JPH0367913B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an air cleaner device for a motorcycle used for off-road use, for example.

(Prior Art) Off-road motorcycles used for racing are manufactured with the aim of improving racing functionality and reducing vehicle weight.
For this reason, the rear fork, which supports the rear wheel at its rear end and is pivotally connected to the vehicle body frame at its base end, is configured to be buffered by a single shock absorber. The upper end portion is connected to a cross member in the width direction of the vehicle body near the pivot base of the rear fork, and the upper end portion is connected to the upper portion of the vehicle body frame to be installed between the vehicle body frame and the rear fork.

FIG. 5 is a plan view showing the arrangement of the main parts of a conventional motorcycle configured with one shock absorber as described above, and 1 is the shock absorber. Buffer 1
is arranged approximately at the center in the width direction of the vehicle body, and its lower end is connected to the cross member of the rear fork (not shown) as described above, and its upper end is connected to the vehicle body frame.
and the rear wheel 3. Engine 2 like this
Since the shock absorber 1 is provided between the and rear wheels 3,
An air cleaner 5 connected to the engine 2 via the carburetor 4 is arranged on either the left or right side of the shock absorber 1.

(Problems to be Solved by the Invention) In the above configuration, the shock absorber and the air cleaner case are arranged side by side in the width direction of the vehicle body, so the capacity of the air cleaner cannot be increased. Because the wheels face out, wide fenders must be installed to protect the shock absorbers from splashing mud.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a motorcycle in which a shock absorber is installed between a body frame and a swingable rear fork that supports a rear wheel. One shock absorber is provided in the vertical direction of the vehicle body between the cross member of the rear fork in the vehicle width direction and the vehicle body frame, and between the engine and the rear wheel, and a shock absorber is provided rearwardly on the outside of the vehicle width direction of the shock absorber. A pair of extending subframes are provided, and an air cleaner case is swingably mounted inside the subframe and located between the shock absorber and the rear wheel, and the air cleaner case and the carburetor are connected to the shock absorber. It is characterized by being connected by a bypass passage.

(Function) First, an air cleaner case is installed between the rear wheel and a shock absorber installed in the vertical direction of the vehicle between the engine and the rear wheels between the cross member of the rear fork in the vehicle width direction and the vehicle body frame. Since the air cleaner case and the carburetor are connected through a passage bypassing the buffer, the capacity of the air cleaner case can be increased.

Then, we installed a pair of subframes extending rearward on the outside of the shock absorber in the vehicle width direction, and placed the air cleaner case inside this subframe.
The subframe protects the air cleaner case from obstacles outside the vehicle body.

Furthermore, since the air cleaner case is mounted so that it can swing, vibrations from the vehicle body tend to concentrate on the carburetor, unlike when the air cleaner case is firmly fixed.
It is possible to avoid problems that are said to be likely to cause engine malfunctions.

(Embodiment) A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a side view showing the main parts of the motorcycle, and FIG. 2 is a plan view showing the arrangement of the main parts excluding the fuel tank and seat.

Reference numeral 10 denotes a vehicle body frame, and a bottom portion 10a of the vehicle body frame 10 is formed substantially horizontally, and a substantially vertical rising portion 10b is continuously formed from the bottom portion 10a.
An engine 12 is mounted on the upper surface of the bottom portion 10a in the lower part of the fuel tank 11, and is screwed and fixed with bolts 12a. The front end of a seat rail 13 extending toward the rear of the vehicle body is integrally connected to the upper end of the rising portion 10b of the vehicle body frame 10, and the seat rail 13 is also coupled to the upper end of a sub-frame 10c extending obliquely upward from the middle of the rising portion 10b. Seat rail 13
support has been achieved. A passenger seat 14 is attached to the upper surface of the seat rail 13. The rear wheel 15 is supported by the rear end of the rear fork 16,
The base end of the rear fork 16 is pivoted by a pivot shaft 18 inserted into the lower bracket 17 of the upright portion 10b of the vehicle body frame 10, and the rear fork 16 is attached to the vehicle body frame 10 using the pivot shaft 18 as a fulcrum.
It can be freely swung up and down. A in Figure 1
The position is the position of the rear fork 16 when a stand (not shown) is erected, and the rear fork 16 is tilted downward by the weight of the rear wheel 15 and the like. The B position is the position of the rear fork 16 under a static load, and the C position is the maximum swing position of the rear fork 16 under a dynamic load due to running the motorcycle.

As shown in Fig. 2, the above rear fork 16 has two side members 16 extending toward the rear of the vehicle body.
a, 16b, and a cross member 16c extending in the vehicle width direction at a position near the pivot base of the rear fork 16. The lower end 19a of the shock absorber 19 is connected to this cross member 16c, the upper end 19b is connected to the upper end of the upright portion 10b of the vehicle body frame 10 to which the front end of the seat rail 13 is fixed, and the shock absorber 19 is connected to the engine 12 and the rear wheels. 1
5, it is installed between the vehicle body frame 10 and the rear fork 16 so as to tilt forward as shown in FIG.
The shock absorber 19 is composed of a hydraulic damper and a coil spring wound around the outer circumference of the hydraulic damper.
Dampens the vertical movement of 6. The mounting position of the shock absorber 19 in the width direction of the vehicle body is, as shown in FIG. 2, offset to either the left or right from the vehicle body axis line N-N, and is not provided on the vehicle body axis line N-N.

In this embodiment, the shock absorber 19 is offset to the left in the vehicle width direction from the vehicle body axis N--N.

Reference numeral 20 denotes an air cleaner, and as is clear from FIG.
It is an upwardly expanding type with larger front and rear dimensions of the upper part.
The air cleaner 20 having such a shape is arranged in a space between the shock absorber 19 and the rear wheels 15 and below the seat 14, and as shown in FIG. The capacity of the air cleaner 20 is increased by increasing the size. As shown in FIG. 3, a pair of hook portions 21a, 2 are provided at the upper end of the rear surface of the air cleaner case 21, which is formed into a hollow box shape.
1a is provided, and this hook portion 21a is engaged with a cross member (not shown) extending over the seat rail 13 to attach the case 21 to the vehicle body. Further, screw holes 21b are provided on both sides of the case 21, and the bracket 10 is fixed to the pair of left and right sub-frames 10c, 10c located on both sides of the case 21.
Insert the screws 22 into holes d and 10d, and fix the case 21 to the vehicle body using the screws 22. As a result, subframe 1
0c and 10c also function as part of the fender.

Here, the air cleaner case 20 is hooked by two upper hook portions 21a, 21a, and
By fixing screws 22 and 22 in two places on the left and right,
It is supported so as to be swingable, that is, it can tolerate some rocking movement.

The cylindrical part 21 is integrated from the front of the cleaner case 21.
c protrudes, this cylindrical portion 21c is curved to the right side, and the rear end of a rubber connecting tube 23 is connected and integrated with the tip, for example, with adhesive, and the tip of the connecting tube 23 protrudes from the rear surface of the engine 12.
are tightly connected by band members 25.

As a result, the air cleaner 20 and the engine 12 are connected via the carburetor 24, and as shown in FIG.
6 curves and bulges to the right in the vehicle body width direction by a curved cylindrical portion 21c and a flexible connecting tube 23;
The passage 26 is detoured to avoid interference with the buffer 19. As described above, since the shock absorber 19 is provided at a position offset to the left in the vehicle width direction from the vehicle body axis N--N, the detour amount of the passage 26 can be suppressed to a small amount.

As shown in FIG. 4, the rear surface of the air cleaner case 21 has a large opening 21d, and the opening 21d is covered with a lid member 27 to close it off. The lid member 27 is attached to the case 21 by inserting and tightening screws 28 into holes 27a, one in the upper part and two in the lower part. A porous air cleaner element 29 is installed inside the case 21 so as to close the air exhaust hole formed by the cylindrical portion 21, and this element 29 purifies the air sucked in from the air intake hole 21e provided on the top surface of the case 21. The fuel is then supplied to the carburetor 24 and the engine 12. The element 29 is attached to the case 21 by screwing the wing nut 31 onto the support member 30. When replacing the element 29, or performing maintenance or inspection, the lid member 27 must be removed and the hand inserted through the opening 21d. Loosen the wing nut 31 and perform the work of attaching and detaching the element 29.

As described above, the air suction hole 21e is formed on the top surface of the air cleaner case 21, and when the case 21 is assembled to the vehicle body, the sheet 14 is installed on the top surface of the air suction hole 21e.
The sheet 14 can effectively prevent mud, dust, etc. from being sucked into the body.

In the drawings, reference numeral 32 denotes a water drain provided on the lower surface of the air cleaner case 21.

The lid member 27 that closes the rear opening 21d of the air cleaner case 21 is formed into a curved surface that is slightly curved forward as shown in FIG. 4, so that the lid member 27 also serves as a part of the rear fender. .

That is, the arc-shaped rear fender 33, which is provided so as to cover the upper surface and the outer periphery of the rear surface of the rear wheel 15, is attached to the seat rail 13 as shown in FIG.
The extension length of the front end of the rear fender 33 is up to the air cleaner 20, and the lid member 2 extends downward from the front end.
A cover member 27 is provided so as to be continuous with the rear fender 33, effectively utilizing the air cleaner 20 disposed between the rear wheel 15 and the shock absorber 19, and facing the front surface of the rear wheel 15. A part of the rear fender is made up of. A mud guard 34 for mud protection is formed to hang down from the lower end of the lid member 27, and this mud guard 34 may be formed integrally with the lid member 27 in advance, or may be formed separately and integrated in post-processing. good. The mud guard 34 prevents mud from accumulating on the upper part of the rear fork 16, and since the water drain 32 and the mud guard 34 are provided close to each other,
The liquid discharged from the drain 32 is transferred to the mud guard 3.
4 to the road surface below to prevent diffusion.

35 shown in FIGS. 1 and 2 is a side cover, and this side cover 35 includes a shock absorber 19, an air cleaner 20, a rear wheel 15, and a rear wheel 15 on both sides of the vehicle body.
The front part is provided with a hook part 3 to cover the upper part of the
By locking 5a to the seat rail 13,
At the rear, the side cover 35 is assembled to the vehicle body by screwing the bracket 35b to the seat rail 13.

When performing maintenance work on the air cleaner 20, when the stand is erected, the rear fork 16 swings and tilts to position A, as described above.
A large gap S is formed between the rear wheel 15 and the air cleaner 20. Insert your hand through this gap S, remove the cover member 27 of the air cleaner 20, and remove the air cleaner element 27 as described above.
Carry out necessary work such as replacement and maintenance. Therefore, this maintenance work can be performed without removing the side cover 35.

(Effects of the Invention) As described above, according to the air cleaner device for a motorcycle of the present invention, firstly, between the cross member of the rear fork in the vehicle width direction and the vehicle body frame, there is a space between the engine and the rear wheel in the vertical direction of the vehicle body. towards 1
The air cleaner case is placed between the individual shock absorbers and the rear wheels, and the air cleaner case and carburetor are connected through a passage that bypasses the shock absorbers, making it possible to increase the capacity of the air cleaner case. can.

A pair of subframes extending rearward are provided on the outside of the shock absorber in the vehicle width direction, and the air cleaner case is placed inside this subframe, so the subframe protects the air cleaner case from obstacles outside the vehicle body. be able to.

Furthermore, since the air cleaner case is attached so that it can swing, it is possible to avoid the problem that vibrations of the vehicle body tend to concentrate on the carburetor and cause engine malfunction, which would occur if the air cleaner case was firmly fixed. I can do it.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a side view showing the main parts of a motorcycle, FIG. 2 is a plan view showing the arrangement of main parts excluding the fuel tank and seat, and FIG. The figure is an exploded perspective view of the air cleaner.
FIG. 4 is a longitudinal sectional view of the air cleaner, and FIG. 5 is a diagram similar to FIG. 2 showing a conventional example. In the drawing, 10 is the body frame, 12 is the engine, 15 is the rear wheel, 16 is the rear fork, 16c
19 is a cross member, 19 is a shock absorber, 20 is an air cleaner, 26 is a passage, 27 is a lid member, and 33 is a rear fender.

Claims (1)

[Scope of Claims] 1. A motorcycle in which a shock absorber is installed between a vehicle body frame and a swingable rear fork that supports a rear wheel, wherein the shock absorber is connected to a cross member of the rear fork in the width direction of the vehicle body and the vehicle body frame. A pair of subframes are provided between the shock absorbers and between the engine and the rear wheels in the vertical direction of the vehicle body, and a pair of subframes extending rearward are provided outside the shock absorbers in the width direction of the vehicle body. The air cleaner case is swingably mounted inside the engine and between the shock absorber and the rear wheel, and the air cleaner case and the carburetor are connected by a passage that bypasses the shock absorber. Air cleaner device for motorcycles. 2. The air cleaner device for a motorcycle according to claim 1, wherein a mud guard that hangs downward is attached to the lower end of the rear surface of the air cleaner case.