JP3308339B2 - Motorcycle air cleaner device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air cleaner for a motorcycle which can advantageously support an open end of an air vent tube extending from a carburetor.

[0002]

2. Description of the Related Art Japanese Utility Model Laid-Open No. 57-157775 discloses that
In this figure, a locking portion is provided integrally with the air cleaner case, and an intermediate portion such as a pipe is engaged with the locking portion. Japanese Patent Application Laid-Open No. 4-159647 discloses a method in which a rear end of an air vent tube extending from a vaporizer is guided by a hose guide formed integrally with an air cleaner case.

[0003]

However, a structure that can effectively prevent the open end of the air vent tube from invading surrounding water and dust is desired. The present application is intended to fulfill this need.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, an air cleaner device for a motorcycle according to the present invention includes an insertion hole for inserting and fixing an open end of an air vent tube, and an air vent tube in the insertion hole. And a boss provided with a rib for supporting the air gap from the inner wall surface of the hole with a gap, and integrally provided with the air cleaner case,
The air passage in the insertion hole formed by using the gap has a maze structure.

[0005]

An embodiment will be described with reference to FIGS. FIG. 5 is a side view of a motorcycle to which the intake device of the embodiment is applied, and FIG. 6 is a plan view of a body frame portion of the motorcycle.

In these figures, an upper end of a front fork 2 supporting a front wheel 1 is connected to a front end of a main frame 4 via a head pipe 3. The main frame 4 extends in the front-rear direction above the center of the vehicle body, and upper ends of a pair of left and right front pipes 5 are welded to the front part thereof, and a pair of left and right rear pipes 6 are formed to flat parts formed on the left and right side surfaces of the rear part. The upper end and the front ends 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 horizontal engine 8 is supported. A carburetor 10 is connected to the engine 8 via an intake manifold 9. The carburetor 10 is connected to an air cleaner case 12 via a con tube 11.

The air cleaner case 12 includes a rear stay 1.
3 formed by the rear pipe 6 and the seat rail 7
It is placed in a rectangular space, and the left and right sides are side covers 1
4 is covered. The rear stay 13 extends obliquely upward and rearward from a lower portion of the rear pipe 6 and is connected to an intermediate portion of the seat rail 7 extending substantially horizontally rearward.

As shown in FIG. 8, the side covers 14 are provided on the left and right sides of the air cleaner case 12 in a pair, and the front ends of the fuel tanks are supported on the main frame 4 by elastic member hooks 15 at the upper front ends. 16 is fixed to the rear lower edge by one-touch, and the upper end of the rear end is engaged with an integral rib 14a to the locking piece 17, and the lower part is a lock 14b.
Key is locked (FIG. 7). The locking piece 17 is attached to a bracket 18 of the vehicle body.

As is apparent from FIG. 5, a fuel cock 19 is provided at a position extending from the lower part of the fuel tank 16 above the carburetor 10, and a storage case 20 is provided in front of the fuel cock 19. ing. The storage case 20 is suspended and supported by attaching an upper protruding portion 21 provided on an upper portion thereof to a stay 22 protruding downward from the main frame 4.

FIG. 7 is a view showing a detail of the air cleaner case 12 with a part of the side face cut away, together with the body frame portion. FIG. As is apparent from FIG. 7, the air cleaner case 12 has
A cylindrical element 25 is housed in the inside, a suction duct 26 communicates with the rear of the dirty side, and a con tube 11 communicates with the clean side from the front.

A protruding portion 27 is formed at an upper portion of a front end of the air cleaner case 12, and a through hole 27a provided therein is formed.
(FIG. 1), the seat rail 7 is
Is attached to a bracket 29 having its upper end fixed. The open end of the air vent tube 30 is supported by the protrusion 27 below the bolt 28 by a boss described below. The other end of the air vent tube 30 is connected to the vaporizer 10.
(See FIG. 5).

A projection 31 is also formed at the lower rear end of the air cleaner case 12 and is attached to a bracket 32 provided on the rear stay 13 with a bolt 33.

FIG. 1 shows a boss 34 formed integrally with the protruding portion 27, FIG. 2 is a sectional view of the boss 34 in a state where the air vent tube 30 is supported, and FIG. 3 is a line AA in FIG. 2 in this state. FIG. 4 is a sectional view along the line BB.

As is apparent from these figures, the inner diameter of the insertion hole 35 formed in the axial direction of the boss 34 is formed to be larger than the outer diameter of the air vent tube 30 and is inserted into the insertion hole 35 in the circumferential direction. There are formed four ribs 36 provided at intervals of 90 ° and each extending in the axial direction. As shown in FIG. 3, the outer diameter of the circular space connecting the tips of the ribs 36 is formed to be approximately the same as or slightly smaller than the outer diameter of the air vent tube 30, and the air vent tube 30 pushed into this space is formed.
Can be reliably supported to such an extent that it does not easily come off.

Each rib 36 is located at the back of the insertion hole 35.
A step portion 37 is formed in the axial direction to protrude to the inner diameter of the air vent tube 30 in the axial direction. Therefore, as shown in FIG. 2 and FIG. 4, the open end 30a of the air vent tube 30 comes into contact with the
5 does not adhere to the bottom. Therefore, as is apparent from FIG. 2, a gap is formed by the rib 36 around the air vent tube 30 and between the tip and the inner wall surface 35a. This gap forms an air passage having a maze structure reaching the open end 30a of the air vent tube 30.

Next, the structure of the intake passage near the intake duct 26 will be described. As shown in FIG. 7, a rib 41 is formed between the discharge port 40 of the intake duct 26 and the element 25. The rib 41 forms a screen and is formed integrally with the air cleaner case 12.

The intake duct 26 extends rearward, and its intake port 42 opens rearward. An upstanding wall 43 protruding upward is integrally formed on an outer peripheral portion in the vicinity of the suction port 42, and hanging walls 46 and 47 protruding downward from a bottom plate 45 of the sheet 44 are integrally formed before and after the rising wall 43. The walls 46 and 47 respectively overlap in the front-rear direction.

Further, a front rib 48 which fits around the intake port 42 of the intake duct 26 from below, and a surrounding wall 49 which surrounds the rear side from the side of the intake port 42 and has a substantially U-shape in plan view is provided with a rear fender. The projection 50 is integrally formed to protrude upward from 50. As is apparent from FIG. 8 showing these plane views, the front rib 48 extends substantially linearly in the left-right direction, and both ends thereof are close to the left and right end portions of the substantially U-shaped surrounding wall 49.

The upright wall 43, the hanging walls 46, 47 and the surrounding wall 49 form a maze structure between the bottom plate 45 of the seat 44 and the rear fender 50 to form the inside of the intake passage 51 reaching the intake port 42. ing.

That is, the intake passage 51 has a front portion surrounded by a rear portion of the fuel tank 16 and a front end portion of the seat 44.
The left and right sides are surrounded by a skirt portion 52 of the seat 44 which hangs down to a position overlapping the side of the seat rail 7 and, further inside, is attached to a joint between the seat rail 7 and the rear stay 13 as shown in FIG. The bracket is surrounded by a substantially triangular bracket 53 and forms a passage for intake air.
FIG. 9 is a view in which the side of the seat 44 is cut away and the inside is shown from the left side of the vehicle body, and reference numeral 54 in the figure denotes a nut for bolting a mounting stay 55 for the seat 44. Reference numeral 56 denotes a cushion rubber attached to the bottom plate 45 of the seat 44 and abutting on the seat rail 7.

Referring again to FIG. 7, an intermediate portion of the con tube 11 passes through a dust guard 60 attached between the left and right rear pipes 6. The dust guard 60 is a rubber plate-shaped member, and is provided to protect a front portion of the air cleaner case 12.

As shown in FIG. 10, which is a view in the direction of arrow C in FIG. 7, slits 61 and 62 are formed in the upper and lower portions overlapping the left and right rear pipes 6, and a substantially central portion for passing the con tube 11 through. A hole 63, a hole and a slit 64 for penetrating the cords of the electric system on the side thereof, and an air vent tube hole 65 provided 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 to facilitate the penetration of the con tube 11.

The air vent tube hole 65 has a vaporizer 10
An air vent tube 30 extending from FIG.
5, 8) penetrate, and locking pieces 68, 69 previously attached to the rear pipe 6 in the respective slits 61 and 62.
(FIG. 11), the dust guard 60 is inserted.
Is attached to the rear pipe 6. Note that FIG.
5 is a cross-sectional view taken along line DD of FIG. 5, and shows a state where the dust guard 60 is attached to the rear pipe 6.

FIG. 12 is an enlarged view of the side shape of the container 20, and FIG. 13 is a sectional view taken along line EE. As is apparent from these figures, the container 20 has a hollow main body 70 opened on the right side, and the right side chamber 71.
Is longer in the front-rear direction, and the left chamber 72 is formed in a state in which a length corresponding to a substantially rear half of the right chamber 71 is cut, and is shorter than the right chamber 71. The left side of the left chamber 72 is a closed side wall 73.

The outside opening of the right side chamber 71 is a lid 74.
Covered with. The lid 74 is detachably fixed to a boss 75 protruding toward the opening at the rear of the right chamber 71 with a bolt 76.

A decorative lid 77 having a front end aligned with the side wall 73 and extending longer than the side wall 73 is attached to the outside of the left chamber 72 by a tapping screw 78.

The space behind the left side chamber 72 and surrounded by the decorative lid 77 and the rear part of the right side chamber 71 forms an engine functional component installation space 79.
At least a part of the engine functional components including the intake manifold 9 and the carburetor 10 is housed in the inside 9. The rear end of the decorative lid 77 covers the front portion of the vaporizer 10 to the extent that the vaporizer 10 can be adjusted from the left side of the vehicle body.

As shown in FIG. 5 and FIG. 6, a front cowl 80 covering the upper front of the front fork 2 is a main part of the entire vehicle body other than the above description.
A handle 81 for rotating the front fork 2,
A rectangular guard pipe 82 attached to the front pipe 5 and extending in the vehicle width direction, an exhaust pipe 83 extending rearward from the engine 8, and a brake pedal 84 provided on the right side of the vehicle body
(FIG. 6), a change pedal 85 on the left side of the vehicle body, steps 86 and 88 (FIG. 6) provided on both right and left sides of the vehicle body, a swing arm 87 that can swing up and down, a rear cushion 89, a dress guard 90, and exhaust. A muffler 92 (FIG. 6) connected to the rear end of the tube 83 is provided.

Next, the operation of this embodiment will be described. 1 to 4, the open end 30a of the air vent tube 30 is shown.
When the side is pushed into the insertion hole 35 of the boss 34, the air vent tube 30 is pressed against the surroundings by the rib 36, and is held so that it does not easily fall off.

Further, as shown in FIG.
The air passage reaching the open end 30 a forms a maze structure in the insertion hole 35. Therefore, even if water, dust, or the like attempts to enter the air vent tube 30, the maze structure prevents the entry, and it is difficult to enter the open end 30a. In addition, since the boss 34 is formed integrally with the air cleaner case 12, a special clamp or the like can be eliminated, and the number of parts can be reduced. In addition, since the open end 30a of the air vent tube 30 can be cut straight instead of the conventional oblique cut, the production is advantageous without the need for labor.

Further, since the intermediate portion of the air vent tube 30 is supported by penetrating the dust guard 60 provided to protect the front portion of the air cleaner case 12, the intermediate portion of the air vent tube 30 is supported. This eliminates the need for a separate member, such as a clamp, for performing the operation, which is more advantageous.

Further, as shown in FIG.
Storage compartment 2 of which the left and right lengths are shorter than the right chamber 71
0, and a space formed inside the decoration lid 77 and the right side chamber 71 is provided as an engine functional component installation space 79 by attaching a decoration lid 77 extending rearward longer than the side wall 73 to the left side chamber 72. Available, and the appearance of these engine functional parts can be minimized,
The appearance is improved.

[0034]

According to the invention of the present application, a boss is provided integrally with an air cleaner, an insertion hole for inserting the open end of the air vent tube is formed in the boss, and the air vent tube is supported with a gap between the hole inner wall surface. The air passage formed in the insertion hole is formed into a maze structure using the gap. therefore,
Water and dust can be prevented from entering the open end of the air vent tube.

In addition, since the open end can be cut straight instead of the conventional diagonal cut, no labor is required and the production becomes advantageous. Further, since the boss is formed integrally with the air cleaner case, a separate member such as a clamp can be eliminated, and the cost can be reduced. In addition, since there is no restriction on the clamp position and the like, the position of the open end can be set relatively freely as long as the position is near the air cleaner case.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing an embodiment.

FIG. 2 is an enlarged sectional view of a main part of the embodiment.

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

FIG. 4 is a sectional view of the boss along the line BB in FIG. 2;

FIG. 5 is an overall side view of a motorcycle to which the embodiment is applied.

FIG. 6 is a plan view of a skeleton portion of the entire motorcycle to which the embodiment is applied.

FIG. 7 is a side view of a main part of the vehicle body, showing a state in which the air cleaner according to the embodiment is attached, with a part cut away.

FIG. 8 is a plan view of a main part of the same.

FIG. 9 is a side view of a main part of a vehicle body with a partially cut-away view showing an intake duct portion of the embodiment in an enlarged manner.

FIG. 10 shows a dust guard used for the vehicle body of the embodiment.
From the direction of arrow C

11 is a sectional view taken along line DD of FIG.

FIG. 12 is an enlarged cross-sectional view of a case provided in the vehicle body of the embodiment.

FIG. 13 is a sectional view taken along line EE of FIG. 12;

[Explanation of symbols]

4: Main frame, 12: Air cleaner case, 1
4: side cover, 30: air vent tube, 30
a: open end, 34: boss, 35: insertion hole, 35a:
Hole inside wall, 36: rib, 37: step

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-159447 (JP, A) JP-A-4-52549 (JP, U) JP-A-59-152267 (JP, U) JP-A-58 136680 (JP, U) Japanese Utility Model Showa 57-28152 (JP, U) Japanese Utility Model Showa 57-157757 (JP, U) Japanese Utility Model Showa 52-49222 (JP, U) (58) Field surveyed (Int. ⁷ , DB name) F02M 35/024 F02M 35/08-35/10 F02M 35/16 F02M 5/08 F02M 13/00 F02P 7/04 B62J 37/00-39/00

Claims (1)

(57) [Claims] 1. A boss having an insertion hole for inserting and fixing an open end of an air vent tube and a rib for supporting the air vent tube from an inner wall surface of the hole with a gap in the insertion hole, and a boss integrally formed with the air cleaner case. And an air passage in the insertion hole formed by using the gap has a maze structure.