JPH07119567A - Manufacture of air cleaner case - Google Patents

Abstract

PURPOSE:To easily and inexpensively manufacture an air cleaner case in comparison with an injection molding by integrally blow molding two case half bodies, which are respectively provided with cap parts closing respective intake outlet ports, and a connecting part, which connects respective opening parts together, and then, cutting off each of these parts individually. CONSTITUTION:An air cleaner case is provided with two case half bodies 2, 3, which are respectively provided with opening parts 21, 31 to be connected to both side faces of an air cleaner element individually and cylindrical intake outlet ports 22, 32, and separately form a clean chamber and a dirty chamber respectively. In this case, for manufacturing an air cleaner case, firstly, the two case half bodies 2, 3, which are respectively provided with cap parts 22', 32' respectively closing each of the intake outlet ports 22, 33, and a connecting part, 1', which connects respective opening parts 21, 31 together, are integrally blow molded. Secondly, respective cap parts 22', 32' and the connecting part 1' are respectively cut off from the two case half bodies 2, 3. In this way, manufacture can be carried out more easily and more inexpensively than injection molding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an air cleaner case that houses an air cleaner element inside.

[0002]

2. Description of the Related Art Generally, an air cleaner case of a motorcycle is provided with a pair of case halves which are joined by sandwiching an air cleaner element. Conventionally, the case halves have been manufactured by injection molding. A blow molding of an integrated air cleaner case for a saddle-ride type vehicle is also known as the actual opening 6
It is known from Japanese Patent Publication No. 4-47974.

[0003]

By the way, since the case half of the air cleaner case is provided with an intake air inlet and an air intake outlet, if the case half is to be manufactured by injection molding, the mold of the mold will be used. There is a problem that the cost becomes more complicated and the cost increases.

The present invention has been made in view of the above circumstances, and an object thereof is to manufacture an air cleaner case by blow molding at low cost.

[0005]

In order to achieve the above object, the present invention is directed to a first aspect of the present invention that defines a clean chamber including an opening coupled to one side surface of an air cleaner element and a cylindrical intake air outlet. A method of manufacturing an air cleaner case for manufacturing a case half and a second case half having an opening coupled to the other side surface of the air cleaner element and a cylindrical intake air inlet to define a dirty chamber. A first case half body integrally having a cap portion closing the intake air outlet, a second case half body integrally having a cap portion closing the intake air inlet, and the opening portions are connected to each other. After blow molding integrally with the connecting part,
It is characterized in that both the cap portions and the connecting portion are cut off from the both case halves.

[0006]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 12 show an embodiment of the present invention. FIG. 1 is an overall side view of a motorcycle, and FIG.
3 is a sectional view taken along line 3-3 of FIG. 1, FIG. 4 is a sectional view taken along line 4-3 of FIG. 3, FIG. 5 is a sectional view taken along line 5-5 of FIG. 3, and FIG. Fig. 6 is a sectional view taken along line 6-6, Fig. 7 is an exploded view of the air cleaner, Fig. 8 is an enlarged view in the direction of 8 of Fig. 1, and Fig. 9 is 9- of Fig. 8.
9 is a sectional view taken along line 9-10, and FIG. 10 is a sectional view taken along line 10-10 of FIG.
FIG. 1 is a view showing a molding die for the first case half body, and FIG. 12 is an explanatory view of a manufacturing process of the air cleaner case.

As shown in FIGS. 1 and 2, the motorcycle V
Is provided with a body frame F that constitutes a skeleton. A steering handle H is provided at the upper end of a front fork Ff operably supported at the front end of the body frame F, and a front wheel Wf is pivotally supported at the lower end. To be done. At the rear end of a rear fork Fr, which is pivotally supported on the rear portion of the body frame F so as to be vertically swingable and suspended by a rear cushion Cr, is driven by a V-type 2-cylinder water-cooled engine E mounted in the center portion of the body frame F. The rear wheel Wr is pivotally supported.

A fuel tank T and a seat S are arranged at the front and rear of the vehicle body. A radiator R is provided at the front of the engine E, an air cleaner A is provided at the right side, and a pair of carburetors C and an intake chamber are provided at the top. Ch is provided for each. An exhaust pipe P extending from the engine E to the rear of the vehicle body is connected to a muffler M arranged on the right side surface of the vehicle body.

Next, the structure of the air cleaner A will be described in detail with reference to FIGS.

The air cleaner A is arranged along the lower edge of the fuel tank T on the right side surface of the motorcycle V. The air cleaner element 1 is formed in a rectangular plate shape.
And the first to sandwich the air cleaner element 1 from the left and right
An air cleaner case 4 including a case half body 2 and a second case half body 3, and an air cleaner cover 5 that covers the outside of the air cleaner case 5.

The air cleaner element 1 has a filter medium 6 inside.
Is provided with a rectangular frame body 7 for holding a pair of ring-shaped seal members 8 and 9 supported on the outer periphery of the frame body 7, and the upper half and the lower half of the seal member are linear. A pair of seal members 10 and 11 that are formed are supported. The central portion of the upper and lower sides of the frame body 7 has a pair of protrusions 7 _1, 7 ₁ formed to protrude toward the first case half 2, a central portion of the projection 7 _1, 7 ₁ Slit-shaped locked holes 7 ₂ , 7
₂ is formed.

The first case half 2 has an opening 2 ₁ into which the sealing member 8 supported by the frame 7 of the air cleaner element 1 fits. The front and rear portions of the opposite side wall of the opening 2 _1, the intake chamber and the intake outlet 2 ₂ circular cross section of the intake duct 12 is connected leading to Ch, circular cross-section of the drain pipe fittings 2 ₃ connecting to drainpipe And are formed. Further, the first case half body 2 has three mounting brackets 2 ₄ , 2 ₅ , 2 ₆ projecting in a plate shape, and the locked holes 7 formed in the convex portions 7 ₁ , 7 ₁ of the frame body 7. A pair of locking protrusions 2 ₇ , 2 ₇ engageable with ₂ , 7 ₂ are provided in a protruding manner.

On the other hand, the second case half 3 has an opening 3 ₁ into which the seal member 9 supported by the frame 7 of the air cleaner element 1 fits. An intake inlet 3 ₂ having a circular cross section is formed in the rear part of the second case half 3 and protrudes like a plate at a position facing the mounting brackets 2 ₄ , ₂₅ of the first case half 2. Two mounting brackets 3 ₃ and 3 ₄ are projected. Further, the front and rear portions of the opposite side wall of the opening 3 _1, to mount the air cleaner cover 5, a pair of rubber bushings 29, 29 embedded nut 28 is attached.

The opening 2 ₁ of the first case half 2 and the opening 3 ₃ of the second case half 3 are fitted into the pair of seal members 8 and 9 of the air cleaner element 1, respectively.
The air cleaner case 4 is assembled by stacking the mounting brackets 2 ₄ and 2 ₅ of the first case half body 2 and the mounting brackets 3 ₃ and 3 _{4 of} the second case half body 3 and connecting them with bolts 13 and 14. . At this time, the two locking projections 2 ₇ and 2 ₇ provided on the first case half 2 are the two engaged holes 7 ₂ and 7 provided on the frame body 7 of the air cleaner element 1.
_The air cleaner element 1 is firmly supported by engaging with the air cleaner element ₂ .

When the air cleaner case 4 is assembled in this way, a dirty chamber 15 is formed between the second case half body 3 and the air cleaner element 1 and communicates with the intake air inlet 3 _2. Half 2
Between the intake air outlet 2 and the air cleaner element 1
_The clean chamber 16 connected to ₂ is defined (see FIG. 5).

First case half 2 of air cleaner case 4
The air cleaner support stay 17 is fixed to the two mounting brackets 2 ₅ and 2 ₆ by two bolts 18 and 19.
The air cleaner support stay 17 includes two leg portions 17 ₁ and 17 ₁ .
_The air cleaner A is supported by the engine E through the legs 17 ₁ and 17 ₂ . The intake chamber support stay 20, which is fastened to the mounting bracket ₂₅ together with the bolt 18, supports the intake chamber Ch which is connected to the downstream side of the intake duct 12.

On the two rubber bushes 29, 29 provided on the second case half body 3, the air cleaner cover 5 for covering the outer side surface of the air cleaner case 4 has two bolts 21, 22.
Fixed by. Further, the leg portion 17 ₃ of the air cleaner supporting stay 17, the rear cover 23 to be fitted to the rear of the air cleaner cover 5 is secured by bolts 24.

When the air cleaner cover 5 is attached to the air cleaner case 4, as shown in FIGS. 3 to 5, the pair of seal members 10, 11 attached to the upper and lower sides of the frame body 7 of the air cleaner element 1. By closely adhering to the upper and lower inner walls of the air cleaner cover, a substantially U-shaped intake inlet 25 facing the inside of the vehicle body is formed between the front inner wall of the air cleaner cover 5 and the front outer wall of the air cleaner case 4. In addition, the pair of seal members 10, 11
At an outer side position of the vehicle body, an intake passage 26 is defined between the inner wall of the central portion of the air cleaner cover 5 and the rear outer wall of the second case half 3 of the air cleaner case 4 and is connected to the downstream side of the intake inlet 25. It Further, by the inner wall of the rear inner wall and the rear cover 23 of the air cleaner cover 5, air inlet 3 ₂ opens the intake reservoir 27 provided on the second case half 3 of the air cleaner 4 is defined.

According to the air cleaner A constructed as described above, the outside air sucked by the intake negative pressure of the engine E is formed between the front inner wall of the air cleaner cover 5 and the front outer wall of the air cleaner case 4. After being sucked from the substantially U-shaped intake air inlet 25, the air cleaner cover 5 flows rearward through an intake passage 26 formed between the inner wall of the central portion of the air cleaner cover 5 and the rear outer wall of the second case half body 3, and the air cleaner cover 5 flows into an intake chamber 27 formed between the rear inner wall of the rear cover 5 and the inner wall of the rear cover 23. The air whose flow direction is changed from the rear to the front in the intake pool chamber 27 is
It flows from the intake inlet 3 ₂ provided on the case half 3 into the dirty chamber 15, the air cleaner element 1 from there
The dust is removed across the filter medium 6. Then, clean air which has passed through the air cleaner element 1, intake duct 1 through intake outlet 2 ₂ from the clean chamber 16
2 is sent.

Since the intake port 25 for introducing the outside air into the air cleaner A is open toward the inside of the vehicle body, it is possible to effectively prevent the inconvenience that water or mud splashes are sucked into the air cleaner A. Moreover, the intake inlet 25, the dust intake passage 26, an air flow path consisting of reservoir chamber 27 and the intake air inlet 3 ₂ inspiration included in order to be formed into a labyrinth shape, reduces the flow velocity of the air passing therethrough Drop the
Only relatively clean air can be supplied to the inside of the air cleaner case 4. In particular, since the air flow in the intake chamber 27 changes from the rear to the front,
Dust contained in the air can be effectively removed at that portion.

Since the intake passage 26 can be formed with a simple structure in which the outside of the air cleaner case 4 is covered with the air cleaner cover 5, the intake device can be made compact and the number of parts can be reduced at the same time. be able to. Moreover, since the air cleaner case 4 is covered with the air cleaner cover 5, the air cleaner case 4 cannot be seen directly and the appearance is improved.

Next, the structure of the intake chamber Ch will be described in detail with reference to FIGS.

The intake chamber Ch is fitted into a recess formed in the lower surface of the fuel tank T, and the front bank 3 of the engine E is fitted.
1 and the rear bank 32 are arranged so as to be located above the carburetors C. Intake chamber C
The h has a structure in which a lower carburetor base 33 and an upper intake chamber main body 34 are coupled to each other, and bolts 35, 35 are provided at the upper ends of the intake chamber support stays 20, 20.
Fixed by. A recess 34 ₁ extending in the front-rear direction of the vehicle body is formed on the upper surface of the intake chamber main body 34. By storing the main pipe 36 of the vehicle body frame F in this recess 34 ₁ , while avoiding interference with the main pipe 36. The intake chamber Ch has a sufficient volume.

The upper end of the intake duct 12 rising upward from the air cleaner A is connected to the front surface of the intake chamber body 34, and the upper surface of the carburetor base 33 is connected to the intake passage 37 of the carburetor C on the front bank 31 side. Air intake funnel 38 and carburetor C on the rear bank 32 side
And a second intake funnel 40 connected to the intake passage 39.

As best shown in FIG. 10, the intake chamber Ch is provided with a pair of left and right first volume 41 and second volume 42 sandwiching the recess 34 ₁ of the intake chamber main body 34. By intersecting the funnel 38 and the second intake funnel 40 in an X shape in a side view and a front view, the upper end opening of the first intake funnel 38 is opposed to the first volume 41, and the second volume 42 is formed. The upper end opening of the second intake funnel 40 faces each other.
As a result, the length of each intake funnel 38, 40 can be sufficiently secured, and a sufficient clearance can be secured with the inner surface of the intake chamber main body 34.

Thus, due to the intake resonance action of the intake chamber Ch interposed between the air cleaner A and the carburetor C, the intake noise of the engine E is reduced and the air-fuel ratio fluctuation in the engine E in a specific rotation speed region is reduced. Prevention is achieved.

Next, a method of manufacturing the air cleaner case 4 will be described in detail with reference to FIGS. 11 and 12.

FIG. 11 shows a molding die D for simultaneously blow molding the first case half body 2 and the second case half body 3 of the air cleaner case 4. Mold D is upper mold 5
1 and the lower mold 52, and a molding surface 53 is formed on the inner surface thereof. Then, by rotating the molding die D while supplying high-pressure air to the inside of the synthetic resin parison housed in the molding die D, the parison is molded on the molding surface 5
3 to the first case half 2 and the second case half 3
Can be blow molded at the same time.

As shown in FIG. 12, the blow-molded first case half ₂ has a bag-shaped cap 2 ₂ ′ connected to the intake outlet 2 ₂ and a bag-shaped cap connected to the drain pipe joint 2 _3. The part 2 ₃ ′ is integrally molded, and the second part
The case half 3 is integrally formed with a bag-shaped cap portion 3 ₂ ′ connected to the intake air inlet 3 ₂ . Furthermore, the opening of the first case half 2 2 ₁ and between the opening 3 ₁ of the second case half 3, a cylindrical connecting portion 1 ₁ is molded in one piece. Therefore, after releasing, the cap portions 2 ₂ ′, 2 ₃ ′, 3 ₂ ′ are cut off from the first case half body 2 and the second case half body 3, and the connecting portions are opened from both opening portions 2 ₁ , 3 _1. The first case half body 2 and the second case half body 3 are completed by cutting 1 '. At this time, each mounting bracket 2 ₄ , 2 ₅ ,
The bolt holes 2 ₆ , 3 ₃ and 3 ₄ are formed by removing the hollow convex portion a (see FIG. 11) integrally formed on the mounting bracket during blow molding after the mold is released.

As described above, the first of the air cleaner case 4 is
Compared with the conventional injection molding, the case half 2 and the second case half 3 are blow-molded at the same time and unnecessary cap portions 2 ₂ ′, 2 ₃ ′, 3 ₂ ′ and the connecting portion 1 ′ are cut off. Equipment costs such as molds can be significantly reduced, contributing to cost reduction.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various design changes can be made.

For example, although a motorcycle is illustrated in the embodiment, the present invention can be applied to a straddle-type vehicle such as a motorcycle or a four-wheel buggy.

[0034]

As described above, according to the present invention, the first case half and the second case half having the cap portion integrally, and the connecting portion connecting the openings of both case halves to each other. Since the first case half body and the second case half body are manufactured by integrally blow molding the mold and then cutting off the cap portion and the connection portion, a metal structure having a simpler structure than that of the conventional injection molding die is manufactured. The air cleaner case can be manufactured at low cost by using the mold.

[Brief description of drawings]

[Fig. 1] Overall side view of a motorcycle

FIG. 2 is a two-direction arrow view of FIG.

3 is an enlarged sectional view taken along line 3-3 of FIG.

FIG. 4 is a four-direction arrow view of FIG.

5 is a sectional view taken along line 5-5 of FIG.

6 is a sectional view taken along line 6-6 of FIG.

[Fig. 7] Exploded view of the air cleaner

FIG. 8 is an enlarged view in the direction of arrow 8 in FIG.

9 is a view taken along the line 9-9 of FIG.

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

FIG. 11 is a view showing a molding die for the first case half body.

FIG. 12 is an explanatory view of the manufacturing process of the air cleaner case.

[EXPLANATION OF SYMBOLS] 1 air cleaner element 1 'connection unit 2 the first case half 2 ₁ opening 2 _two intake outlet 2 _2' cap 3 second case half 3 ₁ opening 3 ₂ intake inlet 3 ₂ ' Cap 15 Dirty chamber 16 Clean chamber

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display area // B29L 22:00 31:00

Claims (1)

[Claims] 1. An opening (2 ₁ ) connected to one side surface of an air cleaner element ( ₁ ) and a cylindrical intake air outlet (2).
₁ ) with ₂ ) to define a clean chamber (16)
A first half defining a dirty chamber (15) including a case half (2), an opening (3 ₁ ) coupled to the other side surface of the air cleaner element (1) and a cylindrical intake air inlet (3 ₂ ). A method of manufacturing an air cleaner case for manufacturing two case halves (3), comprising: a first case halves (which integrally includes a cap portion (2 ₂ ′) for closing the intake air outlet (2 ₂ ). 2) and a cap portion (3 ₂ ′) that closes the intake air inlet (3 ₂ ).
After integrally blow-molding a second case half body (3) integrally having the above and a connecting portion (1 ′) for connecting the both opening portions (2 ₁ , 3 ₁ ), the both case half bodies A method for manufacturing an air cleaner case, characterized in that the cap portions (2 ₂ ′, 3 ₂ ′) and the connecting portion (1 ′) are cut off from (2, 3).