JPH0245504Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an air cleaner with a resonator installed in an internal combustion engine.

[Conventional technology]

As a countermeasure against noise on the intake side of an internal combustion engine, there is a system in which a cavity is integrally provided in the air cleaner and communicated with the air intake passage through a communication hole to form a resonator, which was disclosed in Utility Model Application No. 57-89857. There is an example like this. In the conventional air cleaner with resonator 31 shown in FIG. 3, an annular air passage 33 is provided around an annular cylindrical element 32, and a resonator 35 is attached to the annular air passage 33, so that the casing 34 has an empty space that becomes a resonance chamber 36. It has an outer shape that protrudes in one direction from the cylindrical part.

[Problem that the invention attempts to solve]

Conventional air cleaners with resonators, such as those mentioned above, have protruding parts that make the outer shape unbalanced with respect to the center, which causes strong vibration stress to be applied to the air cleaner, making it necessary to make the casing and its fixing means strong. . Moreover, such a one-sided protrusion may cause problems in terms of layout when installed in an engine room with limited space.

[Means for solving problems]

This idea is intended to solve the above problem. That is, a body and a cover are removably connected at their respective peripheries to form a substantially quadrilateral box-shaped casing, and an annular filter element is arranged around an air outlet hole provided in the body. A cylindrical inner wall is provided on the inner surface of the cover so that an air passage is formed in an annular shape, and the inner wall divides the inside of the casing into the air passage and a substantially triangular cavity formed at the four corners of the casing. The air cleaner is equipped with a resonator, in which the air passage is communicated with the atmosphere through an inlet pipe attached to the casing, and a communication hole is provided in the inner wall to communicate the air passage with the cavity to form a resonator.

[Effect]

The air cleaner with a resonator of this invention sucks air from the inlet pipe, passes through the annular air passage, passes the intake air through the filter element, and discharges it from the air outlet hole, which is the same as a conventional air cleaner, and is integrated into the case. It is also the same as the conventional type that the noise on the intake side is reduced by the provided resonators, but since such resonators are provided at positions almost opposite to the four corners of the casing, which is approximately rectangular box-shaped, the casing has a quadrilateral shape that is almost symmetrical with respect to the center and has no unbalanced protrusions. Therefore, when this air cleaner is installed in an internal combustion engine, there are few problems with the vibration characteristics of the air cleaner itself, and the means for fixing it may be simple. Also, since there are no unevenly protruding parts, it is convenient for the layout in the engine room.

Change the shape and volume of each cavity by changing the inner wall thickness of each cavity formed at the four corners of the quadrilateral box-shaped casing, or connect each cavity with an air passage. By making the cross-sectional areas of the holes different from each other, the frequencies at which each cavity resonates can be made different, thereby achieving a silencing effect on noise of various frequencies.

〔Example〕

An example of this invention will be described. The air cleaner 1 shown in FIGS. 1 and 2 has a substantially rectangular shape with side walls 2a on all sides, and a casing 4 is formed by combining a box-shaped cover 2 with an open bottom surface and a body 3 having substantially the same outline at the periphery. An air outlet hole 5 is provided in the center of the body 3, and an annular over-element 6 is disposed around the air outlet hole 5, and is tightened with a center bolt 7. The filter element 6 may be of the shape of a cap covering the air outlet port 5 as shown in FIG. 2, or may be of an annular cylindrical shape and sealed by abutting the upper end against the inner surface of the cover.

An inlet pipe 8 is attached to the side surface of the casing 4, in which an upper pipe piece 8b with a negative pressure motor 8a and a lower pipe piece 8d with a warm air opening/closing valve 8c connected to the negative pressure motor 8a are engaged. It will be done. Further, a pipe cover 8e that covers the upper surface of the inlet pipe 8 is formed integrally with the cover 2.

A cylindrical inner wall 10 is integrally formed to hang down from the upper inner surface of the cover 2 so as to define an annular air passage 9 communicating with the inlet pipe 8 around the air filter element 6. side wall 2a
The lower end reaches the inner surface of the cover 3. The interior of the casing 4 is divided by an inner wall 10 into an annular air passage 9 and four approximately triangular cavities 11 at the four corners of the casing outside the inner wall. A communicating hole 12 is bored. Bolt holes and bolt seats are provided at corresponding locations at the four corners of the cover 2 and the body 3, and the body 2 and the cover 3 are fixed by tightening with tightening bolts 13.

The above-mentioned cavity 11 and communication hole 12 act as a resonator with the cavity 11 as a resonance chamber when air enters the filter element 6 from the inlet pipe 8 through the annular air passage 9, and has a silencing effect on the suction side. do. Furthermore, by changing the volume and shape of each cavity or the cross-sectional area of the communication hole when molding the cover, it is possible to change the resonance frequency of each chamber and widen the range of sound to be silenced.

〔effect〕

The air cleaner with a resonator of this invention has a casing shape that is almost a quadrilateral box, and the resonator chamber of the attached resonator does not protrude unilaterally from the casing, making it a well-balanced shape in terms of vibration characteristics. No unreasonable vibration stress occurs. Also, the means for fixing the air cleaner becomes simple. Furthermore, it is not difficult to install an air cleaner in places where space is limited, such as the engine compartment of a car, due to the layout.

[Brief explanation of the drawing]

FIG. 1 is a plan sectional view of an embodiment of this invention. Second
The figure is a side sectional view thereof. FIG. 3 is a sectional view of a conventional air cleaner with resonator. 2... Cover, 3... Body, 6... Excess element, 10... Inner wall, 11... Vacant room, 12...
Communication hole.

Claims (1)

[Scope of utility model registration request] A body with an air outlet hole on the bottom and a cover whose periphery is removably connected to the body form a nearly quadrilateral box-shaped casing, with an annular shape around the air outlet hole provided in the casing. A filter element is disposed, and a cylindrical inner wall is provided that surrounds the outer circumference of the filter element at intervals, so that the inside of the casing has an annular air passage around the filter element and a substantially triangular air passage formed at each of the four corners of the casing. dividing the chamber into a vacant space, and installing an inlet pipe communicating with the air passage in the casing,
An air cleaner with a resonator, comprising a resonator having a communication hole in an inner wall that communicates the cavity with the air passage, and using the cavity as a resonance chamber.