JPH0618612U - Blow-by gas filter - Google Patents

Abstract

(57) [Summary] [Purpose] In a blow-by gas filter for an internal combustion engine, in which a filter element made of non-woven fabric is inserted in a case with an open upper surface, there is a gap between the corner of the filter element and the corner of the case. A blow-by gas filter having a structure that does not cause [Structure] The filter element 12 is inserted into the opening 15 of the case 11 to form a blow-by gas filter. The case 11 includes a side wall 11b and an end wall 1 on a bottom wall 11a.
1c, and an inwardly projecting portion 16 is provided where these intersect. The corners of the filter element 12 will surely abut the portion 16 and will not form voids there.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 TECHNICAL FIELD The present application relates to a blow-by gas filter used for filtering a blow-by gas filter of an internal combustion engine.

[0002]

[Prior art]

 The blow-by gas filter has a rectangular case 1 filled with a filter element 2 as shown in FIGS. A blow-by gas inlet 3 is provided on the side wall of the case 1. The filter element 2 has a rectangular parallelepiped shape and is made of a filter material such as a non-woven cloth. The open end of the upper surface of the case 1 has a rectangular planar shape.

The filter element 2 is inserted from the open end side of the case 1 and held in a state of being sandwiched by the inner peripheral surface of the case 1. Such a blow-by gas filter is used when the inlet 3 of the case 1 is connected to the crankcase of the internal combustion engine. The blow-by gas flows into the case 1 through the inflow port 3, flows through the filter element 2, and flows out to the atmosphere. During this time, the mist in the blow-by gas is captured by the filter element 2. When the pressure in the crankcase becomes negative, the air flows in through the filter element 2 and the dust in the air is retained by the filter element 2.

[0004]

[Problems to be solved by the device]

 When the filter element 2 is attached from the open end side of the case 1, a gap may be formed between the corner 2a of the filter element 2 and the corner 1a of the case 1. Such a void is formed because the filter element 2 is made of a filter material having a relatively elastic property such as a non-woven cloth, so that the side surface of the filter element 2 is pressed against the inner wall of the case 1 when the element is pressed. This is because it is not possible to maintain the corners of 90 degrees at 90 degrees.

When the above voids are formed, blow-by gas that is not filtered is discharged to the atmosphere, or dust in the atmosphere is sent into the crankcase.

[0006]

[Means for Solving the Problems]

 In a blow-by gas filter, a bottom wall is provided with facing side walls and end walls, one side wall has an inflow port, and a filter element is provided in a case having an opening on the upper surface. A part that protrudes inward is formed at the intersection of the end wall and the end wall, and a filter element made of non-woven fabric in the shape of a rectangular parallelepiped is inserted into the opening, and the side surface of the filter element is pressed against the side wall and the end surface is pressed against the end wall. In addition, the corners of the filter element are pressed into contact with the inwardly projecting portions.

[0007]

[Action]

 When the filter element is inserted into the opening of the case, the corner portion of the filter element surely contacts the inwardly projecting portion of the case. As a result, no air gap is formed between the filter element and the case.

[0006]

【Example】

 The blow-by gas filter of the present invention will be described with reference to an embodiment. Referring to FIGS. 1 to 3, the blow-by gas filter 10 comprises a case 11 and a filter element 12.

The case 11 has side walls 11b and 11b facing the bottom wall 11a and end walls 11c and 11c, and an upper surface thereof is open. An inflow port 13 is provided on one side wall 11b. A plurality of protrusions 14 are formed on the bottom wall 11a. Such a case 11 is made of a plastic material and is produced by integral molding.

The opening 15 on the upper surface of the case 11 is roughly rectangular, but its four corners 15a, 15a, 15a, 15a form a circumferential surface. Therefore, an inwardly projecting portion 16 is formed at the corner where the side wall 11b and the end wall 11c intersect.

The filter element 12 is made of a non-woven fabric in the shape of a rectangular parallelepiped, and is fitted into the opening 15 of the case. In the inserted state, the side surface 12a of the filter element 12 is in pressure contact with the side wall 11b of the case 11, and the end surface 12b is in pressure contact with the end wall 11c, and is retained in the case 11. The corner portion 12c of the filter element 12 is in pressure contact with the inwardly projecting portion 16 of the case 11.

The blow-by gas filter 10 is used by being integrated with an intake air filter of an internal combustion engine, for example. When the inflow port 13 of the side wall 16b of the case 11 is communicated with a crankcase (not shown), blow-by gas flows into the blow-by gas filter 10 under a positive pressure in the crank case and is filtered by the filter element 12. Be done. When the inside of the crankcase is under negative pressure, the atmosphere is supplied to the crankcase, and the dust in the atmosphere is captured by the filter element 12.

Next, another embodiment of the present invention will be described. As shown in FIG. 4, the case 20 has an opening 15a so that an inwardly projecting portion 16a has a substantially triangular shape. Is. Further, in each of the above embodiments, the heights of the end walls 11c of the cases 11 and 20 are different, but they may be the same. Further, the filter element 12 may have a layer thickness so as to be brought into contact with the protrusion 14 provided on the bottom wall 11a of the case 11.

[0012]

[Effect of device]

 As described above, according to the present invention, since no gap is formed between the corner portion of the filter element and the corner portion of the opening of the case, the blow-by gas is surely filtered, and the dust in the atmosphere is also reliably filtered. Improves filtration efficiency.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a plan sectional view of FIG.

FIG. 3 is a perspective view of a filter element.

FIG. 4 is a plan sectional view showing another embodiment.

FIG. 5 is a sectional view of a conventional filter.

FIG. 6 is a plan sectional view of FIG.

FIG. 7 is a plan view of FIG.

[Explanation of symbols]

 11 Case 11c End Wall 11a Bottom Wall 12 Filter Element 11b Side Wall 12a Corner 16 Protruding Inward

Claims (1)

[Scope of utility model registration request] 1. A blow-by gas filter in which a bottom wall is provided with side walls and end walls facing each other, one side wall has an inflow port, and a filter element is disposed in a case having an opening on the upper surface. In the above, a portion projecting inward is formed at the intersection of the side wall and the end wall, and a filter element having a rectangular parallelepiped shape of a nonwoven fabric is inserted into the opening, the side surface of the filter element is the side wall, and the end surface is the above. A blow-by gas filter having a structure in which a corner portion of a filter element is brought into pressure contact with an end wall while being brought into pressure contact with an end wall.