JPS622260Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a blow-by gas filter device for treating blow-by gas generated in an internal combustion engine.

(Prior Art) In an internal combustion engine, blow-by gas containing carbon particles, oil mist, acidic moisture, etc. is generated.

A system is being used in which this blow-by gas is returned to the intake side and re-burned without being released into the atmosphere. FIG. 1 shows an example of this, in which an intake passage 2 is connected to a combustion chamber 5 in the engine body, and the engine A blow-by gas passage is connected to introduce internal blow-by gas into the intake passage 2, and a PCV (positive crankcase) is installed in this blow-by gas passage.
Ventilation) valve is installed. Further, a conduit 23 is connected between the rocker cover 7 on the upper part of the engine body and the air cleaner 6.

In this configuration, most of the blowby gas 1 generated by the internal combustion engine enters the blowby gas passage from inside the crankcase 3, and after the flow rate is adjusted by the PCV valve 4, it enters the intake passage 2 and is reburned. Part of the blow-by gas is covered by Rotzker cover 7.
The air then reaches the air cleaner 6 and is sucked into the internal combustion engine through the intake passage 2. When the pressure inside the crankcase 3 becomes lower than atmospheric pressure, the air cleaner 6
Fresh air is supplied from the engine through the rocker cover 7 into the crankcase 3. A protector 10 shown in FIGS. 2 and 3 is fixed to the connection portion of the conduit 23 on the inner surface of the side wall of the casing 9 of the air cleaner 6, and a member 8 is disposed inside the protector 10.

When this protector 10 is fixed to the side wall of the casing 9 of the air cleaner 6, only the upper end surface is open and the other end is closed, and the inner space is closed to the conduit 2.
It is connected to 3. A rectangular parallelepiped material 8 cut into approximately the same shape as the inner space of the protector is inserted into the space formed between the inner surface of the casing side wall and the protector 10, and each surface of the material 8 other than the upper end surface is connected to the casing. 9 and the protector 10 are in close contact with each wall.

(Problems to be solved by the invention) The material 8 serves to remove dust in the atmosphere when the pressure inside the crankcase 3 is lower than atmospheric pressure and fresh air is introduced. However, both sides, bottom, front, and back of the material 8 are in close contact with the side walls of the protector 10 and the casing 9, and only the top surface is in contact with the atmosphere.As shown in FIG. The clogging progresses quickly, increasing ventilation resistance and causing internal combustion engine malfunction. Therefore, there is a problem in that the material 8 has to be replaced even though the parts other than the upper surface are not yet clogged.

(Means for Solving the Problems) The present invention has been made to solve the above problems, and it is possible to replace the protector that holds the material of the blow-by gas filter device installed in the blow-by gas re-combustion system with the air cleaner. In a blow-by gas filter device, a rectangular parallelepiped material is fixed to the inner surface of the casing side wall to form a space between the protector and the casing, and a rectangular parallelepiped material is inserted into the space. It forms a flow path through which gas and atmosphere can flow.

(Function) When the pressure inside the crankcase becomes lower than atmospheric pressure, fresh air comes into contact with the upper end surface of the protector of the blow-by gas filter device and the flow path formed between the side wall of the protector and the side surface of the material. Dust contained on the top and side surfaces of the material is captured and becomes clean air that enters the crankcase through the rocker cover.

(Example) Figures 4 and 5 show a blow-by gas filter device of the present invention, in which a protector 15 fixed to the inner surface of the side wall of the casing 9 of an air cleaner for an internal combustion engine, a pipe 11 provided on the outer surface of the side wall of the casing 9, and the protector 15 and a material 8 housed in the interior. The protector 15 is formed from a thin plate material, and further includes a plate-shaped retaining plate 16 curved in the same way as the side wall of the casing 9, and side walls 18 and 18' formed by raising both sides of the retaining plate 16 obliquely outward. Holding plate 1
6 and a bottom wall 14 vertically raised below the bottom wall 6. Each of the bottom wall 14 and the side walls 18, 18' has a flange extending therethrough, and the flange is fixedly sealed to the inner circumferential wall of the casing 9 of the air cleaner, and the inner circumferential wall of the casing 9 is connected to the protector 15 facing the inner circumferential wall of the air cleaner. A filter chamber 17 is formed. A pipe 11 communicating with the filter chamber 17 is fixed to the outer wall of the casing 9.

A rectangular parallelepiped-shaped member 8 made of nonwoven fabric or synthetic fiber shown in FIG. 6 is inserted into the filter chamber 17,
The front surface of the material 8 is in close contact with the curved surface 16 of the protector 15, the back surface is in close contact with the inner surface of the side wall of the casing 9, and the bottom surface is in close contact with the bottom wall 14 of the protector 15, and between the side surface of the material 8 and the side walls 18, 18' of the protector 15. Flow passages 19, 19' are formed in. The upper surface of the member 8 is open into the air cleaner.

When the engine operates, a portion of the blowby gas generated in the crankcase reaches the PCV valve from the blowby gas flow path, the flow rate is adjusted by the PCV valve, and the blowby gas returns to the intake passage again. The other part of the blow-by gas enters the material 8 from a conduit provided on the rocker cover via a pipe 11 provided on the outer wall of the air cleaner casing, and oil mist and the like are coagulated and separated within the material 8, and are discharged into the air cleaner. flows into. When the pressure inside the crankcase becomes lower than atmospheric pressure, fresh air flows from the protector 15 of the blow-by gas filter device and the side surface and top surface in contact with the flow passages 19, 19' of the material 8 held between the casing 9 and the upper surface of the blow-by gas filter device, as shown in FIG. As shown by the arrow, the dust passes through the inside of the material 8 and is captured.

In the creator's experiments, the dimensions of the material shown in Figure 6 were a
When comparing the conventional protector and the protector of the present application with = 50 mm, b = 10 mm, and C = 25 mm,
The results showed that the ventilation resistance was reduced by about 20%, and the life span was about doubled.

Another embodiment is shown in FIG. This protector 2
0 has the same shape as the first embodiment except for the shape of the bottom wall. The bottom wall 22 is formed with a stepped portion 21 that projects further downward from the middle of its depth. This protector 20 is firmly sealed to the inner surface of the side wall of the casing 9, and a rectangular parallelepiped member 8 is inserted into a filter chamber 17 formed by the casing 9 and the protector 20. In this case, the side of the material 8 and the protector 2
In addition to the flow passages 19 and 19' formed by the side wall of 0 and the casing 9, the space between the bottom surface of the material 8 and the stepped portion 21 of the protector 20 also serves as a flow passage, and the surface of the material 8 in contact with the flow passage also Do dust removal.

(Effects of the invention) As described above, the present invention is used as a protector for holding the material of a blow-by gas filter device, and forms a flow path through which blow-by gas and the atmosphere can flow between the side wall of the protector and the side of the material.
The upper and side surfaces of the material increase the surface area for blow-by gas and atmospheric air to trap dust, extending the life of the material and therefore extending the time for replacement, as well as eliminating blow-by gas and air. Atmospheric ventilation resistance can be reduced.

[Brief explanation of the drawing]

Fig. 1 is an overall circuit diagram of a blow-by gas flow path, Fig. 2 is a perspective view of a conventional blow-by gas filter device, Fig. 3 is a sectional view of the same device, and Fig. 4 is a plan view of the blow-by gas filter device of the present invention. Figure 5 is a perspective view of the same device before material is inserted, Figure 6 is a perspective view of the material inserted into the device, and Figure 7 is the state of dust attached to the material inserted into the conventional device. FIG. 8 is a perspective view of another embodiment of the blow-by gas device. 8... Material, 9... Casing, 15, 20...
... protector, 14 ... bottom wall, 16 ... retaining plate,
18, 18'... side wall, 19, 19'... flow path,
21...Danbe.

Claims (1)

[Scope of utility model registration request] A pipe communicating with the inside of the engine is provided on the side wall of the casing of an air cleaner for an internal combustion engine, and a protector consisting of a plate-shaped retaining plate and side walls and bottom walls raised on both sides and below thereof is fixed to the side wall of the casing. A filter chamber is formed between the protector and the casing, a rectangular parallelepiped material is inserted into the filter chamber, and the front and back surfaces of the material are sandwiched between the holding plate and the side wall of the casing, so that at least the side surface of the material is A blow-by gas filter device characterized in that a flow path is formed between the side wall of the protector and the side wall of the protector.