JPS6119777Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an oil bath type air cleaner for internal combustion engines.

Figure 1 shows this type of general oil bath air cleaner.
The air W taken in through the intake cylinder 3 collides with the oil in the oil reservoir 2 provided at the bottom of the air cleaner body 1 to temporarily separate the dust contained in the intake air W, and further, the intake air is reversed. When rising and passing through the filter medium 4, remaining dust is secondarily separated. Note that the intake air W that has collided with the oil X in the oil reservoir 2 contains minute oil droplets, and when the intake air W tinged with oil drops passes through the filter medium 4, the oil droplets are absorbed into the filter medium. 4 to maintain the filter medium 4 in a moderately moist state and promote dust adsorption. However, some users mistakenly think that increasing the amount of oil filled into the oil reservoir 2 will improve the air purification effect, or they may miscalculate the amount of oil and set the oil level to the appropriate level. It may be inserted to a height exceeding A. When the engine is operated at high speed with a large amount of oil filled in the oil reservoir 2, the oil level L of the oil It is deformed so that its central part (the part immediately below the intake pipe 3) is low and its outer peripheral part is high, so that a part of the oil X comes into contact with the lower surface of the filter medium 4 and wets the filter medium 4 more than necessary. Become. Note that if the amount of oil in the oil reservoir 2 is increased more than necessary, some of the oil will easily come into contact with the lower surface of the filter medium 4 even if a vehicle, etc. equipped with this air cleaner tilts or vibrates. There is a risk. If more oil droplets than necessary adhere to the filter medium 4 in this way, intake air containing a large amount of oil droplets will be sucked into the cylinder from then on, causing generation of white smoke and irregular combustion.

The present invention has been made in consideration of the problems with the conventional oil bath type air cleaners described above, and aims to provide an oil bath type air cleaner which prevents the oil from coming into contact with the underside of the filter material even if a relatively large amount of oil (above the appropriate oil level) is mistakenly filled into the oil reservoir at the bottom of the air cleaner body, and which prevents an increase in the number of parts even if the oil is prevented from coming into contact with the underside of the filter material. The air cleaner body is made up of an oil pan which forms the oil reservoir and is connected to the lower part of an outer cylinder via an annular sealing member, and an intake cylinder is inserted and fixed into the air cleaner body so that its outlet opening faces the oil reservoir from above,
In the oil bath type air cleaner, a filter medium is disposed in the intake passage formed between the inner surface of the air cleaner body and the outer surface of the intake cylinder,
The sealing member is characterized in that an inward protruding member is integrally provided on the lower side of the filter material and at a position higher than the appropriate oil level in the oil reservoir to prevent the oil level of the oil filled in the oil reservoir from rising.

The oil bath type air cleaner of the present invention will be explained below based on the embodiments shown in FIG. 2 and subsequent figures.
The oil bath type air cleaner of the first embodiment of the present invention shown in Figure 2 is constructed by inserting a cylindrical intake cylinder 3 into the center of a bottomed, cylindrical air cleaner body 1 which has an oil reservoir 2 at its bottom, and further housing a filter material 4 in an annular intake passage 6 formed between the inner surface of the air cleaner body 1 and the outer surface of the intake cylinder 3.

The air cleaner main body 1 has an oil pan 8 disposed at the bottom of a substantially cylindrical outer cylinder 7 via an annular seal member 11.
The inside of the oil pan 8 serves as an oil reservoir 2.

The intake cylinder 3 is inserted and fixed in the center of the air cleaner body 1 so as to face vertically. The outlet opening 3a of the intake cylinder 3 opens downward at a position slightly above the proper oil level L of the oil X filled in the oil reservoir 2. The oil pan 8 is provided with a proper oil level mark 9 for indicating the proper oil level height A of the oil X filled therein.

A spongy filter medium 4 is annularly disposed between the inner surface of the outer cylinder 7 and the outer surface of the intake pipe 3 and has an appropriate thickness. The height of the lower surface 4a of the filter medium 4 is slightly above the outlet opening 3a of the intake cylinder 3, and is considerably higher than the appropriate oil level mark 9.

On the inner surface of the air cleaner body 1, there is provided a peripheral edge of the inlet 6a of the intake passage 6 and a lower surface 4a of the filter medium 4.
An annular inwardly protruding member 10 is provided that protrudes inwardly at an intermediate position between the oil level mark 9 and the proper oil level mark 9. The inwardly protruding member 10 is integrally formed with the seal member 11 interposed between the lower end of the outer cylinder 7 and the upper end of the oil pan 8 . The inwardly protruding member 10 (sealing member 11) is made of a synthetic resin with good oil resistance, such as nylon 6. This inwardly protruding member 10 acts as a partition member to prevent the oil in the oil reservoir 2 from coming into direct contact with the lower surface 4a of the filter medium 4 due to a rise in the oil level. The width of the inward protrusion of the main body 1 can be designed as appropriate.

As for the exhaust port 5, an intake outlet 5 is formed in the upper side wall of the outer cylinder 7, and a carburetor can be connected to the intake outlet 5.

Next, to explain the function of the air cleaner shown in FIG. 2, there is usually a proper oil level mark 9 in the oil reservoir 2.
The oil is filled to a height of . When the engine rotates, the air W taken in flows down through the intake cylinder 3, and when the air W collides with the oil X, the dust contained in the intake air W is moved into the oil X by its inertia. Further, the intake air W reverses upward and passes through the filter medium 4, and at that time, the dust contained in the air W is temporarily separated, and clean air W is taken in. Exit 5
It acts to supply water from the inside of the cylinder. or,
When the intake air W reverses upward from the intake cylinder outlet opening 3a, minute oil droplets are mixed into the intake air W, but when the intake air W mixed with the oil droplets passes through the filter medium 4, The oil droplets adhere to the filter medium 4 and maintain the filter medium 4 in an appropriately moist state. Note that when the engine is in a high-speed rotation state, the flow velocity of the intake air W flowing down inside the intake cylinder 3 increases, causing the oil level L of the oil However, if the amount of oil filled in the oil reservoir 2 is within the appropriate oil level height A, the outer peripheral portion of the oil level L' will not be pushed up too high.

However, as shown in Fig. 3, if the oil level L of the oil X filled in the oil reservoir 2 exceeds the appropriate oil level height A, the oil level L will increase accordingly and As the oil level L approaches the intake cylinder outlet opening 3a, the deformation effect on the oil level L by the intake air W discharged from the intake cylinder outlet opening 3a becomes stronger, and the outer peripheral portion of the oil X becomes as shown by the chain line L''. Although the oil tries to be pushed up considerably, the outer peripheral portion of the oil is obstructed by the inwardly protruding member 10 interposed between the outer cylinder 7 and the oil pan 8, and is not pushed upwards beyond the inwardly protruding member 10. Therefore, even if a large amount of oil is mistakenly filled into the oil reservoir 2, the oil surface L will not come into contact with the lower surface 4a of the filter medium 4, and the filter medium 4 will not last for a long time. There is a technology that prevents over-humidity from occurring.In addition, even if a vehicle equipped with an engine equipped with this air cleaner tilts or vibrates significantly and the oil level L fluctuates, the inwardly protruding member 1
0 does not push the oil level L any higher.

Furthermore, since the inwardly protruding member 10 is integrally formed with the sealing member 11 interposed between the lower end of the outer cylinder 7 and the upper end of the oil pan 8, the provision of the inwardly protruding member 10 allows the parts to be The number of points does not increase, and the sealing surface between the outer cylinder 7 and the oil pan 8 also does not increase (2 between the lower surface of the outer cylinder 7 and the upper surface of the seal member 11, and between the lower surface of the seal member 11 and the upper surface of the oil pan 8). (parts only).

FIG. 4 shows an oil bath type air cleaner according to another embodiment of the present invention. Three stages of inward flanges 13, 13, 13 are integrally formed in the vertical direction, and each inward flange 13, 13, 13 serves as an inward protruding member 10 that prevents the oil level of oil X from rising. In the air cleaner of this embodiment, when the outer circumferential portion of the oil be.

Next, to explain the effects of the present invention, the oil bath type air cleaner of the present invention has the following effects.

(1) The annular seal member 11 is disposed between the outer cylinder 7 and the oil pan 8 constituting the air cleaner body 1, and is disposed below the filter material 4 and in the oil reservoir 2.
Since an inward protruding member 10 is provided to prevent the oil level of the oil X from rising at a position higher than the appropriate oil level A within the oil reservoir 2, even if a user mistakenly or erroneously fills the oil reservoir 2 with more oil than necessary, the outer peripheral portion of the oil X will not be pushed up by the inward protruding member 10, and therefore the oil will not come into direct contact with the lower surface 4a of the filter medium 4.

(2) Due to the effect of (1) above, the filter medium 4 is maintained in a moderately moist state for a long period of time, and the replacement period of the filter medium 4 can be extended, and the oil in the air cleaner is not mixed into the intake air W. Since the fuel is not sent to the cylinder side, generation of white smoke and irregular combustion can be prevented.

(3) Since the inwardly protruding member 10 is integrally provided with the sealing member 11, even if the oil level of the oil and oil pan 8
The number of seal parts between the two does not increase, and the seal structure does not become complicated.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a conventional oil bath type air cleaner, Fig. 2 is a longitudinal sectional view of an oil bath type air cleaner according to an embodiment of the present invention, Fig. 3 is an explanatory diagram of the operation of the air cleaner shown in Fig. 2, and Fig. 4 1 is a vertical cross-sectional view of a lower half of an oil bath type air cleaner according to an embodiment of the present invention. 1... Air cleaner body, 2... Oil reservoir,
3... Intake cylinder, 4... Filter medium, 4a... Lower surface of filter medium,
6... Intake passage, 7... Outer cylinder, 8... Oil pan, 10... Inwardly protruding member, 11... Seal member, X... Oil.

Claims (1)

[Scope of utility model registration request] An intake cylinder 3 is connected to an air cleaner body 1 formed by connecting an oil pan 8 forming an oil reservoir 2 to the lower part of an outer cylinder 7 via an annular seal member 11, and an outlet opening 3a is connected to the oil reservoir 2 from above. The filter material 4 is inserted and fixed in such a way that it faces the air cleaner body 1 , and the filter material 4 is disposed in the intake passage 6 formed between the inner surface of the air cleaner main body 1 and the outer surface of the intake pipe 3 . An inward protruding member 10 is integrally provided on the lower side and at a position higher than the appropriate oil level height A in the oil reservoir 2 to prevent the oil level of the oil X filled in the oil reservoir 2 from rising. This oil bath type air cleaner is characterized by: