JP2017198111A - Air cleaner for motor cycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filer material from backfire.SOLUTION: An air cleaner for a motor cycle includes a filter element having a filter material 10, and an extinction plate 20 made of a synthetic resin and disposed in a state of covering an intake outlet-side face of the filter material 10. The extinction plate 20 has a flat plate portion 21, and a number of communication ports 22 formed on a region corresponding to the filter material 10. Each of the communication ports 22 is composed of a cylindrical wall portion 22a cylindrically projecting from the intake outlet-side face 21a of the plate portion 21 to increase a distance between an intake outlet-side opening end 24 and a filter element 4-side opening end 25. Net-like portions 30 are integrally formed along opening ends 24 of the communication ports 22. By disposing the net-like portions 30 on these positions, extinction spaces 32 are respectively formed between the net-like portion 30 and the opening end 25 of each of the communication ports 22, and a distance between the net-like portion 30 and the filter material 10 is increased.SELECTED DRAWING: Figure 4

Description

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

  In a motorcycle engine, a backfire may occur in the intake system due to irregularities in the ignition timing of the engine, and this backfire may burn the filter material of the air cleaner arranged on the upstream side of the engine. . In order to protect the filter medium from the backfire, it is known to dispose a flame extinguishing plate over the filter medium as described in Patent Document 1. The flame extinguishing plate of Patent Document 1 is composed of two metal mesh members and a metal reinforcing member in which a large number of communication openings are formed. The flame extinguishing effect due to the slits in the mesh member and the flame due to heat transfer The flame is extinguished by the temperature drop, preventing the filter medium from burning.

JP 2013-155721 A

  However, since the flame extinguishing plate of Patent Document 1 is thin and the mesh member is arranged very close to the filter medium, it is sufficient that the flame propagates quickly and the flame penetrates the mesh member. May not be effective. Further, there is a problem that the weight of the air cleaner increases due to the metal flame extinguishing plate.

  An air cleaner for a motorcycle according to the present invention includes a case having an intake inlet and an intake outlet, a filter element that divides the inside of the case into an intake inlet side and an intake outlet side, and a surface of the filter element on the intake outlet side. And a synthetic resin flame-extinguishing plate disposed in a row. The flame-extinguishing plate has a large number of communication openings formed therein and a net-like portion that covers the communication openings. At least in a region facing the intake outlet, the communication port is formed in a cylindrical shape, and a net-like portion is provided along the end surface of the communication port on the intake outlet side.

  According to such a configuration, at least in a region facing the intake outlet, a flame extinguishing space is formed between the mesh portion and the end surface on the filter element side at each communication port, and the distance between the mesh portion and the filter element is large. Thus, the flame is extinguished without reaching the filter element. Therefore, even if it is a synthetic resin flame-extinguishing plate, sufficient flame-extinguishing effect is acquired.

  In a preferred aspect of the present invention, the communication port is configured as an opening having a small dimension in the thickness direction of the flame extinguishing plate in a part of the region away from the intake port of the flame extinguishing plate.

  Moreover, in one preferable aspect of the present invention, each of the communication ports has a circular cross section or a polygonal cross section.

  According to the present invention, it is possible to effectively prevent the filter element from being burnt by the backfire. Moreover, according to this invention, the weight reduction of an air cleaner can be achieved by making the flame-extinguishing plate into a product made of synthetic resin.

Sectional drawing of the air cleaner which concerns on this invention. The disassembled perspective view of the flame-extinguishing plate and filter element of 1st Example. The top view of a flame-extinguishing plate similarly. Sectional drawing of a flame-extinguishing plate and a filter element similarly. The perspective view of the flame-extinguishing plate of 2nd Example. Sectional drawing of a flame-extinguishing plate similarly. The top view of the flame-extinguishing plate which shows the example of a change of a communicating port. The top view of the flame-extinguishing plate which shows the other example of a change of a communicating port.

  Hereinafter, a first embodiment of an air cleaner 1 for a motorcycle according to the present invention will be described in detail with reference to FIGS. FIG. 1 shows a cross-sectional view of an air cleaner 1 of the first embodiment.

  The air cleaner 1 includes a case body 2 made of synthetic resin, 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 in the opening. The lower surface of the case body 2 is provided with a recess 2a for avoiding interference with a rear wheel (not shown). The cover 3 has a substantially triangular outer shape with an open bottom surface, and is attached to the case body 2 so as to cover the filter element 4. The filter element 4 partitions the internal space of the air cleaner 1 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 in one side wall which is a side surface of the cover 3. A connecting tube 8 serving as a part of the intake passage is attached to an end wall 2b serving as one end in the longitudinal direction of the case body 2. The connecting tube 8 is bent in a substantially inverted S shape, and an upstream end protruding into the clean side chamber 6 opens as an intake outlet 9 in the vicinity of the filter element 4 and protrudes outward from the case body 2. The downstream end portion is connected to an intake pipe (not shown).

  As shown in FIG. 2, the filter element 4 includes a filter medium 10 made of filter paper and a frame 12 made of synthetic resin. The frame 12 has a substantially triangular shape along the shape of the opening surfaces of the case main body 2 and the cover 3, and has a rectangular filter medium accommodating portion 14 that accommodates the filter medium 10. Four support pieces 15 projecting inward from the pair of long side walls 14a are provided at the edge of the filter medium accommodating portion 14 on the clean side chamber 6 side, and each of the support pieces 15 is provided with a cylindrical mounting pin 15a. It has been. The filter medium 10 is arranged in the filter medium accommodating portion 14 in a state of being folded back multiple times, and is supported by being attached to the frame 12 by the surface 10 a on the intake outlet 9 side entering the inside of the support piece 15.

  Further, in the present invention, the flame extinguishing plate 20 is disposed so as to overlap the filter element 4 so as to cover the entire surface 10a of the filter medium 10 on the intake outlet 9 side (clean side chamber 6 side). The flame-extinguishing plate 20 is made of a synthetic resin such as polypropylene, and as shown in FIG. 3, a pair of long edge portions 20a and 20b along the long side, a pair of short edge portions 20c and 20d along the short side, Is formed in a rectangular shape along the outer edge of the filter medium accommodating portion 14. The flame extinguishing plate 20 includes a flat plate portion 21, a large number of communication ports 22 formed in a region corresponding to the filter medium 10, and a relatively thick peripheral portion provided around the plate portion 21. 23. Each communication port 22 has a circular cross section. In addition, four attachment holes 23a are formed in the peripheral edge portion 23 along the long edge portions 20a and 20b. The flame extinguishing plate 20 is mounted on the outer edge of the filter medium accommodating portion 14 by heating and caulking (thermally welding) the mounting pins 15a inserted into the mounting holes 23a. FIG. 2 shows a state before welding.

  As shown in FIG. 4, each communication port 22 is configured to have a cylindrical shape in which an opening end 24 on the intake outlet 9 side and an opening end 25 on the filter element 4 side are separated from each other. In other words, the cylindrical wall portion 22a constituting each communication port 22 protrudes in a cylindrical shape from the surface 21a on the intake outlet side of the plate portion 21 over a predetermined height. Is configured as a passage-shaped opening having a large dimension in the thickness direction of the flame-extinguishing plate 20. In the example of illustration, each cylindrical wall part 22a is united with the adjacent cylindrical wall part 22a.

  Further, a mesh-like net-like portion 30 is integrally formed along the opening end 24 of each communication port 22 on the intake outlet 9 side. By providing the mesh portion 30 at this position, a flame extinguishing space 32 is formed between the mesh portion 30 and the opening end 25 on the filter element 4 side in each communication port 22. In each communication port 22, the height of the cylindrical wall portion 22 a is set so that a sufficient flame extinguishing space 32 can be secured between the mesh portion 30 and the opening end 25.

  As shown in FIG. 3, each mesh portion 30 has a plurality of horizontal line portions 34 extending in parallel with the long edges 20 a and 20 b of the flame extinguishing plate 20, and extends in parallel with the short edges 20 c and 20 d, that is, the horizontal line portions 34. And a plurality of vertical line portions 35 orthogonal to each other. A plurality of meshes are formed by the horizontal line portion 34 and the vertical line portion 35. The horizontal line portion 34 and the vertical line portion 35 are formed in a rectangular cross section and have the same thickness. The cross-sectional areas of the horizontal line part 34 and the vertical line part 35 have an equivalent diameter of about 0.35 mm in order to realize a sufficient flame-extinguishing effect while suppressing airflow resistance. The horizontal line portion 34 and the vertical line portion 35 are formed so as to be in contact with each other at different height positions in consideration of the fluidity of the synthetic resin during molding (FIG. 4).

  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 and reaches the flame extinguishing plate 20. At this time, the flame is distributed to each communication port 22 and extinguished by each mesh portion 30. Even if some flames are not extinguished by the mesh part 30 and pass through the mesh part 30 and enter the communication port 22, the mesh part 30 of each communication port 22 and the opening end 25 on the filter element 4 side. Since the filter medium 10 is separated from the mesh portion 30, the flame is extinguished without reaching the filter medium 10. Therefore, even if it is the flame retardant plate 20 made from a synthetic resin, a sufficient flame retardant effect can be obtained. And the air cleaner 1 becomes lightweight by making the flame-extinguishing plate 20 from synthetic resin.

  Next, a second embodiment of the flame extinguishing plate 20 will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the component same as 1st Example mentioned above, and the overlapping description is abbreviate | omitted.

  In this embodiment, the communication port includes a cylindrical communication port 22 and a second communication port 42 configured as an opening having a small dimension in the thickness direction of the flame extinguishing plate.

  The second communication port 42 is formed in a circular opening in the plate portion 21 and does not include the cylindrical wall portion 22a. That is, the dimension of each second communication port 42 in the flame extinguishing plate thickness direction is substantially the same as the plate thickness of the plate portion 21. In addition, as shown in FIG. 6, the mesh portion 30 is integrally formed along the opening of each second communication port 42.

  The cylindrical communication port 22 is disposed in a region about 2/3 of the length of the flame extinguishing plate 20 which is a region facing the intake outlet 9 which is easily affected by the backfire. On the other hand, the 2nd communicating port 42 is arrange | positioned in the area | region about 1/3 of the length of the flame-extinguishing plate 20 which is hard to receive to the influence of a backfire, and is the area | region away from the inlet / outlet 9 of the flame-extinguishing plate 20.

  In this way, by arranging the cylindrical communication port 22 only in the region facing the intake outlet 9, the flame extinguishing plate 20 does not become unnecessarily thick, and the air cleaner 1 can be miniaturized.

  As mentioned above, although one Example of this invention was described, this invention is not restricted to the said Example, A various change is possible.

  In the above embodiment, the communication ports 22 and 42 have a circular cross section. However, the present invention is not limited to this, and may have other cross sectional shapes as shown in FIGS.

  In the modification shown in FIG. 7, each communication port 52 has a hexagonal cross section. Each communication port 52 is arranged in the flame extinguishing plate 20 so that a pair of opposite sides are parallel to the long edges 20a and 20b of the flame extinguishing plate 20.

  Further, in the modification shown in FIG. 8, each communication port 62 has a triangular cross section. The communication port 62 is disposed in the flame extinguishing plate 20 so that the bottom is parallel to the short edges 20c and 20d of the flame extinguishing plate 20, and the apex is the communication port 62a with the apex facing the short edge 20d. The communication ports 62b facing the short edges 20c are alternately arranged.

  In the example shown in FIGS. 7 and 8, the cylindrical communication ports 52 and 62 are arranged on the entire surface of the plate portion 21, but on the short edge portion 20 c side, which is a region away from the intake outlet 9, You may comprise 52 and 62 as an opening with a small dimension of the flame-extinguishing plate thickness direction.

DESCRIPTION OF SYMBOLS 1 Air cleaner 4 Filter element 10 Filter medium 20 Flame extinguishing plate 22 Communication port 30 Mesh part

Claims (3)

A case having an intake inlet and an intake outlet, a filter element that divides the inside of the case into an intake inlet side and an intake outlet side, and a flame extinguishing made of a synthetic resin arranged on the surface of the filter element on the intake outlet side A plate, and
The flame-extinguishing plate has a large number of communication openings formed therein, and includes a net-like portion that covers the communication openings. At least in the region facing the intake outlet, the communication openings are configured in a cylindrical shape, An air cleaner for a motorcycle, wherein the mesh portion is provided along an end surface of the communication port on the intake outlet side.   2. The motorcycle according to claim 1, wherein the communication port is configured as an opening having a small dimension in the thickness direction of the flame extinguishing plate in a part of the flame extinguishing plate away from the intake outlet. Air cleaner.   The air cleaner for a motorcycle according to claim 1 or 2, wherein each of the communication ports has a circular cross section or a polygonal cross section.

Images