for attaching an upper end of the rear cushion is fixed to the two cross tubes. Rear cushion mounting structure.

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