JPS6228691Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a tightening mechanism for an air cleaner case and a cap, and more particularly to a tightening mechanism for an air cleaner case and a cap for an internal combustion engine equipped with a resin case.

Conventionally, as a tightening mechanism for the case and cap of an air cleaner for an internal combustion engine, the one shown in FIGS. 1 and 2 has generally been used.

The tightening mechanism shown in the figure is the filter element 1
The case 12 and the cap 14 are fixed to each other by a plate-shaped steel clip 16.

A flange 20 is attached to the side wall 18 of the case 12, which has holes drilled in several places and is secured with screws.The flange 20 has a through hole 22 formed in the substantially center thereof and protrudes outward. A pair of ears 2
4 are integrally formed.

A cylindrical portion 26 is attached to one end of the clip 16.
is formed, and a cap 14 is formed at the other end.
A crimping surface 30 is formed which engages the outer peripheral portion 28 of. The tightening mechanism having such a structure is constructed by connecting the through hole 22 of the ear portion 24 of the flange 20 and the clip 16.
Insert the pin 32 that passes through the cylindrical part of the pin 32.
It is attached by caulking the ends of the

However, the above-described tightening mechanism has the following drawbacks.

That is, in order to attach the clip 16, not only the pin 32 is required, but also the work of crimping the end of the pin 32 is required, which has the drawback of increasing production costs due to an increase in the number of component parts and the number of assembly steps. Ta.

This idea was devised in view of these conventional problems, and its purpose is to create a relatively simple tightening mechanism for the air cleaner case and camp of an internal combustion engine, and to reduce the number of parts.・
This makes it possible to reduce assembly man-hours.

Hereinafter, preferred embodiments of this invention will be described with reference to the accompanying drawings.

In the following description, parts that are the same as or correspond to those of the conventional example described above are given the same reference numerals.

3 and 4 show an embodiment of the air cleaner case and cap tightening mechanism according to this invention.

The tightening mechanism shown in the figure is the filter element 1
0, it is equipped with a resin case 12, a cap 14, and a metal clip 16, and one end of the clip 16 is formed with a crimp surface 30 that engages with the cap 14 and is crimped to the case 12.
An elastic curved portion 40 is formed at the other end.

On the side wall 18 of the case 12, a pair of vertically extending vertical walls 42, 42' are formed in parallel and spaced apart from each other at approximately the same distance as the width of the clip 16. A corrugated portion 44 having an inclined surface that descends and gradually protrudes forward, and whose rear end is curved inward in a substantially semicircular shape, is provided approximately at the center of the vertical walls 42, 4.
2' and a corrugated portion 44.
is formed integrally with the case 12.

Further, the rear ends of the vertical walls 42, 42' are provided with convex portions 48, 48', which protrude toward each other and have a cross-sectional shape curved inwardly into a substantially semicircular shape. The rear end of the wave-shaped portion 44 and the convex portions 48, 48' of the vertical walls 42, 42' define a space 50 having an inverted Ω-shaped cross section, and an entrance to the space 50 having an inverted Ω-shaped cross section. The side length (l ₁ ) is the diameter (l ₂ ) of the arcuate part of the arcuate bent part 40 of the clip 16 and the length (l ₃ ) of the free end 52 of the arcuate bent part 40 of the clip 16. ), which makes the arcuate bend 4 of the clip 16 smaller.
When the clip 16 is elastically deformed and press-fitted into the space 50 having an inverted Ω cross section, the clip 16 is prevented from falling off from the receiving member 46, and can freely rotate in the vertical direction between the receiving members 46. ing.

Therefore, the cap 14 is placed on the case 12, and the crimp surface 30 of the clip 16 is placed on the cap 1.
An outer peripheral portion 28 protruding upward provided at the side end of 4
The cap 14 and the case 12 can be fixed by allowing the cap 14 to cross over the cap 14 and the case 12.

Note that 54 in the figure is a gasket for maintaining the inside of the case 12 airtight when the cap 14 is closed and fixed as described above.

As described above, the air cleaner case and cap tightening mechanism of this invention includes a pair of vertical walls separated by a width approximately equal to the clip width, and a corrugated portion formed approximately at the center of the vertical walls. Convex portions protruding close to each other on the inside of the rear end and each having a cross-sectional shape curved inward in a substantially semicircular shape are provided, and the rear end of the wavy portion and the convex portion are connected to the side of the case. A receiving member defining a space portion having an inverted Ω-shaped cross section into which the bent portion of the clip is rotatably fitted is integrally formed with the case, and the entrance of the space portion is formed with a diameter smaller than that of the arc-shaped bent portion. The arc-shaped bent portion of the clip is elastically deformed and press-fitted into the space, the engaging surface of the clip is latched onto the cap, and this is tightened and fixed onto the case. This makes it easy to attach the clip and reliably prevents it from falling out. Also, the receiving member can be integrally molded at the same time as the case, and the case and cap can be connected without using pins as in the past. can be tightened, making it possible to reduce the number of parts and installation man-hours.

[Brief explanation of the drawing]

1 and 2 show an example of a conventional tightening mechanism, with FIG. 1 being a perspective view and FIG. 2 being a cross-sectional view taken along the line A--A in FIG. 1. Figures 3 and 4 show an embodiment of the air cleaner case and cap tightening mechanism according to this invention.
The figure is a perspective view, and FIG. 4 is a sectional view taken along the line BB in FIG. 3. 10...Filter element, 12...Case, 14...Cap, 16...Clip, 18
... side wall, 20 ... flange, 26 ... cylindrical part,
32...Pin, 40...Circular bending part, 42,4
2'... Vertical wall, 44... Corrugated portion, 46... Receiving member, 50... Space portion having an inverted Ω shape in cross section.

Claims (1)

[Scope of utility model registration request] In order to fix a cap to a resin air cleaner case, a tightening mechanism is provided with a plate-like clip of the same width, which has a surface that engages with the cap at one end and an elastic arc-shaped bent part at the other end. , comprising a pair of vertical walls separated by a width substantially equal to the width of the clip, and a corrugated portion formed approximately in the center of the vertical walls, protruding close to each other inside the rear ends of the vertical walls, and having a cross-sectional shape. A convex portion curved inwardly into a substantially semicircular shape is provided, and the bent portion of the clip is rotatably fitted loosely into the side of the case between the rear end of the corrugated portion and the convex portion. A receiving member defining a shaped space is integrally formed with the case, an entrance of the space has a smaller diameter than the arc-shaped bent part, and the arc-shaped bent part is elastically deformed into the space. A tightening mechanism for an air cleaner case and a cap, characterized in that the clip is press-fitted, the engaging surface of the clip is latched onto the cap, and the clip is tightened and fixed onto the case.