JP6804244B2 - Air cleaner for motorcycles - Google Patents

Description

The present invention relates to an air cleaner used in a motorcycle.

In a motorcycle engine, backfire may occur in the intake system due to irregular ignition timing of the engine, etc., and this backfire may burn the filter medium of the air cleaner located on the upstream side of the engine. .. In order to protect the filter medium from the backfire, it is known that the flame-extinguishing member is arranged on the filter medium as described in Patent Document 1. The flame-extinguishing member of Patent Document 1 is composed of two metal mesh members and a metal reinforcing member having a large number of communication ports formed through openings. By arranging this flame-extinguishing member so as to cover the entire top surface of the filter medium formed in a rectangular parallelepiped shape by urethane, the flame is extinguished by the flame-extinguishing effect due to the gaps of the mesh member and the temperature drop of the flame due to heat transfer, and the filter medium is burnt. Is being prevented.

Japanese Unexamined Patent Publication No. 2013-155721

As a filter medium for an air cleaner, a filter paper obtained by folding back a plurality of filter papers so as to have a plurality of pleats is known. With such filter media, the top of the pleats is closest to the flame, so local scorching is likely to occur. However, the flame-extinguishing member of Patent Document 1 cannot effectively prevent such local scorching. Further, since the flame-extinguishing member of Patent Document 1 is formed by laminating three metal members, there is also a problem that the weight of the air cleaner increases.

The air cleaner for motorcycles according to the present invention is
Cases with intake inlets and intake outlets,
A filter element in which a filter medium that is folded back so as to have a plurality of pleats is supported by a frame, and a filter element.
Have a plurality of ribs which covers the top of the suction outlet side of said pleated respectively, these ribs have a spacing so as to form a grid pattern formed in parallel with each other as a whole, and the intake passage between the adjacent ribs The imaged flame-extinguishing member and
To be equipped.

According to such a configuration, since the top of the pleats on the intake outlet side is directly protected by the rib, the scorching of the top is suppressed. Then, the flame is extinguished while passing between the ribs due to the flame-extinguishing effect due to the gap between the adjacent ribs.

In a preferred embodiment of the present invention, the flame extinguishing member is formed integrally with the frame.

Further, in a preferred embodiment of the present invention, the flame extinguishing member is formed separately from the frame and is arranged so as to cover the filter medium on the intake outlet side of the frame. Each rib has a groove that receives the top of the pleats.

Since each rib has a groove in this way, the top of the pleats enters the groove and the position of the pleats is constrained.

Further, in a preferred embodiment of the present invention, each rib has a substantially triangular cross section elongated in the thickness direction of the filter medium.

According to such a configuration, the flow of intake air passing through the filter medium is not obstructed, and the ribs have an inclined surface having a long distance, so that the flame extinguishing effect is improved.

Further, in a preferred embodiment of the present invention, the flame extinguishing member is formed of a synthetic resin.

According to the present invention, it is possible to effectively prevent the filter medium from being scorched by the backfire. Further, according to the present invention, the weight of the air cleaner can be reduced.

Sectional drawing of the air cleaner which concerns on this invention. The perspective view of the filter element which concerns on 1st Example. Sectional drawing of the filter element along lines III-III of FIG. Similarly, an enlarged cross-sectional view of the filter element. The exploded perspective view of the filter element and the flame extinguishing member which concerns on 2nd Example. FIG. 5 is an enlarged cross-sectional view of the flame extinguishing member along the line VI-VI of FIG.

Hereinafter, the first embodiment of the air cleaner 1 for a motorcycle according to the present invention will be described in detail with reference to FIGS. 1 to 4.

The air cleaner 1 includes a case 11 composed of a case body 2 made of synthetic resin and a cover 3 made of synthetic resin, and a filter element 4 sandwiched between the case body 2 and the cover 3.

The case body 2 has a substantially triangular opening on the upper surface, and the filter element 4 is detachably attached to the opening. The lower surface of the case body 2 is provided with a recess 2a for avoiding interference with a rear wheel or the like (not shown). The cover 3 has a substantially triangular outer shape with an open lower surface, and is attached to the case body 2 so as to cover the filter element 4. The internal space of the air cleaner 1 is partitioned by the filter element 4 into a dust side chamber 5 on the cover 3 side and a clean side chamber 6 on the case body 2 side. An intake inlet 7 is formed as an opening on the side surface of the cover 3. A connecting tube 8 that is a part of the intake passage is attached to an end wall 2b that is one end in the longitudinal direction of the case body 2. The connecting tube 8 is bent in a substantially inverted S shape in FIG. 1, and the upstream end portion protruding into the clean side chamber 6 opens as an intake outlet 9 in the vicinity of the filter element 4, and is outside the case body 2. The downstream end protruding toward the direction is connected to an intake pipe (not shown).

The filter element 4 has a filter medium 10 made of filter paper and a frame 12 that supports the filter medium 10. The frame 12 is made of a synthetic resin such as polypropylene. As shown in FIG. 2, the frame 12 has a substantially triangular shape along the shapes of the opening surfaces of the case body 2 and the cover 3, and has a filter medium accommodating portion 14 for accommodating the filter medium 10. The filter medium accommodating portion 14 is formed in a rectangular shape from a pair of long side walls 14A and a pair of short side walls 14B. Further, the filter media accommodating portion 14 has an intake outlet side edge 15 facing the clean side chamber 6 on the intake outlet 9 side and an intake inlet side edge 16 facing the dust side chamber 5 on the intake inlet 7 side (FIG. 3) and.

As shown in FIGS. 3 and 4, the filter medium 10 is arranged in the filter medium accommodating portion 14 in a state of being folded back in a wavy shape so as to have a plurality of pleats 17. Each pleated 17 has a substantially V-shaped cross-sectional shape, and has a top 18 on the intake outlet 9 side facing the clean side chamber 6 and a pair of side surfaces 19 serving as filtration surfaces. The top 18 is continuous between one long side wall 14A and the other long side wall 14A of the filter medium accommodating portion 14, and is parallel to each other so that one short side wall 14B and the other short side wall 14B are short. It is provided at equal intervals from the side wall 14B. All pleats 17 are equal in height and all tops 18 are coplanar. The top portion 18 is located recessed from the intake outlet side edge 15 of the filter medium accommodating portion 14.

Further, the filter element 4 is integrated with the plurality of ribs 20, and the plurality of ribs 20 form the flame extinguishing member 27. The rib 20 is integrally formed with the frame 12 so as to cover and wrap the top 18 of the pleats 17. As shown in FIG. 2, the ribs 20 are along the top 18 and are continuous between the pair of long side walls 14A of the filter media accommodating portion 14 and at regular intervals between the pair of short side walls 14B. A plurality of them are formed so as to be parallel to each other. The ribs 20 are formed in a grid pattern as a whole, and an intake passage 21 is defined between the adjacent ribs 20 and the ribs 20 (FIG. 3).

As shown in FIG. 4, each rib 20 has a substantially triangular cross section elongated along the thickness direction of the filter medium 10. The rib 20 has a tip portion 22, a bottom surface 24 that wraps the top portion 18 along the top portion 18 of the pleats 17, and a pair of inclined surfaces 26 that extend between the tip portion 22 and the bottom surface 24. .. Therefore, the bottom surface 24 on the top 18 side of the pleats 17 is the base of the substantially triangular cross section of the rib 20. The plurality of ribs 20 have the same cross-sectional shape. That is, the heights of all the ribs 20 (the distance between the tip portion 22 and the bottom surface 24) are equal, and the heights are set so as to provide a sufficient flame-extinguishing effect. The height of the rib 20 is, for example, about 5 mm. All the tip portions 22 are located on the same plane, and the inclined surface 26 is smoothly continuous with the side surface 19 of the pleats 17.

The filter element 4, that is, the filter medium 10, the frame 12, and the rib 20 are integrally formed by, for example, insert molding. Specifically, the synthetic resin material is poured into the mold with the filter media 10 folded back in a wavy shape set in the mold and the pleats 17 are restrained, and the ribs 20 and the frame 12 are molded together with the filter media 10. Therefore, the rib 20 is surely formed along the top 18 of the pleats 17.

In the above configuration, when a backfire occurs, the flame flows back from the engine side through the connecting tube 8 into the clean side chamber 6. At this time, the flame is dispersed by the rib 20 and extinguished by the temperature drop due to heat transfer while propagating to the downstream side of the rib 20. In particular, since the top 18 of the pleats 17, which is the position closest to the flame, is covered and protected by the ribs 20, the top 18 is prevented from being scorched. Further, due to the flame-extinguishing effect due to the gap between the adjacent ribs 20, the flame does not penetrate the flame-extinguishing member 27 and is extinguished without reaching the side surface 19 of the pleats 17, even when the propagation speed of the flame is high. In particular, since the rib 20 has a substantially triangular cross section and has a sufficient height, the flame is surely extinguished while passing between the ribs 20. Therefore, even the flame-extinguishing member 27 made of synthetic resin can sufficiently prevent the filter medium 10 from being scorched. The air cleaner 1 is made lighter by integrally forming the frame 12 and the rib 20 using synthetic resin.

Next, a second embodiment of the flame extinguishing member will be described with reference to FIGS. 5 and 6. The same components as those in the first embodiment described above are designated by the same reference numerals, and duplicate description will be omitted.

In this embodiment, the flame extinguishing member 30 having a plurality of ribs 20 is formed separately from the frame 12. The flame-extinguishing member 30 is arranged so as to cover the entire surface 10a of the filter medium 10 on the intake outlet side 9 side so as to be overlapped with the intake outlet side edge 15 of the filter medium accommodating portion 14.

The flame extinguishing member 30 is formed of the same synthetic resin as the frame 12, and is composed of a pair of long edge portions 31A along the long side and a pair of short edge portions 31B along the short side, thereby forming a filter medium accommodating portion 14. It has a subframe 31 formed in a rectangular shape along the outer edge of the. The ribs 20 are provided at equal intervals so as to be continuous between the pair of long edge portions 31A of the subframe 31 and parallel to each other between the pair of short edge portions 31B. .. Further, two mounting holes 33 are formed inside each of the pair of long edge portions 31A of the subframe 31.

As shown in FIG. 6, each rib 20 has a substantially triangular cross section elongated along the thickness direction of the filter medium 10 as in the above-described embodiment, and the tip portion 22 and the top portion 18 of the pleats 17 are formed. It has a bottom surface 24 that wraps around the top portion 18 along the line, and a pair of inclined surfaces 26 that extend between the tip portion 22 and the bottom surface 24. A groove 24a for receiving the top 18 of the pleats 17 is formed on each bottom surface 24. The groove 24a is curved according to the outer shape of the top 18, and is continuous along the longitudinal direction of the rib 20. Therefore, the bottom surface 24 on the top 18 side of the pleats 17 is the base of the substantially triangular cross section of the rib 20.

As shown in FIG. 5, the filter medium accommodating portion 14 of the frame 12 has four support pieces 32 protruding inward from the intake outlet side edge 15 of the pair of long side walls 14A, and each support piece 32 has a circle. A columnar mounting pin 34 is provided.

The flame extinguishing member 30 is mounted on the intake outlet side edge 15 by heating and caulking (heat welding) the mounting pin 34 inserted into the mounting hole 33. Note that FIG. 5 shows the state before welding.

As described above, since each rib 20 has a groove 24a, the top portion 18 of the pleats 17 enters the groove 24a in a state where the flame extinguishing member 30 is attached to the frame 12. Therefore, the top 18 of the pleats 17 is constrained to the rib 20. Therefore, as in the above-described embodiment, the top 18 of the pleats 17 is covered and protected by the ribs 20, so that the top 18 is prevented from being scorched. Further, due to the flame-extinguishing effect due to the gap between the adjacent ribs 20, the flame does not penetrate the flame-extinguishing member 30 and is extinguished without reaching the side surface 19 of the pleats 17, even when the propagation speed of the flame is high. In this embodiment, by separating the flame extinguishing member 30 from the frame 12, the material of the flame extinguishing member 30 can be appropriately selected according to the usage conditions and the like.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made.

In the second embodiment, the flame-extinguishing member 30 is formed of the same synthetic resin as the frame 12, but the flame-extinguishing member 30 is formed of a material different from that of the frame 12, such as other synthetic resin, metal, rubber, and elastomer. You may.

1 Air cleaner 4 Filter element 7 Intake inlet 9 Intake outlet 10 Filter material 11 Case 12 Frame 17 Pleats 18 Top 20 Ribs 27,30 Flame extinguishing member

Claims (5)

Cases with intake inlets and intake outlets,
A filter element in which a filter medium that is folded back so as to have a plurality of pleats is supported by a frame, and a filter element.
Have a plurality of ribs which covers the top of the suction outlet side of said pleated respectively, these ribs have a spacing so as to form a grid pattern formed in parallel with each other as a whole, and the intake passage between the adjacent ribs The imaged flame-extinguishing member and
Air cleaner for motorcycles equipped with. The air cleaner for a motorcycle according to claim 1, wherein the flame-extinguishing member is integrally formed with the frame. The flame-extinguishing member is formed separately from the frame, and is arranged so as to cover the filter medium on the intake outlet side of the frame.
The air cleaner for motorcycles according to claim 1, wherein each rib has a groove for receiving the top of the pleats. The air cleaner for a motorcycle according to any one of claims 1 to 3, wherein each rib has a substantially triangular cross section elongated in the thickness direction of the filter medium. The air cleaner for a motorcycle according to any one of claims 1 to 4, wherein the flame extinguishing member is made of a synthetic resin.

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