JPS6237953Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a filter holder for an air cleaner that is attached to the inner surface of a polyurethane filter to maintain its shape.

Air cleaners for motorcycles and the like that use polyurethane filters have a basic configuration as shown in FIG. An inlet 2 and an outlet 3 are opened in an appropriately shaped air cleaner case 1, and a filter 4 is shaped like a container with one side open.
Place it over the outlet 3 opening in the case 1. There is a sufficient gap between the outer surface of the filter 4 and the inner surface of the case 1, and the air introduced from the inlet 2 passes from the entire outer surface of the filter 4 to the inner surface and is led out from the outlet 3. In this case, since the filter 4 is made of extremely soft polyurethane, a holder 5 having a porous structure of the same shape as the filter 4 is attached to the inner peripheral surface, and the holder 5 and the holder 5 are fixed to a bracket 6 installed over the opening of the outlet 3. A predetermined shape is maintained. At the same time, the periphery of the open surface of the holder 5 presses an inner flange-shaped seal filter 7 provided on the periphery of the open surface of the filter 4 against the inner surface of the case 1 to ensure sealing performance.

Incidentally, it is desirable that the overarea of the filter 4 is set as wide as possible, but it is difficult to increase the overarea without changing the case 1 and without changing the size of the seal filter 7 from the standpoint of sealing performance. It is effective to have an inverted trapezoidal cross-sectional shape with the open surface turned back as shown in FIG. 2a. In FIG. 2, b shows a rectangular cross-sectional shape and c shows a trapezoidal cross-sectional shape. If the open surfaces are the same, the surface area is a>b
It is clear that >c. Furthermore, the larger the inclination angle α of the inverted trapezoidal cross section, the larger the overlapping area. However, since the holder 5 to be attached to the inner surface is inserted from the open bottom surface, the size of the top surface 5a of the holder 5 is set so as not to exceed the elastic limit. That is, the angle of inclination α
It is not allowed to make it too large, and therefore there is a limit to the method of increasing the overarea by using an inverted trapezoidal cross-sectional shape.

In view of the above points, this idea was developed by setting an inverted trapezoidal cross-sectional shape with a large inclination angle so that a polyurethane filter with a large overarea can be used, and it can be inserted easily from the open surface of the filter and attached to the inner surface of the filter. The present invention provides a filter holder for an air cleaner.

FIG. 3 is a sectional view of an air cleaner showing an embodiment of the filter holder of this invention, and FIG. 4 is a plan view of the holder.

The air cleaner case 8 is made up of a cap 8a, and has an inlet 9 at the top and an outlet 10 at the center of the side. A bracket 13 having a screw 12 protruding from the top surface 11 is provided at the opening of the outlet 10 . The filter 15 has an inverted trapezoidal cross-sectional shape with the open surface as the base, and an inner flange-shaped seal filter 16 is provided protruding from the periphery of the open surface.

The filter holder includes a main holder 17 having a rectangular or trapezoidal cross-sectional shape with an open surface periphery 17a having a shape corresponding to the seal filter 16, and a main holder 17 having a trapezoidal cross section with the open surface as the base, and a main holder 17 that has a trapezoidal cross section with the open surface periphery 17a as a base.
5 Funnel-shaped sub-holder 18 extending along the inner peripheral surface
It has a double structure with a W-shaped cross section.
Both the main holder 17 and the sub-holder 18 have an open-mesh basket shape as shown in the fourth figure, and are integrally molded from synthetic resin. A washer plate 19 is connected to the center of the top surface of the main holder 17, and a screw insertion hole 20 is provided at the center. The tip edge of the sub-holder 18 is a ring 18a.

With the above configuration, the ring 1 of the sub holder 18
While elastically deforming the sub-holder 8a to reduce its size, the sub-holder 18 is inserted into the filter 15 from the open surface along with the main holder 17, and after insertion, the sub-holder 18 is elastically restored and comes into contact with the inner surface of the filter 15. In this way, the filter 15 with the filter holder attached is placed over the outlet 10 opening on the inner surface of the case 1, and the screw 1 of the bracket 13 is inserted into the screw insertion hole 20 on the top surface of the main holder.
2, pass the screw 12 through the filter 15 as well, and tighten it with a wing nut 21. At this time, the open surface periphery 17a of the main holder 17 presses the seal filter 16 against the inner wall of the case 8, and the filter 15 is set in the outlet 10 opening with good sealing performance.

As explained above, the filter holder of the air cleaner according to this invention has a main holder that is large enough to be inserted from the open surface and elastically deformed to the filter having an inverted trapezoidal cross-sectional shape with the open surface as the base. It has a double structure with a funnel-shaped sub-holder that restores itself after being inserted from the open surface and comes into contact with the inner peripheral surface of the filter, allowing it to be easily set on the filter and performs the dual functions of attaching the filter and maintaining its shape. Therefore, the filter can be made to have an inverted trapezoidal cross section with a large inclination angle to increase the overarea. This means that the excess area can be increased without changing the size of the case or impeding air circulation, and it is possible to improve engine output in terms of intake efficiency through conventional space distribution. It is effective for use in air cleaners for motorcycles.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the basic configuration of an air cleaner using a polyurethane filter, Fig. 2 is an explanatory drawing showing the relationship between the shape of the filter and the overarea,
FIG. 3 is a longitudinal cross-sectional view of an air cleaner showing an embodiment of the filter holder of the air cleaner of this invention, and FIG. 4 is a side view of the air cleaner holder as viewed from arrow A in FIG. 8... Air cleaner case, 8a... Cap, 9... Inlet, 10... Outlet,
13...bracket, 15...filter, 16...
...Seal filter, 17...Main holder, 18
...Sub holder.

Claims (1)

[Scope of utility model registration request] A container-shaped filter with an open bottom and a coarse holder attached to its inner circumferential surface are placed over the outlet opening in the case, and the top surfaces of both are fixed to a support stand built over the inlet opening. In the air cleaner, the filter is configured to have an inverted trapezoidal cross section with the open surface as the base, and a main holder with a rectangular or trapezoidal cross section with the open surface as the base, and an elastic holder extending from the periphery of the bottom surface along the inner surface of the filter. A filter holder for an air cleaner characterized by a double structure of sub-holders.