JPS5918149Y2 - Internal combustion engine intake silencer - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an improvement in an intake silencer for an internal combustion engine.

Intake silencers installed at the intake pipe inlet of internal combustion engines are used to prevent the noise generated during intake of conventional internal combustion engines and the inflow of dust in the air. As engine operation increases, the engine loses work during suction due to the resistance in the intake cylinder passage, and the real volumetric efficiency deteriorates significantly.

Therefore, there is a disadvantage that the greater the resistance of the intake silencer, the lower the fuel consumption rate and shaft output of the engine.

That is, in the intake silencer, when the intake flow passes through the silencer, there are many places where the intake flow changes direction by 180 degrees, and local vortices occur at the places where the direction changes, causing passage resistance. There is a disadvantage that the amount of intake air flowing into the combustion chamber of the internal combustion engine is reduced because of the increase in the amount of air.

This has a particularly large effect on high-speed internal combustion engines.

To address the above-mentioned drawbacks, there are some models in which the 180° direction change point of the intake air flow in the intake silencer is made of sheet metal and subjected to vereding processing to create a smooth shape, but in this case, the processing cost is high, and the intake There are disadvantages such as increased production cost of the silencer and troublesome cleaning of the vereding area.

Therefore, the present invention aims to eliminate the above-mentioned conventional drawbacks.

That is, in the present invention, an intermediate cylinder is disposed in a double cylinder container concentrically with the double cylinder container, a through hole is bored in the bottom of the intermediate cylinder, and the intermediate cylinder and the double cylinder are connected. An intake silencer, which has a through-hole formed in a partition provided between the double-cylindrical container and the inner cylinder, and a lid having a larger diameter than the double-cylindrical container is fixed to the double-cylindrical container, OI is applied to the end of the outer cylinder in the double cylinder container, the through hole provided in the bottom of the intermediate cylinder, and the through hole provided in the partition part.
It is characterized by a J-shaped band.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a partially sectional front view of a conventional oil bath type intake silencer, and FIG. 2 is a partially sectional front view of an oil bath type intake silencer according to an embodiment of the present invention.

First, in FIG. 1, in the conventional oil bath type intake silencer 1, intake air is taken in from the intake port 2 as shown by the arrow F, and the direction is changed by 180 degrees along the intake flow A.
It is collided with the oil surface 3 at the bottom, and only the dust 1 ~ is adsorbed and separated in the oil by the inertia of the duct in the intake air, and then the direction is changed by 180 degrees through which the intake flow B passes, and then it is further changed to the direction of the intake flow C. It is turned around by 180 degrees, descends through the center of the intake silencer 1, and is sent to the combustion chamber of the internal combustion engine via the intake pipe.

In other words, as is clear from FIG. A through hole 14 is bored in the bottom, a through hole 16 is bored in the partition 15 provided between the intermediate tube 13 and the inner tube 11 of the double cylindrical container 10, and the double cylindrical container 10, the double cylindrical container 10
It has a structure in which a lid 17 with a larger diameter is fixed.

The intake flow that changes the direction of the intake air by 180°, A,
Local vortices E are generated at each location B and C, causing passage resistance.

Next, to explain the oil bath type intake silencer 1 according to the embodiment of the present invention shown in Fig. 2, the same parts as the conventional oil bath type intake silencer 1 shown in Fig. 1 are indicated by the same part numbers. The difference is that, depending on the purpose of use of the internal combustion engine, a contractible circle made of rubber or resin is used so that the part where the intake air changes direction by 180 degrees in the intake silencer 1 has a smooth shape. The shape material, that is, in this embodiment, OIJ ring-shaped bands 4, 4', 4'' are inserted and attached as shown in the figure.

More specifically, as is clear from FIG. 2, an O-ring-shaped band 4 is installed at the end of the outer cylinder 12 of the double-cylindrical container 10, and a through hole is provided at the bottom of the intermediate cylinder 13. An O-ring-shaped band 4' is installed at 14, and an OIJ ring-shaped band 4'' is installed at the through hole 16 provided in the partition part 15.

As mentioned above, in the present invention, the intermediate cylinder 13 is arranged concentrically with the double cylindrical container 10 inside the double cylindrical container 10, and the through hole 14 is bored in the bottom of the intermediate cylinder 13. A through hole 16 is bored in the partition portion 15 provided between the intermediate cylinder 13 and the inner cylinder 11 of the double cylindrical container 10, and the double cylindrical container 10 is provided with a through hole 16. This intake silencer has a large-diameter lid 17 fixed thereon, and includes a through hole 14 provided at the end of the outer tube 12 of the double cylindrical container 10, a through hole 14 provided at the bottom of the intermediate tube 13, and a through hole provided at the partition portion. O-ring-shaped band 4.4' at 16,
4", it is possible to prevent the generation of vortices at the point where the intake air turns 180 degrees, and it is possible to reduce the manufacturing cost by eliminating the need for expensive processing such as vertiling processing.

Furthermore, since the O-ring-shaped bands 4, 4', 4'' are removable, cleaning of the locations where the bands 4, 4', 4'' are attached becomes easy.

Furthermore, the present invention also applies to conventional types of intake silencers.
It has the advantage that it can be applied easily and at low cost.

That is, the present invention uses a low cost I· intake silencer as a standard, and can also be used for a high flow rate characteristic intake silencer depending on the intended use, so it has the advantage of being applicable over a wide range of applications.

Note that the present invention is effective for intake silencers for internal combustion engines, compressors, and the like.

[Brief explanation of drawings]

FIG. 1 is a partially sectional front view of a conventional oil bath type intake silencer, and FIG. 2 is a partially sectional front view of an oil bath type intake silencer according to an embodiment of the present invention.

Claims (1)

[Scope of utility model registration request] An intermediate cylinder 13 is arranged in the double cylinder container 10 concentrically with the double cylinder container 10, and a through hole 14 is bored in the bottom of the intermediate cylinder 13, so that the intermediate cylinder 13 and the double cylinder A through hole 16 was bored in the partition 15 provided between the cylindrical container 10 and the inner cylinder 11, and a lid 17 having a larger diameter than the double cylindrical container 10 was fixed to the double cylindrical container 10. The intake silencer has an O'J ring shape in the end of the outer cylinder 12 of the double cylindrical container 10, the through hole 14 provided in the bottom of the intermediate cylinder 13, and the through hole 16 provided in the partition part. An intake silencer for an internal combustion engine, characterized in that bands 4, 4', and 4'' are installed.