JPH0113811Y2 - - Google Patents

Description

[Detailed description of the invention] A. Field of industrial application The present invention relates to an air cleaner for internal combustion engines.

B. Prior Art An air purifier for an internal combustion engine that has been used in the past, for example, as shown in FIG. There is.

C. Problems that the invention aims to solve By the way, vibrations from the internal combustion engine propagate to air cleaners for internal combustion engines, and are emitted from the air cleaner as noise such as transmitted sound and membrane vibration noise. The wall thickness of the case 6 and cap 8 of air cleaners has been reduced for the purpose of weight reduction, and as a result, their rigidity has been reduced. As a result, the noise level emitted from air purifiers is increasing.

D. Means for solving the problem According to the present invention, the above problem can be solved by housing the annular filter body in the center of the case where air is introduced from the tangential direction to the inner surface of the cylindrical case peripheral wall, and capping the case. In the air cleaner for an internal combustion engine covered with It is resolved accordingly.

E. Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Fig. 1 shows an embodiment of the air purifier for internal combustion engines according to the present invention, and Fig. 3 is a sectional view taken from the direction A-A in Fig. 3. 1 and 2C are detailed views showing a modification of the reinforcing convex portion of the embodiment shown in FIG. 1, and FIG. 3 is a partially sectional front view of the embodiment shown in FIG. In the figure, 2 generally indicates an air cleaner for an internal combustion engine.
The device includes a cylindrical case 6 that houses an annular filter 4 and a cap 8 that covers the case 6.
As disclosed in Utility Model Application Publication No. 56-43459,
The cap 8 may be provided with uneven portions or ribs. 10
A is a nine reinforcing convex part provided on the inner surface of the circumferential wall of the case 6 that extends in the axial direction and projects inward in the radial direction, and is formed by a bent part provided on the inner surface of the circumferential wall of the case 6. . The cross-sectional shape of this reinforcing convex portion 10A is shown as a triangular shape with an apex angle of 90° in FIGS. It may be a round shape or a substantially semicircular shape as shown in FIG. 2C.

A gasket 12 made of an elastic material or the like is interposed between the filter body 4 and the case 6 and cap 8, and is fixed to the case 6 and cap 8. A gasket 14 is interposed between the case 6 and the cap 8. Intervening. Reference numeral 16 denotes a tightening fitting fixed to the outer surface of the case 6. This tightening fitting 16 tightens the gasket 14 portion to maintain airtightness between the case 6 and the cap 8, and also secures the filter body 4 to the case 6.
and cap 8. An inlet 18 is provided on the peripheral wall of the case 6, and an outlet 20 is provided radially inward of the position where the gasket 12 of the cap 8 is fixed.

The flow of air inside the air cleaner for an internal combustion engine configured as described above is indicated by arrows in FIGS. 1 and 3.
When the outlet 20 is connected to the intake port (not shown) of the internal combustion engine and the engine is operated, the air supplied to the internal combustion engine is passed through the filter body in the air purifier 2 from the tangential direction to the inner surface of the peripheral wall of the case 6 through the inlet 18. It is inhaled between case 4 and case 6. The inhaled air flows along the annular space defined by the filter body 4 and the case 6, during which it collides with each reinforcing convex portion 10A, and part of the dust is removed by inertial collision. While being effectively removed from the air flow, the air flow is drawn into the filter body 4 substantially uniformly from the entire circumference of the filter body 4 and into the internal combustion engine via the outlet 20. In conventional air purifiers for internal combustion engines, most of the air drawn from the inlet was drawn into the filter near the inlet, resulting in uneven air flow.However, the structure of the present invention Since the air purifier is provided with the reinforcing convex portion 10A, the air flow is made uniform as described above, thereby reducing the intake air resistance that the filter body 4 receives, and further reducing the amount of dust retained in the filter body 4. This has the effect of increasing.

FIG. 4, FIG. 5, and FIG. 6 are diagrams showing the results of a noise test, an intake air resistance test, and a dust retention test conducted to explain the effects of the present invention. The noise test was conducted by arranging the air purifier as shown in Figure 7 and measuring the sound pressure level for each frequency.
Intake air resistance test and dust retention test
In accordance with JISD 1612, the intake air resistance and dust retention amount were measured for each amount of intake air and for each increase in intake air resistance. In FIG. 7, 22 is a soundproof room, 24 is a microphone, and 26 and 28 are ducts. The specifications of the air purifier according to this example used in these tests were as follows: outer diameter 180.6 mm, height 171.6 mm, reinforcing convex portion 10A has a triangular cross section as shown in Figure 2A, and length in the axial direction. 130 mm, the height of the triangular convex portion is 5 mm, and the gap between the filter body 4 and the case 6 is 15 mm in the portion without the reinforcing convex portion 10A. In Figures 4 to 6, the test results of this embodiment with the above specifications are shown by solid lines, and the test results of the conventional example with the same specifications except that there is no reinforcing convex part are shown by dashed lines. .

As is clear from the figure, compared to the conventional example, the air purifier of this example has a sound pressure level that is lower throughout the measurement frequency range, an intake air resistance that is approximately 20% lower, and a dust retention amount that is approximately It increased by 20%.

FIG. 8 is a sectional plan view of another embodiment of the air cleaner for an internal combustion engine according to the present invention. In the embodiment shown in FIGS. 1 to 3, nine reinforcing convex portions 10A are formed by the bent portions on the inner surface of the peripheral wall of the case 6, but in the embodiment shown in FIG. is fixed to the inner surface of the circumferential wall of the case 6 so as to extend in the axial direction to form nine reinforcing convex portions 10B.
has been formed. The cross-sectional shape of this rod-shaped member is not limited to a triangular shape, but may be a semicircular shape or the like.

In addition, in the above-mentioned two embodiments, an example was shown in which nine reinforcing convex portions 10A and 10B were provided, but the number is not limited to this, and the same effect can be obtained even if, for example, six reinforcing convex portions are provided. be able to.

F. Effects of the invention As described above, according to the invention, a plurality of reinforcing convex portions are provided on the inner surface of the peripheral wall of the case of an internal combustion engine air cleaner to increase the rigidity of the case.
This has the effect of suppressing the vibration of the case due to the propagation of vibrations from the internal combustion engine, and reducing the noise level emitted from the air purifier. Also,
Air drawn into the air purifier from the tangential direction to the inner surface of the cylindrical peripheral wall flows along the annular space defined by the filter and the case, and collides with each reinforcing convex part during that time. A part of the dust is effectively removed from the airflow by inertial collision, and the airflow is sucked in almost uniformly from the entire outer circumference of the filter, resulting in a reduction in the intake air resistance due to the filter, Furthermore, the amount of dust retained within the filter increases. The effect of providing reinforcing convex portions on the inner surface of the circumferential wall of the cylindrical case is significant; the airflow, which tends to flow smoothly along the inner surface of the circumferential wall, collides with the reinforcing convex portions that are present at various locations in the circumferential direction. By changing direction and moving toward the center of the case, the entire filter body contributes equally to dust removal.

[Brief explanation of the drawing]

Figure 1 shows an embodiment of the air purifier for internal combustion engines according to the present invention, and is a sectional view taken from the direction A-A in Figure 3. Figure 2A is a detailed view of section B in Figure 1.
Figures B and 2C are detailed views showing modified examples of the cross-sectional shape of the reinforcing convex portion of the embodiment shown in Figure 1;
The figure is a partially sectional front view of the embodiment shown in Figure 1, Figures 4, 5 and 6 are diagrams showing the results of tests regarding the effects of the present invention, and Figure 7 is a diagram showing the results of the tests shown in Figure 4. Figure 8 is a plan sectional view of another embodiment of the air cleaner for internal combustion engines according to the present invention, and Figure 9 is a partial cross-section of an example of the conventional air cleaner for internal combustion engines. It is a front view. 2... Air purifier for internal combustion engine, 4... Filter body,
6...Case, 8...Cap, 10A, 10B
...Reinforcing convex part.

Claims (1)

[Claims for Utility Model Registration] (1) An air cleaner for internal combustion engines in which an annular filter is housed in the center of the case into which air is introduced from the tangential direction to the inner surface of the peripheral wall of the cylindrical case, and the case is covered with a cap. An air cleaner for an internal combustion engine, characterized in that a plurality of reinforcing convex portions extending in the axial direction and projecting inward in the radial direction are provided on the inner surface of the peripheral wall of the case. (2) Utility Model Registration The air cleaner for an internal combustion engine according to claim 1, characterized in that the reinforcing convex portion is formed by a bent portion provided on the inner surface of the peripheral wall of the case. Air purifier for internal combustion engines. (3) Utility Model Registration Scope of Claim 1 In the air cleaner for an internal combustion engine, the reinforcing convex portion is formed of a lattice-shaped member fixed to the inner surface of the peripheral wall of the case. Air purifier for internal combustion engines.