JP3344674B2 - Motorcycle motorcycle intake system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake device for a motorcycle.

[0002]

2. Description of the Related Art Japanese Patent Publication No. Hei 5-30675 discloses a front frame that supports a front wheel at a front end and supports a seat at a rear end, a front end fixed to the front frame, and a pair of right and left rear parts. The motorcycle includes a rear fork extending downward, a power unit supported below the rear fork, and an air cleaner arranged to overlap the side of the power unit.

[0003]

However, in the case of the above structure, if the capacity of the air cleaner is to be increased without changing the vertical dimension, the air cleaner must be widened outward in the vehicle width direction. Will be increased. Therefore, it is desired that the capacity of the air cleaner can be increased without increasing the vehicle width.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a motorcycle air intake system according to the present invention includes a front frame supporting a front wheel at a front end and extending in the front-rear direction. The rear fork has a front end fixed and extends substantially horizontally rearward as a pair of left and right, and supports a rear wheel at a rear end, and a rear part of the front frame and a rear part of the rear fork.
In a motorcycle provided with a rear stay connecting end portions and a power unit supported below the rear fork, a frontmost portion of a rear wheel is positioned rearward of a rear end portion of the power unit, and is located near an upper portion of the rear fork. An air cleaner whose width in the left-right direction is almost the same as the separation width of the left and right rear forks is arranged so that the front frame projects downward from the middle part.
The saddle part is bent to the rear, and the rear part extends upward to support the seat
And secure the front end of the rear fork to the saddle
The rear of these front frames, the rear fork and the rear wheels
A space for disposing an air cleaner is formed therebetween .

[0005]

[Action] to be extended rearward substantially horizontally in the left-right pair by fixing the front end of the rear fork to the front frame, after the front frame
And the rear end of the rear fork are connected by a rear stay, and when the frontmost part of the rear wheel is positioned behind the rear end of the power unit supported below the rear fork, A relatively large article disposition space having an enlarged front-rear direction can be secured between the rear portion of the front frame, the rear fork, and the rear wheel . Therefore, if an air cleaner having a width in the left-right direction substantially equal to the width of the left and right rear forks is disposed in the article placement space, the capacity of the air cleaner can be increased without increasing the vehicle width more than necessary.

[0006]

An embodiment will be described with reference to the drawings. FIG. 2 is a left side view of the entire motorcycle according to the embodiment. In this figure, a front wheel 2 is supported via a front fork 4 in front of a substantially U-shaped front frame 6.

The front frame 6 has a head pipe 8 at the front end.
A front portion 10 extending obliquely downward and backward, a saddle portion 12 bent at an intermediate portion of the front frame 6 and projecting downward to form a minimum ground clearance, and a rear portion 14 extending obliquely upward and rearward form a continuous shape. . A frame cover 16 is attached to the front part 10 in the length direction, and mainly covers the lower side of the front part 10.

A lower cover 18 is connected to the saddle portion 12 so that the rear end and the front end of the frame cover 16 are connected to each other.
The battery 20, the relay 22, and the CDI unit 24 are housed inside and are covered by the lower cover 18, and these housing parts are supported on the saddle portion 12.

A saddle-shaped seat 28 is supported at the upper end of the rear portion 14 via a seat post 26 which can be extended and contracted up and down. A relatively large article placement space S1 is formed between the rear portion 14 and the rear fender 30.

A fuel tank 32 is accommodated in the upper part of the article placement space S1 by being supported by a rear plate 14 and a cross plate (not shown) bridged between a pair of left and right rear stays 60 (described later). An oil tank 34 and an air cleaner 36 are housed side by side in the vertical direction.

A carburetor 38 is disposed at a position overlapping the frame cover 16 in a side view, and a side cover is provided between the rear portion 14 and the rear fender 30 so as to cover the fuel tank 32, the oil tank 34, the air cleaner 36, and the carburetor 38. 40 are attached. The side cover 40 may be either integral with or separate from the lower cover 18.

A power unit 44 is placed substantially horizontally below the hanger 42 via a hanger 42 and an anti-vibration link 43 (see FIG. 1) rotatably mounted on the hanger 42 using an anti-vibration bush 42a. It is supported vertically long in the front-rear direction. 43a is a stopper cushion. An exhaust pipe 46 extends from the front to the rear below the power unit 44.

A chain 52 wound around a drive sprocket 50 in a transmission case 48 provided at a rear portion of the power unit 44 extends obliquely upward and rearward and is wound around a driven sprocket 54. A belt-type transmission is provided in the transmission case 48 and is covered with a bell-con cover 47.

The rear wheel 56 includes a rear fork 58 extending substantially horizontally rearward from the saddle portion 12, and a rear portion 14 and a rear fork 58.
The rear frame 62 is supported by a rear frame 62 which is composed of a rear stay 60 for connecting the rear end of the rear frame diagonally. The frontmost portion of the rear wheel 56 is lowered to a position rearward from the rear end of the transmission case 48.

FIG. 1 is an enlarged side view showing a support structure of the power unit 44, and FIG. 3 is a view showing the opposite side (right side) together with the entire structure of the frame. FIG. 4 shows the relationship between the air cleaner 36 and the carburetor 38 in the upper direction (the direction indicated by the arrow X in FIG. 1).
FIG.

As is apparent from these figures, the rear fork 58 is much longer than the conventional motorcycle, and is located above and behind the right and left rear forks 58.
A relatively large article placement space S1 having sufficient dimensions in the front, rear, left, and right directions is formed between the rear fender 30 and the rear fender 30.

A mount 49 provided at the rear of the transmission case 48 is connected to a stay 59 projecting downward at an intermediate portion of the rear fork 58 with a hanger bolt 64, and the power unit 44 is suspended below the rear fork 58. Lowered favored.

For this reason, the tension side (upper side) of the chain 52 wound around the drive sprocket 50 located below the rear fork 58 crosses the rear fork 58 in a side view and overlaps with the hanger bolt 64 (see FIG. 4). (Fig. 3). The mount 49, the stay 59 and the hanger bolt 64 constitute a rear engine hanger pivot portion.

When the tension side of the chain 52 is overlapped with the engine hanger pivot portion, the tension of the chain 52 absorbs the tension of the chain 52 at the engine hanger pivot portion without affecting the movement of the anti-vibration link 43. It becomes a structure suitable for.

As is apparent from FIG. 1, the rear fork 58
Is overlapped on the outside of the vaporizer 38 in a side view, and a stop screw 66 and a drain bolt 67 as adjustment screws are vertically separated, and a rear fork 58 is passed between them in the front-rear direction.

For this reason, the adjusting screws (66, 67) do not overlap with the rear fork 58, and maintenance from the side is facilitated. The downstream side of the carburetor 38 is connected to a crankcase 69 of a two-stroke engine constituting the power unit 44 by an intake pipe 68, and the crankcase 69
The intake air is pre-compressed inside.

Cylinder shroud 7 surrounding cylinder 70
A hot air duct 74 is provided obliquely upward and rearward from the side of 2, and its outlet 75 is directed to the carburetor 38, thereby preventing overcooling of the carburetor 38. Symbol 39
Is an insulator, and 68a is a connection portion of the intake pipe on the carburetor side.

The hot air duct 74 forms an L cover integrally with the cylinder shroud 72 and the recoil starter cover 78. The hot air duct 74 is covered with a detachable duct cover 76 and is detachable with a screw 79. In this case, since each cover can be integrated, the number of parts can be reduced, and the assembling work can be facilitated.

As is apparent from FIG.
The clean side 37b has a narrow portion 35a at the front,
The left-right width is narrower than the rear part 35b. This narrow part 3
A vaporizer installation space S2 is formed on the side of 5a and in front of the rear portion 35b. The vaporizer 38 is provided in the vaporizer arrangement space S2.
Is disposed, and the upstream side of the vaporizer 38 is the clean side 37.
b is connected to the front surface of the rear portion 35b.

The maximum left and right width of the air cleaner 36 is a portion including the rear portion 35b of the clean side 37b, and is substantially the same as the separation width of a pair of rear forks 58 which are separated in a forked shape and parallel to each other. And is supported by the stays 36d and 36e (see FIG. 1) attached to the power unit 44 side. Vaporizer 38
Are also located between the left and right rear forks 58.

Reference numeral 36a in the figure denotes an inlet formed obliquely downward on the front surface of the dirty side 37a, from which air introduced into the air cleaner 36 is purified by an air filter 36b and connected to an outlet (not shown). The supplied tube 36c is supplied to the vaporizer 38.

5 to 8 are views for explaining the frame cover 16, FIG. 5 is an enlarged side view, FIG. 6 is a view taken in the direction of the arrow Z in FIG. 5, and FIG. 7 is a sectional view taken along the line 7-7 in FIG. FIG. 8 is a sectional view taken along line 8-8 in FIG.

In these figures, the frame cover 16
Has a front end portion 80 and a rear end portion 82 that open substantially downward at both ends, an intermediate portion 84 that opens substantially upward, and a bottom portion 86 that is provided only in the intermediate portion 84 has a longitudinal direction. , A slit 88 is formed to extend to the right side.

The frame cover 16 is integrally formed of a suitable plastic and has a substantially uniform thickness. The frame cover 16 is provided with bolt through holes 81a and 83a provided in the mounting portions 81 and 83 of the front end portion 80 and the rear end portion 82, respectively. It is attached to the front part 10 by bolts 85 (see FIG. 7, the rear end part 82 has the same structure).

As is apparent from FIGS. 7 and 8, the lower portions of the front end portion 80 and the rear end portion 82 are open and have no bottom portion.
Conversely, tops 80a and 82a are provided.

As shown in FIG. 8, the harness 90 can be accommodated in the frame cover 16 without any special support. The harness 90 includes the battery 20, the headlight 92, the instruments 94, and the horn 96 shown in FIG.
And other electrical components. Therefore, the frame cover 16 serves as a cover for the front part 10 and also functions as a harness cover.

When the frame cover 16 is configured as described above, the front cover 10 is elastically deformed as shown in FIG. 8 by covering the front cover 10 with the front cover 10 in the direction indicated by the arrow Z in FIG. Then, the slit 88 is expanded to enter the inside, and then the intermediate portion 84 and the bottom portion 86 return to their original shapes, so that they can be easily attached.

A conventional cover of this type is formed in advance into a flat shape provided with a thin portion, and is bent at the thin portion to form a three-dimensional shape. In this case, the thin portion is easily whitened when bent. For this reason, it was difficult to use repeatedly, and there was a possibility that appearance might be spoiled. However, according to the present embodiment, such a fear is eliminated, and the durability and appearance are improved.

In addition, the top portions 80a, 82 which are closed portions
a and the bottom portion 86 are provided alternately up and down, and they are prevented from overlapping in the die-cutting direction (the direction indicated by the arrow Y in FIG. 5), and open portions are provided on the opposite sides of the respective closed portions. The frame cover 16 can be easily formed by using a split mold that is matched in the direction of the arrow.

Next, the operation of this embodiment will be described. As is evident in FIG. 2, the front frame 6 forms the side surface substantially U-shape, fixed to the front end of the rear fork 58 in the saddle 12, before
The rear part 14 of the part frame 6 and the rear end of the rear fork 58
Since the rear wheel 56 is connected by the rear stay 60 and the rear end of the rear fork 58 is supported by the rear end of the rear fork 58 so that the foremost part is located rearward of the rear end of the transmission case 48, A relatively large article placement space S1 that is enlarged in the front-rear direction with the rear fender 30 can be formed. In addition, since the power unit 44 can be arranged closer to the rear fork 58, the minimum ground clearance of the vehicle body can be further increased.

At this time, since the rear fork 58 can be made sufficiently long by fixing the rear fork 58 to the saddle portion 12, the rear wheel 56 is connected to the power unit 44 as described above.
In addition, it is easy to make the arrangement lowered rearward, and it is easier to secure a relatively large article arrangement space S1.

Therefore, if the air cleaner 36 in which the maximum left-right width of the portion including the clean side 37 is substantially the same as the separation width of the pair of rear forks 58 is accommodated in the article placement space S1, the body width becomes more than necessary. A large-capacity air cleaner 36 can be provided without enlargement. In this case, the capacity of both the entire air cleaner 36 and the clean side 37b can be increased. Further, since there is a margin in the front-rear direction, it is easy to secure a required size without reducing the area of the air filter 36b. Note that this article placement space S1
In this case, not only the air cleaner 36 but also the fuel tank 32 and the oil tank 34 can be vertically arranged and accommodated.

Further, as is apparent from FIG. 4, a narrow portion 35a is provided at the front of the air cleaner 36, and the narrow portion 35a is provided.
a and the vaporizer installation space S formed by the clean side 37
2, the carburetor 38 can be disposed so as to fit in the vicinity of the air cleaner 36 and inward of the rear fork 58 (toward the center of the vehicle body). As a result, the vehicle body is not enlarged. it can.

In addition, since most of the carburetor 38 and the air cleaner 36 are located above the rear fork 58,
Since it is arranged at a relatively high position above the power unit 44, the arrangement structure is advantageous for jumping up from the ground such as muddy water.

It should be noted that the present invention is not limited to the above embodiment, and various applications are possible. For example, the air cleaner 36 may be disposed higher and supported by the rear stay 60 instead of the rear fork 58. Further, the side view shape of the front frame may be a sharply bent shape close to a V-shape.

[0041]

Effects of the Invention to be extended to the front end of the rear fork in a left-right pair are fixed to the front frame rearward substantially horizontally, front frame
The rear end of the rear fork with the rear end of the rear fork.
Together with that, since positions the foremost part of the rear wheel is also backward from the rear end portion of the power unit is supported to the lower side of the rear fork, a relatively large article disposed to the front-rear direction above the vicinity of the rear fork is expanded Space can be secured.

As a result, by arranging an air cleaner having a width in the left-right direction substantially equal to the separation width between the left and right rear forks in the article disposing space, a large capacity air cleaner can be provided without increasing the vehicle width more than necessary. Can be In addition, since the power unit can be disposed closer to the rear fork, the minimum ground clearance of the vehicle body can be increased.

When the front end of the rear fork is fixed to the saddle portion of the front frame, the rear fork can be made sufficiently long. Therefore, the front end of the rear wheel is disposed lower than the rear end of the power unit. That will be easier,
It is easier to secure a large article placement space.

Further, a cutout portion is provided on a side portion of the air cleaner, and a carburetor is disposed in a carburetor installation space formed by the cutout portion. When the carburetor is disposed between the left and right rear forks near the air cleaner. The vehicle body can be prevented from being enlarged. In addition, since the vaporizer and the air cleaner are arranged at a relatively high position above the power unit, the arrangement structure is advantageous for splashing up muddy water from the ground.

[Brief description of the drawings]

FIG. 1 is an enlarged left side view of a main part of an embodiment.

FIG. 2 is an overall side view of the motorcycle according to the embodiment.

FIG. 3 is a right side view of a main part of the embodiment.

FIG. 4 is a diagram showing a main part of the embodiment from an arrow X in FIG. 1;

FIG. 5 is a side view of a main part of the embodiment.

FIG. 6 is a view showing a main part of the embodiment from a Z arrow in FIG. 5;

FIG. 7 is an enlarged sectional view taken along line 7-7 in FIG. 5;

FIG. 8 is an enlarged sectional view taken along line 8-8 in FIG. 5;

[Explanation of symbols]

6: Front frame, 12: Saddle, 14: Rear, 36: Air cleaner, 38: Vaporizer, 44: Power unit, 5
8: Rear fork, 56: Rear wheel

Claims (2)

(57) [Claims] 1. A front frame which supports a front wheel at a front end and extends in the front-rear direction, a front end is fixed to the front frame, and a pair of left and right sides extend substantially horizontally rearward to form a rear wheel at a rear end. Rear fork to support and behind the front frame
A motorcycle having a rear stay for connecting the rear fork and a rear end of the rear fork, and a power unit supported below the rear fork, wherein the frontmost part of the rear wheel is located behind the rear end of the power unit. An air cleaner whose width in the left-right direction is almost the same as the separation width of the left and right rear forks is placed near the upper part of the rear fork , and the front frame is bent so that the middle part projects downward.
The saddle part, the rear part extends upward to support the seat
The front end of the rear fork is fixed to the saddle,
Air between the rear of the front frame, the rear fork and the rear wheel
An intake device for a motorcycle, wherein a space for disposing a cleaner is formed . (2) Reduce the width in the left-right direction on the side of the air cleaner.
A hole is provided and the air created by this hole is
A contractor characterized by installing a vaporizer in the space where the vaporizer is installed.
Request1 noteOn-board motorcycle air intake system.