JPH06286679A - Frame structure of motorcycle and manufacture of frame - Google Patents

Abstract

PURPOSE:To enable the whole vibration preventing composition to abut against even a complicatedly shaped frame member evenly with nearly uniform press force and to improve effect of vibration prevention. CONSTITUTION:An elastic material made base plate 6 is formed with a plurality of elastic material made lugs 7 in the nearly upright condition to form a vibration preventing composition 5. The vibration preventing composition 5 is attached into a hollow frame member 1 to provide a frame structure for a motorcycle so that the tip of each lug 7 presses against the inner peripheral surface of the frame member 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a main frame of a motorcycle or a frame such as a swing arm,
In particular, the present invention relates to a frame structure including a hollow frame member equipped with a vibration isolating member and a frame manufacturing method.

[0002]

2. Description of the Related Art Conventionally, there are the following two examples of a frame structure in which vibration generated on the frame side due to driving of an engine is suppressed by a vibration isolating member. (First Conventional Example) In the example shown in FIGS. 9 and 10, a pair of half members 32 and 33 are welded to form a hollow frame member 31.
In this example, a flat plate-shaped anti-vibration rubber 34 is pressure-bonded to the side surface of the half member 33 on the inner side of the vehicle body with a pressing plate 35 and bolts 36, thereby changing the resonance frequency of the frame member 31. I am letting you. As a prior art document of this type, there is JP-A-3-220079. (Second Conventional Example) In the example shown in FIGS. 11 and 12, a pair of half members 42 and 43 are welded to form a hollow frame member 4.
1 has a structure in which a vibration-proof rubber body 44 having substantially the same cross-sectional shape as the frame member 41 is inserted into the internal space through the end opening of the frame member 41. As a prior art document of this kind, there is a utility model Japanese Utility Model Publication No. 1-106390.
There is an issue.

[0003]

[Problems to be Solved by the Invention]

(Problem of the first conventional example) In a motorcycle, as shown in FIG. 1, a main frame M or a swing arm S is used.
From the viewpoint of protecting the outer appearance of the frame, etc., of the two half members as shown in FIG.
The anti-vibration rubber 34 can be attached only to No. 3. Therefore, although the resonance frequency changes as described above, the damping force is insufficient and the vibration damping effect is insufficient.
Moreover, when the frame member 31 has a complicated shape, it becomes difficult to manufacture the vibration-proof rubber 34 and the pressing plate 35 in a shape corresponding to the complicated shape. (Problem of the second conventional example) In FIG.
Considering the workability when inserting the frame into the frame member 41, it is necessary to provide a clearance between the frame member 41 and the anti-vibration rubber 44. Anti-vibration rubber body 4
4 and the inner peripheral surfaces of the frame member 41 do not come into full contact with each other, so that the vibration damping effect is insufficient. Moreover, when the frame member 41 has a complicated shape, the insertion work becomes more difficult even if the clearance is taken.

It is an object of the present invention to make it possible for the entire vibration-isolating structure to abut against a frame member having a complicated shape with a substantially uniform pressure contact force without being biased. Is to improve. Further, improvement of manufacturing workability is also one of the objects of the present invention.

[0005]

The frame structure of the present invention forms a vibration-proof structure by forming a large number of elastic material projections on a base plate made of elastic material in a substantially upright state, thereby forming a hollow structure. The antivibration structure is mounted in the frame member such that the tips of the protrusions are in pressure contact with the inner peripheral surface of the frame member. In addition, the frame manufacturing method,
In a frame manufacturing method for forming a hollow frame member by joining a pair of half-divided members, a plurality of elastic material projections are formed on an elastic material base plate in a substantially upright state. After arranging the body between the two half-divided members so that the respective projections are in pressure contact with the inner peripheral surface of the half-divided member, the two half-divided members are joined together.

[0006]

FIG. 1 is a schematic left side view of a motorcycle to which the present invention is applied. As a frame, a main frame M, a swing arm S, a rear arm R, etc. are provided, and the main frame M is , Head pipe to engine E
It has a pair of left and right frame members 1 that pass through the upper side to reach the vicinity of the rear wheel pivot portion P, a down tube B that supports the engine E, and the like. The swing arm S for supporting the rear wheels is rotatably supported by the pivot part P,
It extends backwards.

FIG. 2 is a plan view showing only the frame member 1 on the left side of the main frame M. The front portion on the head pipe side extends obliquely rearward to the left and the middle portion extends substantially straight rearward and rearward. The side portion extends rearward so as to be displaced slightly inward of the vehicle body, and as a whole, is formed in a curved shape that bulges outward (leftward) when viewed from above. The frame member 1 is formed in a hollow shape by connecting the outer half member 2 and the inner half member 3, and the inside of the hollow frame member 1 is the main part of the present invention. The anti-vibration structure 5 as a part is mounted in a compressed state.

FIG. 4 is a sectional view taken along line IV-IV of FIG.
The two half-divided members 2 and 3 each have a bent portion for joining at the upper and lower ends thereof, and the cross-sectional shape of the side surface of the outer half-divided member 2 is formed in a generally “F” shape. On the side surface of the side half member 3, for example, a recess 3a for improving strength is formed. The anti-vibration structure 5 is composed of a flexible base plate 6 and a large number of anti-vibration protrusions 7 formed integrally with the base plate 6 and the base plate 6 and the protrusions 7.
Is made of an elastic material having heat resistance, for example, heat resistant rubber. In the embodiment shown in FIG. 4, the anti-vibration protrusions 7 are arranged only on one side of the base plate 6.
On the other surface, a flat columnar stabilizing projection 10 and a positioning projection 12 are integrally formed. The base plate 6 is
It is arranged on the side surface of the inner half-split member 3 and abuts on the concave portion 3a, the stabilizing projection 10 abuts on the side surface portion between the concave portions 3a, and the positioning projection 12 makes the inner half-split member 3 contact. It is fitted in the positioning hole 13 of. The anti-vibration protrusion 7 is formed in a columnar shape that extends in a direction substantially perpendicular to the base plate 6, and the tip end portion 7a is formed in a spherical shape. The whole area of the body 5 is pressed against the inner peripheral surface of the outer half-split member 2 with a substantially uniform compression amount. Therefore, the heights of the protrusions 7 are not all uniform, but change according to the side surface shape of the corresponding outer half member 2.

In FIG. 5, D1 is the width between the half members 2, 3, D2 is the height of the projection 7 in the free state plus the thickness of the base plate 6, and the compression margin of the projection 7 For example, d is uniformly set to 3 mm, and as described above, the width D1 changes depending on each place.

Next, the manufacturing method will be described. As shown in Figure 3,
Before connecting the two half members 2 and 3, the base plate 6 portion of the vibration isolating structure 5 is fitted into the inner half member 3. At this time, the vibration-proof component 5 is positioned by inserting the positioning protrusion 12 into the positioning hole 13. After mounting the anti-vibration structure 5 on the inner side surface of the inner half-split member 3 as described above, the outer half-split member 2 is superposed on the inner half-split member 3 as shown in FIG. A certain amount of each protrusion 7 is compressed by the side surface of the outer half-split member 2, and in this state, the overlapping portions are joined by welding (W).

[0011]

[Another embodiment]

(1) The vibration isolating structure 5 shown in FIG. 6 is an example in which columnar vibration isolating projections 7 are provided on both side surfaces of the base plate 6, and at the time of mounting, the projections 7 are formed in the respective half members 2 and 3. Abuts the inner peripheral side surface. (2) The anti-vibration structure 5 shown in FIG.
In this example, a conical projection 7 is provided upright. (3) The antivibration structure 5 shown in FIG.
In this example, a large number of projection fitting holes 20 are formed, and both rod-shaped projections 7 are fitted into the projection fitting holes 20 in a protruding shape. (4) Swing arm S or rear arm R of FIG.
It is also possible to mount each of the vibration isolation components 5 shown in FIG. 4, FIG. 6, FIG. 7 or FIG. (5) As a joining means for joining the half-divided members, in addition to welding, it can be applied to a frame structure employing a bolt fastening means.

[0012]

As described above, in the frame structure according to the present invention, the base plate 6 made of an elastic material is provided with a large number of the vibration-proof projections 7 made of the elastic material in a substantially upright state. Since the structural body 5 is formed and the vibration isolating structural body 5 is mounted in the frame member 1 so that the tips of the protrusions 7 are in pressure contact with the inner peripheral surface of the hollow frame member 1, Compared with the conventional single-sided attachment type as shown in FIGS. 9 and 10 or the surface contact type as shown in FIGS. 11 and 12, the protrusions 7 can be pressed uniformly over the entire area of the arrangement area of the vibration-proof component 5. It is possible to obtain high anti-vibration performance. In particular, even when it is mounted on the frame member 1 having a complicated shape, it is possible to easily press the projections 7 uniformly over the entire area of the disposition of the vibration isolating structure 5 without causing uneven contact. Anti-vibration performance can be obtained.

Further, according to the frame manufacturing method of the present invention, since the vibration isolating structure 5 is sandwiched between the two half members 2 and 3, the two half members 2 and 3 are connected to each other. It is possible to reduce the falling phenomenon of the protrusions 7 and to easily set the anti-vibration structure 5 at a predetermined position, so that the mounting workability is improved.

[Brief description of drawings]

FIG. 1 is a schematic left side view of a motorcycle to which the present invention is applied.

FIG. 2 is a plan view of a left frame member of the main frame.

FIG. 3 is an exploded perspective view of FIG.

4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is an enlarged partial view of a vibration damping structure.

FIG. 6 is a partial plan view showing a modified example of the vibration damping structure.

FIG. 7 is a partial plan view showing another modified example of the vibration damping structure.

FIG. 8 is a plan partial view showing still another modified example of the vibration damping structure.

FIG. 9 is an exploded perspective view of a conventional example.

10 is a vertical cross-sectional view of the frame of FIG.

FIG. 11 is an exploded perspective view of another conventional example.

12 is a vertical cross-sectional view of the frame of FIG.

[Explanation of symbols]

 M Main frame (an example of frame) S Swing arm (another example of frame) 1 Frame member 2,3 Half-divided member 5 Anti-vibration structure 6 Base plate 7 Anti-vibration protrusion

Claims (2)

[Claims] 1. A vibration-isolating structure is formed by forming a large number of protrusions made of an elastic material on a base plate made of an elastic material in a substantially upright state. A frame structure for a motorcycle, wherein the vibration isolating structure is mounted in a frame member such that the tips of the protrusions are in pressure contact with each other. 2. By connecting a pair of half members,
In a frame manufacturing method for forming a hollow frame member, a vibration-isolating structure in which a large number of elastic material projections are formed in an upright state on a base plate made of elastic material A method for manufacturing a frame for a motorcycle, comprising arranging between the two half-divided members so that they are pressed against the peripheral surface, and then joining the two half-divided members.