JP2001058591A - Rear unit structure of motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable manifestation of plural functions by one part, and to aim at cost reduction by the reduction of number of parts and to plan miniaturization of car body by installing an air cleaner mechanism in a swing arm and by supplying an air being cleaned by an air cleaner mechanism to a carburetor of an engine. SOLUTION: In motorcycle 1 of motor scooter type, a swing arm 3a supports a rear-wheel 2 with a two-way arm at a free oscillation. By assembling an air cleaner mechanism in the left side swing arm 3a and by assembling a muffler mechanism in the right side swing arm, plural functions by one part are manifested. The swing arm 3a in which the air cleaner mechanism is installed is composed so that press-molded product of two pieces of right and left where it is formed from an intermediate swelling part of steel plate, and it is composed as a sandwiched structure by welding the peripheral part. In this way, not only a suspension function but also an air cleaner function and muffler function are obtained, and the cost reduction by the reduction of number of parts and the miniaturization of car body can be attained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a rear unit structure of a motorcycle such as a scooter.

[0002]

2. Description of the Related Art Conventionally, a rear unit of a motorcycle such as a scooter has an engine 52 disposed near left and right swing arms 51a and 51b for suspending a rear wheel 50, as shown in FIGS. The muffler 53 and the air cleaner 54 connected to the engine 52 are provided as separate parts near the engine 52, respectively.
A rear fender (not shown) that covers a part of the rear fender is also provided as a separate component.

[0003]

However, the structure of the rear unit as in the prior art is similar to that of the swing arms 51a, 51a.
The b, muffler 53, air cleaner 54, and rear fender are all separate structures, so a large number of parts, including those attached to them, are required. However, there is a problem that the weight is easily increased.

Accordingly, an object of the present invention is to reduce the number of components of the rear unit to reduce the manufacturing cost and the assembly cost, and to reduce the size and weight of the vehicle body.

[0005]

According to the present invention, an air cleaner mechanism is incorporated in a swing arm of a motorcycle.

As described above, if the air cleaner mechanism is incorporated in the swing arm and the air cleaned by the air cleaner mechanism is supplied to the carburetor of the engine,
One part can simultaneously perform the two functions of the rear suspension function and the air cleaning function, thereby reducing the number of parts, the manufacturing cost and the assembly cost, and reducing the size of the vehicle body.

Here, in order to incorporate the air cleaner mechanism into the swing arm, for example, a method of joining two steel plates or the like having a bulging portion formed by press molding to form an intake chamber in an intermediate portion, or the like. Can be adopted.

According to a second aspect, a muffler mechanism is incorporated in a swing arm of a motorcycle.

As described above, if the muffler mechanism is incorporated in the swing arm and the exhaust gas exhausted from the engine is sent in, the rear suspension function and the silencing function can be simultaneously performed by one component, and the number of components can be reduced. Reduction, manufacturing cost, and assembly cost can be achieved, and the size and weight of the vehicle body can be reduced.

Here, in order to incorporate the muffler mechanism into the swing arm, a gas pipe is formed by joining, for example, two steel plates having a band-shaped bulged portion by press molding, and an exhaust chamber is formed in an intermediate portion. Can be adopted.

According to a third aspect of the present invention, an air cleaner mechanism and a muffler mechanism are incorporated in a swing arm of a motorcycle.

That is, for example, if the air cleaner mechanism is incorporated in the left swing arm and the muffler mechanism is incorporated in the right air cleaner, the number of parts can be further reduced, the cost can be further reduced, and the size and weight of the vehicle body can be reduced. Can be achieved.

According to a fourth aspect of the present invention, an air cleaner mechanism is incorporated in a rear fender of the motorcycle.

Thus, even if the air cleaner mechanism is incorporated in the rear fender, the number of parts can be reduced, the manufacturing cost can be reduced,
The assembly cost is reduced, and the size and weight of the vehicle body can be reduced. Here, in order to incorporate the air cleaner mechanism into the rear fender, for example, a method of joining two steel plates or fiber-reinforced resin sheets having a bulged portion to form an intake chamber in an intermediate portion can be adopted.

According to a fifth aspect of the present invention, the muffler mechanism is incorporated in the rear fender.

As described above, even when the air cleaner mechanism is incorporated in the rear fender, the number of parts, the manufacturing cost and the assembly cost can be reduced, and the size and weight of the vehicle body can be reduced. Here, in order to incorporate the muffler mechanism into the rear fender, for example, a method of joining two steel plates having a bulging portion to form a gas pipeline and forming an exhaust chamber in an intermediate portion is adopted. I can do it.

According to a sixth aspect of the present invention, an air cleaner mechanism and a muffler mechanism are incorporated in the rear fender.

That is, for example, if the air cleaner mechanism is incorporated in the left rear fender and the muffler mechanism is incorporated in the right rear fender, the number of parts can be further reduced, and the cost and the body size can be further reduced. , Weight reduction can be achieved.

[0019]

Embodiments of the present invention will be described with reference to the accompanying drawings. Here, FIGS. 1 to 6 show examples of the structure of a motorcycle in which an air cleaner mechanism and a muffler mechanism are incorporated in a swing arm. FIG. 1 is an overall view, FIG. 2 is an explanatory view of a swing arm in which an air cleaner mechanism is incorporated, and FIG. 2, FIG. 4 is an explanatory view of a swing arm incorporating a muffler mechanism, FIG. 5 is a sectional view taken along the line BB of FIG. 4, FIG. 6 is a sectional view taken along the line CC of FIG. 7 and 8 are examples of the structure of a motorcycle in which an air cleaner mechanism and a muffler mechanism are incorporated in a rear fender. FIG. 7 is an overall view, and FIG. 8 is a sectional view taken along the line DD of FIG.

In the rear unit structure of the motorcycle according to the present invention, an example in which an air cleaner mechanism and a muffler mechanism are incorporated in a swing arm will be described with reference to FIGS. 1 to 6. A scooter as shown in FIG. Of the swing arm 3a, 3
b is configured to swingably support the rear wheel 2 with a bifurcated arm, and in the embodiment, an air cleaner mechanism is incorporated in the left swing arm 3a, and a muffler mechanism is incorporated in the right swing arm 3b, whereby one component is provided. , So that multiple functions are exhibited.

As shown in FIGS. 2 and 3, the swing arm 3a into which the air cleaner mechanism is incorporated has a structure in which two left and right press-formed products 5 and 6 having a middle portion bulged out of a steel plate or the like are formed into a flat structure. The periphery is welded, and the swelling portion of both forms an intake chamber M, and, for example, a window 6 at the swelling intermediate portion of the outer press-formed product 6.
The air cleaner cover 7 with the intake hole is freely coupled to the window 6h.

A filter 8 is provided inside the suction chamber M, and a cone tube 9 is communicated with the suction chamber M to purify the air sucked from the suction hole of the air cleaner cover 7 with the suction hole. Through the carburetor of the engine (not shown).

Further, two engine connecting portions e are provided on the front side of the swing arm 3a, and the two engine connecting portions e in front of the swing arm 3a are connected to an engine (not shown) to swing the engine. In addition to the above structure, the rear end of the swing arm 3a is structured so that a chain can be pulled.

As shown in FIGS. 4 to 6, the swing arm 3b into which the muffler mechanism is incorporated has two left and right press-formed products 11, each of which has a meandering band-shaped bulging portion formed in the middle of a steel plate or the like. 12 is formed by welding the sides of the bulging portion into a monolithic structure to form a meandering gas pipeline by both of the bulging portions. Several exhaust chambers for noise reduction are provided as shown.

Further, two engine connecting portions e are provided on the front side of the swing arm 3b, and two engine connecting portions e in front of the swing arm 3b are connected to an engine (not shown) to swing. In addition to the above structure, the rear end side of the swing arm 3b is structured so that a chain can be pulled.

In the motorcycle constructed as described above, the left and right swing arms 3a and 3b cause the rear wheel 2 to rotate.
Not only the suspension function but also the air cleaner function and the muffler function can be obtained, so that the manufacturing cost and the assembling cost can be reduced by reducing the number of parts, and at the same time, the size and weight of the vehicle body can be reduced.

Next, an example of the configuration of a motorcycle in which the air cleaner mechanism and the muffler mechanism are incorporated in the rear fender will be described with reference to FIGS.

As shown in FIGS. 7 and 8, in the case of this embodiment, the motorcycle 1, the rear fender 13 and the rear wheel 2, which are not shown in the figure, are integrated into one, and A cushion rubber is interposed at the connection between the front part of the unit and the vehicle body side to form a rear cushion structure.

In the rear fender 13, an air cleaner mechanism is incorporated in the left rear fender 13a, and a muffler mechanism is incorporated in the right rear fender 13b. In the case of the embodiment, the left rear fender 1
3a from the fiber reinforced resin sheet, the right rear fender 1
3b is formed from a steel plate.

The air cleaner mechanism of the rear fender 13a on the left side is partially pressurized in a mold by preheating a laminated sheet in which a resin and a long glass fiber are laminated to a temperature higher than the melting point of the resin. An inner cover 14 made of a laminated sheet of resin and long glass fiber is bonded to the back side of the bulged portion by high-frequency welding or the like, and air is suctioned to an intermediate portion. A chamber M is formed. And the structure of this intake chamber M is
This is substantially the same as the above-described example. A window h is provided in the bulging portion of the rear fender 13a, and a filter (not shown) is provided inside the intake chamber M.

The muffler mechanism incorporated in the right rear fender 13b is provided with a rear cover 15 made of a steel plate for forming a gas pipe and an exhaust chamber behind the rear fender 13b made of a steel plate which is pressed into a desired shape. It is joined by a stopper or the like, and the joint is closed with a sealer or the like.

With the above configuration, the rear fender 13 not only functions as a mudguard and a protective cover for the rear wheel 2 but also has an air cleaner function and a muffler function, and is manufactured by reducing the number of parts. The cost and assembly cost are reduced, and the size and weight of the vehicle body are reduced.

The present invention is not limited to the above embodiment. Those having substantially the same configuration as those described in the claims of the present invention and exhibiting the same operation and effect belong to the technical scope of the present invention. For example, left and right swing arms 3a, 3b and rear fenders 13a, 1
An air cleaner mechanism or a muffler mechanism may be incorporated into only one side of 3b. The materials of the swing arms 3a and 3b and the rear fenders 13a and 13b are arbitrary.

[0034]

As described above, in the rear unit structure of the motorcycle according to the present invention, the air cleaner mechanism and the muffler mechanism are incorporated in the swing arm or the rear fender of the motorcycle. As a result, the number of parts, the manufacturing cost and the assembly cost can be reduced, and the size and weight of the vehicle body can be reduced.

[Brief description of the drawings]

FIG. 1 is an overall view of a motorcycle in which an air cleaner mechanism and a muffler mechanism are incorporated in a swing arm in a rear unit structure according to the present invention.

FIG. 2 is an explanatory view of a swing arm in which an air cleaner mechanism is incorporated.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is an explanatory view of a swing arm in which a muffler mechanism is incorporated.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

FIG. 6 is a sectional view taken along line CC of FIG. 5;

FIG. 7 is an overall view of a motorcycle in which an air cleaner mechanism and a muffler mechanism are incorporated in a rear fender in a rear unit structure according to the present invention.

8 is a sectional view taken along line DD of FIG. 7;

FIG. 9 is an assembly diagram of a conventional muffler.

FIG. 10 is an assembly diagram of a conventional air cleaner.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Motorcycle, 2 ... Rear wheel, 3a ... Swing arm, 3
b: swing arm, 13a: rear fender, 13b ...
Rear fender.

Claims (6)

[Claims] 1. A rear unit structure of a motorcycle, wherein an air cleaner mechanism is incorporated in a swing arm of the motorcycle. 2. A rear unit structure of a motorcycle, wherein a muffler mechanism is incorporated in a swing arm of the motorcycle. 3. A rear unit structure of a motorcycle, wherein an air cleaner mechanism and a muffler mechanism are incorporated in a swing arm of the motorcycle. 4. A rear unit structure of a motorcycle, wherein an air cleaner mechanism is incorporated in a rear fender of the motorcycle. 5. A rear unit structure of a motorcycle, wherein a muffler mechanism is incorporated in a rear fender of the motorcycle. 6. A rear unit structure of a motorcycle, wherein an air cleaner mechanism and a muffler mechanism are incorporated in a rear fender of the motorcycle.