JPS6014923Y2 - engine air cleaner - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an air cleaner attached to an engine.

In order to prevent intake noise such as the combustion explosion sound coming out of the combustion chamber and the sound generated by the intake air itself from the end of the engine's exhaust stroke to the beginning of the intake stroke, a resistance plate is installed inside the air cleaner, and a resistance plate is installed inside the cleaner case. Cushioning material may be attached to the

However, this resistance plate and cushioning material act as resistance to intake air, reducing the amount of intake air, resulting in a decrease in engine output and an increase in fuel consumption.

As described above, air cleaners have the contradictory problems of ensuring the amount of intake air and reducing intake noise, and various structures have been proposed to satisfy these issues.

In the one shown in FIG. 5, the intake pipe 32 is fixed to the peripheral wall of the cleaner case 31 to reduce intake noise.
There was a drawback that the intake air separated at the step-like connection part A in the figure, the intake air did not flow smoothly, and a sufficient amount of intake air could not be obtained.

In order to solve the above problems, this invention forms a cyclone-type dust removal chamber inside the cleaner case by eccentrically positioning the cleaner element inside the cleaner case, and the cross-sectional shape changes from a circular or oval shape to a square shape. By smoothly connecting the intake pipe formed in a gradually changing shape to the cleaner case so that the intake air flows tangentially into the cyclone type dust removal chamber, we aim to reduce intake noise, reduce intake resistance, and improve the intake air flow. This increases the flow rate and ensures a sufficient amount of intake air.

Examples of this invention will be described below based on the drawings.

FIG. 1 is a front view of the engine generator.

In this engine generator, a generator 2 is directly connected and fixed to the left side of a forced air-cooled electroplated engine 1, these are supported by a protection frame 3 for vibration isolation, and a fuel tank 4 is arranged above both 1 and 2. , Output terminal panel 5, muffler 6 on the front of the aircraft
, air cleaners 7 are arranged in order from the left.

The protective frame 3 has a pair of left and right gate-shaped side frames 3a.
and the grounding frame 3b that connects these lower parts to each other are bent in series to form the frame main body, and the penalty legs and rear legs of each side frame part 3a are connected by horizontal bars 3c, respectively. At the same time, a set base 8 for the engine 1 and a set base 9 for the generator are respectively mounted between the front and rear grounding frames 3b.

10 is a decorative board fixed to the front horizontal beam 3c.

The air cleaner 7, as shown in FIGS. 3 and 4,
A truncated conical cylindrical cleaner element 12 is arranged in a bottomed cylindrical cleaner case 11 in a state eccentric from the case center, and the cleaner case 11 is covered with an element positioning plate 13 and a bottom plate 14. The interior is divided into an inner clean air chamber 15 and an outer spiral-shaped cyclone type dust removal chamber 16 using an element 12, and a floating outlet 17 is provided in the bottom plate 14.

This air cleaner 7 is fixed to the engine 1 by fixing its bottom plate 14 to the carburetor 18 with bolts 19.

The element 12 is constructed by fixing a filter paper 20 and a shape-retaining cylinder 21 made of a perforated plate inscribed therein with a pair of front and rear ring-shaped end plates 22.

23 is a sponge attached to the outer periphery of the element.

A rectangular intake hole 24 is opened in the lower part of the peripheral wall of the cleaner case 11, and an intake cylinder 25 is continuous with the peripheral wall and extends downward along the tangent T to the peripheral surface of the cleaner case 11. .

The cross-section of the intake cylinder 25 gradually changes from a rectangular shape at the upper terminal end 25a to an elliptical shape at the lower starting end 25b.

In the above embodiment, the lower starting end 25b of the intake pipe 25 is shaped like an ellipse, but it may be shaped like a circle.

Next, the effect will be explained.

The intake air taken in from the intake port 26 at the lower end of the intake cylinder 25 is guided by the smoothly changing wall of the intake cylinder 25, enters the cyclone type dust removal chamber 16, and is removed by the sponge 23 and element '12. After passing through the clean air chamber 15, the cheating exit 1
7 to the vaporizer 18.

At this time, since the intake cylinder 25 is flush with the end wall of the cleaner case 11 and continues tangentially with the peripheral wall of the cleaner case 11, the intake air flows through the intake cylinder 25 with almost no resistance. The air enters the cyclone type dust removal chamber 16 without being separated, and a sufficient intake amount can be ensured.

Further, since the dust removal chamber 16 is a spiral cyclone and the intake resistance is small, the flow velocity of the intake air is increased, the intake air easily passes through the sponge 23 and the element 12, and dust is removed well.

Furthermore, the intake cylinder 25 extends from the lower starting end 25b to the upper terminating end 2.
Since the cross section gradually changes to widen towards 5a,
The passage for noise from the combustion chamber is narrower at the end, making it less likely that noise will be produced and providing good muffling.

Note that the sponge 23 outside the element 12 may not be provided.

Since this invention is structured and operates as described above, it produces the following effects.

(a) Since the intake pipe is continuous flush with the end wall of the cleaner case and tangentially connected to the peripheral wall of the cleaner case, ventilation resistance is small.

Thereby, the intake air flows smoothly and a sufficient amount of intake air can be ensured.

(b) In addition, the dust removal chamber inside the cleaner case is a cyclone type, and as shown in (a), the flow rate of intake air is high due to the low ventilation resistance, so coarse dust can be effectively removed by the cyclone type. , fine dust is removed well by the cleaner element, and the dust removal effect is enhanced.

(c) Furthermore, the cross-sectional shape of the intake pipe gradually changes from the circular lower end to the square upper end, and the cross-sectional area gradually increases from the lower end to the upper end. As the combustion explosion sound travels back through the airflow inside the intake cylinder, the cross-sectional area of the intake cylinder gradually decreases, and the change in the airflow caused by the change in the cross-section of the intake cylinder causes This prevents leakage from the lower starting end of the air cleaner, making it possible to create an air cleaner with less intake noise.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention; Fig. 1 is a front view of the engine generator, Fig. 2 is a vertical side view, and Fig. 3 is the same as Fig. 1.
FIG. 4 is a cross-sectional view taken along line IV--■ in FIG. 3, and FIG. 5 is a view corresponding to FIG. 4 showing a conventional example. 11...Cleaner case, 12...Cleaner element, 16...Cyclone dust removal chamber, 24...Intake hole, 25...Suction Cylinder, section, 25b...Lower starting end. 25a... Upper end

Claims (1)

[Scope of utility model registration request] A cleaner element 12 is arranged inside the cleaner case 11 eccentrically from the case center, and a spiral-shaped cyclone dust removal chamber 16 is provided outside the cleaner element 12.
The cleaner case 11 is arranged in a vertical position on the side of the engine, the intake hole 24 is opened at the bottom of the peripheral wall of the cleaner case 11, and the intake cylinder 25 extends downward from the intake hole 24. The upper end portion 25a is connected flush with one side wall of the intake hole 24 that opens in the cleaner case 11, and is connected tangentially to the intake hole 24, thereby forming the intake pipe 2.
The cross-sectional shape gradually changes from the lower starting end 25b formed in a circular or elliptical shape to the upper terminal end 25a formed in a square shape, and the cross-sectional area increases toward the cleaner case side. An engine air cleaner characterized by forming.