JPS5933896Y2 - Air purifier cap for internal combustion engines - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cap that is attached to an air intake port of an air cleaner for an internal combustion engine to prevent rainwater from entering.

Conventionally, as this type of cap, as shown in FIG. 1, for example, an umbrella-shaped cap b is attached to a cylindrical body a constituting an air intake port of an air purifier (not shown), and an umbrella-shaped cap b is attached to an outer circumferential wall a' of the cylindrical body a, and a cap b is attached to the outer peripheral wall a' of the cylindrical body a. It is known to be mounted so as to form an air intake gap C between the inner circumferential wall b' at the lower end.

d is a coarse mesh that prevents large particles from entering.

With this structure, rainwater etc. can be drained from the cap b as shown by arrow A.
This prevents air from entering the cylinder a, and at the same time, air flows into the cap b through the gap C and into the cylinder a, as indicated by the arrow opening.

However, this structure has the problem that the noise generated inside the internal combustion engine directly propagates to the outside in the direction of the arrow in the opposite direction to the air flow, resulting in increased noise.

The present invention was developed in view of the above circumstances, and its purpose is to provide a cap for an air purifier for an internal combustion engine that can prevent the infiltration of rainwater, etc., and also prevent the noise generated inside the engine from directly propagating to the outside. It is to provide.

Embodiments of the present invention will be described below with reference to FIG. 2 and subsequent figures.

Reference numeral 1 denotes a cylindrical body, which forms an air intake port of an air cleaner communicating with the inside of the internal combustion engine.

An umbrella-shaped cap body 2 is disposed on the outer periphery of the cylinder 1 so as to form an annular gap 3 between the cylinder outer peripheral wall 1a and the lower inner peripheral wall 2a of the cap body.

The lower inner circumferential wall 2a of the cap body 2 and the outer circumferential wall 1 of the cylindrical body 1
A, a pair of partition walls 4 and 5 are fixedly installed with a gap in the vertical direction to form an air flow path A, and each partition wall 4.5 is folded in a waveform in the vertical direction. It has a curved shape, and sound absorbing materials 6 are provided on both upper and lower surfaces of the upper partition wall 4, the upper surface of the lower partition wall 5, and the inner surface of the cap 2, respectively.

Further, the inner peripheral edge 4a of the upper partition wall 4 is integrally connected to the mounting cylinder 7 that is fitted and fixed to the cylinder 1, and the outer peripheral side 4b is shaped like a smooth plate with slits 8 formed on the lower inner peripheral wall of the cap 2. It is fixedly installed in 2a.

Further, the outer circumferential edge 5a of the lower partition wall 5 is integrally connected to the lower inner circumferential wall 2a of the cap 2, and the inner circumferential portion 5b is shaped like a smooth plate and has many slits 9 cut therein, so that it is integrally connected to the mounting cylinder T. be.

As a result, rainwater or the like hits the cap body 2 as shown by arrow A and is prevented from penetrating into the cylindrical body 1.

Also, as shown by the arrow, air flows into the air passage A through the slit 9, that is, the air inlet, flows into the cap 2 B through the slit 8, and flows into the cylinder 1, passing through the air purifier and causing internal combustion. Supply inside the engine.

In addition, the noise generated inside the internal combustion engine propagates to the outside through the slit 9 via the inside B of the cylindrical body cap 2 and the inside of the air flow path A, as shown by the arrow.

At this time, since a sound absorbing material 6 is provided on the inside B1 of the cap, that is, on the inner wall of the cap 2 and on the upper surface of the upper partition wall 4, a part of the noise is absorbed by the sound absorbing material 6, and then a wave-shaped air flow path is formed. The noise flows into A and the density is repeatedly expanded and compressed, consuming energy, and a part of the noise is further absorbed by the sound absorbing materials 6, 6, and is later propagated to the outside, so it is propagated to the outside. The noise generated inside the internal combustion engine is significantly reduced, and the overall noise of the internal combustion engine can be reduced.

Furthermore, if the mounting cylinder 7 is removably fitted and attached to the cylinder 1, the cap can be easily removed and installed.

As described above, the present invention can prevent rainwater etc. from entering the air intake port 1, and the noise generated inside the internal combustion engine can be significantly reduced and propagated to the outside, thereby reducing the noise.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional example, and FIG. 2 is a sectional view showing an embodiment of the present invention. 1 is the air intake (cylindrical body), 2 is the cap body, 4.5
is a partition wall, 6 is a sound absorbing material, 7 is a mounting cylinder, 8°9 is an opening,
A is the air flow path, B is the inside of the cap.

Claims (1)

[Scope of utility model registration request] An umbrella-shaped cap body 2 is attached to the outer periphery of a mounting cylinder 7 that is attached to the air intake port 1 of the air purifier via a pair of wave-shaped partition walls 4 and 5 that form an air flow path A. An opening 9 for opening the air flow path A to the outside is formed on the inner circumferential side of the partition wall 5, and an opening 8 for opening the air flow path A into the interior B of the cap 2 is formed on the outer circumference side of the other partition wall 4. In addition, a sound absorbing material 6 is formed on the inner surface of the cap body 2, the inner surface of the pair of partition walls 4 and 5 facing the air flow path A, and the outer surface of one of the partition walls 4 facing the inside B of the cap 2. Air purifier cap for internal combustion engines.