JP2016217342A - Passage structure of blow-by gas and manufacturing method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a passage structure of blow-by gas capable of improving separation efficiency of an oil component contained in a blow-by gas.SOLUTION: A passage structure of blow-by gas is provided in a separator chamber S formed between a cylinder head cover 2 and a baffle plate 3 joined to the cylinder head cover. Then, on an opposing surface of one member out of the cylinder head cover and the baffle plate, first ribs 11a, 12a, 13a are provided, and on the opposing surface of the other member, second ribs 11b, 12b, 13b are provided at the positions on the upstream side of the blow-by gas flow of the first ribs and adjacent to gaps g formed between the tip side of the first rib and the opposing surface of the other member. Furthermore, the height of the second ribs is a value greater than the height of the gaps so as to prevent passing of the blow-by gas at the gaps.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a blowby gas passage structure and a method for manufacturing the same, and more particularly, to a blowby gas provided in a separator chamber formed between a cylinder head cover and a baffle plate joined to the cylinder head cover by vibration welding. The present invention relates to a passage structure and a manufacturing method thereof.

  As a conventional oil mist separator, a separator provided in a separator chamber formed between a cylinder head cover and a baffle plate joined to the cylinder head cover by vibration welding is generally known (for example, see Patent Document 1). In this conventional oil mist separator, for example, as shown in FIGS. 5 and 6, blowby gas is bypassed (meandering) in the plane direction in the separator chamber S on the surface of the cylinder head cover 102 and / or the baffle plate 103. The detour rib 111 is raised. The blow-by gas introduced into the separator chamber S from the introduction port 105 is diverted by the bypass rib 111, and the oil component in the blow-by gas is captured by gravity settling and collision. Thereafter, the blow-by gas from which the oil component has been separated is discharged from the separator chamber S by the PCV valve 107 provided at the discharge port 106, and is carried to the combustion chamber of the engine via the intake manifold and the like.

  Here, in the conventional oil mist separator, in order to avoid interference (that is, vibration welding) between the front end side of the bypass rib 111 and the surface of the mating member (cylinder head cover 102 or baffle plate 103). The gap g is formed. This is because the following problems occur when the bypass rib 111 interferes with the surface of the mating member. For example, vibration welding burrs (foreign matter) are generated, or setting of the hidden shape of the vibration welding burrs becomes difficult. Further, when the bypass rib 111 is high and the rigidity is low, the bypass rib 111 is greatly shaken by vibration during vibration welding, the resin is not heated, and welding failure occurs.

JP 2011-58433 A

  However, in the conventional oil mist separator, a gap g is formed between the tip side of the bypass rib 111 and the surface of the mating member, so that part of the blow-by gas passes through the gap g. As a result, the shortcut channel 119 is generated. Therefore, the blow-by gas flow path 120 as designed is not obtained, and the blow-by gas cannot be sufficiently bypassed, and the separation efficiency of the oil component in the blow-by gas is lowered.

  Further, in the conventional oil mist separator, when the negative pressure in the separator chamber S is large and the PCV valve 107 (discharge port 106) and the oil dropping hole 108 are arranged in the vicinity, blow-by gas flows from the oil dropping hole 108 into the separator chamber. It is sucked into S and flows to the PCV valve 107. Therefore, for example, it is conceivable to provide a shielding rib on the surface of the cylinder head cover 102 or the baffle plate 103 to block the flow of blow-by gas from the oil drain hole 108 toward the discharge port 106. However, even in the case of the shielding rib, it is necessary to form a gap g for avoiding interference between the front end side and the surface of the mating member in the same manner as the bypass rib 111 described above. Therefore, a part of the blow-by gas passes through the gap g and a shortcut channel is generated. As a result, the blocking effect of the blow-by gas is lowered, and the separation efficiency of the oil component in the blow-by gas is also lowered.

  This invention is made | formed in view of the said present condition, and it aims at providing the channel | path structure of the blowby gas which can improve the isolation | separation efficiency of the oil component contained in blowby gas, and its manufacturing method.

In order to solve the above problem, the invention according to claim 1 is provided in a separator chamber formed between a cylinder head cover and a baffle plate joined to the cylinder head cover, and oil components are separated in the separator chamber. A blow-by gas passage structure constituting a blow-by gas passage introduced for the cylinder head cover, wherein each of the cylinder head cover and the baffle plate includes a facing surface facing the cylinder head cover in the vertical direction, and the cylinder head cover The first rib is provided on the facing surface of one member of the baffle plate, and the first rib is disposed on the facing surface of the other member on the upstream side of the blow-by gas flow of the first rib. A second rib at a position adjacent to a gap formed between the front end side of the second member and the opposing surface of the other member Provided, the height of the second rib, and summarized in that the there is a height above the value of the gap so as to prevent the passage of the blow-by gas in the gap.
According to a second aspect of the present invention, in the first aspect of the invention, the first rib and the second rib for detouring are provided for diverting blowby gas in the plane direction of the cylinder head cover in the separator chamber. Is the gist.
According to a third aspect of the present invention, in the second aspect of the present invention, the first rib and the second rib for detouring are arranged opposite to an inlet for introducing blow-by gas into the separator chamber. This is the gist.
According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the blow-by gas is discharged from the separator chamber through an oil pit that discharges the oil component separated from the separator chamber. The gist is to include the first rib and the second rib for shielding to block the flow of blow-by gas toward the discharge port.
According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the second rib is inclined so as to be separated from the gap in the vertical direction as the first rib is approached. The gist is to provide an inclined surface.
In order to solve the above problem, an invention according to claim 6 is a method of manufacturing a blow-by gas passage structure according to any one of claims 1 to 5, wherein the cylinder head cover, the baffle plate, Are joined by vibration welding so that the second rib is formed on the upstream side of the flow of blow-by gas of the first rib and between the tip side of the first rib and the opposing surface of the other member. The main point is that it is arranged at a position adjacent to the gap.

According to the blow-by gas passage structure of the present invention, each of the cylinder head cover and the baffle plate includes a facing surface facing the vertical direction of the cylinder head cover, and on the facing surface of one member of the cylinder head cover and the baffle plate, A first rib is provided, and a gap formed on the facing surface of the other member on the upstream side of the blow-by gas flow of the first rib and between the tip side of the first rib and the facing surface of the other member. A second rib is provided at a position adjacent to. And the height of the 2nd rib is made into the value more than the height of a crevice so that passage of blowby gas in a crevice may be prevented. Thereby, the passage of blow-by gas in the gap is prevented by the first rib and the second rib. As a result, the separation efficiency of the oil component contained in the blow-by gas can be improved.
Further, when the bypass first rib and the second rib are provided, the blow-by gas is bypassed in the plane direction of the cylinder head cover in the separator chamber by the bypass first and second ribs, and the oil in the blow-by gas The components are separated. Furthermore, since the bypass first and second ribs prevent the blow-by gas from passing through the gap, a blow-by gas flow path as designed can be realized, and the blow-by gas can be sufficiently bypassed.
Further, when the first rib and the second rib for detouring are arranged to face the introduction port, the blow-by gas having a high flow velocity introduced from the introduction port into the separator chamber is used for the first and second detouring operations. By colliding with the second rib, the oil component in the blow-by gas is effectively separated. Furthermore, the bypass first and second ribs prevent passage of blow-by gas having a high flow velocity in the gap.
When the first rib and the second rib for shielding are provided, the flow of blow-by gas from the oil drain hole to the discharge port is blocked by the first and second ribs for shielding. Moreover, since the passage of the blow-by gas through the gap is prevented by the first and second ribs for shielding, the shielding effect of the blow-by gas is enhanced.
Further, when the second rib has an inclined surface, the blow-by gas is guided in the vertical direction away from the gap by the inclined surface of the second rib. Therefore, passage of blow-by gas in the gap can be prevented more reliably.
According to the blowby gas passage structure manufacturing method of the present invention, the second rib is formed upstream of the blowby gas flow of the first rib by joining the cylinder head cover and the baffle plate by vibration welding. And it arrange | positions in the position adjacent to the clearance gap formed between the front end side of the said 1st rib, and the opposing surface of the said other member. Thereby, the passage of blow-by gas in the gap is prevented by the first rib and the second rib. As a result, the separation efficiency of the oil component contained in the blow-by gas can be improved.

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.
It is a principal part back view of a cylinder head cover provided with the passage structure of blowby gas concerning Example 1. FIG. It is the II-II sectional view taken on the line of FIG. FIG. 6 is a rear view of a main part of a cylinder head cover including a blow-by gas passage structure according to a second embodiment. It is the IV-IV sectional view taken on the line of FIG. It is a principal part back view of a cylinder head cover provided with the conventional oil mist separator. FIG. 6 is a sectional view taken along line VI-VI in FIG. 5.

  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.

<Blowby gas passage structure>
The blow-by gas passage structure according to this embodiment is provided in a separator chamber (S) formed between a cylinder head cover (2) and a baffle plate (3) joined to the cylinder head cover by vibration welding. 1 is a blow-by gas passage structure (1, 1 ′) constituting a blow-by gas passage introduced into the separator chamber for separation of oil components (see, for example, FIGS. 1 to 4). Each of the cylinder head cover (2) and the baffle plate (3) includes opposing surfaces (2a, 3a) facing the vertical direction (P) of the cylinder head cover, and one member of the cylinder head cover and the baffle plate. The first rib (11a, 12a, 13a, 23a) is provided on the opposite surface of the first member, and the opposite surface of the other member is on the upstream side of the flow of blow-by gas of the first rib and on the tip side of the first rib. The second rib (11b, 12b, 13b, 23b) is provided at a position adjacent to the gap (g) formed between the second member and the opposite surface of the other member. Furthermore, the height of the second rib (11b, 12b, 13b, 23b) is set to a value equal to or higher than the height of the gap (g) so as to prevent the passage of blow-by gas through the gap (g).

  The term “prevention” is intended to mean a form that prevents the passage of blow-by gas through the gap completely or at a considerable rate. For example, the first rib and the second rib can prevent blow-by gas having a flow rate of 80% or more of the total flow rate of blow-by gas introduced into the separator chamber from passing through the gap. The adjacent distance between the first and second ribs (d1; see FIG. 2 and FIG. 4) is such that the ribs do not interfere with each other during vibration welding between the cylinder head cover and the baffle plate and the blow-by gas passes through the gap. There is no particular limitation as long as it can be prevented. As this adjacent space | interval (d1), 1-10 mm (preferably 1-5 mm, Furthermore, 2-3 mm) etc. can be mentioned, for example. Further, in the case of the above-described embodiment, for example, the cylinder head cover (2) is formed in a box shape with the bottom side open, and the baffle plate (3) is closed on the bottom side with respect to the cylinder head cover. Can be joined.

  As the blow-by gas passage structure according to the present embodiment, for example, first bypass ribs (11a, 12a, 12a) for bypassing the blow-by gas in the plane direction of the cylinder head cover (2) in the separator chamber (S). 13a) and a form provided with the 2nd rib (11b, 12b, 13b) (for example, refer to FIGS. 1-4) etc. can be mentioned.

  In the case of the above-mentioned form, for example, the first rib (11a) and the second rib (11b) for detouring are arranged to face the inlet (5) for introducing blowby gas into the separator chamber (S). (See, for example, FIG. 2). In this case, for example, the cylinder head cover (2) has a pipe-shaped introduction port (5) formed so that one end side thereof opens laterally into the separator chamber (S), and the first rib (11a for detouring) ) And the second rib (11b) can be arranged to face the opening on one end side of the introduction port.

  As a blow-by gas passage structure according to the present embodiment, for example, blow-by gas is discharged from the separator chamber (S) through an oil pit (8) for discharging the oil component separated from the separator chamber (S). The form (for example, refer FIG.3, FIG.4 etc.) provided with the 1st rib (23a) for shielding and the 2nd rib (23b) for shielding the flow of blow-by gas which goes to the discharge port (6) can be mentioned. .

  As a blow-by gas passage structure according to the present embodiment, for example, the second rib (11b) is inclined such that the first rib (11a) approaches the first rib (11a) so as to be separated from the gap in the vertical direction (16). (For example, see FIG. 2 etc.).

<Blowby gas passage structure manufacturing method>
The blowby gas passage structure manufacturing method according to the present embodiment is a blowby gas passage structure (1, 1 ′) manufacturing method according to the above embodiment, wherein a cylinder head cover (2) and a baffle plate (3) are provided. By joining by vibration welding, the second ribs (11b, 12b, 13b, 23b) are located upstream of the flow of blow-by gas of the first ribs (11a, 12a, 13a, 23a) and the tip side of the first ribs. It arrange | positions in the position adjacent to the clearance gap (g) formed between the opposing surface of the other member (for example, refer FIGS. 1-4).

  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 Blowby Gas Passage Structure As shown in FIGS. 1 and 2, the blowby gas passage structure 1 according to this embodiment includes a separator chamber S formed between a cylinder head cover 2 and a baffle plate 3. It is provided within. The blow-by gas passage structure 1 constitutes a blow-by gas passage introduced into the separator chamber S.

  The cylinder head cover 2 is made of a resin material and is formed in a box shape with the bottom side opened. The baffle plate 3 is made of a resin material, and is joined to the cylinder head cover 2 by vibration welding so as to close the bottom side thereof. Each of the cylinder head cover 2 and the baffle plate 3 includes opposing surfaces 2 a and 3 a that face the cylinder head cover 2 in the vertical direction P. The plane direction substantially perpendicular to the vertical direction P of the cylinder head cover 2 is defined as the plane direction of the cylinder head cover 2.

  The cylinder head cover 2 is provided with a substantially L-shaped inlet 5 for introducing blow-by gas generated in the engine into the separator chamber S. Further, the cylinder head cover 2 is provided with a discharge port 6 for discharging blow-by gas from the separator chamber S. A PCV valve (Positive Crankcase Ventilation valve) 7 for controlling the discharge amount of blow-by gas is attached to the discharge port 6. Further, the baffle plate 3 is formed with an oil dropping hole 8 for returning the oil collected in the separator chamber S to the engine side.

  The blow-by gas passage structure 1 includes detour first ribs 11a, 12a, 13a, second ribs 11b, 12b, 13b, and detour ribs 14. The detour first ribs 11 a, 12 a, 13 a and the second ribs 11 b, 12 b, 13 b are ribs for detouring (meandering) blow-by gas in the plane direction of the cylinder head cover 2 in the separator chamber S. The bypass rib 14 is a rib for bypassing (meandering) the blow-by gas in the vertical direction P of the cylinder head cover 2 in the separator chamber S. And by bypassing blowby gas by each of these ribs, the oil component (oil mist) in blowby gas is collected by weight settling and a collision with each rib.

  The detour first rib 11 a is raised from the facing surface 3 a (that is, the bottom surface 3 a) of the baffle plate 3. The first rib 11a is formed in a plate shape whose tip side extends to the vicinity of the facing surface 2a of the cylinder head cover 2 (that is, the ceiling surface 2a). A gap g having a predetermined height interval is formed between the distal end side of the first rib 11 a and the facing surface 2 a of the cylinder head cover 2.

  The bypass second rib 11b is provided on the opposed surface 2a of the cylinder head cover 2 at a position adjacent to the gap g on the upstream side of the flow of blow-by gas of the first rib 11a. The adjacent distance d1 between the first rib 11a and the second rib 11b is about 3 mm. The second rib 11b is formed in a protruding shape so as to cover the gap g. Further, the height of the second rib 11b is set to a value larger than the height of the gap g. That is, the second rib 11b is opposed to the front end side of the first rib 11a in the plane direction of the cylinder head cover 2 so as to overlap in the vertical direction P of the cylinder head cover 2. Further, the first rib 11 a and the second rib 11 b extend in a linear shape that is substantially parallel to each other in the plane direction of the cylinder head cover 2.

  The detour first rib 11 a and second rib 11 b are arranged so as to face one end side of the introduction port 5. Furthermore, the 2nd rib 11b is provided with the inclined surface 16 inclined so that it might leave | separate downward from the clearance gap g as it approaches the 1st rib 11a.

  The bypass first rib 12 a is raised from the facing surface 2 a of the cylinder head cover 2. The first rib 12 a is formed in a plate shape whose tip side extends to the vicinity of the facing surface 3 a of the baffle plate 3. A gap g having a predetermined height interval is formed between the front end side of the first rib 12 a and the facing surface 3 a of the baffle plate 3.

  The detouring second rib 12b is provided on the opposing surface 3a of the baffle plate 3 at a position adjacent to the gap g on the upstream side of the flow of the blow-by gas of the first rib 12a. The adjacent distance d1 between the first rib 12a and the second rib 12b is about 3 mm. The second rib 12b is formed in a protruding shape so as to cover the gap g. Further, the height of the second rib 12b is set to a value larger than the height of the gap g. That is, the second rib 12b is opposed to the front end side of the first rib 12a in the plane direction of the cylinder head cover 2 so as to overlap in the vertical direction P of the cylinder head cover 2. Further, the first and second ribs 12 a and 12 b extend in a linear shape that is substantially parallel to each other in the plane direction of the cylinder head cover 2.

  The bypass first rib 13 a is raised from the facing surface 2 a of the cylinder head cover 2. The first rib 13 a is formed in a plate shape whose leading end extends to an intermediate portion of the facing distance between the cylinder head cover 2 and the baffle plate 3. A gap g having a predetermined height interval is formed between the front end side of the first rib 13 a and the facing surface 3 a of the baffle plate 3.

  The bypass second rib 13 b is raised from the facing surface 3 a of the baffle plate 3. The second rib 13b is provided at a position upstream of the flow of blow-by gas of the first rib 13a and adjacent to the gap g. The adjacent distance d1 between the first rib 13a and the second rib 13b is about 3 mm. Further, the second rib 13 b is formed in a plate shape whose tip side extends to an intermediate portion of the facing distance between the cylinder head cover 2 and the baffle plate 3. The height of the second rib 13b is set to a value larger than the height of the gap g. That is, the tip ends of the first rib 13 a and the second rib 13 b are opposed to the plane direction of the cylinder head cover 2 so as to overlap in the vertical direction P of the cylinder head cover 2. Further, the first rib 13 a and the second rib 13 b extend in a linear shape that is substantially parallel to each other in the plane direction of the cylinder head cover 2.

(2) Action of Blowby Gas Passage Structure Next, the action of the blowby gas passage structure 1 configured as described above will be described. The blow-by gas introduced into the separator chamber S from the introduction port 5 is detoured in the plane direction of the cylinder head cover 2 by the first ribs 11a, 12a, 13a and the second ribs 11b, 12b, 13b for detour, The oil component in the blow-by gas is captured by the collision. Next, the blow-by gas is detoured in the vertical direction P of the cylinder head cover 2 by the bypass rib 14, and the oil component in the blow-by gas is captured by gravity settling and collision. Thereafter, the blow-by gas from which the oil component has been sufficiently separated is discharged from the separator chamber S by the PCV valve 7 provided at the discharge port 6, and is carried to the combustion chamber of the engine via the intake manifold. On the other hand, the oil collected in the separator chamber S is returned to the engine side through the oil dropping hole 8.

(3) Effects of the Embodiment According to the blowby gas passage structure 1 of the present embodiment, each of the cylinder head cover 2 and the baffle plate 3 includes the opposing surfaces 2a and 3a facing the vertical direction P of the cylinder head cover 2, and the cylinder The first ribs 11a, 12a, 13a are provided on the facing surface of one member of the head cover 2 and the baffle plate 3, and the blow-by gas of the first ribs 11a, 12a, 13a is provided on the facing surface of the other member. The second ribs 11b, 12b, 13b are provided at positions upstream of the flow of the first rib 11a, 12a, 13a and adjacent to the gap g formed between the front end side of the first ribs 11a, 12a, 13a and the opposing surface of the other member. ing. The height of the second ribs 11b, 12b, and 13b is set to a value equal to or higher than the height of the gap g so as to prevent passage of blow-by gas through the gap g. Thereby, the passage of blow-by gas in the gap g is prevented by the first ribs 11a, 12a, 13a and the second ribs 11b, 12b, 13b. As a result, the separation efficiency of the oil component contained in the blow-by gas can be improved. Furthermore, since the surface rigidity of the cylinder head cover 2 and the baffle plate 3 is enhanced by the first ribs 11a, 12a, 13a and the second ribs 11b, 12b, 13b, the silencing effect and impact resistance are improved.

  In the present embodiment, the first ribs 11a, 12a, 13a for detouring and the second ribs 11b, 12b, 13b are provided. Thus, the blow-by gas is detoured in the plane direction of the cylinder head cover 2 in the separator chamber S by the first ribs 11a, 12a, 13a for detouring and the second ribs 11b, 12b, 13b, so that the oil component in the blow-by gas is changed. To be separated. Furthermore, since the first ribs 11a, 12a, 13a for detouring and the second ribs 11b, 12b, 13b prevent the blow-by gas from passing through the gap g, the blow-by gas flow path 20 as designed can be realized, Blow-by gas can be sufficiently diverted.

  In the present embodiment, the first rib 11 a and the second rib 11 b for detouring are arranged to face the introduction port 5. Thereby, the blow-by gas introduced into the separator chamber S from the introduction port 5 collides with the first and second ribs 11a and 11b for detouring, so that the oil component in the blow-by gas is effectively separated. Is done. Further, the bypass first and second ribs 11a and 11b prevent the passage of blow-by gas having a high flow velocity in the gap g.

  Further, in the present embodiment, the second rib 11 b includes an inclined surface 16. As a result, the blow-by gas is guided in the vertical direction away from the gap g by the inclined surface 16 of the second rib 11b. Therefore, it is possible to more reliably prevent the blow-by gas from passing through the gap g.

<Example 2>
Next, a blow-by gas passage structure according to the second embodiment will be described. Note that, in the blow-by gas passage structure according to the second embodiment, the same reference numerals are given to substantially the same components as the blow-by gas passage structure 1 according to the first embodiment, and detailed description thereof is omitted.

(1) Configuration of Blowby Gas Passage Structure As shown in FIGS. 3 and 4, the blowby gas passage structure 1 ′ according to this embodiment includes a separator chamber formed between the cylinder head cover 2 and the baffle plate 3. S is provided. In the baffle plate 3, an oil dropping hole 8 is formed in the vicinity of the discharge port 6 (that is, the PCV valve 7) of the cylinder head cover 2.

  The blow-by gas passage structure 1 ′ includes first bypass ribs 11 a, 12 a, 13 a and second ribs 11 b, 12 b, 13 b, bypass rib 14, shielding first ribs 23 a, and second ribs. 23b. These shielding first ribs 23 a and second ribs 23 b are ribs for blocking the flow of blow-by gas from the oil dropping hole 8 toward the discharge port 6 in the separator chamber S.

  The bypass first rib 23 a is raised from the facing surface 3 a (that is, the bottom surface 3 a) of the baffle plate 3. The first rib 23a is formed in a plate shape whose tip side extends to the vicinity of the facing surface 2a of the cylinder head cover 2 (ie, the ceiling surface 2a). A gap g having a predetermined height interval is formed between the front end side of the first rib 23 a and the facing surface 2 a of the cylinder head cover 2.

  The bypass second rib 23b is provided on the opposed surface 2a of the cylinder head cover 2 on the upstream side of the flow of blow-by gas of the first rib 23a and adjacent to the gap g. The adjacent distance d1 between the first rib 23a and the second rib 23b is about 3 mm. Further, the second rib 23b is formed in a protruding shape so as to cover the gap g. The height of the second rib 23b is set to a value larger than the height of the gap g. That is, the second rib 23b is opposed to the front end side of the first rib 23a in the plane direction of the cylinder head cover 2 so as to overlap in the vertical direction P of the cylinder head cover 2. Further, the first rib 23 a and the second rib 23 b extend in a linear shape that is substantially parallel to each other in the plane direction of the cylinder head cover 2.

(2) Operation and Effect of Blowby Gas Passage Structure According to the blowby gas passage structure 1 ′ of the present embodiment, the operation and effect substantially similar to those of the blowby gas passage structure 1 of the first embodiment are obtained, and also for shielding. Since the first rib 23a and the second rib 23b are provided, the flow of blow-by gas from the oil drain hole 8 toward the discharge port 6 is blocked in the separator chamber S by the shielding first rib 23a and second rib 23b. Moreover, since the passage of the blow-by gas through the gap g is prevented by the shielding first rib 23a and the second rib 23b, the shielding effect of the blow-by gas is enhanced.

  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 said Example 1, 2, although the height of 2nd rib 11b, 12b, 13b, 23b was made into the value larger than the height of the clearance gap g, it is not limited to this, For example, 2nd rib 11b, 12b, The heights 13b and 23b may be substantially the same as the height of the gap g.

  Moreover, in the said Example 1, 2, although the form which provides the inclined surface 16 in the 2nd rib 11b was illustrated, it is not limited to this, For example, the inclined surface 16 is provided in the other 2nd rib 12b, 13b, 23b. You may do it. In the cylinder head cover 2, since the introduction port 5 is an undercut portion, the die cutting direction is oblique, and the inclined surface 16 of the second rib 11b can be easily formed. Further, for example, the inclined surface 16 may not be provided on the second rib 11b.

  In the first and second embodiments, the protruding second ribs 11b and 12b are arranged on the upstream side of the flow of the blow-by gas, and the plate-like first ribs 11a and 12a are arranged on the downstream side. For example, the plate-like second rib may be arranged on the upstream side of the flow of the blow-by gas, and the protrusion-like first rib may be arranged on the downstream side.

  Further, the shape, number and arrangement of the ribs 11a, 11b, 12a, 12b, 13a, 13b, 23a, and 23b in Examples 1 and 2 are appropriately determined according to the oil separation performance, the shape of the separator chamber S, and the like. You can choose. Furthermore, in the present embodiment, the labyrinth type oil separation structure is exemplified, but the present invention is not limited thereto. For example, instead of or in addition to the labyrinth type oil separation structure, a filter type, a centrifugal type, a gravity separation type, etc. The oil separation structure may be adopted.

  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.

  The present invention is widely used as a technique for forming a blow-by gas passage in a separator chamber formed in a cylinder head cover of a vehicle such as a passenger car, a bus, or a truck.

  1, 1 '; blowby gas passage structure, 2; cylinder head cover, 2a; facing surface, 3; baffle plate, 3a; facing surface, 5; introduction port, 6; discharge port, 8; 13a; first rib for detouring, 11b, 12b, 13b; second rib for detouring, 16; inclined surface, 23a; first rib for shielding, 23b; second rib for shielding, g; gap, S ; Separator chamber, P; vertical direction of cylinder head cover.

Claims (6)

A blow-by gas passage provided in a separator chamber formed between a cylinder head cover and a baffle plate joined to the cylinder head cover and constituting a blow-by gas passage introduced into the separator chamber for separation of oil components Structure,
Each of the cylinder head cover and the baffle plate includes a facing surface facing the cylinder head cover in the vertical direction,
A first rib is provided on an opposing surface of one member of the cylinder head cover and the baffle plate, and an opposing surface of the other member is provided upstream of the flow of blow-by gas of the first rib and A second rib is provided at a position adjacent to a gap formed between the tip side of the first rib and the opposing surface of the other member;
The blow-by gas passage structure is characterized in that the height of the second rib is set to a value equal to or higher than the height of the gap so as to prevent the passage of blow-by gas through the gap.   2. The blowby gas passage structure according to claim 1, further comprising: the first rib and the second rib for bypassing the blowby gas so as to bypass the blowby gas in a planar direction of the cylinder head cover.   The blowby gas passage structure according to claim 2, wherein the first rib and the second rib for bypassing are arranged to face an inlet for introducing blowby gas into the separator chamber.   The first rib and the second rib for shielding for blocking the flow of blow-by gas from the oil pit for discharging the oil component separated from the separator chamber to the discharge port for discharging blow-by gas from the separator chamber. The blowby gas passage structure according to any one of claims 1 to 3.   5. The blow-by gas passage structure according to claim 1, wherein the second rib includes an inclined surface that is inclined so as to be separated from the gap in the vertical direction as the first rib is approached. A method for producing a blowby gas passage structure according to any one of claims 1 to 5,
By joining the cylinder head cover and the baffle plate by vibration welding, the second rib is located upstream of the blow-by gas flow of the first rib and between the tip side of the first rib and the other member. A method for producing a blowby gas passage structure, wherein the blowby gas passage structure is disposed at a position adjacent to a gap formed between the opposing surfaces.

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