JPS6236714Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an air cleaner case for a motorcycle.

In a motorcycle, an air cleaner element (filter material) for purifying air supplied to a carburetor or the like is usually housed in a case (air cleaner case) made of synthetic resin or the like and attached to the vehicle body.

The air cleaner case needs to have an appropriate volume on the suction side (primary side) and discharge side (secondary side) of the element housed inside, in order to reduce suction resistance. Since the external shape is limited by the mounting space that can be secured, it is essential to devise a structure that makes effective use of the limited mounting space during manufacturing. In addition, when setting up such a structure, in addition to simplifying the structure to improve productivity, consideration must also be given to vibration isolation to prevent chatter vibrations caused by engine vibrations, etc. be done.

This idea was proposed against the above background; it can be used in a relatively small dedicated space, has a simple structure, and has high rigidity, so it does not cause chatter vibrations caused by engine vibrations, etc. Another object of the present invention is to provide an air cleaner case for a motorcycle that can effectively utilize the space below the fuel tank, which has conventionally been a dead space, and can uniformly utilize the entire surface of the horizontally arranged air cleaner element. do.

Hereinafter, the present invention will be explained based on an embodiment shown in FIGS. 1 to 5.

Figure 1 shows a motorcycle to which the present invention is applied, seen from the side, where 1 is the body frame, 2 is the handlebar, 3 is the front fork that supports the front wheel 4, and 5 is the front fork that supports the front wheel 4.
1 is a fuel tank, 6 is a seat, 7 is a rear fork that supports the rear wheel 8 and is provided with a drive shaft inside, 9 is a side cover, 10 is a V-type four-cylinder engine, and 11 is a V of the V-type engine 10. A carburetor arranged in the bank part, 12 a radiator, 13 the carburetor 11 and the fuel tank 5
This is an air cleaner unit placed between the

The vehicle body frame 1 is constructed by joining a pair of left and right tank frames 1b, 1b extending downwardly toward the seat 6 to the upper end of a head pipe 1a that rotatably supports a steering stem. A pair of left and right lower frames 1 extend rearward from the lower end of the head pipe 1a.
c, 1c are joined, and these lower frames 1c,
Down tube 1 supporting engine 10 on 1c
d is joined to the tank frame 1b,
The fuel tank 5 disposed on the vehicle body frame 1b is attached to the vehicle body frame 1 via mounting portions 5a and 5b formed on the front and rear sides thereof.
is attached to.

As shown in FIGS. 2 and 3, the fuel tank 5 is formed in a saddle shape spanning tank frames 1b, 1b and lower frames 1c, 1c, and has a fuel inlet 5c formed at the center of the upper part. A cap 5d is provided, and a discharge pot (not shown) is provided at the rear of the bottom. In addition, this fuel tank 5 has a protrusion 5f that protrudes between the left and right tank frames 1b, 1b formed on the bottom plate 5e that straddles the pair of left and right tank frames 1b, 1b to increase the capacity. The inner bottom surface 5g of the protrusion 5f is inclined downward from the front end to the rear end.

As shown in FIGS. 2 and 3, the air cleaner unit 13 includes an air cleaner element (hereinafter abbreviated as element) 14 for purifying the air supplied to the carburetor 11, and this element 14.
An air cleaner case 15 is arranged below the fuel tank 5 and between the pair of left and right tank frames 1b, and the air cleaner case 15 and the carburetor 11 are communicated with each other so that the air passing through the element 14 is transferred to the carburetor. 11 and a base duct 16 leading to the base duct 11.

As shown in FIG. 4, the element 14 has a substantially rectangular shape by covering both sides of a filter medium 17 made of a flat sponge or the like with an upper set plate 18 and a lower set plate 19 formed by integral molding of synthetic resin or the like. It is formed into a flat plate shape, and vent holes A of appropriate size are provided in the portions of both set plates 18 and 19 that cover the filter medium 17 to ensure air permeability and maintain appropriate rigidity. In addition, these filter media 17, both set plates 18, 1
A notch B for positioning to the air cleaner case 15 is formed at the rear end of each of the air cleaners 9 .

As shown in FIG. 3, the air cleaner case 15 has an upper surface 15a facing the bottom of the fuel tank 5 that slopes downward from the front end side (the left end side in FIG. 3) of the fuel tank 5 toward the rear end side. The fuel tank 5 is formed into a substantially box shape to effectively utilize the space formed between the inclined bottom plate 5e on the front end side of the fuel tank 5 and the head pipe 1a, as shown in FIGS. 4 and 5. As shown in FIG. 2, the lower case 20 is box-shaped and opens upward and houses the element 14 therein, and the upper cover 21 is generally plate-shaped and covers the opening of the lower case 20 from above. There is. These lower case 20 and upper cover 21 are each formed by integral molding of synthetic resin.

The lower case 20 sends air flowing in from the front wall 20a side to the base duct 16 from the bottom 20b side. A through hole 20d is formed sequentially from the upper end side, a communication hole 20e connected to the base duct 16 is formed in the bottom part 20b, and a boss part 20g with a threaded part is formed in the rear wall 20f.
is formed to protrude inward so as to fit into the notch B of the
Further, a stepped portion 20i for horizontally positioning the element 14 is formed on the inner surface of the front and rear walls 20a, 20f and the side wall 20h. This step 20
Due to the element 14 positioned horizontally at i, the inside of the lower case 20 has a primary storage chamber C located above the element 14 as shown in FIG.
Secondary storage chamber D located below the element 14
It is divided into The height of the rear wall 20f is smaller than that of the front wall 20a, and the upper end of the side wall 20h connecting the front wall 20a and the rear wall 20f is inclined downward toward the rear wall. are doing. Furthermore, a mounting portion 20j that is screwed onto the base duct 16 is formed to protrude outward from the side wall 20h.

The upper cover 21 is a thin plate shaped thing curved along the upper edge of the lower case 20, and has an engagement hole 21a formed at its front end side to fit into the locking piece 20c of the lower case 20 from the front. At the same time, a mounting hole 21b corresponding to the boss portion 20g is formed on the rear end side, so that it can be easily fixed to the lower case 20 with a single bolt 23 screwed into the boss portion 20g. . Also, this upper cover 2
1 is a rib 2 extending along the front-rear direction on its upper surface.
1c to increase rigidity and to prevent chatter vibrations from occurring during driving.

The inlet duct 22 is made of an elastic material such as rubber and is formed into a rectangular cylindrical shape, with an opening 22a at the tip facing downward, and an outer periphery through which the inlet duct 22 is inserted through the insertion hole 20d of the lower case 20. , a pair of collar portions 2 that sandwich the front wall 20a from the front and back.
2b and 22c are formed. These collars 2
2b and 22c not only increase the rigidity in the radial direction but also prevent a gap from forming between the outer periphery of the inlet duct 22 and the front wall of the lower case 20 when the peripheral wall of the inlet duct 22 is deformed in the radial direction. To prevent. Packings 24 and 25 are arranged on the mating surfaces of the upper cover 21 and the lower case 20, and on the mating surfaces of the element 14 and the stepped portion 20i of the lower case 20, respectively, to enhance the sealing effect.

As shown in FIG. 4, the base duct 16 is composed of an upper case 16a connected to the lower case 20 through a packing 26, and a lower case 16c connected to the carburetor 11 through an outlet duct 16b. The cases 16a and 16c are integrally molded from synthetic resin, and are joined vertically to form an expansion chamber. In addition, the upper case 16a
is screwed to the mounting portion 20j of the lower case 20 via a threaded portion 16d provided at its upper portion.

The air cleaner unit 13 configured as described above purifies the air sucked into the primary side storage chamber C of the air cleaner case 15 from the inlet duct 22 by the element 14, and then purifies the air into the secondary side storage chamber D and the base duct. carburetor 11 through 16
supply to.

As described above, the air cleaner case 15 of the present invention has a substantially box-like shape with an open top, and includes a lower case 20 that supports the air cleaner element 14 inside, and a plate-shaped upper part that covers the upper part of the lower case 20. Since the structure is simple, productivity can be improved by integrally molding the lower case 20 and the upper cover 21 from a synthetic resin material or the like. Furthermore, since the lower case 20 horizontally supports the flat plate-like element 14, a relatively large filtration area can be obtained even if the volume formed above and below the element 14 is small. Therefore, it is possible to measure the decrease in inhalation resistance. Furthermore, the plate-shaped upper cover 21, which tends to have lower rigidity than the lower case 20, has ribs 21c formed thereon to increase its rigidity, so chatter vibrations are less likely to occur due to vibrations from the engine, etc. It has excellent effects such as:

In addition, the air cleaner case of the present invention is provided so that the upper part gradually slopes downward from the front to the rear along the lower surface of the fuel tank, so that the lower space of the fuel tank, which was conventionally a dead space, is freed up. Effective use can be achieved, and a large capacity of the air cleaner case can be secured.

In addition, an inlet duct is connected to the upper front part of the air cleaner case configured as described above, and the air guided into the air cleaner case from the inlet duct is guided by the inclined inner surface of the upper part of the air cleaner case and flows downward. As a result, the entire surface of the air cleaner element is hit almost uniformly without forming any stagnation. As a result, uniform utilization over the entire surface of the air cleaner element,
In addition, effects such as reducing intake resistance can also be achieved.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an embodiment of a motorcycle to which the present invention is applied, Fig. 2 is a sectional view taken along the - line in Fig. 1, and Fig. 3 is a sectional view taken along the - line in Fig. 2. , Figure 4 is an exploded perspective view of the main parts of Figure 3, Figure 5 is an exploded perspective view of the main parts of Figure 3;
The figure is a longitudinal sectional view of the main part of FIG. 4. 1...Vehicle frame, 1a...Head pipe,
1b...Tank frame, 5...Fuel tank, 5
c...Fuel inlet, 5d...Cap, 5e...
Bottom plate, 5f...protrusion, 5g...inner bottom surface, 10...
...V-type 4-cylinder engine, 13...Air cleaner unit, 14...Air cleaner element (element), 15...Air cleaner case, 1
5a...Top surface, 16...Base duct, 17...
Filter medium, 18... Upper set plate, 19... Lower set plate, 20... Lower case, 20a
...Front wall, 20c...Locking piece, 20d...Through hole, 20f...Rear wall, 20i...Step, 21...
Upper cover, 21a...Engagement hole, 21b...Mounting hole, 21c...Rib, 22...Inlet duct, 22b, 22c...Flame, A...Vent hole, B
...Notch, C...Primary storage chamber, D...Secondary storage chamber.

Claims (1)

[Scope of utility model registration request] A fuel tank is provided across the tank frame immediately after the head pipe of a tank frame which is provided to be inclined downward from the head pipe, and the upper part of the air cleaner case is gradually inclined downward from the front part to the rear along the lower surface of the fuel tank. and an inlet duct is connected to the upper front part of the air cleaner case, and the air cleaner case has:
It consists of a substantially box-shaped lower case with an open top that horizontally supports a flat air cleaner element at an intermediate position in the vertical direction, and a plate-shaped upper cover that covers the upper part of the lower case. An air cleaner case for a motorcycle, characterized in that a rib is formed protrudingly on the upper surface of the air cleaner case.