JPS6016772Y2 - Oil bath air cleaner - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an improvement of an oil bath type air cleaner used in general-purpose engines and the like.

[Conventional technology]

The conventional air cleaner as mentioned above is, for example,
As seen in Publications No. 7-383 and Japanese Utility Model Application No. 55-3141, an oil reservoir is provided at the bottom of the oil reservoir, and a filter element is disposed above the oil reservoir.
After the air sucked in from outside the air cleaner hits the oil in the oil reservoir, the air is passed through a filter element in the axial direction to purify the air and then sucked into the vaporizer provided outside the air cleaner.

However, in such an air cleaner, the filtration area of the filter element on the downstream side of the intake air from the oil reservoir is small, and oil is easily carried into the filter element by the intake air, so the life of the filter element is short, and the air cleaner is tilted. When this happens, oil in the oil reservoir tends to spill and flow into the carburetor, and there are also drawbacks such as difficulty in changing the oil.

[Purpose of invention]

Although the present invention is relatively small, it eliminates the drawbacks of the conventional ones mentioned above, and has a long filter element life.
To provide an oil bath type air cleaner that allows oil to flow into a carburetor even when the air cleaner is tilted, allows easy oil replacement, and maintains good air purification effect over a long period of time. That is.

[Structure of the idea]

In order to achieve this objective, the oil bath type air cleaner of the present invention has a cover equipped with a primary filter element placed above the oil pan, and a cover provided with a primary filter element placed below the oil pan.
An element case equipped with a secondary filter element is arranged, and the cover, oil pan, and element case are tightened so that they can be disassembled, and the annular oil reservoir formed in the oil pan and the inner periphery of the primary filter element are An annular oil shield plate is installed in the vertical space between the cover and the oil pan, and passes through the primary filter element in the axial direction from between the outer periphery of the oil pan and over the oil reservoir of the oil pan, and then passes through the primary filter element in the axial direction. An air passage is formed that passes from the inner circumferential side to the outer circumferential side and opens to the outer circumferential side of the element case.

〔Example〕

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings.

In the figure, reference numeral 1 denotes an oil pan made of a transparent synthetic resin shell, and this oil pan 1 includes an outer cylinder 2 and an inner cylinder 3 that is lower in height than the outer cylinder 2 and projects downward. and a bottom 4 that integrally connects the lower end of the outer cylinder 2 and the inner cylinder 3, and an oil reservoir 5 is formed inside the bottom 4 and below between the outer cylinders 3 and 2.

Note that the oil reservoir portion 5 is provided with partition plates (not shown) radially.

A cover 6 is disposed above the oil pan 1,
In this cover 6, an intermediate cylinder 8 is suspended from the lower surface of the outer periphery of the earthen wall of the cover main body 7, which has an inverted bowl shape. It is inserted to a position close to the oil 9 surface in 5.

A restraining cylinder 10 is provided on the earthen wall of the cover main body 7, located on the center side of the intermediate cylinder 8, and a primary filter element 11 is disposed between the restraining cylinder 10 and the inner cylinder 3 of the oil pan 1.
and an oil-shielding plate 12 are sandwiched, and a window hole 13 is formed in the holding tube 10 to communicate the upper part of the primary filter element 11 with the inner circumferential part of this element 11.

An element case 14 is disposed below the oil pan 1, and the element case 14 is formed into a cylindrical shape with a bottom. Secondary filter element 1 is placed on the outer circumferential side of
5 is being held.

An air outlet pipe 16 is communicated with the peripheral wall of the element case 14, and a flange 1 provided at the tip of the outlet pipe 16 is connected to the peripheral wall of the element case 14.
7 is configured to be connected to a carburetor (not shown).

A truncated conical protrusion 18 is formed at the center of the bottom of the element case 14, and the element 11 is formed from this protrusion 18.
A tightening bolt 19 passes through the center of the upper 14, oil pan 1, and cover 6 in the axial direction, and a wing nut 20 is tightened via a washer to the portion of this bolt 19 that protrudes above the cover body 7. The cover 6, the oil pan 1, and the element case 14 are fastened together so that they can be disassembled.

The oil shielding plate 12 is sandwiched between the inner cylinder 3 of the oil pan 1 and the primary filter element 11.
The oil shield plate 12 has an annular shape that covers the inner peripheral portion between the oil reservoir portion 5 and the oil reservoir portion 5, and the outer peripheral portion of the oil shield plate 12 is slightly inclined downward.

In the figure, reference numeral 21 is a gasket, 22 is an annular air suction port formed between the outer cylinder 2 of the oil pan 2 and the peripheral wall of the cover main body 7, and 23 is a cover 6 provided on the outer cylinder 2 of the oil pan 1. This is a protrusion for supporting the intermediate cylinder 8.

Next, the operation of the air cleaner configured as above will be explained.

When the engine is in motion, outside air is sucked in from the air suction port 22 formed between the outer cylinder 2 of the oil pan 1 and the peripheral wall of the cover main body 7, and this air bypasses the outer cylinder 2 and flows into the outer cylinder. 2
and the intermediate cylinder 8 of the cover 6, and is sprayed onto the surface of the oil 9 of the oil reservoir 5, and dust in the air adheres to the oil 9 and is removed, and the intermediate cylinder 8 and the inner cylinder 3 The dust is further captured and removed by the primary filter element 11, which has a coarse comparison pattern.

In this case, since there is an oil shielding plate 12 between the primary filter element 11 and the oil surface 9 of the oil reservoir 5, the oil particles contained in the air hit this oil shielding plate 12, so that the primary Oil particles introduced to the filter element 11 can be reduced.

The air that has passed through the primary filter element 11 in the axial direction descends from above this element 11 to the center side and inside the inner cylinder 3, and passes through a truncated conical protrusion provided at the lower end of the inner cylinder 3 and the bottom of the element case 14. 18, the secondary filter element 1 is finer than the primary filter element 11.
5, residual dust is captured and removed, and the purified air that has passed through this element 15 from the inner circumferential side to the outer circumferential side is sucked into the vaporizer through the air outlet pipe 16.

The air cleaner of the above-described embodiment can be directly connected to the carburetor, and a large elbow for connection is not required, so that the air cleaner and the engine using the air cleaner can be made compact as a whole.

Additionally, since the oil reservoir is relatively located at the top and the oil pan is transparent, there is an advantage that the oil can be inspected and replaced easily.

[Effect of idea]

As explained above, the oil bath type air cleaner according to the present invention has an oil pan on the element case, and outside air is sucked in between the oil pan and the cover provided on the oil pan, so the intake position is different from that of the conventional one. It is more expensive than the previous model, and the amount of dust sucked in is relatively small.
In addition, the primary and secondary filter elements are provided on the downstream side of the intake air from the oil reservoir, and dust is captured in two stages, so that dust can be sufficiently removed, and even when the oil runs out, both filter elements Dust can be reliably removed with a chisel, and the primary filter element has a coarse mesh and a secondary
Next, by making the mesh of the filter element finer,
By allowing air to pass through the secondary filter element from the inner circumferential side to the outer circumferential side, the filtration area can be increased, and the introduction of oil particles into the primary filter element can be prevented by intervening between the primary filter element and the oil reservoir. The inserted oil shield plate prevents this, allowing the primary and secondary filter elements to be used for long periods of time.Furthermore, the oil pan, cover, and element case can be disassembled, and the tightening is fixed, making it easy to replace the oil, Maintenance is easy, as the primary and secondary filter elements are easy to clean and replace.Moreover, the oil reservoir is located far away from the carburetor, and the height of the cylinder on the inner circumference side is sufficient. Therefore, even if the air cleaner and the engine are tilted, there is no fear that oil will flow into the carburetor from the oil reservoir, and there is an effect that deterioration of engine startability due to oil inflow can be prevented.

[Brief explanation of the drawing]

The figure is a half-cut front view showing an embodiment of the present invention. 1...Oil pan, 2...Outer cylinder, 3.
...Inner cylinder, 4...Bottom, 5...Oil reservoir, 6...Cover, 7...Cover body, 8. ...Intermediate tube, 9...Oil, 10...Suppressing tube, 11...Primary filter elm ment, 12...Oil shield plate , 13・
... Window hole, 14 ... Element case,
15... Secondary filter element, 16...
... Air outlet pipe, 17 ... Flange, 18.
...Protrusion, 19...Tightening bolt, 20
... Butterfly nut, 21 ... Gasket,
22... Air suction port, 23... Support projection.

Claims (1)

[Scope of utility model registration request] Place a cover with a primary filter element above the oil pan, place an element case with a secondary filter element below the oil pan, and tighten the cover, oil pan, and element case so that they can be disassembled. is fixed, and an annular oil shield plate is installed between the annular oil reservoir formed in the oil pan and the inner periphery of the primary filter element in the vertical direction, and an annular oil shield plate is installed between the cover and the outer periphery of the oil pan. 1 after passing above the oil sump of the oil pan
An oil bath type % type % characterized by forming an air passage that passes through the secondary filter element in the axial direction, further passes through the secondary filter element from the inner circumferential side to the outer circumferential side, and opens on the outer circumferential side of the element case.