JP2015004330A - Oil mist separator and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil mist separator having high design flexibility that can respond to performance of various internal combustion engines.SOLUTION: An oil mist separator 1 includes: a housing 2 installed separately from a body of an internal combustion engine; and an oil acquisition portion 3 that is accommodated in the housing to acquire oil included in blow-by gas generated within the internal combustion engine. The housing is constituted by axially joining a cylindrical upstream side half divided body 5 having an inflow port 8 of the blow-by gas formed thereon to a cylindrical downstream side half divided body 6 in which an outflow port 13 of the blow-by gas and a discharge port 14 of the oil acquired by the oil acquisition portion are formed. The oil acquisition portion 3 is nipped between the upstream side half divided body 5 and the downstream side half divided body 6.

Description

  The present invention relates to an oil mist separator and a method for manufacturing the same, and more particularly to an oil mist separator having a high degree of freedom in design that can cope with the performance of various internal combustion engines and a method for manufacturing the same.

  Conventionally, a so-called PCV system (Positive Crankcase Ventiration System) that separates oil mist contained in blow-by gas generated in an internal combustion engine, returns the oil component to the oil pan, and returns the gas component to the intake system for recombustion. )It has been known. As an oil mist separator used in this PCV system, a blowby gas passage is formed on the inner surface of a cylinder head cover (rocker cover), and a nozzle and a filter are provided in this passage (for example, Patent Document 1). In the oil mist separator of Patent Document 1, the cylinder head cover is particularly bulky in the height direction, and it is difficult to meet the vehicle requirements for lowering the bonnet.

  In view of this, an oil mist separator that solves the above problem is known that is provided separately from the main body of the internal combustion engine (see, for example, Patent Document 2). For example, as shown in FIG. 12, this Patent Document 2 includes a housing 102 provided separately from the main body of the internal combustion engine, and an oil trap 103 provided in the housing 102, and the oil trap 103 Discloses an oil mist separator 101 having a filter 117 disposed to face the nozzle 109 and a filter support 118 for supporting the filter 117. The housing 102 includes a plate-like upstream member 105 to which a blow-by gas inlet 108 is attached, and a cylindrical downstream member 106 to which a blow-by gas outlet 113 and an oil outlet 114 are attached. Are joined in the axial direction. Further, a filter support 118 is fixed to the peripheral wall 106 a in the downstream member 106.

Japanese Utility Model Publication No. 61-198514 JP 09-47617 A

  Here, in an internal combustion engine, the flow rate of blow-by gas usually changes depending on the displacement. In the oil mist separator 101 of Patent Document 2, the oil O captured by the filter 117 is discharged from the discharge port 114. However, if the flow rate of blow-by gas passing through the downstream side of the filter 117 is high, the oil O is captured. The oil O that has been splattered again flows out from the outlet 113. In order to prevent the oil from re-scattering, it is necessary to change the downstream member 106 to one having a large vertical cross-sectional area to reduce the flow rate of blow-by gas in the downstream member 106.

  However, in the oil mist separator 101 of Patent Document 2, the filter support 118 is fixed to the peripheral wall 106a of the downstream member 106. Therefore, when the downstream member 106 is changed to have a different vertical cross-sectional area, the filter support The external shape of the body 118 also needs to be changed. Here, the above-mentioned Patent Document 2 does not particularly describe the development of various uses of the oil mist separator in accordance with the performance of various internal combustion engines, but the design can be freely performed in consideration of components such as nozzles and filters. There is a demand for a highly structured structure.

  The present invention has been made in view of the above-described situation, and an object thereof is to provide an oil mist separator having a high degree of freedom in design that can cope with the performance of various internal combustion engines and a method for manufacturing the same.

In order to solve the above problem, an invention according to claim 1 is a housing provided separately from a main body of an internal combustion engine, and oil contained in blow-by gas contained in the housing and generated in the internal combustion engine. An oil mist separator, wherein the housing has a cylindrical upstream half formed with a blow-by gas inlet, a blow-by gas outlet, and the oil trap. A cylindrical downstream half formed with a discharge port for the oil trapped in the axial direction, and the oil catching portion is formed by connecting the upstream half and the downstream half. The gist is that it is sandwiched between the body.
According to a second aspect of the present invention, in the first aspect, the upstream half is formed with a nozzle portion for increasing the flow rate of blow-by gas, and the oil catching portion is disposed opposite the nozzle portion. And a filter support that supports the filter and has a blow-by gas flow passage formed therein.
According to a third aspect of the present invention, in the second aspect of the present invention, a rib projects from the inner surface of the upstream half, and the filter support is joined to the upstream half. The filter is sandwiched between an end side and / or the rib and a joining end side of the downstream half, and the filter is interposed between a step formed on the rib and the filter support. It is a summary.
In order to solve the above problem, an invention according to claim 4 is a method for producing an oil mist separator according to any one of claims 1 to 3, wherein a plurality of types of the downstream halves are provided. An oil mist separator is prepared by joining one kind of the downstream half split body selected from a plurality of types of the downstream half split bodies and the upstream half split body with the oil trapping portion interposed therebetween. The gist is to obtain.
In order to solve the above problem, an invention according to claim 5 is a method for producing an oil mist separator according to any one of claims 1 to 3, wherein a plurality of types are used as the upstream half. An oil mist separator is prepared by joining one type of the upstream half and the downstream half selected from a plurality of types of the upstream half and sandwiching the oil trapping portion therebetween. The gist is to obtain.

According to the oil mist separator of the present invention, the housing is formed with a cylindrical upstream half that is formed with a blow-by gas inlet, and a blow-by gas outlet and an oil outlet that is captured by the oil trap. The cylindrical downstream halves thus formed are joined in the axial direction, and the oil catcher is sandwiched between the upstream halves and the downstream halves. As a result, if multiple types of upstream halves and / or downstream halves are prepared, the optimum upstream halves and / or downstream halves are selected according to the performance of the internal combustion engine. Can be used in common, and the oil trapping part having the same outer shape can be used in common. Therefore, the degree of freedom in designing the oil mist separator is increased.
According to the oil mist separator of the present invention, blow-by gas generated in the internal combustion engine flows into the housing from the inflow port, and after the oil is captured by the oil capturing unit, it flows out of the housing through the outflow port. . Further, the oil captured by the oil capturing part is discharged out of the housing through the discharge port of the downstream half.
In addition, a nozzle portion for increasing the flow rate of blow-by gas is formed in the upstream halved body, and the oil trapping portion supports a filter disposed opposite to the nozzle portion, supports the filter, and supplies blow-by gas. And a filter support having a flow passage formed therein, the blow-by gas has its flow velocity increased by the nozzle portion in the upstream half of the body and collides with the filter to capture oil, and the flow passage of the filter support. To the downstream half. Thereby, oil can be captured while clogging of the filter is suppressed. Moreover, since the nozzle part is integrally formed in the upstream half, the number of parts can be reduced and a simple structure can be achieved. As a result, for example, a plurality of types can be easily prepared as downstream halves with different longitudinal cross-sectional areas of the internal space and upstream halves with different vertical cross-sectional areas of the nozzle portions.
Furthermore, a rib protrudes from the inner surface of the upstream half, and the filter support is connected to the joint end of the upstream half and / or the rib and the downstream half. When the filter is interposed between the stepped portion formed on the rib and the filter support, it is ensured even if a relatively soft filter is employed. Can be held in. Moreover, since the rib for holding a filter with a nozzle part is integrally formed in the upstream half body, the number of parts can further be reduced and it can be set as a simple structure. As a result, for example, a plurality of types can be more easily prepared as downstream halves with different longitudinal cross-sectional areas of the internal space and upstream halves with different vertical cross-sectional areas of the nozzle portions.
According to the method for producing an oil mist separator of the present invention, a plurality of types of downstream halves are prepared, and one type of downstream halves and an upstream half selected from a plurality of types of downstream halves. An oil mist separator is obtained by joining the split body with the oil catching portion interposed therebetween. Accordingly, the optimum downstream half body can be selected and used according to the performance of the internal combustion engine, and the oil trapping portion having the same outer shape can be used in common. Therefore, the degree of freedom in designing the oil mist separator is increased.
According to the method for producing an oil mist separator of the present invention, a plurality of types of upstream halves are prepared, and one type of upstream halved and downstream half selected from a plurality of types of upstream halves. An oil mist separator is obtained by joining the split body with the oil catching portion interposed therebetween. Thus, the optimum upstream half can be selected and used in accordance with the performance of the internal combustion engine, and the oil trapping part having the same outer shape can be used in common. Therefore, the degree of freedom in designing the oil mist separator is increased.

The present invention will be further described in the following detailed description with reference to the drawings referred to, with reference to non-limiting examples of exemplary embodiments according to the present invention. Similar parts are shown throughout the several figures.
1 is a longitudinal sectional view of an oil mist separator according to Example 1. FIG. It is the II-II sectional view taken on the line of FIG. It is a disassembled perspective view of the said oil mist separator. It is a front view of the filter support body which concerns on Example 1, (a) shows the filter support body for a comparatively low density filter, (b) shows the filter support body for a comparatively high density filter. It is explanatory drawing for demonstrating the manufacturing method of the said oil mist separator. 6 is a longitudinal sectional view of an oil mist separator according to Example 2. FIG. 6 is a front view of a filter support according to Example 2. FIG. It is a disassembled perspective view of the said oil mist separator. It is explanatory drawing for demonstrating the manufacturing method of the said oil mist separator. It is explanatory drawing for demonstrating the manufacturing method of the oil mist separator of another form. Furthermore, it is explanatory drawing for demonstrating the manufacturing method of the oil mist separator of another form. It is explanatory drawing for demonstrating the conventional oil mist separator.

  The items shown here are exemplary and illustrative of the embodiments of the present invention, and are the most effective and easy-to-understand explanations of the principles and conceptual features of the present invention. It is stated for the purpose of providing what seems to be. In this respect, it is not intended to illustrate the structural details of the present invention beyond what is necessary for a fundamental understanding of the present invention. It will be clear to those skilled in the art how it is actually implemented.

<Oil mist separator>
The oil mist separator according to the present embodiment includes a housing (2, 32) provided separately from the main body of the internal combustion engine, and oil that is contained in the housing and that captures oil contained in blow-by gas generated in the internal combustion engine. An oil mist separator (1, 31) provided with a catching part (3, 33) (see, for example, FIGS. 1 and 6). The housing is captured by a cylindrical upstream half (5, 35) in which blow-by gas inlets (8, 38) are formed, a blow-by gas outlet (13, 43), and an oil trap. The cylindrical downstream halves (6, 36) in which the oil discharge ports (14, 44) are formed are joined in the axial direction. Furthermore, the oil catching part (3, 33) is sandwiched between the upstream half (5, 35) and the downstream half (6, 36).

  As the oil mist separator according to the present embodiment, for example, the upstream half (5) is provided with a nozzle portion (9) for increasing the flow rate of blow-by gas, and the oil catching portion (3) And a filter support (18, 18 ′) that supports the filter and is formed with a flow passage (19, 19 ′) for blow-by gas. For example, see FIG.

  In the case of the above-mentioned form, for example, the rib (11) is formed to protrude on the inner surface side of the upstream half (5), and the filter support (18, 18 ') is formed on the upstream half. The filter (17, 17 ') is sandwiched between the joint end side of the body and / or the rib and the joint end side of the downstream half (6), and the filter (17, 17') It can be interposed between the supports (18, 18 ′) (see, for example, FIG. 1).

  In the case of the above-mentioned form, for example, flange portions (10, 15) that are in contact with each other and joined to each of the joining end sides of the upstream half (5) and the downstream half (6). An annular stepped portion (12) is formed on the joining end side of the upstream half, and the filter support (18, 18 ') is formed of the stepped portion (12) and / or the rib (11). And the flange portion (15) of the downstream half (6) (see, for example, FIG. 1). As a result, for example, a plurality of types can be more easily prepared as the downstream halves having different vertical cross-sectional areas of the internal space and the upstream halves having different vertical cross-sectional areas of the nozzle portions.

  As an oil mist separator according to the present embodiment, for example, the oil catching portion (33) has an outer peripheral portion sandwiched between an upstream half (35) and a downstream half (36) and blow-by. A configuration comprising a filter support (48) in which a gas flow passage (49) is formed, and a filter (47) attached to the filter support so as to block the flow passage (49) (see, for example, FIG. 6) ). As a result, substantially the entire amount of blow-by gas flowing into the housing passes through the filter and oil is captured. Therefore, oil capture efficiency can be increased.

  In the case of the above-mentioned form, for example, flange portions (40, 45) to be joined to each other are formed on the joining end sides of the upstream half (35) and the downstream half (36), and the upstream half An annular stepped portion (41) is formed on the joint end side of the side halved body, and the filter support (48) includes a stepped portion (41) and a flange portion (45) of the downstream half divided body (36). Can be sandwiched between. Thereby, for example, a plurality of types can be prepared more easily as downstream halves having different longitudinal cross-sectional areas of the internal space.

<Oil mist separator manufacturing method>
The method for producing an oil mist separator according to the present embodiment is a method for producing an oil mist separator according to the above embodiment, wherein a plurality of types are prepared as downstream halves, and a plurality of types of downstream halves (6A) are prepared. , 6B, 36A, 36B) with one kind of downstream half (6, 36) and upstream half (5, 35) sandwiched between the oil traps (3, 33). It joins and obtains an oil mist separator (1, 31) (for example, refer to Drawing 5 and Drawing 9, etc.).

  The method for producing an oil mist separator according to the present embodiment is a method for producing an oil mist separator according to the above embodiment, wherein a plurality of types are prepared as upstream halves, and a plurality of types of upstream halves (5A) are prepared. 5B) and joining one kind of the upstream half (5) and the downstream half (6) with the oil trapping part (3) sandwiched between them, the oil mist separator (1) (See, for example, FIG. 10).

  The method for producing an oil mist separator according to the present embodiment is a method for producing an oil mist separator according to the above embodiment, wherein a plurality of types are prepared as an upstream half and a downstream half, and a plurality of types of upstream One type of upstream half (5) selected from the side halves (5A, 5B) and one type selected from a plurality of types of downstream halves (6A, 6B) An oil mist separator (1) is obtained by joining the downstream half (6) with the oil trapping part (3) interposed therebetween (see, for example, FIG. 11).

  In the case of the above-mentioned form, for example, a plurality of types having different longitudinal sectional areas (S1, S2) of the internal space can be prepared as the downstream halves (6, 36) (see, for example, FIGS. 5 and 9). . Thereby, the optimal downstream half body can be easily selected according to the performance of the internal combustion engine (particularly, engine displacement).

  In the case of the above-described embodiment, for example, a plurality of types having different vertical cross-sectional areas (S3, S4) of the nozzle portion can be prepared as the upstream half (5) (see, for example, FIG. 5). Thereby, the optimal downstream half body can be easily selected according to the performance of the internal combustion engine (particularly, engine displacement).

  In addition, the code | symbol in the parenthesis of each structure described in the said embodiment shows the correspondence with the specific structure as described in the Example mentioned later.

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

<Example 1>
(1) Configuration of Oil Mist Separator As shown in FIGS. 1 to 3, the oil mist separator 1 according to the first embodiment includes a housing 2 provided separately from a main body of an internal combustion engine (not shown), and the housing 2. And an oil catcher 3 that catches oil contained in blow-by gas that is contained in the engine and is generated in the internal combustion engine. The housing 2 is configured by joining a cylindrical upstream half 5 and a downstream half 6 made of resin in the axial direction.

  The upstream half body 5 has a bottom wall 5a and a cylindrical peripheral wall 5b extending in the axial direction from the outer peripheral edge side of the bottom wall 5a. A cylindrical inflow port 8 extending outward in the axial direction is formed on the bottom wall 5a. The inflow port 8 allows blow-by gas generated in the internal combustion engine to flow into the housing 2. In addition, a nozzle portion 9 having a smaller vertical cross-sectional area than the inflow port 8 is formed on the bottom wall 5a. The nozzle unit 9 increases the flow rate of the blow-by gas that passes therethrough. Further, a flange portion 10 that extends in the centrifugal direction is formed on the open end side of the peripheral wall 5b (that is, the joining end side of the upstream half body 5). An annular step 12 for holding a filter support described later is formed on the open end side of the peripheral wall 5b. Furthermore, a plurality of (four in the drawing) ribs 11 are formed to protrude on the inner peripheral surface of the peripheral wall 5b at a predetermined angular interval (for example, 45 degrees) in the circumferential direction (see FIG. 2). Each rib 11 is formed with a step portion 11a for holding a filter to be described later.

  The downstream halved body 6 has a bottom wall 6a and a cylindrical peripheral wall 6b extending in the axial direction from the outer peripheral edge side of the bottom wall 6a. A cylindrical outflow port 13 extending outward in the axial direction is formed in the bottom wall 6a. The outflow port 13 causes the blow-by gas, in which oil is captured by the oil capturing unit 3, to flow out of the housing 2. Moreover, the cylindrical discharge port 14 extended below is formed in the surrounding wall 6b. The discharge port 14 discharges the oil captured by the oil capturing unit 3 to the outside of the housing 2. A flange portion 15 that extends in the centrifugal direction is formed on the open end side of the peripheral wall 6b (that is, the joint end side of the downstream half 6). The flanges 10 and 15 of the upstream half 5 and the downstream half 6 are abutted with each other and joined by joining means such as vibration welding, laser welding, adhesion, and screws.

  In the present embodiment, the inlet 8 is connected to the other end of a pipe (not shown) having one end connected to the crank chamber or cylinder head cover of the internal combustion engine, and the outlet 13 has one end connected to the internal combustion engine. It is assumed that the other end of a pipe (not shown) connected to the intake side is connected. Further, the oil mist separator 1 is attached to a predetermined location in the internal combustion engine or the engine room by gripping the outer periphery of the upstream half body 5 with an attachment clamp (not shown).

  The oil trap 3 has a gas-liquid separation function for separating the blow-by gas into a gas component and an oil component. The oil catching section 3 includes a non-woven fabric disk-shaped filter 17 disposed to face the nozzle section 9, and a resin-made disk-shaped filter support 18 that supports the filter 17. As shown in FIG. 4A, the filter support 18 has a plurality (four in the figure) of flow passages 19 through which blow-by gas flows. Further, the filter support 18 includes a central support portion 18 a that supports the central portion of the filter 17. Further, the filter 17 is formed in a size that does not block the flow passage 19 of the filter support 18.

  In this embodiment, the filter 17 having a relatively low density of nonwoven fabric and the filter support 18 that supports the filter 17 are used. However, the present invention is not limited to this. For example, as shown in FIG. When a relatively high-density filter 17 ′ is employed, a filter support 18 ′ in which a plurality of (eight in the figure) flow passages 19 ′ through which blow-by gas flows is formed on the outer peripheral side and the central side is employed. May be. In this case, the filter 17 ′ is sized so as not to block the flow passage 19 ′ on the outer peripheral side of the filter support 18.

  Furthermore, in the present embodiment, the non-woven filter 17 has been exemplified, but the present invention is not limited thereto. For example, the filter material may be a non-woven fabric, a fiber body such as paper, woven fabric, or knitted fabric, or a resin foam body such as urethane. And a resin porous film.

  Here, the oil trap 3 is sandwiched between the upstream half 5 and the downstream half 6. Specifically, the outer peripheral side of the filter support 18 is sandwiched between the stepped portion 12 of the upstream half 5 and the distal end side of the rib 11 and the flange portion 15 of the downstream half 6. Further, the filter 17 is interposed between the step portion 11 a of the rib 11 and the filter support 18. The bottom surface (inner peripheral surface) of the upstream half member 5, the bottom surface of the flow passage 19, and the bottom surface (inner peripheral surface) of the downstream half member 6 have substantially the same height level for oil discharge. (See FIG. 1).

(2) Manufacturing method of oil mist separator Next, the manufacturing method of the oil mist separator 1 of the said structure is demonstrated. As shown in FIG. 5, a plurality of types (two types in the drawing) of downstream halves 6A and 6B having different longitudinal sectional areas S1 and S2 of the internal space are prepared as the downstream halves 6. An oil mist separator is formed by joining one type of the downstream half 6 and the upstream half 5 selected from the plurality of types of the downstream halves 6A and 6B with the oil capturing part 3 interposed therebetween. 1 is obtained. Regardless of which of the downstream halves 6A and 6B is selected and used, the filter support 18 includes the ribs 11 of the upstream halves 5 and the flanges 15 of the downstream halves 6A and 6B. Is sandwiched between.

(3) Operation of Oil Mist Separator Next, the operation of the oil mist separator 1 having the above configuration will be described. As shown in FIG. 1, blow-by gas G generated in the internal combustion engine flows into the housing 2 from the inflow port 8 and collides with the filter 17 so that the oil O is captured. The blow-by gas G in which the oil O has been captured reaches the downstream half 6 through the flow passage 19 of the filter support 18 and flows out of the housing 2 through the outflow port 13. Further, the oil O captured by the filter 17 is accumulated in the lower part of the upstream half 5, passes through the lower flow passage 19 of the filter support 18, reaches the downstream half 6, and reaches the discharge port 14. From the housing 2 to the outside.

(4) Effects of the Embodiment As described above, according to the oil mist separator 1 of the present embodiment, the housing 2 includes the cylindrical upstream half 5 in which the blow-by gas inlet 8 is formed, and the flow of blow-by gas. A cylindrical downstream half 6 formed with an outlet 13 and an oil outlet 14 captured by the oil trap 3 is joined in the axial direction, and the oil trap 3 is an upstream half. It is sandwiched between the split 5 and the downstream half 6. Thus, if a plurality of types are prepared as the upstream half 5 and / or the downstream half 6, the optimum upstream half 5 and / or downstream half according to the performance of the internal combustion engine. 6 can be selected and used, and the oil capturing section 3 having the same outer shape can be used in common. Therefore, the design freedom of the oil mist separator 1 is increased.

  In the present embodiment, the upstream half 5 is formed with a nozzle portion 9 for increasing the flow rate of blow-by gas, and the oil catching portion 3 includes a filter 17 disposed opposite to the nozzle portion 9, a filter 17 and a filter support 18 having a blow-by gas flow passage 19 formed therein. As a result, the blow-by gas is accelerated in the upstream half 5 by the nozzle portion 9 and collides with the filter 17 so that the oil is captured, passes through the flow passage 19 of the filter support 18, and passes through the downstream half. It reaches into the split 6. Thereby, oil can be captured while clogging the filter 17 is suppressed. Moreover, since the nozzle part 9 is integrally formed in the upstream half body 5, the number of parts can be reduced and it can be set as a simple structure. As a result, a plurality of types can be easily prepared as the downstream half 6 having different longitudinal sectional areas S1 and S2 of the internal space and the upstream half 5 having different longitudinal sectional areas of the nozzle portion 9.

  Further, in the present embodiment, the rib 11 is formed so as to protrude from the inner surface side of the upstream half 5, and the filter support 18 is connected to the joint end side of the upstream half 5 and / or the rib 11. The filter 17 is interposed between the step portion 11 a formed in the rib 11 and the filter support 18. Thereby, even if the relatively soft filter 17 is employed, it can be reliably held. Further, since the rib 11 for holding the filter 17 together with the nozzle portion 9 is integrally formed in the upstream half 5, the number of parts can be reduced and a simpler structure can be achieved. As a result, a plurality of types can be more easily prepared as the downstream half 6 having different longitudinal sectional areas S1 and S2 of the internal space and the upstream half 5 having different longitudinal sectional areas of the nozzle portion 9.

  In the present embodiment, flange portions 10 and 15 are formed on the joining end sides of the upstream half 5 and the downstream half 6 so as to be in contact with each other. 5 is formed with an annular stepped portion 12, and the filter support 18 is sandwiched between the stepped portion 12 and / or the rib 11 and the flange portion 15 of the downstream half 6. . Thereby, a plurality of types can be more easily prepared as the downstream half 6 having different longitudinal sectional areas S1 and S2 of the internal space and the upstream half 5 having different longitudinal sectional areas of the nozzle portion 9.

  In the present embodiment, the upstream half 5 and the downstream half 6 are formed in a cylindrical shape, so that the degree of freedom of the mounting angle of the oil mist separator 1 with respect to the internal combustion engine is increased.

  Further, in the present embodiment, since the outer shape of the upstream half 5 does not change, the same shape can be adopted as an attachment clamp for attaching the oil mist separator 1 to the internal combustion engine.

  In addition, according to the method of manufacturing the oil mist separator of the present embodiment, a plurality of types are prepared as the downstream halves 6, and one type of the downstream selected from the plurality of types of the downstream halves 6A and 6B. The oil mist separator 1 is obtained by joining the half body 6 and the upstream half body 5 with the oil capturing part 3 interposed therebetween. Thereby, the optimal downstream halves 6A and 6B can be selected and used according to the performance of the internal combustion engine and the like, and the oil capturing section 3 having the same outer shape can be used in common. Therefore, the design freedom of the oil mist separator 1 is increased. In particular, in this embodiment, since only one type of the upstream half 5 is provided, the upstream half 5 can be shared in addition to the oil trap 3.

  Further, in the present embodiment, a plurality of types having different longitudinal sectional areas S1 and S2 of the internal space are prepared as the downstream halves 6. Thereby, the optimal downstream halves 6A and 6B can be easily selected in accordance with the performance of the internal combustion engine (particularly, engine displacement).

<Example 2>
(1) Configuration of Oil Mist Separator As shown in FIGS. 6 to 8, an oil mist separator 31 according to the second embodiment includes a housing 32 provided separately from a main body of an internal combustion engine (not shown), and the housing 32. And an oil catcher 33 that catches oil contained in blow-by gas generated in the internal combustion engine. The housing 32 is made of a resin-made cylindrical upstream half 35 and downstream half 36 joined in the axial direction.

  The upstream half body 35 has a bottom wall 35a and a cylindrical peripheral wall 35b extending in the axial direction from the outer peripheral edge side of the bottom wall 35a. A cylindrical inflow port 38 extending outward in the axial direction is formed in the bottom wall 35a. The inflow port 38 allows blow-by gas generated in the internal combustion engine to flow into the housing 32. A flange portion 40 that extends in the centrifugal direction is formed on the open end side of the peripheral wall 35b (that is, the joint end side of the upstream half body 5). In addition, an annular step portion 41 for holding a filter support described later is formed on the open end side of the peripheral wall 35b.

  The downstream half halves 36 have a bottom wall 36a and a cylindrical peripheral wall 36b extending in the axial direction from the outer peripheral edge side of the bottom wall 36a. A cylindrical outlet 43 extending outward in the axial direction is formed in the bottom wall 36a. The outflow port 43 causes the blow-by gas, in which oil is captured by the oil capturing unit 33, to flow out of the housing 32. Moreover, the cylindrical discharge port 44 extended below is formed in the surrounding wall 36b. The discharge port 44 discharges the oil captured by the oil capturing part 33 to the outside of the housing 32. Further, a flange portion 45 that extends in the centrifugal direction is formed on the open end side of the peripheral wall 36b (that is, the joint end side of the downstream half 6). The flanges 40 and 45 of the upstream half 35 and the downstream half 36 are brought into contact with each other and joined by joining means such as vibration welding, laser welding, adhesion, and screws.

  In the present embodiment, the inlet 38 is connected to the other end of a hose (not shown) connected to the crank chamber or cylinder head cover of the internal combustion engine at one end, and the outlet 43 is connected to the internal combustion engine at one end. The other end of a hose (not shown) connected to the intake side is connected. Further, the oil mist separator 31 is attached to a predetermined location in the internal combustion engine or the engine room by gripping the outer periphery of the upstream half body 35 with an attachment clamp (not shown).

  The oil trap 33 has a gas-liquid separation function for separating the blow-by gas into a gas component and an oil component. The oil catcher 33 includes a disk-shaped filter 47 made of nonwoven fabric and a resin-made disk-shaped filter support 48 that supports the filter 47. As shown in FIG. 7, the filter support 48 is formed with a flow passage 49 through which blow-by gas is circulated in the center thereof. A filter 47 is attached to the surface of the filter support 48 with an adhesive or a fixing structure so as to close the flow passage 49.

  In the present embodiment, the non-woven filter 47 is exemplified, but the filter 47 is not limited thereto. For example, the filter material may be a non-woven fabric, a fiber body such as paper, woven fabric, or knitted fabric, or a resin foam body such as urethane. And a resin porous film.

  Here, the oil catcher 33 is sandwiched between the upstream half 35 and the downstream half 36. Specifically, the outer periphery of the filter support 48 is sandwiched between the step portion 41 of the upstream half 35 and the flange 45 of the downstream half 36.

(2) Manufacturing method of oil mist separator Next, the manufacturing method of the oil mist separator 31 of the said structure is demonstrated. As shown in FIG. 9, a plurality of types (two types in the drawing) of downstream halves 36A and 36B having different longitudinal sectional areas S1 and S2 of the internal space are prepared as the downstream halves 36. An oil mist separator is formed by joining one type of downstream half 36 and an upstream half 35 selected from a plurality of types of downstream halves 36A and 36B with the oil catching portion 33 interposed therebetween. 31 is obtained. Note that, regardless of which of the downstream halves 36A and 36B is selected and used, the filter support 48 has the stepped portion 41 of the upstream half halves 35 and the flange 45 of the downstream halves 6A and 6B. Is sandwiched between.

(3) Operation of Oil Mist Separator Next, the operation of the oil mist separator 31 having the above configuration will be described. As shown in FIG. 6, blow-by gas G generated in the internal combustion engine flows into the housing 32 from the inlet 38 and collides with the filter 47 so that the oil O is captured. The blow-by gas G from which the oil O has been captured passes through the flow passage 49 of the filter support 48, reaches the downstream half 36, and flows out of the housing 32 through the outlet 43. On the other hand, the oil O captured by the filter 47 is discharged out of the housing 32 through the discharge port 44 of the downstream half 36.

(4) Effects of the Embodiment As described above, according to the oil mist separator 31 of the present embodiment, the housing 32 includes the cylindrical upstream half 35 in which the blow-by gas inlet 38 is formed, and the flow of the blow-by gas. A cylindrical downstream half 36 formed with an outlet 43 and an oil discharge port 44 captured by the oil trap 33 is joined in the axial direction. The oil trap 33 is formed of an upstream half. It is sandwiched between the split body 35 and the downstream half split body 36. Accordingly, if a plurality of types of upstream halves 35 and / or downstream halves 36 are prepared, the most suitable upstream halves 35 and / or downstream halves according to the performance of the internal combustion engine. The body 36 can be selected and used, and the oil capturing part 33 having the same outer shape can be used in common. Therefore, the design freedom of the oil mist separator 31 is increased.

  Further, in the present embodiment, the oil trapping portion 33 has an outer peripheral portion sandwiched between the upstream half portion 35 and the downstream half portion 36 and a filter support 48 in which a blow-by gas flow passage 49 is formed. And a filter 47 attached to the filter support 48 so as to close the flow passage 49. As a result, substantially the entire amount of blow-by gas flowing into the housing 32 passes through the filter 47 and the oil is captured. Therefore, oil capture efficiency can be increased.

  Further, in the present embodiment, flange portions 40 and 45 are formed on the joining end sides of the upstream-side half 35 and the downstream-side half 36 so as to come into contact with each other and are joined to each other. An annular step 41 is formed on the joint end side of 35, and the filter support 48 is sandwiched between the step 41 and the flange 45 of the downstream half 36. Thereby, a plurality of types can be easily prepared as the downstream halves 36 having different longitudinal sectional areas S1 and S2 of the internal space.

  Further, in the present embodiment, since the upstream half body 35 and the downstream half body 36 are formed in a cylindrical shape, the degree of freedom of the mounting angle of the oil mist separator 31 with respect to the internal combustion engine is increased.

  Further, in this embodiment, since the outer shape of the upstream half 35 is not changed, the same shape can be adopted as an attachment clamp for attaching the oil mist separator 31 to the internal combustion engine.

  Further, according to the method of manufacturing the oil mist separator 31 of the present embodiment, a plurality of types are prepared as the downstream half halves 36, and one type of downstream selected from the plurality of types of downstream halves 36A, 36B. The oil mist separator 31 is obtained by joining the side half 36 and the upstream half 35 with the oil catching portion 33 interposed therebetween. Thereby, the optimal downstream halves 36A and 36B can be selected and used according to the performance of the internal combustion engine, and the oil trapping portion 33 having the same outer shape can be used in common. Therefore, the design freedom of the oil mist separator 31 is increased. In particular, in the present embodiment, since only one type of the upstream half body 35 is provided, the upstream half body 35 can be shared in addition to the oil catching portion 33.

  Further, in the present embodiment, a plurality of types having different longitudinal sectional areas S1 and S2 of the internal space are prepared as the downstream halves 36. Thereby, the optimal downstream half 36 can be easily selected according to the performance of the internal combustion engine (particularly, engine displacement).

  In the present invention, the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention depending on the purpose and application. That is, in the above-described embodiment, one type is prepared as the upstream halves 3 and 35 and a plurality of types are prepared as the downstream halves 6 and 36 and the oil mist separators 1 and 31 are assembled. For example, as shown in FIG. 10, a plurality of types (for example, a plurality of types having different longitudinal sectional areas S3 and S4 of the nozzle portion 9) are prepared as shown in FIG. One type of halved body 6 may be prepared and the oil mist separator 1 may be assembled. In this case, an oil mist is formed by joining one type of the upstream half 5 and the downstream half 6 selected from a plurality of types of the upstream halves 5A and 5B with the oil capturing part 3 interposed therebetween. Separator 1 is obtained.

  Further, for example, as shown in FIG. 11, a plurality of types (for example, a plurality of types having different vertical cross-sectional areas S3 and S4 of the nozzle portion 9) are prepared as the upstream half 50 and the downstream half 6 is prepared. The oil mist separator 1 may be assembled by preparing a plurality of types (for example, a plurality of types having different longitudinal sectional areas S1 and S2 of the internal space). In this case, one type selected from a plurality of types of upstream halves 5A and 5B and one type selected from a plurality of types of downstream halves 5A and 6B. The oil mist separator 1 is obtained by joining the downstream half halves 6 with the oil catching portion 3 interposed therebetween.

  Moreover, in the said Example, you may make it prepare multiple types from which the longitudinal cross-sectional area of internal space differs as the upstream halves 3,35.

  Moreover, in the said Example, although the filter 17 clamped the non-adhesive filter support body 18 between the upstream half body 5 and the downstream half body 6, it is not limited to this, For example, The filter support 18 to which the filter 17 is bonded may be sandwiched between the upstream half 5 and the downstream half 6.

  Moreover, in the said Example, although the oil capture | acquisition part 3 provided with the filter 17 and the filter support body 18 was employ | adopted and the blowby gas from the nozzle part 9 collided with the filter 17, it capture | acquires oil, However, it is limited to this Alternatively, for example, an oil catching section that includes an impactor plate and that does not include a filter may be employed so that blow-by gas from the nozzle section collides with the impactor plate to capture oil.

  In the above embodiment, the cylindrical upstream halves 5 and 35 and the downstream halves 6 and 36 are exemplified, but the present invention is not limited thereto. For example, the rectangular upstream halves and A downstream half may be used.

  Furthermore, in the above embodiment, two types of upstream halves 5 and downstream halves 6 and 36 are prepared and the oil mist separators 1 and 31 are assembled. Three or more types of upstream halves and downstream halves may be prepared and the oil mist separator may be assembled.

  The foregoing examples are for illustrative purposes only and are not to be construed as limiting the invention. Although the invention has been described with reference to exemplary embodiments, it is to be understood that the language used in the description and illustration of the invention is illustrative and exemplary rather than limiting. As detailed herein, changes may be made in its form within the scope of the appended claims without departing from the scope or spirit of the invention. Although specific structures, materials and examples have been referred to in the detailed description of the invention herein, it is not intended to limit the invention to the disclosure herein, but rather, the invention is claimed. It covers all functionally equivalent structures, methods and uses within the scope.

  The present invention is not limited to the embodiments described in detail above, and various modifications or changes can be made within the scope of the claims of the present invention.

  It is widely used as a technique for capturing oil contained in blow-by gas generated in an internal combustion engine.

  DESCRIPTION OF SYMBOLS 1,31; Oil mist separator, 2,32; Housing, 3,33; Oil trapping part, 5,35; Upstream half split, 6,36; Downstream half split, 8,38; Nozzle part, 11; rib, 11a; step part, 13, 43; outlet, 14, 44; outlet, 17, 17 ', 47; filter, 18, 18', 48; filter support, 19, 19 ', 49;

Claims (5)

An oil mist separator comprising: a housing provided separately from a main body of the internal combustion engine; and an oil capturing portion that is contained in the housing and captures oil contained in blow-by gas generated in the internal combustion engine,
The housing has a cylindrical upstream half formed with a blow-by gas inlet, and a cylindrical downstream formed with a blow-by gas outlet and an oil outlet captured by the oil trap. It is composed by joining the halved body in the axial direction,
An oil mist separator, wherein the oil catching portion is sandwiched between the upstream half and the downstream half.   The upstream half is formed with a nozzle part for increasing the flow rate of blow-by gas, and the oil trapping part supports a filter disposed opposite to the nozzle part, supports the filter, and distributes the blow-by gas. The oil mist separator according to claim 1, further comprising: a filter support having a path formed therein. A rib protrudes from the inner surface of the upstream half,
The filter support is sandwiched between the joint end side of the upstream half and / or the rib and the joint end side of the downstream half, and the filter has a step formed in the rib. The oil mist separator according to claim 2, which is interposed between a part and the filter support. A method for producing an oil mist separator according to any one of claims 1 to 3,
Prepare multiple types as the downstream halves,
An oil mist separator is obtained by joining one type of the downstream side half body selected from among the plurality of types of the downstream side half body and the upstream side half body with the oil trapping portion interposed therebetween. A method for producing an oil mist separator. A method for producing an oil mist separator according to any one of claims 1 to 3,
Prepare multiple types as the upstream halves,
An oil mist separator is obtained by joining one type of the upstream side half body and the downstream side half body selected from among a plurality of types of the upstream side half body with the oil trapping portion interposed therebetween. A method for producing an oil mist separator.

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