JPH062876Y2 - Support structure of exhaust muffler in motorcycle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a support structure for an exhaust muffler in a motorcycle.

(Prior Art and its Problems) As a conventional motorcycle, for example, a center pipe, a seat rail whose front end is fixed to the upper end side of the center pipe, a front end fixed to the lower end side of the center pipe and extending obliquely upward and There is a rear frame 3 whose rear end is fixed to the rear end side of the seat rail to form a triangular shape to form a part of a vehicle body frame, and an exhaust muffler is arranged below the seat rail. .

And, in general, in such a conventional motorcycle, since a strength member is provided between the seat rail and the rear frame in order to increase the rigidity of the frame body,
To prevent the strength member and the exhaust muffler from interfering with each other, (1) As shown in FIG.
The exhaust muffler C is arranged outside the strength member B extending downwardly from the exhaust member, or (2) as shown in FIG. 13, a recess C1 for passing the strength member B is formed in the exhaust muffler C, or Is (3) Exhaust muffler C
The strength member B is curved in order to avoid interference with the strength member B.

However, in the case of (1) above, the exhaust muffler projects too much outward, so that the appearance is poor, and in the case of (2) above, the recess C1 is provided in the exhaust muffler C, There is a problem in that the degree of freedom of the internal and silencing performance is impaired, and in the case of (3) above, the strength member B is curved, so that the strength is impaired.

(Purpose of the Invention) The present invention has been made in view of such a conventional problem, and by using the exhaust muffler as a strength member forming a part of the vehicle body frame, the rigidity of the vehicle body frame and the exhaust muffler are improved. It is an object of the present invention to provide a support structure for an exhaust muffler in a motorcycle that can reduce the weight of the entire vehicle body while maintaining the sound deadening performance of the vehicle.

(Means for Solving Problems) The gist of the present invention for achieving the above object is to provide a center pipe, a seat rail whose front end is fixed to the upper end side of the center pipe, and a front end which is fixed to the lower end side of the center pipe. And a rear frame that extends diagonally upward toward the seat rail, and an exhaust muffler is arranged between the seat rail and the rear frame, and at least two positions on the upper side of the exhaust muffler are located at the front and rear. A support structure for an exhaust muffler in a motorcycle is characterized in that the exhaust muffler is detachably attached to the seat rail, and a lower side of the exhaust muffler is detachably attached to an upper portion of the rear frame.

(Operation) In the exhaust muffler support structure for the motorcycle, the upper side of the exhaust muffler is detachably attached to the seat rail at least at two front and rear positions, and the lower side of the exhaust muffler is detachably attached to the upper portion of the rear frame. The exhaust muffler is a strength member that forms part of the vehicle body frame.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing a main part of the present invention, and FIG. 2 is a schematic view showing a motorcycle to which the present invention is applied.

As shown in FIGS. 1 and 2, a motorcycle 1 includes a center pipe 2 extending obliquely rearward and downward from above, and a seat rail 3 having a front end welded to an upper end side of the center pipe 2.
And a rear frame 4 having a front end welded to the lower end side of the center pipe 2 and extending obliquely rearward and upward toward the seat rail 3, and an exhaust muffler 5 is disposed between the seat rail 3 and the rear frame 4. Has been done. Exhaust pipe 6 at the front end of exhaust muffler 5
The rear end portion 6a is connected.

As shown in FIGS. 1 and 4, the front and rear center pipes 2
On the rear side of the central part of
Brackets 8 and 9 are welded to the front lower portion and the rear lower portion of the seat rail 3, and a bracket 10 is welded to the upper portion 4a of the rear frame 4. Each bracket 8, 9, 10
The mounting holes 8a, 9a, 10a are bored in each of them, and the nuts 8b, 9b, 10b are respectively fixed thereto.

As shown in FIG. 1 and FIG. 5, the exhaust muffler 5 includes a connecting tubular portion 5a having a modified cross section in which a rear end portion 6a of the exhaust pipe 6 is inserted and fixed, and an internal silencer for noise reduction. Substantially cylindrical main body 5 with expansion chamber formed
It consists of b and.

As shown in FIGS. 5 and 6, a bracket 11 corresponding to the bracket 7 of the center pipe 2 is provided on the exhaust pipe 6 so as to project laterally. A mounting hole 11a is formed in the bracket 11 and a nut 11b is fixedly attached thereto. With the surface 11c of the bracket 11 brought into contact with the surface 7b of the bracket 7, the brackets 7 and 11 are fixed to the bolt 12 (see FIG. 10). (See above) and the nut 11b.

As shown in FIGS. 5 and 8, the exhaust muffler 5
A bracket 13 corresponding to the bracket 8 of the seat rail 3 is welded to the upper front side of the connecting tubular portion 5a. The bracket 13 is provided with a mounting hole 13a that matches the mounting hole 8a of the bracket 8.
Can be connected with the bolt 14 (see FIG. 10) and the nut 8b.

As shown in FIGS. 5 and 9, the exhaust muffler 5
Patches 15 to 18 as reinforcing members for increasing the rigidity of the main body 5b are welded to the outer periphery of the main body 5b. A bracket 19 corresponding to the bracket 9 is welded on the patch 18 at the upper center of the main body 5b. A mounting hole 19a is formed in the bracket 19 so as to match the mounting hole 9a of the bracket 9, and the brackets 9 and 19 can be coupled with each other by a bolt 20 (see FIG. 10) and a nut 9b.

As shown in FIGS. 5 and 7, the patch 21 is welded on the lower curved surface of the connecting tubular portion 5a, and the bracket 22 corresponding to the bracket 10 is welded on the patch 21. The bracket 22 is provided with a mounting hole 22a that matches the mounting hole 10a of the bracket 10. As shown in FIG. 3, the bracket 10 is put inside the bracket 22, and the outer surfaces of the side walls 10c and 10c of the bracket 10 are brought into contact with the inner surfaces of the side walls 22b and 22c of the bracket 22, respectively. Both brackets 10 and 22
Can be connected with the bolt 23 (see FIG. 10) and the nut 10b.

The operation will be described below.

The procedure for assembling the exhaust muffler 5 will be described.

Bracket 13 for connecting tubular portion 5a of exhaust muffler 5
Is applied to the bracket 8 of the seat rail 3, and the brackets 8 and 13 are connected by the bolt 14 and the nut 8b as shown in FIGS. 1 and 10. Next, the bracket 19 of the main body portion 5b of the exhaust muffler 5 is attached to the seat rail 3
The bracket 9 and the both brackets 9 and 19 as shown in FIG. 1 and FIG.
Combine with. And the bracket 1 of the rear frame 4
0 is placed inside the bracket 22 as shown in FIG. 3 and the outer side surfaces of both side walls 10c, 10c of the bracket 10 are brought into contact with the inner side surfaces of both side walls 22b, 22c of the bracket 22, respectively. The brackets 10 and 22 are shown in FIGS.
As shown in the figure, the bolt 23 and the nut 10b are connected to each other.

Further, the surface 11 of the bracket 11 of the exhaust pipe 6
c is brought into contact with the surface 7b of the bracket 7 of the center pipe 2, and in this state, the brackets 7 and 11 are attached as shown in FIGS.
As shown in FIG. 0, bolts 12 and nuts 11 are used for connection.

In this way, with the exhaust muffler 5 arranged between the seat rail 3 and the rear frame 4 as shown in FIG. 11, the upper side of the exhaust muffler 5 is attached to the seat rail 3 at two front and rear positions. The lower side of the exhaust muffler 5 is detachably attached to the upper part 4a of the rear frame 4, and the exhaust pipe 6 having the rear end portion 6a connected and fixed to the exhaust muffler 5 is detachably attached to the center pipe 2, respectively.
As a result, the exhaust muffler 5 constitutes a part of the vehicle body frame of the motorcycle 1 together with the center pipe 2, the seat rail 3 and the rear frame 4 as a strength member.

(Effects of the Invention) As described above in detail, according to the exhaust muffler support structure in the motorcycle of the present invention, the exhaust muffler is arranged between the seat rail and the rear frame, so that the exhaust muffler is disposed. Since it also serves as a strength member of the body frame, it is not necessary to install a special strength member between the seat rail and the rear frame, and the number of parts can be reduced by that much, so that the structure is simplified and the rigidity of the body frame is increased. Also, it is possible to reduce the weight of the entire vehicle body while maintaining the muffling performance of the exhaust muffler. Moreover, the exhaust muffler does not project to the outside of the vehicle body and does not extend to the rear of the vehicle body for a long time. And the entire body can be made compact in the left-right and front-rear directions.

At least two front and rear portions on the upper side of the exhaust muffler are detachably attached to the seat rail, and the lower side of the exhaust muffler is detachably attached to the upper part of the rear frame, so that the exhaust muffler can be detached from the vehicle body frame. Thus, the maintenance can be easily performed.

[Brief description of drawings]

1 to 11 show an embodiment of the present invention,
FIG. 1 is a plan view showing a main part of the present invention, FIG. 2 is a schematic view showing a motorcycle to which the present invention is applied, and FIG. 3 is a view of FIG.
III arrow view, FIG. 4 is an enlarged plan view showing a part of the vehicle body frame, FIG. 5 is an enlarged plan view showing an exhaust muffler and an exhaust pipe, and FIG. 6 is a cross section taken along line VI-VI in FIG. Fig.7, Fig. 7 is a view taken in the direction of arrow VII in Fig. 5, Fig. 8 is a view in Fig. 5
Sectional view taken along line VIII-VIII, FIG. 9 is a sectional view taken along line IX-IX in FIG. 5, FIG. 10 is a perspective view of FIG. 1 seen from the rear side, and FIG. 11 is shown in FIG. XI arrow view, FIG. 12 is a schematic explanatory view showing a conventional example, and FIG. 13 is a schematic explanatory view showing another conventional example. 2 ... Center pipe, 3 ... Seat rail, 4 ... Rear frame, 4a ... Upper part, 5 ... Exhaust muffler, 6 ... Exhaust pipe.

Claims (1)

[Scope of utility model registration request] 1. A center pipe, a seat rail having a front end fixed to an upper end side of the center pipe, and a rear frame having a front end fixed to a lower end side of the center pipe and extending diagonally upward toward the seat rail. The exhaust muffler is disposed between the seat rail and the rear frame, and at least two positions on the upper side of the exhaust muffler are detachably attached to the seat rail, and the lower side of the exhaust muffler is A support structure for an exhaust muffler in a motorcycle, which is detachably attached to an upper portion of a rear frame.