JPH0324868Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention is related to engine air cleaners, and eliminates the problem of installing a blocking plate installed in the clean air chamber to prevent oil from blowing back. This prevents air from entering the clean air chamber through the outer periphery of the filter paper element.

<Prior Art> Engine air cleaners have conventionally had a structure as shown in FIGS. 5 and 6, for example.
That is, the lid 3 is removably attached to the open end 2 of the air cleaner main body 1, a stepped portion 9 having a seating surface 8 facing toward the open end 2 is formed on the inner circumferential surface 7 of the main body 1, and this seating surface 8 is made of elastic material. The collar 5a of the filter paper element 5 is seated through a gasket 4 made of a deformable material, and the filter paper element 5 divides the inside of the main body 1 into an outside air communication chamber 10 and a clean air chamber 11. The clean air outlet 13 is deviated and opened, and an oil blowback shielding plate 6 is provided between the clean air outlet 13 and the filter paper element 5 in the clean air chamber 11. A positioning groove 15 is formed running from the seating surface 8 toward the rear end wall 12 side, and the positioning protrusion 16 of the oil blowback shielding plate 6 is engaged with the positioning groove 15.

<Problems to be solved by the invention> By the way, if the clean air outlet 13 communicating with the mixer C of the engine E is connected to the rear end wall 1 as shown in FIG.
2, if the oil blowback shielding plate 6 is incorrectly assembled upside down or inside out, the blocking part 6a of the shielding plate 6 will close to the clean air outlet 13. If it is out of position, it is impossible to prevent oil from blowing back.

Therefore, conventionally, a positioning groove 15 is formed in the inner circumferential surface 7 of the air cleaner body 1 by running from the seating surface 8 of the stepped portion 9 toward the rear end side, and the oil blowback shielding plate 6 is provided with a positioning groove 15 in the positioning groove 15. A positioning protrusion 16 is formed at the engaging position, and the shielding plate 6 is configured to avoid mounting errors.

However, in this case, as shown in FIG. 6, the width of the seating surface 8 of the stepped portion 9 of the gasket 4 is narrowed by the portion where the positioning groove 15 is formed.
Therefore, the sealing performance in this area is impaired, and the performance of the air cleaner is eventually reduced.

<Means for Solving the Problems> Therefore, in order to solve the above-mentioned problems, in the present invention, as shown in FIGS. 1 to 4, the gasket 4 made of an elastically deformable material has a protruding outer peripheral surface. formed into
The protruding portion 4a is pressed against the inner circumferential surface portion 7a of the stepped portion 9 of the main body 1 on the open end 2 side, thereby forming a gap 19 for generating an intermediate differential pressure at the inner corner of the stepped portion 9. It is characterized by:

<Function> The protruding portion 4a of the gasket 4 is connected to the stepped portion 9 of the main body 1.
By pressing against the inner circumferential surface portion 7a on the open end 2 side of A gap 19 having an intermediate negative pressure is formed. When the dust in the outside air communication chamber 10 attempts to enter the clean air chamber 11 through the outer periphery of the filter paper element 5, the pressure difference between the outside air communication chamber 10 and the clean air chamber 11 is greater than the pressure difference between the outside air communication chamber 10 and the clean air chamber 11. Since the differential pressure between the gap 19 and the gap 19 is small, the intrusion of dust into the gap 19 is reduced accordingly, and the differential pressure between the gap 19 and the clean air chamber 11 is also small, so dust can enter the gap 19. The collected dust does not enter into the clean air chamber 11. In other words, due to the presence of this gap 19, the differential pressure between the outside air communication chamber 10 and the clean air chamber 11 along the inner circumferential surface portion 7a of the stepped portion 9 is divided, and the sealing performance of the gasket 4 is improved. improves.

<Example> Hereinafter, the characteristic structure of the present invention will be explained based on the drawings.

FIG. 4 is a front view showing an aspect in which an oil blowback shielding plate is attached to the main body of the air cleaner according to the present invention, and FIG. 3 is a sectional view of the air cleaner.
It is a sectional view taken along the arrows at a position corresponding to the - line in the figure.

In these figures, reference numeral 1 denotes an air cleaner body, 3 a lid 4 detachably attached to the open end 2, a gasket, 5 a filter paper element, and 6 an oil blowback shielding plate.

The air cleaner main body 1 is formed in a rectangular shape, and a stepped portion 9 having a seating surface 8 on the open end 2 side is formed on the inner peripheral surface 7 of the main body 1, and a gasket 4 made of an elastically deformable material is attached to the seating surface 8. Through the filter paper element 5
The interior of the main body 1 is divided into an outside air communication chamber 10 and a clean air chamber 11.

A clean air outlet 13 communicating with the mixer C of the engine E is opened in the back end wall 12 of the clean air chamber 11 at a position offset from the center position of the back end wall 12, and a clean air outlet 13 is opened at the corner of the back end wall 12. A blazer gas inlet 14 communicating with the blazer device L is opened.

a position offset from the center of the left inner circumferential surface 7 of the main body 1;
That is, as shown in FIG. 4, a positioning groove 15 is formed from the seating surface 8 of the stepped portion 9 toward the inside of the clean air chamber 11 at a position deviated toward the clean air outlet 13 side.
On the other hand, the oil blowback shielding plate 6 is formed with a positioning protrusion 16 at a position corresponding to the positioning groove 15.
If the shielding plate 6 is attached by engaging the
Since the shielding portion corresponds to 3, the structure prevents the shielding plate 6 from being attached incorrectly.

A protrusion 17 is formed on the inner circumferential edge of the seating surface 8 of the stepped portion 9 except for the positioning groove 15, and when the lid 3 presses the brim 5a of the filter paper element 5, the pressure applied to the gasket 4 is applied. It is configured to be restricted by this protrusion 17.

The cross-sectional shape of the gasket 4 is, for example, as shown in FIG. 2A or B, and the outer peripheral surface is formed into a deformable protruding shape, and as shown in FIG. The protruding portion 4a or 4b is brought into pressure contact with the inner circumferential surface portion 7a, and a gap 19 is formed at the inner corner of the stepped portion 9. During engine work, the air pressure in this gap 19 becomes an intermediate negative pressure between the air pressure (atmospheric pressure) in the outside air communication chamber 10 and the intake negative pressure in the clean air chamber 11.
It has a function of dividing the pressure difference between the outside air communication chamber 10 and the clean air chamber 11 along the side. This improves the sealing performance of the gasket ring 4 and, as a result, effectively prevents dust from entering the clean air chamber 11 from the outside air communication chamber 10. That is, the width of the seating surface 8 of the stepped portion 9 is narrowed in the portion where the positioning groove 15 is formed, and the sealing performance of the gasket 4 is reduced by improving the shape of the gasket 4 as described above. It is possible to compensate for this and further improve the sealing performance.

In the above embodiment, the air cleaner main body is formed into a rectangular shape and has one positioning groove, but the present invention is not limited to this. For example, if the air cleaner main body is cylindrical, three key grooves may be arranged at irregular intervals. The present invention can also be applied to the case where the shielding plate is formed to prevent mounting errors of the shielding plate.

<Effects of the invention> According to the invention, since it is constructed and operates as described above, in order to eliminate mistakes in installing the oil blowback shielding plate, even if the sealing width of the gasket becomes narrow at the location of the positioning groove, By forming a gap for generating an intermediate differential pressure by air-tight contact of the protrusions on the outer circumferential surface of the gasket, the differential pressure between the outside air communication chamber and the clean air chamber is divided in the gap, and dust is communicated with the outside air. It is possible to prevent the air from entering the room into the gap and from entering the clean air room.

[Brief explanation of the drawing]

1 to 4 show embodiments of the present invention.
The figure is an enlarged view of part I in Fig. 3, Fig. 2 A and B are sectional views of the gasket ring, Fig. 3 is an arrow sectional view corresponding to the - line in Fig. 4, and Fig. 4 is a cross-sectional view of the gasket ring. FIG. 5 is a front view showing a state in which an oil blowback shielding plate is attached to the air cleaner body, FIG. 5 is a side sectional view showing a conventional example, and FIG. 6 is an enlarged view of essential parts showing a state in which a gasket ring is attached to the conventional example. 1... Air cleaner body, 2... Opening end, 3...
...Lid, 4...Gasket, 4a...Protrusion, 5...
...Filter paper element, 5a...Brim, 6...Oil blowback shielding plate, 7...Inner circumferential surface, 7a...Inner circumferential surface, 8...Seating surface, 9...Step portion, 10...Outside air communication chamber , 11... Purification room, 12... Back end wall, 13
... Clean air outlet, 15 ... Positioning groove, 16 ... Positioning protrusion, 19 ... Gap.

Claims (1)

[Claims for Utility Model Registration] A lid 3 is detachably attached to the open end 2 of the air cleaner body 1, and a stepped portion 9 having a seating surface 8 facing toward the open end 2 is formed on the inner circumferential surface 7 of the main body 1, The collar 5a of the filter paper element 5 is seated on this seating surface 8 via a gasket 4 made of an elastically deformable material, and the filter paper element 5 divides the inside of the main body 1 into an outside air communication chamber 10 and a clean air chamber 11. A clean air outlet 13 is deviated and opened in the rear end wall 12 of 11, and an oil blowback blocking plate 6 is provided between the clean air outlet 13 and the filter paper element 5 in the clean air chamber 11. The step portion 9
A positioning groove 15 is formed by running from the seating surface 8 toward the rear end wall 12 side, and the oil blowback shielding plate 6
In the engine air cleaner constructed by engaging the positioning protrusion 16 with the positioning groove 15, the gasket 4 made of an elastically deformable material has its outer peripheral surface formed into a protrusion, and the protrusion 4a is connected to the stepped portion of the main body 1. 9. An air cleaner for an engine, characterized in that the engine air cleaner is configured to press against an inner circumferential surface portion 7a on the open end 2 side of the step portion 9 to form a gap 19 for generating an intermediate differential pressure at the inner corner of the stepped portion 9.