JPH06299920A - Intake device for motorcycles - Google Patents

Abstract

(57) [Summary] [Purpose] Prevents water and dirt from entering the intake port of the air cleaner case. [Structure] A standing wall 46 integrally provided by projecting upward on the outer periphery of an intake duct 42 that opens rearward, hanging walls 48 and 49 of a bottom plate 47 of a seat, and a rear side from a side of an intake port 45. The surrounding wall 51 protruding upward from the surroundings forms a labyrinth structure in the intake passage 52 formed between the bottom plate 47 of the seat and the rear fender 29, and water and dirt entering from the front as well as from the side and the rear. It also blocks water, dirt, etc. that enter the suction port 45.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic motorcycle 2 in which water, dirt and the like are difficult to enter into an intake port of an intake duct which extends from an air cleaner case of a motorcycle and opens rearward.
The present invention relates to an intake device for a wheeled vehicle.

[0002]

In Japanese Utility Model Publication No. 63-45428, an intake duct extending rearward from a rear portion of an air cleaner case is provided so as to face an intake passage formed between a seat bottom plate and a rear fender. A rib protruding upward from the rear fender is integrally formed behind the intake port of the duct, and a maze structure is formed in the intake passage by the integrally formed rib protruding upward from the upper surface of the air cleaner case and the rib hanging from the seat bottom plate. The formed intake device of the motorcycle is shown.

[0003]

By the way, in the case of this prior art example, the maze structure formed by the ribs on the upper surface of the air cleaner case and the ribs hanging from the seat bottom plate is effective against water and dirt entering from the front. However, it is difficult to prevent the intrusion of water, dirt, and the like that wrap around from the side. Further, the rib integrally formed on the upper surface of the air cleaner case is restricted in position, shape and size when the air cleaner case is molded. Therefore, the present application aims to solve the various problems.

[0004]

In order to solve the above-mentioned problems, an intake device for a motorcycle according to the present invention is a standing member which is upwardly projected to the outer periphery of an intake duct extending rearward from a rear portion of an air cleaner case. The wall, the hanging wall projecting downward from the seat bottom plate so as to overlap with the standing wall in the front-rear direction, and the side from the side of the intake opening opened rearward of the air intake duct, surround the rear side, and rise upward integrally from the rear fender. A projecting surrounding wall is provided, and the standing wall, the hanging wall, and the surrounding wall form a passage structure in the intake passage.

[0005]

Since the rising wall that projects upward from the outer periphery of the intake duct and the hanging wall that projects downward from the seat bottom plate form a labyrinth structure in the intake passage, it tries to enter the intake port from the front. Water and dirt are effectively blocked by this maze structure.

[0006] Further, water, dust, etc., which come in from the side,
The surrounding wall that surrounds the intake port of the intake duct from the side to the rear prevents entry.

At this time, since the standing wall is not formed integrally with the upper surface of the air cleaner case as in the conventional case but is formed on the outer circumference of the intake duct, the position, shape, size, etc. are not restricted and the degree of freedom is increased. Will increase.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described with reference to FIGS. FIG. 2 is a side view of a motorcycle to which the air intake system of the embodiment is applied, and FIG. 3 is a plan view of a vehicle body skeleton portion.

In these drawings, the upper end of a front fork 2 supporting the front wheel 1 is connected to the front end of a main frame 4 via a head pipe 3. The main frame 4 extends in the front-rear direction on the center of the vehicle body, and the upper ends of a pair of left and right front pipes 5 are welded to the front portion of the main frame 4, and a pair of left and right rear pipes 6 are formed on flat portions formed on the left and right side surfaces of the rear portion. The upper end and each front end of the pair of left and right seat rails 7 are welded.

The main frame 4, the front pipe 5 and the rear pipe 6 form a cradle type frame, on which a horizontally placed engine 8 is supported. A carburetor 9 is connected to the engine 8, and the carburetor 9 is connected to the conduit 1.
It is connected to the air cleaner case 11 via 0.

The air cleaner case 11 extends obliquely upward and rearward from the lower portion of the rear pipe 6 and is connected to an intermediate portion of the seat rail 7 which extends substantially horizontally rearward, and a rear stay 12.
It is arranged in a triangular space formed by the rear pipe 6 and the seat rail 7, and both left and right side surfaces are covered with side covers 13.

A swing arm 1 is provided below the rear pipe 6.
4 has a front end portion swingably connected to the rear end portion of the rear wheel 1
5 are supported. Both ends of the rear cushion 17 are connected between the rear end of the swing arm 14 and the side surface of the reinforcing bracket 16 welded to the side surface of the seat rail 7.

Further, a substantially V-shaped step holder 19 for mounting the rear step 18 is provided in front of the rear cushion 17, one end of which is connected to the rear stay 12 and the other end of which is coaxial with the front end of the swing arm 14. Is connected to the rear pipe 6 side.

Rear cushion 1 on the upper left side of the rear wheel 15
A dress guard 20 is provided in a portion rearward of 7. The upper end of the side frame 21 of the dress guard 20 is
The tip part is the same as the bracket 22 at the rear position.
Supported by 3. The bracket 22 is attached at one end together with the upper end of the rear cushion 17, and the other end extends rearward to support the upper end of the side frame 21.

The lower end of the side frame 21 is provided with the bracket 2
It is connected to the rear end portion of the lower frame 25 via 4. The lower frame 25 extends forward across the outside of the rear cushion 17 and its tip is connected to a bracket 26 mounted on the apex of a step holder 19 supporting the rear step 18 and is apparent in FIG. As you can see, it overhangs to the side.

As shown in FIG. 2, a fuel tank 27 is supported on the main frame 4 and the seat rail 7
A sheet 28 is supported on the above. Further, as is apparent from FIG. 3, the rear half of the seat rail 7 and the rear stay 1 are
A rear fender 29 is supported on the second side.

FIG. 4 is a partially cutaway side view of the air cleaner case 11 portion where the side cover 13 is omitted, and FIG. 5 is a side cover 1 where the air cleaner case 11 is partially cut away.
It is a top view shown with 3. In addition, FIG.
FIG. 6 is an enlarged cross-sectional view of the maze structure portion of the suction passage with respect to the air cleaner case, and FIG. 6 is a view showing the suction passage portion by cutting out the side outline of the seat. Furthermore, FIG.
Is a sectional view of the main body of the air cleaner case 11 taken along the line AA in FIG. 4, and FIG. 8 is a similar sectional view taken along the line BB in FIG.

First, as is apparent from FIG. 7, the main body portion 30 of the air cleaner case 11 has an air cleaner chamber 31 whose left side is opened, a battery case 32 which is provided with its right side opened back to back, and an air cleaner chamber 31. Cleaner room 31
Also, a container 33 that is elongated in the left-right direction and is opened on the right side is integrally formed below the battery case 32.

As is apparent from FIG. 4, in the air cleaner case 11, the protrusion 34 formed on the upper front side is attached to the bracket 35 provided on the seat rail 7 with the bolt 36, and the protrusion formed on the lower rear side. The portion 37 is attached to a bracket 38 provided on the rear stay 12 with a bolt 39.

A tubular element 40 is provided in the air cleaner chamber 31, and its clean side is connected to the connecting tube 10. Also, on the dirty side,
A discharge port 43 of an air intake duct 42 inserted into the interior of the main body 30 from a connection hole 41 formed in the right shoulder communicates with each other, and a rib 44 is formed between the discharge port 43 and the element 40. As shown in FIG. 8, the rib 44 has a partition shape and is integrally formed with the main body portion 30.

As is most apparent in FIG. 1, the intake duct 4
The reference numeral 2 extends rearward from the main body portion 30 and its suction port 45 is opened rearward. An upright wall 46 projecting upward is integrally formed on the outer peripheral portion in the vicinity of the suction port 45, and hanging walls 48, 49 projecting downward from a bottom plate 47 of the seat are integrally formed on the front and rear sides thereof. The standing wall 46 overlaps the hanging walls 48 and 49 in the front-rear direction.

Further, a front rib 50 which fits around the intake port 45 of the intake duct 42 from below, and a surrounding wall 51 which surrounds the side of the intake port 45 from the rear to a rear side and which is substantially U-shaped in a plan view, are rear fenders. It is formed so as to integrally project upward from 29. As is apparent from FIG. 5 showing these plan views, the front rib 50 extends in a substantially straight line in the left-right direction, and both ends thereof are close to the left and right tip portions of the substantially U-shaped surrounding wall 51.

The standing wall 46, the hanging walls 48, 49, and the surrounding wall 51 form an intake passage 5 formed between the bottom plate 47 of the seat and the rear fender 29 and reaching the intake port 45.
A maze structure is formed within 2. That is, the front portion of the intake passage 52 and the rear portion of the fuel tank 27 and the seat 2 are
8 is surrounded by the front end portion of the seat rail 7, and the left and right sides are surrounded by a skirt portion 28a of the seat 28 that hangs down to a position where the seat rail 7 overlaps the side of the seat rail 7L as shown in FIG. It is surrounded by a substantially triangular bracket 57 attached to the joint portion of the rear stay 12 and the rear stay 12 to form a passage for intake air.

Incidentally, in FIG. 1, FIG. 4 and FIG.
In order to distinguish the right and left of the pair of seat rails 7,
R is shown on the right side and L is shown on the left side. Reference numeral 47a in FIGS. 1 and 6 is a cushion rubber that is attached to the bottom plate 47 and contacts the seat rail 7. Reference numeral 57a in FIG. 6 is a nut for bolting the mounting stay 28b of the seat 28.

As shown in FIG. 4, the air cleaner chamber 31
The lid 53 is attached to the opening of the main body 3 at the four corners.
It is fixed with the 0 side and screw 54. Further, the rear end portion of the connecting tube 10 enters the air cleaner chamber 31 through a connecting hole 55 (see FIG. 5) formed in the main body portion 30.

As shown in FIG. 5, the side covers 13 are provided in pairs on the left and right sides of the air cleaner case 11, and the upper front ends of the side covers 13 are fastened to the lower rear edge of the fuel tank 27 by one-touch with hooks 13a of elastic members. On the upper rear end, the rib 56 is attached to the locking piece 58 of the bracket 57 (see FIG. 6).
It is inserted into and engaged with, and is attached to the rear pipe 6 by a cylinder type lock portion 59 (see FIG. 4) provided in the lower front portion. The lock 59 is opened and closed by a key.

Referring again to FIG. 4, the intermediate portion of the connecting tube 10 penetrates the dust guard 60 mounted between the left and right rear pipes 6. The dust guard 60 is a rubber plate-shaped member and is arranged so as to protect the front portion of the air cleaner case 11.

As shown in FIG. 9 which is a direction of the arrow C in FIG. 4, slits 61 and 62 are formed above and below the portion overlapping the left and right rear pipes 6, and the connecting tube 10 is passed through the substantially central portion. The hole 63, a hole and a slit 64 for penetrating the cords of the electric system on the side thereof, an air vent tube hole 65 on the upper right side, and a slit 66 continuous from the lower end of the hole 63 to the lower end of the dust guard 60 are formed. This facilitates the penetration of the connecting tube 10.

The carburetor 9 is placed in the air vent tube hole 65.
The air vent tube 67 (FIG. 4) extending from (FIG. 2) penetrates, and the locking pieces 68, 69 (FIG. 10) attached to the rear pipe 6 in advance are inserted into the slits 61 and 62, respectively. 60 is attached to the rear pipe 6. 10 is a cross section taken along the line D-D in FIG. 9, and the dust guard 60 for the rear pipe 6 is shown.
The attached state of is shown.

As shown in FIGS. 2 and 3, the main parts of the vehicle body other than those described above are the front cowl 70 that covers the front upper part of the front fork 2 and the front pipe 5 that are attached to the vehicle width. Direction, a rectangular guard pipe 71, a handle 72 for rotating the front fork 2, a brake pedal 73 provided on the right side of the vehicle body (FIG. 3), and step 74 provided on both left and right sides of the vehicle body (see FIG. 3). ), An exhaust pipe 75 extending rearward from the engine 8, and a muffler 76 connected to a rear end portion (FIG. 3),
A change pedal 77 and the like provided on the left side of the vehicle body are provided. The dress guard 20 and the muffler 76 are arranged so as to be laterally separated with the vehicle body interposed therebetween (see FIG. 3).

Next, the operation of this embodiment will be described. As shown in Fig. 1, the flow of air is indicated by water, dirt, etc.
Direction) into the intake passage 52, the labyrinth structure of the hanging wall 48 and the standing wall 46 and the presence of the front rib 50 effectively prevent the entrance into the intake port 45. Also,
As shown in FIG. 5 by indicating the flow of air, the water and dust entering from the side and the water and dust entering from the rear are
The surrounding wall 51 surrounding the suction port 45, the hanging wall 4 and the standing wall 4
The maze structure of 6 effectively blocks entry as well.

Moreover, the maze structure of the surrounding wall 51 and the hanging wall 49 and the surrounding wall 51 protruding upward so as to narrow the gap between the sheet and the bottom plate 47 of the sheet also prevent the intrusion of water, dust and the like. The effect of blocking is increased.

In addition, since the standing wall 46 is integrally formed on the outer circumference of the intake duct 42, unlike the conventional case where it is integrally formed on the upper surface of the air cleaner case 11, the position, shape and size are restricted. It will disappear and the degree of freedom will increase.

Further, since the dust guard 60 is arranged in front of the air cleaner case 11, since the engine 8 is arranged horizontally, water, dirt and the like rolled up from the front wheel 1 are directly directed to the front surface of the air cleaner case 11. Even if they fly, they can be blocked by the dust guard 60 in front of the air cleaner case 11.

Further, as shown in FIG. 9, the air vent tube 67 can be supported by the dust guard 60 by passing the air vent tube 67 through the air vent tube hole 65, so that it is not necessary to support the air vent tube 67 by using a special clamp. The points can be reduced.

[0036]

According to the invention of the present application, a standing wall that projects upward from the outer periphery of the intake duct, a hanging wall that projects downward from the bottom plate of the seat, and a surrounding wall that surrounds the intake port of the intake duct from the side to the rear. Since a maze structure is formed in the intake passage, water and dirt that try to enter the inlet from the front can be effectively blocked by this maze structure, and water and dirt that wrap around from the side can also be surrounded. The wall can effectively prevent intrusion.

In addition, since the standing wall is integrally formed on the outer circumference of the intake duct, unlike the conventional case where it is integrally formed on the upper surface of the air cleaner case, the position, shape, size, etc. are associated with the molding of the air cleaner case. You will not be constrained and you will have more freedom.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view showing an outline of a main part of an embodiment.

FIG. 2 is a side view of a motorcycle to which the intake device of the embodiment is applied.

FIG. 3 is a plan view of a vehicle body skeleton portion of the embodiment.

FIG. 4 is a side view in which an air cleaner case portion according to the embodiment is partially cut away and a side cover is omitted.

FIG. 5 is a plan view showing a part of the air cleaner case portion in a cutaway view in the embodiment.

FIG. 6 is an enlarged side view of the essential part of the embodiment.

7 is a cross-sectional view of the main body of the air cleaner case taken along the line AA in FIG.

FIG. 8 is a similar cross-sectional view taken along the line BB of FIG.

9 is a plan view of the dust guard in the direction of arrow C in FIG.

10 is a cross-sectional view taken along the line DD of FIG.

[Explanation of symbols]

4: Main frame, 6: Rear pipe, 7: Seat rail, 11: Air cleaner case, 12: Rear stay, 1
3: side cover, 28: seat, 29: rear fender, 42: intake duct, 45: intake port, 46: standing wall,
47: bottom plate of seat, 48: hanging wall, 49: hanging wall, 5
0: Front rib, 51: Surrounding wall, 60: Dust guard

Claims (1)

[Claims] 1. An intake system for a motorcycle, wherein an intake duct extending rearward from a rear portion of an air cleaner case is arranged in an intake passage formed between a seat bottom plate and a rear fender, and an upper part is provided above an outer periphery of the intake duct. To the rear fender surrounding the rear side of the intake opening opened rearward of the intake duct, and the hanging wall protruding downward from the seat bottom plate so as to overlap in the front-back direction of the standing wall. An intake device for a motorcycle, characterized in that a surrounding wall that is integrally projected upward from the above is provided, and a maze structure is formed inside the intake passage by the standing wall, the hanging wall, and the surrounding wall.