JPS632596Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an air filter suitable for two-wheeled motor vehicles, and eliminates the body cap (case lid) that is generally provided for cleaning and replacing elements to obtain a simple configuration. It is an object.

Conventional products require a large number of parts and assembly man-hours due to the above-mentioned cap, and when looking at the manufacturing cost and assembly man-hours of the entire air filter, the parts manufacturing cost and assembly man-hours related to the cap are too large to be ignored. occupies a large proportion. Furthermore, it is difficult to provide a perfect seal against water and dust between the cap and the case (body), and there is a risk that water, dust, etc. may enter the filter. As a prior art, there is Utility Application No. 179349/1983.

In order to solve the above-mentioned conventional problems, this invention
This device uses a holder to hold the filter element to close the opening of the case, and is constructed as follows.

That is, in the present invention, an outlet opening is formed by the opening of a bowl-shaped case having an opening at one end, the outlet opening is connected to the carburetor via a passage in the duct, and the opening is formed in the wall of the case. Separately, the inlet side opening is opened to the atmosphere,
A bowl-shaped filter element is arranged inside the case with the outlet side chamber formed by the inner space facing the outlet opening in an open position, and the filter element is placed in the inlet side opening between the inner surface of the case and the element. The concave inner surface of the element is held by a holder forming a communicating inlet side chamber and having a passage for air circulation, and the edge of the holder is attached to the peripheral edge of the outlet side opening of the case through a sealing means. seated, the holder is removably fixed to the case by a fixing means, and the holder is attached to the periphery of the inlet side end of the duct.
A portion is provided that fits into the outer periphery of the edge of the holder and enters between the periphery of the outlet side opening of the case and the edge of the holder seated thereon, and the portion is connected to the periphery of the case and the edge of the holder. The inlet end of the duct is fixed to the edge of the holder to form an assembly of the holder and the duct, and the outlet opening is closed by the assembly. It is a feature.

Next, embodiments will be described with reference to the drawings.

In FIG. 1, which is a left side view, the air filter 1 is arranged below the rear end of the upperture tube 2 and in front of the upper end of the down tube 3 of the motorcycle, and the carburetor 4 is arranged in front of the air filter 1. It has been done. In FIG. 2, which corresponds to the cross-sectional view taken from FIG. The duct 8 is a member that extends forward from the holder 6 and connects to the carburetor 4, and is shown in FIG. 2 as if it extends upward for clarity of structure.

As shown in FIG. 3, which is a partially cutaway front view, and FIG. 4, which is a plan view, the case 7 is a synthetic resin molded product such as polyethylene, and has a roughly bowl-shaped structure with an opening 10 at one end. It has an air inlet 11 and a bracket 12 at the lower end. Air inlet 11
has a generally rectangular shape elongated in the longitudinal direction of the vehicle body, and is integrally provided with the case 7 with a peripheral wall 13 surrounding the air inlet 11 projecting upward. The peripheral wall 13 is provided with recesses 15 and 16 into which the upper tube 2 is fitted. The recess 16 is provided in the front portion 17 of the peripheral wall 13 and in the case body portion 18 below it. 2
0 and 21 are depressions 1 formed by the front part 17 of the peripheral wall.
The side edges of 5, 22, 23 and 24 are the main body part 1
These are the side edges and bottom edge of the depression 15 formed by the groove 8. The side edges 20, 21 extend straight and parallel to each other downward. A side edge 22 opposite to the opening 10 extends in a concave arc shape and is continuous with a bottom edge 24. The side edge 23 is inclined so as to approach the side edge 22 as it goes downward. The bottom edge 24 is the part 2 on the opening 10 side.
5 is further depressed downward. The recess 16 is generally circular, the opening width of the upper part 26 is somewhat narrowed, and the recess 16 is provided in the rear part 27 of the peripheral wall 13. The arcuate side edge 22 and bottom edge 24 of the recess 15 and the arcuate inner edge 28 of the recess 16 fit into the upper part tube 2 in close contact with the upper part tube 2 so that the case 7 does not fall downward. can be attached to. Furthermore, the case 7 has elasticity, and when the case 7 is fitted into the upper tube 2 from below, the peripheral wall 13
etc. are elastically deformed and the upper parts 29, 2 of the depressions 15, 16
6 can pass around the upper part tube 2.

The bracket 12 protrudes downward from the main body of the case 7, and is fixed to the bracket 30 on the down tube 3 shown in FIG. 1 using bolts 31 and welding nuts 32. As shown in FIG. 3, the side 33 of the peripheral wall 13 on the duct 8 side projects upwardly from the other side 34, and as shown in FIG. 4, the rear of the side 33 has a recess 35 projecting outward. is provided.

In FIG. 2 and FIG. 5, which is a partial view of FIG. A portion 37 extending to the duct 8 side through the
It is integrally provided with an annular outward flange 38 that connects the tips of the. The head of the bolt 40 is cast into the center where the ribs 36 gather. bolt 40
is the central part 42 of the element 5 and the case end wall 41
The nut 43 protrudes outward through the hole, and a nut 43 is screwed into the protruding end.

The element 5 is a bowl-shaped body made of urethane or the like, and is inserted into the holder 6 from the end wall 41 side in an expanded state.
An annular outward flange 45 that abuts the flange 38 is provided at the right end.

The duct 8 is made of rubber, and is integrally provided with an outward flange 46 at the inlet end of the cylindrical main body.
An inward flange-shaped portion 48 is annularly provided at the tip of a cylindrical portion 47 protruding from the outer peripheral edge of the cylindrical portion 6 . Portion 47 fits on the outer peripheral surface of flange 38. The portion 48 fits into an annular notch 49 provided on the outer periphery of the flange 38 and
It is in close contact with the end face of 5.

The fitting abutment portions of the portions 47, 48 and the flanges 38, 45 are fitted in an inward flange 50 of the case 7 provided around the opening 10 in a sealed state.
That is, the flange 50 has an annular step extending toward the end wall 41, and the outer circumferential surface of the portion 47 is in close contact with the inner circumferential surface of the step. The holder 6 is pulled toward the end wall 41 by the bolts 40, and the tension causes the flange 38 to press the flange 45 against the flange 50 via the portion 48 and the like.

The assembly work is performed as follows. First, the element 5 is placed on the holder 6, the duct parts 47 and 48 are fitted on the flange 38, the element 5 and the holder 6 are housed in the case 7, and the nut 4 is placed on the holder 6.
Tighten 3. In addition, the case 7 fixes the bracket 12 at the lower end to the bracket 30 with bolts 31, and uses elastic deformation to form the recess 1 as described above.
5 and 16 into the upper tube 2. When cleaning or replacing the element 5, remove the case 7 from the upper tube 2 and bracket 30, remove the nut 43, and attach the case 7 to the element 5.
3. After cleaning and replacing the element 5, assemble each part in the reverse order.

The action is as follows. During engine operation, air sucked into the chamber 53 between the case 7 and the element 5 from the inlet 11 is filtered while passing through the element 5, and passes through the gap 54 between the ribs 36, 36 and between the sections 37, 37. It flows into the chamber 55 inside the holder 6 and is sent from the chamber 55 to the carburetor 4 via the duct 8.

As explained above, according to the present invention, the duct 8 is fixed to one end of the holder 6 that holds the filter element 5, and the duct 8 is placed inside the generally bowl-shaped case 7 having the opening 10 for attaching and detaching the holder at the end on the duct 8 side. The holder 6 is removably fixed, and the opening 10 of the case 7 is closed by the assembly of the holder 6 and the duct 8, so that the basic components of the air filter 1 are the filter element 5, the holder 6, and the case. 7 and the duct 10 are required, and a special cap for closing the opening 10 is not required, and the number of parts and assembly steps can be reduced, thereby reducing manufacturing costs. Of course, seal failures caused by the cap do not occur. In addition, this invention also reduces the number of parts to reduce costs, reduce weight, and increase air filter volume in the following points:
Furthermore, it is possible to reduce ventilation resistance and increase the element filtration area.

That is, generally, the inlet side opening of the air cleaner case is open to the atmosphere, but the outlet side opening is connected to the carburetor via a duct or the like.

Taking this into consideration, in the present invention, the holder 6
The opening that is closed is defined as an exit opening 10, and the inlet end of the duct 8 for connection to the carburetor 4 is fixed to the periphery of the opening of the case 7 using a holder 6.

This eliminates the need for a special means for fixing the duct 8 to the case 7, and makes it possible to use means for fixing the holder 6 to the case 7 (bolts 40, etc.) as the duct fixing means. It's summery.

In this way, the present invention can reduce the number of installation locations for the fixing means, thereby reducing the number of parts, reducing manufacturing costs and weight, and increasing the ratio of the air filter volume to the overall volume. .

Further, in the structure of the present invention, the sealing means for the holder 6 and the duct 8 are common sealing means (outer peripheral flange 4 of the element 5) as in the illustrated embodiment.
5) can be used. Therefore, in this respect as well, the present invention can reduce the number of parts.

Furthermore, in the present invention, the entrance of the carburetor side passage in the duct 8 is connected to the inside of the filter 1 through the opening 10 of the bowl-shaped case 7 having an opening 10 at one end (that is, an opening having an inner diameter that is approximately the same as the inner diameter of the case). It's communicating. Further, a bowl-shaped element is adopted as the filter element 5, and the space 55 inside the element 5 is connected to the case opening 10.
It is placed in an open position facing towards the front.

Therefore, air flows into the carburetor side passageway from the entire space 55 on the downstream side of the element 5 in a generally uniform state, thereby reducing ventilation resistance.

Furthermore, according to the above structure of the present invention, air flows evenly from the entire inner space 55 of the element 5 to the carburetor side passage, in other words, the suction force (negative pressure) of the carburetor side passage is uniform throughout the element 5. It acts on Therefore, almost the entire element 5 equally performs the filtering function.

Further, although the outer surface (convex surface) of the bowl-shaped element 5 has a larger area than the inner surface (concave surface), air flows into the element 5 from the outer surface.

Therefore, the effective filtration area (the area that actually performs the filtration function) of the element 5 is wide, and the filtration function can be improved and the cleaning/replacement cycle of the element can be extended.

Also, as in the illustrated embodiment, the urethane element 5
flange 45 and parts 47, 4 of the rubber duct 8
8 etc., fit the flange 38 of the holder 6 to the stepped flange 50 of the case 7, and bolt 40.
When applying a tightening force to the fitting part,
It is possible to improve the sealing performance of the flange 50 portion and prevent vibration of each part.

In addition, when embodying this invention, element 5,
The assembly structure of the holder 6 and the duct 8 can be varied in various ways. For example, the holder 6 can be provided with an inward flange and the duct 8 can be connected to the flange. In place of the recesses 15 and 16, a bracket for mounting the case may be provided.

[Brief explanation of the drawing]

Figure 1 is a left side view of the embodiment, Figure 2 is a cross-sectional view of Figure 1, Figures 3 and 4 are a partially cutaway front view and plan view of the case, and Figure 5 is Figure 2. FIG. 3 is a left side view of the holder corresponding to the - arrow view of FIG. 1... Air filter, 4... Carburetor,
5... Filter element, 6... Holder,
7...Case, 8...Duct, 10...Opening, 1
1... Air inlet, 53... Inlet side chamber, 54...
Gap (passage), 55...room on the exit side.

Claims (1)

[Scope of utility model registration request] An outlet side opening is formed by the opening of the bowl-shaped case having an opening at one end, and the outlet side opening is connected to the carburetor through a passage in the duct, and an inlet side is connected to the wall of the case apart from the opening. The opening is opened to the atmosphere, and the bowl-shaped filter element is placed inside the case with the outlet side chamber formed by the space inside thereof facing the outlet opening in an open position, and the inner surface of the case is An inlet side chamber communicating with the inlet side opening is formed between the element and the inlet side opening, the concave inner surface of the element is held by a holder having a passage for air circulation, and the edge of the holder is sealed via a sealing means. The holder is seated on the peripheral edge of the outlet side opening of the case, the holder is removably fixed to the case by a fixing means, and the holder is fitted onto the peripheral edge of the inlet side end of the duct and the outer periphery of the edge of the holder. By providing a portion that fits between the peripheral edge of the exit side opening of the case and the edge of the holder seated therein, and sandwiching the portion between the peripheral edge of the case and the edge of the holder, the holder can be An air filter characterized in that an inlet side end of the duct is fixed to the edge to form a holder and duct assembly, and the outlet side opening is closed by the assembly.